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| Number | Title | Issue Date |
| 7328610 | Method for measuring formation properties with a formation tester A method is disclosed for estimating a formation pressure using a formation tester disposed in a wellbore penetrating a formation, said method comprising: (a) establishing fluid communication between a pretest chamber in the downhole tool and the formation via a flo... | 02/12/2008 |
| 7240537 | Method for the determination of the wall friction profile along pipes by pressure transients measurements The present invention deals with a method which allows to determine the wall friction profile along pipes transporting liquids, particularly petroleum industry liquids, by measuring the pressure transients induced by fast changes in the flow rate. This method is app... | 07/10/2007 |
| 7178392 | Determining the pressure of formation fluid in earth formations surrounding a borehole A method for determining formation fluid pressure in earth formation surrounding a borehole wall uses a downhole probe coupled to a variable-volume cavity. The probe is driven into contact with formation at the borehole wall. The method includes expanding the volume... | 02/20/2007 |
| 6993963 | Method for determining pressure profiles in wellbores, flowlines and pipelines, and use of such method Method for determining pressure profiles in wellbores, flowlines and pipelines flowing singlephase and multiphase fluids and use of such a method. The flow is temporarily stopped or restricted with a quick acting valve and the pressure is continuously recorded at a ... | 02/07/2006 |
| 5621170 | Method for testing gas wells in low pressured gas formations The "Tank Test" method for determining well tests in low pressured reservoirs utilizes gravity drainage from a water storage tank to inject water into the reservoir. The Tank Test eliminates the need for expensive pumping equipment and the required manual... | 04/15/1997 |
| 5247829 | Method for individually characterizing the layers of a hydrocarbon subsurface reservoir The invention relates to reservoir evaluation and is more specifically directed to a method of characterizing the individual response of a layer of a multi-layer hydrocarbon reservoir traversed by a well, based on downhole flow rate and pressure measureme... | 09/28/1993 |
| 5095983 | Multiphase production evaluation method using thru-tubing, wireline packoff devices A method for providing improved measurement of oil, water, and gas flow rates in producing wells using thru-tubing wireline inflatable and retrievable packers or plugs to systematically isolate producing zones within a wellbore. Surface flow rates are mea... | 03/17/1992 |
| 4803873 | Process for measuring flow and determining the parameters of multilayer hydrocarbon producing formations The invention concerns a process for measuring the flow as a function of time of the several layers of a subterranean multilayer hydrocarbon-producing formation through which a well is drilled, and for determining the parameters of formation by comparison... | 02/14/1989 |
| 4797821 | Method of analyzing naturally fractured reservoirs Determining pressure characteristics of fluid flow from a wellbore provides a method to obtain physical characteristics of a subterranean reservoir. An analytical solution of flow a flow model for an underground dual porosity reservoir is obtained for the... | 01/10/1989 |
| 4779200 | Method for estimating porosity and/or permeability In a drill stem test, a packer is set in the well bore to isolate a potential producing zone. A drill pipe with a down hole valve is fitted through the packer. The pipe is usually partially filled with a liquid column prior to commencement of the test, wh... | 10/18/1988 |
| 4677849 | Hydrocarbon well test method The invention relates to a well test method for determining the physical characteristics of a system made up of a well and a subsurface formation containing a fluid such as a hydrocarbon. A change in the flow rate of said fluid is produced for a short per... | 07/07/1987 |
| 4597290 | Method for determining the characteristics of a fluid-producing underground formation Disclosed is a method for determining the physical characteristics of a system made up of a well and an underground formation containing a fluid and communicating with the well. A change in the rate of flow of the fluid is produced and a measurement is ma... | 07/01/1986 |
| 4483187 | Surface readout drill stem test control apparatus A surface readout (SRO) system for use with a wire line drill stem testing apparatus is disclosed. More particularly, the preferred and illustrated embodiment sets forth control circuitry for such a system. At the time that a well has been drilled and a p... | 11/20/1984 |
| 4348897 | Method and device for determining the transmissibility of a fluid-conducting borehole layer A method and apparatus for determining the transmissibility of a fluid-conducting layer (stratum), such as an aquifer that is accessible through a borehole. The fluid-level in the borehole is stimulated to a periodic or an aperiodic damped oscillation. By... | 09/14/1982 |
