| 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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| 07/19/1988 | US4757863 Well cleaning method and apparatus |
| 07/19/1988 | CA1239441A1 Method and apparatus for data transmission in a well using a flexible line with stiffener |
| 07/14/1988 | WO1988005110A1 Method and device for taking measurements and/or carrying out interventions in a well subjected to a hydraulic compression |
| 07/14/1988 | WO1988005109A1 System for moving a set of instruments and measurements and/or interventions method in a well |
| 07/13/1988 | EP0274139A1 Process for selectively treating a subterranean formation using coiled tubing without affecting or being affected by the two adjacent zones |
| 07/13/1988 | CN87215341U Submerged excavation machine |
| 07/13/1988 | CN87207638U Automatic torque-change-over oil pump |
| 07/13/1988 | CN87108028A Method and apparatus for reduction of pressure in liquid mixture |
| 07/13/1988 | CN87107394A Well completion process using polymer gel |
| 07/12/1988 | US4757098 Contains chelate agent stabilizer comprising for example ethylenediamine, nitrilotriacetic acid, ethylenediamine tetraacetic acid, 1,2-cyclohexylenediaminetetraacetic acid |
| 07/12/1988 | US4756887 Injecting leaching solution into wells formed in heap containing ore |
| 07/12/1988 | US4756371 Perforation apparatus and method |
| 07/12/1988 | US4756369 Method of viscous oil recovery |
| 07/12/1988 | US4756368 Method for drawing up special crude oil |
| 07/12/1988 | US4756367 Method for producing natural gas from a coal seam |
| 07/12/1988 | US4756363 Apparatus for releasing a perforation gun |
| 07/12/1988 | CA1239088A1 Method for controlling water coning in oil wells |
| 07/06/1988 | EP0273662A2 Natural tracer for secondary recovery water injection process |
| 07/06/1988 | CN87214883U Wobble wheel length-increasing long stroke oil-pumping machine |
| 07/05/1988 | US4755082 Load transfer system for an offshore structure mounted to a subbase |
| 07/05/1988 | US4755081 Reduced J-tube pull force |
| 07/05/1988 | US4754817 Subsea well template for directional drilling |
| 07/05/1988 | US4754811 Controlled retracting gasifying agent injection point process for UCG sites |
| 07/05/1988 | US4754808 Methods for obtaining well-to-well flow communication |
| 07/05/1988 | US4754807 Sand screen for production oil wells |
| 07/05/1988 | CA1238850A1 Method for recovering hydrocarbons from fractured or highly stratified low viscosity subsurface reservoirs |
| 07/05/1988 | CA1238849A1 Method and device enabling the taking of measurements and/or the undertaking of operations within a well |
| 06/30/1988 | WO1988004718A1 Well completion process using a polymer gel |
| 06/29/1988 | EP0273024A2 Method of producing methane by underground coal gasification |
| 06/29/1988 | EP0272770A2 Tubular connector |
| 06/28/1988 | US4753666 Distillation, injection of overhead stream into hydrocarbon bearing formation |
| 06/28/1988 | US4753552 Dry and/or wet one-atmosphere underwater system |
| 06/28/1988 | US4753485 Recovering minerals from a subsurface earth formation |
| 06/28/1988 | US4753301 Well perforating gun assembly |
| 06/28/1988 | US4753295 Method for placing ball sealers onto casing perforations in a deviated portion of a wellbore |
| 06/28/1988 | US4753293 In-situ condensation of hydrocarbon solvent vapors mixed with water vapor causing flow of oil |
| 06/28/1988 | US4753170 Polygonal detonating cord and method of charge initiation |
| 06/28/1988 | CA1238572A1 Thermal recovery method for viscous oil |
| 06/22/1988 | EP0271569A1 Downhole electric heating generator for producing steam or hot water |
| 06/22/1988 | EP0185727B1 Underwater operating system |
| 06/22/1988 | CN87215505U Pressure breaking bullet |
| 06/21/1988 | US4751966 Ignition propellants to provide energy, hydrocarbon recovery |
| 06/21/1988 | CA1238268A1 Method for improved oil recovery |
| 06/21/1988 | CA1238198A1 Offshore structure for deepsea production |
| 06/21/1988 | CA1238193A1 Batch leaching process |
| 06/16/1988 | WO1988004353A1 Improvements relating to installation of downhole pumps in wells |
| 06/16/1988 | WO1988004352A2 Process for making a well |
| 06/15/1988 | EP0271284A2 Stimulation of earth formations surrounding a deviated wellbore by sequential hydraulic fracturing |
| 06/15/1988 | CN87213982U Safety cover for crank of oil extracting machine |
| 06/15/1988 | CN87107730A Dual balance serial oil pump driven by hydraulic motor |
| 06/14/1988 | US4750983 For electrodialysis |
| 06/14/1988 | US4750571 Screen placement method and apparatus |
| 06/14/1988 | US4750562 Method to divert fractures induced by high impulse fracturing |
| 06/14/1988 | US4750561 Gravel packing system for a production radial tube |
| 06/14/1988 | US4750557 Well screen |
| 06/14/1988 | CA1238012A1 Apparatus for the treatment of water |
| 06/14/1988 | CA1237981A1 Underwater production station unit and wellhead shield |
| 06/14/1988 | CA1237980A1 Carbon dioxide miscible displacement process |
| 06/13/1988 | EP0238491A4 Cyclone separator. |
| 06/08/1988 | CN86107994A Pressure crude-oil production machine |
| 06/07/1988 | US4749046 Well drilling and completion apparatus |
| 06/07/1988 | US4749045 Well drilling and completion apparatus |
| 06/07/1988 | US4749039 Gun firing system using fluid filled pressure balance tubing |
| 06/07/1988 | US4749038 Method of designing a fracturing treatment for a well |
| 06/07/1988 | US4749035 Tubing packer |
| 06/07/1988 | US4749034 Fluid mixing apparatus for submersible pumps |
| 06/07/1988 | CA1237662A1 Setting tool with retractable torque fingers |
| 06/07/1988 | CA1237660A1 Marine production riser and method for installing same |
| 06/07/1988 | CA1237656A1 Increasing the flow of fluids through a permeable formation |
| 06/07/1988 | CA1237655A1 Well sand packing prevention method |
| 06/07/1988 | CA1237654A1 Hydraulic fracturing method |
| 06/02/1988 | WO1988003984A1 Method and apparatus for reduction of the pressure in a liquid mixture |
| 05/31/1988 | US4747642 Control of subsidence during underground gasification of coal |
| 05/31/1988 | US4747201 Boosterless perforating gun |
| 05/31/1988 | CA1237368A1 Method of producing heavy oils |
| 05/25/1988 | EP0177509A4 Process for clarifying bicarbonate bearing waters using measurement and control of carbon dioxide content. |
| 05/24/1988 | US4746423 In-well pump skimmer |
| 05/24/1988 | US4746245 Offshore drilling and/or production system |
| 05/24/1988 | US4745975 Water well completion apparatus and method of use |
| 05/24/1988 | US4745801 Groundwater sampling system |
| 05/24/1988 | CA1237071A1 Rotating fluid manifold |
| 05/24/1988 | CA1237070A1 Multiple zone oil recovery process employing countercurrent steam flood |
| 05/24/1988 | CA1237069A1 Multiple zone oil recovery process employing countercurrent steam flood |
| 05/18/1988 | EP0267638A1 Oil well safety valve adapted to artificial lifting |
| 05/17/1988 | US4744831 Hollow inorganic spheres and methods for making such spheres |
| 05/17/1988 | US4744730 Downhole jet pump with multiple nozzles axially aligned with venturi for producing fluid from boreholes |
| 05/17/1988 | US4744424 Shaped charge perforating apparatus |
| 05/17/1988 | US4744417 Method for effectively handling CO2 -hydrocarbon gas mixture in a miscible CO2 flood for oil recovery |
| 05/17/1988 | US4744416 Directional acoustic logger apparatus and method |
| 05/17/1988 | US4744245 Acoustic measurements in rock formations for determining fracture orientation |
| 05/17/1988 | CA1236753A1 Apparatus and method to prevent hydrate formation in a full wellstream pipeline |
| 05/16/1988 | EP0190286A4 Hollow microspheres made from dispersed particle compositions and methods and apparatus for producing them. |
| 05/11/1988 | EP0266792A2 Method and mortar composition for reconditioning a water well |
| 05/11/1988 | CN87103304A The oil drawer with self changing forque |
| 05/10/1988 | US4743761 Determining and comparing ratios of strontium isotopes in formation water and injected water; enhanced oil recovery |
| 05/10/1988 | US4743545 Immobilized cells and enzymes, biosynthesis |
| 05/10/1988 | US4743385 Oil recovery agent |
| 05/10/1988 | US4742873 Subterranean flood tracer process |
| 05/10/1988 | US4742872 Helically wrapped wire screen assembly and fitting therefor |
| 05/03/1988 | US4742496 Method of evaluating gravel packs |