97 results about "Well kill" patented technology

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 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.

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 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 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 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.

The present invention relates to the technical field of oil pipes, and discloses an oil pipe for oil and gas well construction, comprising an oil pipe body for drilling and producing underwater oil fields, the oil pipe body comprising a first oil pipe and a second oil pipe installed at both ends of the first oil pipe, wherein a group of the second oil pipes has pressure relief ports on both sides thereof; a conducting unit, the conducting unit comprising an inner sliding sleeve arranged between the two groups of pressure relief ports, and a plurality of pressure plates are arranged above the inner sliding sleeve, and a group of the second oil pipes corresponding to the inner sliding sleeves are provided with a first locking ball and a second locking ball; when a ball is thrown into the oil pipe body, the steel ball enters the inclined port and blocks the inner sliding sleeve, so that the steel ball pushes the inner sliding sleeve to release the blockage of the pressure relief port. The present invention quickly opens the pressure relief channel through the ball throwing and pressurizing operation, thereby avoiding the risk of uncontrolled well kick caused by blockage of the well killing channel, allowing the pipe string to quickly relieve pressure after the packer fails, thereby avoiding wear of the packer and the oil pipe body.

The application discloses a full-well-section deflagration fracturing construction method, which comprises the following steps: drilling a horizontal well and setting a region to be fractured; lowering a screen pipe into the horizontal well and injecting a well killing fluid; pouring a liquid energetic agent into a flexible non-metallic charge barrel, then installing an ignition structure on a charge end of the charge barrel; connecting an end of a coiled tubing to an upper end of the ignition structure, then conveying the charge barrel to a set position in the horizontal well through the coiled tubing, and making the charge barrel cover all the regions to be fractured in the horizontal well; igniting the ignition structure through the coiled tubing, and making the liquid energetic agent in the charge barrel deflagrate, so that high-pressure combustion gas generated by the deflagration breaks the charge barrel and does work on rocks, and the rocks are fractured; after the fracturing is completed, the screen pipe is recovered, and the charge barrel debris is recovered with the screen pipe. The application solves the problems of complicated assembly and high failure rate in the prior art when performing a super-long well section pre-fracturing operation through a high-energy gas fracturing mode.

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 application discloses a method for real-time monitoring of safety risk of a well killing system, the system comprising a wellhead blowout preventer, a casing, a formation at a casing shoe and a liquid-gas separator, the method comprising: obtaining a maximum gas apparent flow rate of the liquid-gas separator and an inner diameter of the liquid-gas separator under current input conditions; determining a maximum actual separated gas flow rate of the liquid-gas separator according to the maximum gas apparent flow rate and the inner diameter; determining a first maximum flow rate of gas in the liquid-gas separator in a discharge pipeline and a second maximum flow rate of liquid in the liquid-gas separator in the discharge pipeline, and determining a maximum actual discharge gas flow rate and a maximum actual discharge liquid flow rate of the liquid-gas separator in combination with the inner diameter; and determining a safety index of the liquid-gas separator according to the maximum actual discharge liquid flow rate, the maximum actual discharge gas flow rate, the maximum actual separated gas flow rate, total hydrocarbon content and flow rate of fluid input to the liquid-gas separator. The application can detect the safety risk index in real time during well killing operation.

The invention relates to the field of petroleum drilling engineering, in particular to an experimental device for simulating the well killing effect of a rescue well under different communication points. According to the technical scheme, a visual transparent outer shaft, an annular inner shaft, an upper plug and a lower plug form a shaft unit, a simulated rescue well, an angle sensor, a universal connector, an angle adjusting mechanism and a steel hoop form a rescue well unit, and an upper liquid outlet pipeline, a liquid storage tank, a stirrer, a screw pump and a kill fluid injection pipeline form a kill fluid injection unit. The air compressor, the pressure reducing valve, the pressure stabilizing valve, the gas flow regulator, the one-way valve and the gas inlet pipeline form a gas injection unit. The device has the beneficial effects that the simulation rescue well is connected through the universal connector and the angle adjusting mechanism, the complex flowing process of gas invasion and pressure back in a shaft can be simulated when the rescue well at different angles is killed, and the gas-liquid flowing rules of the rescue well at different angles, well killing fluid with different viscosities and at different flow speeds can be clearly observed.

The claimed invention relates to the field of safety in the oil and gas industry and can be used for prompt well killing, as well as for extinguishing wells or containers with petroleum products. The technical problem that the claimed solution shall solve involves improving safety when working on oil and gas wells. The technical result of the claimed invention is to enable the operation of an autonomous well killing device with fire-fighting function, initiated manually to kill the well or reacting to a fire at the wellhead using a thermochemical initiator while simultaneously creating pressure in the device body (vessel) to supply killing and fire extinguishing fluid that is sufficient to kill or extinguish the well. At the same time, a special feature of the autonomous well killing device with fire-fighting function is that it can be connected to an existing system of manifold pipes or pressure pipes of protected tanks and wells.

1. Name of the designed product: centrifugal pump (well killing). 2. Use of the designed product: the designed product is used for conveying liquid. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view 1.

The application relates to the technical field of petroleum well manifolds, in particular to an ultrahigh-pressure throttling well killing manifold; the ultrahigh-pressure throttling well killing manifold comprises a well main pipe, an automatic pressure regulator is communicated and arranged on the well main pipe, the automatic pressure regulator is fixed and communicated with a backflow pipeline, the backflow pipeline is communicated and arranged at the tail end of the well main pipe; the upper end of the well main pipe is fixed and communicated with an auxiliary material adding pipeline for adding auxiliary materials; the upper and lower ends of the well main pipe are respectively fixed and communicated with an upper circulating deslagging pipe and a lower circulating deslagging pipe for deslagging; the ultrahigh-pressure throttling well killing manifold has the advantages that the problem that the well mouth pipeline with unstable internal pressure cannot be used is solved by using real-time circulation hedging, and the problem that the unstable well mouth pressure pipeline cannot be adaptively adjusted is solved.

An offshore drilling wellbore pressure control device comprises an automatic control module, a prying type choke manifold, a well killing pump and a supplementary well killing pump, a mud pit and a wellbore are connected through a first communication channel and a second communication channel respectively, the well killing pump and a first pressure sensor are arranged on the first communication channel, the first communication channel is communicated with a drill rod, and the second pressure sensor is arranged on the second communication channel. The drill rod is arranged in the shaft, the second communicating passage is provided with a skid-type throttle manifold and a supplementary kill pump, the skid-type throttle manifold is internally provided with a speed-adjustable throttle valve, and the second communicating passage between the speed-adjustable throttle valve and the wellhead is provided with a gas-liquid flowmeter and a second pressure sensor. The method has the advantages that automatic control over the whole well killing process is achieved, adverse effects caused by manual well killing of field personnel are completely eliminated, and the problems that pressure control is not accurate in the well killing process, and gas overflow well killing difficulty is large are solved. The automatic well killing device can be used on site and can automatically adjust the wellhead pressure, and the response speed and accuracy of well killing operation are improved.

The utility model relates to the technical field of in-well pressure measurement, in particular to a formation pressure measuring pipe column which comprises an oil pipe, a pressure measuring element, a packer and a liquid extractor, the packer is arranged above a formation to seal the annulus between the pressure measuring pipe column and a shaft, the liquid extractor comprises a cylinder body and a piston, the cylinder body is connected with the oil pipe, and the piston is connected with the oil pipe. The piston divides an inner cavity of the pressure measuring pipe column into an upper pipe cavity and a lower pipe cavity, the piston and the cylinder body move relatively to be used for sucking well killing fluid in the lower pipe cavity of the pressure measuring pipe column so that formation fluid can flow into a shaft from a formation, and the pressure of the lower pipe cavity of the pressure measuring pipe column and the pressure of the shaft below the packer are equal to the pressure of the formation. The liquid column pressure of the well killing fluid in the upper pipe cavity and the space above the packer is separated from the pressure of the lower pipe cavity and the space below the packer, the formation pressure can be obtained by measuring the pressure of the lower pipe cavity of the pressure measuring pipe column or the pressure of a shaft below the packer, the influence of the well killing fluid in the shaft is avoided, and the formation pressure measuring accuracy is improved.

The present application belongs to the technical field of petroleum geology development, and discloses a fracturing method based on fluid heterogeneity, which comprises the following steps: preflush gel fracture creation + gel sand-carrying fracture propping + viscosity reducer rapid filtration loss to expand swept volume + fracture propping fracture mouth and near wellbore zone + post-located viscosity reducer + well killing, according to different conditions of repeated fracturing wells, new well perforation fracturing, old well new perforation interval, and unfractured well in thermal production, appropriate adjustment is made, and the fracturing method is used for field test of 20 wells, and the average single well daily liquid increase is increased from 4.0t of the conventional method to 6.2t, and the daily oil increase is increased from 0.3t to 0.5t.

The invention relates to the field of oil and gas drilling well control, and discloses a pressure control drilling overflow well killing simulation system and method, a medium and electronic equipment. The system comprises a data acquisition and control device used for acquiring pressure at a preset position of a shaft simulation device and sending an instruction used for adjusting the opening degree of a throttle valve; the shaft simulation device is used for simulating a shaft environment; the drilling fluid circulating device is used for controlling the drilling fluid to execute circulating operation between the shaft simulation device and the drilling fluid circulating device and controlling the backflow flow of the drilling fluid; the well killing device is used for inputting well killing fluid; the overflow device is used for inputting gas cut fluid; during overflow well killing, the one-way valve serves as a channel for well killing fluid to flow into the annular space of the sleeve so as to increase the density of overflow objects in the annular space and further slow down the rising speed of the gas cut fluid. The relation between overflow parameters and wellhead back pressure in the overflow well killing process can be analyzed according to pressure and flow, and theoretical support can be provided for overflow well killing; and the one-time well killing success rate can be improved.