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8939210 Drill collar severing tool  
A pipe severing tool is arranged to align a plurality of high explosive pellets along a unitizing central tube that is selectively separable from a tubular external housing. The pellets are loaded...
8881816 Shock load mitigation in a downhole perforation tool assembly  
A perforation tool assembly is provided. The perforation tool assembly comprises an energy train, a first perforation gun, and a second perforation gun. The energy train comprises a moderator to...
8851191 Selectively fired high pressure high temperature back-off tool  
A method for unseating a threaded connection of wellbore tubing within the wellbore. The method utilizes a back-off tool which consists of a tubular metal housing, a shaped charge and HNS...
8794326 Perforating gun with variable free gun volume  
A method of adjusting a pressure reduction to occur in a wellbore following firing of at least one perforating gun can include determining a desired free gun volume which corresponds to a desired...
8763723 Cartridge for breaking rock  
A cartridge for breaking rock which includes a tubular housing in which is formed a first compartment. The cartridge includes a first energetic composition inside the first compartment and a...
8757263 Downhole cyclic pressure pulse generator and method for increasing the permeability of pay reservoir  
This invention relates to the oil and gas industry and to exploration and production of water resources, in particularly, for stimulation of fluid flow to the well, e.g., for higher oil...
8714252 Shock load mitigation in a downhole perforation tool assembly  
A perforation tool assembly comprises an energy train, a first perforation gun, and a second perforation gun. The energy train comprises a moderator to reduce the speed of propagation of a...
8714251 Shock load mitigation in a downhole perforation tool assembly  
A perforation tool assembly comprises an energy train, a first perforation gun, and a second perforation gun. The energy train comprises a moderator to reduce the speed of propagation of a...
8684084 Method and apparatus for selective down hole fluid communication  
Methods and apparatus for perforating a formation in a wellbore without perforating a well bore casing. The methods and apparatus include an external casing perforating device configured so as not...
8575074 Insensitive explosive composition and method of fracturing rock using an extrudable form of the composition  
Insensitive explosive compositions were prepared by reacting di-isocyanate and/or poly-isocyanate monomers with an explosive diamine monomer. Prior to a final cure, the compositions are...
8567427 Blowout preventers using plates propelled by explosive charges  
Blowout preventer blocks, each having a channel and plate(s) to close it. The blocks are placed over a pipe through which oil or other fluid is escaping, so that the pipe is in their channels....
8561683 Wellbore tubular cutter  
An apparatus and a method for cutting a wellbore tubular may include an upper section and a lower section mating at a juncture plane defined by a plane transverse to the longitudinal axis of the...
8540027 Method and apparatus for selective down hole fluid communication  
Methods and apparatus for perforating a formation in a wellbore without perforating a well bore casing. The methods and apparatus include an external casing perforating device configured so as not...
8522863 Propellant fracturing system for wells  
A fracturing system for wells has a propellant charge having a known surface area for combustion, and a combustion rate as a function of pressure with lower combustion rates at lower pressures and...
8424606 Method and apparatus for perforating with reduced debris in wellbore  
A perforating system having a perforating gun with a tubular gun housing defining an inner volume and extending in an axial direction. A shaped charge is held in a loading tube. The loading tube...
8397813 Device for a test plug  
A plug (20) is described for carrying out tests of a well (30), a pipe or the like, comprising an explosive charge (55) with an activation mechanism (50, 51, 53) and which is detonated to remove...
8397818 Method and device for cleaning a cavity in a petroleum well  
A method and a device for removing sediment or other undesired material (28) from a cavity (24) in a petroleum well (2) in which a tool (30) is moved down into the petroleum well (2). The method...
8393392 Method and apparatus for perforating multiple wellbore intervals  
A bottom hole assembly for one trip perforating and treating a wellbore, the bottom hole assembly including: a tool body including an outer surface and an upper end; a fluid passage extending into...
8316872 Blowout preventer using a plate propelled by an explosive charge  
A blowout preventer with a block having a channel and one or more plates to close the channel. The block is placed over a pipe through which oil or other fluid is escaping, so that the pipe is in...
8281858 Shot perforator device and method for water well bore decommissioning  
Application of the method and device to a water well will permanently seal the well casing in order to prevent hydraulic cross-contamination with other water wells in the area. The method employs...
8272441 Wireless downhole tool positioning system  
A system for positioning a downhole tool along a pipe string, the system having a series of seating subs inserted along the length of the pipe string wherein each seating sub has a seating...
8210105 Method and device for detonating an explosive charge  
A method for detonation of a plug device in a fluid environment is described, which is in contact with a body, such as an ignition pellet, and it is characterized in that a number of pressure...
8127832 Well stimulation using reaction agents outside the casing  
Methods and apparatus for stimulating oil or gas wells using material cemented outside the casing. Reaction agents, usually comprising oxygen-rich material and a coil of high order explosive, are...
8113119 Surface safe explosive tool  
An explosive tool is disclosed. The explosive tool comprises a body structure, a charge, a detonator to ignite the charge via propagation of thermal energy, a pressure actuated safety to prevent...
8104536 Kerogen extraction from subterranean oil shale resources  
The present invention is directed to methods for extracting a kerogen-based product from subsurface (oil) shale formations, wherein such methods rely on fracturing and/or rubblizing portions of...
8047285 Method and apparatus to deliver energy in a well system  
The subject matter relates to an apparatus for insertion of a conduit into a well system bore to introduce a reactant fluid over a subterranean catalyst to initiate decomposition of the reactant...
8033333 Downhole perforation tool  
A propellant assembly for subsurface fracturing and method for using the same are provided. The assembly can include a first tubular member having an annulus formed therethrough; a second tubular...
8015921 Electronic blasting capsule  
An electronic blasting capsule which includes a housing which contains a propellant, a fuse, a sensor for detecting the position of the housing in a capsule delivery path, an energy arrangement...
7980310 Backoff sub and method for remotely backing off a target joint  
A backoff sub includes a housing and a backoff facilitator at least partially within the housing. The backoff sub is a part of the string that is stuck and is capable of adding energy to the...
7874362 Determination of downhole pressure while pumping  
Tubewaves are used to transmit an indication of the depth at which a condition is detected in a well. In particular, the depth is calculated based on the difference in arrival time at the surface...
7861785 Downhole perforation tool and method of subsurface fracturing  
A propellant assembly for subsurface fracturing and method for using the same are provided. The assembly can include a first tubular member having an annulus formed therethrough; a second tubular...
7854276 Methods, systems, and apparatus for production of hydrocarbons from a subterranean formation  
Methods, systems, and apparatus that are suitable for use in production of hydrocarbons from subterranean heavy oil deposits employ a subterranean cavity in communication with a borehole. The...
7819180 High-energy gas fracture apparatus for through-tubing operations  
Embodiments disclosed include a high-energy gas fracture apparatus for through-tubing operation. The apparatus includes a blast head, a fracturing body connected-with the blast head and an...
7810569 Method and apparatus for subterranean fracturing  
A subterranean formation stimulation system, comprising a gas generator, a high pressure seal, and a fluid injection system. The high pressure seal may be a packer and or plug having an outer...
7802619 Firing trigger apparatus and method for downhole tools  
Methods and devices are provided for controlling detonation of explosives in a well bore for perforation or a well bore casing, which avoid or reduce unintentional or undesirable detonations while...
7789164 Kerogen extraction from subterranean oil shale resources  
The present invention is directed to methods for extracting a kerogen-based product from subsurface (oil) shale formations, wherein such methods rely on fracturing and/or rubblizing portions of...
7762331 Process for assembling a loading tube  
A process is disclosed for assembling a loading tube for a perforating gun for use in a perforating system. At a first location, e.g., a shop, which is not the location at which perforating...
7753128 Method and system for well production  
Disclosed herein are methods for preparing a wellbore for production or injection. The methods may include the steps of positioning a completion longer than 300m comprising an inflow control...
7740069 Process for two-step fracturing of subsurface formations  
A process for in situ production of shale oil comprises fracturing the target zone 10 of an shale oil formation using a two step approach. First, an initial set of fractures 18 is developed in the...
7637318 Pressure communication assembly external to casing with connectivity to pressure source  
A pressure communication assembly external to casing with various forms of connectivity to a pressure source. A well system includes a casing string positioned in the well, with a bore extending...
7591318 Method for removing a sealing plug from a well  
A method for removing a sealing plug from a casing or a wellbore according to which a sealing plug is adapted to expand into engagement with the casing or the wellbore. A wireless signal is sent...
7533722 Surge chamber assembly and method for perforating in dynamic underbalanced conditions  
A surge chamber assembly (70) for use in a wellbore includes a housing (80) having one or more openings (112), a surge chamber (100) and a combustion chamber (98). The openings (112) provide fluid...
7500517 Kerogen extraction from subterranean oil shale resources  
The present invention is directed to methods for extracting a kerogen-based product from subsurface (oil) shale formations, wherein such methods rely on fracturing and/or rubblizing portions of...
7497260 Junk removal tool  
A junk removal tool (10) for use in a well bore. The tool includes a multi-faceted face (42) of tungsten carbide to break up large pieces of junk. The junk is then captured in the tool via large...
7451819 Openhole perforating  
An underbalanced perforating system is disclosed for use in openhole completions to maximize the wellbore and matrix cleanup efficiency, to connect natural fracture patterns, and/or to enable...
7357180 Inhibiting effects of sloughing in wellbores  
Certain embodiments provide a method for treating a subsurface formation. The method includes providing one or more explosives into portions of one or more wellbores selected for the explosion in...
7306038 Well cleaning method and apparatus using detonating cord having additional reliability and a longer shelf life  
The Invention is a Well Cleaning Method and Apparatus using detonating cord having Additional Reliability and a Longer Shelf Life. The method and apparatus employs one or more subassemblies, each...
7278482 Anchor and method of using same  
An anchoring tool to position an attached tool, such as a chemical cutter or other tools, in a predetermined position within the bore of a tubular. After the desired location for cutting the...
7228906 Propellant ignition assembly and process  
Method and apparatus for stimulating a subterranean formation that is penetrated by a well bore in fluid communication with the formation. At least one length of propellant is assembled with at...
7182103 Tubular patch expansion apparatus with inflatable bladder  
A tubular patch expansion apparatus includes an elongated tubular bladder adapted to expand radially outwardly to expand an overlying tubular patch. A bladder setting assembly is secured to a...
Matches 1 - 50 out of 295 1 2 3 4 5 6 >