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EP1053384A1 - Nettoyage des debris de forage et dispositif correspondant - Google Patents

Nettoyage des debris de forage et dispositif correspondant

Info

Publication number
EP1053384A1
EP1053384A1 EP99903955A EP99903955A EP1053384A1 EP 1053384 A1 EP1053384 A1 EP 1053384A1 EP 99903955 A EP99903955 A EP 99903955A EP 99903955 A EP99903955 A EP 99903955A EP 1053384 A1 EP1053384 A1 EP 1053384A1
Authority
EP
European Patent Office
Prior art keywords
drill cuttings
contaminants
oil
nonpolar
particulate solids
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.)
Withdrawn
Application number
EP99903955A
Other languages
German (de)
English (en)
Inventor
Inge Brun Henriksen
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.)
Cagniard de la Tour AS (CTour)
Original Assignee
Cagniard de la Tour AS (CTour)
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 Cagniard de la Tour AS (CTour) filed Critical Cagniard de la Tour AS (CTour)
Publication of EP1053384A1 publication Critical patent/EP1053384A1/fr
Withdrawn legal-status Critical Current

Links

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
    • E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
    • E21B21/065—Separating solids from drilling fluids
    • E21B21/066—Separating solids from drilling fluids with further treatment of the solids, e.g. for disposal

Definitions

  • the present invention comprises a process and an apparatus for removing nonpolar organic contaminants including oil from particulate solid wherein said solids is brought in contact with an extracting agent.
  • an extracting agent for removing nonpolar organic contaminants including oil from particulate solid wherein said solids is brought in contact with an extracting agent.
  • natural gas as an extracting agent is also described in the present invention.
  • Oil-based drilling fluids have traditionally been favoured over aqueous based systems because they are more cost-efficient.
  • the resent development in directional drilling techniques has further dictated the need for more efficient environmental friendly drilling fluids.
  • synthetic drilling fluids Following the complete ban against the discharge of oil-based drill cuttings in the early 9CVs, a new generation of synthetic drilling fluids emerged. These fluids were based on alkyl-ester or- ethers and poly-alfa-olefines. They were classified as «non toxic» and were permitted to be discarded overboard.
  • US 4.434.028 relates to a method and apparatus for removing oil and other organic constituents from inorganic-rich mineral solids, particulate drill cuttings.
  • the solids to be treated are transferred into pressure vessel means wherein they are contacted with an extracting agent which is normally a gas such as e.g. dichloro- difluoromethane, propan, carbondioxide, ethane and ethylene.
  • the gas is under condition of pressure and temperature to provide the extracting in a fluidic solvent state for the constituents to be removed.
  • the extracting containing the constituents is withdrawn from the pressure vessel and depressurized and forms a two-phase system.
  • the two-phase system can be separated by distillation into a vapour phase containing the extracting and a liquid phase containing oil and organic constituents.
  • the method described in US 4.434.028 is a very expensive extraction process comprising the use of pure gas components as an extracting agent followed by compression- and to-steps distillation procedures to fully recover the extracting agent which is pure gas components. In order for the process to be eco- nomic feasible, full recovery of the extracting agent (99.7%) is required.
  • the process described in US 4.434.028 is based on using liquid gas (i.e.CO 2 , Propane or Freon) to extract the oil and to fully recycle the gas (99.7%). The proposed process has apparently never been scaled up to an industrial plant .
  • One object is therefore to provide an inventive and cost-effective process for cleaning of oily-drill cuttings and sand to allow overboard discard of the cuttings.
  • the present invention concerning a method of extracting oil from drill cuttings and sand offshore.
  • the method is based upon using natural gas liquid (NGL) as a solvent to extract the oil from the sous.
  • NNL natural gas liquid
  • the present invention reduces the investment and operation costs to a fraction of that which was proposed in US 4.434.028 since NGL is available from the production flw-lines at most oil and gas production facilities. Further, the present process is considerably distinct from other extraction processes in that it is carried out with no «solvent- recovery».
  • One further object with the present invention is a significant saving in chemical costs and utility requirement compared to re-injection or on-shore disposal of drill cuttings.
  • the present invention comprises a process for removing nonpolar organic contaminants including oil from particulate solids, wherein said solids are brought in contact with an extracting agent in which: a) the particulate solids are conveyed into a pressure vessel to which an extracting agent is added in the form of natural gas liquids (NGL), whereby the organic contaminants from the particulate solids are dissolved in the extraction agent to form a single phase solution; b) whereafter said solution containing the extraction agent and nonpolar organic contaminants without any separation is added to a production flow; c) and the clean particulate solids are discarded.
  • NNL natural gas liquids
  • the extracting agent is a condensate collected from a production flow in the form of natural gas liquid.
  • the cleaned particulate solids contains less than 1 % by weight of organic nonpolar contaminants, more preferably less than 0.5% by weight .
  • the particulate solids comprise drill cuttings and sand in the present invention.
  • An apparatus for removing nonpolar organic contaminants from drill cuttings is also described in this invention where said contaminated drill cuttings are contacted with an extractant to form a solution of said extractant and said contaminants, comprising: - means for discarding clean drill cuttings after said contacting;
  • a scope of the invention is also the use of natural gas liquid as an extracting agent for removing organic nonpolar contaminants including oil from particulate solids.
  • the present process comprises the use of condensate (NGL) as a solvent to clean the drill cuttings and sand.
  • NGL condensate
  • Use of natural gas liquid according obtained from the production flow-line of oil and gas producing facilities is also object of the present invention.
  • the NGL is conveyed from one of the production condensate flows at e.g. an oil drilling platform and used as a solvent and subsequently added back to the production mainstream.
  • NGL flow for extracting and subsequently adding the extract into the main production flow is a novel and cost-effective process.
  • the process is carried out without «solvent-recovery» and with minimum utility requirement.
  • Figure 1 shows the experimental set-up for the extraction of drill cuttings with NGL.
  • NGL is conveyed from e.g. a NGL container (1) through a valve (2) and a pump (3), and further trough the pipe 4.
  • the NGL is conveyed through a valve 5 and further pumped to an extracting cell (6) in which the drill cuttings are cleaned.
  • the flow (7) containing NGL and the organic contaminants may optionally be conveyed to a production flow-line.
  • the Figure 2 shows a phase diagram of the available NGL, and figure 3 showes the residual oil versus void volumes of NGL.
  • Table 1 Drill cuttings overview.
  • the two Gullfaks samples look very similar though the one from well 34/10-D4H has bigger particles than the one from 34/10-G-2T2H.
  • the 34/10-D4H sample from a Shetland formation is described as interbedded sands and siltstone.
  • the drill cuttings from Veslefrikk contain mainly sand particles.
  • Figure 1 shows the experimental set-up for the extraction of drill cuttings with NGL.
  • the NGL was pumped through the extraction cell and afterwards passed through a sapphire glass window which enabled visual control of the flow.
  • the oil was collected in a glass bottle after choke valve and weighted.
  • the volume of the whole cell is 737 ml and the volume for the extraction of the drill cuttings 537 ml. All experiments were conducted at 30 bar, 60°C with a NGL with composition corresponding to an average molecular weight of 57.9. Total composition is presented in Table 2 and the corresponding phase-diagram in Figure 2.
  • the pressure and temperature conditions for extraction is determined by the phase diagram of the available NGL. The following conditions must be met:
  • the NGL has to be in liquid state at the pressure and temperature of extraction.
  • the NGL has to be in gaseous state at atmospheric pressure at the extraction temperature.
  • Figure 3 shows the residual oil content (related to the wet sample) on the drill cuttings versus the void volume of NGL injected. It is apparent from Figure 3 that the initial oil concentration of 7.2 wt % remains in the cell until it is flooded with the first void volume of NGL. Upon additional injection of NGL, a reduction of the oil content is evident. It is apparent that each time one void-volume is injected, the concentration is reduced by approximately 50%. The experimental data were consequently compared with the relationship expected from a pure dilution process. The following general equation were used for the dilution-model:
  • Drill cuttings 34/10-D4H 34/10-G-2T2H 30/3-A9A (Gullfaks) (Gullfaks) (Veslefrikk)

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Extraction Or Liquid Replacement (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant d'éliminer dans des solides particulaires les contaminants organiques non polaires qui renferment du pétrole, résultat que l'on obtient en mettant lesdits solides en contact avec un agent d'extraction.
EP99903955A 1998-02-03 1999-02-03 Nettoyage des debris de forage et dispositif correspondant Withdrawn EP1053384A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US7354698P 1998-02-03 1998-02-03
US73546P 1998-02-03
PCT/NO1999/000037 WO1999040292A1 (fr) 1998-02-03 1999-02-03 Nettoyage des debris de forage et dispositif correspondant

Publications (1)

Publication Number Publication Date
EP1053384A1 true EP1053384A1 (fr) 2000-11-22

Family

ID=22114348

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99903955A Withdrawn EP1053384A1 (fr) 1998-02-03 1999-02-03 Nettoyage des debris de forage et dispositif correspondant

Country Status (4)

Country Link
EP (1) EP1053384A1 (fr)
AU (1) AU2442799A (fr)
CA (1) CA2319016A1 (fr)
WO (1) WO1999040292A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050236015A1 (en) * 2004-04-26 2005-10-27 Halliburton Energy Services, Inc. Drill cutting deoiling

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4434028A (en) * 1981-04-17 1984-02-28 Critical Fluid Systems, Inc. Apparatus for removing organic contaminants from inorganic-rich mineral solids
US4885079A (en) * 1986-09-12 1989-12-05 The Standard Oil Company Process for separating organic material from particulate solids
AU644120B2 (en) * 1989-11-28 1993-12-02 Varco I/P Inc. Method and apparatus for cleaning drill cuttings
GB2239470B (en) * 1989-11-28 1993-12-15 Rig Technology Ltd Cleaning of cuttings from drilling operations

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9940292A1 *

Also Published As

Publication number Publication date
CA2319016A1 (fr) 1999-08-12
WO1999040292A1 (fr) 1999-08-12
AU2442799A (en) 1999-08-23

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