37 results about "Well control" patented technology

The present application relates to a kind of determination methods of fracturing horizontal well controlled reserves, belong to oil and gas reservoir exploration and development technical field.The determination method of fracturing horizontal well controlled reserves of the present application, comprising the following steps: based on the length of horizontal section of fracturing horizontal well, the angle between horizontal section and maximum horizontal principal stress, limit drainage radius and the half fracture length of fracturing fracture, the area of the region surrounded by the maximum envelope line of fracturing horizontal well seepage field is calculated, and the control area of fracturing horizontal well is obtained;Based on the product of fracturing horizontal well control area, oil layer effective thickness and single storage coefficient, the control reserves of fracturing horizontal well is determined.The determination method of fracturing horizontal well controlled reserves of the present application simplifies single well control area into the maximum drainage area of single well that can control oil layer fluid seepage from the seepage angle, which can effectively simplify the calculation process and improve the calculation efficiency.

The present application belongs to the technical field of ocean engineering equipment, and particularly relates to a kind of integrity design method of ocean oil and gas development well control equipment mechanical system. The integrity design method realizes the guarantee of the whole life cycle working reliability of the ocean oil and gas development well control equipment by constructing the integrity index factor of the ocean oil and gas development well control equipment mechanical system integrating multi-source information, and balances the working reliability of each component in the whole life cycle. The integrity design method of the ocean oil and gas development well control equipment mechanical system comprises the following steps: obtaining the performance parameters of the key components of the ocean oil and gas development well control equipment mechanical system; calculating the performance parameters of the overall structure of the ocean oil and gas development well control equipment mechanical system; determining the working condition environmental parameters of the ocean oil and gas development well control equipment; calculating the time-varying reliability of the ocean oil and gas development well control equipment mechanical system; constructing the integrity index factor of the ocean oil and gas development well control equipment mechanical system; and completing the integrity optimization design.

This application discloses an integrated gas invasion control method that combines inhibition and absorption, applied to wellbores experiencing gas invasion. The method includes the following steps: constructing a composite slurry column system in the wellbore, comprising, from bottom to top, a gas-intake slug and a gas-enhancing slug; the gas-intake slug converts free gas into a solid-phase adsorbed state or a liquid-phase dissolved state by adding gas-intake material to the drilling fluid, thereby reducing the gas volume in situ within the wellbore; the gas-enhancing slug triggers viscosity enhancement when residual gas enters by adding a gas-responsive material to the drilling fluid, increasing fluid resistance and mitigating gas slippage. This application achieves a synergistic gas control effect through a segmented composite slurry column system, first reducing gas volume through absorption and then increasing viscosity and reducing gas flow rate, enabling early proactive intervention in gas invasion, avoiding fluid instability and gas channeling risks, and improving well control success rate.

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 present application relates to a kind of well gas invasion and loss parameter inversion methods based on unscented Kalman filter, belong to petroleum engineering technical field, comprising: step 1: establish overflow wellbore multiphase flow model;Step 2: establish inversion model;Step 3: solve inversion model;Calculate the inversion result of downhole gas invasion and loss parameter.The application method combines wellbore multiphase flow equation with state space model, uses the nonlinear estimation characteristics of UKF algorithm, carries out dynamic filtering and state updating to wellhead measurable data, realizes the real-time inversion of downhole gas volume fraction, gas invasion flow and loss amount.UKF method can accurately capture the nonlinear characteristics of system without linearization, thereby improving the inversion accuracy and calculation stability under complex conditions.Through example verification, this method has good applicability under single reservoir, multiple reservoir and overflow and leakage coexistence conditions, provides reliable boundary conditions and intelligent control basis for well control system.

This invention relates to the field of collaborative well testing technology for coal reservoirs, specifically disclosing a constant flow rate-limited pressure collaborative control method and system for coal reservoir well testing. The method includes: collecting cluster-single-well dual-dimensional parameters; constructing a regional reservoir pressure field coupling model based on the dual-dimensional parameters, wherein the regional reservoir pressure field coupling model embeds fluid-structure interaction equations and a pulverized coal critical velocity model; configuring a cluster-single-well dual-level priority dynamic allocation rule based on the dual-dimensional parameters; and configuring a cluster-level multi-objective optimization algorithm with single-well flow deviation, single-well pressure, regional pressure field uniformity, and cluster pulverized coal blockage risk as constraint indicators. This invention successfully resolves the contradiction between rapid pressure relief and prevention of pulverized coal explosions, minimizing reservoir damage and wellbore blockage risks while ensuring well control safety, and significantly improving the success rate and data quality of coalbed methane well cluster testing operations.

This invention relates to the field of oilfield well workover, and discloses an automatic well sealing switch device and well workover operation equipment. The automatic well sealing switch device includes a height adjustment mechanism, a rotation mechanism, a telescopic mechanism, and an automatic switching mechanism; the height adjustment mechanism includes an adjustment cylinder, an adjustment cylinder, and a support rod; the rotation mechanism is connected to the upper end of the adjustment cylinder; the telescopic mechanism is arranged laterally; the automatic switching mechanism includes a fixed outer sleeve, a lifting cylinder, a lifting outer sleeve, an outer cylinder, an outer cylinder end cap, a well sealing end cap, a guide rod, a suspension blowout preventer short connector, a variable-strut short connector, a lower section short connector, an upper spring sealing sleeve, an upper spring, a bearing, a short connector connecting sleeve, and a lower spring. This invention replaces the traditional rotary valve with an automatic well sealing switch device, achieving rapid well control and emergency blowout control in automated operations, ensuring operational safety; through the reasonable layout and coordinated actions of each mechanism, efficient automatic well sealing is achieved, saving manpower and time.

The application discloses a single-well control module integrated with multiple valve groups, which is applied to a wellhead safety control system of an oil and gas well. The single-well control module has 1 / 2 level control of an emergency shutdown system, 3 level control of the emergency shutdown system, ground wing valve B shutdown control and ground wing valve A shutdown control, can realize four-valve control of a downhole safety valve, a ground main valve, the ground wing valve B and the ground wing valve A, and realizes opening / closing well sequence requirements and remote well shutdown operation through a distributed control system. The single-well control module uses multiple highly integrated valve groups for pipeline connection, can greatly reduce the length of the pipeline and the number of joints, effectively reduces the number of leakage points, enables maintenance personnel to quickly locate abnormal positions, improves the sealing property, reliability and maintenance convenience of system pipeline connection, and realizes integration and standardization of the single-well control module.

The application discloses a kind of intelligent injection well control systems and methods with anti-backout function, it is related to oilfield water injection development technical field, the application includes: data acquisition module, data analysis module, data processing module and local database, through wired pressure transmitter accurate collection injection well dry pressure, oil pressure data, constructs pressure monitoring data set by data correlation, realizes the quick determination and automatic protection of backout risk by pressure value comparison, and continuously monitors pressure change, by difference calculation and analysis backout risk removal condition and restore normal injection, whole system relies on remote terminal unit RTU and realizes integrated intelligent control, pressure monitoring hardware type, range and preset recovery threshold value etc. can be flexibly configured as needed, can accurately prevent and control backout risk, protect pipe network and precision instrument, adapt to various injection well field conditions, improve the intelligentization, stability and operation efficiency of oilfield water injection development.

The present invention relates to the field of geological exploration, and provides a quantitative prediction method and a quantitative prediction system for dolomite. The method comprises: performing diagenetic mechanism identification on dolomite on the basis of multidisciplinary data analysis to determine a target region where the dolomite is present; performing multiscale characterization on a fault system in the target region to determine a multiscale fracture development plane of a target interval; establishing a one-dimensional dolomite quantitative model on a single-well control point on the basis of a multimineral model and a plurality of well logging curves, and determining a dolomite content curve of the single-well control point; and establishing a three-dimensional quantitative model of the dolomite on the basis of the one-dimensional dolomite quantitative model of a plurality of single-well control points and the multiscale fracture development plane of the target interval to perform quantitative prediction on the dolomite. In the present invention, the development characteristics and a distribution range of dolomite in a fault and a fracture development zone can be identified, and the content of the dolomite can be quantitatively analyzed, providing data support for subsequent prediction of heterogeneous reservoirs and high-permeability strips.

The application discloses a single-well control module of an offshore platform with a remote production recovery function. When a remote well is closed, a second electromagnetic valve is first controlled to be closed, hydraulic oil on a third pilot oil supply main line flows into an oil tank of a main system through a pilot pressure oil return branch, an actuator of a wing safety valve loses hydraulic control pressure, and thus the wing safety valve is closed. Then, a first electromagnetic valve is controlled to be closed, hydraulic oil on a second pilot oil supply main line flows into the oil tank of the main system through the pilot pressure oil return branch, an actuator of a main safety valve loses the hydraulic control pressure, and thus the main safety valve is closed. In this way, a Christmas tree of a wellhead is closed. When the Christmas tree of the wellhead needs to be remotely opened, the first electromagnetic valve and the second electromagnetic valve are controlled to be opened in sequence, the main safety valve and the wing safety valve are opened in sequence, and thus the Christmas tree is remotely opened. Therefore, the single-well control module can remotely close and open the Christmas tree of the wellhead, the continuity of production is improved, and manual field operation is avoided.

This invention discloses a quick-change ultra-high pressure throttling and kill manifold, comprising three planar channels arranged in the same plane: a first channel, comprising a first gate valve, a first multi-port, and a second gate valve connected in sequence; a second channel, comprising a third gate valve, a first throttling valve, a first buffer pipe, a second multi-port, a fourth gate valve, a second throttling valve, and a second buffer pipe connected in sequence; and a third channel, comprising a fifth gate valve, a third throttling valve, a third buffer pipe, a third multi-port, a sixth gate valve, a fourth throttling valve, and a fourth buffer pipe connected in sequence; the second and third channels are respectively located on opposite sides of the first channel; the first, third, and fifth gate valves are all connected to the inlet multi-port, and the second gate valve, the second buffer pipe, and the fourth buffer pipe are all connected to the outlet multi-port; the outlet multi-port is also connected to a seventh gate valve. This invention solves the problem of well pressure runaway caused by untimely switching of manifolds or replacement of valves.

This invention discloses a method, apparatus, equipment, and storage medium for analyzing blowout risks in ultra-deep land wells. Applied to the field of well control risk analysis, it determines the probability distribution of the duration of each well control operation sub-process based on a well control operation process model of the well control emergency response process in ultra-deep land wells. Based on the probability distribution of the duration of each well control operation sub-process, it determines the probability distribution of the duration of the overall well control process. Multiphase flow transient simulation is performed to obtain the casing pressure change law after a blowout occurs, and based on the casing pressure change law, the predicted casing pressure for the duration of the overall well control process is determined. Risk analysis is then performed based on the predicted casing pressure and probability distribution of the duration of the overall well control process to obtain the blowout risk analysis results. By determining the time probability distribution of each operation process through the well control model and determining the casing pressure at the time of well shut-in through multiphase flow transient simulation, real-time risk analysis is conducted to quickly grasp the on-site risk status and adjust well control measures in a timely manner, thereby reducing operational risks.

This invention provides an adsorption-based pressure-back blowout control method. Intervention is initiated at the initial signs of well control anomalies (such as precursors to a blowout). A high-density composite kill fluid is prepared by compounding a methane adsorbent with conventional drilling fluid additives. This fluid is then injected into the wellbore in stages at predetermined flow rates and pressure parameters at a depth of 100–200 m below the wellhead using a specialized device. This method reduces slippage velocity and gas volume fraction by adsorbing air bubbles within the wellbore, achieving a synergistic effect of static pressure constraint and active adsorption. This allows for the smoothing of back pressure fluctuations, limiting gas column expansion and pressure rise in the early stages of gas intrusion, reducing the risk of pressure leakage and secondary eruptions, thereby preventing or containing blowouts. This method is suitable for complex conditions such as fractured formations, deep water, high temperature and pressure, and narrow density windows.

The embodiment of the application discloses a kind of optimization method, device and equipment of drilling engineering design, belong to oil and gas safety drilling engineering field.The method is by calculating the overflow risk contribution value of design well, injection-production relationship risk contribution value, injection well casing pressure risk contribution value, injection well position risk contribution value and well leakage risk contribution value, the influence of five factors, such as water invasion overflow, injection-production relationship, injection well casing pressure, injection well position and well leakage, on the well control risk of design well is quantified, the total well control risk contribution value determined based on the five risk contribution values, accurately assess the probability of well control risk of design well, and then suitable wellbore structure and cementing process can be recommended for design well, to optimize the drilling engineering design of design well, to ensure the safety of drilling construction of design well.

This invention discloses a multi-stage circulating filtration and purification system for well control fluid, relating to the field of water treatment technology. It aims to solve the technical problem of insufficient effectiveness of single-method filtration in reusing well control fluids collected under different conditions. The system includes a control pump located at the output end of an initial filtration treatment tank; a primary filtration mechanism is installed at the output end of the control pump; and a secondary filtration mechanism is connected to one of the output ends of the primary filtration mechanism via a control valve. Based on the primary and secondary filtration mechanisms, this invention creates a graded filtration system for well control fluid, achieving targeted operation by performing primary filtration, secondary fine filtration, and tertiary ultrafiltration on well control fluids used in different oil wells. This results in well control fluids filtered by the multi-stage circulating filtration and purification system having adaptability characteristics, meeting the operational needs of different oil wells.

The application discloses a quick well killing method without drill bit at well bottom, and relates to the technical field of well control of oil drilling. First, basic data is collected, initial state calculation of well killing is carried out according to the collected basic data, then suitable well killing fluid density is designed according to the initial state, casing pressure is adjusted so that the well killing fluid is divided at the drill bit, well killing parameters are designed through the well state, well killing progress is judged through the standpipe pressure and the casing pressure, and well killing is finished after the contaminated drilling fluid is completely discharged through circulation of the well killing fluid. The application proposes the quick well killing method without drill bit at well bottom, which has certain guiding significance for well killing in the case that the drill bit is not at the well bottom.

A system includes a drilling fluid flow path configured to be selectively utilized with a well control drilling technique during a first drilling operation and a managed pressure drilling (MPD) techni

The present application belongs to the technical field of oil and gas reservoir reconstruction, and relates to a multifunctional packer for pressure drag fracturing and a construction method thereof. The multifunctional packer for pressure drag fracturing comprises, from top to bottom, an upper joint, a hydraulic lance, a releasing mechanism, a connecting structure, a pressure balancing mechanism, a reverse anchoring mechanism, a sealing unit and a lower joint, wherein the outer wall of the sealing unit is sleeved with a forward anchoring mechanism. In the process of well killing after pressure drag fracturing, the multifunctional packer is released and the well killing sealing function is started, the formation pressure is blocked by the packer for well killing, the wellhead zero-pressure tripping is realized, the wellhead testing equipment is removed, the problem of pressure stagnation of the testing equipment under pressure is effectively solved, the wellhead zero-pressure tripping effectively reduces the well control safety risk, the operation is convenient, and it is conducive to the large-scale popularization and application of the conventional tubing transmission pressure drag fracturing construction process.

This invention discloses a control system and method for a large rectangular pipe jacking shaft in water-rich soft soil strata, relating to the field of foundation pit construction technology. The system includes: loading sensor monitoring data of the pipe jacking machine casing and the top of subsequent pipe sections; determining the stage of backsoil effect and the degree of impact on the sidewall support of the foundation pit based on pipe-soil contact pressure data and soil displacement data; calculating a backsoil effect development index based on the stage of the backsoil effect and the degree of impact; identifying the development location of the backsoil effect and obtaining the grouting intervention area when the backsoil effect is in the vertical expansion stage, and performing enhanced grouting; activating the mechanical blocking device at the tail of the pipe jacking machine casing if the backsoil effect development index exceeds a first warning threshold; and generating a warning signal and adjusting the jacking parameters if the backsoil effect development index exceeds a second warning threshold. This invention achieves real-time perception and hierarchical active control of the backsoil effect, ensuring the construction safety of the foundation pit.

The application belongs to the technical field of oilfield downhole operation sealing, and discloses a downhole drilling plugging tool and a plugging method, wherein the lower end of the antenna device part is connected with the inner wall of the outer pipe through threads, the upper end of the electric control device is connected with the inner part of the outer pipe through threads, the inner wall of the lower end of the electric control device is connected with the outer wall of the upper end of the power device through threads, the inner wall of the upper end of the outer circulating sleeve is connected with the outer wall of the lower end of the power device through threads, the outer wall of the sliding sleeve is slidingly connected with the inner part of the outer circulating sleeve, the upper ball valve seat is only in contact with the reversing ball valve, and the outer wall of the joint is connected with the inner wall of the outer pipe through threads. The application can realize downhole non-drilling plugging in the case of leakage in the drilling process, reduce well control risk and shorten the drilling cycle, and the plugging vortex generated by the jet flow can reinforce the well wall.

The application discloses a long-distance small-diameter shield tunneling measurement method and relates to the shield tunneling field, which comprises the following steps: carrying out the re-measurement of the original control point and the encryption control point plane control network and the elevation control network outside the hole, and establishing a hole outside measurement datum; based on the hole outside measurement datum, arranging the control points around the working well, and performing periodic re-measurement, wherein the working well comprises a starting well L3 and a receiving well L2; using the multi-medium coordinate transfer to complete the contact measurement between the well and the underground, introducing the ground measurement datum into the underground, and then introducing the elevation control point near the well mouth into the working well by using the inverted scale method. The application effectively solves the receiving deviation problem of the long-distance small-diameter shield curve segment caused by error accumulation through the whole process layered measurement steps of the hole outside datum establishment, the periodic re-measurement of the working well control point, the contact measurement between the well and the underground, the whole hole closed traverse measurement and the post-penetration traverse rechecking, and the high-precision penetration of the >=2km long-distance tunneling is ensured.

The application relates to the field of seeding, in particular to a cotton automatic seeding machine, which comprises a movable frame, a rolling roller arranged on the outer surface of one end of the movable frame, and a seeding sleeve which is detachably arranged on the outer surface of the rolling roller. A small hydraulic pump is fixedly arranged on the inner wall surface of the top of the seeding sleeve. A conical extrusion block is fixedly connected to the output end of the small hydraulic pump. A positioning clamping plate is arranged on the outer surface of the output end of the small hydraulic pump. When the seeding sleeve is inserted into the soil, four arc-shaped extrusion plates are inserted into the soil, and the arc-shaped extrusion plates form a conical groove in the soil. After the arc-shaped extrusion plates are inserted, the conical extrusion block is pushed by the small hydraulic pump. When the conical extrusion block continuously descends, the arc-shaped extrusion plates are pushed and expanded, so that the size of the groove is expanded. At this time, the length of the arc-shaped extrusion plates can well control the depth of the soil.

The present application belongs to the technical field of oil and gas drilling engineering, and specifically relates to a tripping automatic grouting system and a continuous monitoring and intelligent control method, which comprises an anti-overflow pipe, a continuous overflow pipeline, an outlet flow accurate measurement unit, a liquid level sensor, a circulating tank, a driller display control unit, a tripping well depth tracking system, a grouting circulation control device and an electric control box. The electric control box is integrated with an intelligent measurement and control unit. The outlet flow accurate measurement unit is arranged on the anti-overflow pipe and connected with the circulating tank through the continuous overflow pipeline. The outlet flow accurate measurement unit is provided with a radar liquid level meter, a radar wave flow speed sensor and an industrial camera. The split structure is combined and installed to accurately measure the return and outlet flow, so that the real-time monitoring is significantly improved, the continuous monitoring is fundamentally improved, the monitoring accuracy is greatly improved, the adaptability to complex working conditions is high, the degree of intelligence is high, the manual intervention is less, and the well control safety is significantly improved.

The application discloses a reconstruction method and system for a complex fracture type water-containing oil and gas reservoir horizontal well, belongs to the field of fracturing reconstruction process technology of low-permeability tight oil and gas fields, and has the advantages that the development characteristics of a fracture zone are determined according to the sand body geological characteristics and seismic data of a horizontal well control area; the fracture type reservoir type corresponding to the position of each fracturing section in the direction of the horizontal well cylinder is determined according to the development characteristics of the fracture zone and the relative position relationship of the horizontal well; the differential fracturing process parameters of each fracturing section are determined according to the fracture type reservoir type and the effective fracture reconstruction range on both sides of the perforation points of the corresponding fracturing section, and fracturing reconstruction is carried out; the method is designed by avoiding the reconstruction method of the fracture zone, the water-containing layer of the fracture zone and the fracture-induced fracture is avoided, the probability of water outflow of the horizontal well is reduced, and the implementation effect of the segmented fracturing reconstruction of the water-containing oil and gas reservoir horizontal well is improved.

The invention discloses a coiled tubing wellhead quick connecting device with a hydraulic flange, which belongs to the technical field of petroleum equipment and comprises a blowout prevention pipe connecting piece, a hydraulic connector and a hydraulic clamping system. The upper end of the blowout prevention pipe connecting piece is provided with a standard union joint which is quickly connected with a blowout prevention box or a blowout prevention pipe; a first step matched with the hydraulic connector is arranged at the lower end of the blowout prevention pipe connecting piece, and the lower end face of the first step is used for axial limiting of the blowout prevention pipe connecting piece. A flange plate connected with an external flange is arranged at the lower end of the hydraulic connector; and the hydraulic clamping system is used for locking or unfolding the blowout prevention pipe connecting piece and the hydraulic connector. The continuous pipe well control connecting equipment is safely and rapidly mounted and dismounted in a hydraulic control operation mode, and the situation that operators manually mount and dismount the well control equipment in a long-time and high-strength mode when the operators are exposed to the lower portion of a hoisting injection head is avoided.

This utility model relates to an anti-backflow type tubing plug for shale oil and gas well pressurized completion string operations, comprising an upper connector, a lower connector, a plug core, and a connecting pipe. The upper and lower connectors are hollow pipes. The upper connector has a neck section that forms a seal with the upper end of the plug core. The plug core has a groove, and the upper connector is fitted with a shear pin, which is inserted into the groove to engage the plug core. The connecting pipe is pressed against the upper and lower connectors and includes a central hole and a flow channel on its outer wall. The lower end of the plug core has an elastic locking ring, which is placed in the central hole. The diameter of the locking ring in its extended state is larger than the inner diameter of the central hole. When the plug is installed in the oil and gas well, it initially forms a seal. Releasing the plug core opens the plug, allowing oil and gas to flow out smoothly. The plug core in this plug has an anti-backflow function, thereby ensuring well control safety during pressurized oil and gas well operations.

The application discloses a well completion method for repairing a well primary barrier through a pin connection, and belongs to the technical field of oil well completion. The method first judges the integrity of a well secondary barrier. If the integrity of the well secondary barrier is unqualified, a well completion pipe string is replaced. If the integrity of the well secondary barrier is qualified, the sealing property of a packer seal is judged. If the sealing property of the packer is qualified, the original well pipe is pulled out, the integrity of a field end box end in a well bore is judged according to the pin end state of the original well pipe. If the integrity of the field end box end in the well bore is qualified, a new well completion pipe is lowered into the well bore and is connected with the original well pipe in the well bore through a pin connection for well completion. The application avoids the relatively high well control risk in the complicated treatment process in the operation process of completely replacing the production pipe string for the well completion of the low-pressure and low-efficiency well, causes the risk of the downhole secondary complexity, provides a new idea for the well completion process innovation of the low-pressure and low-efficiency well, and has great field application value and reference significance.