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| Number | Title | Issue Date |
| 7581590 | Heterogeneous proppant placement in a fracture with removable channelant fill A method of heterogeneous proppant placement in a subterranean fracture is disclosed. The method comprises injecting well treatment fluid including proppant (16) and proppant-spacing filler material called a channelant (18) through a wellbore (10 | 09/01/2009 |
| 7565929 | Degradable material assisted diversion Degradable material assisted diversion (DMAD) methods for well treatment, DMAD treatment fluids, and removable plugs for DMAD in downhole operations. A slurry of solid degradable material is injected into the well, a plug of the degradable material is formed, a down... | 07/28/2009 |
| 7507693 | Viscoelastic surfactant fluid systems comprising an aromatic sulfonate and methods of using same Methods of improving shear recovery time of viscoelastic surfactant fluid systems are described, one method involving providing a viscoelastic surfactant fluid system comprising a major portion of a surfactant and a rheology enhancer in a concentration sufficient to... | 03/24/2009 |
| 7458424 | Tight formation water shut off method with silica gel A delayed gelling system useful in conformance control in the production of petroleum from subterranean formations, especially low permeability formations, is disclosed. The gelling system comprises a basic silica sol, an activator comprising a hydroxyl donor, and a... | 12/02/2008 |
| 7431087 | Internal breaker for oilfield fluids Delayed breakers are given that break viscoelastic surfactant fluids inside the pores of formations into which the fluids have been injected. The breakers comprise proteins, proteins that contain breakers, or cells that contain breakers. Proteins become breakers, an... | 10/07/2008 |
| 7431083 | Sub-surface coalbed methane well enhancement through rapid oxidation A method of stimulating production of coalbed methane involves providing a perforation charge comprising a standard charge portion and a charge additive able to produce localized temporary oxidizing environments in perforations. A coal-bearing formation is perforate... | 10/07/2008 |
| 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 |
| 7419937 | Method for providing treatment chemicals in a subterranean well A method of delivering chemicals such as scale inhibitor into a wellbore producing fluids includes providing the chemicals, in a slow-release form, in a container located in the path of the production fluids so that the production fluids pass through the container. ... | 09/02/2008 |
| 7419004 | Method of gravel packing with oil-based carrier fluid A method is disclosed for gravel packing a hole in a subterranean formation including the step of pumping into the hole a gravel pack composition comprising gravel and a carrier fluid comprising a brine-in-oil emulsion, said emulsion being stabilized by an emulsifie... | 09/02/2008 |
| 7402549 | Viscoelastic surfactant rheology modification A method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer selected from partially hydrolyzed polyvinyl ester and partially hydrolyzed polyacryl... | 07/22/2008 |
| 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 |
| 7387986 | Viscoelastic surfactant rheology modification A method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of an amphiphilic polymeric rheology enhancer containing at least one portion that is a partially hydrolyzed... | 06/17/2008 |
| 7386431 | Method system and program storage device for simulating interfacial slip in a hydraulic fracturing simulator software A method, practiced by a Hydraulic Fracturing Simulator software, is adapted for simulating a hydraulic fracture in an Earth formation, the formation including a plurality of layers, a slip zone, which represents a debonding between adjacent layers of the Earth form... | 06/10/2008 |
| 7380602 | Composition and method for treating a subterranean formation A method of treating a subterranean formation with a retarded self-diverting fluid system. The method includes contacting the formation with a mixture of acid, chelating agent, and betaine surfactant in which the betaine surfactant is mixed with an aqueous solution ... | 06/03/2008 |
| 7380601 | Degradable fiber systems for stimulation A method for minimizing the amount of metal crosslinked viscosifier necessary for treating a wellbore with proppant or gravel is given. The method includes using fibers to aid in transporting, suspending and placing proppant or gravel in viscous carrier fluids other... | 06/03/2008 |
| 7304019 | Concentrated suspensions Suspensions are provided of water-soluble materials in non-aqueous carrier fluids using suspension agents that include organophilic clays. Methods of forming such suspensions are provided. Methods are also provided for using such suspensions to prepare aqueous solut... | 12/04/2007 |
| 7265079 | Self-destructing filter cake A composition and method are given for self-destructive fluid loss additives and filter cakes in wellbores and subterranean formations. The fluid loss additives and filter cakes are formed from a mixture of particulate solid acid-precursors, such as a polylactic aci... | 09/04/2007 |
| 7219731 | Degradable additive for viscoelastic surfactant based fluid systems A method is given for treating a subterranean formation penetrated by a wellbore with a viscosified fluid. The fluid contains a solid hydrolysable polyacid that upon dissolution and hydrolysis releases an acid that is a breaker for the viscosifying system. Suitable ... | 05/22/2007 |
| 7165613 | Propped fracture with high effective surface area Propped fractures in formations from which fluids are produced are described that have wormholes extending out into the formations from the faces of the fractures at locations distant from boreholes. Methods are given for creating such propped fractures having wormh... | 01/23/2007 |
| 7166560 | Generating Acid Downhole in Acid Fracturing An acid fracturing method is provided in which the acid is generated in the fracture by hydrolysis of a solid acid-precursor selected from one or more than one of lactide, glycolide, polylactic acid, polyglycolic acid, a copolymer of polylactic acid and polyglycolic... | 01/23/2007 |
| 7152677 | Method and gravel packing open holes above fracturing pressure The present invention provides a method for gravel packing a open-hole wellbore having a filter cake, comprising pumping a gravel slurry into a first portion of an annulus between the wellbore and a screen, at a sufficient rate and pressure to form at least a first ... | 12/26/2006 |
| 7148184 | Self-diverting foamed system A method is given for diverting acids in matrix acidizing and acid fracturing. The acids are diverted with a diverting agent that is an energized or foamed acidic viscoelastic surfactant system that contains a viscoelastic surfactant that gels and increases in visco... | 12/12/2006 |
| 7148185 | Viscoelastic surfactant fluids stable at high brine concentration and methods of using same A viscous aqueous high density well treatment fluid composition stable at high temperature containing a surfactant and inorganic salts is described. Methods of preparing the fluid and increasing the stability and viscosity of the fluid are given. The fluid is useful... | 12/12/2006 |
| 7134492 | Mapping fracture dimensions Hydraulic fracture dimensions and, optionally, fracture closure pressure and time are determined by adding particulate matter that discharges to create an acoustic signal to the proppant, allowing the particulate matter to discharge, and detecting the acoustic signa... | 11/14/2006 |
| 7119050 | Fluid system having controllable reversible viscosity This Invention relates to methods of treating a subterranean hydrocarbons reservoir comprising contacting the formation with a treating fluid comprising an aqueous solution, an acid, a surfactant acting as gelling agent essentially consisting of erucylamidopropyl be... | 10/10/2006 |
| 7114567 | Propped fracture with high effective surface area Propped fractures in formations from which fluids are produced are described that have wormholes extending out into the formations from the faces of the fractures at locations distant from boreholes. Methods are given for creating such propped fractures having wormh... | 10/03/2006 |
| 7111683 | Formation consolidation process A formation consolidation process is described which comprises injecting into an unconsolidated or poorly consolidated subterranean formation penetrated by a wellbore an aqueous pumpable system comprising an insoluble silica source (e.g., colloidal silica, silica fu... | 09/26/2006 |
| 7084095 | Methods for controlling the rheological properties of viscoelastic surfactants based fluids It was found that the addition of polymers to viscoelastic surfactant base system allows to adjust the rheological properties of the base fluid. Depending in particular on one side of the ratio of the concentration of added polymer and the concentration of viscoelas... | 08/01/2006 |
| 7082993 | Means and method for assessing the geometry of a subterranean fracture during or after a hydraulic fracturing treatment A method is given of fracturing a subterranean formation including the step of a) pumping at least one device actively transmitting data that provide information on the device position, and further comprising the step of assessing the fracture geometry based on the ... | 08/01/2006 |
| 7066260 | Dissolving filter cake Methods are presented to induce a screenout during a subterranean formation fracturing or combined fracturing and gravel packing treatment having a viscoelastic surfactant-based carrier fluid by laying down a filter cake at least a portion of which is a base-soluble... | 06/27/2006 |
| 7063147 | Method and apparatus and program storage device for front tracking in hydraulic fracturing simulators A method and system and program storage device is adapted to continuously update a perimeter of a fracture footprint created in an Earth formation when a fracturing fluid fractures the formation penetrated by a wellbore. Two embodiments of a Volume of Fluid (VOF) so... | 06/20/2006 |
| 7063738 | Permeable cements A permeable cement composition comprises an aqueous slurry of a hydraulic cement including a water-immiscible dispersed fluid phase, such as oil or gas, and a hollow particulate material, the hollow particulate material being one which breaks down in the presence of... | 06/20/2006 |
| 7028775 | Compositions and methods for treating a subterranean formation A method is provided for diverting the majority of the fluid injected into a stratified subterranean formation, that has at least one problematic zone and at least one hydrocarbon zone, into the hydrocarbon zone. In the method, a viscous diverting fluid made with a ... | 04/18/2006 |
| 7008908 | Selective stimulation with selective water reduction A method for preferentially treating a subterranean formation having at least one primarily oil producing layer and at least one primarily water producing layer. The method involves the steps of providing a water shut-off gel into the formation to preferentially tre... | 03/07/2006 |
| 7004255 | Fracture plugging Compositions and methods are given for plugging of natural or artificially-created fractures in subterranean formations to reduce the flow of fluids. The compositions are mixtures of primarily inert particles of different sizes that leave a minimal flow path for flu... | 02/28/2006 |
| 7000632 | Valve apparatus A valve apparatus that has a longitudinal axis therethrough comprises a valve seat member, a valve closure member, a fluid flow path, and a screening member. The valve seat member comprises a hollow bore and a first frustoconical contact surface. The valve closure m... | 02/21/2006 |
| 6978838 | Method for removing filter cake from injection wells A method is given for completing an interval of an open-hole injection well penetrating a subterranean formation when the interface between the wellbore and the formation includes a zone invaded by a filter cake that includes bridging materials and other embedded so... | 12/27/2005 |
| 6966376 | Method and composition for downhole cementing Disclosed is a method to increase the bonding forces of a hydraulic cement to a subterranean pipe (such as a casing) by the addition of at least one cementitious expansive agent to increase the bulk volume of the cement plug and a latex. The method includes position... | 11/22/2005 |
| 6953091 | Cementing compositions including a dispersant agent for cementing operation in oil wells The invention concerns a cementing composition for cold zones cementing operations in an oil well or analogous, said composition comprising a aqueous fluid base, solid particles including cement particles, and a dispersing agent in solution in the aqueous fluid base... | 10/11/2005 |
| 6938693 | Methods for controlling screenouts Methods are presented to induce a screenout during a subterranean formation fracturing or combined fracturing and gravel packing treatment by laying down a filter cake early in the treatment, then injecting proppant slurry, and then while proppant slurry injection c... | 09/06/2005 |
