| Patent Number |
Title Of Patent |
Date Issued |
| H1611 |
Glycols as internal phase in oil well drilling fluids |
November 5, 1996 |
| An emulsion and emulsion drilling fluid are disclosed. The emulsion has utility as an oil based drilling fluid comprising a glycol emulsified in a synthetic hydrocarbon material. The synthetic hydrocarbon material has an average molecular weight of from about 120 to 1,000 and is synthesi |
| H1000 |
Water based synthetic hydrocarbon drilling fluid and spotting fluid |
December 3, 1991 |
| The present invention relates to an improved water based drilling fluid and an improved spotting fluid utilizing unhydrogenated synthetic hydrocarbon compositions which are non-polluting and minimally toxic. The invention provides excellent drilling fluid properties under a wide variety |
| 7377721 |
Methods for using reversible phase oil-based drilling fluid |
May 27, 2008 |
| Invert emulsion compositions including an oleaginous, a non-oleaginous and an amine surfactant that are useful in the oil and gas well drilling art are disclosed. The amine surfactant is selected so that the invert emulsion can be converted form a water-in-oil type emulsion to a oil- |
| 7312183 |
Shale hydration inhibition agent and method of use |
December 25, 2007 |
| A water-base fluid for use in drilling, cementing, workover, fracturing and abandonment of subterranean wells through a formation containing shale which swells in the presence of water. In one illustrative embodiment, the drilling fluid is composed of an aqueous based continuous phas |
| 7250390 |
High performance water based drilling fluids and method of use |
July 31, 2007 |
| A water-base fluid for use in drilling wells and other drilling operation includes a shale clay which swells in the presence of water. The fluid preferably includes: an aqueous based continuous phase, and a shale hydration inhibition agent having the formula: H--(OR).sub.x--[--NH--CH |
| 7192907 |
High performance water-based drilling mud and method of use |
March 20, 2007 |
| A water based drilling fluid for use in drilling a subterranean well through a subterranean formation that swells in the presence of water, the drilling fluid is formulated to include: an aqueous based continuous phase; a weigh material; a shale encapsulator and an optional shale hyd |
| 7178594 |
Method for using reversible phase oil-based drilling fluid |
February 20, 2007 |
| Invert emulsion compositions including an oleaginous, a non-oleaginous and an amine surfactant that are useful in the oil and gas well drilling art are disclosed. The amine surfactant is selected so that the invert emulsion can be converted form a water-in-oil type emulsion to a oil- |
| 7094738 |
Phospholipid lubricating agents in aqueous based drilling fluids |
August 22, 2006 |
| A method of improving the lubricity of an aqueous based drilling fluid composed of an aqueous base fluid, and a weighting agent. The method involves the addition of an effective amount of a phospholipid to substantially reduce the coefficient of friction when compared to the fluid ab |
| 7084092 |
Shale hydration inhibition agent and method of use |
August 1, 2006 |
| A water-base fluid for use in drilling, cementing, workover, fracturing and abandonment of subterranean wells through a formation containing a shale which swells in the presence of water. In one illustrative embodiment, the drilling fluid includes, an aqueous based continuous phase, |
| 7081437 |
Environmentally compatible hydrocarbon blend drilling fluid |
July 25, 2006 |
| A method of formulating and the resulting biodegradable wellbore fluid includes a first synthetic internal olefin fraction having from 16 to 18 carbon atoms (C.sub.16-18 IO), a second synthetic internal olefin fraction having between 15 to 18 carbon atoms (C.sub.15-18 IO), and a thir |
| 6857485 |
Shale hydration inhibition agent and method of use |
February 22, 2005 |
| A water-base drilling fluid for use in drilling wells through a formation containing a shale which swells in the presence of water. The drilling fluid preferably includes: an aqueous based continuous phase, a weight material, and a shale hydration inhibition agent having the formula:in w |
| 6831043 |
High performance water based drilling mud and method of use |
December 14, 2004 |
| A water-base fluid for use in drilling wells and other drilling operation includes a shale clay which swells in the presence of water. The fluid preferably includes: an aqueous based continuous phase, and a shale hydration inhibition agent having the formula: ##STR1## wherein R an |
| 6828279 |
Biodegradable surfactant for invert emulsion drilling fluid |
December 7, 2004 |
| An invert emulsion drilling fluid includes an oleaginous continuous phase; a non-oleaginous discontinuous phase; a biodegradable surfactant including a di-fatty acid ester of triglycerol; and a weighting agent. It is preferred that the fatty acid have the formula RCO.sub.2 H in which R i |
| 6806233 |
Methods of using reversible phase oil based drilling fluid |
October 19, 2004 |
| Invert emulsion compositions including an oleaginous, a non-oleaginous and an amine surfactant that are useful in the oil and gas well drilling art are disclosed. The amine surfactant is selected so that the invert emulsion can be converted form a water-in-oil type emulsion to a oil- |
| 6793025 |
Double emulsion based drilling fluids |
September 21, 2004 |
| A method of electrically logging subterranean wells using a conductive double emulsion fluid includes a miscible combination of an oleaginous fluid, an emulsifier capable of forming a microemulsion, an emulsifier capable of forming an invert emulsion, and an electrolytic salt. A micr |
| 6790811 |
Oil based drilling fluid |
September 14, 2004 |
| Invert emulsion compositions including an oleaginous, a non-oleaginous and an amine surfactant that are useful in the oil and gas well drilling art are disclosed. The amine surfactant is selected so that the invert emulsion can be converted form a water-in-oil type emulsion to a oil- |
| 6770602 |
Oil based well fluids with high solids content |
August 3, 2004 |
| A fluid having utility in subterranean wells is formulated to include: an oleaginous fluid; and a solids tolerance agent having the formula: ##STR1##in which R is a C.sub.6 to C.sub.20 aliphatic group and R' is a C.sub.2 to C.sub.6 aliphatic group and x has a value from about 1 to about |
| 6609578 |
Shale hydration inhibition agent and method of use |
August 26, 2003 |
| A water-base fluid for use in drilling wells and other drilling operation includes a shale which swells in the presence of water. The fluid preferably includes: an aqueous based continuous phase, and a shale hydration inhibition agent having the formula:in which R and R' are alkylene gro |
| 6589917 |
Invert emulsion drilling fluids and muds having negative alkalinity and elastomer compatibility |
July 8, 2003 |
| An invert emulsion suitable for drilling subterranean wells, in particular oil and gas wells is disclosed which has negative alkalinity and includes an oleaginous phase, and a non-oleaginous phase and an emulsifying agent which stabilizes the invert emulsion under conditions of negative |
| 6484821 |
Shale hydration inhibition agent and method of use |
November 26, 2002 |
| A water-base drilling fluid for use in drilling wells through a formation containing a shale which swells in the presence of water. The drilling fluid preferably includes: an aqueous based continuous phase, a weight material, and a shale hydration inhibition agent having the formula:in w |
| 6405809 |
Conductive medium for openhold logging and logging while drilling |
June 18, 2002 |
| A method of electrically logging subterranean wells using a conductive fluid includes a miscible combination of an oleaginous fluid, a polar organic solvent, an electrolytic salt, and a carbon dioxide buffer. The electrolytic salt or brine of the salt is present in a concentration su |
| 6308788 |
Conductive medium for openhole logging and logging while drilling |
October 30, 2001 |
| A method of electrically logging subterranean wells using a conductive fluid in which the conductive fluid includes a miscible combination of an oleaginous fluid, a polar organic solvent, and an electrolytic salt. The electrolytic salt or brine of the salt is present in a concentration |
| 6291405 |
Glycol based drilling fluid |
September 18, 2001 |
| This invention relates to an improved glycol based aqueous drilling fluid. The drilling fluid of this invention has demonstrated utility in controlling and/or reducing swelling of clay formations in the drilling of subterranean wells. |
| 6247543 |
Shale hydration inhibition agent and method of use |
June 19, 2001 |
| A water-base drilling fluid for use in drilling wells through a formation containing a shale which swells in the presence of water. The drilling fluid preferably includes: an aqueous based continuous phase, a weight material, and a shale hydration inhibition agent having the formula:in w |
| 6029755 |
Conductive medium for openhole logging and logging while drilling |
February 29, 2000 |
| A conductive fluid has been formulated for use in a method of electrically logging subterranean wells. The conductive fluid includes a miscible combination of an oleaginous fluid, a water soluble alcohol, and an electrolytic salt. The electrolytic salt or brine of the salt is present |
| 5990050 |
Water soluble invert emulsions |
November 23, 1999 |
| A drilling fluid and an invert emulsion fluid having utility for drilling, completing or working over subterranean oil and gas wells are disclosed. The drilling fluid includes a continuous phase that includes a preferentially-oil-soluble glycol ether which has a viscosity at 25.degre |
| 5985800 |
Invert emulsion fluids suitable for drilling |
November 16, 1999 |
| New drilling fluids have been invented which are invert emulsion fluids comprising an oleaginous liquid, a non-oleaginous liquid, and a protonated amine. Such fluids are acidic and thus useful in drilling wells in which acidic gases such as CO.sub.2 or H.sub.2 S are likely to be encounte |
| 5977031 |
Ester based invert emulsion drilling fluids and muds having negative alkalinity |
November 2, 1999 |
| An invert emulsion suitable for drilling subterranean wells, in particular oil and gas wells is disclosed which includes an oleaginous phase, and a non-oleaginous phase and a protonated amine surfactant which stabilizes the invert emulsion in the absence of an alkaline reserve material. |
| 5909779 |
Oil-based drilling fluids suitable for drilling in the presence of acidic gases |
June 8, 1999 |
| An alkaline-reserve-free, oil-based drilling fluid is disclosed as comprising an oleaginous liquid, and an amine surfactant having the structure R-NH.sub.2, wherein R represents a C.sub.12 -C.sub.22 alkyl group or alkenyl group. Such fluid is particularly useful in the drilling of su |
| 5908814 |
Drilling fluid additive and method for inhibiting hydration |
June 1, 1999 |
| This invention relates to drilling fluid additives that suppress clay swelling within a subterranean well and to methods for controlling clay swelling during the drilling of a subterranean well. In one embodiment trihydroxy alkyl amine is reacted with an alkyl halide or a water soluble |
| 5888944 |
Oil-based drilling fluid |
March 30, 1999 |
| A method of removing the filter cake formed from invert emulsion compositions including an oleaginous, a non-oleaginous and an acid sensitive surfactant in an oil and gas well are disclosed. The acid sensitive surfactant is selected so that the invert emulsion can be broken and resid |
| 5869433 |
Non-fluorescing oil-based drilling fluid |
February 9, 1999 |
| The present invention relates to an oil-based drilling fluid, a continuous phase for an oil-based drilling fluid, and additives for an oil-based drilling fluid. The drilling fluid, the continuous phase of the drilling fluid, and the additives for the oil-based drilling fluid are char |
| 5789349 |
Water-based drilling fluids with high temperature fluid loss control additive |
August 4, 1998 |
| This invention relates to an improved water based drilling fluid containing a controlled cross-linked polymeric fluid loss control agent. The novel polymeric fluid loss control agent of this invention exhibits improved thermal stability and other enhanced drilling fluid additive properti |
| 5712228 |
Silicone based fluids for drilling applications |
January 27, 1998 |
| An essentially non-polluting, substantially non-toxic drilling fluid composition has been discovered that is particularly useful as a lubricant or spotting fluid in drilling oil and gas wells. The fluid comprises silicone which may be is mixed with an emulsifier for application in the |
| 5707939 |
Silicone oil-based drilling fluids |
January 13, 1998 |
| The present invention relates to an improved continuous phase for a drilling fluid and specifically a silicone continuous phase which is non-polluting and substantially non-toxic. Preferred silicones for use in the invention are dimethylsiloxane polymers. In the drilling fluid compos |
| 5639715 |
Aqueous based drilling fluid additive and composition |
June 17, 1997 |
| A water based drilling fluid which is environmentally non-toxic containing a sodium alkylsufosuccinate and well drilling additives, said sodium alkylsulfosuccinate is water dispersible and imparts anti-bit balling, lubricity and environmentally non-toxicity properties to said drilling |
| 5635458 |
Water-based drilling fluids for reduction of water adsorption and hydration of argillaceous rock |
June 3, 1997 |
| The present invention provides a water-based drilling fluid that reduces water adsorption and hydration of argillaceous rocks. The drilling fluid comprises a glycol with a molecular weight of less than about 200, an organic cationic material such as salts of choline or an organic salt of |
| 5424284 |
Drilling fluid additive and method for inhibiting hydration |
June 13, 1995 |
| This invention relates to drilling fluid additives that suppress clay swelling within a subterranean well and to methods for controlling clay swelling during the drilling of a subterranean well. In one embodiment trihydroxy alkyl amine is reacted with an alkyl halide or a water soluble |
| 5350740 |
Drilling fluid additive and method for inhibiting hydration |
September 27, 1994 |
| This invention relates to drilling fluid additives that suppress clay swelling within a subterranean well and to methods for controlling clay swelling during the drilling of a subterranean well. A trihydroxy alkyl amine is reacted with an alkyl halide or a water soluble quaternary amine |
| 5189012 |
Oil based synthetic hydrocarbon drilling fluid |
February 23, 1993 |
| The present invention relates to an improved continuous phase for an oil based drilling fluid and specifically a synthetic hydrocarbon continuous phase which is non-polluting and minimally toxic. The invention provides excellent drilling fluid properties under a wide variety of drilling |
| 5149690 |
Drilling fluid additive and method for inhibiting hydration |
September 22, 1992 |
| This invention relates to drilling fluid additives that suppress clay swelling within a subterranean well and to methods for controlling clay swelling during the drilling of a subterranean well. Aliphatic polyamines and aliphatic acids react to form polyamides and polyamino acids that ar |
| 5134118 |
Aqueous based drilling fluid |
July 28, 1992 |
| This invention relates to an improved aqueous based drilling fluid and specifically to a water soluble polymer that imparts desirable performance characteristics to the final drilling fluid. The invention also relates to the method for preparation of the polymer and drilling fluid. The w |
| 4740319 |
Oil base drilling fluid composition |
April 26, 1988 |
| This invention relates to an improved oil-base drilling fluid composition and its use. The improved oil-base drilling fluid composition of this invention is characterized by thixotropic properties which result in a yield point of at least 4.0. The composition includes an oil-base con |
| 4713183 |
Oil based drilling fluid reversion |
December 15, 1987 |
| On occasion, during drilling operations employing oil base drilling muds, conditions occur that cause the surface of the solid materials in the mud to be water wet, changing the rheology of the drilling mud such that it is unusable and has to be discarded. In accordance with this inventi |
| 4710586 |
Fluid loss additives for oil base muds and low fluid loss compositions thereof |
December 1, 1987 |
| A novel ammonium salt of quebracho prepared by reacting quebracho with alkyl quaternary ammonium salts is an effective fluid loss control agent when used in oil base drilling fluids for use in drilling oil and gas wells, especially in water in oil emulsion drilling mud formulations, |
| 4637883 |
Fluid loss additives for oil base muds and low fluid loss compositions thereof |
January 20, 1987 |
| A novel ammonium salt of quebracho prepared by reacting quebracho with alkyl quaternary ammonium salts is an effective fluid loss control agent when used in oil base drilling fluids for use in drilling oil and gas wells, especially in water in oil emulsion drilling mud formulations, |
| 4595736 |
Thermally stable drilling fluid additive comprised of a copolymer of catechol-based monomer |
June 17, 1986 |
| This invention relates to a water soluble polymer and method for its preparation. The water soluble polymer exhibits superior thermal stability characteristics when used as an additive in aqueous drilling fluids. The polymer consists of a major portion of a catechol based monomer and a |
| 4579927 |
Copolymers of flavanoid tannins and acrylic monomers |
April 1, 1986 |
| This invention relates to a polymer and methods for its preparation. The water soluble polymer is especially useful in that it exhibits superior thermal stability characteristics when used as an additive in aqueous drilling fluids. The polymer consists of a minor portion of tannin derive |
| 4544756 |
Zwiterionic 2-alkyl imidazolines as emulsifying agents for oil based drilling fluids |
October 1, 1985 |
| Improved emulsifying agents for oil based drilling fluids, compared to imidazoline materials presently being used in oil based drilling fluids, that not only are excellent emulsifiers for oil based drilling fluids, but also are effective wetting agents and fluid loss control agents in in |
| 4525562 |
Thermally stable drilling fluid additive |
June 25, 1985 |
| This invention relates to a water soluble polymer and method for its preparation. The water soluble polymer exhibits superior thermal stability characteristics when used as an additive in aqueous drilling fluids. The polymer consists of a major portion of a catechol based monomer and a |
