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US20110272139A1 - System for drilling a wellbore - Google Patents

System for drilling a wellbore Download PDF

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Publication number
US20110272139A1
US20110272139A1 US12/599,818 US59981808A US2011272139A1 US 20110272139 A1 US20110272139 A1 US 20110272139A1 US 59981808 A US59981808 A US 59981808A US 2011272139 A1 US2011272139 A1 US 2011272139A1
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US
United States
Prior art keywords
casing
oil
drill string
lubricating compound
compound includes
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.)
Abandoned
Application number
US12/599,818
Other languages
English (en)
Inventor
Bernardus Johannes Henricus Van Den Brekel
Grigoriy Grinberg
Matthew Martin Shade
Mark Michael SHUSTER
Antonius Leonardus Wubben
Djurre Hans Zijsling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell USA Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Assigned to SHELL OIL COMPANY reassignment SHELL OIL COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VAN DEN BREKEL, BERNARDUS JOHANNES HENRICUS, GRINBERG, GRIGORIY, SHADE, MATTHEW MARTIN, SHUSTER, MARK MICHAEL, WUBBEN, ANTONIUS LEONARDUS MARIA, ZIJSLING, DJURRE HANS
Publication of US20110272139A1 publication Critical patent/US20110272139A1/en
Abandoned 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1007—Wear protectors; Centralising devices, e.g. stabilisers for the internal surface of a pipe, e.g. wear bushings for underwater well-heads
    • 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
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/06—Clay-free compositions
    • C09K8/08—Clay-free compositions containing natural organic compounds, e.g. polysaccharides, or derivatives thereof
    • 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
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/06—Clay-free compositions
    • C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
    • 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
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/14—Clay-containing compositions
    • C09K8/18—Clay-containing compositions characterised by the organic compounds
    • C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
    • 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
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/14—Clay-containing compositions
    • C09K8/18—Clay-containing compositions characterised by the organic compounds
    • C09K8/22—Synthetic organic compounds
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1085—Wear protectors; Blast joints; Hard facing
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/085—Phosphorus oxides, acids or salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/2805—Esters used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/40—Fatty vegetable or animal oils
    • C10M2207/401—Fatty vegetable or animal oils used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/02—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds
    • C10M2219/024—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds of esters, e.g. fats
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure

Definitions

  • the present invention relates to a system for drilling a borehole into an earth formation, comprising a casing arranged in the borehole, and a drill string extending through the interior of the casing to a lower end portion of the borehole, the casing having an inner surface susceptible of wear due to contact with an outer surface of the drill string during drilling of the borehole with the drill string.
  • the drill string is rotated from surface by a rotary table at the drilling rig to deepen the wellbore, whereby the rotating drill string normally is in frictional contact with the inner surface of the casing and the wellbore wall.
  • the accumulated friction force between drill string and casing/wellbore wall increases with increasing depth, tortuosity and inclination of the borehole, thus leading to increased torque at the rotary table.
  • the frictional contact between the drill string and the casing potentially leads to wear of both the drill string and the casing.
  • casing are installed at selected depth intervals of the wellbore, whereby generally the fracture pressure and the pore pressure of the surrounding formation are the determining factors for the length of each such depth interval.
  • each casing is lowered through a previously installed casing and extends from surface to near the lower end of the newly drilled depth interval.
  • subsequent casings necessarily are of stepwise decreasing diameter.
  • the resulting nested casing arrangement implies that each casing normally is in frictional contact with the rotating drill string only for the duration of drilling the next depth interval. Therefore, for such applications, casing wear is normally not a significant problem.
  • EP-1044316-B1 discloses a wellbore system whereby subsequent casings do not extend to surface. Instead, each new wellbore interval is provided with a casing that extends from the lower end of the previous casing to near the newly drilled wellbore interval. Furthermore, each casing is radially expanded in the wellbore after having been lowered to the desired depth so that the wellbore can be drilled at a substantially uniform diameter along the length thereof.
  • the present invention therefore sets out to provide an improved system for drilling a wellbore, which overcomes the problems of the prior art.
  • a system for drilling a borehole into an earth formation comprising a casing arranged in the borehole, a drill string extending through the interior of the casing to a lower end portion of the borehole, and a body of drilling fluid extending into the casing, the casing having an inner surface susceptible of wear due to frictional contact with an outer surface of the drill string during drilling of the borehole with the drill string, wherein the system further comprises means for reducing wear of said inner surface of the casing, said means including at least one of a hardened layer at the inner surface of the casing, a friction-reducing layer at the outer surface of the drill string, and a lubricating compound contained in the body of drilling fluid.
  • each said means are effective to protect the inner surface of the casing against wear, whereby the hardened inner layer of the casing protects the casing against the abrasive action of small particles contained in the drilling fluid, and the friction-reducing layer of the drill string and the lubricating compound in the drilling fluid protect the casing against high friction forces from direct contact with the drill string.
  • the system comprises each of the three wear reducing means, i.e. a hardened layer at the inner surface of the casing, a friction-reducing layer at the outer surface of the drill string, and a lubricating compound contained in the body of drilling fluid.
  • the hardened layer at the inner surface of the casing has a first hardness and the outer surface of the drill string has a second hardness, and wherein said first hardness is larger than said second hardness.
  • the ratio of the first hardness to the second hardness is between 1 and 5.
  • the first hardness has a value of between 150 Hv and 600 Hv.
  • the friction-reducing layer of the drill string comprises poly-tetra-fluor-ethene (PTFE).
  • PTFE poly-tetra-fluor-ethene
  • the friction-reducing layer can be provided in the form of a coating applied to the outer surface of the drill string.
  • the lubricating compound includes between 64.25-90.89 wt % base oil, such as a natural triglyceride oil, fish oil, animal oil, vegetable triglyceride oil, sunflower seed oil, soybean oil, rapeseed oil canola oil, palm nut oil, palm oil, olive oil, rapeseed oil, canola oil, linseed oil, ground nut oil, soybean oil, cottonseed oil, sunflower seed oil, pumpkin seed oil, coconut oil, corn oil, castor oil, walnut oil, natural or synthetic oil, or an ester.
  • base oil such as a natural triglyceride oil, fish oil, animal oil, vegetable triglyceride oil, sunflower seed oil, soybean oil, rapeseed oil canola oil, palm nut oil, palm oil, olive oil, rapeseed oil, canola oil, linseed oil, ground nut oil, soybean oil, cottonseed oil, sunflower seed oil, pumpkin seed oil, coconut oil, corn oil, castor oil,
  • the lubricating compound includes between 0.02-0.05 wt % metal deactivator, for example Triazol or benzotriazol derivatives, such as tolytriazol.
  • metal deactivator for example Triazol or benzotriazol derivatives, such as tolytriazol.
  • the lubricating compound includes between 0.5-3.0 wt % antioxidant, for example aromatic amine antioxidant and/or hindered phenolic antioxidants antioxidants, such as for example, 2,6-bis(tert butyl-4-methylphenol, BHT).
  • antioxidant for example aromatic amine antioxidant and/or hindered phenolic antioxidants antioxidants, such as for example, 2,6-bis(tert butyl-4-methylphenol, BHT).
  • Example commercially available products are: Octylated, Butylated Diphenylamine Antioxidant from Ciba-Geigy Corp (lrganox L 57); 2,6-bis (1,I-dimethylethyl)-4-methyl-Phenol, from PMC, Inc (BHT); and Benzenepropanoic acid, 3,5-bis(1,1-demethylethyl)-4-hydroxy-, thiodi-2,1-ethanediyl ester, from Ciba-Geigy Corp (Irganox 1035).
  • the lubricating compound preferably includes between 4-12 wt % sulfurized natural oils like sulfurized vegetable or animal fatty oils, with natural oils sulfur content 9%-21%, such as for example 13.5%-17.5%.
  • Example commercially available products are: Sulfurized vegetable oils from Rhein Chemie Corporation (Additin RC-2515); and Sulfurized Lard Oil from Ferro Corporation (HSL).
  • the lubricating compound can include between 4-12 wt % phosphate ester, such as phosphoric acid esters with ethoxylated fatty ester (C 12 -C 15 ) alcohols, preferably mixture of phosphoric acid ester with ethoxylated lauryl alcohol and phosphoric acid ester with ethoxylated tridecyl alcohol.
  • phosphate ester such as phosphoric acid esters with ethoxylated fatty ester (C 12 -C 15 ) alcohols, preferably mixture of phosphoric acid ester with ethoxylated lauryl alcohol and phosphoric acid ester with ethoxylated tridecyl alcohol.
  • Example commercially available products are: Phosphoric acid ester with ethoxylated lauryl alcohol and phosphoric acid ester with ethoxylated tridecyl alcohol from Houghton International (Houghton 5653).
  • the lubricating compound can include between 0.4-1.5 wt % phosphoric acid, for example phosphoric acid esters with ethoxylated fatty ester (C 12 -C 15 ) alcohols, preferably mixture of phosphoric acid ester with ethoxylated lauryl alcohol and phosphoric acid ester with ethoxylated tridecyl alcohol.
  • phosphoric acid esters with ethoxylated fatty ester (C 12 -C 15 ) alcohols preferably mixture of phosphoric acid ester with ethoxylated lauryl alcohol and phosphoric acid ester with ethoxylated tridecyl alcohol.
  • Example commercially available products are: Phosphoric acid ester with ethoxylated lauryl alcohol and phosphoric acid ester with ethoxylated tridecyl alcohol from Houghton International (Houghton 5653).
  • the lubricating compound suitably includes between 0.08-1.5 wt % viscosity modifier, such as polyacrylates, polymethacrylates, modifier inylpyrrolidone/methacrylate-copolymers, polyvinylpyrrolidones, polybutanes, olefin-copolymers, styrene/-acrylate-copolymers, polyethers, such as for example, styrene or butadiene-styrene polymer.
  • An example commercially available product is Styrene Hydrocarbon Polymer from Lubrizol Corporation (Lubrizol® 7440S).
  • the lubricating compound suitably includes between 0.1-0.5 wt % pour-point depressant, for example polymethacrylates, alkylated naphthalene depressant derivatives, such as alkyl ester copolymers.
  • pour-point depressant for example polymethacrylates, alkylated naphthalene depressant derivatives, such as alkyl ester copolymers.
  • alkyl ester copolymers such as Lubrizol 6662.
  • the lubricating compound suitably includes between 0.01-0.2 wt % defoamer, such as silicon based antifoam agent.
  • defoamer such as silicon based antifoam agent.
  • An example commercially available product is Silicon based antifoam agent from Ultra Additives (Foam Ban 103).
  • the lubricating compound can include between 0-5 wt % carboxylic acid soaps, for example alkali, alkanolamine, alkyl amine or alkoxylated acid soaps amine salts of mono- or dibasic fatty acids, or mixture thereof.
  • carboxylic acid soaps for example alkali, alkanolamine, alkyl amine or alkoxylated acid soaps amine salts of mono- or dibasic fatty acids, or mixture thereof.
  • An example commercially available product is Soap formed in situ as a product of reaction between Tall Oil Fatty Acids (Sylvatal® D3OLR from Arizona Chemical Co.) and triethanol amine (TEA 99 from Huntsman Corporation).
  • drilling fluids were tested to determine the effect of various lubricating compounds on drill string wear, casing wear, and friction coefficient between drill string and casing.
  • the tested drilling fluids were:
  • fluid 1 water based drilling fluid containing 3 wt % bentonite
  • fluid 2 water based drilling fluid containing 3 wt % barite
  • fluid 3 water based drilling fluid containing 3 wt % Cosmolubric ETL manufactured by Houghton International Inc.
  • fluid 4 water based drilling fluid containing 3 wt % Torque Trim manufactured by Halliburton
  • fluid 5 water based drilling fluid containing 3 wt % Oleon manufactured by Oleon
  • fluid 6 water based drilling fluid containing 3 wt % Anderson manufactured by Leonard Andersen with Mobil Oil composition and PTFE particles
  • fluid 7 water based drilling fluid containing G-seal.
  • the drill string and casing were made of VM 50 steel.
  • coating 1 Victrex coat manufactured by Victrex Peek Coating (Houston Tex., USA); coating 2: Ruby Red manufactured by Kersten Kunststoffofcoating (Netherlands); coating 3: MC coat manufactured by Metal Coating Corp. (Coating (Houston Tex., USA); coating 4: Ceram coat manufactured by Freecom INC. (Coating (Houston Tex., USA); coating 5: Green coat manufactured by Endura Coating (Warren Mich., USA); coating 6: H329 coat manufactured by Hitemco Southwest (Coating (Houston Tex., USA); coating 7: T15 coat manufactured by Hitemco Southwest (Coating (Houston Tex., USA); coating 8: T90 green manufactured by Hitemco Southwest (Coating (Houston Tex., USA).
  • the drill string was made of VM 50 steel, and the casing was made of VM 50 steel.
  • the drilling fluid was water based and included Bentonite and barite as friction reducing compounds.
  • FIG. 1 schematically shows a wellbore drilled with an embodiment of the drilling system of the invention
  • FIG. 2 schematically shows the wellbore of FIG. 1 during continued drilling of the wellbore
  • FIG. 3 schematically shows the wellbore of FIGS. 1 and 2 after drilling is completed.
  • FIG. 1 there is shown a wellbore 1 formed into an earth formation 2 during drilling thereof using a drill string 4 provided with a drill bit 5 .
  • the drill string 4 extends from a drilling rig 6 at the earth surface 8 to the bottom 10 of the wellbore 1 , and is provided with a flow passage (not shown) for pumping drilling fluid from the drilling rig 6 via the flow passage to the drill bit 5 , and from there into the wellbore 1 .
  • An upper portion 12 of the wellbore 1 is provided with a first steel casing 14 having a lower end part 15 of increased diameter to receive a second casing (referred to hereinafter) therein.
  • the first casing 14 is radially expandable and has a hardened inner surface 16 , with hardness larger than the hardness of the outer surface of the drill string 4 .
  • the drill string 4 is provided with an outer layer in the form of a poly-tetra-fluor-ethene (PTFE) coating 18 .
  • PTFE poly-tetra-fluor-ethene
  • the PTFE coating 18 comprises Ruby Red Teflon marketed as Teflon® PFA Coating by Kersten Kunststoffofcoating (Netherlands).
  • FIG. 2 is shown the wellbore 1 after drilling of a further section thereof, whereby a second steel casing 20 is arranged below the first casing 14 in the wellbore 1 .
  • the second casing 20 extends a short distance into the lower end part 15 of the first casing 14 to provide a sealed connection between the two casings 14 , 20 .
  • the second casing 20 is radially expandable and has a hardened inner surface 22 , with hardness larger than the hardness of the outer surface of the drill string 4 .
  • the second casing 20 has a lower end part 24 of increased diameter to receive a third casing (referred to hereinafter) therein.
  • FIG. 3 is shown the wellbore 1 after drilling is completed, whereby the drilling rig 6 has been replaced with a wellhead 26 .
  • a third casing 28 is arranged below the second casing 20 in the wellbore 1 .
  • the third casing 28 extends a short distance into the lower end part 24 of the second casing 20 to provide a sealed connection between the two casings 20 , 28 .
  • the third casing 28 is radially expandable and has a hardened inner surface 30 , with hardness larger than the hardness of the outer surface of the drill string 4 .
  • the drill string is rotated by a rotary table (not shown) at the drilling rig 6 to drill an upper portion of the wellbore 1 , whereafter the drill string is retrieved and the first casing 14 is installed in the upper wellbore portion.
  • the wellbore is drilled deeper whereby the drill string 4 passes through the first casing 14 , and into the new wellbore portion being drilled.
  • a drilling fluid is simultaneously pumped through the flow passage of the drill string 4 into the lower portion of the wellbore 1 .
  • the drilling fluid returns to surface through the annular space 32 formed between the wellbore wall and the casing 14 on one hand, and the drill string 4 on the other hand.
  • the drilling fluid is provided with a lubricating compound in the form of vegetable oil to reduce frictional forces between the rotating drill string 4 , and the casing 14 and wellbore wall.
  • the drill string 4 is retrieved to surface and the second casing 20 is installed in the newly drilled wellbore portion.
  • the second casing 20 extends a short distance into the lower end part 15 of the first casing 14 to provide a sealed connection between the two casings 14 , 20 .
  • a further wellbore portion is drilled whereby the drill string 4 passes through the first casing 14 , the second casing 20 , and into the further wellbore portion being drilled.
  • Drilling fluid is simultaneously circulated downwardly through the drill string 4 , and upwardly through the annular space 32 between the drill string 4 on one hand, and the wellbore wall and the casings 14 , 20 on the other hand.
  • the drilling fluid is provided with said vegetable oil to reduce frictional forces between the rotating drill string 4 , and the casings 14 , 20 and wellbore wall.
  • the drill string 4 is retrieved to surface and the third casing 28 is installed below the second casing 20 in the wellbore 1 .
  • the third casing 28 extends a short distance into the lower end part 24 of the second casing 20 to provide a sealed connection between the two casings 20 , 28 .
  • each casing section 14 , 20 , 28 does not overlap with any other casing section during drilling, so that each casing section 14 , 20 , 28 is exposed to frictional contact with the drill string 4 for prolonged periods of drilling.
  • This is in contrast to conventional wellbore drilling whereby the casings are arranged in a nested arrangement with each subsequent casing extending to surface through a previous casing which thereby no longer is exposed to frictional forces from the drill string during further drilling of the wellbore.
  • a drill string can be used that is transformed into a casing after a selected wellbore portion has been drilled.
  • casing drilling or “liner drilling”.
  • the drill string can be formed as an expandable tubular element that is radially expanded in the newly drilled wellbore portion to form a casing therein.
  • the method of the invention is of particular interest for these “casing drilling” or “liner drilling” applications since the drill string (which is to be transformed into casing) has no radial upsets like in a conventional drill string, which otherwise can be designed to minimise friction between the drill string and the borehole wall/casing, and wear of the casing. Furthermore, it is envisaged that friction reduction between drill string and borehole wall/casing is particularly important for “casing drilling” or “liner drilling” applications because it helps to reduce the rotational torque increase due to the relatively large diameter of the rotating “casing” or “liner” relative to the borehole diameter.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Dispersion Chemistry (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Earth Drilling (AREA)
US12/599,818 2007-05-15 2008-05-15 System for drilling a wellbore Abandoned US20110272139A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07108250 2007-05-15
EP07108250.7 2007-05-15
PCT/EP2008/055930 WO2008138957A2 (fr) 2007-05-15 2008-05-15 Système de forage d'un trou de forage

Publications (1)

Publication Number Publication Date
US20110272139A1 true US20110272139A1 (en) 2011-11-10

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US12/599,818 Abandoned US20110272139A1 (en) 2007-05-15 2008-05-15 System for drilling a wellbore

Country Status (7)

Country Link
US (1) US20110272139A1 (fr)
CN (1) CN101680278A (fr)
AU (1) AU2008250002A1 (fr)
BR (1) BRPI0811595A2 (fr)
CA (1) CA2686386A1 (fr)
GB (1) GB2461471B (fr)
WO (1) WO2008138957A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015076813A1 (fr) * 2013-11-21 2015-05-28 Halliburton Energy Services, Inc. Réduction de frottement et d'usure de tubulaires de fond de trou en utilisant du graphène
US10502010B2 (en) 2017-03-13 2019-12-10 Wen J Whan Vacuum assisted aerated drilling
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CN101680278A (zh) 2010-03-24
WO2008138957A3 (fr) 2009-01-15
GB2461471B (en) 2012-02-15
BRPI0811595A2 (pt) 2014-12-16
WO2008138957A2 (fr) 2008-11-20
CA2686386A1 (fr) 2008-11-20
GB2461471A (en) 2010-01-06
GB0919530D0 (en) 2009-12-23

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