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WO2021209149A1 - Procédé et dispositifs de production de fluides aqueux de traitement de puits de forage - Google Patents

Procédé et dispositifs de production de fluides aqueux de traitement de puits de forage Download PDF

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Publication number
WO2021209149A1
WO2021209149A1 PCT/EP2020/060840 EP2020060840W WO2021209149A1 WO 2021209149 A1 WO2021209149 A1 WO 2021209149A1 EP 2020060840 W EP2020060840 W EP 2020060840W WO 2021209149 A1 WO2021209149 A1 WO 2021209149A1
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WO
WIPO (PCT)
Prior art keywords
aqueous
mixing vessel
water
inlet
polymer concentrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2020/060840
Other languages
English (en)
Inventor
Daniel Barrera-Medrano
Markus OSTERMAYR
Ines DEBEAUVAIS DE VASCONCELOS
Jack Tinsley
Brent Busby
Dennis Loesch
Anna-Corina SCHMIDT
Esther Matyka LARYEA
Marco Krueger
Faissal-Ali El-Toufaili
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BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Priority to PCT/EP2020/060840 priority Critical patent/WO2021209149A1/fr
Priority to ARP210101027A priority patent/AR121874A1/es
Publication of WO2021209149A1 publication Critical patent/WO2021209149A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/06—Arrangements for treating drilling fluids outside the borehole
    • E21B21/062—Arrangements for treating drilling fluids outside the borehole by mixing components
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/66—Compositions based on water or polar solvents
    • C09K8/68—Compositions based on water or polar solvents containing organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/84—Compositions based on water or polar solvents
    • C09K8/86—Compositions based on water or polar solvents containing organic compounds
    • C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures

Definitions

  • the present invention relates to a device and a process for making aqueous treatment fluids comprising water-soluble polymers, preferably polyacrylamides, by mixing an aqueous base fluid and an aqueous polymer concentrate comprising 1.0 to 10 wt. % of a water-soluble polymer into a mixing vessel by means of a plurality of inlet tubes or by at least one inlet tube comprising at least one distributor for the aqueous polymer concentrate.
  • Aqueous wellbores treating fluids for treating wellbores are known in the art.
  • Examples comprise fluids for fracturing, acidizing, or enhanced oil recovery. They often comprise water- soluble polymers as component.
  • Such polymers may serve, for example, as thickeners or as friction reducers.
  • Examples of common water-soluble polymers comprise polyacrylamides which may for example by used as thickener and/or as friction reducer for fracturing fluids.
  • aqueous treatment fluids For making aqueous treatment fluids the components thereof are mixed with water or aqueous fluids comprising water. It is known in the art to use polymers, in particular polyacrylamides as powders or as inverse emulsions.
  • Powders may be added as such, however, they are preferably pre-dissolved in water, thereby obtaining a diluted aqueous solution and the diluted aqueous solution used for mixing with the other ingredients.
  • a large number of different processes are known in the art, for example the processes described for example in WO 2008/107492 A1 , WO 2008/081048 A2, WO 2008/071808 A1 , WO 2010/020698 A2, or in US 2013/0292122 A1.
  • FR 3 063230 A1 discloses a two-step process for dissolving polyacrylamide powders: In the first step, a polyacrylamide powder is dissolved yielding a concentrate having a polyacrylamide concentration from 0.3 wt. % to 2 wt. %. In a second step, the solution is diluted with water to a final concentration from 0.025 wt. % to 0.5 wt. % by means of a static mixer.
  • Polyacrylamides may be manufactured by adiabatic polymerization of an aqueous solution comprising acrylamide and optionally further comonomers such as acrylic acid or ATBS, thereby obtaining a solid polymer gel. Such gel may be dried after polymerization, thereby obtaining a polyacrylamide powder. For use in oilfield applications, it needs to be dissolved in aqueous fluids as described above. It is also known in the art, to dissolve the polymer gel in water, thereby obtaining directly an aqueous polyacrylamide solution for use for examples in US 4,605,689. Such a process can be carried out on-site, i.e. at the site where polyacrylamide solutions are needed.
  • WO 2019/081318 A1, WO 2019/081319 A1, WO 2019/081320 A1, WO 2019/081321 A1, WO 2019/081323 A1, WO 2019/081327 A1, and WO 2019/081330 A 1 disclose different methods of manufacturing aqueous polyacrylamide solutions on-site in modular plants.
  • aqueous polyacrylamide concentrate having a concentration from 1.0 to 14.9 wt. %, preferably from 3.1 wt. % to 7 wt. % of polyacrylamides, relating to the total of all components of the aqueous polyacrylamide concentrate.
  • the concentrate is manufactured by adiabatic gel polymerization of a monomer solution comprising 15 to 50 wt. % of acrylamide and optionally further mono-ethylenically unsaturated monomers, followed by comminuting the gel, mixing it with water, thereby obtaining the abovementioned concentrate and transporting it to the location of use.
  • the concentrate may be used as friction reducer for hydraulic fracturing.
  • aqueous fracturing fluids may be obtained by mixing an aqueous base fluid, proppants, the aqueous polyacrylamide concentrate, and optionally further components with each other by means of a customary blender, but it provides no details about such a process.
  • our older application PCT/EP2019/078211 discloses a process of fracturing subterranean formations, wherein the fracturing fluid is prepared by mixing at least an aqueous base fluid, a homogeneous aqueous polyacrylamide concentrate having a concentration of 3.1 to 10 % by weight of polyacrylamides, relating to the total of all components of the homogeneous aqueous polyacrylamide concentrate, and a proppant.
  • blenders for mixing the components of the fracturing fluid. It furthermore mentions, that the concentrates may be metered into such blenders “in the same manner as inverse emulsions or aqueous solutions”.
  • the homogeneous aqueous polyacrylamide concentrates are added into the pipe which transports the aqueous fracturing fluid before or after the blender.
  • Blenders for making fracturing fluids are known in the art.
  • a brief description of a blender system may for example be found in “Flexible Blender Systems Customized for Successful Fracking Operations", John Callihan, Upstream Pumping, Nov. 11, 2015, Cahaba Media Group.
  • blenders pull in water from a water source, for example from tanks, by means of a suction pump, and the water is introduced into a mixing vessel.
  • the mixing vessel typically is open at its upper end and it is often also designated as “mixing tub” or “blender tub”.
  • the mixing vessel mixes the water with proppant that may be delivered to the mixing tub by sand screws. Additional chemicals can also be delivered to the mixing tub.
  • a discharge pump then pulls the mixture from the mixing tub and discharges it to the fracture pump(s) which injects the fracturing fluid into the wellbore at a pressure sufficient to generate fractures or fissures in the formation.
  • a typical mixing tub has a volume of about 6 to 12 barrels (0.95 to 1.9 m 3 ) and the amount of water flowing through the mixing tub may be from 80 to 100 barrels per minute (12.7 m 3 / min - 15.9 m 3 / min).
  • Typical hoses or pipes for transporting water or the fracturing fluid have a diameter of about 4 inches (about 0.1 m).
  • the present invention relates to a device for making an aqueous treatment fluid comprising water-soluble polymers for treating subterranean formations comprising at least
  • a mixing vessel (1) comprising at least o an inlet (7) for an aqueous base fluid, o an inlet (3) for adding treatment fluid additives, o means (2) for mixing the contents of the mixing vessel, and o an outlet (8) for the aqueous fluid,
  • the mixing vessel (1) additionally comprises means for adding an aqueous polymer concentrate comprising 1.0 to 10 wt. % of a water-soluble polymer, relating to the total of all components of the polymer concentrate, selected from the group of o a plurality of inlet tubes (12) for the aqueous polymer concentrate, and o at least one inlet tube (13) for the aqueous polymer concentrate comprising at least one distributor (14) which is a hollow body comprising a plurality of perforations.
  • the present invention relates to a process for making an aqueous treatment fluid comprising water-soluble polymers for treating subterranean formations by means of a device comprising at least
  • a mixing vessel (1) comprising at least o an inlet (7) for an aqueous base fluid, o an inlet (3) for adding treatment fluid additives, o means (2) for mixing the contents of the mixing vessel, and o an outlet (8) for the aqueous fluid,
  • the mixing vessel (1) additionally comprises means for adding an aqueous polymer concentrate comprising 1.0 to 10 wt.
  • % of a water-soluble polymer relating to the total of all components of the polymer concentrate, selected from the group of o a plurality of inlet tubes (12) for the aqueous polymer concentrate, and o at least one inlet tube (13) for the aqueous polymer concentrate comprising at least one distributor (14) which is a hollow body comprising a plurality of perforations, and wherein the process comprises at least the following steps
  • an aqueous treatment fluid for treating subterranean formations which comprises at least one water-soluble polymer.
  • the starting material for the process is an aqueous polymer aqueous polymer concentrate comprising 1.0 to 10 wt. % of a water-soluble polymer, relating to the total of all components of the polymer concentrate which is mixed at least with an aqueous fluid by means of a device as will be described below, thereby obtaining an aqueous treatment fluid.
  • the water-soluble polymers comprise monoethylenically unsaturated, water-soluble monomers, such as for example acrylic acid or salts thereof or acrylamide. It is not necessary that the water-soluble monomers to be used are miscible with water without any gap. In general, the solubility of the water-soluble monomers in water at room temperature should be at least 50 g/l, preferably at least 100 g/l.
  • the water-soluble polymers are polyacrylamides.
  • polyacrylamide as used herein means water-soluble polymers comprising at least 10 %, preferably at least 20 %, and more preferably at least 30 % by weight of acrylamide, wherein the amounts relate to the total amount of all monomers relating to the polymer.
  • Polyacrylamides include homopolymers and copolymers of acrylamide and other monoethylenically unsaturated comonomers. Polyacrylamide copolymers are preferred.
  • water-soluble, monoethylenically unsaturated monomers comprise neutral monomers such as acrylamide, methacrylamide, N-methyl(meth)acrylamide, N,N’- dimethyl(meth)acrylamide, N-methylol(meth)acrylamide or N-vinylpyrrolidone.
  • Further examples comprise anionic monomers, in particular monomers comprising -COOH groups and/or -SO 3 H groups are salts thereof such as acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid or fumaric acid or salts thereof.
  • Examples of monomers comprising -SO 3 H groups or salts thereof include vinylsulfonic acid, allylsulfonic acid, 2- acrylamido-2-methylpropanesulfonic acid (ATBS), 2-methacrylamido-2- methylpropanesulfonic acid, 2-acrylamidobutanesulfonic acid, 3-acrylamido-3- methylbutanesulfonic acid or 2-acrylamido-2,4,4-trimethylpentanesulfonic acid. Preference is given to 2-acrylamido-2-methylpropanesulfonic acid (ATBS) or salts thereof.
  • Preferred monomers comprising acidic groups comprise acrylic acid and/or ATBS or salts thereof.
  • monomers comprise water-soluble, monoethylenically unsaturated monomers comprising cationic groups.
  • associative monomers may be used. Examples of associative monomers have been described for example in WO 2010/133527, WO 2012/069478, WO 2015/086468 or WO 2015/158517.
  • water-soluble monoethylenically unsaturated monomers also water-soluble, ethylenically unsaturated monomers having more than one ethylenic group may be used.
  • Monomers of this kind can be used in special cases in order to achieve easy crosslinking of the polymers.
  • the amount thereof should generally not exceed 2% by weight, preferably 1% by weight and especially 0.5% by weight, based on the sum total of all the monomers. More preferably, the monomers to be used in the present invention are only monoethylenically unsaturated monomers.
  • the specific composition of the polymers may be selected according to the desired use of the polymers.
  • Preferred polymers are polyacrylamides and comprise, besides at least 10 % by weight, preferably at least 20 % by weight and for example at least 30 % by weight of polyacrylamide, one further water-soluble, monoethylenically unsaturated monomer, preferably at least one further monomer selected from the group of acrylic acid or salts thereof, ATBS or salts thereof, or associative monomers.
  • the polyacrylamides comprise from 50 to 95 wt. % of acrylamide and from 5 to 50 wt. % of ATBS and/or acrylic acid or salts thereof.
  • the weight average molecular weight M w of the water-soluble polymer, in particular the water-soluble polyacrylamides is selected by the skilled artisan according to the intended use of the polyacrylamides. For many applications high molecular weights are desirable.
  • a high molecular weight corresponds to a high intrinsic viscosity (IV) of the polyacrylamides.
  • the intrinsic viscosity may be at least 15 deciliter/gram (dL/g).
  • the intrinsic viscosity is from 30 to 45 dl/g.
  • the numbers mentioned relate to the measurement with an automatic Lauda iVisc ® LMV830 equipped with an Ubbelohde capillary tube and automatic injection.
  • an aqueous solution of the polymers to be analyzed was prepared having a concentration of 250 ppm.
  • the pH was adjusted at 7 by means of a buffer and the solution comprised additionally 1 mol /I of NaCI. Further four dilutions were done automatically.
  • the viscosity at five different concentrations was measured at 25 °C.
  • the IV value [dL/g] was determined in usual manner by extrapolating the viscosities to infinite dilution.
  • the error range is about +/- 2 dL/g.
  • the aqueous polymer concentrates to be used in the process according to the present invention comprises at least a water-soluble polymer, preferably a polyacrylamide, more preferably a polyacrylamide copolymer as described above and an aqueous liquid.
  • the aqueous liquid comprises water.
  • water includes any kind of water such as desalinated water, fresh water or water comprising salts, such as brines, sea water, formation water, produced water or mixtures thereof.
  • the aqueous liquid may comprise organic solvents miscible with water, however the amount of water relating to the total of all solvent should be at least 70 % by weight, preferably at least 90 % by weight, more preferably at least 95 % by weight.
  • the aqueous liquid comprises only water as solvent.
  • aqueous polymer concentrates to be used for making aqueous treatment fluids according to the present invention are homogeneous.
  • the term should be understood as “substantially homogeneous”, so minor variations of polymer density or polymer concentration within a concentrate may be possible.
  • polyacrylamide dispersions in oil or water-in-oil emulsions of polyacrylamide are heterogeneous products (which comprise at least to different phases) are not subject of the process according to the present invention.
  • the concentration of the water-soluble polymers, preferably of the polyacrylamides in the aqueous polymer concentrate is from 1 to 10 wt. % relating to the total of all components of the polymer concentrate, in particular from 2 to 10 wt. %, preferably from 2.5 to 10 wt. % or from 2.5 to 8 wt. % and for example from 3.1 to 7 wt. %.
  • the aqueous polymer concentrates typically may be identified as (soft) solids or viscos solutions.
  • the aqueous polymer concentrates are pumpable.
  • the aqueous polymer concentrate preferably has a viscosity of at least 1 ,000 mPas*s, measured at 10 s 1 , for example at least 1,000 mPas*s, preferably at least 5,000 mPas*s, more preferably at least 10,000 mPas*s. As a rule, its viscosity should not exceed 500,000 mPa*s, preferably not 300,000 mPa*s.
  • the viscosity of the aqueous polymer concentrate is from 1,000 mPa*s to 500,000 mPa*s, preferably from 5,000 mPa*s to 300,000 mPa*s, for example from 10,000 mPa*s to 100,000 mPa*s.
  • the aqueous polymer concentrates preferably the aqueous polyacrylamide concentrates to be used for the method according to the present invention basically may be manufactured by any technology.
  • the aqueous polymer concentrates may be obtained by mixing water-soluble polymers as described above with an aqueous liquid.
  • aqueous liquid has already been defined above. Basically, any kind of mixing unit capable of mixing solids with liquids may be used. For example, extruder or kneaders may be used.
  • a kneader may be used for mixing.
  • suitable kneaders are disclosed in WO 2006/034853 A1 and the literature cited therein. Suitable kneaders are also commercially available.
  • the aqueous polymer concentrates may be obtained by adiabatic gel polymerization of an aqueous solution of water-soluble, monoethylenically unsaturated monomers thereby yielding an aqueous polymer gel, preferably an aqueous polyacrylamide gel, followed by comminuting the gel and mixing it with an aqueous liquid.
  • the method of “adiabatic gel polymerization” is well known to the skilled artisan. Details are described for example in WO 2019/081318 A1 and other documents cited in the introduction.
  • the aqueous polymer gel typically has a concentration from 15 % to 50 % by weight of water-soluble polymers, preferably from 20 wt. % to 35 wt.
  • the aqueous polymer gel obtained by adiabatic gel polymerization is comminuted and mixed with an aqueous liquid in a second step thereby obtaining an aqueous polymer concentrate as described above.
  • Comminution and mixing may be followed by a step of homogenization.
  • any kind of comminution means may be used for disintegrating the aqueous polymer gel into smaller particles.
  • suitable means for comminuting aqueous polymer gels include cutting devices such as knives or perforated plates, crushers, kneaders, static mixers or water-jets. Homogenization may be effected by simply allowing to stand a mixture of small gel pieces and aqueous liquid in a suitable vessel.
  • the loop may comprise one or more static mixers.
  • Further examples include tumbling, shaking or any mixing method known to skilled in the art for highly viscous liquids, for example using progressive cavity pumps.
  • the aqueous treatment fluid to be manufactured according to the process according to the present invention comprises at least a water-soluble polymer, preferably a polyacrylamide as described above which is introduced in the process as aqueous polymer concentrate as also described above.
  • aqueous base fluid comprises fresh water, brines, sea water, formation water treated water or mixtures thereof.
  • the salinity of the water may be -for example- from 500 ppm to 300,000 ppm total dissolved solids (TDS), for example from 1,000 ppm to 100,000 ppm.
  • the concentration of the water-soluble polymer, preferably the water-soluble polyacrylamides in the treatment fluid depend on the application of the treatment fluid and may be selected by the skilled artisan. It may range from 20 to 600 ppm, relating to the total of all components of the treatment fluid if the water-soluble polymers, preferably water-soluble polyacrylamides are used as friction reducers in slickwater fracturing operations. For fracturing using viscosified fracturing fluids, or for enhanced oil recovery, the concentration may be for example from 0.05 wt. % to 0.5 wt. %.
  • the aqueous treatment fluid may of course comprise further components.
  • the nature and the amount of such further components depend on the intended use of the aqueous treatment fluid.
  • additional components comprise biocides, corrosion inhibitors, scale inhibitors, iron control agents, or clay control agents.
  • the treatment fluid is a fracturing fluid
  • at least a part of the fracturing fluid comprises a proppant.
  • Proppants are small hard particles which cause that fractures formed in course of the process do not close after removing the pressure. Suitable proppants and suitable amounts thereof are known to the skilled artisan. Examples of proppants include naturally-occurring sand grains, resin- coated sand, sintered bauxite, glass beads, or ultra-lightweight polymer beads.
  • a device for making aqueous treatment fluids comprising water-soluble polymers according to the process according to the present invention a device as will be described in the following is used.
  • One embodiment of a device according to the present invention is schematically shown in figure 1.
  • the device comprises at least one source (4) for the aqueous base fluid.
  • the term “source” is intended to cover any kind of source.
  • a river, a lake or another water reservoir may serve as source (4) for the aqueous base fluid.
  • the aqueous base fluid may be provided in a pipeline to the site of use.
  • the source (4) is a tank.
  • a plurality of sources (4) may be used, for example a plurality of tanks.
  • such tanks (4) are mobile, so that they can be easily relocated, for example from one oil well to another oil well.
  • the tanks may be tank containers, tank trailers or tank trucks. Basically, the tanks may have any shape and size.
  • tanks may be cylindrical.
  • the volume of the tanks is not limited.
  • Mobile tanks as mentioned, may have a volume from 10 m 3 to 100 m 3 , for example from 50 m 3 to 100 m 3 .
  • the tanks may also serve a buffer tanks to ensure an uninterrupted supply with the aqueous base fluid, that is to say they are simultaneously filled from a water source such as a river, a lake or another water reservoir and aqueous base fluid is withdrawn from the tank(s) for use in the process.
  • the device furthermore comprises at least a mixing vessel (1).
  • the mixing vessel may have any shape and size. In certain embodiments, it has a tubular shape. Its volume may by for example be from 0.5 m 3 to 5 m 3 , in particular from 0.75 m 3 to 3 m 3 .
  • the vessel preferably is mounted on a mobile platform, so that it can be easily relocated, for example from one oil well to be treated to another oil well to be treated.
  • the mixing vessel (1) comprises at least an inlet (7) for the aqueous base fluid, an inlet (3) for adding treatment fluid additives, and an outlet (8) for the aqueous treatment fluid. It furthermore, comprises means (2) for mixing the contents of the mixing vessel.
  • the mixing vessel (1) may comprise a plurality of inlets (7) for the aqueous base fluid. As will be shown below, using a plurality of inlets (7) may support mixing.
  • the inlet (3) for treatment fluid additives basically may be any find of inlet.
  • the mixing vessel (1) may of course comprise a plurality of inlets (3). Its kind depends of whether liquid or solid treatment fluid additives are to be added.
  • the mixing vessel may comprise an opening at the upper side into which such additives may be added.
  • Liquid additives may be added be means of pipes or hoses and solid additives may for example by suitable means for dosing solids, such as dosing screws or rocking conveyors.
  • the mixing vessel (1) typically comprises a dosing screw or a plurality of dosing screws, for example 3 dosing screws to add the proppants to the aqueous base fluid through an inlet (3) at the upper side of the mixing vessel (1).
  • Mixing means (2) may be any kind of means suitable for mixing the contents of the mixing vessel.
  • the inlet(s) (7) for the aqueous base fluid itself function as mixing means (2).
  • the mixing vessel (1) preferably comprises a plurality of inlets (7).
  • the stream aqueous base fluid is introduced into the mixing vessel (1) through the inlet(s) (7) at a velocity capable of creating turbulences in the mixing vessel (1) which serve to mix the contents of the mixing vessel (1).
  • the inlet(s)(7) may be connected with orifices.
  • the mixing vessel (1) may be equipped with a stirrer (2) as indicated in figure 1.
  • both embodiments may be combined, i.e. the contents of the mixing vessel (1) is mixed by means of introducing the aqueous base fluid and by means of an additional stirrer.
  • the transfer of the aqueous base fluid from the source(s) (4) to the mixing vessel (1) is effected by means of a suction pump (6), whose inlet side is connected with the source(s) (4) for the aqueous fluid by at least one input tube (5), and whose pressure side is connected with the inlet (7).
  • the device comprises a plurality of input tubes (5) which are connected with the inlet side of the suction pump (6).
  • the other end of the input tubes are connected with a number of sources (4), in particular a number of tanks.
  • a number of sources (4) in particular a number of tanks.
  • tube as used throughout this invention, encompasses rigid tubes such as pipes or pipelines as well as flexible tubes, such as for example hoses or flexible metal tubes.
  • a tube may of course comprise both, rigid and flexible sections.
  • the diameter of the tubes may be for example from 5 cm to 15 cm. Tubes used in oilfield applications often have a diameter of about 10.2 cm (4 inches).
  • Removing the contents of the mixing vessel is effected by means of a discharge pump (10), whose inlet side is connected with the outlet (8) of the mixing vessel (1) by a discharge tube (9) and whose pressure side is connected with a product tube (12) which transfers the aqueous treatment fluid to a device for further handling or use.
  • the product tube (12) may for example transfer the aqueous treatment fluid to high pressure pumps for injecting the aqueous treatment fluid into a subterranean formation.
  • the mixing vessel (1) additionally comprises means for adding an aqueous polymer concentrate comprising 1.0 to 10 wt. % of a water-soluble polymer, relating to the total of all components of the polymer concentrate. Details of such a concentrate have already been described above.
  • the means for adding the aqueous polymer concentrate are selected from the group of o a plurality of inlet tubes (12) for the aqueous polymer concentrate, and o at least one inlet tube (13) comprising at least one distributor (14) for the aqueous polymer concentrate which is a hollow body comprising a plurality of perforations.
  • the aqueous polymer concentrate may be stored in a suitable container, for example a tank, tank container, tank trailer or tank truck for use in the process according to the present invention. From the container it may be provided to the inlet tubes (12) or the at least one inlet tube (13) by means of a pump.
  • a suitable container for example a tank, tank container, tank trailer or tank truck for use in the process according to the present invention. From the container it may be provided to the inlet tubes (12) or the at least one inlet tube (13) by means of a pump.
  • the aqueous polymer concentrate is added into the mixing vessel (1) through a plurality of inlet tubes (12) for the aqueous polymer concentrate.
  • Such an embodiment has the advantage, that the total amount of aqueous polymer concentrate to be added is distributed over a larger number of inlets, so that the diameter of the inlets (12) can be reduced. Strings of aqueous polymer concentrates having a lower diameter are easier to dissolve in the aqueous base fluid than strings having a larger diameter.
  • the number of inlets may be selected by the skilled artisan according to his/her needs.
  • the number of inlets (12) may be for example from 2 to 20 or from 4 to 8.
  • the diameter of the inlet tubes (12) preferably should not exceed about 2.54 cm (one inch), although the invention is not restricted to this number. In embodiments of the invention, the diameter of the inlet tubes is limited to not more than about 1.3 cm (0.5 inch) or to not more than about 0.65 cm (0.25 inch). If the mixing vessel has openings at its upper side as describes above, the input tubes (12) may be lead through the opening(s). Of course, they may also be lead through the wall of the mixing vessel (1) at another location.
  • the input tubes (12) should be arranged in such a manner, that the concentrate is introduced at different locations in the mixing vessel, for example in a circle like manner.
  • the tubes may be arranged above the surface of the aqueous mixture in the mixing vessel (1) and/or they may be submerged into the aqueous mixture in the mixing vessel (1).
  • the mixing vessel (1) comprises at least one inlet tube (13) comprising at least one distributor (14) for the aqueous polymer concentrate which is a hollow body comprising a plurality of perforations.
  • the mixing vessel may comprise two or more inlet tubes (13) each of them comprising at least one distributor.
  • the hollow body may be for example a hollow cylinder comprising perforations in the lateral area.
  • the hollow body is a flat body and the perforations preferably are located at its lower surface (similar like a shower head).
  • the perforations preferably may be circular, but of course also other shapes are possible.
  • the diameter and the number of perforations may be selected by the skilled artisan according to his/her needs.
  • the diameter of the perforations may for example be from 1 mm to 10 mm, preferably from 1 mm to 5 mm and for example from 1.5 mm to 3 mm.
  • the term “diameter” refers to the longest dimension.
  • the number of perforations may be for example from 10 to
  • the aqueous polymer concentrate is introduced through the at least one inlet (13) into the distributor and pressed through its perforations.
  • the distributor (14) may be arranged above the surface of the aqueous mixture in the mixing vessel (1). In such a case, the formed strings of aqueous polymer concentrate drop into the aqueous mixture.
  • the distributor (14) is submerged into the aqueous mixture in the mixing vessel (1), i.e. the aqueous mixture circulates around the distributor (14) and the formed strings of aqueous polymer concentrate are taken away with the aqueous mixture in the mixing vessel (1).
  • a device as described above is used.
  • the process comprises at least the process steps (I) to (III).
  • a stream of the aqueous base fluid is pumped continuously from the source(s) (4) preferably the tank(s), through the input tube(s) (5) and the inlet (7) into the mixing vessel (1) by means of the suction pump (6).
  • a stream of an aqueous polymer concentrate comprising 1.0 to 10 wt. % of a water-soluble polymer, relating to the total of all components of the polymer concentrate, is continuously added to the aqueous base fluid in the mixing vessel (1) by the means for adding the polymer concentrate as described above, and the obtained mixture is mixed by means of the mixing means (2), for example by a stirrer, thereby obtaining an aqueous treatment fluid.
  • the polymers are water-soluble they start to dissolve once the aqueous polymer concentrates are in contact with the aqueous base fluid. If not already complete, dissolution may be continue in course of further downstream processing of the mixture, for example in course of passing through the discharge pump (10).
  • the aqueous treatment fluids are aqueous fracturing fluids in course of step (III) proppants are added into the mixing vessel (1) at least to a part of the aqueous fracturing fluid.
  • step (III) a stream of the aqueous treatment fluid is continuously removed from the mixing vessel (1) by means of the discharge pump (10) through the outlet (8) and the discharge tube (9) and transferred into the product tube (11).
  • the amount of aqueous base fluid entered into the mixing vessel (1) is selected by the skilled artisan according to his/her needs. It may be for example from 10 to 20 m 3 /min without wishing the invention to be limited to these numbers.
  • the aqueous treatment fluid is transferred to the location of further use, for example to a high-pressure pump for injecting the aqueous treatment fluid into a subterranean formation.
  • the present invention relates to a process for treating a subterranean formation penetrated by at least a wellbore by preparing an aqueous treatment fluid comprising water-soluble polymers and injecting it into the wellbore, and wherein the aqueous treatment fluid is prepared by a process as described above.
  • said process is a process of fracturing subterranean formations.
  • the aqueous treatment fluid is injected into the wellbore at a rate and pressure sufficient to penetrate into the formation, and to initiate or extend fractures in the formation.
  • At least a part of the aqueous treatment fluid injected additionally comprises a proppant.
  • the proppant is added to mixing vessel as described above.
  • the water-soluble polymers in particular the aqueous polyacrylamides may serve for different purposes.
  • the water-soluble polymers serve as friction reducers for reducing pressure losses cause by turbulences.
  • the concentration of the water-soluble polymers, in particular the polyacrylamides may range from 20 to 600 ppm, relating to the total of all components of the treatment fluid except the proppants.
  • the concentration is higher and may be for example from 0.05 wt. % to 0.5 wt. %.
  • the process for treating subterranean formations is a process of enhanced oil recovery.
  • the subterranean formation comprises at least one injection wellbore and at least one production wellbore.
  • the aqueous treatment fluid is injected into the injection wellbore(s) are flows in the formation towards the production wellbores, thereby mobilizing crude oil which can be recovered from the production wellbore(s).
  • Step 1 The manufacture of the aqueous polymer concentrate in the following is illustrated by the lab procedure. Larger amounts can be manufactured in analogously in larger plants. Step 1 :
  • a 5 L beaker with magnetic stirrer, pH meter and thermometer was filled with 1600 g of distilled water, 702.04 g of sodium acrylate (35% by weight in water), and 1071.69 g of acrylamide (52% by weight in water). Then 10.5 g of diethylenetriaminepentaacetic acid pentasodium salt (Trilon C; 5% by weight in water), and 4 g of the stabilizer sodium 2- m e rca pto be nzothi azole (Na-MBT; 50% by weight in water) were added.
  • Trilon C diethylenetriaminepentaacetic acid pentasodium salt
  • Na-MBT stabilizer sodium 2- m e rca pto be nzothi azole
  • the monomer solution was adjusted to a temperature of approx. -3 °C.
  • the solution was transferred to a Dewar vessel, the temperature sensor for the temperature recording was inserted, and the flask was purged with nitrogen for 45 minutes.
  • the polymerization was initiated at 0 °C with 21 g of a 10% aqueous solution of 2,2‘-azobis(2-methylpropionamidine) dihydrochloride (Wako V-50; 10h /2 in water 56°C), 1.75 g of f-butyl hydroperoxide (1% by weight in water) and 1.05 g of a 1% sodium sulfite solution. With the onset of the polymerization, the temperature rose to 54.6 °C within about 63 min. A solid polymer gel block was obtained.
  • the gel block was incubated 4 hours at 60 °C. Then, the block was cut vertically into two pieces. One part was sealed in a plastic bag for use in step 2. The other part was kept for comparative example 2.
  • the aqueous polyacrylamide gel obtained in course of step 1 was first chopped to small particles ranging in size from 2 to 5 mm. The chopped particles were then dispersed into a 600 ml beaker containing the desired amount of distilled water. A small amount of a water- soluble, blue dye was added in order to obtain a blue concentrate. Such a dyed concentrate allows better monitoring of the process of dissolution. The gel particles were added while mixing via an overhead mixer with a 75 mm diameter half-moon propeller. Finally, a homogeneous polymer concentrate was obtained.
  • Friction Loop Apparatus For the tests, several samples having a polymer concentration from 2.7 to 3.3 wt. % of polymers relating to the total of all components of the polymer concentrate were used. Friction Loop Apparatus
  • the friction reduction performance of the friction reducing agent was assessed using a Chandler model M6500 Mini-Loop which circulates fluid through a section of known diameter pipe to determine the effectiveness and longevity of a friction reducing agent added to a test fluid. Fluid in the loop flows from a ⁇ 11 I ( ⁇ 3 gallon) reservoir through a pump and a ⁇ 50 cm (2 feet) long section of pipe before returning to the reservoir to be recirculated. Pressure drop is measured over this section of pipe.
  • the blender consists of three primary elements: a suction pump, a mixing tub having a volume of about 12 barrels (1.9 m 3 ) and a discharge pump.
  • the suction pump draws in water and feeds it to the tub.
  • the tub a vessel which has openings at the upper side
  • water, proppants and further chemical additives are mixed.
  • the discharge pump carries the mixture to high pressure pumps capable of the pressures and rates that enable hydraulic fracturing.
  • Conventional friction reducers such as inverse emulsions of polyacrylamides or aqueous polyacrylamide solutions obtained by dissolution of polyacrylamide powders are usually added by means of a tube, such as a hose, having for example a diameter of about 2.54 cm (1 inch) through the opening at the upper side of the tub.
  • Water is introduced into the tub by a plurality of inlets for water thereby causing the water in the tub to rotate clockwise.
  • the tub comprises a stirrer which rotates counterclockwise.
  • the tub furthermore comprises three screw conveyors for adding proppants into the tub through the opening at the upper side of the tub. For the present tests no proppant is added, in order to better monitor the dissolution of the aqueous polyacrylamide concentrate.
  • a sampling valve is attached to the discharge lines to take samples.
  • the discharge pump is connected with tanks to store the manufactured fluid.
  • Water for use in the process is stored in a plurality of water tanks, each having a volume of about 500 barrels (about 79.5 m 3 ).
  • the blender comprises a plurality of connections for water, which are connected with the water tanks via 4” (10.2 cm) hoses.
  • Water was introduced into the mixing tub at a flow rate of 80 barrels per minute (12.7 m 3 / min).
  • the aqueous polymer concentrate was introduced into the mixer a rate of about 5 gallons per minute (gpm) (0.0189 m 3 / min) or at a higher rate of about 25 gpm (0.0946 m 3 /min).
  • the exact numbers for each of the tests will be shown in table 1.
  • the methods of adding the aqueous polyacrylamide concentrates will be explained below. Keeping the abovementioned numbers in mind, the average residence time of the mixture in the tub is short, namely only about 9 s.
  • aqueous polymer concentrate was added into the tub through the opening at the upper side of the tub by means of an inlet tube which was connected with a distributor. 3 different constructions were used:
  • a tube comprising 11 holes in its lateral surface 8 holes of 0.75“(1 .92 cm) + 3 holes of 0.625“ (1.6 cm).
  • a flat hollow body comprising 600 holes of 0.25 inches (0.64 cm) (“shower like”).
  • a tube comprising 1500 holes of 0.060 inches ( ⁇ 1 ,5 mm) in its lateral surface.
  • the aqueous polymer concentrate was introduced through the opening at the upper side of the tub by means of a 2-inch (5.16 cm) hose, i.e. through just one single inlet.
  • the hose did not immerse into the aqueous mixture in the tub but ended in the head space above the mixture.

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Abstract

L'invention concerne un dispositif et un procédé de production de fluides de traitement aqueux comprenant des polymères solubles dans l'eau, de préférence des polyacrylamides, par mélange d'un fluide de base aqueux et d'un concentré de polymère aqueux comprenant de 1,0 à 10 % en poids d'un polymère soluble dans l'eau dans une cuve de mélange au moyen d'une pluralité de tubes d'entrée ou d'au moins un tube d'entrée comprenant au moins un distributeur du concentré de polymère aqueux.
PCT/EP2020/060840 2020-04-17 2020-04-17 Procédé et dispositifs de production de fluides aqueux de traitement de puits de forage Ceased WO2021209149A1 (fr)

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ARP210101027A AR121874A1 (es) 2020-04-17 2021-04-16 Método para elaborar fluidos acuosos para el tratamiento de pozos

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