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| Number | Title | Issue Date |
| 6868341 | Methods and apparatus for processing acoustic waveforms received in a borehole A method and apparatus for determining isolating and/or removing a signal of interest from acoustic data. The method and apparatus may be used to measure formation slowness in a cased borehole, in which case the signal of interest may be a casing arrival signal. The... | 03/15/2005 |
| 6839633 | Methods and apparatus for imaging a subsurface fracture A method and apparatus for imaging subsurface fractures using an ST plane for quick looks and quality checks at the wellsite. Incident angles of impinging acoustic waves with respect to receivers are estimated from actual and apparent slowness, and the position of t... | 01/04/2005 |
| RE38578 | Method and apparatus for cementing a well A method of cementing a well permitting a reduction in the degree of diameter reduction of casing or liners required, and not requiring excessively large initial conductor casing, is described. The method is characterized by provision of an enlarged wellbore and a n... | 09/14/2004 |
| 6768105 | Methods and apparatus for downhole fluids analysis A method of determining GOR comprising subjecting a fluid to spectroscopic analysis at a first wavelength sensitive to gas and a second wavelength sensitive to oil, determining a response matrix for the contribution of gas at the first and second wavelengths and the... | 07/27/2004 |
| 6749022 | Fracture stimulation process for carbonate reservoirs A new process of fracture stimulating a carbonate reservoir in a subterranean formation to stimulate the production of hydrocarbon fluids from the formation is described. During the process, the composition and reactivity of the fracture stimulation fluid that is in... | 06/15/2004 |
| 6748330 | Method and apparatus for anisotropic vector plane wave decomposition for 3D vertical seismic profile data A wavefield separation method and apparatus for 3D VSP data, which handles arbitrary 3D source and receiver geometries, and common shot 3C data oriented to North, East and Vertical geographical coordinates and makes use of anisotropic medium properties at the downho... | 06/08/2004 |
| 6739423 | Acoustic logging tool A sleeve for an acoustic logging tool has a structure with a window section having fewer bars than a conventional sleeve separated by a slotted region with thin circumferential slots which are stress-relieved at the ends (“dumb-bell” shaped). Steel receiver moun... | 05/25/2004 |
| 6720290 | Foaming agents for use in coal seam reservoirs A well treatment fluid composition that comprises a carrier fluid and an amphoteric surfactant, and optionally a viscosifying agent and proppant, is well suited for use in fracturing coal beds to stimulate methane production. The composition preferably is a foam tha... | 04/13/2004 |
| 6705398 | Fracture closure pressure determination A method for assessing the fracture pressure closure is proposed. This method includes first injecting a fluid into the formation at a first generally constant rate Q to create a fracture, and then, dropping the pumping rate to significantly smaller feed rate q so t... | 03/16/2004 |
| 6703352 | Viscoelastic surfactant fluids and related methods of use Viscoelastic surfactant based aqueous fluid systems useful as thickening agents in various applications, e.g. to suspend particles produced during the excavation of geologic formations. The surfactants are zwitterionic/amphoteric surfactants such as dihyd... | 03/09/2004 |
| 6701955 | 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 valv... | 03/09/2004 |
| 6675895 | Well cementing The combination of the cement contamination laboratory measurements and the field log measurement allows to perform the evaluation of cement placement and quality related to the designed percentage cement displacement coverage and set-up times in the casi... | 01/13/2004 |
| 6668922 | Method of optimizing the design, stimulation and evaluation of matrix treatment in a reservoir A method for designing acid treatments provides for the selection of optimal treatment for well stimulation wherein reservoir characteristics are obtained to further select the reaction kinetic data on the minerals of interests, the treatment to the reser... | 12/30/2003 |
| 6667280 | Fluid system having controllable reversible viscosity This Invention relates to a novel reversible thickener, i.e., a fluid whose viscosity can be carefully modulated--from very low viscosity to sufficient viscosity to act as a barrier to further flow; particularly preferred embodiments are directed to fluid... | 12/23/2003 |
| 6660693 | Methods for dewatering shaly subterranean formations Methods are provided for increasing the production of hydrocarbons from shaly formations that contain adsorbed condensed hydrocarbon gases by treating such formations with dewatering compositions comprising surfactants that cause the surfaces of the forma... | 12/09/2003 |
| 6656265 | Cementation product and use for cementing oil wells or the like The present invention provides a cementing composition for an oil well or the like with porosity of less than 50%, and with a solid phase constituted by 35% to 65% (by volume) hollow microspheres, 20% to 45% Class G Portland cement, and 5% to 25% of Class... | 12/02/2003 |
| 6656266 | Cementing composition and application thereof to cementing oil wells or the like Cementing compositions which are particularly suitable for squeeze cementing operations, comprise an aqueous phase, and a micro-cement, the aqueous phase including an aqueous suspension comprising a vinyl acetate type polymer obtained by chemically cross-... | 12/02/2003 |
| 6654688 | Processing sonic waveform measurements Methods for determining the best value for at least one slowness-related parameter that has been determined in a number of ways is disclosed. Sonic logging data input in the methods are processed to determine multiple values of at least one slowness-relat... | 11/25/2003 |
| 6645288 | Cementing compositions and application of such compositions for cementing oil wells or the like The present invention provides cementing compositions for oil wells or the like comprising an hydraulic binder and reinforcing particles constituted by a flexible material of low compressibility, and with an average grain size of less than 500 μm. The co... | 11/11/2003 |
| 6644402 | Method of installing a sensor in a well Coiled tubing (120) is used to drill into a subsurface formation and provide a conduit back to the surface to allow sensors (200) to be deployed and measurements made for monitoring of the formation. A method of monitoring subsurface formation properties ... | 11/11/2003 |
| 6638896 | Fluids and techniques for hydrocarbon well completion The Invention relates to fluids and techniques to optimize/enhance the production of hydrocarbon from subterranean formations (e.g., "completion fluids"), in particular, fluids and techniques are. disclosed and claimed which remove wellbore damage and nea... | 10/28/2003 |
| 6637517 | Compositions containing aqueous viscosifying surfactants and methods for applying such compositions in subterranean formations The improved recovery of hydrocarbons from subterranean formations by hydraulically fracturing a subterranean formation is accomplished. Fracturing fluids using a viscosifying surfactant fluid containing viscosifying micelles, for example, wormlike micell... | 10/28/2003 |
| 6632778 | Self-diverting resin systems for sand consolidation Herein is described a fluid that is useful in consolidating a formation without the use of a gravel pack and screen. In particular, the fluid is useful in consolidating heterogeneous formations where the permeability is not uniform over-the total formatio... | 10/14/2003 |
| 6631768 | Expandable shifting tool Embodiments of the present invention disclose apparatus and methods that can be used to mechanically actuate a downhole tool with an expandable shifting tool. One embodiment of the invention is an expandable shifting tool comprising a housing having an ou... | 10/14/2003 |
| 6631764 | Filter cake cleanup and gravel pack methods for oil based or water based drilling fluids A method of gravel packing a wellbore which has at least one aperture therein that provides a fluid flow path between the wellbore and an adjacent subterranean formation. At least a part of the formation adjacent to the open hole has a filter cake coated ... | 10/14/2003 |
| 6631767 | Method and apparatus for selective injection or flow control with through-tubing operation capacity A downhole flow control device is provided for remotely controlling fluid flow of production or injection fluids, and may offer the capacity to pass wireline tools therethrough. In a broad aspect, the device may include: a body member having a first bore ... | 10/14/2003 |
| 6630890 | Methods, systems and tools for borehole logging A borehole logging tool system includes a surface system, a logging array, and a logging cable providing power supply and data paths connecting the logging array to the surface system, wherein the logging array includes a series of discrete sondes connect... | 10/07/2003 |
| 6625544 | Method of controlling the quality of seismic data migration by using the generalized radon transform description The present invention relates to a method of controlling the quality of seismic data that has been migrated using the generalized Radon transform, the method serving to pass between a seismic data space and a migrated image space, in which method a parame... | 09/23/2003 |
| 6616751 | Water-selective cementing composition A cementing composition comprising a hydraulic cement powder dispersed in a solvent that is miscible both with water and hydrocarbons to make a slurry. The cement powder can be made up simply of hydraulic cement materials or can be a mixture of such mater... | 09/09/2003 |
| 6613720 | Delayed blending of additives in well treatment fluids The effect of various chemical or biological agents in well treatment fluids can be delayed by sequestering the agents in the discontinuous phase of an emulsion for a period of time, before the emulsion is destabilized by exposure to at least one of: (1) ... | 09/02/2003 |
| 6610441 | Annular pack An annular pack for a cylindrical member for use in a wellbore includes a housing adapted to be mounted about an exterior circumference of the cylindrical member. The housing has mutually engagable annular segments. At least one of the annular segments de... | 08/26/2003 |
| 6089332 | Steerable rotary drilling systems A steerable rotary drilling system has a bottom hole assembly which includes, in addition to the drill bit, a modulated bias unit and a control unit, the bias unit comprising a number of hydraulic actuators around the periphery of the unit, each having a ... | 07/18/2000 |
