EG21132A - Drilling fluid loss prevention and lubrication additive - Google Patents

Drilling fluid loss prevention and lubrication additive

Info

Publication number
EG21132A
EG21132A EG107496A EG107496A EG21132A EG 21132 A EG21132 A EG 21132A EG 107496 A EG107496 A EG 107496A EG 107496 A EG107496 A EG 107496A EG 21132 A EG21132 A EG 21132A
Authority
EG
Egypt
Prior art keywords
drilling fluid
fluid loss
loss prevention
lubrication additive
lubrication
Prior art date
Application number
EG107496A
Other languages
English (en)
Original Assignee
Super Graphite Co
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 Super Graphite Co filed Critical Super Graphite Co
Application granted granted Critical
Publication of EG21132A publication Critical patent/EG21132A/xx

Links

Classifications

    • 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
    • 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
    • C09K8/16—Clay-containing compositions characterised by the inorganic compounds other than clay
    • 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
    • C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
    • 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
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/5045—Compositions based on water or polar solvents containing inorganic 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/003—Means for stopping loss of drilling fluid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S507/00—Earth boring, well treating, and oil field chemistry
    • Y10S507/906—Solid inorganic additive in defined physical form
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S507/00—Earth boring, well treating, and oil field chemistry
    • Y10S507/91—Earth boring fluid devoid of discrete aqueous phase

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Mining & Mineral Resources (AREA)
  • Dispersion Chemistry (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Lubricants (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EG107496A 1995-12-15 1996-12-04 Drilling fluid loss prevention and lubrication additive EG21132A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US865395P 1995-12-15 1995-12-15

Publications (1)

Publication Number Publication Date
EG21132A true EG21132A (en) 2000-11-29

Family

ID=21732888

Family Applications (1)

Application Number Title Priority Date Filing Date
EG107496A EG21132A (en) 1995-12-15 1996-12-04 Drilling fluid loss prevention and lubrication additive

Country Status (14)

Country Link
US (1) US5826669A (fr)
EP (1) EP0866842B1 (fr)
AR (1) AR004370A1 (fr)
AU (1) AU1410297A (fr)
CA (1) CA2240290C (fr)
CO (1) CO4600753A1 (fr)
DE (1) DE69632831T2 (fr)
DK (1) DK0866842T3 (fr)
DZ (1) DZ2143A1 (fr)
EA (1) EA000357B1 (fr)
EG (1) EG21132A (fr)
NO (1) NO314591B2 (fr)
SA (1) SA97170710B1 (fr)
WO (1) WO1997022677A1 (fr)

Families Citing this family (83)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7267291B2 (en) * 1996-07-24 2007-09-11 M-I Llc Additive for increasing the density of an oil-based fluid and fluid comprising such additive
US6786153B2 (en) * 2002-09-19 2004-09-07 Interflex Laser Engravers, Llc Printing rolls having wear indicators and methods for determining wear of printing and anilox rolls and sleeves
US20030203822A1 (en) * 1996-07-24 2003-10-30 Bradbury Andrew J. Additive for increasing the density of a fluid for casing annulus pressure control
GB2315505B (en) * 1996-07-24 1998-07-22 Sofitech Nv An additive for increasing the density of a fluid and fluid comprising such additve
US6152227A (en) * 1997-10-24 2000-11-28 Baroid Technology, Inc. Drilling and cementing through shallow waterflows
CA2241621A1 (fr) * 1998-06-26 1999-12-26 National Silicates Ltd. Procede de lubrification pour les fluides de forage de silicate
US6849581B1 (en) 1999-03-30 2005-02-01 Bj Services Company Gelled hydrocarbon compositions and methods for use thereof
DE19937920A1 (de) * 1999-08-11 2001-03-01 Flowtex Technologie Gmbh & Co Verfahren und Vorrichtung zum grabenlosen Verlegen von Fremdstromanoden für den kathodischen Korrosionsschutz
CH710862B1 (de) 1999-11-26 2016-09-15 Imerys Graphite & Carbon Switzerland Sa Verfahren zur Herstellung von Graphitpulvern mit erhöhter Schüttdichte.
US6806232B1 (en) 2001-05-31 2004-10-19 Steve Cart Composition of drilling fluids comprising ground elastomeric crumb rubber material and a method of decreasing seepage and whole mud loss using such composition
US7066285B2 (en) * 2002-01-16 2006-06-27 Halliburton Energy Services, Inc. Method and composition for preventing or treating lost circulation
US6821931B2 (en) * 2002-03-05 2004-11-23 Alpine Mud Products Corporation Water-based drilling fluid additive containing talc and carrier
US6861392B2 (en) * 2002-03-26 2005-03-01 Halliburton Energy Services, Inc. Compositions for restoring lost circulation
US6739414B2 (en) * 2002-04-30 2004-05-25 Masi Technologies, L.L.C. Compositions and methods for sealing formations
US7060660B2 (en) * 2002-07-17 2006-06-13 Alpine Mud Products Corp Drilling fluid additive system containing talc and graphite
US7056867B2 (en) * 2002-07-17 2006-06-06 Alpine Mud Products Corp Drilling fluid additive system containing graphite and carrier
US6889780B2 (en) 2002-12-31 2005-05-10 Halliburton Energy Services, Inc. Method for drilling depleted sands with minimal drilling fluid loss
US20040171499A1 (en) * 2003-01-24 2004-09-02 Halliburton Energy Services, Inc. Cement compositions with improved mechanical properties and methods of cementing in a subterranean formation
US7482309B2 (en) * 2003-11-24 2009-01-27 Halliburton Energy Services, Inc. Methods of drilling wellbores using variable density fluids comprising coated elastic particles
US7543642B2 (en) * 2003-01-24 2009-06-09 Halliburton Energy Services, Inc. Cement compositions containing flexible, compressible beads and methods of cementing in subterranean formations
EP1892278A1 (fr) * 2003-04-07 2008-02-27 Baker Hughes Incorporated Fluides de forage comprenant des particules de graphite dimensionnées
US7977281B2 (en) * 2003-04-07 2011-07-12 Baker Hughes Incorporated Methods for minimizing the amount of graphite particles used during drilling operations
US20060122070A1 (en) * 2003-04-07 2006-06-08 Baker Hughes Incorporated Drilling fluid systems comprising sized graphite particles
US7087555B2 (en) * 2003-04-07 2006-08-08 Baker Hughes Incorporated Drilling fluids comprising sized graphite particles
US7376148B1 (en) * 2004-01-26 2008-05-20 Cisco Technology, Inc. Method and apparatus for improving voice quality in a packet based network
US9206084B2 (en) 2004-01-29 2015-12-08 Halliburton Energy Services, Inc. Composition and method for dissipating heat underground
US7452417B2 (en) * 2004-01-29 2008-11-18 Halliburton Energy Services, Inc. Downhole servicing compositions having high thermal conductivities and methods of using the same
US20050205834A1 (en) * 2004-01-29 2005-09-22 Matula Gary W Composition and method for dissipating heat underground
US7067004B2 (en) * 2004-01-29 2006-06-27 Halliburton Energy Services, Inc. Grout compositions having high thermal conductivities and methods of using the same
US7607483B2 (en) * 2004-04-19 2009-10-27 Halliburton Energy Services, Inc. Sealant compositions comprising colloidally stabilized latex and methods of using the same
EP1913111B1 (fr) * 2004-06-03 2012-12-19 M-I L.L.C. Utilisation de granules baryte calibres comme alourdissant pour les fluides de forage
WO2007145731A2 (fr) 2006-06-07 2007-12-21 Exxonmobil Upstream Research Company Objets compressibles destinés à être combinés à un fluide de forage pour former une boue de forage à densité variable
WO2007145734A2 (fr) 2006-06-07 2007-12-21 Exxonmobil Upstream Research Company Objets compressibles à garniture partielle en mousse combinés à un fluide de forage pour former une boue de forage à densité variable
US8088716B2 (en) 2004-06-17 2012-01-03 Exxonmobil Upstream Research Company Compressible objects having a predetermined internal pressure combined with a drilling fluid to form a variable density drilling mud
US7201228B2 (en) * 2004-08-30 2007-04-10 Halliburton Energy Services, Inc. Freer flowing liquid-solid suspensions and methods of use in subterranean formations
GB2419146B (en) 2004-10-14 2007-03-28 Mi Llc Lost circulation additive for drilling fluids
US7284611B2 (en) * 2004-11-05 2007-10-23 Halliburton Energy Services, Inc. Methods and compositions for controlling lost circulation in subterranean operations
US20070111900A1 (en) * 2005-11-11 2007-05-17 Reddy B R Sealant compositions comprising solid latex
US20070111901A1 (en) * 2005-11-11 2007-05-17 Reddy B R Method of servicing a wellbore with a sealant composition comprising solid latex
US7488705B2 (en) * 2004-12-08 2009-02-10 Halliburton Energy Services, Inc. Oilwell sealant compositions comprising alkali swellable latex
EP1853685A4 (fr) * 2005-02-22 2011-11-30 Mi Llc Additif pour reduire le couple d'un train de forage
EP1858694A4 (fr) * 2005-02-25 2012-04-04 Superior Graphite Co Revetement de graphite pour materiaux particulaires
US7264053B2 (en) * 2005-03-24 2007-09-04 Halliburton Energy Services, Inc. Methods of using wellbore servicing fluids comprising resilient material
US20060217270A1 (en) * 2005-03-24 2006-09-28 Halliburton Energy Services, Inc. Wellbore servicing fluids comprising resilient material
US7501019B2 (en) * 2005-03-31 2009-03-10 Chevron U.S.A., Inc. Granular solid wax particles
US7629297B2 (en) * 2005-04-26 2009-12-08 Mano Shaarpour Lost circulation composition
US7913757B2 (en) * 2005-09-16 2011-03-29 Halliburton Energy Services. Inc. Methods of formulating a cement composition
US8132623B2 (en) * 2006-01-23 2012-03-13 Halliburton Energy Services Inc. Methods of using lost circulation compositions
US7776797B2 (en) * 2006-01-23 2010-08-17 Halliburton Energy Services, Inc. Lost circulation compositions
US7741247B2 (en) * 2006-02-10 2010-06-22 Ling Wang Methods and compositions for sealing fractures, voids, and pores of subterranean rock formations
EP2035651A4 (fr) 2006-06-07 2009-08-05 Exxonmobil Upstream Res Co Procédé de fabrication d'objets compressibles pour boue de forage à densité variable
US20080060811A1 (en) * 2006-09-13 2008-03-13 Halliburton Energy Services, Inc. Method to control the physical interface between two or more fluids
GB2461471B (en) * 2007-05-15 2012-02-15 Shell Int Research System for drilling a wellbore
GB0711621D0 (en) * 2007-06-18 2007-07-25 3M Innovative Properties Co Additive to reduce fluid loss for drilling fluids
US20090075847A1 (en) * 2007-09-14 2009-03-19 Wawrzos Frank A Drilling fluid lubricant and method of use
US8043997B2 (en) * 2008-02-29 2011-10-25 Halliburton Energy Services Inc. Lost circulation material formulation and method of use
BRPI0918009A2 (pt) 2008-08-12 2017-06-27 Board Of Supervisors Of Lousiana State Univ And Agricultural And Mechanical College misturas de fibra termoplástica celulósica como materais de perda de circulação
DE102008052417A1 (de) 2008-10-21 2010-04-22 Sasse, Heiko, Dipl.-Ing. Geschlossenes Sonden-System
US20100212892A1 (en) * 2009-02-26 2010-08-26 Halliburton Energy Services, Inc. Methods of formulating a cement composition
US7792250B1 (en) 2009-04-30 2010-09-07 Halliburton Energy Services Inc. Method of selecting a wellbore cement having desirable characteristics
US8530393B2 (en) 2011-04-15 2013-09-10 Halliburton Energy Services, Inc. Methods to characterize fracture plugging efficiency for drilling fluids
US8887806B2 (en) 2011-05-26 2014-11-18 Halliburton Energy Services, Inc. Method for quantifying cement blend components
WO2013116072A1 (fr) 2012-02-02 2013-08-08 Board Of Supervisors Of Louisiana State University And Agricultural And Mechanical College Réalisation de mélanges de fibres plastiques/inorganiques utilisés comme des matériaux de circulation perdue
CA2768538A1 (fr) * 2012-02-16 2013-08-16 Shannon Keith Latimer Procede et appareil de distribution de materiau de remplissage
WO2014011071A1 (fr) * 2012-07-09 2014-01-16 Schlumberger Canada Limited Procédé d'entretien de puits souterrains
US9388333B2 (en) 2012-07-11 2016-07-12 Halliburton Energy Services, Inc. Methods relating to designing wellbore strengthening fluids
US8999898B2 (en) 2013-03-15 2015-04-07 Superior Graphite Co. Drilling fluid additive for loss circulation and wellbore strengthening
US9688901B2 (en) * 2013-07-05 2017-06-27 James Blair Fontenot Lost circulation drilling fluids comprising elastomeric rubber particles and a method for decreasing whole mud loss using such composition
CN103571441B (zh) * 2013-10-11 2017-03-15 四川康克石油科技有限公司 一种钻井液用抗磨减阻剂及其制备方法
CN103710015B (zh) * 2013-12-25 2016-08-17 四川宝麟新材料科技有限公司 一种油气田增产用乳液型减阻剂及其制备方法
US9458703B2 (en) 2013-12-26 2016-10-04 Superior Graphite Co. Compressible carbonaceous particulate material and method of making same
US9637674B2 (en) * 2014-07-21 2017-05-02 Baker Hughes Incorporated Electrically conductive oil-based fluids
MX2017006919A (es) * 2014-12-11 2017-08-16 Halliburton Energy Services Inc Materiales flexibles a base de carbono como materiales contra la perdida de circulacion y metodos relacionados.
WO2016164399A1 (fr) 2015-04-06 2016-10-13 Superior Graphite Co. Composition de ciment comprenant une fraction de carbone compressible
WO2016175774A1 (fr) 2015-04-29 2016-11-03 Halliburton Energy Services, Inc. Coulis destiné à une utilisation dans une boucle de puits géothermique
US20160326423A1 (en) * 2015-05-04 2016-11-10 Baker Hughes Incorporated Downhole fluid compositions and methods of using carbon black particles
US10190388B2 (en) 2015-10-15 2019-01-29 Halliburton Energy Services, Inc. Diverter fluid diverter fluid
CN105623631B (zh) * 2016-02-20 2018-05-04 西南石油大学 适用于深部地层、超深地层井漏的抗高温桥接堵漏剂
US11932808B2 (en) 2018-06-28 2024-03-19 Halliburton Energy Services, Inc. Calcium carbonate/polymer particulate additives for use in subterranean operations
US11319760B2 (en) 2019-12-18 2022-05-03 Saudi Arabian Oil Company Swellable lost circulation material and methods of manufacturing and using the same
US12037534B2 (en) 2021-12-21 2024-07-16 Halliburton Energy Services, Inc. Reclaimed carbon black drilling fluid additive
WO2023141379A1 (fr) * 2022-01-21 2023-07-27 ExxonMobil Technology and Engineering Company Fluides colmatants et procédés associés
CN115386348B (zh) * 2022-09-14 2023-11-14 中国石油大学(华东) 超深层油气藏盐诱导自聚结改性纳米石墨及其制备方法和调控体系及其应用方法

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2667224A (en) * 1949-06-29 1954-01-26 Stanolind Oil & Gas Co Well completion process
US2912380A (en) * 1953-07-17 1959-11-10 American Viscose Corp Drilling fluids and method of preventing loss thereof from well holes
US3385789A (en) * 1964-03-05 1968-05-28 Charles M. King Composition and method for shale control
US3444276A (en) * 1966-04-04 1969-05-13 Dow Chemical Co Method for producing carbon-bonded graphite structures
US3807961A (en) * 1970-02-24 1974-04-30 Superior Graphite Co Apparatus for high-temperature treatment of petroleum coke
CA1091895A (fr) * 1975-07-01 1980-12-23 William M. Goldberger Methode et appareil pour le traitement thermique de matieres carbonees en lit fluidise
US4088583A (en) * 1976-12-02 1978-05-09 Union Oil Company Of California Composition and method for drilling high temperature reservoirs
US4123367A (en) * 1977-04-29 1978-10-31 Dodd Anita A Method of reducing drag and rotating torque in the rotary drilling of oil and gas wells
US4531594A (en) * 1982-10-25 1985-07-30 Venture Chemicals, Inc. Method and compositions for fluid loss and seepage loss control
US4501329A (en) * 1983-04-18 1985-02-26 Chevron Research Company Non-abrasive particulate material for permeability alteration in subsurface formations
US4957174A (en) * 1989-06-29 1990-09-18 Conoco Inc. Method of controlling lost circulation in well drilling
NL9001145A (nl) * 1990-05-16 1991-12-16 Norman Laurie Jacobs Smeermiddel.
ZA929373B (en) * 1991-12-06 1993-06-02 Chem Services Drilling mud additive.
US5211250A (en) * 1992-01-21 1993-05-18 Conoco Inc. Method for stabilizing boreholes

Also Published As

Publication number Publication date
EA199800570A1 (ru) 1998-12-24
EA000357B1 (ru) 1999-06-24
DE69632831T2 (de) 2005-07-14
NO982733D0 (no) 1998-06-12
SA97170710B1 (ar) 2006-09-04
AR004370A1 (es) 1998-11-04
EP0866842B1 (fr) 2004-06-30
CA2240290C (fr) 2005-06-28
CO4600753A1 (es) 1998-05-08
NO982733L (no) 1998-06-12
EP0866842A4 (fr) 1999-02-03
DK0866842T3 (da) 2004-10-11
NO314591B1 (no) 2003-04-14
DE69632831D1 (de) 2004-08-05
WO1997022677A1 (fr) 1997-06-26
US5826669A (en) 1998-10-27
CA2240290A1 (fr) 1997-06-26
AU1410297A (en) 1997-07-14
NO314591B2 (no) 2003-04-14
EP0866842A1 (fr) 1998-09-30
DZ2143A1 (fr) 2002-10-23

Similar Documents

Publication Publication Date Title
EG21132A (en) Drilling fluid loss prevention and lubrication additive
EP1144541A4 (fr) Additif de fluide de forage, et procede d'utilisation correspondant
ZA963862B (en) Additive combinations for lubricants and functional fluids
GB9409346D0 (en) Lubricating oil additives
SG44334A1 (en) Lubricating composition including an ester-use of the composition and well fluid including the composition
SG50653A1 (en) Lubricating oil additive lubricating oil and working fluid for refrigerators
GB9516843D0 (en) Drilling fluid
GB2335451B (en) Well fluid additive
GB9617582D0 (en) Drill-in fluids and drilling methods
GB9523840D0 (en) Lubricating oil additives
SG54284A1 (en) Lubricant oil composition
GB2289727B (en) Oil seal
GB2287265B (en) Low toxicity terpene drilling fluid and drilling fluid additive
GB9517371D0 (en) Drilling fluids
GB9404374D0 (en) Drilling fluids
GB9502972D0 (en) Lubricating oil additive
GB9410820D0 (en) Oil additives and compositions
GB2297775B (en) Drilling fluid
GB2297774B (en) Drilling fluid
EP0692531A4 (fr) Fluide electrovisqueux
GB9502452D0 (en) Drilling fluid
GB9300454D0 (en) Working fluid and lubricant combination
GB9215228D0 (en) Drilling fluid loss additive
GB9318810D0 (en) Lubricating oil additives
GB9325132D0 (en) Lubricating oil additives