| 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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| 05/19/1987 | US4665980 Method for improving well production by sonically driving granular medium installed in well |
| 05/19/1987 | CA1221907A1 Method for operating a production well in an oxygen driven in-situ combustion oil recovery process |
| 05/19/1987 | CA1221906A1 Carbon dioxide flooding with a premixed zone of carbon dioxide and crude oil components |
| 05/19/1987 | CA1221822A1 Fracturing fluid breaker system which is activated by fracture closure |
| 05/14/1987 | DE3627457A1 Process for the preparation of an aqueous, low-viscosity alkyltoluene- or alkylxylenesulphonate |
| 05/12/1987 | US4664819 Proppant charge and method |
| 05/12/1987 | US4664809 Groundwater pollution abatement |
| 05/12/1987 | US4664603 Petroleum recovery jet pump pumping system |
| 05/12/1987 | US4664602 Controller for plunger lift system for oil and gas wells |
| 05/12/1987 | US4664191 Minimizing formation damage during gravel pack operations |
| 05/12/1987 | US4664190 Process for recovering natural gas liquids |
| 05/12/1987 | US4664189 Method and device for carrying out measurements and operations in a well |
| 05/12/1987 | US4664188 Retrievable well packer |
| 05/12/1987 | US4664185 Freeze proof control center for submersible pumps |
| 05/12/1987 | US4664184 Balanced isolation tool enabling clean fluid in tubing perforated operations |
| 05/05/1987 | US4662831 Apparatus for fracturing earth formations while pumping formation fluids |
| 05/05/1987 | US4662785 Apparatus and method for connecting subsea production equipment to a floating facility |
| 05/05/1987 | US4662451 Method of fracturing subsurface formations |
| 05/05/1987 | US4662449 Method for controlling bottom water coning in a producing oil well |
| 05/05/1987 | US4662447 Gravel packing method and apparatus |
| 05/05/1987 | US4662446 Positionable in a well bore |
| 05/05/1987 | US4662443 Combination air-blown and oxygen-blown underground coal gasification process |
| 05/05/1987 | US4662441 Horizontal wells at corners of vertical well patterns for improving oil recovery efficiency |
| 05/05/1987 | US4662440 Methods for obtaining well-to-well flow communication |
| 05/05/1987 | US4662439 Method of underground conversion of coal |
| 05/05/1987 | US4662438 Method and apparatus for enhancing liquid hydrocarbon production from a single borehole in a slowly producing formation by non-uniform heating through optimized electrode arrays surrounding the borehole |
| 05/05/1987 | US4662437 Electrically stimulated well production system with flexible tubing conductor |
| 05/05/1987 | US4662391 Method and apparatus for splitting a liquid-vapor mixture |
| 05/05/1987 | CA1221305A1 Sweep improvement in enhanced oil recovery |
| 04/28/1987 | US4661127 To separate intermittent slugs of liquid from gas in pipeline |
| 04/28/1987 | US4661017 Method and apparatus for aligning underwater components |
| 04/28/1987 | US4661016 Subsea flowline connector |
| 04/28/1987 | US4660643 Cold fluid hydraulic fracturing process for mineral bearing formations |
| 04/28/1987 | US4660642 High strength, chemical resistant particulate solids and methods of forming and using the same |
| 04/28/1987 | US4660641 Sodium hydroxide and sodium carbonate |
| 04/28/1987 | US4660639 Removal of volatile contaminants from the vadose zone of contaminated ground |
| 04/28/1987 | US4660638 Downhole recorder for use in wells |
| 04/28/1987 | US4660637 For use in oil and gas wells |
| 04/28/1987 | US4660496 For processing crude oil and/or gas |
| 04/28/1987 | US4660415 Method for determining at least one magnitude characteristic of a geological formation |
| 04/28/1987 | CA1221085A1 Earth drilling apparatus and method |
| 04/28/1987 | CA1221054A1 Electro-osmotic production of hydrocarbons utilizing conduction heating of hydrocarbonaceous formations |
| 04/28/1987 | CA1221026A1 Method for recovering oil by in-situ combustion using oxygen |
| 04/28/1987 | CA1220931A1 Methods for acidizing subterranean formations and gelled acid compositions |
| 04/28/1987 | CA1220930A1 Methods for acidizing subterranean formations and gelled acid compositions |
| 04/23/1987 | WO1987002410A1 Multiple-stage coal seam fracing method |
| 04/23/1987 | DE3537472A1 Cover |
| 04/21/1987 | US4658903 Method for handling wellhead assembly |
| 04/21/1987 | US4658900 High energy firing head for well perforating guns |
| 04/21/1987 | US4658899 Clays, bauxite, dust fines, alumina |
| 04/21/1987 | US4658897 Downhole transducer systems |
| 04/21/1987 | US4658895 Gravel pack safety sub |
| 04/21/1987 | US4658893 Jet pump with reverse flow removal of injection nozzle |
| 04/15/1987 | CN85107754A Salt mining by drilling well at fixed point |
| 04/14/1987 | US4658208 Downhole steam quality measurement |
| 04/14/1987 | US4657944 CO2 -induced in-situ gelation of polymeric viscosifiers for permeability contrast correction |
| 04/14/1987 | US4657441 Penetration conductor pipe drive shoe |
| 04/14/1987 | US4657089 Method and apparatus for initiating subterranean well perforating gun firing from bottom to top |
| 04/14/1987 | US4657079 Screen |
| 04/14/1987 | US4657076 Chemical injection tube mounting structure for geothermal well |
| 04/14/1987 | US4656944 Select fire well perforator system and method of operation |
| 04/14/1987 | CA1220416A1 Multi-drain drilling and petroleum production start- up device |
| 04/14/1987 | CA1220415A1 High sweep efficiency steam drive oil recovery method |
| 04/14/1987 | CA1220414A1 Method for the recovery of viscous oil utilizing mixtures of steam and oxygen |
| 04/14/1987 | CA1220413A1 Method for initiating an oxygen driven in-situ combustion process |
| 04/14/1987 | CA1220412A1 Method and apparatus for increasing the concentration of proppant in well stimulation techniques |
| 04/09/1987 | WO1987002117A1 Device for supplying a pump with a diphase fluid and plant for producing hydrocarbons comprising such a device |
| 04/08/1987 | EP0217557A2 Well perforating system |
| 04/08/1987 | EP0216805A1 Method and means for obtaining data representing a parameter of fluid flowing through a down hole side of an oil or gas well bore |
| 04/07/1987 | US4655936 Microbiological control in uranium processing |
| 04/07/1987 | US4655922 Wire locking structure for a filter device |
| 04/07/1987 | US4655298 Annulus pressure firer mechanism with releasable fluid conduit force transmission means |
| 04/07/1987 | US4655290 Latching production seal assembly |
| 04/07/1987 | US4655283 Apparatus for perforating and producing a well |
| 04/07/1987 | US4655138 Shaped charge carrier assembly |
| 04/07/1987 | CA1220133A1 Safety device for submerged wellhead |
| 04/07/1987 | CA1220131A1 Direct contact low emission steam generating system utilizing a compact, multi-fuel burner |
| 04/01/1987 | EP0216661A1 Process for preventing the flow of water in oil and/or gas wells |
| 04/01/1987 | EP0216417A2 Packer and service tool assembly |
| 04/01/1987 | EP0216406A1 Fluid driven pumping apparatus |
| 04/01/1987 | CN85101452A Microbiocidal anionic sequestrants with polyvalent metal cations for permeability correction process |
| 03/31/1987 | US4654266 Durable, high-strength proppant and method for forming same |
| 03/31/1987 | US4653989 Oil well pumping mechanism |
| 03/31/1987 | US4653960 Submersible offshore drilling production and storage platform with anti-catenary stationing |
| 03/31/1987 | US4653587 Method and apparatus for the sonic cementing of wells in porous formations |
| 03/31/1987 | US4653586 Method and apparatus for controlling sand accumulation in a producing wellbore |
| 03/31/1987 | US4653583 Optimum production rate for horizontal wells |
| 03/26/1987 | WO1987001759A1 Slug-catcher that can be pigged |
| 03/25/1987 | CN86102979A 链条抽油机 Pumping chain |
| 03/24/1987 | US4652054 Solution mining of trona or nahcolite ore with electrodialytically-produced aqueous sodium hydroxide |
| 03/24/1987 | US4651836 Process for recovering methane gas from subterranean coalseams |
| 03/24/1987 | US4651826 Oil recovery method |
| 03/24/1987 | US4651825 Enhanced well production |
| 03/24/1987 | US4651824 Controlled placement of underground fluids |
| 03/24/1987 | CA1219525A1 Process for recovering gases from landfills |
| 03/18/1987 | CN86103769A In-situ steam drive oil recovery process |
| 03/17/1987 | US4650596 Pour point depressants for paraffin solutions |
| 03/17/1987 | US4650011 Method and apparatus for drilling a hole in an ice formations and pumping water out from such hole |
| 03/17/1987 | US4650010 Borehole devices actuated by fluid pressure |
| 03/17/1987 | US4650009 Apparatus and method for use in subsurface oil and gas well perforating device |