| Patents for E21B 43 - Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (64,186) |
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| 09/26/1989 | CA1260759A1 Bi-phased fluid pump feeder device, and hydrocarbon production installation using said device |
| 09/26/1989 | CA1260252A1 Ether-amine oxides, a process for their preparation, and their use as surfactants for tertiary oil recovery |
| 09/26/1989 | CA1259907A1 Gravel packer |
| 09/26/1989 | CA1259906A1 Method and apparatus for hydraulically releasing from a gravel screen |
| 09/21/1989 | WO1989008768A1 Method for enhanced recovery of hydrocarbone |
| 09/20/1989 | EP0332645A1 Method and apparatus for reduction of the pressure in a liquid mixture. |
| 09/20/1989 | CN2044641U Underground hot collector for oil-well pump |
| 09/20/1989 | CN1035702A New method of increasing productivity of crude oil-marfua method |
| 09/19/1989 | US4867645 Double diaphragm pressure switch for a well water system |
| 09/19/1989 | US4867605 Method and apparatus for retrieving a running tool/guideframe assembly |
| 09/19/1989 | US4867242 Method and apparatus for breaking gas lock in oil well pumps |
| 09/19/1989 | US4867241 Limited entry, multiple fracturing from deviated wellbores |
| 09/19/1989 | US4867238 Recovery of viscous oil from geological reservoirs using hydrogen peroxide |
| 09/19/1989 | US4866939 Method and apparatus for extracting geothermal fluid |
| 09/19/1989 | CA1259732A1 Salt enhanced dilution of a gel-like aqueous polymer solution |
| 09/19/1989 | CA1259685A1 Process and apparatus for monitoring and controlling the flammability of gas from an in-situ combustion oil recovery project |
| 09/19/1989 | CA1259564A1 Carbon dioxide injection with in situ combustion process for heavy oils |
| 09/19/1989 | CA1259563A1 Horizontal wells at corners of vertical well patterns for improving oil recovery efficiency |
| 09/19/1989 | CA1259562A1 Modified 7 spot patterns of horizontal and vertical wells for improving oil recovery efficiency |
| 09/19/1989 | CA1259561A1 Borehole devices disarmed by fluid pressure |
| 09/19/1989 | CA1259560A1 Annulus pressure firer mechanism with releasable fluid conduit force transmission means |
| 09/19/1989 | CA1259477A1 Steam foam process |
| 09/19/1989 | CA1259476A1 Alkali-enhanced steam foam oil recovery process |
| 09/19/1989 | CA1259475A1 Steam-foaming surfactant mixtures which are tolerant of divalent ions |
| 09/13/1989 | EP0332002A2 Use of selected acrylic and/or methacrylic acid ester copolymers as flow enhancers in paraffin-rich mineral oils and mineral-oil fractions (II) |
| 09/13/1989 | EP0332000A2 Use of selected acrylic and/or methacrylic acid ester copolymer versions as flow enhancers in paraffin-rich mineral oils and mineral-oil fractions (I) |
| 09/12/1989 | US4865131 Method and apparatus for stimulating hydraulically pumped wells |
| 09/12/1989 | US4865128 Gravel packing system for a production radial tube |
| 09/12/1989 | CA1259254A1 Method of recovering oil |
| 09/12/1989 | CA1259224A1 Gas-lock breaking device |
| 09/12/1989 | CA1259166A1 Process for drilling geothermal wells with removal of h.sub.2s |
| 09/06/1989 | EP0331295A1 Pipeline system to separate at least a two-phase fluid flow |
| 09/06/1989 | CN2044002U Gas-liquid mixing flow distributor |
| 09/06/1989 | CN1035339A Pressurized water-filling method for well and its equipment |
| 09/05/1989 | US4863618 Oil recovery with water containing carbonate salt, CO2, and surfactant |
| 09/05/1989 | US4862966 Liner hanger with collapsible ball valve seat |
| 09/05/1989 | US4862964 Method and apparatus for perforating well bores using differential pressure |
| 09/05/1989 | US4862962 Matrix treatment process for oil extraction applications |
| 09/05/1989 | US4862957 Packer and service tool assembly |
| 08/30/1989 | EP0330584A1 Divice for transferring fluids between the sea bottom and the surface |
| 08/30/1989 | EP0330489A2 Method for reducing the viscosity of aqueous fluids |
| 08/30/1989 | CN2043665U Light energy-saving oil-pumping machine |
| 08/29/1989 | US4861384 Fluid removal cannister device |
| 08/29/1989 | US4861263 Method and apparatus for the recovery of hydrocarbons |
| 08/29/1989 | US4861196 Offshore drilling/production platform with a retractable work deck |
| 08/29/1989 | US4860831 Well apparatuses and methods |
| 08/29/1989 | US4860830 Method of cleaning a horizontal wellbore |
| 08/29/1989 | US4860828 Gas flooding processing for the recovery of oil from subterranean formations |
| 08/29/1989 | US4860827 Process and device for oil recovery using steam and oxygen-containing gas |
| 08/29/1989 | US4860825 Device for positioning a tool or instrument in a duct |
| 08/29/1989 | US4860655 Implosion shaped charge perforator |
| 08/29/1989 | US4860654 Implosion shaped charge perforator |
| 08/23/1989 | EP0328993A1 Apparatus for the expulsion of light volatile pollutants from ground water |
| 08/23/1989 | CN1034973A Method of isolation of troublesorne zones in well with profile patch liners |
| 08/22/1989 | US4858691 Gravel packing apparatus and method |
| 08/22/1989 | US4858690 Upward movement only actuated gravel pack system |
| 08/22/1989 | US4858689 Coal gasification well drilling process |
| 08/22/1989 | US4858644 Fluid flow regulator |
| 08/22/1989 | CA1258620A1 Offshore hydrocarbon production system |
| 08/22/1989 | CA1258619A1 Recovering oil by injecting hot co.sub.2 into a reservoir containing swelling clay |
| 08/16/1989 | CN2042882U Calculation type magnetic jet injector |
| 08/16/1989 | CN2042881U Wheel axle distance incresement type pumping unit |
| 08/16/1989 | CN2042880U Diversion adapter |
| 08/15/1989 | US4858130 Estimation of hydraulic fracture geometry from pumping pressure measurements |
| 08/15/1989 | US4856591 Method and apparatus for completing a non-vertical portion of a subterranean well bore |
| 08/15/1989 | US4856590 Process for washing through filter media in a production zone with a pre-packed screen and coil tubing |
| 08/15/1989 | US4856589 Gas flooding with dilute surfactant solutions |
| 08/15/1989 | US4856588 Selective permeability reduction of oil-free zones of subterranean formations |
| 08/15/1989 | US4856587 Recovery of oil from oil-bearing formation by continually flowing pressurized heated gas through channel alongside matrix |
| 08/15/1989 | US4856586 Xanthan biopolymer and polyacrylamide crosslinked with bisacrylamide |
| 08/15/1989 | CA1258421A1 Buffered steam drive oil recovery process |
| 08/10/1989 | DE3901921A1 Rodless multi-hole drilling and cutting unit |
| 08/10/1989 | DE3802723A1 Pit well |
| 08/09/1989 | EP0327432A2 Process and device for hydraulically and selectively controlling at least two tools or instruments of a device, valve for carrying out this method or for using this device |
| 08/09/1989 | EP0326720A1 Method of removing polymer gels from a petroleum reservoir |
| 08/09/1989 | CN2042511U Rotary oil-discharge apparatus |
| 08/09/1989 | CN2042510U Double-well big-amplitude beam-type oil-pumping unit |
| 08/08/1989 | US4855050 Centrifugal oil separator for removing oil from a waste flowing stream |
| 08/08/1989 | US4854386 Method and apparatus for stage cementing a liner in a well bore having a casing |
| 08/08/1989 | US4854385 Injecting surfactant, flow control agent, and drive fluid |
| 08/03/1989 | DE3801933A1 Method for absorbing geothermal energy using flowing water |
| 08/02/1989 | EP0326492A1 Device and method for carrying out operations and/or interventions in a well |
| 08/02/1989 | EP0325848A1 Method and apparatus for perforating a well |
| 08/01/1989 | US4852653 Using a sulfonate surfactant |
| 08/01/1989 | US4852652 Using an acrylamide polymer |
| 08/01/1989 | US4852651 Polydialkylsilalkylene polymer useful in enhanced oil recovery using carbon dioxide flooding |
| 08/01/1989 | US4852650 Silicon carbide or nitride;enhanced oil recovery |
| 08/01/1989 | US4852647 Wire line hold down device |
| 08/01/1989 | US4852495 Shaped charge detonating cord retainer arrangement |
| 08/01/1989 | US4852494 Explosively actuated switch |
| 07/27/1989 | WO1989006739A1 Method of constructing a well |
| 07/26/1989 | EP0325412A2 Metal well screen assembly with plastic end fitting and method of attaching same |
| 07/26/1989 | CN2041725U Dual-well traveling block and falls beam-pumping unit |
| 07/26/1989 | CN1034237A Subsea template and method for using the same |
| 07/26/1989 | CN1034218A Clay-swelling preventer for petroleum recovery and its prepn. method |
| 07/25/1989 | US4851665 System for sensing ions in aqueous solution |
| 07/25/1989 | US4850750 Integrated blending control system |
| 07/25/1989 | US4850743 Template levelling device |
| 07/25/1989 | US4850702 Method of blending materials |
| 07/25/1989 | US4850438 Modular perforating gun |