| 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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| 05/02/1990 | CN2056695U Mechanical directin changing steel cable oil pumping machine |
| 05/02/1990 | CN2056694U Pumping oil distribution device |
| 05/02/1990 | CN1041738A Process for preparing sulfur solvent compositions |
| 05/01/1990 | US4921821 Lightweight oil and gas well proppants and methods for making and using same |
| 05/01/1990 | US4921820 Lightweight proppant for oil and gas wells and methods for making and using same |
| 05/01/1990 | US4921576 Method for improving sweep efficiency in CO2 oil recovery |
| 05/01/1990 | US4921048 Well production optimizing system |
| 05/01/1990 | US4921047 Composition and method for sealing permeable subterranean formations |
| 05/01/1990 | CA1268415A1 Enhanced crude oil recovery |
| 05/01/1990 | CA1268412A1 Method for the production of a fluid residing in a multiple fluid geological formation |
| 05/01/1990 | CA1268325A1 Fracturing process for low permeability reservoirs employing a compatible hydrocarbon-liquid carbon dioxide mixture |
| 04/28/1990 | CA2001685A1 Process for pumping a multi-phase gas-liquid mixture by means of the use of a pump |
| 04/25/1990 | EP0365390A1 Process for the production of polysaccharides by fermentation of a carbon source using microorganisms |
| 04/25/1990 | EP0364703A2 Process for preparing sulfur solvent compositions |
| 04/25/1990 | CN2056445U Heating extractor for petroleum |
| 04/25/1990 | CN2056444U Extension spring valve for pit |
| 04/25/1990 | CN1041636A Protective device for oil pumping machine |
| 04/24/1990 | US4919989 Article for sealing well castings in the earth |
| 04/24/1990 | US4919209 Method for treating subterranean formations |
| 04/24/1990 | US4919207 Method for drawing up special crude oil |
| 04/24/1990 | US4919206 Method for preventing bitumen backflow in injection wells when steam injection is interrupted |
| 04/24/1990 | US4919050 Well perforating device |
| 04/24/1990 | CA1268218A1 Oil recovery system and method of using microwave energy |
| 04/19/1990 | WO1990004084A1 Arrangement for protecting components in subsea systems |
| 04/18/1990 | EP0364362A1 Method and device for logging non-eruptive wells |
| 04/18/1990 | EP0363508A1 A method of controlling the flow of landfill gas from sanitary landfills and apparatus for performing the method |
| 04/18/1990 | CN2056190U Sealed casing oil-well pump |
| 04/17/1990 | US4917189 Method and apparatus for perforating a well |
| 04/17/1990 | US4917188 Method for setting well casing using a resin coated particulate |
| 04/17/1990 | US4917187 Method and apparatus for hydraulically firing a perforating gun below a set packer |
| 04/17/1990 | US4917183 Gravel pack screen having retention mesh support and fluid permeable particulate solids |
| 04/17/1990 | US4916946 Method of flowing a high viscosity substance through a conduit at a low apparent viscosity |
| 04/17/1990 | CA1267967A1 Hydraulic fracture analysis method |
| 04/17/1990 | CA1267835A1 Oil well downhole liquid injection assembly |
| 04/14/1990 | CA2000518A1 Arrangement for protecting components |
| 04/11/1990 | CN2055862U Cased well high energy press-cracking pellet |
| 04/11/1990 | CN2055861U Injection style high ball shaped compensator |
| 04/11/1990 | CN2055860U Hydraulic system of energy-saving hydraulic oil extractor |
| 04/11/1990 | CN1007542B Adjustable out-of-phase crank balanced oil extractor and related method |
| 04/10/1990 | US4916617 Controller for well installations |
| 04/10/1990 | US4916312 Device for placing a radioactive source in a formation through which a borehole passes |
| 04/10/1990 | US4915505 Blender apparatus |
| 04/10/1990 | US4915452 Hydraulic borehole mining system and method |
| 04/10/1990 | US4915416 Underwater oil production |
| 04/10/1990 | US4915176 Injecting an antiagglomerant to form a dispersion; petroleum oil and gas from ocean wells |
| 04/10/1990 | US4915173 Method for staged placement of gravel packs |
| 04/10/1990 | US4915172 Method for completing a non-vertical portion of a subterranean well bore |
| 04/10/1990 | US4915171 Above packer perforate test and sample tool and method of use |
| 04/10/1990 | US4915170 Enhanced oil recovery method using crosslinked polymeric gels for profile control |
| 04/10/1990 | US4915169 Method for controlling the pH of steam fluids using heterocyclic, multifunctional, nitrogen-containing compounds |
| 04/10/1990 | US4915029 Shaped charge carrier assembly method |
| 04/05/1990 | WO1990003494A1 Method and installation for mining |
| 04/05/1990 | WO1990003492A1 Subsea flowline connection |
| 04/05/1990 | WO1990003491A1 Submerged umbilical connection arrangement |
| 04/04/1990 | EP0361553A2 Gravel packing tool |
| 04/04/1990 | CN2055536U Hot extracting off-line drip |
| 04/04/1990 | CN2055535U Hydraulic long stroke energy-saving beam-pumping unit |
| 04/03/1990 | US4914514 Method and apparatus for gauging well screens |
| 04/03/1990 | US4913630 Method and apparatus for high-efficiency gas separation upstream of a submersible pump |
| 04/03/1990 | US4913239 Submersible well pump and well completion system |
| 04/03/1990 | US4913238 Floating/tensioned production system with caisson |
| 04/03/1990 | US4913237 Remedial treatment for coal degas wells |
| 04/03/1990 | US4913236 Corrosion resistance by forming alkaline component in vapor phase |
| 04/03/1990 | US4913235 Enhanced oil recovery using CO2 flooding |
| 04/03/1990 | US4912971 System for recovery of petroleum from petroleum impregnated media |
| 04/03/1990 | US4912941 Drilling fracturing, forcing heat-conducting substance into passages, joining supply and return lines |
| 04/03/1990 | CA1267361A1 Stimulation of earth formations surrounding a deviated wellbore by sequential hydraulic fracturing |
| 04/03/1990 | CA1267360A1 Gas lift optimization |
| 03/28/1990 | EP0360364A2 Riser tensioner |
| 03/28/1990 | EP0360319A1 Method for placing a body of shape memory material within a cavity |
| 03/28/1990 | EP0181915B1 Surfactant compositions for steamfloods |
| 03/28/1990 | CN2055180U Tubular oil drainer |
| 03/28/1990 | CN2055179U Integral bulk assembly oil-pump base |
| 03/28/1990 | CN1040859A Method for placing body of shape memory metal within tubing |
| 03/27/1990 | US4911251 Method and apparatus for actuating a tubing conveyed perforating gun |
| 03/27/1990 | US4911241 Constant viscosity foam |
| 03/27/1990 | US4911240 Self treating paraffin removing apparatus and method |
| 03/27/1990 | US4911237 Running tool for liner hanger |
| 03/27/1990 | CA1267178A1 Manipulative device |
| 03/27/1990 | CA1267079A1 Method for removal of flow restricting matter from hydrocarbon producing wells |
| 03/27/1990 | CA1267075A1 Encapsulated water absorbent polymers as lost circulation additives for aqueous drilling fluids |
| 03/22/1990 | DE3920098A1 Filtration of underground water - involves filter pipe made from stack of rings of rhomboid cross=section |
| 03/21/1990 | CN2054826U Small-diameter air anchor |
| 03/21/1990 | CN2054825U Double layer self-adjusting water distributor |
| 03/21/1990 | CN1040652A Inhibition of reservoir scale |
| 03/21/1990 | CN1040651A Miscible gas enhanced oil recovery method using ethoxylated alkyphenol sulfonate-sulfate |
| 03/21/1990 | CN1040650A Test technology for thermally cyclic parallel-pipe oil extraction |
| 03/21/1990 | CN1007280B Method for oil tri-production with escaping oil gas at deep hole |
| 03/14/1990 | CN2054483U Sucker machine with balance cylinder and light-rod coaxial |
| 03/14/1990 | CN2054482U Double-level three-purpose deep-well christmas pump |
| 03/14/1990 | CN1040411A Hydraulic fracture mining process of multilayer rock salt |
| 03/13/1990 | US4907656 Method for preventing steam channelling into a non-aquifer bottom water zone |
| 03/13/1990 | CA1266558A1 Peroxygen breaker systems for well completion fluids |
| 03/08/1990 | EP0348463A4 Gravel pack for petroleum or water wells. |
| 03/07/1990 | EP0357317A1 Electric motor |
| 03/07/1990 | EP0357180A1 Subsea guidebase |
| 03/07/1990 | CN2054073U Out-of-phase offset type crank pin device |
| 03/06/1990 | US4906137 Apparatus for transferring fluid between subsea floor and the surface |
| 03/06/1990 | US4906136 Method for connecting a conduit to a subsea structure, and a device for use in connecting a conduit end to a subsea structure |
| 03/06/1990 | US4906135 Method and apparatus for salt dome storage of hazardous waste |