8657 results about "Wellhead" patented technology

A process is disclosed for the in situ conversion and recovery of heavy crude oils and natural bitumens from subsurface formations using either a continuous operation with one or more injection and production boreholes, which may include horizontal boreholes, or a cyclic operation whereby both injection and production occur in the same boreholes. A mixture of reducing gases, oxidizing gases, and steam are fed to downhole combustion devices located in the injection boreholes. Combustion of the reducing gas-oxidizing gas mixture is carried out to produce superheated steam and hot reducing gases for injection into the formation to convert and upgrade the heavy crude or bitumen into lighter hydrocarbons. Communication between the injection and production boreholes in the continuous operation and fluid mobility within the formation in the cyclic operation is induced by fracturing or related methods. In the continuous mode, the injected steam and reducing gases drive upgraded hydrocarbons and virgin hydrocarbons to the production boreholes for recovery. In the cyclic operation, wellhead pressure is reduced after a period of injection causing injected fluids, upgraded hydrocarbons, and virgin hydrocarbons in the vicinity of the boreholes to be produced. Injection and production are then repeated for additional cycles. In both operations, the hydrocarbons produced are collected at the surface for further processing.

In one embodiment, a method for drilling a wellbore includes an act of drilling the wellbore by injecting drilling fluid through a tubular string disposed in the wellbore, the tubular string comprising a drill bit disposed on a bottom thereof. The drilling fluid exits the drill bit and carries cuttings from the drill bit. The drilling fluid and cuttings (returns) flow to a surface of the wellbore via an annulus defined by an outer surface of the tubular string and an inner surface of the wellbore. The method further includes an act performed while drilling the wellbore of measuring a first annulus pressure (FAP) using a pressure sensor attached to a casing string hung from a wellhead of the wellbore. The method further includes an act performed while drilling the wellbore of controlling a second annulus pressure (SAP) exerted on a formation exposed to the annulus.

A wellhead is formed by extruding a plurality of tubular liners off of a mandrel into contact with an outer casing. The first tubular liner and mandrel are positioned within the wellbore with the tubular liner in an overlapping relationship with the outer casing. At least a portion of the tubular liner is extruded off of the mandrel into contact with the interior surface of the outer casing. The first tubular liner is extruded off of the mandrel by pressurizing an interior portion of the first tubular liner. Subsequent tubular liners are positioned in concentric overlapping relation and similarly extruded off of a mandrel into at least partial contact with the interior surface of the outer casing.

A method of dynamically controlling open hole pressure within a wellbore having a drill string positioned therein. The method comprising the steps of pumping a fluid down the drill string, into an annulus formed by the drill string and the interior of the wellbore, and then subsequently up the annulus to the surface of the ground; selectively applying wellhead pressure to the annulus through selectively pumping an additional quantity of the fluid or a quantity of a secondary fluid across the annulus; and, controlling the application of wellhead pressure applied to the annulus by controlling one, or both, of (a) the operation of a wellhead pressure control choke, and (b) the flow rate of the additional quantity of fluid or the secondary fluid pumped across the annulus, to thereby maintain open hole pressure within a desired range.

The invention discloses a composite drive mandrel anchoring casing head and relates to the technical field of wellhead devices, the composite drive mandrel anchoring casing head comprises a casing head shell and an anchoring mandrel unit, a pressurizing hole is further formed in the side wall of the casing head shell, the first end of the pressurizing hole is connected with an anchoring hole part,and the second end of the pressurizing hole extends to the outer side of the casing head shell. The anchoring mandrel unit comprises an anchoring mandrel body, a slip exciting piece, an anchoring slip and an annular piston body, wherein the slip exciting piece, the anchoring slip and the annular piston body are sequentially arranged on the outer side of the anchoring mandrel body from top to bottom in a sleeving mode. The casing head can meet the hanging requirement of a mandrel hanger, after the anchoring mandrel body and the casing head shell are anchored, pipe column shifting can be avoided, and the stability and the reliability of the casing head are improved.

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.

The invention discloses an oil field fracturing system with antifreezing performance. The oil field fracturing system comprises a clear water tank, a mixing vehicle, a buffer tank, a sand mixing vehicle, a fracturing device, a well mouth and a throttling manifold, wherein the outlet of the clear water tank is connected with the inlet of the mixing vehicle, the outlet of the mixing vehicle is connected with the inlet of the buffer tank, and the outlet of the buffer tank is connected with the inlet of the sand mixing vehicle, the outlet of the sand mixing vehicle is connected with an inlet of the fracturing device, a plurality of flanges are arranged at the well mouth, and one flange of the well mouth is connected with the throttling manifold, the other flanges of the well mouth are connected with the outlet of the fracturing device, and the outlet of the throttling manifold flows back to the clear water tank to form a closed circulation system. The oil field fracturing system has the beneficial effects that the liquid can be rapidly heated by adopting a steam automobile, so that the guanidine gum is fully swelled; and when there is no construction at night, the normal operation of the equipment is guaranteed by adopting the full-pipeline circulation and heat preservation, the pipeline is prevented from being disassembled, and equipment freeze-plugging is prevented.

The invention discloses a fracturing system with the antifreezing performance. The fracturing system comprises a first branch and a second branch, wherein the first branch comprises a clear water tank, a mixing truck, a buffer tank, a sand blender, a fracturing device, a first cock and a throttle manifold connected in sequence; the outlet of the throttle manifold enters the clear water tank through backflow, to form a closed circulating system; the second branch comprises a hot melting wax truck, a dual-machine pump truck, a coiled tubing and a wellhead; the hot melting wax truck, the dual-machine pump truck and the coiled tubing are sequentially connected; the coiled tubing penetrates through the wellhead to enter the shaft bottom; the wellhead in the second branch is connected with the inlet end of the first cock in the first branch through a high-pressure pipeline; and the high pressure pipeline is provided with a second cock close to the inlet end of the first cock. The fracturingsystem has the following beneficial effects: during the construction process, a steamer is adopted to fully swell guanidine gum; and when construction is not carried out, all pipelines are adopted torealize antifreezing and thermal insulation in a circulating manner to avoid pipeline dismantling.

According to one aspect, a system is adapted to actively control one or more operating parameters associated with: a wellbore extending in a subterranean formation, and/or wellbore fluid flowing out of the wellbore via a wellhead. The system includes one or more sensors; an electronic controller adapted to receive from the one or more sensors measurement data; and a valve through which the wellbore fluid is adapted to flow. The valve is adapted to be in communication with the electronic controller. The active control of the at least one of the one or more operating parameters is adapted to facilitate: maintenance of the integrity of the wellbore, and/or enhancement of oil and/or gas production out of the wellbore. In one embodiment, the wellbore fluid flow is frac flow-back. In another aspect, a system is adapted to monitor vent gas separated from wellbore fluid flowing out a wellhead.

The invention belongs to the field of petroleum equipment, and particularly relates to a fast positioning device for derrick moving. The fast positioning device for derrick moving is characterized inthat a derrick supporting seat can move in the transverse direction and the longitudinal direction of a chassis vehicle, and the derrick supporting seat integrates a blowout preventer group; and the blowout preventer group can lift, move and rotate around the center of the blowout preventer group, and a lifting cylinder of a derrick is supported on the derrick supporting seat, moves along with thesupporting seat and keeps unchanged relative to the position of the derrick. According to the fast positioning device for derrick moving, well opening aligning is conducted by adjusting the front, back, left and right positions of the derrick on a vehicle, fast and accurate positioning is achieved, in conclusion, a derrick supporting seat structure has the advantages of being reasonable in design, convenient and reliable to use, precise in positioning, automated in control and the like, the derrick can be fast aligned with a well opening, meanwhile, the well opening blowout preventer group isfixed to a fast positioning device, a telescopic liquid cylinder is collected during transported, the blowout preventer group is transported along with the vehicle, the efficiency of workover preparation work is improved, and the labor intensity of operators is reduced.

The present invention relates to a method for removing condensables from a natural gas stream, at a wellhead, downstream of the wellhead choke thereof. In accordance with the invention there is provided a method for removing condensables from a natural gas stream at a wellhead, the method comprising the steps of: (A) inducing the natural gas stream to flow at supersonic velocity through a conduit of a supersonic inertia separator and thereby causing the fluid to cool to a temperature that is below a temperature/pressure at which the condensables will begin to condense, forming separate droplets and/or particles; (B) separating the droplets and/or particles from the gas; and (C) collecting the gas from which the condensables have been removed, wherein the supersonic inertia separator is part of the wellhead assembly downstream of the wellhead choke. There is also provided a device for removing said condensables from said natural gas that is part of the wellhead assembly downstream of the choke, a wellhead assembly comprising said device.

A casing mandrel for an independent screwed wellhead includes a pin thread adapted for engagement with a box thread of a well stimulation tool lockdown nut for securing the well stimulation tool against the casing mandrel top end. A well stimulation tool and a tubing head spool for use with the casing mandrel are also provided. Safety of well stimulation procedures is thereby improved and well completion time is significantly reduced.

Systems and methods are provided for treating a wellbore using a loop system to heat oil in a subterranean formation contacted by the wellbore. The loop system comprises a loop that conveys a fluid (e.g., steam) down the wellbore via a injection conduit and returns fluid (e.g., condensate) from the wellbore via a return conduit. A portion of the fluid in the loop system may be injected into the subterranean formation using one or more valves disposed in the loop system. Alternatively, only heat and not fluid may be transferred from the loop system into the subterranean formation. The fluid returned from the wellbore may be re-heated and re-conveyed by the loop system into the wellbore. Heating the oil residing in the subterranean formation reduces the viscosity of the oil so that it may be recovered more easily.

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.

The present invention provides drilling systems for drilling subsea wellbores. The drilling system includes a tubing that passes through a sea bottom wellhead and carries a drill bit. A drilling fluid system continuously supplies drilling fluid into the tubing, which discharges at the drill bit bottom and returns to the wellhead through an annulus between the tubing and the wellbore carrying the drill cuttings. A fluid return line extending from the wellhead equipment to the drilling vessel transports the returning fluid to the surface. In a riserless arrangement, the return fluid line is separate and spaced apart from the tubing. In a system using a riser, the return fluid line may be the riser or a separate line carried by the riser. The tubing may be coiled tubing with a drilling motor in the bottom hole assembly driving the drill bit. A suction pump coupled to the annulus is used to control the bottom hole pressure during drilling operations, making it possible to use heavier drilling muds and drill to greater depths than would be possible without the suction pump. An optional delivery system continuously injects a flowable material, whose fluid density is less than the density of the drilling fluid, into the returning fluid at one or more suitable locations the rate of such lighter material can be controlled to provide supplementary regulation of the pressure. Various pressure, temperature, flow rate and kick sensors included in the drilling system provide signals to a controller that controls the suction pump, the surface mud pump, a number of flow control devices, and the optional delivery system.