141 results about "Well kill" patented technology

The invention relates to the field of well killing manifolds, in particular to a throttling well killing manifold capable of moving vertically, which comprises a lifting mechanism used for performing vertical lifting treatment on the well killing manifold; the well killing mechanism is used for controlling and processing the wellhead pressure; the well killing mechanism is fixedly mounted on the lifting mechanism; the well killing mechanism comprises a middle through mechanism, a first throttling mechanism, a liquid injection piece and a second throttling mechanism are fixedly installed on the outer side of the middle through mechanism, the first throttling mechanism and the second throttling mechanism are symmetrically arranged at the two ends of the middle through mechanism, and throttling bars are extruded outwards through downward extrusion of end face plates; wherein the throttling strips are symmetrically connected to the two ends of the throttling disc, the contact faces between the throttling strips and the end face plates are inclined faces, and therefore the throttling strips can stretch out of the throttling disc and are attached to the inner wall of the runner pipe, and the effect of conducting secondary throttling treatment on liquid in a well is achieved.

Disclosed are a device and method for rapidly regulating downhole pressure after a kick in deepwater shallow open-circuit drilling. The device includes a real-time monitoring device and a real-time regulation device. Aiming at deepwater shallow open-circuit drilling characteristics, the present disclosure proposes that a drilling fluid return condition at a seabed is monitored through a subsea remote operated vehicle (ROV); based on this data, whether gas influx occurs in a downhole or not and changes of the gas influx rate and the formation pressure after the gas influx are analyzed in real time, and then real-time guidance is provided for the design of key parameters such as well killing fluid displacement and density, and the well killing fluid displacement and density are regulated in real time, to achieve rapid regulation of the downhole pressure after gas influx of deepwater shallow open-circuit drilling.

The utility model relates to the field of well killing manifold industry, in particular to a lifting adjusting type well killing manifold capable of being rapidly positioned and installed. The technical problems that in the using process of a well killing manifold, rapid positioning is difficult to achieve, and the direction of a pipeline is inconvenient to change rapidly are solved. According to the technical scheme, the lifting adjusting type well killing manifold capable of being rapidly positioned and installed comprises a bearing assembly, a sliding assembly, a lifting assembly, a supporting assembly and a manifold assembly. The supporting assembly is installed in the lifting assembly, installation is carried out by changing different symmetrical holes in the supporting assembly, the installation direction of the supporting assembly can be changed, then the pipeline direction of the manifold assembly can be rapidly changed, rapid hoisting can be achieved through the arrangement of the bearing assembly, and after the bearing assembly is installed in place, the pipeline can be rapidly hoisted. And the horizontal and vertical positions of the supporting assembly are finely adjusted through the sliding assembly and the lifting assembly, so that the pipe orifices of different pipelines on the manifold assembly are quickly positioned, and the problem is solved.

The invention relates to the technical field of well killing manifolds, and discloses a throttling type well killing manifold with a lifting base, the throttling type well killing manifold comprises a well killing manifold body and the lifting base, the lifting base comprises a bottom plate, lifting columns and a lifting plate, the four lifting columns are connected to the four corners of the top end of the bottom plate respectively, lifting blocks are arranged on the lifting columns in a sliding mode, and the lifting plates are arranged on the lifting columns. The lifting plate is connected with the four lifting blocks at the same time, and the well killing manifold body is installed above the lifting plate. And the hovering unit is connected to the lifting block and used for locking the lifting block at any position within the preset range of the lifting column. The hovering unit is arranged on the lifting block, and the lifting block can be locked to any position within the lifting range, so that the lifting base can adjust the kill manifold body to any height, the kill manifold body can be quickly in butt joint with pipelines with different heights, and the kill manifold body is kept stable when being impacted by high-pressure fluid during working.

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 provides an ultrahigh pressure gas well ground throttling depressurization pilot production system, which belongs to the technical field of gas well pilot production, and comprises a gas production tree, a pressure test kill manifold sledge, a cyclone desander sledge, a first-stage oil nozzle manifold sledge, a second-stage electric cage throttling valve, a third-stage electric cage throttling valve, an instrument flange, an isolation flat valve and a wellhead pressure release blowout system, the pressure test well killing manifold sledge achieves pressure test of all high-pressure equipment and has the well killing function in the well emergency situation, the cyclone desander sledge can protect all levels of throttling valves and downstream production equipment against erosion, and the service cycle of the throttling valves and the downstream production equipment is prolonged. The fixed oil nozzle and the electric cage type throttle valve are connected in parallel through the first-stage oil nozzle manifold sledge, a production system can be accurately established, and the first-stage electric cage type throttle valve can be replaced and maintained without closing a well.

The invention belongs to the technical field of oil and gas well drilling, and particularly relates to an experimental device and method for simulating the overflow and leakage co-storage well killing process of a fractured-vuggy stratum. The device comprises a simulation wellbore system, a simulation drilling fluid circulation system, a simulation fracture-vug type stratum structure system, a simulation gas injection system, a data acquisition system and a data processing system. The wellbore simulation system is used for simulating a drill stem and a wellbore in an experiment; the simulated drilling fluid circulating system is connected with the upper part of the shaft system and is used for simulating injection and return of drilling fluid; the simulated fracture-vug type stratum structure system is connected with the lower part of the shaft system and is used for simulating cracks and karst caves in an experiment; the simulated gas injection system is used for injecting gas into the fracture-cavity type stratum structure system; and the data acquisition system and the data processing system are used for acquiring and processing experimental data in the experimental device. The experimental device and method provided by the invention aim at solving the problem that in the prior art, the overflow and leakage coexistence well killing process of a fracture-vug type stratum cannot be comprehensively simulated.

A heater cable is disposed through a wellhead assembly into a production tubing string and is lowered such that it is at least partially immersed within a volume of a well kill fluid. Prior to the immersion, a density of the well kill fluid relative to the produced fluids at the downhole end is such that the volume of well kill fluid prevents the flow of the produced fluids from the subterranean zone into the production tubing string. An electric current is flowed though the heater cable, and the heater cable converts the electric current to heat energy. The heat energy is transferred by conduction to the kill fluid thereby reducing the density of the well kill fluid relative to the produced fluids such that the well kill fluid rises in an uphole direction through the production tubing string.

The invention provides a fracture-vug type gas reservoir overflow and well killing law evaluation device and application, and belongs to the field of petroleum and natural gas exploration. The device comprises a fractured-vuggy formation drilling simulation system, and a high-pressure gas injection system, which is connected with the fractured-vuggy formation drilling simulation system and is used for injecting gas into the fractured-vuggy formation drilling simulation system; the circulating liquid injection system is used for injecting circulating liquid into the fracture-cavity formation drilling simulation system; the cement injection system is used for injecting cement into the fracture-cavity type stratum drilling simulation system; and the measurement recording system is used for recording data. The device is closer to the real parameter change process of the overflow kill well of the fracture-vug type gas reservoir, and has the characteristics of continuous and real simulation, multi-condition coupling, measurable multi-parameter and visible process. Experimental measurement results obtained through the method can provide experimental simulation and data support for overflow type judgment and well killing method selection during fracture-vug type gas reservoir overflow.

The invention discloses an under-pressure well process pipe column with a blowout prevention function and a construction method of the under-pressure well process pipe column. The under-pressure well process pipe column sequentially comprises a screwed plug, a screen pipe, a multifunctional under-pressure ball seat, a blowout prevention tail pipe valve, a first water distributor, a first packer, a second water distributor, a second packer and a third water distributor from bottom to top; normal water injection of the first to third water distributors is ensured; during plugging, the multifunctional under-pressure ball seat is automatically opened, so that no dead cavity is generated at the lower end of the tubular column. During normal well washing, the ball seat is closed, and water is injected into the water distributors normally. During inverse well flushing, the center channel of the ball seat is opened, and it can be guaranteed that setting can be conducted again during normal water injection. When the underground pipe column needs to be lifted, the strong magnetic ball suction pipe is put, and the lower end of the pipe column does not form a dead cavity, so that the strong magnetic ball suction pipe can smoothly move downwards; the bottom reversely seals the lower end opening of the inner sliding sleeve of the blowout prevention tail pipe valve, reliable blocking is achieved, and then underground pipe columns can be pulled out of a well mouth one by one under pressure for maintenance.

The invention provides a blowout control method based on wellhead methane adsorption, which comprises the following steps of: compounding a methane adsorption material with other necessary drilling fluid additives to form high-density composite well killing fluid in a key stage (namely when well control dangerous conditions such as overflow or well kick occur) before blowout; and then, at the position 100-200 m below a well mouth, the composite well killing fluid is injected into a shaft through special well killing fluid injection equipment according to preset injection parameters. According to the method, slipping and rising of methane bubbles invading a shaft are effectively restrained through the high density of well killing fluid, meanwhile, methane gas in the shaft is adsorbed in real time through a methane adsorption material compounded in the well killing fluid, gas column expansion and pressure rising are effectively controlled in the early stage of gas invasion through the dual-action mechanism of density suppression and active adsorption, and the gas invasion safety is effectively improved. Therefore, blowout is prevented or development of blowout is restrained.

The invention provides a vertical well infinite oil pipe fracturing pipe column technology and an implementation method, and belongs to the technical field of oil field well completion fracturing devices. A well killing valve is located at the uppermost end, and a hydraulic anchor and a packer are sequentially arranged below the well killing valve; an infinite-stage fracturing sliding sleeve, a safety release joint and a packer are sequentially arranged between the two target layers; the infinite fracturing sliding sleeves are arranged at all underground target layers; the infinite-order fracturing sliding sleeve comprises an opening tool assembly for controlling opening of the infinite-order fracturing sliding sleeve. The telescopic pipe is arranged between the packer of each target layer and the infinite fracturing sliding sleeve of the next target layer; a setting ball seat is arranged above a target layer closest to an artificial well bottom, and the setting ball seat can provide a pressure building condition during setting. According to the method, the problem that the partial pressure stage number and the fracturing scale of an existing vertical well partial pressure pipe column process technology are limited is solved, meanwhile, the setting and unsetting operation difficulty of the partial pressure pipe column is reduced, the sand burying prevention capacity of the pipe column is achieved, and the safety of the partial pressure pipe column is improved.

The throttling well killing device comprises a height adjusting structure, a position adjusting structure is fixed to the upper side of the height adjusting structure, a throttling well killing structure is detachably installed on the position adjusting structure, a recycling structure is embedded in the position adjusting structure, and an energy-saving structure is detachably installed on the upper side of the position adjusting structure. The height adjusting structure comprises a bottom box, a first height adjusting assembly is embedded in the bottom box, a bottom plate is fixed to the upper side of the first height adjusting assembly, the bottom box limits and fixes the bottom plate through a limiting assembly, the first height adjusting assembly comprises a hydraulic cylinder, and the hydraulic cylinder drives a first shock absorber through a hydraulic rod to telescopically adjust the position of the bottom plate. The throttling and well killing device with the sand prevention structure automatically treats sand and stones, automatically adjusts the height, automatically gives an alarm and recycles oil when oil leaks, automatically protects the throttling and well killing device, and has the advantage of saving energy at the same time.

The invention discloses a remote control offshore unmanned platform positive and negative circulation well washing and killing system and process, the system comprises a water injection manifold, a killing manifold, a closed discharge manifold and a mixed transportation subsea pipeline, and a remote control hydraulic control ball valve group, a first remote control electric oil nozzle, a flowmeter and one or more pressure transmitters are sequentially arranged between the water injection manifold and the killing manifold; the well killing manifold is respectively connected with the well killing pump, the pressure relief pipeline and the Christmas tree service manifold, the pressure relief pipeline is connected with the closed discharge manifold, the Christmas tree service manifold is connected with the mixed transportation subsea pipeline, the pressure relief pipeline is suitable for remote opening and closing pressure relief, and the Christmas tree service manifold is suitable for remote control opening and closing of positive and negative circulation well washing and killing operation. According to the system, positive and reverse circulation well washing and killing, annulus fluid infusion, oil pipe positive extrusion and oil pipe seal examining operation can be remotely and rapidly carried out in a central processing platform (CEP) or an unmanned platform central control room, the technological process is simple, and operation is convenient.

The application discloses a device for replacing a valve of a self-flowing oil well under pressure, which comprises a valve matching connector connected with a valve of a self-flowing oil well to be disassembled, a blowout preventer pipe connected with the other end of the valve matching connector, a setting tool and a setting push cylinder connected in sequence on the blowout preventer pipe from the end close to the valve matching connector to the end far from the valve matching connector, and the other end of the setting push cylinder extending out of the blowout preventer pipe; or the setting tool and an unsetting tool are arranged on the blowout preventer pipe from the end close to the valve matching connector to the end far from the valve matching connector, and the other end of the unsetting tool extends out of the blowout preventer pipe. The device for replacing the valve of the self-flowing oil well under pressure solves the problem of long operation period and large difficulty in replacing the valve of the self-flowing oil well by adopting a pressure relief and well killing mode in the prior art. The application further discloses a method for replacing the valve of the self-flowing oil well under pressure.

The invention relates to the technical field of petroleum and natural gas drilling engineering, in particular to a solid-free well killing fluid and a preparation method thereof, and the solid-free well killing fluid comprises the following raw materials in parts by weight: 80-100 parts of a base fluid, 25-35 parts of a composite additive, 8-12 parts of a soluble thickener, 6-10 parts of a liquid-phase anti-collapse agent and 3-5 parts of a lubricating aid. According to the high-density well killing fluid, a high-density system is constructed through the additive solution A of the composite additive, the specific gravity upper limit of a traditional salt weighting agent is broken through, the hydrotropy stabilizing effect of triethanolamine is combined, salting-out of high-concentration components is avoided, and the problem that specific gravity increase of traditional solid-free well killing fluid is limited is effectively solved; the system viscosity is increased, a liquid rubber plug can be formed, exchange dilution of the well killing fluid and residual sewage in a shaft is effectively blocked, performance degradation caused by dilution of the well killing fluid is avoided, and material waste caused by supplementing of the well killing fluid is also reduced.

The invention relates to a pressure conversion device, in particular to a self-liquid-filling ball injection pressure conversion device for perforation, a perforation device and a perforation process, and aims to ensure communication between a pipe column and an annulus in a well before perforation on the premise of not increasing construction procedures. In order to solve the problems of how to realize circulating well killing to stop blowout and how to prevent perforation liquid from being scattered to the ground of a well mouth to cause pollution during recovery if problems occur in the well before perforation, the self-liquid-filling ball-throwing pressure conversion device for perforation establishes a passage for communicating the inside and the outside of a shell through a conical hole and a communicating hole; when the well is tripped into the well, the passage ensures the communication with the annulus in the well, and if problems occur in the well, circulating well killing can be realized through the passage; and during pressure detonation, the annulus in the well can be isolated through matching of the plugging ball and the conical hole, pressure is transmitted to the pressure tapping exploder through the pressure transmitting hole to complete detonation, and the through hole in the pressure tapping exploder is communicated with the annulus in the well after detonation.

The invention discloses a shaft pressure experiment testing system and method in the well killing process under complex working conditions. The shaft pressure experiment testing system comprises a target high-pressure stratum simulation device, a shaft, a drill string, a blowout preventer, a drilling fluid storage pool, a well killing fluid storage pool, a slurry preparing pool, a slurry pump, a high-pressure gas storage tank, a drilling tool lifting device, a first tee joint, a water hose, a data receiving terminal and a drill bit. The shaft is respectively communicated with the blowout preventer and the target high-pressure stratum simulation device; the left end of the first tee joint is communicated with the slurry pump through a pipeline, the right end of the first tee joint is communicated with the first electric valve through a pipeline, and the upper end of the first tee joint is communicated with the top end of the drill column through a water hose. The top end of the drill column is connected with the drilling tool lifting device; and the high-pressure gas storage tank is communicated with the target high-pressure stratum simulation device through a pipeline. According to the invention, multiple working conditions can be combined, well killing modes under different complex working conditions can be simulated, and the wellbore pressure in the well killing process can be predicted.

The application provides a control method and system of a throttling well killing manifold, the throttling well killing manifold is connected with a wellhead device, and comprises a rapid blowout channel and a common blowout channel which are arranged in parallel, and a throttle valve is installed on the common blowout channel; the control method comprises the following steps: real-time monitoring of wellhead casing pressure P a and standpipe pressure P1, and determining the pressure difference between the wellhead casing pressure and the standpipe pressure; when P a -P l <P z , the drilling operation is normal, and the throttling well killing manifold is not opened; when P z ≤P a -P1<aP z , the throttling well killing manifold is opened, and the opening degree of the throttle valve is dynamically adjusted according to a throttle valve opening degree processing model; when P a -P1≥aP z , or there is no drilling fluid to be recovered in the separator and the well is full of gas, the rapid blowout channel is opened, and blowout operation is implemented. In the process of implementing the blowout operation, the application adopts multi-channel control, and ensures the timeliness and safety of the blowout.

This invention belongs to the field of overflow events, specifically relating to a hierarchical multi-joint learning-based method, system, and equipment for predicting well control overflow events. It aims to address the problems of equipment damage, production interruption, safety accidents, and environmental pollution caused by overflow event risks. The invention includes: training multiple well control overflow event prediction base models based on the training set; obtaining prediction results based on the test set; calculating the accuracy of the base models and selecting retained models to obtain a final feature set; integrating the retained models based on the final feature set to construct a voting-based ensemble model; and inputting the data to be predicted into the ensemble model to obtain the well control overflow event prediction result. This invention improves prediction accuracy and robustness by constructing an ensemble model, optimizes resource utilization, enhances operational safety and decision-making efficiency, effectively prevents well control overflow events, and ensures the safety and economic benefits of oilfield operations.

The embodiment of the invention provides a real-time generation method and device for a well killing decision, equipment, a medium and a product. According to the method, real-time observation data of the flow state of a shaft is obtained. And obtaining prediction state parameters based on the shaft hydraulic model and the real-time observation data. And correcting and fusing the real-time observation data and the predicted state parameters to generate a shaft state estimation result. And determining a well killing control strategy based on the shaft state estimation result and a preset safety constraint condition. According to the method, the problems that in the prior art, shaft state sensing is insufficient, decision response is lagged, and the safety risk control capability is weak are solved, and the intelligent level and safety of well killing operation are remarkably improved.

The present application belongs to the technical field of manifold, and particularly relates to an intelligent throttling well killing manifold, which comprises a base, a plurality of movable support assemblies are slidably connected to the base, the movable support assemblies are fixedly connected with a cross piece, the cross piece is fixedly connected with a plurality of valve body assemblies, adjacent two valve body assemblies are fixed through quick dismounting and mounting assemblies, the quick dismounting and mounting assemblies are fixed on the movable support assemblies, the cross piece and the quick dismounting and mounting assemblies are fixed on different movable support assemblies, the position of the cross piece and the plurality of valve body assemblies can be changed by changing the position of the movable support assemblies on the base, thereby the butt joint installation of the oil well pipeline at different positions can be adapted, the quick dismounting and mounting between adjacent two valve body assemblies can be realized through the quick dismounting and mounting assemblies, the quick maintenance and replacement of the valve body assemblies can be realized, the maintenance efficiency of the throttling well killing manifold is improved, the throttling well killing manifold can be quickly put into use, and thereby the downtime is reduced.

The present invention provides an oil testing method and an oil testing string. The oil testing method includes the following steps: placing a perforating gun into a sleeve and perforating multiple predetermined oil testing layers; removing the perforating gun and placing the oil testing string into the sleeve, aligning multiple electrically controlled test tubes of the oil testing string with the multiple oil testing layers; separating and sealing the multiple oil testing layers with the oil testing string; testing the multiple oil testing layers with the oil testing string; performing reverse circulation well killing on the oil testing string; and removing the oil testing string. The present invention solves the problems of multiple steps and high risks associated with existing oil testing processes.

The invention discloses a determination method and device of a sealed wellbore management and control strategy, a storage medium, an electronic device and a computer program product, and relates to the field of sealed wellbore management and control, and the determination method of the sealed wellbore management and control strategy comprises the steps of monitoring operation data of a target wellbore, the operation data at least comprise the well killing fluid return condition of a diversion trench outlet of the target shaft and in-shaft pressure change data of the target shaft; according to the operation data, determining the risk level of abnormity of the target shaft; and according to the risk level, determining a sealed wellbore management and control strategy of the target wellbore. By the adoption of the technical scheme, the problem that the manual management and control efficiency of the sealed wellbore is low is solved.

The invention discloses an annular gas-liquid two-phase initial condition calculation method, device, equipment and medium for transient well killing simulation, and the method comprises the steps: collecting well mouth parameters in real time after overflow is detected and well shut-in operation is completed; calculating a formation pressure value and an initial trial calculation height according to the wellhead parameters; according to the formation pressure and the volume of the mixed-phase section, the total mole number of gas contained in the mixed-phase section is determined; calculating from the bottom end of a mixed-phase section, namely a shaft bottom position, setting initial pressure and temperature parameters, and solving the temperature and the pressure of a calculation point and the gas phase volume and the mixed-phase density in the height of each section based on the total mole number of gas and the initial trial calculation height; and comparing the calculated top end pressure of the mixed-phase section with the sum of the actually measured shut-in casing pressure and the upper hydrostatic column pressure, if preset conditions are met, outputting the calculated temperature, pressure, gas phase volume and mixed-phase density, and if the preset conditions are not met, performing calculation again. Therefore, the calculation precision of the initial condition under the gas cut working condition is remarkably improved.

The invention relates to the technical field of oilfield chemistry, in particular to a paraffin removal viscosity reducer for hydraulic jet paraffin removal and a use method thereof, the paraffin removal viscosity reducer for hydraulic jet paraffin removal comprises the following raw materials in percentage by mass: 0.1-0.5% of octadecanol, 5-10% of eicosyl heavy mahogany petroleum sulfonate, 5-20% of ethanol, 1-5% of polyethylene oxide surfactant, 10-20% of betaine surfactant, 0.1-0.2% of hydroxyethyl cellulose and the balance of water. And the paraffin removal viscosity reducer is used for adding a required amount of the paraffin removal viscosity reducer into a working medium to obtain a paraffin removal working solution, the paraffin removal working solution is injected into the light casing oil well in a 10-13MPa hydraulic jet fluid form, and the paraffin deposits on the casing wall of the light casing oil well are cleaned by using the hydraulic jet fluid. The paraffin removal and viscosity reduction agent disclosed by the invention is simple in preparation method, can achieve a synergistic effect with a hydraulic jet fluid technology, and can maintain efficient paraffin removal and viscosity reduction performance in a high-salinity and high-specific-gravity slurry or solid-free well killing fluid environment.

The invention relates to an experimental method for simulating the well killing effect of a rescue well under different communication points. Comprising the following steps that (1) a communication point adjusting device is installed on the upper portion of a visual shaft, the bottom of the visual shaft is connected with a gas injection system through a pipeline, the outer end of the communication point adjusting device is connected with a liquid injection system through a pipeline, and the top of the visual shaft is connected with a gas-liquid separator and an outlet flow measuring instrument through pipelines; (5) experimental measurement: recording the injection angle of the injection pipe at the communication point after the liquid phase injection flow is stable, and (6) replacing the injection pipe at the communication point so as to realize the adjustment of the injection angle of the kill fluid, and repeating the steps (2)-(5). The well killing simulation device has the advantages that well killing process simulation of the rescue well at different communication points can be achieved, the multiphase flow law in the well killing cylinder is revealed, and therefore the well killing effect of the rescue well under different working conditions is researched, and well killing parameters of the rescue well are optimized.

The invention discloses an emergency disposal method and a related device for cable broken wire clamping. The method comprises the following steps: closing and locking a flashboard of a cable blowout preventer; a sealing medium is injected into the locked flashboard, and a wellhead is sealed; releasing the pressure of the cable blowout preventer on the sealed wellhead, and detaching a blowout prevention pipe; and maintaining the cable in the detached blowout prevention pipe. Compared with a traditional well killing treatment method, the method has the advantages that the operation steps are simplified, the cost input is reduced, the treatment time efficiency is improved, leakage of drilling fluid or other harmful substances can be prevented, workers are protected against injuries, and meanwhile the environment is protected.

The invention discloses a pressure-controlled underground temporary closing valve and a using method thereof. The pressure-controlled underground temporary closing valve comprises a fixed sealing part and a constant pressure valve part, and the upper end of the constant pressure valve part is connected with the lower end of the fixed sealing part; the constant pressure valve part comprises a constant pressure valve body and a constant pressure valve core; a downward valve seat is arranged in the constant-pressure valve body, and the constant-pressure valve element is arranged in the valve seat and cannot move upwards. The operation principle is simple in field actual use, temporary plugging of a production layer is reliable, non-well-killing shaft operation and rapid production recovery can be achieved, the operation safety coefficient is increased, well killing, drilling and sweeping procedures and pollution of slurry plugging slurry to the production layer are reduced, the slurry and well repairing cost is reduced, and the operation time efficiency is improved.

The utility model discloses a well fluid collecting device of a well logging standard well, which comprises an annular mounting cover connected to the end part of the well logging standard well, one side of the annular mounting cover is connected with a liquid density sensor and a U-shaped transmission pipe, and the U-shaped transmission pipe is connected with a first control valve and a cyclone hydraulic separator used for separating liquids with different densities. The high-density liquid output end of the cyclone hydraulic separator is connected with a well killing fluid transfer box through a first pipeline, the low-density liquid output end of the cyclone hydraulic separator is connected with a shaft outlet liquid collecting box through a second pipeline, the well killing fluid transfer box is provided with a power pump which is connected with an output pipe, the output pipe is connected with an extension pipe, and the first pipeline is connected with a second control valve. The extension pipe is connected with a third control valve.