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| Number | Title | Issue Date |
| 7439495 | Nuclear imaging probe A nuclear imaging probe 1 for measuring the density of a subsurface formation GF in a limited zone surrounding a well-bore hole WBH. The probe comprises: a pad 2 having a face arranged so as to be positioned in contact with a well-bore wall WBW, at lea... | 10/21/2008 |
| 7386430 | Method of correcting triaxial induction arrays for borehole effect A method for modeling borehole effects of a transverse array induction tool includes selecting a formation-borehole model having a set of parameters, wherein the set of parameters comprises a direction of tool eccentering; determining initial values for the set of p... | 06/10/2008 |
| 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 |
| 7301345 | While-drilling methodology for estimating formation pressure based upon streaming potential measurements Logging-while-drilling apparatus and methodologies for measuring streaming potential in an earth formation are provided. The apparatus and methodologies can be utilized to find information relevant to the drilling operations. In particular, since the streaming poten... | 11/27/2007 |
| 7234521 | Method and apparatus for pumping quality control through formation rate analysis techniques The present invention provides a method and apparatus for determination of the quality of a formation fluid sample including monitoring permeability and mobililty versus time to determine a filtrate contamination level, single phase state without gas and solids in t... | 06/26/2007 |
| 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 |
| 7168310 | Accuracy of shaly sand formation evaluation A novel process and methodology in deterministic formation evaluation is provided. The formation evaluation results can accurately quantify formation attributes, such as clay-volume, clay-bound-water, effective-porosity and water saturation in shaly sands. Total-por... | 01/30/2007 |
| 7069780 | Gravity techniques for drilling and logging Techniques for using gravity in applications such as drilling and logging. Techniques are present for (1) gravity well logging using gravity sensors arrays; (2) creating density pseudosections using gravity measurements; (3) performing Gravity Measurement While Dril... | 07/04/2006 |
| 7062957 | Percolation test apparatus A percolation test apparatus comprises a water tank (12), a pipe (36) for directing water from the tank into a hole (20) in the ground, an on-off valve (32) for controlling the flow of water in the conduit, and a water level sensor (30... | 06/20/2006 |
| 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 |
| 6978672 | Wireline apparatus for measuring steaming potentials and determining earth formation characteristics Earth formations are characterized by using an array of electrodes which can measure streaming potentials in the formation, and by interpreting the data obtained by the electrodes. The electrodes are placed on a wireline tool, a LWD tool, or in a fixed manner about ... | 12/27/2005 |
| 6976386 | Tensiometer methods A method for collecting data regarding a matric potential of a media includes providing a tensiometer having a stainless steel tensiometer casing, the stainless steel tensiometer casing comprising a tip portion which includes a wetted porous stainless steel membrane... | 12/20/2005 |
| 6772621 | Tensiometer methods and apparatus A method for collecting data regarding a matric potential of a media includes providing a tensiometer having a stainless steel tensiometer casing, the stainless steel tensiometer casing comprising a tip portion which includes a wetted porous stainless steel membrane... | 08/10/2004 |
| 6615653 | In situ method for determining soil liquefaction tendency and its prevention by electro-osmosis A method for determining the liquefaction tendency of a water saturated soil is provided in which a driven or self boring probe with a plurality of expanding and contracting bladders imposes a cyclic shear stress reversal on a body of soil in situ, and fr... | 09/09/2003 |
| 6601461 | Multi-phase compensated spinner flow meter A compensated flow measuring system for measuring a multi-phase fluid flow in a well. An impeller intercepts a downhole multi-phase flow. Capacitance and conductivity sensors are mounted in close proximity to the impeller and provide a measure of electric... | 08/05/2003 |
| 6490531 | Optimized method for determining physical parameters of a sample subjected to centrifugation A method for faster determination of physical parameters (capillary pressure curves and relative permeabilities for example) of a geologic sample initially saturated with a first fluid placed in a vessel and subjected to centrifugation in the presence of ... | 12/03/2002 |
| 6453727 | Method of evaluating physical parameters of an underground reservoir from rock cuttings taken therefrom System of evaluating physical parameters such as the absolute permeability of porous rocks of a zone of an underground reservoir, from fragments taken from this zone, such as rock cuttings carried along by the drilling mud. Rock fragments (F) are immersed... | 09/24/2002 |
| 6380745 | Electrical geophysical apparatus for determining the density of porous materials and establishing geo-electric constants of porous material The invention includes an apparatus for determining geo-electric data and the density of a porous material. A resistivity-measuring device applies an electrical current through an electrode array to that is part of a non-electrical conductive test cell th... | 04/30/2002 |
| 6263726 | Sidewall tensiometer and method of determining soil moisture potential in below-grade earthen soil A sidewall tensiometer to in situ determine below-grade soil moisture potential of earthen soil includes, a) a body adapted for insertion into an opening in earthen soil below grade, the body having lateral sidewalls; b) a laterally oriented porous materi... | 07/24/2001 |
| 5969240 | Methods for determining irreducible water resistivity and estimating oil well reserves A method for determining the resistivity of water in an oil well site that includes rock that is capable of water entrapment, includes the steps of: (a) retrieving a sample of the rock; (b) identifying any entrapped water in the sample; and (c) determining the resi... | 10/19/1999 |
| 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 |
| 5861751 | Electrical geophysical methods and apparatus for determining the in-situ density of porous material The invention includes a method and device for determining the in-situ density of a porous material. A resistivity measuring device applies an electrical current through an electrode array to measure the resistivity of the porous material. The resistivity... | 01/19/1999 |
| 5861750 | Geophysical methods and apparatus for determining the hydraulic conductivity of porous materials A method and device for determining the hydraulic conductivity of porous materials is disclosed. The method uses a general permeability equation for calculating the hydraulic conductivity. The resistivity of the porous material is measured when the porous... | 01/19/1999 |
| 5829520 | Method and apparatus for testing, completion and/or maintaining wellbores using a sensor device The present invention is an improved method and apparatus for testing and monitoring wellbore operations. The invention is (1) a data acquisition device capable of monitoring, recording wellbore and/or reservoir characteristics while capable of fluid flow... | 11/03/1998 |
| 5679885 | Process and device for measuring physical parameters of porous fluid wet samples A process involves placing a solid sample imbibed or saturated with a first fluid (for example water) in a closed chamber; injecting, via pressure means, another liquid under pressure at a first end of the chamber to drain or expel the first liquid from t... | 10/21/1997 |
| 5663499 | Method for estimating permeability from multi-array induction logs An improved method of estimating formation permeability is provided. Essentially, the improved method of the present invention combines a mud cake build-up/invasion model and a fully implicit near-well bore model from which radial formation resistivities ... | 09/02/1997 |
| 5279153 | Apparatus for determining horizontal and/or vertical permeability of an earth formation Apparatus for obtaining horizontal and/or vertical permeability measurements through a probe having an elongate aperture. The invention uses the elongate aperture in the probe to orient fluid flow in an earth formation horizontally or vertically. The elon... | 01/18/1994 |
| 5269180 | Borehole tool, procedures, and interpretation for making permeability measurements of subsurface formations A borehole tool has a source probe in fluid contact with the borehole wall, a fluid flow line for bringing fluids to and from the source probe, two injection fluid chambers containing clean oil and clean water and in fluid contact with the fluid flow line... | 12/14/1993 |
| 5265015 | Determining horizontal and/or vertical permeability of an earth formation Fluid flow measurements are made in situ using a repeat formation tester with a modified probe aperture, or on rock samples using a mini-permeameter with a modified probe aperture. The modified probe aperture has an elongate cross-section, such as ellipti... | 11/23/1993 |
| 5251286 | Method for estimating formation permeability from wireline logs using neural networks A method for determining rock formation permeability from wireline well logs utilizes neural networks. The neural networks provide consistency, accuracy and overall quality without bias to the calculations.... | 10/05/1993 |
| 5159569 | Formation evaluation from thermal properties A method for determining thermal characteristics of a geological formation from observations of temperature relaxation in a formation after a temperature perturbation, such as that resulting from circulation of drilling mud. A method of determining petrop... | 10/27/1992 |
| 4903207 | Method for determining reservoir bulk volume of hydrocarbons from reservoir porosity and distance to oil-water contact level For a formation zone of a well, a method for determining the relationship between bulk volume of oil $c;o as a function of total effective formation porosity $c;E and height h above the oil water contact from capillary pressure... | 02/20/1990 |
| 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 |
| 4740077 | Centrifugal measurement of core samples An adaptable, accurate, high resolution centrifuge core measuring method using a single strobe flash per measurement uses a microprocessor controller to control the measuring method, not a computer. The controller, not the camera clock, decides when the c... | 04/26/1988 |
| 4669299 | Measuring relative permeability to steam in cores of water and oil containing reservoir formations Relative permeabilities to flowing steam water and/or oil phases within cores of earth formations are determined by flowing such fluids at reservoir conditions, sealing them within the cores, X-ray scanning the sealed cores and determining the saturations... | 06/02/1987 |
| 4644283 | In-situ method for determining pore size distribution, capillary pressure and permeability An in-situ method of determining the pore size distribution, capillary pressure curve, and permeability of a formation using induced polarization logging measurements. The induced polarization (IP) voltage decay curve is measured opposite the formation of... | 02/17/1987 |
| 4594887 | Method and apparatus for determining characteristics of clay-bearing formations The volume of clay within clay-bearing formations is determined throughout the formations. This volume of clay is then functionally related to measurements indicative of formation porosity, such as density and neutron well logs of the formations. Utilizin... | 06/17/1986 |
| 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 |
| 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 |
