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| Number | Title | Issue Date |
| 5240072 | Multiple sample annulus pressure responsive sampler The invention discloses a multiple sample annulus pressure responsive sampler which allows the collection of samples at different time intervals and at different depth intervals in a wellbore. In one embodiment, the tool contains cylindrical housing means... | 08/31/1993 |
| 5234057 | Shut-in tools A downhole shut-in tool includes in one aspect a pilot valve which when opened places a differential pressure across a piston which in turn operably engages a shut-in valve element to close the shut-in tool. An electronic timer assembly and electric drive... | 08/10/1993 |
| 5228345 | Apparatus for collecting samples from ground-holes The down-hole sampler comprises a reservoir, with screw-down type valves top and bottom. The valves are arranged with the axes of the screw threads vertical. The valve members are integral with the structure of the sampler, whereby even with the valves sc... | 07/20/1993 |
| 5224389 | Method and apparatus for taking samples from a groundwater monitoring site A method for taking samples from a groundwater monitoring site realized by measuring an electric conductivity of contaminated groundwater during operating a pump at high r.p.m. and by controlling a predetermined minimum variation of the electric conductiv... | 07/06/1993 |
| 5220829 | Downhole formation pump A downhole formation test pump includes a progressive cavity pump having a helical rotor received in a helical cavity of a stator. The pump may be disengaged by withdrawing the rotor from the stator to provide a bypass position so that the downhole format... | 06/22/1993 |
| 5195588 | Apparatus and method for testing and repairing in a cased borehole An apparatus is disclosed for perforating, testing, and repairing casing in an earth borehole. A device is moveable through the casing. The device can be mounted on a wireline, on tubing, or on both. A perforator is mounted in the device for producing a p... | 03/23/1993 |
| 5189909 | Device for measuring properties of underground water and method therefor An apparatus and method for measuring the properties of underground water are disclosed. The device comprises a measuring apparatus with a measuring sensor for measuring the properties of the underground water, a pair of expandable and contractible packer... | 03/02/1993 |
| 5184508 | Method for determining formation pressure A method for accurately determining the formation pressure of earth formans. Formation measurements are made with by use of a novel downhole tool which allows drilling mud to enter the tool in such a way that decompression of drilling mud is controlled s... | 02/09/1993 |
| 5176207 | Underground instrumentation emplacement system A system for placing instrumentation within a hole enables a wide variety of instruments to be placed in the hole with enhanced measurement resolution and minimum risk of becoming lodged in the hole by partial collapse of the hole wall. A flexible tubular... | 01/05/1993 |
| 5146998 | Apparatus and method for underground sampling A system and method for implanting an underground device. The system includes a hollow body for containing said underground device and a drive cone adapted to penetrate the ground. The drive cone is removably attached to the hollow body so that once the s... | 09/15/1992 |
| 5147561 | Device for sampling and stripping volatile chemicals within wells A sampling device for sealed positioning within the casing of a well contains a stripping chamber for stripping a ground water sample of its volatile compounds at or near the point of collection. In one embodiment, the stripping chamber includes a piston ... | 09/15/1992 |
| 5138877 | Method and apparatus for intersecting a blowout well from a relief well A method and apparatus for determining the horizontal pressure gradient of n earth formation penetrated by a borehole. This is done by: (a) establishing, through the wall of the borehole and isolated from fluids within the borehole, two direct fluid flow paths ... | 08/18/1992 |
| 5137086 | Method and apparatus for obtaining subterranean fluid samples Improved methods and apparatus are provided for obtaining multiple fluid samples from subterranean formations of interest. The present invention is particularly well suited for testing nuclear migration in ground water utilizing test wells surrounding a n... | 08/11/1992 |
| 5103906 | Hydraulic timer for downhole tool A downhole tool apparatus includes an operating mechanism and a hydraulic timer. The hydraulic timer is operably associated with the operating mechanism for providing a time delay prior to operation of the operating mechanism. The hydraulic timer includes... | 04/14/1992 |
| 5101904 | Downhole tool actuator An actuator for actuating a downhole mechanism in a well utilizes increased annular pressure in one instance, and a control line pressure in a second instance. The actuator has an actuating chamber in which an actuating piston moves. The actuating piston ... | 04/07/1992 |
| 5097914 | Method and device for producing unadulterated water samples in drilling a well A method and device is used for producing uncontaminated water samples when drilling a well, using a hollow bar for transporting drilling fluid whose conduits consist of nonperforated tubes and at least one perforated tube; the water sample is pumped thro... | 03/24/1992 |
| 5095745 | Method and apparatus for testing subsurface formations A method and apparatus for testing subsurface formations, particularly a formation having a permeability less than about 10 millidarcies is disclosed. The test is made by use of a down hole test tool designed in such a way as to control the decompression ... | 03/17/1992 |
| 5058674 | Wellbore fluid sampler and method A well fluid sampling apparatus provides a time delay after actuation of the tool and before a sample is taken. The tool is operated by well pressure acting on a piston. The piston is initially hydraulically blocked so that it cannot move. The time delay ... | 10/22/1991 |
| 5056600 | Control apparatus and method responsive to a changing stimulus A control system and method utilizing a race between two responses to a changing stimulus are disclosed. An example of a changing stimulus is pressure which increases at a decreasing rate of change during a closed-in period of a drill stem test in an oil ... | 10/15/1991 |
| 5056595 | Wireline formation test tool with jet perforator for positively establishing fluidic communication with subsurface formation to be tested A wireline tool, and process for its use, for lowering into wellbores for testing the gas pressure, and connate fluid flow rates, in low permeability oil or gas producing subsurface formations. The tool features a jet charge perforator for detonation to p... | 10/15/1991 |
| 5046568 | Driven groundwater sampling device A device for retrieving a groundwater sample is provided. The device includes an elonagated hollow housing, a closure assembly mounted on the top end of the housing, and a drive cone removably mounted on the bottom end of the housing. The drive cone is ad... | 09/10/1991 |
| 4979569 | Dual action valve including at least two pressure responsive members A valve in a tool may be opened and closed by sequential application of a first predetermined annulus pressure and a second predetermined annulus pressure. A first rupture disc ruptures when the first predetermined annulus pressure is applied to the well ... | 12/25/1990 |
| 4951749 | Earth formation sampling and testing method and apparatus with improved filter means A method for obtaining samples of connate fluids from formations traversed by a borehole, wherein a sample test chamber is brought in communication with an isolated portion of the borehole wall, and is opened so as to allow the connate fluids to fill the ... | 08/28/1990 |
| 4942923 | Apparatus for isolating a testing zone in a bore hole screen casing An apparatus for isolating a testing zone in a bore hole screen casing includes a lower plug member sealingly positionable at a desired longitudinal point within the casing and an upper plug that is independent of the lower plug is also sealingly position... | 07/24/1990 |
| 4940088 | Sonde for taking fluid samples, in particular from inside an oil well In order to take a practically unlimited number of fluid samples, in particular from a well in production, a sonde is used including as many modular sampling devices (10) as there are samples to be taken. These devices (10) are disposed end-to-end and the... | 07/10/1990 |
| 4915171 | Above packer perforate test and sample tool and method of use An above packer perforate, test and sample tool. The tool includes a tester valve which is positioned above a well packer and which has a bypass which provides communication between a well annulus above the packer and a firing mechanism for guns positione... | 04/10/1990 |
| 4903765 | Delayed opening fluid sampler A delayed opening fluid sampling tool comprises a body having three chambers and a port defined therein. The tool also comprises a metering device which is disposed in the body between two of the chambers, one of which chambers is for holding a metering f... | 02/27/1990 |
| 4898236 | Drill stem testing system A drill stem testing system which does not require rotation or axial displacement of an associated drill string to actuate valves and pumps is described. The system includes a drill stem constructed in a number of sections which are interconnected with sc... | 02/06/1990 |
| 4896722 | Multiple well tool control systems in a multi-valve well testing system having automatic control modes A multi-valve well testing system adapted to be disposed downhole in a borehole, includes a plurality of valves and a plurality of well tool control systems connected, respectively, to the plurality of valves and further includes an automatic control mode... | 01/30/1990 |
| 4884439 | Hydraulic circuit use in wireline formation tester A formation tester is set forth. It incorporates a probe having a surrounding elastomeric seal and snorkel for extension into formations. The probe connects with a sample line into the formation tester. On the sample line, a pressure sensor responds to pr... | 12/05/1989 |
| 4883123 | Above packer perforate, test and sample tool and method of use An above packer perforate, test and sample tool for use in obtaining a sample of fluid from a formation reservoir in a well. The apparatus includes a sampler and an actuator cylinder positioned above a packer and a valve body below the packer. An operatin... | 11/28/1989 |
| 4879900 | Hydraulic system in formation test tools having a hydraulic pad pressure priority system and high speed extension of the setting pistons 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, thereby cooperating w... | 11/14/1989 |
| 4878538 | Perforate, test and sample tool and method of use A perforate, test and sample tool for obtaining fluid samples from a formation reservoir in a well. The tool comprises a retrievable packer, perforating guns and a sampler disposed between the packer and guns which is adapted for entrapping a fluid sample... | 11/07/1989 |
| 4860580 | Formation testing apparatus and method A formation testing apparatus is shown for testing subsurface earth formations penetrated by a borehole. A tester body has two longitudinally spaced sealing pads which are used to isolate a portion of the well bore from well bore fluids. A pair of sample ... | 08/29/1989 |
| 4856585 | Tubing conveyed sampler A sampler apparatus for use in a well includes a housing having a full opening bore therethrough. A first removable sample chamber for trapping a well fluid sample is removably disposed in the housing in a location such as to avoid restricting the full op... | 08/15/1989 |
| 4856595 | Well tool control system and method In accordance with illustrative embodiments disclosed herein, a formation testing tool suspended in a well on a pipe string includes a valve actuator control system which responds to a command signal having a certain signature. The command signal is appli... | 08/15/1989 |
| 4848463 | Surface read-out tester valve and probe A well testing apparatus includes a housing having a formation fluid flow passage. A sliding sleeve tester valve is reciprocably disposed in the housing. A probe separable from the housing and constructed to be received coaxially within the sliding sleeve... | 07/18/1989 |
| 4845982 | Hydraulic circuit for use in wireline formation tester In a formation tester constructed with an extendable probe driven by hydraulic means, the means being connected to a hydraulic circuit, an improved apparatus is set forth which includes a hydraulic fluid multiplier means. This multiplier means is connecte... | 07/11/1989 |
| 4830107 | Well test tool A well test tool including a valve lowerable into a well on a flexible line and locked and sealed in a downhole landing receptacle, the valve being openable and closable to permit or prevent flow therethrough, well pressures below the test tool being sens... | 05/16/1989 |
| 4796699 | Well tool control system and method In accordance with illustrative embodiments disclosed herein, a formation testing tool suspended in a well on a pipe string includes a valve actuator control system which responds to a command signal having a certain signature. The command signal is appli... | 01/10/1989 |
