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| Number | Title | Issue Date |
| 7427584 | Treating composition Treating compositions containing mutual solvents suitable for forming and maintaining single-phase aqueous fluid treating compositions containing very high concentrations of acids and/or chelating agents are described. Methods of use of these treating compositions f... | 09/23/2008 |
| 7392844 | Method of treating an oil or gas well with biodegradable low toxicity fluid system A method of treating a well consists of introducing into the wellbore a biodegradable fluid system containing a fatty acid ester, such as methyl soyate. The fluid system may further contain a lactic acid ester, such as ethyl lactate, and/or a nonionic surfactant. Th... | 07/01/2008 |
| 7284608 | Casing strings and methods of using such strings in subterranean cementing operations Improved casing strings, and methods of using improved casing strings in subterranean operations, are provided. An example of a method is a method of cementing a pipe string in a subterranean formation. Another example of a method is a method of cementing a pipe str... | 10/23/2007 |
| 7231976 | Method of treating an oil or gas well with biodegradable low toxicity fluid system A method of treating a well consists of introducing into the wellbore a biodegradable fluid system containing a blend of lactic acid ester, such as ethyl lactate, and a fatty acid ester, such as methyl soyate. The fluid system may be further in the form of a microem... | 06/19/2007 |
| 7207387 | Methods and compositions for use with spacer fluids used in subterranean well bores The present invention relates to spacer fluids used in subterranean operations and, more particularly, to spacer fluids that comprise water-soluble relative permeability modifiers and methods of using the spacer fluids in subterranean operations. In one embodiment, ... | 04/24/2007 |
| 7188676 | Method for displacing oil base drilling muds and/or residues from oil base drilling mud using water-in-oil emulsion Fluid producing wells may be treated with a water-in-oil emulsion for the removal or inhibition of unwanted solid particulates, including pipe dope, asphaltenes and paraffins. Such emulsions are of particular applicability in the displacement of oil base drilling mu... | 03/13/2007 |
| 7143827 | Well completion spacer fluids containing fibers and methods Well completion spacer fluids containing fibers and methods of using the spacer fluids are provided. A method of the invention for displacing a first fluid from a well bore with an incompatible second fluid comprises the following steps. A spacer fluid is placed bet... | 12/05/2006 |
| 7114568 | Hydrophobically modified polymers for a well completion spacer fluid A method and composition is provided for a relative permeability modifier for use with aqueous well treatment fluids that comprises a hydrophobically modified water soluble polymer or a hydrophilically modified water soluble polymer. ... | 10/03/2006 |
| 6762155 | Methods of removing water-based drilling fluids and compositions The present invention provides methods and compositions for removing a water-based drilling fluid from surfaces in a well bore and leaving the surfaces water-wet. A method of the invention basically comprises the following steps. A water-based drilling fluid removal... | 07/13/2004 |
| 6716282 | Methods and oil-based settable spotting fluid compositions for cementing wells Oil-based settable spotting fluid compositions for cementing in wells and subterranean formations are provided. The oil-based settable spotting fluid compositions basically comprise an oil external emulsion comprising oil, water and an emulsifying surfactant, a hydr... | 04/06/2004 |
| 6668927 | Well completion foamed spacer fluids and methods Well completion foamed spacer fluids and methods of using the foamed spacer fluids are provided. A method of the invention for displacing a first fluid from a well bore with an incompatible second fluid comprises the following steps. A foamed spacer fluid... | 12/30/2003 |
| 6554069 | Methods of removing water-based drilling fluids and compositions The present invention provides methods and compositions for removing a water-based drilling fluid from surfaces in a well bore and leaving the surfaces water-wet. A method of the invention basically comprises the following steps. A water-based drilling fl... | 04/29/2003 |
| 6524384 | Oil-based settable spotting fluid Oil-based settable spotting fluid compositions and methods of using the compositions are provided. The oil-based settable spotting fluid compositions are basically comprised of oil, an emulsifying surfactant for emulsifying the oil with water whereby an o... | 02/25/2003 |
| 6467492 | Corrosion inhibitors A method of preventing corrosion in pipelines comprising draining pipeline of all residual compounds, blowing through with nitrogen and rinsing with a corrosion inhibiting rinsing agent.... | 10/22/2002 |
| 6390197 | Method of cementing a well in geological zones containing swelling clays or mud residues containing clays Methods of treating wells for cementing operations and for improving placement of cement in wells containing water swelling clays include treatment of the well with a fluid containing clay precipitating agents capable of coagulating clays in the well. The... | 05/21/2002 |
| 6165948 | Method for drying out rock containing immobile formation water within the encroachment area of natural gas deposits and gas reservoirs The invention relates to a process for drying out rock containing immobile formation water in the intake radius of natural gas wells and gas storage wells which deliver less than 50 l of water per 1000 m3 (S.T.P.) of natural gas produced, in wh... | 12/26/2000 |
| 6148913 | Oil and gas field chemicals This invention is a process and a formulation for minimising the squeezing and shut-in operations needed to inhibit scale in a production well using the precipitation squeeze method by injecting into an oil-bearing rock formation a water-miscible formulat... | 11/21/2000 |
| 6138759 | Settable spotting fluid compositions and methods Improved settable spotting fluid compositions and methods are provided. The settable spotting fluid compositions are basically comprised of a hydraulic settable component comprised of fly ash, a fluid loss control additive, a gel strength inhibiting addit... | 10/31/2000 |
| 6063737 | Aqueous displacement fluid compositions for use in wellbores An aqueous displacement fluid composition is used as a spacer fluid composition to change one type of drilling mud for another type of drilling mud or in cementing operations downhole, to clean downhole hardware in wellbores. The method comprises introduc... | 05/16/2000 |
| 5977032 | Acidic surfactant composition and method for cleaning wellbore and flowline surfaces using the surfactant composition A method and composition for removing deposits of heavy hydrocarbonaceous materials and finely divided inorganic particulate matter from wellbore and flowline surfaces using a composition containing an alkyl polyglycoside, an ethoxylated alcohol, an acid ... | 11/02/1999 |
| 5962375 | Wellbore fluids Wellbore fluids are disclosed which comprise liquid dispersions of particulate mixed divalent metal carbonates having a generally platy crystal form. Mixed alkaline earth metal carbonates are preferred. The invention further relates to a method of well co... | 10/05/1999 |
| 5945386 | Glycol and glycol ether lubricants and spotting fluids A non polluting additive or spotting fluid which lubricates, releases and/or prevents differentially stuck drill strings and casings in the wellbore of a subterranean well is presented. This additive composition comprises a glycol or glycol ether derived ... | 08/31/1999 |
| 5866517 | Method and spacer fluid composition for displacing drilling fluid from a wellbore Spacer fluids comprising a dispersant selected from the group consisting of water soluble polymers comprising allyloxybenzene sulfonate or allyloxybenzene phosphonate polymerized with at least one of acrylic acid, acrylamides, alkyl acrylamides, maleic an... | 02/02/1999 |
| 5830831 | Surfactant blends for well operations Blends of alkyl polyglycoside surfactants having an alkyl chain length of C11 to C16 and blends of alkyl polyglycoside surfactants, in the presence of an ethoxylated alcohol cosurfactant, will form Winsor type III microemulsions in a water-oil mixture in ... | 11/03/1998 |
| 5789352 | Well completion spacer fluids and methods A well completion spacer fluid is provided which is particularly suitable for separating a cement slurry from drilling fluid in primary cementing operations. The well completion spacer fluid is also useful for separating other potentially incompatible flu... | 08/04/1998 |
| 5678631 | Process for removing solids from a well drilling system A process for cleaning a well system and equipment has been developed using a chemical additive that includes an alkene alcohol, preferably a terpene, and either an ether amine or base fluid or combination of the two. The additive can be used in an aqueou... | 10/21/1997 |
| 5501276 | Drilling fluid and filter cake removal methods and compositions Methods and compositions for removing gelled and dehydrated drilling fluid and filter cake from the walls of wellbores are provided. The methods basically include contacting the drilling fluid and filter cake with a removal composition comprised of an aqu... | 03/26/1996 |
| 5306340 | Scleroglucan-based compositions and their use as a cementation spacer Use of scleroglucan alone or of mixtures of scleroglucan with a polyalcohol or a dialdehyde as cementation spacers during oil drilling operations.... | 04/26/1994 |
| 5287929 | Method of using dispersant compositions for subterranean well drilling and completion A dispersant for drilling fluids, spacer fluids, completion fluids, cement slurries and mixtures of drilling fluids and cement slurries used for drilling and cementing subterranean wells.... | 02/22/1994 |
| 5284207 | Method of cleaning a well bore prior to a cementing operation Once the drilling of an oil or gas well is finished the bore must be cased and cemented. It is important that the cement lining be complete, and to ensure this it is necessary to sweep out the mud in the annulus ahead of the rising cement. Unfortunately, ... | 02/08/1994 |
| 5247995 | Method of dissolving organic filter cake obtained from polysaccharide based fluids used in production operations and completions of oil and gas wells The invention shows a method of degrading damaging material within a subterranean formation of a well bore using an enzyme treatment. Filter cakes and very viscous fluids are such damaging materials. The enzyme treatment degrades polysaccharide-containing... | 09/28/1993 |
| 5165477 | Enzymatic decomposition of drilling mud Drilling mud is rapidly decomposed by admixing one or more enzymes with the mud to selectively degrade one or more polymeric organic viscosifiers therein. A method of cleaning up a well site drilling mud pit containing drilling mud is provided. Also provi... | 11/24/1992 |
| 5113943 | Spacer fluids Spacer fluids providing an effective buffer between drilling fluids and cement slurries during well completion. The spacer fluids comprise a sulfonated styrene copolymer dispersant and one or more additional components such as surfactants, viscosifiers an... | 05/19/1992 |
| 5101902 | Aqueous spacer composition compatible with drilling muds and cement slurries An aqueous spacer composition, compatible with drilling muds and cement slurries including saline slurries, and application there of drilling oil and gas wells. Preferred spacer bases in accordance with the invention comprise a biopolymer of the type prod... | 04/07/1992 |
| 5061386 | Surfactant composition Surfactant composition comprising an alkyl amine ethoxylate and a gel breaker, wherein the gel breaker is a random copolymer of ethylene oxide with propylene oxide/or butylene oxide.... | 10/29/1991 |
| 5034139 | Polymer composition comprising phosphorous-containing gelling agent and process thereof Water absorbent polymers provided, in the form of a thixotropic hydrocarbon gel, demonstrate controlled water absorption. This property enables improved usage of such polymers in the reduction of the loss of circulation fluid or as a viscous sweep in the ... | 07/23/1991 |
| 5030366 | Spacer fluids Spacer fluids providing an effective buffer between drilling fluids and cement slurries during well completion. The spacer fluids comprise a sulfonated styrene copolymer dispersant and one or more additional components such as surfactants, viscosifiers an... | 07/09/1991 |
| 4977962 | Fluid additive and method for treatment of subterranean formations A method of substantially preventing the adsorption of polysaccharides or removing polysaccharides from clay surfaces in subterranean formations which are present as a result of contact by gravel packing, fracturing or other treatment fluids, by contactin... | 12/18/1990 |
| 4888120 | Water-based drilling and well-servicing fluids with swellable, synthetic layer silicates Synthetic swellable layer silicates corresponding to the following formula MgO.aMA.bAl2 O3.cSiO.sub.2.nH.sub.2 O (I) in which M is Na+ and Li+ having an Na:Li ratio of at least 1; A is F-, OH- ... | 12/19/1989 |
| 4796703 | Compositions for agglomerating solid contaminants in well fluids and methods for using same A composition for use in agglomerating and removing solid contaminants in well fluids is disclosed. The composition comprises a carrier and the amide/glyceride reaction product obtained by heating a secondary amine in the presence of a fat or oil. The com... | 01/10/1989 |
