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| Number | Title | Issue Date |
| 7398826 | Well treatment with dissolvable polymer Well treatment is disclosed that includes injecting a well treatment fluid with insoluble polyol polymer such as polyvinyl alcohol (PVOH) dispersed therein, depositing the insoluble polymer in the wellbore or an adjacent formation, and thereafter dissolving the poly... | 07/15/2008 |
| 7347263 | Networked polymeric gels and use of such polymeric gels in hydrocarbon recovery A composition includes water having a salinity of at least 1 ppt, at least one hydrophilic polymer containing primary (—NH2) and/or secondary (—NHR) amine groups and at least one saccharide containing a reducible function. A method of changing the per... | 03/25/2008 |
| 7332459 | Method for scale inhibition in oil wells A method of inhibiting scale formation in a subterranean formation comprising: (a) injecting a suspension comprising particles of a controlled release scale inhibitor suspended in an aqueous medium into a formation through an injection well wherein the particles hav... | 02/19/2008 |
| 7308939 | Methods of using polymer-coated particulates Methods are provided including a method comprising: providing a treatment fluid comprising particulates at least partially coated with a polymer, wherein the polymer is deposited on the particulates by at least partially coating the particulates with a polymer solut... | 12/18/2007 |
| 7306039 | Methods of using crosslinkable compositions A thermal insulating packer fluid contains water and/or brine, a crosslinkable viscosifying polymer, a crosslinking agent and an optional set retarder. The composition is capable of inhibiting unwanted heat loss from production tubing or uncontrolled heat transfer t... | 12/11/2007 |
| 7276466 | Compositions and methods for reducing the viscosity of a fluid The present invention relates to improved methods and compositions for reducing the viscosity of subterranean servicing fluids where the servicing fluid has been cross-linked to increase its viscosity and that crosslinking can be reversed using a delayed release aci... | 10/02/2007 |
| 7271133 | Methods and compositions for treating subterranean formations Methods for treating subterranean formations and aqueous treating fluid compositions are provided. The aqueous treating fluid compositions comprise water, a water soluble hydrophobically modified gelling agent polymer produced by grafting a low concentration of hydr... | 09/18/2007 |
| 7261158 | Coarse-foamed fracturing fluids and associated methods A method of fracturing a subterranean formation comprising the steps of: providing a coarse-foamed fracturing fluid comprising a liquid fracturing fluid component, a gas, proppant particulates, and a foaming agent; and placing the coarse-foamed fracturing fluid into... | 08/28/2007 |
| 7196040 | Microcapsule well treatment A material and a device for releasing chemicals in a fluid environment is disclosed, and a method for releasing substances into downhole fluid environments. The invention also relates to materials for sand control and hydraulic fracturing. The substance release devi... | 03/27/2007 |
| 7182136 | Methods of reducing water permeability for acidizing a subterranean formation The present invention provides a method of stimulating a subterranean formation penetrated by a well. The formation has a water-bearing section and a hydrocarbon-bearing section. The method includes the steps of: (a) introducing into the formation an aqueous treatme... | 02/27/2007 |
| 7128148 | Well treatment fluid and methods for blocking permeability of a subterranean zone The present invention provides a method and treatment fluid for blocking the permeability of an elevated-temperature zone in a reservoir of a subterranean formation penetrated by a wellbore, the method comprising the steps of: a) selecting the zone to be treated, wh... | 10/31/2006 |
| 7108066 | Variable density treatment fluids and methods of using such fluids in subterranean formations The present invention provides variable density fluid compositions and methods for using such compositions in a subterranean formation. One exemplary embodiment of the variable density fluid compositions of the present invention comprises a variable density fluid co... | 09/19/2006 |
| 7049272 | Downhole chemical delivery system for oil and gas wells The invention provides a method of treating of a well, a formation, or both, with the solids, liquids, or apparatuses, by 1) encasing said solids, liquids, or apparatuses in a water-soluble shell, 2) conveying said encased solids, liquids, or apparatuses to a predet... | 05/23/2006 |
| 7037881 | Stabilized colloidal and colloidal-like systems The present invention generally relates to improved compositions comprising stabilized colloidal or colloidal-like phases (e.g., emulsions, aphrons) and methods of using those compositions. The compositions generally comprise an aqueous continuous phase, one or more... | 05/02/2006 |
| 6837316 | Methods of consolidating formations Methods of consolidating formations include drilling a well bore with a drilling fluid that comprises water, a polymeric cationic catalyst which is adsorbed on minerals and rocks in weak unconsolidated zones or formations and then further contacting the unconsolidat... | 01/04/2005 |
| 6823940 | Methods of consolidating formations and forming a chemical casing Methods of consolidating unconsolidated weak zones or formations and forming chemical casings include drilling a well bore with a drilling fluid having a pH in the range of from about 6 to 10 and that comprises water, a polymeric cationic catalyst which is adsorbed ... | 11/30/2004 |
| 6818597 | Suspensions of water soluble polymers in surfactant free non-aqueous solvents Liquid water soluble polymer suspensions in non-aqueous solvents are extremely stable over long periods of time with minimum separation of the solvent and no hard packing of the dispersed water soluble polymer. The suspensions enable a user to rapidly add the suspen... | 11/16/2004 |
| 6710019 | Wellbore fluid The present invention relates to a wellbore fluid comprising a particulate material composed of the reaction product of A) one or more water soluble organic compound having possessing a molecular weight of less than 30,000 and possessing at least two hydroxyl groups... | 03/23/2004 |
| 6599863 | Fracturing process and composition The invention provides a method of fracturing, including the provision and use of a fracturing fluid suspension containing an effective amount of a solid particulate breaker material having delayed breaking or degradation characteristics, additionally inc... | 07/29/2003 |
| 6387853 | Derivatization of polymers and well treatments using the same Polymers are derivatized and then may be introduced into a wellbore, such as in a hydraulic fracturing treatment. A polymer may be a guar powder that is mixed with a organic solvent and derivatized using a derivatizing agent, such as sodium chloroacetate.... | 05/14/2002 |
| 6194356 | Gelling composition for wellbore service fluids A wellbore service fluid comprising viscoelastic surfactants in combination with cross-linkable, preferably hydrophobically modified, water soluble polymers is described, particularly applicable to water control operations.... | 02/27/2001 |
| 5874387 | Method and cement-drilling fluid cement composition for cementing a wellbore A method and a drilling fluid/cement slurry composition for cementing a wellbore. The drilling fluid/cement slurry composition comprises A cement slurry composition comprising: a) a cementitious material; b) a drilling fluid; and c) a dispersant selected from ... | 02/23/1999 |
| 5834406 | Foamed gel for permeability reduction or mobility control in a subterranean hydrocarbon-bearing formation A process employing a foamed gel in a subterranean hydrocarbon-bearing formation to reduce the permeability of a treatment region therein or control the mobility of a drive fluid in the formation. The foamed gel is formed from a crosslinkable carboxylate-... | 11/10/1998 |
| 5654261 | Permeability modifying composition for use in oil recovery A method and use for a dry composition comprising a mixture of water-soluble polymer and an aluminum citrate preparation is disclosed. The polymer is capable of cross-linking in the presence of water and aluminum ions. Any water-soluble polymer known to t... | 08/05/1997 |
| 5563186 | Crosslinked alginate-based gels for matrix conformance A composition of matter for matrix conformance formed from an aqueous solution of an alginate polysaccharide and a method of forming an alginate polysaccharide gel. A Group IIA cation, Fe2+, Fe3+, Al3+, Mn2 +, Z... | 10/08/1996 |
| 5360787 | Dispersant compositions comprising sulfonated isobutylene maleic anhydride copolymer for subterranean well drilling and completion A dispersant for drilling fluids, spacer fluids, cement slurries, completion fluids and mixtures of drilling fluids and cement slurries used for drilling and cementing subterranean wells.... | 11/01/1994 |
| 5291949 | Method for inhibiting caustic flood breakthrough Polymers (and especially hydroxyethylcellulose) are crosslinked using a lanthanide as a crosslinking agent. The crosslinked polymers have utility in well completion, well stimulation, enhanced oil recovery, and subterranean fluid containment operations.... | 03/08/1994 |
| 5277830 | pH tolerant heteropolysaccharide gels for use in profile control A pH tolerant aqueous gel-forming composition for placement within a subterranean formation. The composition includes water, a viscosifying amount of a heteropolysaccharide prepared by growing Xanthomonas campestris NCIB 11854 in an aqueous nutrient medi... | 01/11/1994 |
| 5226480 | Recovery system containing lanthanide-crosslinked polymers Polymers (and especially hydroxyethylcellulose) are crosslinked using a lanthanide as a crosslinking agent. The crosslinked polymers have utility in well completion, well stimulation, enhanced oil recovery, and subterranean fluid containment operations.... | 07/13/1993 |
| 5226481 | Method for increasing the stability of water-based fracturing fluids A method for increasing the stability of water-based fracturing fluids is shown in which a base fracturing fluid is formulated by mixing together a hard mix water containing multivalent cations, a water soluble polymer and a cross-linking agent for the wa... | 07/13/1993 |
| 5145590 | Method for improving the high temperature gel stability of borated galactomannans A complexor solution and method of use are shown for providing controlled delay and improved high temperature gel stability of borated fracturing fluids. A base fluid is first prepared by blending together an aqueous fluid and a hydratable polymer which i... | 09/08/1992 |
| 5111886 | Crosslinked hydroxyethylcellulose and its uses Polymers (and especially hydroxyethylcellulose) are crosslinked using a lanthanide as a crosslinking agent. The crosslinked polymers have utility in well completion, well stimulation, enhanced oil recovery, and subterranean fluid containment operations.... | 05/12/1992 |
| 5089150 | Method of increasing retention of scale inhibitors in subterranean formations A novel method of injecting or squeezing a cross-linked scale inhibitor down a well into a subterranean formation which significantly lengthens its effective life is accomplished by cross-linking a carboxylic acid-containing polymeric or organophosphorus-... | 02/18/1992 |
| 5085787 | Crosslinked vinylamine polymer in enhanced oil recovery The production of oil or gas from a subterranean formation is enhanced by injecting into the formation, such as in acidized fracturing, an aqueous fluid containing as a viscosifier a crosslinked vinylamine polymer. Acidizing fluids are provided containing... | 02/04/1992 |
| 5082579 | Method and composition for delaying the gellation of borated galactomannans A complexor and method of use are shown for providing controlled delay of the cross-linking reaction in an aqueous well fracturing fluid. A base fluid is first prepared by blending together an aqueous fluid and a hydratable polymer which is capable of gel... | 01/21/1992 |
| 5080170 | Method for reducing fluid leak-off during well treatment Low permeability formations are hydraulically fractured with a fracturing fluid which includes a material capable of (1) bonding fine formation particles to prevent movement of the particles into and within the formation and (2) forming a permeability-red... | 01/14/1992 |
| 5067566 | Low temperature degradation of galactomannans A method is shown for fracturing a subterranean formation in which a hydratable polymer, crosslinking agent and breaker are combined to form a gelled fracturing fluid. The pH of the fracturing fluid is initially raised above and 9.0 to deactivate the brea... | 11/26/1991 |
| 5061387 | Aqueous gel system of partially methylated melamine-formaldehyde resin and polyvinyl alcohol A stable aqueous gel is formed from a polyvinyl alcohol or vinyl alcohol copolymer and a partially methylated melamine-formaldehyde resin in the presence of a pH regulating agent which provides an initial acid pH during the formulation of the gel.... | 10/29/1991 |
| 5015400 | Amino resins crosslinked polymer gels for permeability profile control A composition of matter wherein amino resins such as melamine formaldehyde ("MF") resins co-gel and crosslink with polymers useful for profile control where said polymers have amine, amide, hydroxyl and thiol functionalities. Resulting gels are useful as ... | 05/14/1991 |
| 4947934 | Method of increasing retention of scale inhibitor in subterranean formations A method for inhibiting the formation of scale in a well penetrating a subterranean formation for the production of fluids from the formation comprising injecting into the formation an acidic aqueous solution having a pH effective to form a water-soluble ... | 08/14/1990 |
