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| Number | Title | Issue Date |
| 6308780 | Method for regaining mud circulation in operating well and device for its embodiment Run into a well, e.g., in a tube, on a pipe string is a hydromechanical cleaner. The bridge is washed out by the direct desending flow of drilling mud pumped through the pipe string 2. The cleaner is moved downward as the bridge is washed out by moving th... | 10/30/2001 |
| 5549160 | Downhole progressing cavity pump rotor valve An apparatus and method for plugging a tubing string of a fluid producing well below a sucker rod driven progressing cavity type pump uses a valve means inside of the tubing string below the pump, the valve means being actuatable by displacing the rotor o... | 08/27/1996 |
| 5492174 | Rod guide with enhanced erodable volume A rod guide molded in intimate contact with a sucker rod increases the amount of rod guide material available for wear. Adequate bypass area is provided so as not to impede the efficient movement of the rod and guide in tubing, yet more material for wear ... | 02/20/1996 |
| 5479988 | Mud check valves in drilling apparatus (wells) A check valve for connection with the top end of a drillstring as a mud saver comprises a tubular valve member (18) which is axially shiftable within a tubular body (10) through a sleeve seal (19) which is mounted in the body (10) and which cooperates wit... | 01/02/1996 |
| 5474142 | Automatic drilling system An automatic drilling system regulates the drill string of a drilling rig in response to any one of, any combination of, or all of drilling fluid pressure, bit weight, drill string torque, and drill string RPM to achieve an optimal rate of bit penetration... | 12/12/1995 |
| 5474127 | Annular safety system for oil well An annular safety system for an oil well. The annular safety system is in the form of a hanger mechanism. The hanger mechanism is particularly effective in an oil well equipped for gas lift operation where gas is injected into an annular space between the... | 12/12/1995 |
| 5469925 | Downhole tube turning tool A tube turning tool allows laterals to be drilled and completed without the need for articulated bending tools, underreaming, high fluid pressure, or a separate running of completion tools. The turning tool uses a rigid bent pipe section capable of being ... | 11/28/1995 |
| 5467833 | System for lifting tubulars and equipment below the main deck of platforms Apparatus is provided for lifting equipment or tubulars below the deck of a platform or a drilling rig. Lifting force is monitored with a load cell. A portable platform is added above the deck of an offshore platform to allow running or retrieving a strin... | 11/21/1995 |
| 5467834 | Method and apparatus for short radius drilling of curved boreholes A method and apparatus for the drilling of the curved borehole portion of a horizontal or directional well. A tight radius of curvature is rotary drilled by use of flexible composite drilling pipe or other flexible pipe common to the industry which termin... | 11/21/1995 |
| 5465799 | System and method for precision downhole tool-face setting and survey measurement correction A method determining a tool face angle of a downhole drilling assembly in a well bore including the steps of determining an apparent tool face angle, measuring torque at least at one downhole axial location along the drillstring in the well bore, correlat... | 11/14/1995 |
| 5462129 | Method and apparatus for erosive stimulation of open hole formations There is described an improved apparatus and method of treating a section of unlined well bore comprising the steps of establishing a flow path from the top of the well bore to a location opposite the section of unlined well bore to be treated, pumping an... | 10/31/1995 |
| 5462128 | Cutter bit for use in drilling operations Disclosed is a cutter bit (1) for use in drilling operations comprising a body (10) having a top portion (11) and a bottom portion (12), the bottom portion (12) being provided with cutting elements for cutting a formation to which the cutting elements is ... | 10/31/1995 |
| 5460223 | Method and system for oil recovery A method and an apparatus for recovering oil from a oil bearing formation having a mixture of oil and water. A first borehole and a second borehole are formed in oil bearing .formation and extend in a horizontal direction. The first borehole is disposed b... | 10/24/1995 |
| 5460231 | Device and method for augering a conical hole in solid media A device for augering a conical hole in a solid medium that includes a first elongated member that extends along a longitudinal axis and a cutting blade having a cutting section and a non-cutting section coupled to the first elongated member. The rod is a... | 10/24/1995 |
| 5458196 | Through tubing gun hanger A gun hanger for emplacement through a tubing string into a casing string, comprising an inner mandrel, a setting means slidably received on said mandrel, said setting means including a plurality of spaced apart, extendable slips mounted thereon such that... | 10/17/1995 |
| 5458198 | Method and apparatus for oil or gas well cleaning An oil or gas well cleaning method includes inserting tubing, such as a coiled tubing, into a well bore, for example, into a production pipe in a well bore. A cleaning fluid containing a flocculant is passed into the well and the flocculant in the cleanin... | 10/17/1995 |
| 5456314 | Wellhead annulus seal A seal for a wellhead housing employs a locking groove. The seal is of a U-shape, having an inner and outer radially spaced apart legs. An energizing ring is stroked downward to force the legs apart to cause them to seal between the wellhead housing in th... | 10/10/1995 |
| 5456326 | Apparatus and method for installing open-ended tubular members axially into the earth An apparatus and a method for installing open-ended tubular members axially into the earth by simultaneously or sequentially driving, drilling, and jetting. A drilling string assembly is located inside the tubular member, but is supported independently fr... | 10/10/1995 |
| 5454420 | Method and apparatus for rotating downhole tool in wellbore A wellbore operation in which a downhole tool is given rotary motion without rotating the tubing string to which it is attached. A "Yankee screwdriver" type of connecting element is used to connect a downhole tool to a tubing string so that compressive fo... | 10/03/1995 |
| 5454436 | Method of warning of pipe sticking during drilling operations A method of warning of the onset of pipe sticking in a rotary drilling operation using a drill string comprising: (a) monitoring the pressure of a drilling fluid being pumped through the drill string during drilling over predetermined periods of time to o... | 10/03/1995 |
| 5452760 | Well pump tubing scrapers A well pump sucker rod scraper arrangement that includes a sucker rod, scrapers fixed to said rod and a scraper at spaced apart positions movably mounted on said rod, between adjacent pairs of the fixed scrapers. The movable and fixed scrapers each have s... | 09/26/1995 |
| 5452763 | Method and apparatus for generating gas in a drilled borehole The present apparatus and method utilizes a downhole electrolysis process implemented by means of an elongated gas generating apparatus containing an array of cascaded electrolysis cells distributed along all or part of the borehole length to be fractured... | 09/26/1995 |
| 5450904 | Adjustable tieback sub A method of tensioning casing between a subsea well and a surface wellhead employs an adjustment sub. The adjustment sub has upper and lower portions connected together by a threaded section. The running tool locates within the adjacent sub and is employe... | 09/19/1995 |
| 5450901 | Apparatus and process for producing and reinjecting gas An apparatus and process for separating and producing gas and liquid from a subterranean production zone via a well in fluid communication with the zone. After separation in the well, the gas is produced to the surface, compressed, and injected into an in... | 09/19/1995 |
| 5449045 | Drive point device Described is a device for driving into the ground which includes a drive point, a fluid passage section, an annular seal and an annular drive rod. The annular seal is the widest member and fits snugly in a borehole formed after the device is driven into t... | 09/12/1995 |
| 5449047 | Automatic control of drilling system A blasthole drill is provided with sensors for sensing the pressure (AP) applied to and through a drill bit to convey cuttings from the drill hole, the rate of rotation (N) of the drill bit, the torque (RT) required to rotate the bit, the force (FB) appli... | 09/12/1995 |
| 5447196 | Hydraulic jar There is disclosed a double-acting hydraulic jar having upper and lower detent pressure chambers having upper and lower restrictions, respectively, formed on the inner diameter of its outer tubular member and through which upper and lower detent means car... | 09/05/1995 |
| 5445229 | Method and apparatus for drilling, cracking, and withdrawing earth cores A method and apparatus for drilling, cracking, and withdrawing solid each cores, the method commencing with coring the earth using a conventional rotary core drill (20). The core drill is withdrawn to leave an attached earth core (26) and a drilled core g... | 08/29/1995 |
| 5445225 | Choke for enhanced gas and oil well production The claimed apparatus is a bottom hole choke device for regulating the flow within gas and oil producing wells. The apparatus includes a screen for preventing sand from entering the production string, a flow-restricting choke, and a check valve for preven... | 08/29/1995 |
| 5443121 | Gravel-packing apparatus & method A gravel-packing apparatus and method is disclosed which involves a movable sleeve over a screen. The screen is fixed to a packer downhole while the sleeve is operated from the surface. As the sleeve is lifted to expose more of the screen, the granular ma... | 08/22/1995 |
| 5443124 | Hydraulic port collar A stage valve with particular use in cementing a well bore annulus where the stage valve has pressure operated valve member for opening a flow passage in the stage valve and the valve member has differential pressure areas which maintain the valve member ... | 08/22/1995 |
| 5443129 | Apparatus and method for orienting and setting a hydraulically-actuatable tool in a borehole An apparatus for detecting and properly orienting a hydraulically-actuatable tool in a borehole and commencing drilling in a single trip of the drill string includes an MWD subassembly, for sensing the orientation, and a bypass valve for setting the ... | 08/22/1995 |
| 5439061 | Adjustable surface well head casing hanger A surface wellhead system for a subsea well utilizes a two-piece casing hanger. The casing hanger has an inner member that secures to a string of casing that extends from the sea floor to a surface casing head. The outer member of the casing hanger is axi... | 08/08/1995 |
| 5439067 | Rock bit with enhanced fluid return area A rotary cone drill bit for forming a borehole having a one-piece bit body with a lower portion having a convex exterior surface and an upper portion adapted for connection to a drill string. A number of support arms are preferably attached to the bit bod... | 08/08/1995 |
| 5439051 | Lateral connector receptacle A novel lateral connector receptacle or LCR is provided which functions to (1) provide means for running a lower completion into a well; (2) provide means for orienting a retrievable whipstock assembly and/or scoophead diverter; and (3) provides means for... | 08/08/1995 |
| 5439053 | Reinforcing slat for inflatable packer A reinforcing slat for use in an inflatable packer which is elongate and curved about its longitudinal axis and comprises perforations in the part thereof which enters the end portion and which bends around the end portion on inflation of the packer. The ... | 08/08/1995 |
| 5437343 | Diamond cutters having modified cutting edge geometry and drill bit mounting arrangement therefor A diamond cutting element including a substantially planar diamond table having a periphery defined by a multiple chamfer. The angle of the outermost chamfer may be oriented to provide a bearing surface on the cutting element at the place of engagement wi... | 08/01/1995 |
| 5437330 | Liner cementing system and method A liner cementing system and method provide for a landing collar 10 with a bypass passageway 45. Circulation port 62 in collar 10 permits initial circulation through the liner 17 until a pump down plug P1 is pumped therein to seal off circulation therethr... | 08/01/1995 |
| 5435385 | Integrated wellhead tubing string In one form of the invention, an integrated wellhead tubing string (100) having a reduced overall height is disclosed, comprising an integrated casing (104) having a first vertical bore (110) therethrough having a first inside diameter, a second vertical ... | 07/25/1995 |
| 5435390 | Remote control for a plug-dropping head An apparatus and method of dropping a pumpdown plug or ball is revealed. The assembly can be integrally formed with a plug-dropping head or can be an auxiliary feature that is mounted to a plug-dropping head. The release mechanism is actuated by remote co... | 07/25/1995 |
