| 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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| 01/17/1978 | US4068720 Method for acidizing subterranean formations |
| 01/17/1978 | US4068719 Acrylamide polymer, reducing agents, metal compound, gelation |
| 01/17/1978 | US4068718 Hydraulic fracturing method using sintered bauxite propping agent |
| 01/17/1978 | US4068717 Producing heavy oil from tar sands |
| 01/17/1978 | US4068716 Oil recovery process utilizing aromatic solvent and steam |
| 01/17/1978 | US4068715 Method for recovering viscous petroleum |
| 01/17/1978 | US4068713 Plastic well screen |
| 01/10/1978 | US4067617 Subterranean drilling and slurry mining |
| 01/10/1978 | US4067616 Recovering bitumen with fluorochlorocarbon solvent |
| 01/10/1978 | US4067391 In-situ extraction of asphaltic sands by counter-current hydrocarbon vapors |
| 01/10/1978 | US4067390 Apparatus and method for the recovery of fuel products from subterranean deposits of carbonaceous matter using a plasma arc |
| 01/10/1978 | US4067385 Apparatus and method for connecting a tubing string to downhole well equipment |
| 01/10/1978 | US4067350 Gas lift valve |
| 01/03/1978 | US4066297 Introducing alkaline leach solution undersaturated in carbonates into mining formation |
| 01/03/1978 | US4066282 Positive tubing release coupling |
| 01/03/1978 | US4066137 Flame jet tool for drilling cross-holes |
| 01/03/1978 | US4066128 Well flow control apparatus and method |
| 01/03/1978 | US4066127 Processes for producing bitumen from tar sands and methods for forming a gravel pack in tar sands |
| 01/03/1978 | US4066123 Hydraulic pumping unit with a variable speed triplex pump |
| 01/03/1978 | US4065935 Articulated joints for deep water installations |
| 12/27/1977 | US4065183 Recovery system for oil shale deposits |
| 12/27/1977 | US4064942 Aquifer-plugging steam soak for layered reservoir |
| 12/27/1977 | US4064941 Apparatus and method for mixing separated fluids downhole |
| 12/27/1977 | US4064938 Well screen with erosion protection walls |
| 12/27/1977 | US4064935 Oil well stimulation apparatus |
| 12/20/1977 | US4063780 Method of recovering liquid and gaseous products of oil shale |
| 12/20/1977 | US4063594 Pressure-balanced well service valve |
| 12/20/1977 | US4063509 Device for stimulation of geothermal wells |
| 12/20/1977 | US4063416 Steam generator |
| 12/13/1977 | US4062571 Rapidly connectable and disconnectable pipe union |
| 12/13/1977 | US4062405 Method of treating oil-bearing formations using molten sulfur insulating packer fluid |
| 12/13/1977 | US4062404 Method for in situ combustion |
| 12/06/1977 | US4061580 Alkoxylated amine phosphate |
| 12/06/1977 | US4061190 In-situ laser retorting of oil shale |
| 12/06/1977 | US4060988 Process for heating a fluid in a geothermal formation |
| 11/29/1977 | US4060131 Mechanically set liner hanger and running tool |
| 11/29/1977 | US4060130 Cleanout procedure for well with low bottom hole pressure |
| 11/29/1977 | US4060129 Method of improving a steam drive |
| 11/22/1977 | US4059308 Pressure swing recovery system for oil shale deposits |
| 11/22/1977 | US4059288 Pressure balanced safety pipeline connector |
| 11/22/1977 | US4059166 Subterranean drilling and slurry mining |
| 11/22/1977 | US4059156 Geothermal brine production |
| 11/22/1977 | US4059154 Micellar dispersions with tolerance for extreme water hardness for use in petroleum recovery |
| 11/22/1977 | US4059152 Thermal recovery method |
| 11/22/1977 | US4059151 Methods of fluidized production of coal in situ |
| 11/22/1977 | US4059150 Anchoring assembly |
| 11/22/1977 | US4059021 Apparatus for converting oscillatory motion to reciprocating motion |
| 11/15/1977 | US4058166 Well setting tool |
| 11/15/1977 | US4058163 Selectively actuated vibrating apparatus connected with well bore member |
| 11/15/1977 | US4058137 Riser pipe for pivotally attached structure used to extract petroleum from beneath a body of water |
| 11/08/1977 | US4057780 Method for describing fractures in subterranean earth formations |
| 11/08/1977 | US4057293 Process for in situ conversion of coal or the like into oil and gas |
| 11/08/1977 | US4057268 Disconnectable pipe union and device for manoeuvring same |
| 11/08/1977 | US4057107 Method of initiating underground in-situ combustion |
| 11/01/1977 | US4056335 Subsurface pumping installation for handling viscous or sand-laden fluids |
| 10/25/1977 | US4055399 Tracers in predetermined concentration ratios |
| 10/25/1977 | US4055122 Method of placing blasting charges in wet boreholes |
| 10/18/1977 | US4054320 Method for the removal of radioactive waste during in-situ leaching of uranium |
| 10/11/1977 | US4053015 Ignition process for downhole gas generator |
| 10/04/1977 | US4052703 Intelligent multiplex system for subsurface wells |
| 10/04/1977 | US4052176 Production of purified synthesis gas H2 -rich gas, and by-product CO2 -rich gas |
| 10/04/1977 | US4051907 Selective firing system |
| 10/04/1977 | US4051901 Process for water treatment in mobility controlled caustic flooding process |
| 10/04/1977 | US4051900 Propping material for hydraulic fracturing |
| 10/04/1977 | US4051896 Well bore liner hanger |
| 10/04/1977 | US4051894 Single string hanger system |
| 10/04/1977 | US4051889 Heating frasch sulphur mine water using waste heat |
| 10/04/1977 | US4051686 Platforms resting upon the bed of a body of water |
| 09/27/1977 | US4050854 Fluid lifting apparatus |
| 09/27/1977 | US4050529 Apparatus for treating rock surrounding a wellbore |
| 09/27/1977 | US4050516 Method of injecting fluids into underground formations |
| 09/27/1977 | US4050515 Insitu hydrogenation of hydrocarbons in underground formations |
| 09/27/1977 | US4050513 Method of treating a high temperature formation to permit the use therein of temperature sensitive hydrophilic, viscosity increasing polymers |
| 09/20/1977 | US4049056 Oil and gas well stimulation |
| 09/20/1977 | US4049055 Gravel pack method, retrievable well packer and gravel pack apparatus |
| 09/20/1977 | US4049053 Recovery of hydrocarbons from partially exhausted oil wells by mechanical wave heating |
| 09/13/1977 | US4048078 Oil recovery process utilizing air and superheated steam |
| 09/13/1977 | US4047760 In situ recovery of shale oil |
| 09/13/1977 | US4047695 Adjustable choke |
| 09/13/1977 | US4047569 Method of successively opening-out and treating productive formations |
| 09/13/1977 | US4047565 Well tool |
| 09/13/1977 | US4047390 Sea tent |
| 09/06/1977 | US4046405 Run-in and tie back apparatus |
| 09/06/1977 | US4046198 Method and apparatus for gravel packing wells |
| 09/06/1977 | US4046197 Well completion and workover method |
| 09/06/1977 | US4046195 Injection of steam and oxygen-containing gas |
| 09/06/1977 | US4046194 Electrolinking method for improving permeability of hydrocarbon formation |
| 08/30/1977 | US4045085 Fracturing of pillars for enhancing recovery of oil from in situ oil shale retort |
| 08/30/1977 | US4045084 In-situ mining of copper and nickel |
| 08/30/1977 | US4044833 Propping agents for wells |
| 08/30/1977 | US4044832 Concentric gravel pack with crossover tool and method of gravel packing |
| 08/30/1977 | US4044831 Secondary recovery process utilizing water saturated with gas |
| 08/30/1977 | US4044830 Multiple-completion geothermal energy production systems |
| 08/30/1977 | US4044828 Process for direct measurement of the orientation of hydraulic fractures |
| 08/30/1977 | US4044827 Apparatus for treating wells |
| 08/23/1977 | US4043922 Secondary oil recovery process using oxyalkylated additives |
| 08/23/1977 | US4043921 Secondary oil recovery |
| 08/23/1977 | US4043599 Acid preinjection to decrease instantaneous acid consumption in in-situ mining |
| 08/23/1977 | US4043598 Multiple zone preparation of oil shale retort |
| 08/23/1977 | US4043597 Multiple level preparation of oil shale retort |