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| Number | Title | Issue Date |
| 7219736 | Externally testable redundant connections for subsea wells An externally testable redundant connection for a subsea well includes a tube, a connector assembly, and collar. The connector assembly includes a jam nut over the tube; a ferrule over the tube adjacent the jam nut; and a double jam nut disposed over the tube adjace... | 05/22/2007 |
| 7210344 | 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... | 05/01/2007 |
| 7165634 | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are des... | 01/23/2007 |
| 7147068 | Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are des... | 12/12/2006 |
| 7143826 | Method for determining sand free production rate and simultaneously completing a borehole The current invention provides methods for determining the sand production rate from unconsolidated and poorly consolidated subterranean formations under varying drawdown pressures. The current invention also allows for immediate production of fluid from the subterr... | 12/05/2006 |
| 7066266 | Method of treating oil and gas wells A method of stimulating an entire target formation of an oil or gas well during fluid treatment is obtained by dividing the target formation into intermediate zones and initiating stimulation in each intermediate zone. Once stimulation is initiated in each intermedi... | 06/27/2006 |
| 7048050 | Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are des... | 05/23/2006 |
| 7036610 | Apparatus and method for completing oil and gas wells A method of drilling and completing a wellbore in a geological formation to produce hydrocarbons from a well comprising at least the following four steps: drilling the well with a retrievable drill bit attached to a casing; removing the retrievable drill bit from th... | 05/02/2006 |
| 7024930 | 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... | 04/11/2006 |
| 6959762 | Method and apparatus for formation damage removal A method for evaluating the permeability and formation damage in the porous rock around a well bore. This method relates to the use of a single string coiled tubing and a down hole assembly which includes a microcontroller, an electrically operable fluid control val... | 11/01/2005 |
| 6928868 | Water well monitoring system An apparatus and method for monitoring a liquid level in a 4-20 mA closed loop system are provided. A process instrument and a measuring unit are powered for a predetermined time and power is provided by a battery. ... | 08/16/2005 |
| 6918440 | Testing drill packer One embodiment of the present disclosure describes a test assembly including an inflatable packer. An internal control sleeve controls flow of drilling fluid through an inflation port to inflate and deflate the packer. A shifting tool run on a slick line moves the s... | 07/19/2005 |
| 6530428 | Method and apparatus for in-situ production well testing An apparatus for in situ borehole testing having a drill string with drill pipe and drill bit. An upper sleeve and lower sleeve are telescopically coupled together. A valve seat is located in an interior passage and closes the interior passage when a valv... | 03/11/2003 |
| 6364015 | Method of determining fracture closure pressures in hydraulicfracturing of subterranean formations The closure pressure (Pc) of a fracture generated in a subterranean formation is determined by creating a fracture in the formation, permitting the fracture to close, and performing post-closure pulse testing. The method is particularly applica... | 04/02/2002 |
| 6296056 | Subsurface measurement apparatus, system, and process for improved well drilling, control, and production Subsurface wellbore conditions are measured directly in the wellbore while the fluid circulation system is not pumping. The measured values are recorded at the subsurface location and subsequently transmitted to the well surface when circulation is resume... | 10/02/2001 |
| 6148664 | Method and apparatus for shutting in a well while leaving drill stem in the borehole A drill stem has a testing tool and a drill bit. To drill, the drill stem is rotated and weight is applied to the bit from the surface. To test a formation, the drill stem is left in the borehole. Compressed gas purges mud from the drill stem. The testing... | 11/21/2000 |
| 6148912 | Subsurface measurement apparatus, system, and process for improved well drilling control and production Subsurface wellbore conditions are measured directly in the wellbore while the fluid circulation system is not pumping. The measured values are recorded at the subsurface location and subsequently transmitted to the well surface when circulation is resume... | 11/21/2000 |
| 5864057 | Method and apparatus for conducting well production tests A nipple is provided downhole as part of a tubing (drill string or production) string. The nipple has an interior passage with recesses therein and a seat. A data probe attached to a wireline traverses inside of the tubing from the surface to the nipple. ... | 01/26/1999 |
| 5383122 | Method for analyzing pressure buildup in low pumping rate wells The pressure build-up of hydrocarbon wells is quickly measured allowing the well to be shut-in for a shorter length of time than previously possible to achieve the same results. After the well has been shut-in at the surface the rate of change of the leve... | 01/17/1995 |
| 5092167 | Method for determining liquid recovery during a closed-chamber drill stem test Method for determining the volume of fluid produced and other production characteristics from a subterranean formation during a drill stem test based on determining the location of well fluid within the drill stem tubing by measuring the travel time of an... | 03/03/1992 |
| 4953137 | Method for determining earth stresses in formations surrounding a cased well An acoustic logging tool traverses a fluid-filled cased well with a monopole acoustic energy source. Pressure waves in the well fluid by the source generate symmetric tube waves in the well casing immediately adjacent the source. At least one spaced-apart... | 08/28/1990 |
| 4890487 | Method for determining horizontal and/or vertical permeability of a subsurface earth formation Pressure and flow measurements made during extraction of fluid samples from a subsurface earth formation using a borehole logging tool having a single extraction probe are analyzed to derive separate values for both horizontal and vertical formation perme... | 01/02/1990 |
| 4799157 | Method for uniquely estimating permeability and skin factor for at least two layers of a reservoir A method for layered reservoirs without crossflow in order to estimate individual layer permeabilities and skin factors is disclosed. The method consists of two sequential drawdown tests. During these tests the wellbore pressure and the sandface flow must... | 01/17/1989 |
| 4790378 | Well testing apparatus Well testing apparatus for running on a single-conductor electric cable for gathering reservoir information, the apparatus utilizing two pressure gages and a valve, the valve being landable in a downhole receptacle and being operable to shut in the well o... | 12/13/1988 |
| 4761997 | Ground water well dimensioning procedure The dimensioning of a ground water well is obtained by investigating the yield characteristics of the ground water region by conducting a series of pumping runs using an observation tube in stepwise pumping cycles of short time intervals (15 seconds to 20... | 08/09/1988 |
| 4749038 | Method of designing a fracturing treatment for a well A fracturing treatment schedule, including several phases of fracturing fluid quantities and corresponding concentations, is designed within maximum constraints imposed by a job pump time and a critical proppant concentration which are derived in response... | 06/07/1988 |
| 4745802 | Formation testing tool and method of obtaining post-test drawdown and pressure readings A formation tester is set forth. The device utilizes a snorkel extending from the formation tester to obtain a pressure test and collect samples from a formation of interest. The apparatus includes multiple sample storage containers. The sample line is co... | 05/24/1988 |
| 4674328 | Method and apparatus for determining subsurface conditions using a tubing packoff tool A method and apparatus are provided for permitting an instrumentation package to be repeatedly locked and unlocked at any number of desired depths inside a subsurface production tube for the determination of the shut-in physical conditions at those depths... | 06/23/1987 |
| 4553428 | Drill stem testing apparatus with multiple pressure sensing ports In accordance with an illustrative embodiment of the present invention, a drill stem testing apparatus includes a housing leaving a full-opening bore, and a main test valve for opening and closing the bore in order to flow and shut-in the formation interv... | 11/19/1985 |
| 4513612 | Multiple flow rate formation testing device and method A method and apparatus for measuring the permeability, as well as the deliverability, of earth formations traversing a well bore, includes drawing one or more formation flow tests, usually of small volume, from a given formation interval after the region ... | 04/30/1985 |
| 4461172 | Well monitoring, controlling and data reducing system An apparatus is provided for gathering monitored data from one or more selected wells of a number of wells and reducing the monitored data in a real time manner to a useful form for analysis by one skilled in ground water evaluation. The apparatus can als... | 07/24/1984 |
| 4408485 | Rotary straddle tester apparatus with safety joint back-off clutch In accordance with an illustrative embodiment of the present invention, a one-way clutch mechanism is incorporated between the mandrel and housing of a rotary-operated pump apparatus that is used to inflate the packers of a drill stem testing system. The ... | 10/11/1983 |
| 4392377 | Early gas detection system for a drill stem test A method for testing earth formations informs the operator of the density of the formation fluid being produced before it reaches the surface. In the method, a bypass sub is secured to the drill string. The bypass sub has a bore for receiving a wireline t... | 07/12/1983 |
| 4372380 | Method for determination of fracture closure pressure A method of determining the minimum in-situ stress of an underground formation penetrated by a well. The method includes injecting a fluid at a certain rate into the formation to produce fractures in the formation, backflowing the injected fluid from the ... | 02/08/1983 |
| 4339948 | Well formation test-treat-test apparatus and method Discloses apparatus and method for testing, then treating, then testing the same sealed off region of earth formation within a well bore. Employs a sealing pad arrangement carried by the well tool to seal the test region to permit flow of formation fluid ... | 07/20/1982 |
| 4328705 | Method of determining characteristics of a fluid producing underground formation A graphical plot of pressure versus time during pressure build-up in a temporarily closed well is matched to a type-curve on a graph of such curves to determine if the well is fractured, acidified, fissured or damaged.... | 05/11/1982 |
| 4270385 | Tool for testing earth formations in boreholes A tool for testing earth formations which is divided into upper and lower pivotable sections to alleviate the problem of becoming differentially stuck. A unique pivot structure incorporating sample chamber seal valve assembly, is provided.... | 06/02/1981 |
| 4248081 | Tool for testing earth formations in boreholes A tool for testing earth formations in boreholes provides a failsafe function for retracting the sealing pad elements of a formation isolation device, in the form of elements operable in response to failure of downhole power supply for the tool to effect ... | 02/03/1981 |
| 4223725 | Method for reservoir fluid drift rate determination The magnitude of fluid drift rate at a well in a reservoir is determined by first injecting a known volume of a fluid containing a tracer, then shutting in the well for a period of time to allow movement of the injected tracer fluid, then producing said w... | 09/23/1980 |
| 4159643 | Method of and apparatus for measuring bottom hole well pressure A method of and apparatus for measuring bottom hole pressure in the tubing of a well by installing an isolation assembly in the tubing by a locking and sealing device in which the assembly includes first and second ports in communication between the inter... | 07/03/1979 |
