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3997 results about "Wellhead" patented technology

A wellhead is the component at the surface of an oil or gas well that provides the structural and pressure-containing interface for the drilling and production equipment. The primary purpose of a wellhead is to provide the suspension point and pressure seals for the casing strings that run from the bottom of the hole sections to the surface pressure control equipment.

Upgrading and recovery of heavy crude oils and natural bitumens by in situ hydrovisbreaking

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.

Fully hydraulic intelligent workover rig

InactiveCN107476769ARealize grabbingRealize pipe deliveryDrilling rodsDrilling casingsBlowout preventerTruck
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.

Oil field fracturing system with antifreezing performance

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.

Fast positioning device for derrick moving

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.

Subsea wellbore drilling system for reducing bottom hole pressure

InactiveUS6854532B2Easy to deployFaster and effective subsea downhole operationDrilling rodsConstructionsDelivery systemBottom hole assembly
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.

Water discharging manhole cover capable of automatically hoisting

The invention provides a water discharging manhole cover capable of automatically hoisting. The water discharging manhole cover comprises a manhole cover, a manhole cover base, two spring hinging mechanisms, a manhole cover floating cabin, a rainwater collector and an alarming device, wherein the manhole cover base is fixedly arranged on a well opening of a water discharging well; the manhole cover is placed on the manhole cover base; the two spring hinging mechanisms are connected between the manhole cover and the manhole cover base; the rainwater collector is located below the manhole cover floating cabin; and the alarming device is arranged in a central hole of the manhole cover and a manhole cover floating cabin through hole in a penetrating manner. The manhole cover of the water discharging manhole cover is made of a high-strength and light-mass material and can be automatically opened and closed by the manhole cover floating cabin according to the water depositing amount above the manhole cover, namely the water discharging manhole cover has a function of automatically and vertically hoisting, so that the discharging capability of water deposited at a road surface is enhanced. Furthermore, the manhole cover is connected with the manhole cover base through the spring hinging mechanisms so that the manhole cover is prevented from being washed away by the water; and the alarming device is used for providing alarms to pedestrians and vehicles so that the safety is good. Furthermore, the water discharging manhole cover also has the advantages of reasonable and simple structural design, complete functions, convenience for maintenance and the like.

Drilling well control parameter intelligent monitoring system

InactiveCN101446191AJitter Errors Are UniformHigh precisionSurveyFlushingData platformDisplay device
The invention relates to a drilling well control parameter intelligent monitoring system which comprises a monitoring part for drilling fluid cycling volume, a monitoring part for drilling fluid inlet and outlet flow, a monitoring part for drilling fluid inlet density, outlet density, drilling temperature, outlet natural gas, and H2S concentration, a monitoring part for wellhead pitshaft flowing fluid level and table torque, and a collection instrument part. All the signals are transmitted into the collection instrument to be collected through an RS485 network cable; after data processing is carried out, the data is transmitted to a drill floor parameter display device and a central station host computer through a wireless data transmission device; the data storage, display and print are carried out by the host computer, and the data is simultaneously uploaded into a data platform processor of an upper-level command center; finally, remote control realtime processing and monitoring are carried out on all the well control parameters of all the drilling crews. The intelligent monitoring system has the beneficial effects of realizing omnibearing, long-distance and timely drilling well control, safe production, and playing better role in preventing the occurrence of accidents such as well kick, loss circulation, blow-out, etc.

Method for varying the density of drilling fluids in deep water oil and gas drilling applications

A method and system for controlling drilling mud density in drilling operations. The mud required at the wellhead is combined with a base fluid of a different density to produce diluted mud in the riser. By combining the appropriate quantities of drilling mud with base fluid, riser mud density at or near the density of seawater may be achieved, thereby permitting greater control over the pressure in the wellbore and various risers. Blowout preventers may also be used in combination with the process to control these pressures. Concentric risers are disclosed, wherein an annulus defined within one riser is utilized to carry the different density base fluid to the injection point for injection into the drilling mud, while an annulus defined within another riser is utilized to carry the combination fluid and cuttings back to the drilling rig. Cuttings are separated in the usual manner at the surface. The diluted mud is passed through a centrifuge system to separate drilling mud from the different density base fluid. The centrifuge system may also be utilized to separate the recovered drilling fluid into a substantially barite portion and a substantially drilling fluid portion, wherein the two portions are stored locally at the rig and recirculated during drilling operations.

Energized sealing cartridge for annulus sealing between tubular well components

A mechanically energized annular packoff seal cartridge for metal-to-metal sealing with substantially concentrically arranged tubular members, such as the tubular wellhead housing and well casing of an oil and gas well. A tubular pressure responsive energizing mandrel having downwardly converging frusto-conical seal actuating surfaces is of a dimension for entry into the annulus between the wellhead seal bore and the rough outer surface of the well casing. Elastomer seals are carried by the energizing mandrel and establish sealing of the energizing mandrel with the wellhead housing and well casing A pair of soft metal seal rings are carried by the seal cartridge and are forced radially into metal-to-metal sealing with the wellhead housing and the rough outer surface of the well casing respectively by the double tapered seal actuating surfaces responsive to pressure induced downward force on the energizing mandrel. A locking mandrel and the seal actuating mechanism are restrained against actuating movement during running of the seal cartridge by a running tool by shear pins, thus enabling the cartridge to pass through various well equipment. The shear pin of the locking mandrel is sheared by downward force applied by the running tool to lock the seal cartridge within the wellhead housing. The shear pin of the seal actuating mechanism is sheared, after locking of the cartridge to the wellhead housing, by the force of pressure introduced into the wellhead above the seal cartridge which acts to develop a pressure differential across the elastomer seals of the cartridge.
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