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4657089 Method and apparatus for initiating subterranean well perforating gun firing from bottom to top  
A method and apparatus for effecting the firing of a perforating gun having a plurality of vertically spaced, shaped charges wherein the firing is accomplished from the lowermost shaped charge to...
4651824 Controlled placement of underground fluids  
A method of controlling subterranean placement of underground fluids, such as liquids, includes (a) positioning a tubing joint longitudinally in a borehole in the earth to locate the split and gun...
4648454 Robot  
A remotely controllable travelling robot for operation inside a pipe or bore-hole has a tool mounting assembly (22) which is rotatable in support structure (14, 16) about a longitudinal axis. The...
RE32336 Method and apparatus for conducting logging or perforating operations in a borehole  
A method and apparatus for conducting logging or perforating operation in a borehole, particularly a deviated borehole, includes lowering a length of drill pipe having the well-logging tool, or...
4637468 Method and apparatus for multizone oil and gas production  
A lower formation of a multizone well is perforated by a perforating gun lowered by wireline, and then fractured. A packer (modified Pengo packer) with a central bore and a valve seat is...
4633951 Well treating method for stimulating recovery of fluids  
Subterranean oil and gas producing formations are fractured by providing one or more combustion gas generating units using rocket fuel type propellants disposed in a well casing at preselected...
4629001 Tubing pressure operated initiator for perforating in a well borehole  
In a tubing conveyed perforating gun assembly having shaped charges to perforate a well, an improved pressure sequence shaped charge detonator is included. The preferred form of device is appended...
4629009 Method and apparatus for firing borehole perforating apparatus  
Method and apparatus for firing perforating apparatus in a borehole. A mechanically operated firing assembly is run into the borehole on the end of a cable and latched onto a perforating...
4627496 Squeeze cement method using coiled tubing  
A squeeze cementing method wherein the well tubing does not have to be pulled from the well so no workover rig is needed; a smaller volume of squeeze cement is required; the pressures involved in...
4621692 Water soluble perforation pack  
Disclosed is a process of minimizing damage of the formation surrounding perforation channels in a subterranean formation during workover and completion operations when the need exists to...
4619318 Chemical cutting method and apparatus  
A downhold chemical cutting process for cutting a target object within a well. A source of a gaseous chemical cutting agent comprising a nitrogen fluoride is introduced into the well adjacent the...
4619333 Detonation of tandem guns  
Method and apparatus for perforating a cased borehole in a single trip into the well include two or more strings of perforating guns supported within the wellbore. The strings of guns are attached...
4616701 Well perforating apparatus including an underbalancing valve  
A well perforating apparatus includes an underbalancing valve for opening ports in a tubing string immediately subsequent to the firing of a perforating gun, and comprises a hollow conduit having...
4612992 Single trip completion of spaced formations  
Two or more spaced formations located downhole in a borehole are completed by employment of a string of perforating guns and by making a single trip to the wellbore. An upper and a lower gun...
4613394 Staged chemical pipe cutter  
Discloses an improved tool and method for cutting material by expelling a jet stream of liquid chemical reactant into forceful flowing connection and chemical reaction with a designated area of...
4611660 Wireline conveyed firing mechanism for well perforating gun  
A firing mechanism for a downhole perforating gun comprises two cooperating housing sections having closed end walls in abutment. The lower housing section contains a booster charge and the primer...
4606409 Fluid pressure actuated firing mechanism for a well perforating gun  
A compressed fluid pressure actuated firing mechanism for a well perforating gun comprises a hollow housing assembly defining a mounting for a primer, a hammer releasably secured above the primer...
4605074 Method and apparatus for controlling borehole pressure in perforating wells  
A method and apparatus for controlling pressure in a borehole during perforation to provide means for maintaining a fluid column above the perforating zone to control a blowout while isolating the...
4605067 Method and apparatus for completing well  
A well drilled with air or gas as a circulating medium traversing pay zones with greater than normal pressures or pressures such that hydrocarbons would permeate drilling fluids and cement is...
4598769 Pipe cutting apparatus  
Apparatus for cutting a pipe disposed in a pipe string extending from the surface of the earth down a borehole. The apparatus comprises a body having an elongate axis and being adapted to be...
4598771 Method and apparatus for firing a perforating gun and simultaneously recording the downhole pressure  
An improved downhole pressure measuring apparatus includes a flow tube conveying pressurized fluid from a fluid source on the surface into a borehole. The fluid flow and pressure is measured at...
4576233 Differential pressure actuated vent assembly  
A differential pressure actuated vent assembly is connected into an oil well tool string. In one form of the invention, the tool string includes a packer device, a perforating gun attached to the...
4574892 Tubing conveyed perforating gun electrical detonator  
For use with a tubing conveyed perforating gun assembly, a wireline manipulated electrically actuated detonator assembly traversing the interior of the tubing is described. In the preferred and...
4566544 Firing system for tubing conveyed perforating gun  
A drop bar firing system is provided with a drop bar retracting means that insures that the lower end of the drop bar cannot come into contact with the firing head after a misfire, as the drop bar...
4564076 Well completion method and apparatus  
A pipe string with a valve, pressure responsive member, packer, firing mechanism and perforating gun are suspended within a well to complete the well. The packer is set to form an upper and lower...
4560000 Pressure-activated well perforating apparatus  
A well perforating technique utilizes a predetermined pressure difference developed at different points in the borehole to actuate the firing mechanism of a tubing conveyed perforating gun. A...
4560934 Method of transporting a payload in a borehole  
Bore hole instrument and methods of manufacturing and using the same. The instrument includes an elongated flexible probe which is inserted into a bore hole and can travel freely around bends of...
4559149 Workover fluid  
The high temperature water loss property of alkaline well completion and well workover fluids is improved by the addition of an effective amount of a naphthalene sulfonate formaldehyde condensate...
4557331 Well perforating method and apparatus  
A method and apparatus for effecting the perforation of a well casing and the adjoining production formation comprises a tubular housing communicating between a perforating gun housing and the...
4554981 Tubing pressurized firing apparatus for a tubing conveyed perforating gun  
A tubing pressurized firing apparatus is shown for use with a tubing conveyed perforating gun of the type used to perforate a cased well bore. The firing apparatus has a tubular body with an upper...
4554975 Hold down apparatus for wireline operated gun  
A hold down apparatus for a wireline operated perforating gun which prevents the gun from being thrust uphole when the gun is fired. The hold down apparatus enables the gun to be run downhole in a...
4553596 Well completion technique  
A method of preventing collapse of performation tunnels extending from a well bore into a subterranean formation by filling the tunnels with self-consolidating resin coated particles and curing...
4552234 Spiral gun apparatus  
A perforating gun for use in well bores and having a perforating means disposed in a azimuthal dispersion pattern about a vertical axis where the dispersion is characterized by azimuthal spacing...
4544034 Actuation of a gun firing head  
The method and apparatus for actuating a perforating gun by pressure includes a pressure actuated gun firing head disposed on the perforating gun for detonating the shaped charges of the gun. The...
4541487 Well perforating methods  
A well completion method comprising suspending NaCl crystals in the interval of the well bore to be perforated where the NaCl crystals are sized to bridge the perforations when the hydraulic...
4541486 One trip perforating and gravel pack system  
A method and apparatus effecting the perforating of a well casing and the gravel packing of the perforated areas of the well casing with one trip into the well of a combined perforating and gravel...
4540051 One trip perforating and gravel pack system  
The invention provides a method and apparatus for effecting the perforating of a well casing and the gravel packing of the perforated areas of the well casing with one trip into the well of a...
4537255 Back-off tool  
A back-off tool comprising an explosive contained in a tubular housing which will disintegrate into fine particles upon detonation of the explosive. The explosive may be in the form of pellets so...
4534423 Perforating gun carrier and method of making  
A perforating gun carrier comprising an inner substantially tubular housing within an outer substantially tubular sleeve. The inner housing includes gun ports extending through the wall thereof in...
4531583 Cement placement methods  
A method for use in a cased well bore for placing cement in a vertical channel existing in the annulus between the casing and a well bore to seal off vertical channels in a prior cement job. In...
4531585 Safety shear apparatus and method for production wells  
An apparatus and method for shutting in a well in the event all other control equipment on the well fails to close and hold. The apparatus includes a lower and upper tubing head in which the...
4526233 Releasable coupling for tubing conveyed subterranean well perforating gun  
A method and apparatus for releasing a subterranean well perforating gun from a tubular string after firing of the subterranean well perforating gun. The apparatus comprises two telescopically...
4524324 Downhole instrument including a flexible probe which can travel freely around bends in a borehole  
Bore hole instrument and methods of manufacturing and using the same. The instrument includes an elongated flexible probe which is inserted into a bore hole and can travel freely around bends of...
4523643 Well perforating and completion apparatus and associated method  
A well perforating and completion apparatus includes a packer connectable to the lower end of a tubing string, a vent assembly connected below the packer for communication between the tubing...
4515217 Perforating gun pressure activated sliding sleeve  
A method and apparatus for effecting the perforation of a well casing and the adjoining production formation comprises a tubular housing connected between a perforating gun housing and the lower...
4512406 Bar actuated vent assembly  
A vent assembly is positioned downhole in a borehole in underlying relationship with respect to a packer device. The vent assembly is connected within a production tubing string and a perforating...
4510999 Well cleanup and completion method and apparatus  
A cased borehole has a perforating gun suspended in underlying relationship relative to a packer device. A tubing string has a seal assembly connected to the lower end thereof, and an extension...
4509604 Pressure responsive perforating and testing system  
In accordance with an illustrative embodiment of the present invention, a well perforating and testing system includes packer and test valve means for respectively isolating a well bore interval...
4502550 Modular through-tubing casing gun  
A novel and improved form of through-tubing perforating assembly conformable for use in various types of cased well bores having particular application in those in which a tubing string is...
4501331 Method of completing a well  
A packer actuated vent assembly comprising an outer barrel attached to a packer body, and a mandrel extension attached to the lower end of the mandrel of the packer. A valve means on the mandrel...