921 results about "Workover" patented technology

The invention belongs to the field of oil equipment, and particularly relates to a fully hydraulic intelligent workover rig. The fully hydraulic intelligent workover rig is characterized in that an engine 2 and a hydraulic pressure station 5 are installed on a chassis truck 1, in the conveying state, a walkway is folded automatically and stored, a wellhead assembly is fixed to the tail of the chassis truck, after the hydraulic workover rig is moved to a well site, a wellhead is subjected to initial positioning through a reverse image in a cab and positioning and ranging, and then accurate positioning is conducted by moving a rapid positioning device through a derrick; by conducting height adjusting and supporting on a vehicle carrying chassis through hydraulic adjusting landing legs and conducting mechanical locking, rapid positioning and locking of the wellhead are achieved; the automatic folding walkway is designed, and convenient and labor-saving installation is achieved; increasing and decreasing of pressure of a string in a well and setting and control of bit pressure and drilling speed parameters can be achieved automatically, full automatic operations such as tubing string gripping and conveying, automatic fastening and unfastening, automatic discharging and automatic detection are achieved; integrated transport of a blowout preventer is achieved, and separate disassembly and transport are not needed.

A retrievable frac mandrel and a well control adapter are used to efficiently accomplish well completion, re-completion or workover. The retrievable frac mandrel is inserted in a tubing head spool of a well to be completed, re-completed or re-worked. The well control adapter is mounted to a top of the tubing head spool and seals off against a top of the retrievable frac mandrel. After well completion, re-completion or workover is completed, the frac mandrel can be retrieved from the tubing head spool without killing or plugging the well.

A self-supported riser system (100) for an Anticipated Production System (ASP) Test or a Long Duration Production (LDP) Test in a subsea petroleum production system, utilizing an ANM coupled to a wellhead and Floating Production Unit (FPU) is disclosed. The system includes a wellhead at the seabed, connected to an ANM (20) provided with a preventor (BOP of workover) (30). The preventor (30) is connected to a production riser (50) through a connection tool (40). The riser (50), mounted internally within a buoy assembly (60), is maintained under traction with the aid of a buoy assembly. The upper end of the riser (50) is provided with a Subsea Intervention Terminal (700), the Terminal being interlinked to the FPU by a flexible jumper (90) to carry the oil produced to the FPU. Two methods for installing the self-supported riser system (100) are also disclosed.

A gas and oil recovery system including a vessel, platform or rig, with a rig floor, a riser including a pipe that extends from the vessel, platform or rig to a x-mas tree on top of a well head and via which a wire or coiled tubing is fed down into a well. The riser is movable through an opening in the rig floor, and a surface flow head connected to the riser and to a wire line or coiled tubing equipment. The surface flow head is arranged to be run through the opening in the rig floor.

A subsea production system adapted for wireless communication so that production tree operation can be controlled locally wirelessly from a workover umbilical or remotely controlled vehicle. The production system includes a wellhead assembly and an umbilical termination connected to an umbilical that extends to above the sea surface. Dedicated wireless communication devices can be attached to one or both of the wellhead assembly and the umbilical termination. The wireless communication devices can include a radio frequency modem, a sonar device, an infrared communication device, a light emitting diode, an optical modem, and combinations thereof; the wireless communication can include radio frequency waves, acoustic waves, and electromagnetic waves. A subsea control module can be included for controlling/actuating devices in or associated with the production system. The subsea control module can be adapted for wireless communication.

A drilling fluid compound, for use as an additive in a water-based drilling mud system, comprises a neat (B100) biodiesel liquid at a concentration of at least 5% by volume, and is useful in downhole applications such as lubrication, spotting, shale inhibition, fluid loss control, and rate of penetration enhancement. A base fluid for a synthetic-based drilling mud system comprises a B100 biodiesel liquid at a concentration of at least 5% by volume. A polyalphaolefin, another isomerized olefin, a petrodiesel, a mineral oil, a mineral oil derivative, or combinations thereof, may also be included in the drilling fluid compound or in the base fluid, within suitable ranges. The compositions of matter satisfy the current environmental standards defined by the U.S. Environmental Protection Agency for drilling fluids.

A method is disclosed for reducing sag in drilling and completion fluids and in workover fluids. The method employs a drilling fluid comprising a low molecular weight polyalkyl methacrylate with an average molecular weight ranging from about 40,000 to about 90,000. This additive does not result in increased viscosity of the fluid.

An offshore jack-up workover rig. The workover rig includes a vessel which may be self powered or powered by a tug. The vessel may be raised above the surface of a water body by extending the legs until they reach the water body bed and then continuing to extend the legs. The workover rig contains a workover floor unit which includes at least a drawworks, a drawworks motor, and a well aperture. The workover rig is detachably mounted on an extensible cantilevered frame. The frame may be extended to position the workover floor unit over an offshore platform to be serviced. The workover floor unit is also configured to mover laterally relative to the extensible frame. The vessel is also provided with a crane. The crane may be used to lift the detachable workover floor unit from the vessel and deposit it, including its equipment, on the platform.

The invention relates to hydrolysable high elasticity well workover liquid temporary blocking agent used in oil field workover treatment. It is made up of 40-80% de-ionized water, 10-30% acrylic acid, 8-30% starch, 0.1-1.5% sodium per-sulfate, and 0.1-1.0% N,N-methylene-bisacrylamide. The water-bearing of the product is 40%-80%. It can be degraded easily in water, and can lose full strength in 24 hours below 60 centigrade degree. The degraded residue is little and has low system viscosity.

A slip joint for a riser between a well and a floating petroleum installation, for example an oil platform. The slip joint includes, an outer pipe and an inner pipe, the pipes arranged to enable telescopic movement relative to one another in order to compensate for a change in distance between the sea bottom and the platform. The inner pipe is connected to a piston, the piston being operable in response to hydraulic pressure for inflicting a tensile force on riser. The outer diameter of the inner pipe is adapted to the diameter of outer pipe so as to form an annulus between the pipes. The piston is fixedly connected to inner pipe at or close to a downwardly directed end thereof, the annulus and the piston being subjected to hydraulic pressure. A protective sleeve is provided below the piston, which is slippingly arranged within outer pipe.

The combination workover and drilling rig of the present invention combines a capability to drill a well, as well as perform well maintenance and service, using either or both tubing with threaded tubular connections or coiled tubing. A mast and a coiled tubing injector are independently mounted to a support platform and can be operated independently of each other. The coiled tubing injector is selectably elevatable into a stowed position, a ready position, or an operating position.

The technology disclosed herein provides a multiple sensor system that prevents crown incursion by a traveling block in an oil rig. This system calculates traveling block position, traveling block velocity and weight supported by the traveling block, and uses this information to calculate emergency stopping positions to prevent crown out by the traveling block. The system takes all these parameters into consideration when slowing and/or stopping the traveling block when it reaches a crown out position. The result is much safer operation of the traveling block on a workover rig, as well as on an oil drilling rig.

The invention relates to an automatic running and pulling system of an oilfield workover string, which comprises a blowout preventer, fixing slips, an oil pipe/sucker rod guide mechanism, an oil pipe/sucker rod locating mechanism, an oil pipe/sucker rod elevator component, a mechanical arm component, hydraulic clamps, a hydraulic clamps bracket, a control system, a base component and a string bent, wherein the mechanical arm component and the hydraulic clamps bracket are installed on the base component and are connected through a linkage component to carry out linkage movement, and the string bent is arranged on the side surface of the mechanical arm component and moves in match with the mechanical arm component. With the adoption of the automatic running and pulling system of the oilfield workover string, the automation of movements of snatching up, butt joint, clamping, upper unloading, elevating, lowering, arrangement and the like can be realized, manual string running and pulling operation at a wellhead is replaced, an equipment mechanism is simplified as much as possible, and an operation program is optimized.

A portable hydraulic rig for workover, drilling or other operations on existing wells in which the rig has a derrick elevated on a base structure comprised of containers for equipment used in association with drilling or workover activities, a work platform including pipe rack sections for storing a plurality of pipes, the derrick being open-sided with a power cylinder at its upper end for lifting and lowering pipe sections away from and into each well, and hydraulic drive cylinders for advancing the rig between wells without telescoping or pivoting the derrick into a travel position, all of the hydraulic components being controlled from a central control panel on the work platform.

The invention discloses a workover operation mechanization system replacing well mouth manual operation, which mainly solves the problem that mechanization and automation can not be realized when the well mouth operation is carried out in the existing well reparation. In the invention, an opening power tong, a power slip, a lift sub for conveying tubular column and a mobile mechanism of a conveying power tong are integrated; the power tong comprises a main tong and a backup tong, and is installed on the mobile mechanism; the lift sub is connected on a derrick through a big hook; the upper layer of a mobile mechanism is a working machine; the lower layer thereof is a base; the two layers can move relatively; the power tong is installed on the upper layer; the top part of the upper layer isprovided with a righting machine hand used for adjusting the position when the tubular column is loaded and uploaded; the movement of the power tong is finished through the mobile mechanism when the tubular column is loaded and uploaded; and the top part of the mobile mechanism is provided with a righting machine hand which is matched with the lift sub to move the tubular column when the tubular column is loaded and uploaded. The system of the invention improves automation degree of the tubular column loading and uploading, and improves the accuracy of the position of tubular column movement of the tubular column loading and uploading, and increases economic benefits.

This invention relates to a wellbore treatment fluid and a method of enhancing wellbore treatment fluids to increase efficiency and productivity of wells. More specifically this invention provides methods for enhancing the thermal stability of wellbore treatment fluids such as drill-in, completion, workover, packer, well treating, testing, spacer or hole abandonment fluids. The methods include providing a wellbore treatment fluid that comprises polyol, polysaccharide, weighting agent, and water, wherein the fluid is solids free.

A selectably elevatable coiled tubing injector is described that is suitable for a mobile self-contained unitized coil tubing rig for the drilling and workover of petroleum wells. The selectably elevatable coiled tubing injector includes a mechanism for positioning a trailer mounted coiled tubing injector either in a first stowed position on the deck of the transport trailer or in a second position resting on an elevated rig floor of a drilling rig. Furthermore, the selectably elevatable coiled tubing injector includes a further mechanism for selectably elevating the injector above its second position on the rig floor while clamping the tubing in order to provide additional tension on the tubing string or to raise the tubing deployed within a well.

A retrievable frac mandrel and a well control stack are used to efficiently accomplish well completion, re-completion or workover. The retrievable frac mandrel is inserted in a tubing head spool of a well to be completed, re-completed or re-worked. The well control stack is mounted to a top of the tubing head spool and seals off against a top of the retrievable frac mandrel. Once well completion, re-completion or workover is completed, the frac mandrel can be retrieved from the tubing head spool without killing or plugging the well.

A system and method for actuating a shut-off valve in a wellbore wherein the shut-off valve element can be positively closed before the pump is removed from the well. A hydraulic actuator component is operably associated with the shut-off valve to provide for selective isolation of the well by positive closing of the valve prior to removal of the pump and opening of the valve after replacement of a pump within the wellbore. The hydraulic actuator component has a balanced hydraulic design wherein the valve closure element may be moved toward an open or closed position by flow of hydraulic fluid through first and second hydraulic lines. When a repaired pump or replacement pump is placed into the well, the actuator is stabbed into a packer element to seat it. The hydraulic actuator assembly is then operated to open the shut-off valve, thereby reestablishing well operation.