1623 results about "Wellhead" patented technology

The derrick type continuous oil pipe integrated sidetrack drilling operation device is provided with a base, a derrick, an injection head installation support, an injection head, a lifting oil cylinder, a hydraulic clamp and a remote operation room, one side of the derrick is fully opened, the derrick and the base are both of a lightweight rigid structure, and the injection head is installed at the top of the derrick for remote control. After the base is arranged at a wellhead and is unfolded and installed, one side of the base is connected with the lifting oil cylinder, the other side of the base is in butt joint with the ramp and the pipe rack, the derrick is rapidly erected through the lifting oil cylinder, and after the injection head is hoisted to the top of the derrick, the injection head is rapidly installed and subjected to alignment adjustment through the injection head installation support and the adjusting structure. Meanwhile, the tool rod and the elevator are arranged at the injection head, the tool rod is pulled and placed through the injection head, an oil pipe column and a sucker rod can be independently lifted or lowered, the oil pipe column and the sucker rod are pushed into a ramp from one side of an opening of a derrick, integrated sidetrack drilling operation of the coiled tubing is achieved, and sidetrack drilling efficiency and operation safety of the coiled tubing are remarkably improved.

The invention particularly relates to the technical field of multi-source data fusion, and discloses an intelligent deformation monitoring system for a well drilling wellhead rising short section flange, which comprises a multi-source data acquisition module, a data fusion processing module, an intelligent deformation analysis module, a digital twin modeling module, a risk grading early warning module and a man-machine interaction feedback module, a flange deformation associated data set is obtained through a multi-source data acquisition module, a multi-dimensional fusion feature set is constructed through a data fusion processing module, a flange deformation abnormal index is calculated in real time through an intelligent deformation analysis module, a three-dimensional model of a rising short section flange is constructed through a digital twin modeling module, and a three-dimensional model of the rising short section flange is obtained. A grading early warning strategy is formulated through the risk grading early warning module, monitoring data, an early warning signal and a three-dimensional model are displayed in real time through the man-machine interaction feedback module, and an operation interface is provided; all-directional data acquisition of flange deformation and associated environments is realized, the comprehensiveness of data monitoring is improved, the accuracy of deformation monitoring is improved, and the decision-making efficiency is improved.

The invention relates to the technical field of oil field workover treatment, in particular to a rapid blowout wrecking device and method for minor repair operation. According to the technical scheme, a lifting mechanism is installed on workover treatment equipment through a fixing mechanism, a rotary speed reducer is installed at the upper end of the lifting mechanism, a blowout wrecking rotating arm is installed on the upper portion of the rotary speed reducer, the outer end of the blowout wrecking rotating arm is fixedly connected with a fixing base, a turbine is installed in the fixing base, and a rotating short section is installed in the center of the turbine. The lower end of the rotary short section is movably connected with a full-bore plug valve; the worm is installed on one side of the turbine, the worm is driven by the hydraulic cycloid motor to rotate, the worm drives the turbine and the rotary short section to rotate, then the full-bore plug valve is driven to be rotationally connected to an oil pipe of a wellhead, then the switch knob is closed, and blowout wrecking is completed. The full-bore plug valve is installed through mechanical rotation, the follow-up loading function is achieved, potential safety hazards caused by manual installation of the full-bore plug valve are avoided, and rapid blowout wrecking work of blowout is achieved.

The invention relates to the technical field of oil and gas drilling, in particular to a drill rod transfer system and method for an ocean platform. The drill rod transferring system comprises a drill rod conveying device, a drill rod transferring device and a traveling hoisting assembly, the drill rod transferring device is arranged on one side of the drill floor face, the traveling hoisting assembly is installed on the drill floor face through a derrick, the drill rod conveying device is arranged above a pipe column storage yard, and therefore the position of the pipe storage yard does not need to be occupied, more drill rods can be placed in the pipe storage yard, and the construction efficiency is improved. Therefore, continuity and efficiency of drilling operation are improved. The drill rod conveying device can grab drill rods in a pipe column storage yard and reciprocate in front of the pipe column storage yard and the drill floor face, the drill rod conveying device is used for cleaning and buckling the drill rods, overturning and lifting the drill rods to be in a vertical state after oil coating, and the drill rod transferring device is used for grabbing the drill rods in the vertical state in the drill rod conveying device and transferring the drill rods to a well opening or a mouse hole. And therefore, the drill rod can be transferred from the pipe storage yard to the drill floor surface.

The invention discloses a throttling well killing control method and system, a storage medium and a program product, and relates to the field of intelligent control. According to the application, the control system collects wellhead pressure, casing pressure, throttle valve opening and shaft temperature gradient data; comparing the shaft temperature gradient data with a preset temperature reference curve to obtain a temperature deviation sequence, and performing Fourier decomposition on the temperature deviation sequence to obtain a main frequency component; on the basis of the main frequency component and a preset frequency threshold value, downhole flow situation parameters are determined, and a pressure dynamic compensation function is established according to the downhole flow situation parameters; the wellhead pressure and the casing pressure are input into the pressure dynamic compensation function, and the corrected wellhead pressure and the corrected casing pressure are obtained; and on the basis of the corrected wellhead pressure, the corrected casing pressure and the throttle valve opening, the throttle valve opening adjusting amount is calculated, the throttle valve is controlled to be adjusted according to the throttle valve opening adjusting amount, and therefore the reliability and accuracy of throttle well killing control are improved.

The invention discloses a system and a method for automatically measuring pipe network parameters based on three-dimensional scanning of a wellhead of an inspection well, and belongs to the technical field of municipal engineering measurement. The system comprises a wellhead fixing assembly, a three-dimensional laser scanning assembly, a posture sensing assembly, a distance measuring assembly, a coordinate input assembly, a control processing assembly and a telescopic rod assembly. According to the method, through system deployment leveling, coordinate reference establishment, working condition judgment, point cloud acquisition, data processing and result output, automatic measurement of inspection well depth, pipe network pipe diameter, pipeline trend and pipe orifice center coordinates is realized. The system is fixed at a wellhead, does not need to descend, and adapts to scenes such as shallow wells / deep wells and good / weak signal areas; based on a high-density point cloud and an automatic algorithm, the measurement precision is high, the efficiency is improved, and output data can be directly used for pipe network modeling. The method solves the problems of low efficiency, strong manual dependence and poor safety of traditional measurement, and is suitable for parameter measurement of various inspection wells and pipe networks.

The invention provides a well-station-oil depot coupling simulation-based crude oil coagulation risk optimization method, which comprises the following steps of: firstly, designing a well-station-oil depot pipe network system topological structure, analyzing a pipe network structure, and numbering wells, stations, oil depots and pipelines to obtain the numbers of an upstream pipeline and a downstream pipeline of each pipeline; then, a well-station-oil depot pipe network system is disassembled into a node + pipeline form, each pipeline is dispersed into a plurality of calculation units, and the pipe section length, diameter and dip angle of each calculation unit are obtained; according to the fluid temperature of each wellhead, the fluid entering pressure of each station and a PVT physical property table, assuming the temperature and pressure of all nodes to obtain the average temperature and pressure of each pipe section; and calculating crude oil physical property parameters, crude oil flow parameters, pressure drop and temperature drop parameters of each pipe section by adopting an iterative method to obtain pressure and temperature of all nodes, and finally judging the pipe condensation risk according to the physical property parameters and the pipeline pressure and temperature. The pipe condensation risk can be automatically judged, and the production efficiency and safety are improved.

The invention relates to the technical field of wellhead protection, and particularly discloses an oil production wellhead pressure self-adaption protection device which comprises a protection shell, an indicator lamp is installed on the protection shell, the protection shell comprises a shell body, and a main pipeline is arranged on the inner side of the shell body. A partition cavity, a pressurizing groove and a pressure sensing groove are sequentially formed in the outer side of the main pipeline from top to bottom, the partition cavity is a multi-angle deep groove, a partition assembly is installed in the partition cavity, one end of the partition assembly is installed on a hydraulic input pipe, and the hydraulic input pipes are communicated through hydraulic oil communication holes; by arranging the partition assembly, when blowout occurs, a pressure sensor collects pressure information, an electric signal controls a hydraulic assembly to extend, the sharp ends of triangular fault blocks pierce the interior of a pipeline, multi-direction pressure synchronous operation is formed among the four triangular fault blocks, the pipeline is rapidly cut off, and the pipeline cannot transport oil again; and rapid and complete plugging in the pipeline is realized.

The invention provides a method and a device for predicting a steam cavity in steam flooding by using an overlap factor, and belongs to the technical field of oil field oil extraction. The method comprises the following steps: determining an incidence relation between wellhead production characteristics of a first production well and a well bottom average temperature value, and determining a well bottom average temperature value of a second production well according to wellhead production characteristics of the second production well by utilizing the incidence relation; determining overlap factors of different displacement layer sections of the first production well; weighting the well bottom average temperature value of the second production well by using the overlay factor of each displacement layer section, and obtaining the well bottom correction temperature of each displacement layer section in the second production well in a one-to-one correspondence manner; and comparing the well bottom correction temperature of the second production well with the well bottom temperature of the steam injection well in the well group where the second production well is located, comparing the well bottom pressure of the second production well with the well bottom pressure of the steam injection well, and identifying the steam cavity of each displacement layer section of the second production well. By means of the method, rapid, accurate and low-cost recognition of the steam cavity is achieved.

The invention relates to the technical field of oil and gas field and coal bed gas field mining equipment, in particular to a wellhead suspension centrifugal pump drive double-pipe jet flow drainage and mining device and a using method. According to the technical scheme, a lower tubing head four-way joint, a middle tubing head four-way joint and an upper tubing head four-way joint are sequentially installed on a bottom flange, a motor is installed on the upper portion of the upper tubing head four-way joint, and an inner pipe plug-in pump core catcher is installed at the lower end of a submersible water injection centrifugal pump; the lower end of the inner pipe inserted pump core catcher is movably connected with an inner layer oil pipe, and a pump core installed in the double-pipe jet pump is arranged in a pump cylinder of the jet pump. The device has the advantages that due to the fact that a packer is omitted and the device is connected with the double-pipe jet pump, sand-containing liquid in a well can be sucked, and exploitation of natural gas or coal bed gas can be achieved; the inner pipe is inserted into an elastic clamping jaw of the pump core catcher to catch the pump core; and the submersible water injection centrifugal pump and the pump core can be lifted to the ground at one time by hoisting the motor at a ground wellhead, so that the maintenance is convenient.

The invention discloses an intelligent prediction method for a fracturing wellhead yield increase effect, and the method comprises the steps: carrying out the fusion collection, standardization and embedded dimension reduction of multi-source real-time and historical data, environment and geological parameters and expert experience, cooperatively extracting high-dimensional features, evaluating the uncertainty of the features through a Bayesian model, and carrying out the weighted input of a reinforcement learning architecture, thereby achieving the intelligent prediction of the yield increase effect of a fracturing wellhead. According to the method, causal reasoning and deviation correction are carried out in combination with physical and business indexes, high consistency of a strategy and a multi-target business index is realized by dynamically adjusting a reward function, and self-adaptive retraining and robust optimization of a model in extreme environments such as high noise and data missing are realized through field evaluation regression analysis of output. According to the method, the adaptability and prediction accuracy of the fracturing yield increase prediction and optimization system to complex working conditions are remarkably improved.

The angle-adjustable underwater well mouth comprises a high-pressure well mouth, a low-pressure well mouth and a low-pressure well mouth extension sleeve, the high-pressure well mouth and the low-pressure well mouth are positioned and adjusted in direction through a first well mouth spherical pair, and the high-pressure well mouth and the low-pressure well mouth are locked through a locking ring; in the tie-back operation mode, a high-pressure well mouth is connected with a flexible insertion sealing pipe through a high-pressure well mouth thin-wall extension sleeve, a tie-back tail pipe hanger is arranged in a low-pressure well mouth extension sleeve, a guide cylinder is arranged at the upper end of the tie-back tail pipe hanger, and a guide head is arranged at the lower end of the flexible insertion sealing pipe. The flexible insertion sealing pipe can enter the tie-back tail pipe hanger under the guiding action of the guiding head and the guiding cylinder; in the non-tie-back operation mode, the common extension sleeve is connected below the high-pressure wellhead, and the sleeve string is connected below the common extension sleeve. The inclined high-pressure wellhead is adjusted to be approximately vertical as required, so that a service tool, a blowout preventer and a Christmas tree are convenient to mount, the stability of the wellhead is enhanced, and the operation risk is reduced.

A method for performing simultaneous operations at a wellsite comprising two or more adjacent wellheads, each respectively connected to a well, may include the following steps: providing a fluid supply via upstream equipment to an intermediate supply point; fluidly connecting the intermediate supply point to a single wellhead, the fluidly connecting comprising connecting a first end of a flexible pipe to the intermediate supply point and a second end of the flexible pipe to a first wellhead; performing a wellbore operation on a first well using the fluid supply from the upstream equipment supplied to the first wellhead; disconnecting the second end of the flexible pipe from the first wellhead; and connecting the second end of the flexible pipe to a second wellhead.

The application provides a downhole hydraulic back-off tool, characterized in that the back-off tool comprises a hydraulic anchor, a hydraulic back-off device and a telescopic compensation mechanism, and the power part is composed of a driving cylinder, a driving pin, an anti-rotation cylinder, a rotating cylinder, a third spring, a central shaft, an inner ratchet mechanism, a driving shaft and an outer ratchet mechanism; the one-way left-rotation part of the hydraulic back-off device comprises the inner ratchet mechanism and a second spring, and the anti-rebound right-rotation part comprises the outer ratchet mechanism and a first spring. The application makes all the torques of the workover operation be transmitted to the fishing tool through the relative movement of the inner ratchet mechanism and the outer ratchet mechanism from the hydraulic back-off device, and the working string does not need to transmit the torque to the downhole through the surface wellhead rotary table or the top drive, the hydraulic anchor is anchored and unanchored through the pressure in the string, and the anchor provides a fulcrum function for the timely cooperation of the power torque output of the hydraulic back-off device; the telescopic compensation mechanism is used for compensating the axial displacement of the back-off tool.

The invention provides a deepwater semi-submersible drilling platform pressure control drilling MPD control system which comprises a platform rotary table face. A platform wellhead flow divider, a marine riser expansion joint, a marine riser tension ring, a marine riser rotation control pup joint, an MPD hydraulic control pup joint, an MPD marine riser annulus sealing device, a marine riser four-way joint, a drilling marine riser, an underwater blowout preventer set and a seabed underwater wellhead are sequentially connected to the platform rotary table face from top to bottom. The MPD hydraulic control pup joint is connected with a rotary control pup joint power unit through an umbilical cable I, an umbilical cable roller frame I and a cable hose, and the rotary control pup joint power unit is connected with a deepwater MPD electro-hydraulic control system main control station; the MPD marine riser annulus sealing device is connected with the annulus sealing device and the buffer manifold hydraulic power unit through an umbilical cable II, an umbilical cable roller frame II and a cable hose and is connected with the deepwater MPD electro-hydraulic control system master control station; the throttling hydraulic power unit is connected with the deepwater MPD electro-hydraulic control system master control station. According to the system, pressure regulation and control, equipment management and operation safety guarantee in the deepwater pressure-controlled drilling well are realized.

The invention relates to the technical field of oil and gas exploitation equipment, and particularly discloses a durable and stable extra-high pressure wellhead device which comprises a tubing head four-way joint, an oil and gas exploitation tree, a connecting assembly and an auxiliary assembly. A pressure type vibration pipe fitting is arranged in the oil and gas extraction tree, and a vibration monitoring and adjusting system is combined, so that resonance is avoided; the sealing performance is improved by adopting a multi-layer composite sealing structure and a double-layer sealing ring; a reinforced supporting structure and an anti-movement structure are utilized to ensure the stability; and real-time monitoring, early warning and remote control are realized by means of an intelligent monitoring and control system. The ultra-high-pressure well head device effectively solves many problems of an existing well head device in the ultra-high-pressure environment, the stability, the sealing performance and the intelligent degree of the device are greatly improved, the maintenance cost is reduced, the oil and gas exploitation efficiency and safety are improved, and the ultra-high-pressure well head device is suitable for various ultra-high-pressure oil and gas exploitation scenes.

The invention belongs to the technical field of oil and gas drilling equipment, and discloses a mechanical arm for lifting a pipe, which comprises a mechanical arm and a horizontal catwalk, the mechanical arm comprises a lifting mechanism, the lifting mechanism is arranged on the horizontal catwalk, the lifting mechanism is provided with a swing mechanism, the swing mechanism is provided with a luffing mechanism, the luffing mechanism is provided with a telescopic mechanism, and the telescopic mechanism is arranged on the horizontal catwalk. A righting mechanism is arranged in the middle of the telescopic mechanism, clamping mechanisms are arranged at the two ends of the telescopic mechanism, all the clamping mechanisms are used for clamping the upper position and the lower position of a pipe, and the righting mechanism is used for righting the pipe. Synchronous operation of the horizontal catwalk, the mechanical arm and the power head can be achieved, automatic telescopic buckling or releasing of the wellhead coupling can be achieved, and the operation efficiency is improved.

The invention belongs to the technical field of geothermal energy development and utilization, and particularly relates to efficient extraction equipment for a deep geothermal exploitation well, which comprises a plurality of water pumping devices, the plurality of water pumping devices are sequentially communicated in series through a plurality of extension pipe fittings, and the water pumping device close to a wellhead is fixedly connected with a steel wire rope on hoisting equipment; the water pumping device comprises a water pumping mechanism, a well cementation assembly and a guide mechanism, the outer wall of the water pumping mechanism is sleeved with the well cementation assembly, the well cementation assembly is used for making friction contact with the well wall so as to keep the working position of the water pumping mechanism in a well, and the guide mechanism is arranged at the bottom end of the water pumping mechanism and used for guiding the water pumping mechanism to work. And the guide mechanism is used for smoothly lowering the water pumping mechanism into the well and keeping the water pumping mechanism coaxial with the well body. It is guaranteed that the water pumping mechanism is stably fixed in a well, smoothly lowered to the bottom of the well and always coaxially positioned with the well body, and the stability of extraction operation is improved.

The invention discloses an automatic hard well shut-in method and system integrated with a petroleum drilling machine control system, and relates to the technical field of petroleum drilling machine well control. According to the method, the drilling working condition is monitored in real time, an overflow trigger index is calculated, the overflow risk in a shaft is judged, and a hard well shut-in process is started after an alarm is given; the position of a hook and the position of a drill rod joint are monitored in real time, a winch safety stop index is calculated, whether the operation state of the winch is safe or not is judged, the hook is automatically moved to the optimal stop point, and the winch is braked; top drive and slurry pump linkage control is started, a top drive and slurry pump linkage control coefficient is calculated, whether the static working condition before well control is met or not is judged, and equipment is stopped or a strategy is executed accordingly; monitoring the action of the blowout preventer and the state of the hydraulic system, calculating the consistency index of the action of the blowout preventer, judging whether the action of the blowout preventer meets the well shut-in requirement or not, and giving a strategy if the action does not meet the well shut-in requirement; real-time judgment of the overflow risk and automatic hard shut-in of the well can be achieved, the safety of the well mouth is guaranteed, and the risk of manual misoperation is reduced.

The invention relates to the technical field of petroleum drilling and workover treatment, in particular to a petroleum drilling and workover rig pipe tool operation method. The pushing and supporting robot is arranged between the wellhead of the drill floor surface and the power catwalk, and is matched with equipment such as a traveling and hoisting system and an iron roughneck to execute the steps of transferring, screwing, lowering and the like of pipes, so that the single pushing and supporting robot can simultaneously cover the transferring of the pipes from the catwalk to the wellhead and a rat hole and the transferring of the pipes from a racking platform to the wellhead, and a special drill floor pipe racking machine does not need to be additionally arranged; and furthermore, the operation method is suitable for various working conditions, and collaborative operation is simple and convenient.

The invention discloses an underground wireless monitoring system and method, and the system comprises an input device which is used for inputting a detection device into a pipeline for communicating a fracturing pump truck with a fracturing wellhead; the detection device is used for entering a well together with fracturing fluid through an oil pipe or a sleeve channel in the process that the fracturing fluid is pumped into a fracturing wellhead by the fracturing pump truck, collecting underground information representing underground characteristics in the fracturing process in real time and transmitting the collected data to the ground; and the recovery device is used for capturing and recovering the fracturing fluid when the detection device is discharged out of the wellhead along with flowback of the fracturing fluid, and carrying out fracturing process evaluation by analyzing and processing underground information. The problem that in the fracturing process, downhole parameters are difficult to obtain is solved.

The invention discloses electric-drive automatic workover operation equipment for a vertical derrick. The electric-drive automatic workover operation equipment comprises a self-propelled chassis, the vertical self-balancing derrick, a traveling block guide rail, a traveling block, an electric winch, a wellhead automatic platform and a hydraulic pipe conveying machine. The self-propelled chassis is installed at the bottom of the main vehicle and provided with four stepping supporting legs, and a stepping device is arranged below each stepping supporting leg. A balance beam type crown block is mounted at the top end of the upright self-balancing derrick; the traveling block guide rail is arranged along the front side of the upright self-balancing derrick; the traveling block moves up and down along the traveling block guide rail; the wellhead automatic platform is integrated with a hydraulic clamp, a righting manipulator and an automatic hoop finder; the hydraulic pipe conveying machine adopts a horizontal-to-vertical bidirectional lifting mechanism, the vertical self-balancing derrick is configured, a loaded crown block is small in offset, the derrick is configured with a traveling block guide rail, a traveling block moves along with the guide rail and is small in wind load drift, the wellhead pipe column handover processing efficiency is high, and the time for a traveling crane system of the workover rig to participate in pipe column handover is shorter; and the overall efficiency of the automatic tubular column processing operation of the workover rig is improved.

The utility model relates to the technical field of casing centralizers, in particular to an adjustable well cementation casing pipe expanding centralizer which comprises a fixing pipe, a lead screw is rotationally connected into the fixing pipe, a fixing disc is fixedly arranged at the top end of the lead screw, a reset spring is fixedly arranged at the bottom end of the fixing disc, and a rotating ring is fixedly arranged at the bottom end of the reset spring. The device has the advantages that the compression degree of the elastic piece can be adjusted by rotating the lead screw, so that the device can be used for well mouths with different diameters, the application range of the device is widened, the lead screw can be rapidly limited and unlimited, and the device is convenient to use and high in practicability. The screw rod is not easy to rotate when being placed, so that the elastic sheet has higher stability when being placed, the device is not easy to shake when moving in a wellhead, and the centralizing effect of the device on the oil well casing is improved.

The invention provides a pressure control casing head for a gas production wellhead device, and relates to the field of petroleum production, the pressure control casing head comprises a casing head body, a flange plate arranged on the casing head body, a gas outlet formed in the casing head body, and a boss arranged in the casing head body, the protective plug is in threaded connection with the casing head body, and the cleaning mechanism is arranged in the casing head body. The cleaning mechanism comprises a sliding cavity formed in the casing head body, in order to solve the problems that in the prior art, a casing head is tedious in operation and low in working efficiency, through the arranged cleaning mechanism, automatic cleaning of the boss is achieved, and the working efficiency is improved; the cleaning mechanism is arranged, so that the problem that the hanger is loosened or falls off due to external force in the prior art is solved; and through the arranged cleaning mechanism, the problem that in the prior art, the air tightness between the hanger and the casing head body is affected by the air lock phenomenon is solved.

The invention relates to the technical field of oil extraction equipment, in particular to a wellhead Christmas tree sealing device capable of preventing leakage. A flange of a bottom pipe opening of the leakage-proof pipe is connected with a wellhead flange, the top of the leakage-proof pipe is detachably connected with a dust cover, and a penetrating-out opening for a sucker rod to penetrate out is formed in the dust cover. A sealing structure connected to the outer wall of the sucker rod in a sealed mode is fixed into the leakage-proof pipe. A pressure relief structure is arranged on the side portion of the leakage-proof pipe and located below the sealing structure. A cleaning structure used for scraping off oil on the outer wall of the sucker rod is connected to the upper portion of the sealing structure. In the anti-leakage device, the sealing structure in the anti-leakage pipe is tightly connected to the outer wall of the sucker rod, so that oil leakage can be effectively prevented; the pressure relief structure arranged on the side portion of the leakage-proof pipe is located below the sealing structure, when the pressure in the well rises suddenly, the pressure relief piston compresses the control pressure spring under the pressure effect, the pressure relief opening is opened, redundant pressure and petroleum are discharged to the pressure relief storage tank through the oil discharging pipe, and automatic pressure relief is achieved.

The invention discloses an electric heating and heat preservation system and method for a deep-sea gas production seabed wellhead flow channel cold point, which are used for solving the problems of natural gas hydrate generation and paraffin precipitation blockage caused by low temperature and throttling of a deep-sea gas production underwater wellhead and an underwater gas production tree flow channel and ensuring efficient and stable operation of deep-sea gas production operation. An electric heating and heat preservation system for a deep sea gas production seabed wellhead flow channel cold point comprises a cold point positioning system, an electric heating device and a control system. The cold spot positioning system performs real-time data acquisition and preprocessing by constructing a temperature sensor network for key cold spots of an underwater christmas tree runner, quantifies the positions and risk levels of the cold spots in combination with a probability statistical model, and provides an accurate targeted heating basis for the distribution positions of electric heating devices. A heating element of the electric heating device is arranged in a cold point area of an underwater christmas tree flow channel; the control system obtains data measured by the temperature sensors in the cold spot areas in real time, and whether the corresponding heating elements are started or not is determined according to the data.

A method and system for indirectly fracturing one or a series of two or more wellbore intervals wherein (i) one or more sections of the interacting zone of each indirectly fractured wellbore interval will preferably be isolated by positioning isolation devices therein, (ii) each indirectly fractured wellbore interval will preferably be isolated from the wellhead assembly associated with the wellbore interval, and / or (iii) a directly fractured interval and an indirectly fractured interval can be different portions of the same well, such as a horseshoe well, a deviated or horizontal well, or other well.

The invention discloses a hydrothermal type geothermal efficient exploitation and irrigation intelligent operation maintenance system, and the system comprises a data processing module which is used for carrying out the multi-dimensional and multi-physical-field precise digital mapping of a geothermal reservoir to ground equipment, and obtaining the dynamic change process of the geothermal reservoir and the ground equipment under different working conditions; the data processing module comprises a thermal reservoir geologic model, a THMC coupling simulation model and a ground facility system model, the thermal reservoir geologic model is used for representing a three-dimensional space structure and initial physical property parameter distribution of a geothermal reservoir, and the THMC coupling simulation model is constructed based on the geologic model. The ground facility system model simulates fluid flow, heat transfer, rock mechanics and chemical reaction processes and is used for simulating the working state of ground equipment from a wellhead of a production well to a wellhead of a recharge well; and the execution module is used for driving the variable frequency pump to perform stepless speed regulation so as to change the total flow and pressure of the system, and driving the regulating valve to perform opening regulation so as to realize flow distribution and pressure control, thereby forming an intelligent control loop.

The invention relates to the field of gas production devices, aims to solve the problems that a gas lift drainage gas production device is large in stratum back pressure, small in production pressure difference and not easy to produce gas, and provides a stratum low-back-pressure drainage gas production device and a using method thereof.The stratum low-back-pressure drainage gas production device comprises a small oil pipe, a large oil pipe, a lifting device, a sitting hanging short circuit and a one-way valve; an annular flow channel is formed between the large oil pipe and the small oil pipe; the lifting device is arranged in the small oil pipe and provided with a main flow channel in the axial direction of the small oil pipe. The hanging pup joint is arranged on the small oil pipe and located below the lifting device, and the inner space of the hanging pup joint is communicated with the large oil pipe. The one-way valve is arranged below the large oil pipe; an outlet of the one-way valve faces a wellhead. A check valve tubular column structure is adopted, gas serves as power, underground liquid is sucked, and due to the fact that no rod column is arranged, the device is suitable for a vertical well, a directional well, a complex structure well, a horizontal well and the like; after the efficiency of the lifting device is reduced, back flushing of the lifting device is achieved through the sitting and hanging pup joint, and the lifting device is convenient to salvage.

The invention discloses a self-cleaning filter device for a water injection wellhead. The self-cleaning filter device comprises a self-cleaning assembly, a filter cartridge, a water inlet / outlet pipeline and a self-cleaning manifold, a filter chamber and a water outlet chamber which are isolated from each other are arranged in the self-cleaning assembly, the filter cartridge comprises an outer cartridge and a built-in filter element, the outer cartridge is detachably mounted at the upper end of the assembly, the filter element is communicated with a filter element connector, and a spacing area between the outer cartridge and the filter element is communicated with the water outlet chamber; and the self-cleaning manifold is communicated with the water inlet pipeline, the water outlet pipeline and the filter cartridge and is provided with a self-cleaning control valve. Reverse self-cleaning can be achieved through high-pressure water, shutdown is not needed, impurities are removed in cooperation with a sewage discharging structure, and the filtering period is prolonged; the double-cavity isolation design ensures the filtering effect and assists the effluent index to reach the standard; a miniaturized structure is adaptive to a wellhead, ground treatment cost is reduced, equipment can be protected, the service life is prolonged, and economic benefits of oil extraction in an oil field are improved.