3907 results about "Wellhead" patented technology

A wellhead system includes a wellhead housing and a hanger configured to support a casing within the wellhead housing. The hanger includes one or more passages formed through the hanger. The wellhead system also includes a seal assembly configured to move relative to the hanger to selectively enable a flow of fluid across the hanger via the one or more passages. The hanger, the seal assembly, and a lock ring may be run together into the wellhead housing.

The invention relates to the technical field of pressure detection, in particular to an oil well pressure anomaly detection method and system based on deep learning, and the method comprises the following steps: collecting a control signal and pressure data, calculating a slope difference and fluctuation to mark a sudden change point, extracting a multi-dimensional feature group to generate a training sample, and constructing a deep learning model to recognize pressure difference anomaly. The oil well pressure abnormal time period is predicted in real time. According to the method, accurate attribution of abnormal fluctuations in the oil well operation process is achieved by constructing the time sequence corresponding relation between control signals and pressure difference sudden change, the target pertinence of pressure change recognition is improved, a sliding structure extracts multi-dimensional dynamic characteristics, the capacity of capturing wellhead or underground pressure micro-amplitude abnormity is enhanced, and the training sample is combined with a control behavior label, so that the accuracy of the abnormal fluctuations in the oil well operation process is improved. The distinguishing capability of the model to different abnormal forms is optimized, the adaptability under complex working conditions is improved, a real-time prediction mechanism ensures that oil well pressure state recognition has continuity, rapidness and high confidence, and risk early warning and operation guarantee in the oil extraction process are effectively supported.

The invention relates to an abandoned mine methane source detection-monitoring-analysis method and system based on air-ground cooperation, and belongs to the technical field of coal mine safety monitoring. The method comprises the following steps: carrying a high-sensitivity CH4 detection device and a camera by an unmanned aerial vehicle, carrying out aerial inspection according to a route, and carrying out source detection and inspection on methane distribution around the abandoned mine by returning three-dimensional concentration; the method comprises the following steps: deploying holder laser telemetering equipment and meteorological sensors in a wellhead, a fracture dense area and an air flow path, and transmitting monitoring data through LoRa / ZigBee; the method comprises the following steps: fusing air-ground data, constructing a methane concentration gradient field and a diffusion model, and predicting a leakage trend while performing large-range and continuous monitoring in combination with geological and meteorological data; and the system triggers multi-stage early warning and automatically starts emergency response. According to the invention, all-directional and high-precision monitoring of CH4 in the abandoned mine is realized, the leakage source positioning error is less than 5m, the response efficiency is improved, the operation and maintenance cost is reduced, the explosion and environmental pollution risks are effectively prevented and controlled, and the safety management level of the abandoned mine is improved.

The invention relates to the technical field of underground gas production, and discloses a metal sealing gas production wellhead device which comprises a body. A housing; the filtering assembly is used for circularly filtering gas in the wellhead; the self-discharging assembly is used for automatically discharging impurity particles attached to the filtering assembly; the filtering assembly comprises a screening device and an indexing rotating device; and the screening device is used for filtering gas impurities in the well. According to the metal sealing gas production wellhead device, drum-type double-layer filtering can be achieved through the arranged filtering assembly, so that it can be guaranteed that impurity particles in mined gas can be greatly filtered out, and the purity of the extracted gas is guaranteed. And the indexing rotation of the circular filter cartridge can be controlled by utilizing the indexing rotation device, so that the gradually blocked circular filter cartridge can be rotated, and clean filter holes face the underground again, and therefore, circulating automatic anti-blocking screening is carried out, and the operation stability of the gas production wellhead device is ensured.

A water injection regulation system for water injection well has a float limiting device (A) provided at a wellhead configured to release and capture a float; a ground water delivery device (B) having an outlet in communication with the float limiting device (A), and is configured to inject water into well through the float limiting device (A); and a plurality of downhole water distribution devices, each arranged in a target layer and outside a sidewall of a water-injection string, and configured to monitor production data of the target layer. The float is configured to receive a water distribution instruction to regulate water distribution of each downhole water distribution device, enter the water-injection string (11) with water flow, and float upwards to the wellhead after completing data collection. Each downhole water distribution device is configured to exchange the production data with the water distribution instruction carried by the float.

The invention relates to the technical field of mine safety, and discloses a mine extreme weather emergency defense and up-and-down pre-alarm system, which comprises a ground surface monitoring module used for monitoring the water level, rainfall and environment humidity of a mine wellhead and a ground surface low-lying area in real time and generating a dynamic water level pre-alarm signal; the wellhead flood control module comprises an automatic emergency flood control door and is used for receiving the early warning signal of the earth surface monitoring module and automatically closing the flood control door when the water level reaches a warning line so as to prevent surface accumulated water from flowing backwards to the underground; and the underground early warning and evacuation module comprises a sound-light alarm device and a wireless communication system. By adopting the technical scheme of multi-sensor fusion and water level trend prediction, through multi-dimensional real-time monitoring of the wellhead water level, the rainfall intensity and the environment humidity, the pre-closing state of the flood gate is triggered in advance in combination with dynamic data analysis and an intelligent algorithm, and the technical effects of timely responding to rapid rising of the water level and reducing the operation pressure of equipment are achieved.

The invention relates to the technical field of petroleum and natural gas, in particular to a wellhead leakage alarm device, an early warning method and an intelligent wellhead leakage-proof system.The wellhead leakage alarm device comprises a leakage sensor, a reversible battery, a control unit and a storage box, and a sucker rod hole used for installing a sucker rod is formed in the upper end of the storage box. The device is reasonable and compact in structure, when the packing is punctured and leaked on site, produced liquid is sputtered to the sensing surface of the leakage sensor through a gap between a sucker rod and a packing gland, the leakage sensor sends a signal to the control unit, the control unit sends prompt information about the leakage phenomenon, an operator inspects a wellhead according to the prompt information, and the leakage phenomenon is avoided. The device is suitable for well mouth leakage under various working conditions, can meet the requirement for promoting intelligent oil field construction of an oil field, can early warn the risk of oil well mouth leakage in time, reduces the occurrence of well mouth pollution events, realizes unattended operation, provides technical support for green oil field development, and has good popularization and application prospects.

The invention belongs to a monitoring method, and provides a real-time monitoring method for the amount of liquid accumulated in an oil pipe of a natural gas well and a related device aiming at the technical problems that whether accurate prediction is carried out or not cannot be judged and dynamic changes cannot be monitored in real time in two methods for judging the state of the liquid accumulated in the gas well at present. The method comprises the following steps: acquiring instantaneous wellhead oil pressure, instantaneous wellhead temperature, instantaneous gas production rate and instantaneous water production rate of a natural gas wellhead in real time, and then respectively determining a gas well water-gas ratio, natural gas phase real density, natural gas real kinematic viscosity, natural gas phase real flow rate, natural gas phase Reynolds number and non-dimensional liquid accumulation amount in an oil pipe; and obtaining the actual liquid phase content according to the non-dimensional liquid accumulation amount in the oil pipe, the diameter of the oil pipe and the depth of the oil pipe. Production structure parameters such as instantaneous gas production, instantaneous water production, instantaneous wellhead oil pressure, instantaneous wellhead temperature and the like which are easy to obtain on site can be directly utilized to obtain a liquid accumulation amount evolution dynamic curve of the gas well in the continuous production process.

The invention provides a goaf directional drilling grouting reinforcement method which comprises the following steps: S1, determining a goaf treatment engineering grade and a design standard, and delimiting a goaf treatment range according to the engineering grade and the design standard; the method comprises the steps of S1, determining the position, coordinates and spatial arrangement of a drilling target spot, S2, determining the position, coordinates and planar arrangement of a directional well site, wellhead coordinates and planar arrangement of a directional well site, S4, designing a drilling track form and a drilling well bore structure, and S5, designing a drilling track form and a drilling well bore structure, the drilling track form comprising at least one of a straight line-curve form, a straight line-curve-straight line form and a straight line-curve-curve form. And S5, the drilling technology and drilling track control are determined, and drilling and drilling track control are conducted through directional drilling track measurement control equipment, near-bit geosteering equipment and rotary steering drilling equipment. The goaf directional drilling grouting reinforcement method is wide in treatment range, low in treatment cost and low in construction risk.

The invention belongs to the technical field of petroleum machinery, and particularly relates to a combined type polish rod breakage blowout prevention wellhead device which comprises a valve body, a horizontally symmetrical penetrating cavity is formed in the valve body, the two ends of the cavity are blocked and fixed through glands, and a vertically-penetrating annular channel is further formed in the valve body and allows an oil pumping polish rod to pass through. Two gate plates are further symmetrically arranged in the valve body corresponding to the horizontally-symmetrical penetrating cavity, a rib plate is arranged on one side of the cover plate, and a right-angle rubber base is fixedly connected between the gate plates and the rib plate through bolts. The device can be automatically triggered after the oil pumping polish rod is broken and disengaged, a blowout channel is rapidly sealed, oil well back pressure spraying is prevented, environment pollution caused by crude oil spraying is avoided, and the device has the function of guaranteeing sealing between a wellhead device and the oil pumping polish rod during normal production of a rod-pumped well. And the wellhead device can be isolated from the shaft when the packing is maintained and replaced by the oil extraction system of the pumping unit.

A plunger gas lift control method, comprises: acquiring historical production data of a gas well; setting a load factor value, the maximum well shut-in duration, an afterflow production duration and an afterflow adjustment time step length on the basis of the historical production data of the gas well; acquiring, in real time, state parameters in the gas well production; calculating a load factor on the basis of the state parameters in the gas well production; when the load factor reaches the load factor value or a well shut-in duration reaches the maximum well shut-in duration, opening the well; determining the minimum oil pressure value and the maximum oil pressure value during liquid drainage oscillation, wherein the oil pressure is the pressure at an oil pipe at the wellhead of the gas well; determining a liquid drainage amount on the basis of the minimum oil pressure value and the maximum oil pressure value; and when the liquid drainage amount does not fall within a preset range, adjusting the afterflow production duration on the basis of the liquid drainage amount and the afterflow adjustment time step length. Also provided are a computer device and a computer-readable storage medium. The method, the computer and the computer readable storage medium can realize periodic cyclic on / off control and automatic optimization on a plunger gas lift well on the basis of the set load factor value and the liquid drainage amount, thereby achieving efficient liquid drainage and stable operation of the plunger gas lift well.

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 provides a method, medium and system for calculating the extension length of a hydraulic fracturing main fracture, and belongs to the technical field of hydraulic fracturing. The method, medium and system for calculating the extension length of the hydraulic fracturing main fracture comprise the steps that a water hammer wave signal at the position of a well mouth after hydraulic fracturing pump stopping is obtained; performing cepstrum analysis on the water hammer wave signal; the minimum period of the positive pulse extreme point of the complex cepstrum curve is calculated, and the time of the water hammer wave moving from a wellhead to a bridge plug is obtained; calculating the average speed of movement of the water hammer waves in the well; performing linear trend removal processing on the local signal of the water hammer wave; fourier transform is carried out on the local signal after linear trend removal processing, and a water hammer wave local signal frequency spectrum is obtained; extracting a fundamental frequency corresponding to a maximum value point in the water hammer wave local signal spectrum as a response frequency in the main crack; according to the response frequency in the main fracture, the propagation time of the water hammer wave in the main fracture is calculated; and calculating the extension length of the main crack.

A subsea wellbore monitoring system of the present disclosure includes hanger, plug, and monitoring assemblies. The hanger assembly installs on landing in the wellhead, engages the lock profile, and has a hanger seal sealing in the wellhead. The plug assembly is supported in the hanger assembly and has a plug seal to seal in the landing. Ports of the plug assembly communicate with a bore envelope and an annulus envelope. The monitoring assembly has pressure monitors that communicate with the ports and measure pressure measurements related to the envelopes. The hanger and plug seals can be elastomeric and / or metal elements. The hanger and plug seals are preferably expandable or can be energized outward so the seals can pass any shoulders and profiles when installed in the wellbore and can then seal against the internal surfaces.

The invention belongs to the technical field of overflow monitoring and judgment in the petroleum and natural gas drilling process, and discloses an overflow monitoring device and method based on a shaft multiphase flow flowing rule. A simulation switch connected with an overflow simulation device is arranged at the bottom of a simulation shaft, and gas invasion, water invasion and oil invasion can be simulated respectively; electromagnetic flow meters are installed on a wellhead drilling fluid injection manifold and a wellhead drilling fluid return manifold respectively, a liquid level pressure sensor is installed in a mud pit, dynamic change data of the electromagnetic flow meters and the liquid level pressure sensor are monitored and obtained in real time through a monitoring machine and stored, analyzed and processed in real time, and characteristic parameters of different types of overflow are determined. And on the basis, overflow monitoring and judgment are carried out, and theoretical support and guidance are provided for field well control operation. The whole device disclosed by the invention does not monitor underground, does not need expensive hardware equipment, is low in investment and operation and maintenance cost, is not limited by underground complex environmental factors, and can avoid signal transmission power loss and improve the monitoring effect.

The invention relates to a gas well annulus gas leakage monitoring method and system. The method comprises the steps that the casing side pressure of an initial leakage point is determined; determining the gas leakage flow of the leakage point; determining a time step length required for generating a single bubble under the gas leakage flow; sampling by taking the time step length as a time interval, and obtaining a gas column volume and a liquid column volume in the annulus protection liquid in the current time step length; determining a target wellhead oil sleeve annulus pressure; the casing side pressure of the target leakage point is determined; if the casing side pressure of the target leakage point is smaller than the pressure in the pipe column at the leakage point, the gas column volume and the liquid column volume are updated and serve as the gas column volume and the liquid column volume of the next time step respectively; and the casing side pressure of the target leakage point is repeatedly obtained till the casing side pressure of the target leakage point is larger than or equal to the pressure in the pipe column at the leakage point, and it is determined that gas leakage in the gas well annulus is stopped. The problem that the leakage point casing side pressure detection result error is large due to the fact that the migration process of leaked gas in a liquid column section is ignored in the detection process is solved.

The present application relates to the technical field of wellhead devices. Provided is an integrated wellhead device, comprising a casing head body, an elevation flange and a well completion flange, which are sequentially connected from bottom to top, wherein the casing head body has a first inner cavity; a first hanger assembly and a second hanger assembly are respectively connected to upper and lower ends of the first inner cavity in a sealed manner; the elevation flange has a second inner cavity; the well completion flange is provided with a medium output hole; a heat exchange medium injection end is connected to a lower portion of the casing head body, and an exhaust end is connected to an upper end of the casing head body; and the heat exchange medium injection end and the exhaust end are in communication with an annular space. An outflow sealed flow channel for an injected fluid is formed by means of the annular space, an inner pipe, the second inner cavity and the medium output hole, thereby achieving the function of performing both liquid injection and mining in a single well. A heat exchange medium is directly injected, and then directly flows through the outflow sealed flow channel, thereby realizing the outflow of the heat exchange medium. The integrated wellhead device can be specifically and quickly adapted for cyclic heat exchange in abandoned wells or idle geothermal wells, the overall technical solution is convenient to implement, and the transformation and assembly can be rapidly completed.

The invention discloses a wellhead valve capable of taking out impurities in a pipeline for oil exploitation, relates to the field of oil exploitation, and solves the problems that when an existing wellhead valve for oil exploitation is used, the impurities in a filter screen are difficult to be self-cleaned in the process of screening and filtering the impurities in the pipeline, and the service life of equipment is short. Comprising a shell, a filtering mechanism, a cleaning mechanism and a switching mechanism, the side face of the shell communicates with an input pipe and an output pipe, the filtering mechanism comprises a rotating shaft and a filtering plate, multiple sets of screen holes are evenly formed in the filtering plate, and the cleaning mechanism comprises a cleaning rod. Impurities on the two sets of filter plates are synchronously removed through the cleaning rod, when one sides of the filter plates are cleaned through the cleaning rod, the directions of the filter plates are switched through linkage of the switching mechanism, small-particle impurities which are not cleaned in sieve holes are pushed to one side of the output pipe through flowing of petroleum to be discharged, and the self-cleaning function of the filter plates is achieved.

A method of detecting one or more well interference events at a well penetrating a reservoir in a subterranean formation is provided. The method includes: receiving wellhead pressure and flowrates of oil, gas, and water for the well during production; calculating a bottom hole pressure (BHP) of the well based on the wellhead pressure and flowrate of oil, gas, and water; calculating an average reservoir pressure based at least on the BHP; determining a productivity index (PI) for the well for a plurality of time steps based at least on the average reservoir pressure; determining a dataset of PI values and corresponding cumulative fluid production values from the well; analyzing the dataset to determine one or more breakpoints in a relationship between PI and cumulative fluid production representing one or more well interference events; and producing fluids from the reservoir based at least on the one or more breakpoints.

The invention belongs to the field of petroleum and natural gas drilling engineering, and particularly relates to an ocean fine pressure control drilling inspection device and method. A wellhead monitoring device is used for monitoring locking information of a hoop of an annular blowout preventer; the drill floor monitoring device is used for monitoring the coupling information of the drilling tool; the gas cut monitoring device is used for monitoring gas cut information in the well pipe; the pressure monitoring and automatic control system state monitoring device is used for monitoring valve information of the wellhead device; and the remote control center is used for receiving information sent by the wellhead monitoring device, the drill floor monitoring device, the gas cut monitoring device and the pressure monitoring and automatic control system state monitoring device. According to the invention, state monitoring of different processes such as a drill floor surface, a well mouth, a gas cut state, pressure monitoring and an automatic control system is realized, information interaction with a fine pressure control well drilling control center can be realized, whole-process monitoring of an equipment operation process is guaranteed, safety of a fine pressure control well drilling operation process is guaranteed, and labor force is saved.

The invention discloses a method for predicting the shaft sulfur deposition amount of a sulfur-containing gas well, and belongs to the technical field of oil and gas field development. The method comprises the following steps that S1, basic parameters of the sulfur-containing gas well are collected, and the temperature and pressure of any position in a shaft are calculated; s2, establishing a shaft three-dimensional model, dividing well sections, forming a sulfur inlet and a gas inlet at a shaft bottom inlet, and then performing grid division; s3, establishing a numerical simulation control equation; s4, setting initial and boundary conditions, and performing unsteady-state numerical simulation by applying CFD (Computational Fluid Dynamics) software; s5, the amount of solid-phase sulfur generated by each well section is obtained according to the result of the unsteady-state numerical simulation, and the sulfur concentration of the well mouth is obtained through calculation; and S6, detecting the actual value of the sulfur-containing concentration of the wellhead of the sulfur-containing gas well, comparing the actual value with the value obtained in the step S5, and according to a comparison result, repeating the steps S4 to S6 or directly obtaining the sulfur deposition amount of the sulfur-containing gas well. The method can obtain the distribution condition of the sulfur deposition amount in the shaft, and accurately predicts the sulfur deposition amount in the shaft.

To provide a face ahead exploration method capable of carrying out a plurality of face ahead explorations in a series of operations.SOLUTION: In a face ahead exploration method for exploring characteristics of the natural ground ahead of a tunnel face 2, a drilling machine 1 equipped with a communication space leading to a hole bottom 3 drills ahead from the tunnel face 2, and an exploration process ahead of the face is carried out using the communication space (A rock powder sampling process for sampling rock powder drilled at the hole bottom 3, an elastic wave exploration process for analyzing elastic waves emitted by a tip bit 11 of the drilling machine 1, a core sampling process for sampling rock cores, a wellhead pressure measurement process for measuring wellhead pressure from the hole bottom 3, a horizontal load test process in the hole to determine the deformation coefficient of the natural ground, a hole observation process for photographing the inside of the hole, etc.).SELECTED DRAWING: Figure 2

The present application belongs to the field of production safety technology, and specifically provides a wellhead safety protection device, including a guardrail and a first cover plate, wherein the guardrail is a foldable frame structure, and the guardrail is erected around the wellhead; the first cover plate is installed on the side of the guardrail, and the first cover plate is used to cover the wellhead. The wellhead safety protection device provided by the present application not only meets the requirements for the inspection, maintenance and access functions of the lower facilities of the belt conveyor corridor, but also completely solves the potential safety hazards caused by the failure to cover the wellhead cover in time; the present application designs the first cover plate and the guardrail as a linkage device with an integrated structure, which has a compact structure and is easy to retract and fold. When the first cover plate is opened, the guardrail is unfolded at the same time to form a fence around the wellhead, which also plays a role in safety protection; when the guardrail is folded down, the first cover plate can move downward together with it to close and cover the wellhead, which is simple and convenient to operate, thereby improving the convenience of operation.

The invention belongs to the technical field of gas production wellhead devices, and particularly relates to a sulfur-resistant and carbon dioxide-resistant gas injection and production wellhead device which comprises an injection and production four-way assembly, a crossover flange assembly and a desanding assembly. The desanding assembly comprises a first pipe body, a second pipe body, a treatment box, a desanding barrel, one end of the desanding barrel, an inner spiral piece, a spiral groove, an air cylinder and an internally-tangent spiral blade. When the air pressure of the natural gas is reduced, the air cylinder pushes the internally-tangent spiral blade downwards through the bearing, the internally-tangent spiral blade rotates along the spiral groove in the downward pushing process, the path of the natural gas passing through the inner spiral blade is reduced, the centrifugal force of the natural gas is increased along with increase, and gravel in the natural gas can be thrown out of the sand removing barrel. Due to the fact that the pressure of the natural gas is reduced, a vortex-shaped gas column is formed on the shaft portion of the desanding cylinder and begins to diffuse, when the natural gas passes through the internally-tangent spiral blade, the internally-tangent spiral blade can guide the diffused gas column, the diffused gas column is gathered towards the shaft portion of the desanding cylinder again, the stability of the gas column is improved, and the influence of the gas column on gravel is reduced.

The invention relates to the technical field of sensor calibration, in particular to a multi-type sensor calibration detection method and system. The method comprises the following steps: a plurality of high-temperature acceleration sensors to be calibrated, high-temperature directional sensors and high-temperature vibration sensors are integrated and installed in a logging-while-drilling high-temperature environment chamber corresponding to high-temperature, high-pressure and strong-vibration simulation functions, and zero-position output static calibration is carried out; obtaining a multi-type zero drift static calibration sensor; corresponding temperature, pressure and vibration frequency constraint condition ranges from a well mouth to a well bottom are designed through simulation of a well logging-while-drilling high-temperature environment chamber, dynamic simulation calibration and calibration are carried out, and multiple types of dynamic calibration and calibration sensors are generated; a well logging-while-drilling high-temperature environment chamber is used for simulating corresponding downhole instant strong impact interference constraints and temperature shock interference constraints and carrying out sensing detection verification optimization, and multi-type calibration verification optimization sensors are generated. According to the invention, high-precision calibration and detection of the logging-while-drilling high-temperature sensor can be realized.

A natural gas hydrate in-situ drilling and drilling fluid treatment system, comprising an offshore control platform (16), a natural gas hydrate subsea in-situ drilling device, a disassembly and assembly servo system, a drilling fluid feeding system, a wellhead flowback drilling fluid treatment system, a hydrate decomposition gas treatment system, a wellhead flowback drilling fluid tailings treatment system, a buoyancy control system (15), and a main control electric-power communication support system (17) connected to each system and controlling same, wherein the natural gas hydrate subsea in-situ drilling device and the drilling fluid feeding system are separately detachably connected to the wellhead flowback drilling fluid treatment system; and the hydrate decomposition gas treatment system is separately connected to the wellhead flowback drilling fluid treatment system, the natural gas hydrate subsea in-situ drilling device and the drilling fluid feeding system. Using unattended automation technology realizes the operation of the natural gas hydrate in-situ drilling and drilling fluid treatment system, such that the production process is simplified, automation and modularization are achieved, and subsea in-situ drilling can be performed on a large scale, thus greatly reducing the operation costs.

The invention relates to the technical field of oil production engineering, in particular to a wellhead blowout prevention device which comprises a blowout prevention shell, a left valve element, a right valve element and a driving assembly, and a mounting through hole for a polish rod to penetrate through is formed in the upper end of the blowout prevention shell. The structure is reasonable and compact, when the polish rod in the mounting through hole is not in the center, the right valve element moves leftwards, the eccentric polish rod can move into the right sealing groove along the inner wall of the guide groove, the eccentric polish rod can be centralized, then the guide part moves rightwards to make contact with the guide groove in a sealed mode, and therefore the polish rod is prevented from being blocked. And finally, the left sealing groove, the guide part and the right sealing groove are close to one another to form a vertically-through cylindrical sealing hole, the outer side of the polish rod is in sealing contact with the inner wall of the sealing hole, and therefore the effect of closing the mounting through hole is achieved, and the mounting through hole can be timely and rapidly closed through the driving assembly when leakage or steam channeling blowout happens to the polish rod. The safe operation of the wellhead blowout preventer of the oil pumping unit is ensured, and the occurrence of wellhead pollution events is reduced.

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 present disclosure relates to a method for evaluating a temporary plugging effect of fracturing in a low-permeability oil-gas reservoir based on monitoring pressure. The method comprises: calculating a wellbore friction resistance along a way from a wellhead to a target fracturing segment; calculating, based on a wellhead pressure monitored at the wellhead in real time, a wellbore pressure at the target fracturing segment; calculating a fluid pressure at a crack opening of each perforation cluster; calculating a perforation friction resistance coefficient of each perforation cluster; calculating a fracturing fluid instantaneous displacement of each perforation cluster; calculating, based on the fracturing fluid instantaneous displacement of each perforation cluster, a variation coefficient of a fracturing fluid displacement distribution after a fracturing construction is completed; and evaluating the temporary plugging effect of fracturing based on the variation coefficient.

The invention relates to gas / oil well mouth sealing equipment, in particular to an inner inserting pipe type well cementation well mouth sealing device structure which comprises a drill rod radish head, a first annular protrusion I, a second annular protrusion II, a sealing ring, a sealing ring, a sealing ring and an inner inserting pipe sealing ring, the outer cylindrical face of the drill rod radish head is provided with a first annular protrusion I, and the lower end face of the first annular protrusion I is a conical slope b; a second annular bulge II is arranged on the inner wall of the upper section part of the sleeve joint, and the upper end surface of the second annular bulge II is a conical inclined surface c; a central hole is formed in the pressing cap; the drill rod radish head seat is placed in the sleeve joint, the conical inclined surface b is adaptively propped against the conical inclined surface c, and a sealing ring is arranged between the conical inclined surface b and the conical inclined surface c; a pressing cap is arranged on the radish head of the drill rod from top to bottom in a sleeving mode, abuts against the conical slope a and is connected with the sleeve joint in a threaded fit mode; cement paste is injected into a well through the drill rod, and the cement paste directly enters a gap between the stratum well wall and the casing pipe from the lower end of the drill rod, so that well cementation is achieved. The sealing device has the beneficial effects that the sealing effect is excellent, and the situation of sealing failure is not prone to occurring; the structure is simple and cost is low.