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7578349 |
Lightweight and compact subsea intervention package and method
The present invention discloses apparatus and methods for a lightweight subsea intervention package that may be installed using vessels with a smaller lifting capacity than semi-submersible...
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7389817 |
Riser control device
A riser control device, particularly designed to be used in connection with spool or horizontal production trees ( 12 ) for wells in sub-sea oil and gas installations. Within a housing ( 1,2 ) of...
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7325612 |
One-trip cut-to-release apparatus and method
Apparatuses and methods allow a downhole anchor device to be cut, released, and retrieved using a single one-trip cutter and removal assembly. The assembly preferably includes a cutter head...
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7225873 |
Coiled tubing cutter
A cutting module to sever a tubing in a well includes a piston and shear blade. The piston includes at least two moveable telescoping elements, which are adapted to expand the first piston from a...
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7178598 |
Device for a hydraulic cutting tool
A device for a hydraulic cutting tool ( 30 ) for cutting of at least one pipe ( 16, 18, 20 ) or tubular object beneath a water floor ( 10 ), wherein the cutting is carried out from a surface...
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7090019 |
Casing cutter
A subsea well casing cutting tool for use as part of a well abandonment procedure, the casing cutting tool deployable from a vessel located at a water surface, where in certain embodiments the...
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7036599 |
Method and apparatus for cutting underwater structures
A method for the cutting of underwater structures below the level of the sea bottom on which they are installed, comprises determining an ideal plane of cutting, having considered the...
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6926085 |
Safety system for underwater cutting
Apparatus for a method of cutting pipes underwater comprising jetting a jacket down over the pipe, blowing mud out from between the pipe and the jacket so the annulus between the pipe and the...
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6834721 |
System for disconnecting coiled tubing
A disconnect system for coiled tubing. A first end of the coiled tubing is disconnected from a second end of the coiled tubing by holding the coiled tubing in a stationary position at a first and a...
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6679328 |
Reverse section milling method and apparatus
A method and apparatus for milling a section of casing in an upward direction, utilizing a downhole hydraulic thrusting mechanism for pulling a section mill upwardly. A downhole motor and torque...
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6629565 |
Abandonment and retrieval apparatus and method
A well abandonment process for cutting and retrieving an offshore well casing, the process comprising: making a trip to the well wherein all of the following steps are performed, the steps...
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6601650 |
Method and apparatus for replacing BOP with gate valve
The present invention discloses apparatus and methods for replacing a BOP with a gate valve to thereby save space, initial costs, and maintenance costs that is especially beneficial for use in...
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6554073 |
Method and apparatus for removing wellhead assemblies
A method of cutting a well casing located beneath a subsea wellhead wherein a cutting assembly is made and lowered into an operative position. A mounting device is secured to the wellhead and the...
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6439313 |
Downhole machining of well completion equipment
A method of machining a workpiece in a subterranean wellbore comprises the steps of: (a) providing a workpiece that comprises (1) a first section that comprises a first material, and (2) a second...
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6357528 |
One-trip casing cutting & removal apparatus
A one-trip system for removing casing from a wellhead is described. The string includes a cutting device spaced at the required depth and a grappling device above it at the appropriate location. A...
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6330919 |
Method of removing wellhead assemblies and cutting assembly for use therein
A method of cutting a well casing located beneath a subsea wellhead wherein a cutting assembly is made and lowered into an operative position. A mounting device is secured to the wellhead and the...
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6145594 |
Gate valve for subsea completion system
A caisson gate valve (10) fitting within an outer casing (12) extending downwardly from a subsea wellhead below the sea floor is disclosed. The gate valve (10) includes a valve body or block (14)...
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6056049 |
Wellhead retrieving tool
A wellhead retrieval tool is disclosed which is adaptable to a variety of configurations of wellheads. The tool comprises a spear through which a rotary cutter can operate. The tool can be...
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5979943 |
Shearable completion riser joint
The present invention refers to a completion riser joint (1) shearing by the shear ram of the blow-out preventer (BOP) (2), to be coupled, at its lower part, to the column hoist running tool and,...
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RE35542 |
Pipe bursting and replacement method
Tool for slitting and laterally expanding underground steel gas mains and inserting replacement plastic piping into the spread apart pipeline has a forward end cylindrical portion mounting a...
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5525010 |
Method and apparatus for severing tubular members
A method and apparatus for severing tubular members below a mud line. The mud is evacuated from the target area of the tubular member and the apparatus is lowered through the inner opening of the...
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5318115 |
Casing cutting and retrieving tool
A casing cutting and retrieving tool is described which includes a grapple device (2) for mechanically gripping casing to be retrieved. A mud motor having upper and lower stators (70, 73) and a...
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5303776 |
Device for a down-hole assembly
A wireline conveyable device for a fluid operable borehole tubing assembly comprising a tubular body having a first end intended to form the upper end when in the borehole and a second open end...
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5238069 |
System for preventing cutting gas explosion during subterranean pipe cutting operations
An apparatus and system designed to prevent cutting gas buildup and explosion of same during the cutting of underwater abandoned wellheads and the like. The present system as configured is...
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4987956 |
Apparatus for use in drilling a well at an offshore location
Apparatus is disclosed for use in drilling an offshore well wherein a drill string suspended from a drill ship for extension within a riser pipe, lower marine riser package and subsea wellhead...
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4909320 |
Detonation assembly for explosive wellhead severing system
A detonation assembly for an explosive wellhead severing system which employs a battery pack lowerable through a drill string to engage and power the detonation assembly positioned within the well...
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4789268 |
Device and method for removing irregularities in or enlarging an underground duct
A device for removing irregularities in or enlarging a buried duct comprises a cylindrical housing corresponding approximately in diameter to the required diameter of the duct, an expandable shell...
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4703802 |
Cutting and recovery tool
A cutting and recovery tool for a well-head, having a housing which is adapted to engage with a side wall of the well-head to lock them together, and a mandrel extending through the housing and...
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4528910 |
Apparatus for cutting a submerged tube by means of a pyrotechnic charge
Apparatus for the pyrotechnic cutting of a submerged tube. The apparatus, which is introduced into the tube, comprises in a conventional manner a chassis on which is mounted a support for a...
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4323117 |
Method and means for emergency shearing and sealing of well casing
Natural gas deposits vented by oil or gas wells may pressurize a well beyond the capacity of installed apparatus to contain damage in the event of equipment failure, blow-out, or fire with the...
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4215749 |
Gate valve for shearing workover lines to permit shutting in of a well
A gate valve which is mounted on a wellhead assembly and which may be closed to shear off workover lines, macaroni tubing and other suspension members so as to quickly shut in a well under...
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4191255 |
Method and apparatus for cutting and pulling tubular and associated well equipment submerged in a water covered area
A method and apparatus for cutting and recovering tubular and associated well equipment submerged in a water covered area including the steps of lowering a well string including a cutting tool, a...
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4181196 |
Method and apparatus for recovery of subsea well equipment
Method and apparatus are disclosed for recovering submerged equipment, such as a guide base and wellhead used in offshore well operations. A recovery tool, which includes an elongated member...
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3983936 |
Method of and apparatus for cutting and recovering of submarine surface casing
The method of and apparatus for cutting and recovering submarine surface casing and associated equipment on the ocean floor included the steps of lowering a string into the surface casing which...
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3870098 |
Remotely controllable subterranean oil well valve
An oil/gas well flow control apparatus adapted for placement below ground is capable of sealing the well pipe in the event of a fire or blowout. A pipe shearing means is positioned so as to extend...
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3782459 |
METHOD FOR CUTTING AND RETRIEVING PIPE FROM A FLOATING DRILL SHIP
A method and apparatus for cutting and retrieving a well pipe (having connecting collars and disposed within a well bore) from a floating drill ship utilizing a drill string, slack joint, downhole...
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3766978 |
REMOTE CONTROLLED OIL WELL PIPE SHEAR AND SHUT-OFF APPARATUS
In an offshore oil well production system including a surface platform, a submerged wellhead, and a pipe string interconnecting the wellhead and platform, the provision of a pipe shear and shut-off...
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3720260 |
METHOD AND APPARATUS FOR CONTROLLING AN OFFSHORE WELL
An improved system and method for bringing uncontrolled offshore wells under control is disclosed and includes subsurface bifurcated equipment for attachment to the pipe strings. The equipment...
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3664423 |
TIE-BACK SYSTEM FOR UNDERWATER COMPLETION
The tie-back collar of an inner casing is provided with a protector sleeve which is sealed in place and supported against rotation. To temporarily abandon the well after the annulus between the...
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3489211 |
METHOD AND APPARATUS FOR PARTING SUBSURFACE WELL CASING FROM FLOATING DRILLING VESSELS
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3461958 |
METHODS AND APPARATUS FOR INSTALLATION AND REMOVAL OF PREVENTER STACKS IN OFFSHORE OIL AND GAS WELLS
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3387459 |
Self-adjusting tripod structure for supporting an underwater well conductor pipe
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3378072 |
Method and apparatus for severing well casing in a submarine environment
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3376927 |
Pipe cutting apparatus and methods
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3338305 |
Method and apparatus for cutting casing in underwater installations
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3336976 |
Wellhead constructions
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3330339 |
Method of removing a wellhead assembly from the ocean floor
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3299954 |
Method and apparatus for hanging a well casing in a well bore
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3223164 |
Method of actuating fluid pressure operated mechanism of underwater well installation
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3163217 |
Method and apparatus for hanging pipe in an underwater well
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