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49 results about "Snubbing" patented technology
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Snubbing is a type of heavy well intervention performed on oil and gas wells. It involves running the BHA on a pipe string using a hydraulic workover rig. Unlike wireline or coiled tubing, the pipe is not spooled off a drum but made up and broken up while running in and pulling out, much like conventional drill pipe. Due to the large rigup, it is only used for the most demanding of operations when lighter intervention techniques do not offer the strength and durability. Unlike conventional drilling and completions operations, snubbing can be performed with the well still under pressure. When done so, it is called hydraulic workover. It can also be performed without having to remove the Christmas tree from the wellhead.
Drilling machine fault diagnosis, alarm and processing method and device
PendingCN121997089Aimprove accuracyImprove generalization abilityStructural/machines measurementInference methodsMotor speedData pack
The invention provides a drilling machine fault diagnosis, alarm and processing method and device.The method comprises the steps that operation data and logging data of a target drilling machine are obtained, and the operation data comprise at least one of motor torque, motor rotating speed, motor power and motor temperature; the logging data comprises at least one of bit pressure, rotating speed, pumping pressure, well depth and torque; performing timestamp alignment, data normalization, feature cleaning and missing compensation on the operation data and the logging data to construct a unified time sequence multi-modal feature set; and inputting the unified time sequence multi-modal feature set into a pre-trained large language model, performing anomaly diagnosis on the target drilling machine, and outputting an improvement suggestion. According to the scheme, the technical problem that existing drilling machine fault diagnosis is low in efficiency and accuracy is solved, and the technical effect of improving the accuracy, generalization and response speed of drilling machine fault diagnosis is achieved.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Control method and system for a choke and kill manifold
ActiveCN117662042BOpening adjustmentreduce openingFlushingWell/borehole valve arrangementsWell killWell drilling
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.
Owner:CHINA NAT PETROLEUM CORP +1
A method for gas kick control by integrating shut-in and absorption
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.
Owner:BEIJING UNIV OF CHEM TECH
Intelligent choke and kill manifold
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.
Owner:YANCHENG YUYANG PETROLEUM MASCH CO LTD
An underwell gas invasion and loss parameter inversion method based on unscented Kalman filter
ActiveCN121525415BDesign optimisation/simulationConstraint-based CADPetroleum oilGas volume fraction
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.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Intelligent stratified injection and production tubing and process for carbon dioxide throughput
This invention relates to a smart stratified injection-production string for carbon dioxide injection, comprising a first tubing and a second tubing connected by a backwash valve or a release tool. A hydraulic feedback pump is installed on the first tubing, and several packers are installed at intervals on the second tubing. A smart control switch tool is installed between two adjacent packers, each corresponding to an oil layer. An anchoring tool is also installed on the second tubing. This invention enables stratified injection, well shut-in, well release, and stratified production of carbon dioxide in any one or more layers without moving the injection-production string. This effectively improves the effective utilization rate of carbon dioxide, the degree of oil layer utilization, and the injection-production conversion efficiency, thereby increasing injection-production efficiency and oil recovery rate, reducing well workover work, well occupation time, and well cleaning and well layer contamination, and lowering operating costs.
Owner:PETROCHINA CO LTD
Methods of swabbing liquid loaded wells, and killing wells, with the use of compression pumps, regulators and filtration techniques
A method to unload a fluid mixture from an underground production tubing, in order to reduce the hydrostatic pressure within the fluid mixture. A method to kill an oil or gas well by equalizing pressure between the production tubing, the casing annulus, and a surface tank battery, by de-pressurizing the fluid within the production tubing and the casing annulus, and by pumping a kill fluid. One goal of the methods may be to avoid discharging unwanted liquid phase or gas phase to the atmosphere, therefore reducing unnecessary emissions, and valuing the recovered products.
Owner:ZENRG SERVICES LLC
Throttling well killing manifold sand prevention device
The utility model discloses a throttling kill manifold sand prevention device, which belongs to the technical field of throttling kill manifolds and comprises an oil outlet pipe, a conical filter cartridge is fixedly sleeved on the outer side of the top end of the oil outlet pipe, and a first three-way connector is fixedly connected with the top end of the conical filter cartridge. Gate valves are fixedly installed at the two ends of the top of the first three-way connector correspondingly, and first oil guide pipes are fixedly installed at one ends of the two gate valves correspondingly. According to the utility model, when exploited oil liquid is discharged from the oil outlet pipe, large-particle impurities in the oil liquid are directly filtered by using the conical filter hopper and the filter holes in the inner cavity of the conical filter cartridge, so that the impurities in the oil liquid are prevented from influencing a first three-way joint and a gate valve which are subsequently connected, and the scraper is driven to rotate by using the first motor; and impurities filtered from the bottom surface of the conical filter hopper are cleaned by using the scraper, so that the filtering effect of the filter holes is ensured.
Owner:YANCHENG LILIN PETROLEUM MACHINERY
A method for controlling a blowout in a marine well by drilling a riser.
This invention discloses a method for controlling a blowout in a marine well by drilling through the riser. The method includes the following steps: establishing a working face using scaffolding; pre-positioning the crane vessel, workboat, and guard vessel before the operation; placing the casing drilling equipment, high-pressure pump, fire-fighting equipment, and protective gear on the workboat or wellhead area before drilling; selecting the drilling location and number of holes; pre-installing the riser backplate before drilling the outer riser; drilling the riser, technical casing, and production casing sequentially, confirming the safety of each annulus layer; upon discovering an overflow during drilling, quickly tightening the backplate; and implementing well control operations using heavy brine, barite slurry, or non-dispersible cement slurry. This invention addresses blowout situations in drilling or production wells on offshore platforms. It allows for close deployment of all aspects during emergency rescue, rapid sealing of the outer riser, and connection of the well control manifold to the internal wellbore. This enables successful well control and sealing operations in each annulus layer. The method is highly operable, has a short construction period, and requires minimal investment.
Owner:CNOOC TIANJIN BRANCH
System and method for monitoring annulus liquid level in drilling well leakage state
The invention discloses a system and method for monitoring the annulus liquid level in the drilling well leakage state, and the system comprises a wellhead temporary plugging device which is used for achieving the temporary plugging of an upper port of a shaft during the drilling well leakage so as to block the upward propagation path of sound waves; the annulus liquid level monitoring device is arranged on the well killing manifold and is used for measuring a detection signal representing the dynamic change characteristics of the annulus liquid level by adopting a sound wave measurement technology; and the data processing device is used for obtaining a dynamic environmental control liquid level measurement value according to the detection signal. Under the leakage state, the blowout preventer can be not closed, the annular liquid level can be continuously monitored, and the injection amount of drilling fluid can be accurately controlled.
Owner:SINOPEC OILFIELD SERVICE CORPORATION +2
Completion string, completion method, and injection-production system
The application provides a well completion string, a well completion method and an injection-production system, the well completion string comprising a production casing and a well completion assembly connected to one end of the production casing, the production casing comprising one or more limiting splices, the multiple limiting splices being distributed along the axial direction of the production casing, a limiting part being arranged on the inner wall of the limiting splices, the limiting part being convex relative to the inner wall of the main body of the production casing; the limiting part is used for cooperating with a blowout plug to carry out blowout control, and / or is used for cooperating with a sealing plug at the bottom of a central pipe string lowered into the production casing to carry out string limiting. According to the technical scheme of the application, the limiting splices are designed in the production casing of the well completion string, the limiting part of the limiting splices can cooperate with the blowout plug to carry out blowout control or cooperate with the central pipe string lowered into the production casing to realize the setting of the string, stable blowout control can be realized under the condition that the well bottom is under pressure, and the setting of the central pipe string without packers can be realized, which provides favorable conditions for corresponding injection-production operations.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1
Experimental device for simulating well killing effect of rescue well at different communication points
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.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Under-pressure operation machine with coiled tubing injection head mode
The invention discloses an under-pressure operation machine with a coiled tubing injection head mode, and relates to the technical field of petroleum machinery, the under-pressure operation machine comprises an injection head and a hydraulic catwalk, the hydraulic catwalk is located on one side of the injection head, an injection module and a guide cone are installed in the injection head, and the guide cone is located above the injection module; the hydraulic catwalk is provided with a conveying rail used for containing a pipe column, a first mechanical arm used for placing the pipe column on the conveying rail and a mast obliquely extending towards the upper end of the injection head, the mast is provided with a second mechanical arm capable of sliding in the axis direction of the mast, and the first mechanical arm and the second mechanical arm are each provided with a hydraulic elevator. The hydraulic elevator can grab the tubular column placed on the conveying rail. The device not only has the functions of a conventional under-pressure operation machine, but also has most of the advantages of the coiled tubing, so that the advantages of coiled tubing operation and under-pressure operation are perfectly combined.
Owner:SICHUAN QICAI ENERGY TECH CO LTD
Method and system for the simultaneous mining of coal and natural gas
The application provides a coal and natural gas cooperative mining method and a mining system, and the method comprises the following steps: arranging a natural gas collecting chamber in a stable rock layer below a coal seam, arranging a natural gas collecting device in the natural gas collecting chamber, and pumping natural gas in a gas layer below the rock layer; and conveying the pumped natural gas to the ground through a gas pipeline, wherein the gas pipeline is arranged in the natural gas collecting chamber, a coal mining roadway and a auxiliary shaft in sequence, and a wellhead of the auxiliary shaft is arranged above the ground. The natural gas collecting chamber is arranged in the stable rock layer below the coal seam, the natural gas collecting device is arranged in the natural gas collecting chamber, and the natural gas in the gas layer below the rock layer is pumped, so that the natural gas well does not need to pass through the coal seam, the problem of well killing of natural gas in the process of cooperative mining of coal and natural gas can be effectively avoided, and the influence of mining and the influence of overburden rock fracture on the natural gas well caused by the coal seam mining can be reduced.
Owner:SHENHUA XINJIE ENERGY
An ultra-high pressure choke manifold
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.
Owner:JIANGSU JULONGHU MASCH MFG CO LTD
A single pump brake device
This invention discloses a single-unit pump braking device, relating to the field of geological exploration drilling rig technology. It includes a coupling, a clutch, a pump-connected universal joint, a main air circuit, and a control air circuit. The coupling includes a coupling output shaft and a charging / adjusting valve. The coupling output shaft is the power output part of the independent pump unit, and the charging / adjusting valve is the coupling speed regulating device. By modifying the clutch friction plates, clutch hub, and clutch air bladder, installing a pneumatic control valve, and modifying the entire air circuit, the pump shutdown time of the single-unit pump unit is significantly shortened to meet actual working conditions. Simultaneously, the desired braking condition can be selected according to actual working conditions, effectively achieving safe and rapid well control operations, effectively reducing well control risks, and ensuring well control safety.
Owner:CHINA NAT PETROLEUM CORP +1
Offshore drilling shaft pressure control device
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.
Owner:CHINA NAT OFFSHORE OIL CORP +1
Controlled pressure drilling overflow well killing simulation system and method, medium and electronic equipment
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.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1
Oil well annulus liquid level opening measuring method and system
The invention belongs to the technical field of oil well drilling and mining, and particularly relates to an oil well annulus liquid level opening measuring method and system.The method comprises the steps that a Y-shaped tee joint and a manual flat valve above the Y-shaped tee joint are installed at a kill manifold valve, and underground liquid level detection equipment is connected; annulus sound wave signals are collected in the well opening state; sequentially carrying out wavelet threshold noise reduction and self-adaptive notch filtering on the signal; an echo period T is determined through fusion of autocorrelation analysis and spectral analysis, sliding window template matching is carried out according to the period, and liquid level echo signals are extracted and enhanced; finally, the liquid level depth is calculated, dynamic verification is conducted, and then a result is output. Through collaborative innovation of a mechanical structure and a signal processing algorithm, real-time, automatic and high-precision measurement of the annulus liquid level without well shut-in is achieved, the defect that well shut-in operation is needed in a traditional method is overcome, and production continuity and operation safety are remarkably improved.
Owner:杭州瑞利超声科技有限公司
A blowout preventer for a well service string and methods of use
The application is a blowout prevention tool for well operation pipe column and its using method, the blowout prevention tool is provided with circulation passage opening mechanism, anchoring mechanism and sealing mechanism, the well killing joint in the circulation passage opening mechanism can be connected with the well killing pipeline joint, the circulation passage opening mechanism, the anchoring mechanism and the sealing mechanism are connected through the lower connecting joint, the anchor claw, the inner support cylinder and the sealing mechanism upper joint in sequence. The tool structure is simple, and it is a well safety control tool which can be quickly installed, effectively seal the well operation pipe column and prevent overflow upwelling. When the well overflow is found, the tool can be quickly installed in the well operation pipe column to realize the anchoring of the tool in the well operation pipe column. The application can effectively reduce the fire accidents and environmental pollution accidents caused by the sudden blowout of oil and gas wells, reduce the waste and loss of oil resources and reduce the safety production risk.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1
Ultra-low density leak-off workover fluid and method of making same
The present application belongs to the technical field of drilling and workover fluid, and specifically discloses an ultra-low density leak-proof workover fluid, which is composed of base fluid and micro-bubble fluid; wherein the base fluid comprises structural stabilizer, viscosity-increasing and filtration-reducing agent, pH regulator, bactericide, corrosion inhibitor, surfactant and water; and the micro-bubble fluid comprises foaming agent, bubble stabilizer and water. The preparation method of the workover fluid is as follows: first, preparing the base fluid; then, preparing the micro-bubble fluid; finally, adding the micro-bubble fluid into the base fluid and mixing to obtain the finished product. The significant effect of the present application is that the workover fluid has good viscosity-increasing and shear-increasing effects, short natural degradation period, small reservoir damage, and can be applied to various oil and gas wells with formation pressure coefficient less than 1.0, well killing and workover operation, can greatly reduce the use amount of conventional working fluid to shorten the flowback period, and has low requirement on production equipment and is easy to implement.
Owner:KELAMAYI WEITE TECH CO LTD
A managed pressure drilling system
A kind of managed pressure drilling system, including drilling pump, automatic throttle manifold module, circulating tank, drilling drilling tool, main flow module and bypass shunt module;Drilling drilling tool includes rotary control head, for forming wellbore annulus kill line and throttle line;Main flow module includes main flow pipeline and the main flow valve group being installed on main flow pipeline;Bypass flow module includes bypass flow pipeline and the bypass flow valve group being installed on bypass flow pipeline;Automatic throttle manifold module includes throttle pipeline and the throttle valve group being arranged on the throttle pipeline;The present application avoids the use of back pressure pump system by the setting of bypass shunt module, reduces the failure rate of the managed pressure drilling system during drilling process, reduces the complexity of field equipment connection.
Owner:SINOPEK PETROLEUM IZHINIRING TECH SERVIS KO LTD +2
A method for gas kick control by integrating shut-in and absorption
The application discloses a kind of integrated gas invasion control methods of retardation absorption, applied to the wellbore of gas invasion, comprising the following steps: composite slurry column system is constructed in wellbore, the composite slurry column system includes gas absorption plug and gas encountering viscosity increasing plug from bottom to top;The gas absorption plug converts free gas into solid adsorption state or liquid solution state by adding gas absorption material in drilling fluid, and reduces the volume of gas phase in wellbore in situ;The gas encountering viscosity increasing plug triggers viscosity increase when residual gas enters by adding gas encountering response material in drilling fluid, increases fluid resistance, slows down gas phase slip.This application realizes the synergistic gas control effect of first absorption reduction and then viscosity increase and speed reduction through the segmented composite slurry column system, realizes early active intervention of gas invasion, avoids fluid instability and gas channeling risk, and improves kill success rate.
Owner:BEIJING UNIV OF CHEM TECH
A choke and kill manifold for offshore oil production with pressure regulating function
The application discloses a throttling well killing manifold with pressure regulating function for offshore oil exploitation, and relates to the technical field of well killing manifolds. The throttling well killing manifold comprises a base, a four-way structure, a filtering device, a throttling device, an external connecting pipe, a liquid injection structure and a damping support. The filter hole size of the filter plate can be dynamically adjusted according to the sandstone content in oil and gas. When the sandstone content is high, the filter hole size is shrunk to realize more fine filtering effect. When the sandstone content is low, the filter hole size is increased to improve the passing amount of fluid, reduce the pressure loss caused by the increase of filter resistance, prolong the service life of the filter screen, and automatically adjust the opening degree of the throttling valve according to the pressure in the pipeline. The fluid flow keeps stable. When the pressure in the pipeline sharply rises due to abnormal conditions, the throttling valve is automatically closed to cut off the fluid passage of the pipeline, and the pressure relief device is opened to release part of the excessively high pressure, so that the pressure in the pipeline rapidly falls back to the safety range.
Owner:HONGZE DONGJUN MACHINERY
Sand control choke manifold
Owner:JIANGSU YIDELONG GASOLINEEUM MACHINERY
Intelligent throttling kill manifold
The invention belongs to the technical field of manifolds, and particularly relates to an intelligent throttling kill manifold which comprises a base, a plurality of movable supporting assemblies are slidably connected to the base, the movable supporting assemblies are fixedly connected with a four-way piece, the four-way piece is fixedly connected with a plurality of valve body assemblies, and every two adjacent valve body assemblies are fixed through a quick dismounting and mounting assembly. The quick dismounting and mounting assembly is fixed to the movable supporting assemblies, the four-way piece and the quick dismounting and mounting assembly are fixed to the different movable supporting assemblies, the positions of the four-way piece and the multiple valve body assemblies can be changed by changing the positions of the movable supporting assemblies on the base, and then butt joint mounting of oil well pipelines at different positions is adapted; the two adjacent valve body assemblies are rapidly disassembled and assembled through the rapid disassembling and assembling assemblies, rapid overhauling and replacing of the valve body assemblies are achieved, the maintenance efficiency of the throttling kill manifold is improved, the throttling kill manifold can be rapidly put into use, and therefore the shutdown time is shortened.
Owner:YANCHENG YUYANG PETROLEUM MASCH CO LTD
A method of fast killing a well without a bit at the bottom of the well
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.
Owner:CHINA NAT PETROLEUM CORP +1
Under-pressure sand washing method
The invention relates to the technical field of oil field underground workover treatment, in particular to an under-pressure sand washing method. The method specifically comprises the steps that according to the target well condition, an under-pressure positive circulation sand washing method and / or an under-pressure reverse circulation sand washing method are / is selected for sand washing; the under-pressure reverse circulation sand washing method comprises the steps that the reverse circulation sand washing tool string is put into a well under pressure to reach the sand surface position; a reverse circulation sand washing tool string is connected with a grit chamber through a first ground manifold, and a wellhead four-way joint is connected with a pump truck through a well killing manifold; the pump truck is started, the sand surface is washed, and in the washing process, working fluid is input into an underground sleeve through a well killing manifold and a wellhead four-way joint and then returns upwards to enter a grit chamber through a reverse circulation sand washing tool string and a first ground manifold; and after the target stratum is flushed, the pump truck is controlled to stop, and under-pressure reverse circulation sand flushing is completed. The problems that an existing conventional sand washing method cannot meet the requirement for under-pressure sand washing, stratum energy cannot be protected, and meanwhile when sand washing is conducted after well killing, working fluid is likely to invade a stratum to pollute a production layer are solved.
Owner:DAQING OILFIELD CO LTD +1
A workover device and method based on homogeneous kill fluid
The present application relates to the technical field of oil and gas development, and discloses a workover device and method based on homogeneous well killing fluid, wherein the workover method of the workover device based on homogeneous well killing fluid comprises the following steps: preparing homogeneous well killing fluid, preparing spacer fluid, carrying out circulating well killing, carrying out oil pipe lifting operation after successful well killing, then carrying out well passing operation and oil pipe lowering operation, ensuring that the oil pipe is not damaged, and then using well washing fluid to carry out reverse circulation well washing, if the bottom hole plug cannot be discharged, using well killing fluid to carry out drill grinding treatment until the well washing is qualified, connecting water injection well process pipeline, carrying out test injection operation, confirming that the well head is not punctured and not leaked, and then the workover is successful; the present application can completely remove the bottom hole plug, ensure the smoothness of the wellbore, improve the workover quality and efficiency, and solve the problem that under the condition of high injection pressure of the water injection well, the construction efficiency is affected by factors such as formation leakage, test pressure sleeve breaking and the like before carrying out conventional string checking, plugging sidetracking and other downhole operations.
Owner:PETROCHINA CO LTD
Method, device, equipment and medium for replacing high-pour-point oil after production halt of deepwater high-pour-point oil field
The invention relates to the field of deepwater oil-gas field development, and discloses a method, a device, equipment and a medium for replacing high-pour-point oil after production halt of a deepwater high-pour-point oil field, and a rapid temperature drop area and a slow temperature drop area of each single well are determined according to the volumes of Christmas trees and the volumes of wellhead joints of a plurality of single wells in an oil field production area respectively. And replacing the high pour-point oil in the rapid temperature drop area of each single well with diesel oil one by one in an overlapped well killing mode. Replacing the high pour-point oil in the jumper pipe of each single well with diesel oil, replacing the high pour-point oil in the subsea pipe into the target facility, and replacing the high pour-point oil in the slow temperature drop area of each single well with diesel oil. According to the method, temperature sensitive area grading is conducted on the areas, needing to be replaced, of the single wells, the rapid temperature drop area and the slow temperature drop area of each single well are determined, according to the temperature drop rates of the different areas, the areas with the rapid resource replacement temperature drop rate and the areas with the slow delayed replacement temperature drop rate are preferentially concentrated, and the blocking risk of underwater equipment and facilities is effectively reduced.
Owner:CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1