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5603379 Bi-directional explosive transfer apparatus and method  
A bi-directional explosive transfer apparatus for use in connecting and orienting perforating guns in a well. The apparatus includes a connector having first and second housing portions which are...
5598891 Apparatus and method for perforating and fracturing  
An apparatus and method for perforating and fracturing subterranean formations to enhance fluid production. At least one unlined punch charge is loaded into at least one punch charge carrier, and...
5598894 Select fire multiple drill string tester  
A system is provided for selectively perforating multiple zones in a well either simultaneously, or in series, having isolation barriers, or packers, located between the perforating multiple...
5571986 Method and apparatus for activating an electric wireline firing system  
A method and apparatus of activating electric wireline firing systems in which a firing pin is restrained against movement toward a detonator until application of sufficient voltage to the...
5551344 Method and apparatus for overbalanced perforating and fracturing in a borehole  
An overbalance technique propagates a fracture in a formation to stimulate hydrocarbon production from a wellbore. A liquid column in the wellbore is driven into the formation by a gas generator...
5540293 Firing Head  
An explosive or combustion actuated subsurface well tool includes a firing head for initiating operation of the tool in response to a projectile, such as a ball or go-devil, being pumped down a...
5509480 Chemical cutter and method for high temperature tubular goods  
Chemical cutting processes and tools for use in a well bore useful in the cutting of high strength and corrosion-resistant downhole tubular goods. The cutting tool has an elongated tool body...
5509482 Perforation trigger bypass assembly and method  
A perforation trigger bypass conduit assembly (10) for a well perforation gun (17) positioned in a well casing (12) at a down-hole location below a tubular completion assembly (16). A pressure...
5509481 Method of perforating including an automatic release apparatus suspending by wireline or coiled tubing in a wellbore for perforating a long length interval of the wellbore in a single run using a gun string longer than a wellhead lubricator  
A new perforating method and release apparatus enables a wellbore operator to perforate long length intervals of a wellbore during a single perforating run into the wellbore, the interval of the...
5505261 Firing head connected between a coiled tubing and a perforating gun adapted to move freely within a tubing string and actuated by fluid pressure in the coiled tubing  
A firing head adapted to connected between a coiled tubing and a perforating gun, is sized and shaped to enable it to move freely within a tubing string in the wellbore, may be actuated by fluid...
5490563 Perforating gun actuator  
An actuating tool which is conveyed into a tubing string to attach to portions of an emplaced perforating gun. The tool includes an actuator with an electronic delay timer and an explosive device....
5484021 Method and apparatus for forming a window in a subsurface well conduit  
A method and apparatus for forming a window in well casing. First, using coiled tubing, a two stage whipstock is set in the well casing through the production tubing. Next, a jointed milling...
5484018 Method for accessing bypassed production zones  
A method for establishing production of oil or gas from a secondary production zone which is above a primary production zone in a well in which a settable material is placed in the annulus between...
5482116 Wellbore guided hydraulic fracturing  
Method of hydraulic fracturing of a subterranean formation comprising drilling a deviated wellbore in a direction parallel to a desired fracture direction, and supplying fracturing fluid through...
5472050 Use of sequential fracturing and controlled release of pressure to enhance production of oil from low permeability formations  
Hydrocarbon production from a low permeability formation is increased by fracturing a production interval in the formation and restricting the release of pressure from the fracture to lengthen the...
5467824 Apparatus for and a method of severing multiple casing strings using explosives  
A method of and apparatus for severing multiple concentric casing strings in an abandoned oil or gas well allowing the upper portion of the casing strings to be removed comprising positioning a...
5467823 Methods and apparatus for long term monitoring of reservoirs  
A method and apparatus of monitoring subsurface formations containing at least one fluid reservoir and traversed by at least one well, by means of at least one sensor responsive to a parameter...
5462117 Tubing conveyed perforating system with fluid loss control  
A reliable tubing conveyed perforating operation may be coupled with methods and equipment for substantially minimizing the loss of completion fluids, thereby allowing recovery of the expensive...
5449039 Apparatus and method for horizontal well fracture stimulation  
An apparatus and method for perforating in deviated and horizontal wells. A firing pin and charge housing is integrally secured to a generally tubular body. The firing pin and charge housing has a...
5443119 Method for controlling sand production from a hydrocarbon producing reservoir  
In a hydrocarbon-producing well penetrating an unconsolidated hydrocarbon reservoir, the azimuthal direction of the maximum in-situ horizontal compressive stress within the reservoir having...
5443123 Method of particulate consolidation  
A method of consolidating an incompetent particulate in a subterranean formation penetrated by a wellbore accomplished by introducing fluids to be injected into a wellbore into coiled tubing while...
5435394 Anchor system for pipe cutting apparatus  
An apparatus for cutting pipe disposed in a string down a borehole of an oil or gas well, including an elongated body for lowering into the bore of the string and defining an annulus between the...
5429192 Method and apparatus for anchoring a perforating gun to a casing in a wellbore including a primary and a secondary anchor release mechanism  
A wellbore tool includes an anchor connected to a perforating gun, the anchor including an anchor slip disposed between upper and lower slip housings for expanding to grip a casing in the...
5429191 High-pressure well fracturing method using expansible fluid  
Fractures are initiated or extended within an earth formation from a well which includes a tubing string extending to a wellbore space adjacent the fracture zone from a conventional wellhead....
5423382 Apparatus for releasing perforating gun equipment from a well casing  
Apparatus engageable with a well casing for suspending a perforating gun in the casing. The apparatus includes toothed slips forced into engagement with the well casing. A spring maintains an...
5421418 Apparatus and method for mixing polyacrylamide with brine in an annulus of a wellbore to prevent a cement-like mixture from fouling wellbore tools  
Prior to pumping completion brine fluid into a wellbore, an additive comprising two percent (2%) of a 0.25% solution of polyacrylamide is blended into the completion brine fluid thereby producing...
5400857 Oilfield tubular shear ram and method for blowout prevention  
A ram assembly for positioning within a through bore of a blowout preventer body includes first and second opposing ram pistons each powering a respective knife blade. Each knife blade may have a...
5400856 Overpressured fracturing of deviated wells  
Methods are provided for overpressured perforating and fracturing of a subsurface formation in a substantially deviated well. A perforating gun is run into the well and is pushed through the...
5398760 Methods of perforating a well using coiled tubing  
Methods of perforating a well using coiled tubing conveyed perforating guns are disclosed. A perforating tool string includes a coiled tubing string, a perforating gun, a releasable gun hanger,...
5392857 Apparatus and method for determining an optimum phase angle for phased charges in a perforating gun to maximize distances between perforations in a formation  
A novel method utilizing a new mathematical formulation for determining an optimum phase angle for phasing shaped charges in a perforating gun allows a novel perforating apparatus to be designed...
5390742 Internally sealable perforable nipple for downhole well applications  
A longitudinally spaced series of tubular nipple structures are installed in a well flow conductor operatively extended through a subterranean well bore. Each nipple structure has a thinned-wall,...
5373899 Compatible fluid gravel packing method  
The invention controls a well during completion by first running a sealable well completion tool and string downhole from the surface and isolating a productive interval near an oil or gas...
5370186 Apparatus and method of perforating wellbores  
An anchoring system for a perforating gun is disclosed which supports the gun from above. The anchor can be run in with conventional tools and is settable in the wellbore by pressurizing the...
5366013 Shock absorber for use in a wellbore including a frangible breakup element preventing shock absorption before shattering allowing shock absorption after shattering  
A shock absorber, adapted to be disposed above a perforating gun in a tool string and adapted to be disposed in a wellbore, includes a crushable element disposed between an inner and outer...
5366014 Method and apparatus for perforating a well using a modular perforating gun system  
A modular perforating gun system for use in perforating a well. The system comprises a lower perforating gun module or section which may be supported in a variety of ways adjacent to a well...
5361843 Dedicated perforatable nipple with integral isolation sleeve  
A production nipple is suspended within an uncased bore hole in a slimhole/monobore completion. A deposit of cement is conveyed through the nipple and is spotted in the annulus across the face of...
5355957 Combined pressure testing and selective fired perforating systems  
A system is provided for performing multiple operations on a well in response to multiple fluid pressure increases. The system includes first and second pressure actuated firing heads and a source...
5353875 Methods of perforating and testing wells using coiled tubing  
Methods of draw-down and build-up testing on existing production wells are disclosed. The testing may be accomplished without removing the production tubing string from the well. The production of...
5346014 Heat activated ballistic blocker  
A method and an apparatus for use in a wellbore are provided to prevent an igniter from igniting a pyrotechnic device within a downhole well tool until after the downhole well tool is positioned...
5320174 Downhole chemical cutting tool and process  
Chemical cutting processes and tool for use in a well bore useful in the cutting of high strength and corrosion-resistant downhole tubular goods. The cutting tool has an elongated tool body...
5318123 Method for optimizing hydraulic fracturing through control of perforation orientation  
An improved method for fracturing oil wells is disclosed and claimed herein. In particular, the present invention involves the determination of the direction of fracture propagation, i.e.,...
5318126 Explosively opened production valve including a frangible breakup element operated by tubing pressure or rathole pressure or both  
A production valve includes an outer housing having a production port, a piston disposed within the outer housing and adapted to move from one position to another position, a frangible breakup...
5314020 Technique for maximizing effectiveness of fracturing in massive intervals  
A process where massive hydraulic fracturing (MHF) is used in combination with a novel horizontal and vertical well drilling scheme. The novel well drilling scheme provides the cost benefits of...
5301755 Air chamber actuator for a perforating gun  
A firing head actuator for a perforating gun includes an atmospheric pressure chamber which is run into the well on a slick line. The atmospheric pressure chamber can then be communicated with a...
5297629 Drill stem testing with tubing conveyed perforation  
A well test string includes an annulus pressure responsive tester valve and a tubing conveyed perforating gun including a tubing pressure actuated time delay firing mechanism. A compression set...
5295539 Two well hydrocarbon producing method using multiple fractures  
This specification discloses a method of hydraulic fracturing a subterranean formation wherein two horizontally spaced-apart wells are provided and completed to communicate with the formation....
5295544 Decentralized casing hole puncher  
An explosive charge carrier is provided which is lowered into a well pipe casing. The carrier includes wear plates that slide along the inner diameter of the pipe and which are biased against the...
5293940 Automatic tubing release  
An automatic tubing release mechanism is adapted to be disposed in a wellbore between a tubing, on one end, and a perforating gun, on the other end. The release mechanism includes a frangible...
5287924 Tubing conveyed selective fired perforating systems  
A system is provided for selectively perforating multiple zones in a well on a single trip into the well. The system includes a tubing string which carries at least a first and a second...
5287928 Apparatus and method for repairing a gravel-packed well completion  
An apparatus for repairing a well completion having a gravel-packed annulus formed by a liner and a well casing, the annulus having at least one region within the gravel pack which is devoid of...