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| Number | Title | Issue Date |
| 5172775 | Rotary drill bit insert A rotary drill bit insert including an elongated body rotatable about a central axis and having two halves symmetrical about the axis, each symmetrical half having a top surface including a planar front surface contiguous a noncoplanar back relief surface... | 12/22/1992 |
| 5131478 | Low friction subterranean drill bit and related methods A subterranean drill bit operable with a rotational drive source is provided for drilling in subterranean earthen materials to create a borehole having a borehole wall. The drill bit comprises a drill bit body having a base portion, a gauge portion and a ... | 07/21/1992 |
| 5119890 | Vibration dampened table bushing assembly for rotary drilling machines A table bushing is used with a rotary drilling machine of the type having a table through which a drill steel passes. The table bushing uses an automotive tire, or like resilient annular tube, to center the table bushing within an oversized hole in the ta... | 06/09/1992 |
| 5113952 | Auger planter method An auger planter is provided for forming small holes in the earth for the planting of flower bulbs and the like. The auger includes a central shaft and a single flighting having its leading and trailing ends truncated. When used, the single flighted auger... | 05/19/1992 |
| 5099928 | Non-polluting dispersing agent for drilling fluids based on freshwater or salt water A non-polluting dispersing agent for drilling fluids based on soft water or salt water. A dispersing agent for aqueous drilling fluids, optionally saline, belonging to the group of polymers and/or copolymers containing acid functions which is characterize... | 03/31/1992 |
| 5050691 | Detachable torque transmitting tool joint A device for transmitting torque from a power unit to a drill string or other rotary pipe, and which is constructed upon reverse rotation to preferentially break a threaded connection between the device and a stand of the pipe without disconnecting a plur... | 09/24/1991 |
| 5042596 | Imbalance compensated drill bit An imbalance compensated drill bit is disclosed that takes advantage of undesired and destructive imbalance forces to prevent bit whirl. Methods of designing and making such imbalance compensated drill bits are disclosed whereby a drill bit body has at le... | 08/27/1991 |
| 5035293 | Blade or member to drill or enlarge a bore in the earth and method of forming A blade for a member that is supported on a rotatable well string to position the blade in operating position to engage and drill a well bore or enlarge a well bore. The blade has a bottom and side surface each with leading and trailing edges. Cutting ele... | 07/30/1991 |
| 5031540 | Apparatus for severing tubular members The invention relates to an apparatus for severing tubular members and is provided with a carrier, which carries a sparging assembly and an explosive assembly downwardly into the tubular member to be severed. The outlet of the sparging assembly is below t... | 07/16/1991 |
| 5027911 | Double seal with lubricant gap between seals for sealed rotary drill bits This invention relates to a rotary drill bit having a body with leg members, where each of the leg members has a projecting conical cutter receiving journal. A conical cutter having an axially extending recess open at one end has friction reducing bearing... | 07/02/1991 |
| 5025871 | Drilling method and rotary drill bit crown A rotatable crown for a rotary drill comprising a working end and an opposite end for engagement in a drill rod, stringer or adaptor coupling, the working end having a cutting face and a plurality of discrete, spaced, elongate cutting elements located in ... | 06/25/1991 |
| 5020609 | Acceleration compensating system In the preferred application, an acceleration compensation mass is supported in a downhole drilling related housing for independent movement along an axis in response to acceleration of the housing. A control member that moves relative to the housing in a... | 06/04/1991 |
| 5007487 | Method and apparatus for making drill holes under spatially restricted conditions For making drill holes, in particular under cramped conditions, an apparatus is used which comprises a drill rod consisting of individual segments and guided in the cradle or slide. The individual segments comprise end pieces which are constructed as cent... | 04/16/1991 |
| 4982802 | Method for stabilizing a rotary drill string and drill bit Apparatus for stabiliing a rotary drill string and drill bit used to drill a borehole in a material, such as a subterranean formation, includes an imbalanced drill collar and a drill bit connected to the drill collar. The imbalanced drill collar creates a... | 01/08/1991 |
| 4976322 | Method of construction of multiple-string wells The method of well construction includes the steps of drilling the rock and consolidating it with a conductor casing, a surface casing string and a flow string, and isolating the troublesome zones of the well with profile pipes being reamed in the course ... | 12/11/1990 |
| 4924951 | Manhole cutter Manhole cutter for cutting a circular groove of a fixed depth about a manhole, such as in a street, and removing the manhole from the street. The manhole cutter is suspended from a front-end loader or truck-mounted boom and rotated hydraulically from a po... | 05/15/1990 |
| 4913243 | Percussion drill and method of controlling same A percussion drill provided with additional control phases in the form of a gentle braking phase for controlling the rearward movement, and a progressive braking phase for controlling forward movement. To this end, the control slide valve of the drill has... | 04/03/1990 |
| 4904119 | Process for placing a piling in the ground, a drilling machine and an arrangement for implementing this process The invention is a method for installing a piling of a predetermined target depth in the ground, particularly on the ocean floor. A pipe is lowered into the ground together with a drilling machine having rotatable cutters movable from a first position in ... | 02/27/1990 |
| 4902430 | Method for cleaning certain estuaries, harbors, and lakes An arrangement for removing toxic sedimentary material (101) from a large dy of water (102) by forming a large number of core holes (100) in at least the sediment layer (101); inserting sediment trap receptacles (200) in the core holes (100); allowing the... | 02/20/1990 |
| 4874045 | Straight hole drilling method and assembly A drilling assembly comprises a matched bit and stabilizer in which the maximum outer diameter of the bit and stabilizer have been measured and machined to be within predetermined tolerances. The maximum stabilizer diameter is in the range of 0.003-0.025 ... | 10/17/1989 |
| 4869329 | Rock bit insert A new and improved tungsten carbide insert for rock bits is disclosed, in which the inserts are subject to extended vibratory tumbling in order to increase their fracture toughness. More specifically the vibratory finishing or tumbling of the inserts has ... | 09/26/1989 |
| 4865135 | Top drive torque reactor A torque reactor for a top drive drilling rig converts reactive torque on the top drive housing into a rotational torque on a torque shaft. The torque shaft extends vertically in the derrick parallel with the drive stem. A torque case carries two bushings... | 09/12/1989 |
| 4850439 | Method and a drilling rig for drilling a bore well Drilling equipment, especially for offshore use, comprises a drill floor or platform (11) with a derrick (10) extending upwards therefrom. A first hoist (12) connected to the upper part of the derrick is used for passing a length of a tubular body (19), s... | 07/25/1989 |
| 4844839 | In situ treatment and analysis of wastes Hazardous wastes are identified and treated in situ by forming a downwardly extending zone of particles in the waste. Toxic components in the waste are identified by injection of a pressurized fluid into the zone and capturing a sample of gases rising to ... | 07/04/1989 |
| 4836300 | Method of performing drilling operations from a derrick The crown block has two parallel clusters of sheaves. In one use the crown block is positioned such that the center of the derrick passes through the axle of one of the clusters and a power cable is threaded through the first cluster of the crown block an... | 06/06/1989 |
| 4832137 | Method for protecting a pipe casing from a drill pipe string An improved method for protecting a drill pipe casing from a rotatable string of drill pipe longitudinally extended therethrough. The method involves positioning a collar structure circumferentially around the upper end of one pipe section which is intern... | 05/23/1989 |
| 4832136 | Drill bit and roller cutter for said drill bit A drill bit has a plurality of roller cutters mounted on a front face of the drill bit. The roller cutters are mounted in pairs which are equidistantly spaced from an axis of rotation of the drill bit. Each roller cutter is rotatably mounted in a saddle a... | 05/23/1989 |
| 4830121 | Break-out joint with selective disabler A device for reducing the break-out torque in a drill pipe tool joint selectively can be disabled so that break-out is at standard torque. The torque reducing device includes a collar located on the pin. The collar has a makeup shoulder that makes up agai... | 05/16/1989 |
| 4821816 | Method of assembling a modular drilling machine A drilling machine includes a drilling substructure skid which defines two spaced parallel skid runners and a platform. The platform supports a draw works mounted on a draw works skid, and a pipe boom is mounted on a pipe boom skid sized to fit between th... | 04/18/1989 |
| 4793422 | Articulated elevator links for top drive drill rig An apparatus for a top drive drill rig lifts a stand of the drill pipe into engagement with the drive stem in the derrick. The apparatus includes a set of elevators mounted between the drive head by a link assembly. The link assembly includes two link sec... | 12/27/1988 |
| 4791997 | Pipe handling apparatus and method A pipe handling apparatus for a drilling rig is mounted on the rig floor. The drilling rig has a top drive with a power drive stem. Elevators are suspended below the drive stem. The lifting member has a supporting arm to receive the bottom of a stand of d... | 12/20/1988 |
| 4788467 | Downhole oil well vibrating system A transducer assembly includes a piezoelectric transducer and a support member encasing the transducer. The transducer and the support member may have commonly disposed openings. The support member has a progressively increasing thickness at progressive p... | 11/29/1988 |
| 4787464 | Variable rake mine tool insert and method of use A mine tool roof bit insert having a leading face inclined at a constant angle of 0°-3° with respect to the axis of rotation, and a frontal face with a variable relief angle decreasing with increasing radial distance from the axis from 25°-55° at the ... | 11/29/1988 |
| 4776409 | Insitu waste impoundment treating apparatus and method of using same An apparatus (U) is shown in FIGS. 11-13 that includes a power operated vehicle (V) that supports a vertically movable frame (W) that has a confined space defining shroud (X) on the lower end thereof that may be placed in sealing contact with the upper su... | 10/11/1988 |
| 4770256 | Soil drilling Soil drilling tools are provided with at least two sidewardly movable plate members adapted to exert pressure on the wall of a bore hole to prevent a cave in.... | 09/13/1988 |
| 4751971 | Automatic augering device and method A mobile automatic augering device, capable of augering a hole, entrapping a volume of earth removed from the hole to create a work space above the hole, and then backfilling the hole with the removed earth is disclosed. The present invention is character... | 06/21/1988 |
| 4750571 | Screen placement method and apparatus A screen placement apparatus and system wherein the apparatus includes a motor for providing rotational torque to an auger received within a ground screen and a disposable cutting tip having a cutting diameter equal to or greater than the outer diameter o... | 06/14/1988 |
| 4696352 | Insert for a drilling tool bit and a method of drilling therewith A coated insert for such drilling tool bits as mine tool roof bits or masonry drill bits. A hard, fracture resistant substrate is coated with one or more thin adherent layers of refractory coating material. The material of each layer is a carbide, nitride... | 09/29/1987 |
| 4658915 | Easy break-out tool joint and method An easy break-out tool joint (10) (two embodiments) comprising a drive spindle (stem), or sub (12, 12a) having a shoulder ring (32, 32a) whose shoulder (34) is axially movable but rotatable with the sub (12, 12a) to form a conventionally shouldered (34, 5... | 04/21/1987 |
| 4646853 | Shaft boring machine and method A shaft boring machine including a rotatable cutterwheel assembly with a horizontal axis mounted on a carriage having vertical travel. The carriage is mounted on a slewing base frame and rotates about the vertical axis of the machine. An excavating unit f... | 03/03/1987 |
