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5279366 Method for wireline operation depth control in cased wells  
Wireline operation depth control in cased wells can be substantially improved by attaching a combined magnetic and radioactive marker to the casing in the vicinity of the zone of interest. A cased...
5273115 Method for refracturing zones in hydrocarbon-producing wells  
A method is provided for refracturing a well which has previously been hydraulically fractured in a lower zone or in the same zone. A sealing material is injected and allowed to solidify, the well...
5271465 Over-pressured well fracturing method  
Hydraulic fractures are initiated or extended into fluid-producing earth formations from a cased well by filling a space within the casing adjacent the formation zone of interest with liquid which...
5265675 Well conduit cutting and milling apparatus and method  
A well conduit cutting and milling apparatus conveyable into and out of a well on coilable tubing using a tubing injection unit. The apparatus includes tubing or casing cutting arms which are...
RE34451 Perforating gun with auger  
The invention features a perforating gun, with an external auger, which can be mounted to a tubing string. The auger facilitates removal of the gun after the sand is placed in the perforations....
5259466 Method and apparatus for orienting a perforating string  
An improved method and apparatus are provided for orienting a particular well completion in accordance with azimuths determined with respect to magnetic north. The invention permits the...
5259454 Process for controlling oil well fires  
Conventional bombs or commercially available explosives are selectively placed about well pipes and exploded to cause closure of the well pipe and thus resulting in substantial reduction in the...
5224545 Eccentrically actuated perforating guns  
A perforating gun is supported from the lower end of a side pocket mandrel. The perforating gun includes a mechanical detonator which is received within the side pocket receptacle bore. The...
5215149 Single horizontal well conduction assisted steam drive process for removing viscous hydrocarbonaceous fluids  
A conduction assisted steam flooding process is described where heavy oil is recovered from reservoirs with limited native injectivity and a high water saturated bottom zone. A horizontal well is...
5211234 Horizontal well completion methods  
Methods of completing a well bore having a conduit disposed therein where portions of the well bore and conduit are positioned substantially horizontally in a subterranean producing formation are...
5211714 Wireline supported perforating gun enabling oriented perforations  
A perforating gun assembly is set forth. It incorporates a swivel connected with a cable head assembly and a navigation system for determining the instantaneous angle of the tool with respect to a...
5199493 Methods and apparatus for shutting a conduit  
A conduit is shut off by a shut-off valve mechanism which is attached to an external periphery of an exposed region of the conduit. That region is exposed by excavation from the ground surface. A...
5191933 Wellbore apparatus including a rathole pressure balanced-differential pressure firing system  
A well apparatus adapted to be disposed in a wellbore includes a perforating apparatus and a packer adapted to set and isolate an annulus above the packer from a rathole annulus below the packer,...
5191936 Method and apparatus for controlling a well tool suspended by a cable in a wellbore by selective axial movements of the cable  
In the representative embodiment of the method and apparatus of the invention which are disclosed herein, a well tool arranged for suspension in a well bore from a cable includes a mandrel that is...
5188177 Magnetic-pulse sealing of oil-well-head pipe  
A well-head pipe of a leaking oil well is sealed by radial application of a high-energy magnetic pulse to the well-head pipe to thereby plastically deform the metal of the pipe casing and form the...
5178218 Method of sand consolidation with resin  
Methods are provided for chemically consolidating subterranean formations around wells using resins. Resins are forced into the formations by high pressures instantaneously applied when...
5170844 Pressure responsive below-packer valve apparatus  
A pressure responsive below packer valve apparatus which allows operation of a below packer valve through application of pressure to the wellbore annulus above the packer. The valve apparatus...
5167282 Apparatus and method for detonating well perforators  
A pressure-actuated head for detonating a gun for perforating a well bore is suspended on a tubing string for lowering down the well. The head includes a detonator pin biased towards a detonator...
5165478 Downhole activated process and apparatus for providing cathodic protection for a pipe in a wellbore  
This invention relates to a downhole activated device for providing cathodic protection for pipes in a wellbore for the production of hydrocarbons. The downhole activated devices are carried...
5165475 Method for the control of solids accomanying hydrocarbon production from subterranean formations  
A method for gravel packing a wellbore where a resin-coated sand or "gravel" is utilized. First, the wellbore is perforated at the productive interval in a manner sufficient to hydraulically...
5161616 Differential firing head and method of operation thereof  
A differential firing head for a tubing conveyed perforation assembly includes a pressure-balanced firing pin propelled by a separate actuator assembly into a detonator to ignite charges in the...
5161614 Apparatus and method for accessing the casing of a burning oil well  
An apparatus for providing access to the casing of a burning oil well near the wellhead includes a sled-like carriage which is moved over the ground surface into a position straddling the well...
5158139 Well completion method and fluid loss control composition  
Polymers used to prevent fluid loss from boreholes may be eliminated after a predetermined time by including with the polymer composition halogen-substituted organic acids or their salt...
5156213 Well completion method and apparatus  
A monobore completion system where the well is completed using a tubing conveyed perforating completion system having an automatic gun release and support for the tubing conveyed perforating guns.
5150755 Milling tool and method for milling multiple casing strings  
A cutting tool (22) includes a plurality of pivoted blades (36) for swinging outwardly to an expanded radial position for first cutting the walls of multiple casing strings (10, 11), and then...
5148868 Method and apparatus for perforating tubing  
The invention, as set forth in this disclosure, includes a perforating assembly for perforation of well tubing. This perforating assembly can be dropped by hand without attachments of any kind....
5141054 Limited entry steam heating method for uniform heat distribution  
A well completion method is claimed for steam stimulation of a wellbore, either horizontal or vertical, where limited entry perforations are utilized. Limited-entry perforations of specified...
5131472 Overbalance perforating and stimulation method for wells  
A method if disclosed for decreasing the flow resistance of a subterranean formation surrounding a well. A high fluid pressure is suddenly applied to the formation and fluid is pumped into the...
5131470 Shock energy absorber including collapsible energy absorbing element and break up of tensile connection  
A shock absorber is adapted to be disposed within a perforating gun string or within the tubing string above the perforating gun and includes an energy absorbing element adapted to absorb and...
5127473 Repair of microannuli and cement sheath  
This invention relates to a method of repairing holes, channels, voids and microannuli in a cement sheath situated in the annular space between a casing and the wall of a wellbore penetrating a...
5117911 Shock attenuating apparatus and method  
An apparatus attenuates a shock, such as an impact load from an explosion, by undergoing plastic deformation and by serially dissipating energy from a plurality of surfaces. In a particular...
5115865 Method and apparatus for selectively actuating wellbore perforating tools  
In the representative embodiments of the several methods and apparatus of the invention disclosed herein, a movable detonating member is arranged to be selectively impelled against an...
5111881 Method to control fracture orientation in underground formation  
This invention relates to a procedure to control fracture orientation in underground formations to increase well productivity. The method is performed by hydraulically fracturing the formation and...
5107929 Drop off method for perforating gun capsule charge carriers  
A novel dropoff apparatus adapted for use in a perforating gun or other such apparatus adapted to be disposed in a borehole includes an embrittled carrier section connected to a further section of...
5105886 Method for the control of solids accompanying hydrocarbon production from subterranean formations  
A method for gravel packing a wellbore where a resin-coated sand or "gravel" is utilized. First, the wellbore is perforated at the productive interval in a manner sufficient to hydraulically...
5103911 Method and apparatus for perforating a well liner and for fracturing a surrounding formation  
A liner at the bottom of an oil or gas well is perforated and the surrounding formation is subsequently fractured by inserting into the liner a perforating and fracturing apparatus comprising a...
5103912 Method and apparatus for completing deviated and horizontal wellbores  
A method of completing a well is provided which utilizes a primary tool string and a secondary tool string. The primary tool string will include apparatus such as perforating guns and associated...
5101900 Sand control in wells with gas generator and resin  
In a well treatment method, a fluid is positioned in a wellbore have formation perforations in alignment with the portion thereof to be treated. A gas generator is positioned in proximity with the...
5088557 Downhole pressure attenuation apparatus  
A downhole pressure attenuation apparatus is provided by which the explosive and hydraulic peak pressure and quasi-static pressure pulses generated by perforating gun detonation are attenuated by...
5074355 Section mill with multiple cutting blades  
A section mill for cutting through well casing, the mill including multiple sets of cutting blades which are selectively engaged to continue cutting operations as blades dull. The cutting blade...
5074360 Method for repoducing hydrocarbons from low-pressure reservoirs  
The present method of drilling, completing and fracturing enhances the production from any reservoir where artificial lift devices are required. However, this method is most suitable for a low...
5070943 Apparatus and method for perforating a well  
A perforating gun and method permit a casing or liner within a well to be perforated even within a section obstructed by sand either before or after perforation. The perforating gun comprises a...
5062485 Variable time delay firing head  
The device of the present invention comprises first means for initiating a first combustive reaction which is actuated in response to a first pressure condition in at least a portion of the well...
5058680 Method of detonating a perforating apparatus on a tubing including lowering one end of a pump and a firing head into said tubing  
A perforating gun having no firing head and no primary explosives is attached to a tubing string and the tubing string is run into a borehole. A new pump apparatus, having a firing head, is run...
5052489 Apparatus for selectively actuating well tools  
In the representative embodiments of the several methods and apparatus of the invention disclosed herein, a movable detonating member is arranged to be selectively impelled against an...
5046563 Apparatus and method for cutting an object in a well  
A cutting tool to cut a tubular element in a well is constructed of pellets of less sensitive explosive material detonated by a pellet of a more sensitive explosive material. All the explosive...
5044388 Perforating gun pressure bleed device  
Hydraulic cylinder apparatus, including a ram and attached piercing element is chained and secured around a perforating gun. A hydraulic cylinder is pressurized to thereby drive the piercing...
5044437 Method and device for performing perforating operations in a well  
A method and device for perforating a wall of a well by use of a tool such as an explosive gun includes the use of an intervention set. This set has a perforating tool associated with a measuring...
5036918 Method for improving sustained solids-free production from heavy oil reservoirs  
A method for controlling formation fines when producing viscous oil from a consolidated or loosely consolidated formation having at least two wells therein. Both wells are perforated and...
5036917 Method for providing solids-free production from heavy oil reservoirs  
A method for controlling formation fines when producing heavy oil from an unconsolidated sand formation where at least two wells are utilized. Both wells are perforated and hydraulically fractured...