Class 73/152.08 - Oil, gas, or water saturation

Subclass of Class 73 - Measuring and testing
Definition: Subject matter wherein the determination of the physical
No. of patents: 40
Last issue date: 06/03/2008

Number	Title	Issue Date
7380598	Method for detecting fluid leakage from a subterranean formation A method for the detection of a fluid leak from a plugged well extending from a surface of the earth to penetrate a subterranean formation which contains fluid by logging a collection chamber positioned in the plugged well. ...	06/03/2008
7363972	Method and apparatus for well testing A method for testing petroleum or water wells. A tool is secured to a tubing and run into the well and to the reservoir zone to be explored. An upper and a lower seal isolate the reservoir zone. A piston is run into the tubing and pumped down to the tool. When sampl...	04/29/2008
7340384	Process for determining the variation in the relative permeability of at least one fluid in a reservoir A method for determining for a reservoir (1) containing fluids (W, O), the variation in the relative permeability (krO, krW) of at least one of the fluids, as a function of the saturation of at least one of the fluids (W, O),) is provided. According to this m...	03/04/2008
7295927	Determining water saturation for oil bearing thin-bedded formation having anisotropic resistivity A method to estimate water saturation (Sw) of a thin-bedded formation is provided including (a) developing a model of anisotropy of resistivity (Rv/Rh) a function of water saturation (Swt) for one or more volume fractions ...	11/13/2007
7216533	Methods for using a formation tester A method of testing a downhole formation using a formation tester on a drill string. The formation tester is disposed downhole on a drill string and a formation test is performed by forming a seal between a formation probe assembly and the formation. A drawdown pist...	05/15/2007
7195063	Downhole sampling apparatus and method for using same A method and apparatus for sampling formation fluid includes drawing formation fluid from the subterranean formation into the downhole tool and collecting the formation fluid in a sample chamber. An exit flow line is operatively connected to the sample chamber for s...	03/27/2007
7059179	Multi-probe pressure transient analysis for determination of horizontal permeability, anisotropy and skin in an earth formation The specification discloses a downhole tool that determines hydraulic permeability of a downhole formation taking into account one or both of the dip angle of the borehole relative to the formation, and damage to the borehole wall and invasion of borehole fluid—co...	06/13/2006
7062072	Methods of producing images of underground formations surrounding a borehole A method of producing images of formations surrounding a borehole, comprises: obtaining values of a first parameter in the borehole as a function of depth and azimuth at a first resolution; obtaining values of a second parameter in the borehole as a function of dept...	06/13/2006
7036579	Method for measuring formation properties with a time-limited formation test An apparatus and method for determining at least one downhole formation property is disclosed. The apparatus includes a probe and a pretest piston positionable in fluid communication with the formation, and a series of flowlines pressure gauges, and valves configure...	05/02/2006
7028773	Assessing downhole WBM-contaminated connate water Water-based mud filtrate concentration in a downhole fluid sample drawn from the borehole of an oil well is assessed. To measure water-based mud filtrate concentration, a water-based mud having a water-soluble fluorescent dye tracer is pumped into the borehole; samp...	04/18/2006
6941804	Determining the PVT properties of a hydrocarbon reservoir fluid A method of determining an in situ PVT property of a hydrocarbon reservoir fluid that is present in a hydrocarbon-bearing formation layer traversed by a borehole, which method involves the steps of: a) calculating along the hydroca...	09/13/2005
5909772	Apparatus and method for estimating liquid yield of a gas/condensate reservoir Apparatus and method for determining a liquid yield from a gas/condensate reservoir. The apparatus and method first determines the porosity at each depth of a reservoir, using open hole logging techniques, before the well within the reservoir is used for ...	06/08/1999
5335542	Integrated permeability measurement and resistivity imaging tool A borehole tool having adjacently located fluid injection/withdrawal apparatus and an electromagnetic measurement apparatus is provided. The electromagnetic measurement apparatus can be an imaging apparatus for helping set the tool in desired locations fo...	08/09/1994
5059907	Method for evaluating the water saturation of subterranean formations from dielectric permittivity measurements Two types of dielectric logging tools are in use: the pad type which operates in the 100 to 1100 MHz frequency range and the mandrel type, which typically operates in the 10 to 100 MHz range. Although both types of tools make the same measurement, the low...	10/22/1991
5048328	Method of determining the porosity and irreducible water saturation of a coal cleat system The irreducible water saturation profile across the length of a core sample of coal is determined from four series of X-ray attenuation measurements made over the length of the core sample. The X-ray attenuation measurements are made while the core sample...	09/17/1991
4961343	Method for determining permeability in hydrocarbon wells During oil and gas well drilling operations, at the wellsite surface the percentage by volume of hydrocarbon gas present in the return drilling fluid is monitored in order to determine the percentage of gas saturation in the formation. Rate of penetration...	10/09/1990
4958286	Time-variant filter coefficients There is disclosed herein an improved method for processing the output signals from the receiver coil of an induction logging tool to account for nonlinear attenuation and phase shift of the induced electromagnetic field in the subsurface formation as a f...	09/18/1990
4916616	Self-consistent log interpretation method Responses of subsurface formations adjacent a well borehole are obtained from a number of types of well logs. The well logs typically include a resistivity log, a gamma ray log, a density log, a neutron log and an induction or electromagnetic wave log. Pa...	04/10/1990
4907448	Apparatus for measuring resistivity of porous rock Apparatus is provided for measuring resistivities along the length of a core sample of a porous rock under confining pressure and varying fluid saturations. A confining pressure sleeve surrounds the core sample. Resistivities are measured along the length...	03/13/1990
4833914	Pore pressure formation evaluation while drilling Formation strength and other measurement while drilling parameters are combined in a formation volumetric analysis which produces not only the traditional volumetric components of clay volume, mineral volume, total porosity, and water filled porosity, but...	05/30/1989
4790180	Method for determining fluid characteristics of subterranean formations Core samples are obtained from a plurality of differing depths in a subterranean formation. The samples are dried to effect an evaporation of the water content, leaving behind a salt precipitate. The dried samples are weighed. The salt precipitate is then...	12/13/1988
4786873	Method for evaluating water saturation in petroleum reservoirs from dielectric permittivity A new functional parameter reprsentative of the geometrical distribution of matrix material and the variable geometrical distribution of hydrocarbon and water in pore spaces in a porous earth formation is determined and is used to evaluate, or to determin...	11/22/1988
4733725	Single well test for evaluating CO₂ injection A test is provided for evaluating and/or designing an enhanced oil recovery process including CO2 injection. A modified log-inject-log technique is utilized to determine residual CO2 saturation and incremental hydrocarbon displacemen...	03/29/1988
4710906	Method and system for monitoring the stability of boreholes The potential for failure of a formation is predicated by using standard logging apparatus and techniques to monitor the change in a formation characteristic over an extended time period. Changes in this characteristic are attributed to absorption of flui...	12/01/1987
4584874	Method for determining porosity, clay content and mode of distribution in gas and oil bearing shaly sand reservoirs A method for determining formation porosity, volume of clay content, and mode of distribution in gas, oil, and water bearing shaly sand reservoirs provides solutions regardless of whether gas and oil densities are known or unknown, whether or not there is...	04/29/1986
4543821	Method and apparatus for measuring relative permeability and water saturation of a core A method of determining the oil and water relative permeabilities and the water saturation of a core of earthen material which includes providing two types of liquids to the core in a manner so that the liquids mix to form a two phase liquid which moves t...	10/01/1985
4517836	Method for determining oil saturation in a subsurface formation A borehole logging system includes a borehole gravity meter and a resistivity logging tool. A borehole gravity log and a resistivity log are produced over a select depth interval in a borehole. The bulk density of the subsurface formation surrounding the ...	05/21/1985
4506548	Method of locating potential low water cut hydrocarbon reservoirs in high water saturation sands A method of identifying potential low water cut hydrocarbon producing zones in sandstone formations lacking significant cementation and having relatively high log-indicated water saturations, implying the presence of significant amounts of unbound water. ...	03/26/1985
4502121	Machine method for determining the presence and location of hydrocarbon deposits within a subsurface earth formation In accordance with illustrative embodiments of the present invention, methods for processing well logging data comprises deriving measurements of a plurality of earth formations parameters and combining these measurements in a new manner to enable interpr...	02/26/1985
4486836	Well logging: utilizing superposition of step-profile responses of logging tools to improve logs Disclosed is a method of improving well logs, such as induction logs and LATEROLOGS, by taking into account the effect on a log measurement both of the particular bed in which it is taken and of one or more other beds. In one example the process starts wi...	12/04/1984
4484470	Method and apparatus for determining characteristics of clay-bearing formations The volume of clay within earth formations is determined throughout the vertical extent of a borehole using measurements of the natural gamma rays emitted from these formations comprised substantially entirely of clay. The clay volume determination is use...	11/27/1984
4484278	Well logging: utilizing superposition of step-profile responses of logging tools to improve logs Disclosed is a method of improving well logs, such as induction logs and laterologs, by taking into account the effect on a log measurement both of the particular bed in which it is taken and of one or more other beds. In one example the process starts wi...	11/20/1984
4413512	Method of locating potential low water cut hydrocarbon reservoirs A method of identifying potential low water cut hydrocarbon producing zones of a formation having significant water saturation (i.e. about 50% or more of the available pore space). The formation is logged to determine its water saturation. The formation r...	11/08/1983
4399693	Applications of borehole gravimetric techniques to determine residual oil saturation A method for borehole gravimetric determination of residual oil saturation of a formation is described. In a preferred embodiment plural measurements of the local gravity are taken at each of spaced locations within a well and those departing more than a ...	08/23/1983
4397181	Method for determining fluid saturation in a subsurface formation A subsurface formation surrounding a borehole is flushed with at least one fluid having a density difference from that of the water content of the formation. Borehole gravity logs are recorded. Porosity is also recorded. From the density, gravity and poro...	08/09/1983
4354381	Sonic attenuating method for distinguishing between oil, water and gas A novel method is disclosed for using the resonance behavior of reservoir sand to distinguish between oil-rich, gas-rich and water-rich zones. A wellbore is logged, as for example with a long spaced acoustic logging tool, to obtain data which are then int...	10/19/1982
4353248	Well logging to determine the nature and extent of mud filtrate penetration A method of open borehole logging is disclosed which provides a mud filtrate penetration index which is proportional to the degree of mud filtrate invasion causing residual oil removal from the vicinity immediately surrounding the borehole. The present in...	10/12/1982
4233839	Apparatus and method for determining characteristics of subsurface formations The determination of a "composite" parameter of the formation water in formations surrounding a borehole, for example the composite conductivity of the formation water, is used in the disclosure to obtain a relatively accurate determination of formation c...	11/18/1980
4233840	Method for evaluation of the response of different cores to a recovery process and apparatus therefor Method and apparatus for subjecting discrete core specimens which have been removed from a subterranean strata or formation, and which contain an amount of bitumen, to a test procedure whereby to evaluate the response of different subterranean formations ...	11/18/1980
4052893	Measuring reservoir oil saturation A procedure for obtaining data to determine both residual and mobile oil saturations in the vicinity of a test well. The steps are (1) drill with oil or oil-base mud, (2) produce to remove oil filtrate, (3) run laterolog, microlaterolog and pulsed neutron...	10/11/1977

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Class 73/152.08 - Oil, gas, or water saturation