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| Number | Title | Issue Date |
| 4730263 | Method and device for measuring gamma radiation A method and device for measuring peak gamma radiation is provided wherein the method includes the steps of determining a minimum and maximum number of counts within a preselected multiple channel energy spectrum measurement range, determining a channel h... | 03/08/1988 |
| 4709357 | Method and apparatus for acoustically investigating a borehole casing cement bond A method and apparatus are disclosed for acoustically investigating a borehole casing cement bond. A sonde is provided which is adapted to be lowered into a borehole and which includes a plurality of acoustic transducers arranged in a helical array around... | 11/24/1987 |
| 4703804 | Debris removal and gauge ring device and method A device and method for removal of debris from well bores coincident with introduction and placement of a bridge plug. The device comprises a hollow cylindrical body open at both ends. The lower end of the device is adapted to form a gauge ring, integral ... | 11/03/1987 |
| 4697638 | Downhole logging and servicing system with manipulatable logging and servicing tools Disclosed is a downhole logging and servicing system with manipulatable logging and servicing tools. The system includes a conveyor for running the tools into and out of the well bore and a manipulating apparatus operable responsive to fluid pressure to m... | 10/06/1987 |
| 4694166 | Logging device having bimetallic insulating flask A logging device is disclosed for utilization in the detection of low energy photons. The logging device includes a sonde suitable for insertion into a wellbore. An insulating storage vessel is disposed within the sonde and serves to insulate a photon det... | 09/15/1987 |
| 4646026 | Method and apparatus for measuring resistivity of an earth formation A method and apparatus are described for reducing "Groeningen" effect and other anomaly induced errors in resistivity measurements of an earth formation. Such errors are typically noted during resistivity measurements of an earth layer and are generally r... | 02/24/1987 |
| 4620591 | Chemical cutting apparatus having selective pressure bleed-off A chemical cutting apparatus for use within a well bore is disclosed. The apparatus of the present invention includes a tubular casing adapted to be lowered into a well bore. The tubular casing contains an internal chamber containing a chemical cutting fl... | 11/04/1986 |
| 4619318 | Chemical cutting method and apparatus A downhold chemical cutting process for cutting a target object within a well. A source of a gaseous chemical cutting agent comprising a nitrogen fluoride is introduced into the well adjacent the target object and employed in a cutting operation in which ... | 10/28/1986 |
| 4613394 | Staged chemical pipe cutter Discloses an improved tool and method for cutting material by expelling a jet stream of liquid chemical reactant into forceful flowing connection and chemical reaction with a designated area of the material. Applies a force to at least one mass of reactan... | 09/23/1986 |
| 4603578 | Side entry sub with tension release wireline cable clamp Disclosed is a side entry sub with tension release wireline cable clamp. The side entry sub includes a tubular member having a port for the passage of the wireline cable into the interior of the tubular member. A cable clamp holder is positioned on the tu... | 08/05/1986 |
| 4562743 | Cable elongation measurement apparatus A cable elongation or relaxation measurement apparatus comprises an elongated beam having spaced apart clamp assemblies for forcibly clamping a section of cable under tension. One of the clamp assemblies is slidably mounted on a pair of parallel bearing r... | 01/07/1986 |
| 4558220 | Radioactivity well logging Method and apparatus for radiological investigation of subterranean multicomponent media such as borehole fluids, and subterranean earth formations. The formation under investigation or other medium is irradiated with penetrating radiation having a plural... | 12/10/1985 |
| 4523148 | Method and apparatus for determining the spontaneous earth potential log from downhole gradient measurements A method and apparatus for measuring the differential or gradient of an earth variable within a well bore (e.g., the spontaneous earth potential) and producing improved logs of this gradient or differential and its integral variable essentially free of an... | 06/11/1985 |
| 4506156 | Earth formation porosity determination with dual epithermal neutron detector system A method of determining the porosity of earth formations surrounding a wellbore despite shielding of that formation by well casing, cement or mud cake. The method includes producing fast neutrons in a wellbore and detecting a first epithermal neutron popu... | 03/19/1985 |
| 4502010 | Apparatus including a magnetometer having a pair of U-shaped cores for extended lateral range electrical conductivity logging A method of well logging in petroleum exploration and apparatus for use in the method as described. An improved magnetometer is disposed in a well bore to provide indications of the distribution, filimentation, and distortion of a controlled current flow ... | 02/26/1985 |
| 4494601 | Downhole chemical cutting tool A downhole chemical cutting tool having an improved cutting section. The tool comprises an elongated tool body adapted for insertion into a well bore and includes anchoring means actuatable between a deployed position in response to the application of flu... | 01/22/1985 |
| 4491178 | Through tubing bridge plug A bridge plug for use in plugging a well at a subterranean location and adapted to be set in place by insertion through a tubing string. The bridge plug comprises an elongated vent tube supporting upper and lower petal basket structures, each of which com... | 01/01/1985 |
| 4470335 | Method and apparatus for remote attachment A method and apparatus for remotely attaching one object to another object comprising: (a) a target consisting of layers of contrasting hardness attached to one object, wherein the outer layer is a relatively soft composition and the underlying base is a ... | 09/11/1984 |
| 4448248 | Enhanced flow tool positioner A well tool positioner is adapted for positioning the tool in a desired relation within a well pipe. The positioner includes a generally cylindrical resilient body adapted to be closely mounted around a tool with the major outside diameter of the body bei... | 05/15/1984 |
| 4428430 | Chemical method and apparatus for perforating drill collars Discloses a method and apparatus to help provide fluid pressure in a well bore sufficient to overcome in situ earth formation pressures by perforating a circulation port through the sidewall of a drill collar above the drill bit to provide circulation of ... | 01/31/1984 |
| 4415029 | Downhole well tool and anchoring assembly Downhole well tools and anchoring means therefore including a chemical cutting tool having improved slip actuating and slip array assemblies. The cutting tool includes a slip shaft provided with fluid passageway and having a slip array slidably disposed t... | 11/15/1983 |
| 4408927 | Threaded joint toggle-locked with a helical spring A resilient holding device comprising a looped helical spring or a closed loop of interconnected essentially circular disc elements confined to an annular cavity circumferentially within a threaded joint or coupling. By tightening the threaded joint or co... | 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 |
| 4385449 | Method and apparatus for measuring tilt and relative bearing An improved inclinometer and method for simultaneously measuring tilt and relative bearing in remote hostile environments such as oil and gas wells involving a pair of pendulum masses attached to perpendicularly intersecting shafts and individually capabl... | 05/31/1983 |
| 4345646 | Apparatus for chemical cutting A cylindrical downhole chemical jet cutting tool including a generally cylindrical slip body having pipe gripping slips connected to a co-axially disposed expandable piston-cylinder biased toward a retracted position by a return spring; each slip includes... | 08/24/1982 |
| 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 |
| 4315797 | Chemical pipe cutter with exponential spacing between reactant stages Discloses an improved tool and method for cutting material by expelling a jet stream of liquid chemical reactant into forceful flowing connection and chemical reaction with a designated area of the material. Applies a continuing force to a designated firs... | 02/16/1982 |
| 4302881 | Calibrated conduit caliper and method A well conduit caliper tool which simultaneously measures the remaining wall thickness of a well conduit in situ and the minimum inside diameter of such conduit. A caliper feeler arm element which extends out the furthermost distance from the caliper tool... | 12/01/1981 |
| 4292842 | Tool for testing earth formations in boreholes A tool for testing earth formations in bore-holes provides a failsafe function for retracting the sealing pad of the formation isolation device, in the form of elements operable in response to failure of down-hole power supply for the tool to effect relea... | 10/06/1981 |
| 4289024 | Well casing free-point indicator Improvement in free point indicators disclosed in U.S. Pat. No. 3,690,163. Discloses new strain sensing system having all electrical/electronic components, other than coil and diode components, located at earth's surface remote from high temperatures and ... | 09/15/1981 |
