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| Number | Title | Issue Date |
| 4867418 | Apparatus for increasing the load handling capability of support and manipulating equipment A method and apparatus for increasing the load handling capacity of a system, having at least one fluid driven compensating means, incorporates a booster fluid actuated piston cylinder assembly interconnecting portions of the compensating system so as to ... | 09/19/1989 |
| 4829176 | Logging apparatus and method A gamma radiation logging system utilizes a single fixed gamma ray source spaced from a plurality of detector means arranged in banks so that the readings of the detectors can be utilized individually and in combination to derive the formation density, mu... | 05/09/1989 |
| 4804051 | Method of predicting and controlling the drilling trajectory in directional wells The methods disclosed herein incorporate the basic concepts and methodologies of a new general rock-bit interaction model useful in predicting and controlling drilling trajectories in directional (and deep vertical) wells. It accounts for the anisotropic ... | 02/14/1989 |
| 4791797 | Density neutron self-consistent caliper Two downhole measurement-while-drilling tools, at least one of which is borehole sensitive, are used to make standard measurements of borehole conditions while drilling. From these measurements, and with some prior knowledge of the lithology, the caliber ... | 12/20/1988 |
| 4790393 | Valve for drilling fluid telemetry systems A mud pulse telemetry system for imparting data pulses to drilling fluids circulating in a drill string including an improved valve arrangement for modulating the pressure of the circulating drilling fluid is disclosed. A shear-type valve is arranged in a... | 12/13/1988 |
| 4785247 | Drill stem logging with electromagnetic waves and electrostatically-shielded and inductively-coupled transmitter and receiver elements An apparatus and method for measuring formation parameters by transmitting and receiving electromagnetic signals by antennas disposed in recesses in a tubular housing member and including apparatus for reducing the coupling of electrical noise into the sy... | 11/15/1988 |
| 4770387 | Variable ram seal for blowout preventers An improved blowout preventer of the ram type is provided with means allowing limited relative rotational movement of support elements in the seal along with radial inwardly directed movement of the ram assembly to conform to drill string size and accommo... | 09/13/1988 |
| 4759256 | Tensioner recoil control apparatus Apparatus for controlling fluid communication with a fluid pressure system includes parallel flow paths connected to the system. A first flow path includes first valve apparatus for selectively closing the flow path. The second flow path includes relief v... | 07/26/1988 |
| 4758357 | Dispersible hydrophilic polymer compositions for use in viscosifying heavy brines A thickening composition for use in viscosifying aqueous mediums, particularly heavy brines, comprising hydroxyethyl cellulose, 2-pyrrolidone and a mono alkyl ether of ethylene glycol which is water soluble and exerts no appreciable swelling effect on the... | 07/19/1988 |
| 4757873 | Articulated transducer pad assembly for acoustic logging tool The present invention is directed to an apparatus useful in downhole logging tools used in the oil and gas industry. The present invention is particularly directed to an acoustic logging tool including improved, articulated transducer pad assemblies for p... | 07/19/1988 |
| 4758371 | Process and composition for removal of mercaptans from gas streams A composition and process for the removal of mercaptans from gaseous mixtures, particularly gaseous mixtures containing hydrocarbons, wherein the gaseous mixture is treated with an aqueous solution of a water soluble nitrite, such as sodium nitrite, and a... | 07/19/1988 |
| 4756363 | Apparatus for releasing a perforation gun An improved apparatus for releasing a perforation gun from a tubing string in a well casing is disclosed. The explosion of a detonator that fires the perforation gun opens a previously sealed passageway through a wall of the apparatus of the invention. Th... | 07/12/1988 |
| 4756088 | Instruments for monitoring the direction of a borehole An instrument for monitoring the direction of a borehole comprises an elongate casing having its longitudinal axis coincident, in use, with the axis of the borehole, an outer gimbal pivotally mounted within the casing with its pivot axis coincident with t... | 07/12/1988 |
| 4748849 | Apparatus for dynamically measuring fluid loss characteristics An apparatus for testing fluid loss characteristics of a test fluid such as drilling mud under static or dynamic conditions, the apparatus having a filter medium cell which has a generally vertically disposed cylindrical wall, the apparatus further includ... | 06/07/1988 |
| 4747303 | Method determining formation dip The inclination and slope of a bedding plane are determined from oriented measurements of the bending moment generated as a bit encounters and passes completely through the interface between two dissimilar formations. These moments are distinguishable fro... | 05/31/1988 |
| 4736204 | Method and apparatus for communicating with downhole measurement-while-drilling equipment when said equipment is on the surface Communication with a measuring-while-drilling equipment sub, when the sub is at the surface, is established by placing a transmitter-receiver within transmitting range of the electrode/antenna array of the sub. The transmitter-receiver must be compatible ... | 04/05/1988 |
| 4733733 | Method of controlling the direction of a drill bit in a borehole A system for controlling the direction of a drill bit in a borehole utilizes both a drill string model and a bit-rock directional interaction model to compare ideal predicted or expected moments with real time measured moments to arrive at correction data... | 03/29/1988 |
| 4730281 | Data processing filtering method and apparatus A bucket brigade filter is disclosed having a feedback loop resulting in a tight comb structure filter response whereby a periodic noise and all its harmonics may be removed from a signal. Scalers featuring selectively variable scaler parameters permit pr... | 03/08/1988 |
| 4727946 | Rotary drill bits A rotary drill bit, for drilling wells in subsurface earth formations, and designed for rotation in a given direction, comprises a bit body having an internal passageway for drilling fluid. The bit body has an operating end face and at least one opening t... | 03/01/1988 |
| 4724866 | Speed control valve A speed control valve is formed with a pair of cooperating inversely operating dashpots to control movement of a valve element in either direction so as to prevent sudden actuation upon change in fluid velocity or oscillation due to fluid flow changes. Bl... | 02/16/1988 |
| 4725197 | Devices for imparting rotary motion A down-hole signal transmitter includes an annular impeller mounted on a cylindrical casing and arranged to be driven by the mud flow passing along a drill string. Each of the impeller and the casing incorporates two sets of magnets with their poles arran... | 02/16/1988 |
| 4723805 | Transloader A transloader provides means and method for adjusting multiple chains in an array for uniform tensioning. The transloader is mounted adjacent a reference member with chain adjustment rods passing through respective spring assemblies in a spring block. The... | 02/09/1988 |
| 4714403 | Down-hole devices for imparting rotary motion A down-hole signal transmitter includes an annular impeller mounted on a cylindrical casing and arranged to be driven by the mud flow passing along a drill string, and an annular stator fixed to the casing upstream of the impeller. The stator has blades c... | 12/22/1987 |
| 4711144 | Drill bit and method of manufacture The invention comprises a method of mounting a cutter, having a stud portion defining one end thereof and a cutting formation generally adjacent the other end, in a pocket in a drill bit body member. The method includes the steps of forming a channel exte... | 12/08/1987 |
| 4711143 | Rock bit assembly method In a method of assembling a roller cone type rock bit, on a body having a tool joint adjacent one end and at least one leg portion adjacent the other end, the leg portion is provided with a longitudinally outer surface which is inclined longitudinally inw... | 12/08/1987 |
| 4710906 | Method and system for monitoring the stability of boreholes The potential for failure of a formation is predicated by using standard logging apparatus and techniques to monitor the change in a formation characteristic over an extended time period. Changes in this characteristic are attributed to absorption of flui... | 12/01/1987 |
| 4708204 | System for determining the free point of pipe stuck in a borehole A system for determining the stuck point of pipe in a borehole including a wireline tool having an exciter coil and a receiver coil axially spaced from one another. The exciter coil is driven at a preselected low frequency and the voltage induced into the... | 11/24/1987 |
| 4705944 | Formation density logging while drilling A gamma ray density sub and method useful for measurement-while-drilling applications utilizing a gamma ray source and detector located on the rotating sub and computation of the product of the counting rates obtained from at least three locations in the ... | 11/10/1987 |
| 4697650 | Method for estimating formation characteristics of the exposed bottomhole formation The present invention is directed to an apparatus and method for estimating the value of a parameter of the formation face being penetrated by the drill bit in a drilling operation. The present invention is particularly useful for providing real-time, con... | 10/06/1987 |
| 4698501 | System for simultaneous gamma-gamma formation density logging while drilling A system for logging subterranean formations for the determination of formation density by using gamma radiation. Gamma ray source and detection means are disposed within a housing adapted for positioning within a borehole for the emission and detection o... | 10/06/1987 |
| 4694555 | Assemblies for supporting electrical circuit boards within tubes and method of using same An electrical circuit board is supported within a tube by means of an aluminum support spine of semicircular section. The circuit board is mounted on the flat surface of the spine with a continuous layer of vibration-absorbing material between the circuit... | 09/22/1987 |
| 4690805 | Process for removal of mercaptans from gas streams A composition and process for the removal of mercaptans from gaseous mixtures, particularly gaseous mixtures containing hydrocarbons, wherein the gaseous mixture is treated with an aqueous solution of a water soluble nitrite, such as sodium nitrite, and a... | 09/01/1987 |
| 4688764 | Crown block compensator Disclosed is a compensator applicable for use with a traveling block supported from a mast, derrick or the like by means of a crown block wherein the traveling block may be utilized for supporting objects. Two fluid pressure piston-and-cylinder assemblies... | 08/25/1987 |
| 4686051 | Method of increasing the rate of hydration of activated hydroxyethyl cellulose compositions A method of producing a well servicing fluid containing zinc bromide in which an activated hydroxyethyl cellulose is either admixed with a zinc bromide solution containing above about 30% by weight zinc bromide, or, in the alternative, is admixed with a n... | 08/11/1987 |
| 4686658 | Self-adjusting valve actuator The present invention is directed to an apparatus and method for actuating a valve. The present invention is particularly useful with a valve for imparting pressure pulses in a pressure pulse telemetry system. The present invention relates to an apparatus... | 08/11/1987 |
| 4681168 | Method and apparatus for running long tools into and out of a pressurized enclosure A method and apparatus for running long tools into an out of pressurized enclosures includes a tool stop assembled on an access pressure lock of the enclosure and which tool stop cooperates with a segmented tool string to allow sequential assembly, insert... | 07/21/1987 |
| 4676324 | Drill bit and cutter therefor A full bore drag-type well drilling bit comprises a bit body having an operating end face defining a plurality of upsets. Each of the upsets has a leading edge surface and at least one recess extending through the leading edge surface into the upset. The ... | 06/30/1987 |
| 4669556 | Drill bit and cutter therefor An elongate cutter for a drag-type drill bit includes a stud defining one end thereof and a cutting formation comprising a cutting face generally adjacent the other end. Length extends from one end to the other, depth extends generally transverse to the c... | 06/02/1987 |
| 4670164 | Liquid polymer containing compositions for thickening aqueous systems A liquid polymer containing composition, useful as a thickening agent for aqueous systems, containing hydroxyethyl cellulose, a hydrophobic liquid medium in which the hydroxyethyl cellulose is substantially non-swellable and a gelling agent for thickening... | 06/02/1987 |
| 4664820 | Preactivated organophilic clay gellant lubricating grease thickened with preactivated organophilic clay gellant and process for preparing preactivated organophilic clay gellants A preactivated organophilic clay gellant that may be used to thicken organic compositions, especially, lubricating greases without the presence of a polar activator. The preactivated organophilic clay gellant may be prepared using certain process paramete... | 05/12/1987 |
