6301results about "Sealing/packing" patented technology

The grouting drilling orifice reinforcement construction method based on intelligent control comprises the five steps that S1, drilling machine parameter signals are collected through operation of a drilling machine, and meanwhile geological data signals are collected through in-hole detection equipment; s2, the drilling machine parameter signals and the geological data signals are input into an intelligent decision-making center for fusion processing, and geological sensing signals are generated; s3, based on the geological sensing signal, calling a preset decision-making model through the intelligent decision-making center for calculation, and generating a grouting control instruction signal; s4, grouting operation is executed according to the grouting control instruction signal, and meanwhile a grouting process monitoring signal is collected and fed back to the intelligent decision center in real time; and S5, after grouting is completed, hole opening stable monitoring signals are continuously collected, and when the effect evaluation signals do not reach the standard, reinforcing grouting signals are automatically triggered, and grouting operation is executed again. According to the intelligent die adjusting method for the die-casting machine, the problems that drill holes are prone to collapse, reinforcement depends on experience, and quality is difficult to control can be solved.

The invention discloses a multi-valve cooperative control system and method for a choke manifold control box, and the method comprises the steps: collecting process parameters and valve state parameters in real time through a data collection module, calculating the required total throttling pressure drop or total flow through a data analysis module based on the target bottom hole pressure or target flow set by an operator in combination with real-time data, and calculating the total throttling pressure drop or total flow according to the calculated total throttling pressure drop or total flow; the valve role distribution module distributes valve roles according to a preset rule, the instruction generation module distributes total demands to all valves according to a proportion to generate a target opening instruction set, the instruction verification module verifies instruction safety through a safety interlocking matrix, and the valve driving module executes the instruction passing verification. The feedback optimization module calculates the correction based on the actual parameter deviation and performs iterative optimization; the problems of insufficient precision, low response speed and poor safety in multi-valve cooperative control are solved, the precision and reliability of throttling control are improved, valve abrasion is reduced, and the system anti-jamming capability and fault emergency response efficiency during sudden change of working conditions are enhanced.

Provided is a safety valve, a well system, and a method. The safety valve, in one aspect, includes a first portion, the first portion including a safety valve sub having a sliding sleeve, the first portion configured to be run-in-hole as part of wellbore tubing. The safety valve, in accordance with this aspect, further includes a second portion, the second portion configured to be run-in-hole after the first portion. The safety valve, in accordance with this aspect, further includes a third portion, the third portion including a mechanical connecting apparatus, the third portion configured to be run-in-hole after the second portion, the mechanical connecting apparatus configured to couple with the sliding sleeve of the first portion and the bore flow management actuator of the second portion to axially fix together the sliding sleeve and at least a portion of the bore flow management actuator.

A subsurface safety valve for a wellbore for production of fluids from a subsurface formation comprises a drive portion and an actuator portion. The drive portion comprises a first magnet assembly and the actuator portion comprises a second magnet assembly that is magnetically coupled to the first magnet assembly. At least one of the first magnet assembly or the second magnet assembly comprises a spatially rotated array of magnets arranged such that a magnetic field emitted from an operative side of the spatially rotated array of magnets facing a magnetic coupling is non-zero and such that the magnetic field emitted from a non-operative side of the spatially rotated array of magnets that is opposite the operative side is about zero.

The invention discloses an earth surface directional drilling high-pressure deep hole grouting construction method based on steel sleeve hole fixing. The earth surface directional drilling high-pressure deep hole grouting construction method comprises the following steps that firstly, a directional drilling machine is used for vertically drilling a grouting hole downwards; secondly, a plurality of steel floral tubes are sequentially put down in the three-opening first branch grouting hole; thirdly, cement-bentonite-based sleeve shell materials are continuously injected into the first section of the steel floral tube to the inner bottom of a first branch grouting hole of the three-opening hole, and an annular space between the first branch grouting hole of the three-opening hole and the steel floral tube string is filled with the cement-bentonite-based sleeve shell materials; fourthly, a packer is lowered to the bottom of the three-opening first branch grouting hole; a packing section is formed in front of the packer; and fifthly, cement grout is injected into the grouting pipe, grouting is conducted on the packing section, the finally-set cement-bentonite-based casing material is split and damaged under the effect of grouting pressure, and the grouting grout is injected into the stratum to be reinforced through the grout channel. According to the method, the hole collapse phenomenon when the grouting hole penetrates through the unfavorable geological section can be prevented, the grouting stopping effect of the packer is guaranteed, and retreating type segmented grouting construction is guaranteed.

A downhole tool having a mandrel. The mandrel includes a proximate end; a distal end; a bore having a respective seat associated therewith; and an outer surface. The pump out seat assembly is movably disposed within the bore. The pump out seat is movable between a first position and an other position. In the first position the pump out seat prevents flow through the bore. In the other position the pump out seat does not prevent flow through the bore.

To provide a method for backfilling a borehole, which enables the borehole to be backfilled with high accuracy, and to provide a filler-containing swelling-retardant granular material for backfilling a borehole.SOLUTION: A method for backfilling a borehole involves transporting a container filled with a swellable filler, a plurality of filler-containing swelling-retardant granular materials having a swelling-retardant layer that coats a surface of the swellable filler and delays the onset of swelling of the swellable filler, and water to a predetermined position within the borehole, and then releasing the plurality of filler-containing swelling-retardant granular materials and the water from the inside to the outside of the container, causing the water to penetrate the swellable filler in the plurality of filler-containing swelling-retardant granular materials, thereby causing the swellable filler to collapse the swelling-retardant layer and swell, thereby backfilling the borehole.SELECTED DRAWING: Figure 1

The invention relates to the technical field of oil development, in particular to a shale oil and gas fracturing sliding sleeve capable of being opened and closed repeatedly and a using method. According to the technical scheme, a central pipe fracturing liquid inlet is formed in the upper side of a central pipe, and a reversing rail is arranged on the surface of the outer wall of the middle; a sealing cylinder sleeve and a one-way circulating valve carrier are sleeved outside the central pipe, a fracturing piston, a swivel pressing cap and a reset spring are installed in an annulus, a constant-pressure opening cavity is formed in the inner wall of the fracturing piston, a swivel is installed in the swivel pressing cap, a track pin is installed in the swivel, and the position is moved along a reversing track on the surface of the outer wall of the central pipe through the track pin. The fracturing piston moves downwards to the position of the cylinder sleeve fracturing liquid outlet under the action of pressure, the fracturing function is started, fracturing liquid is sprayed out along the cylinder sleeve fracturing liquid outlet to enter a target fracturing layer, fracturing construction of a plurality of fracturing layers can be achieved through multiple times of fracturing liquid injection and injection stopping, the fracturing sliding sleeve can be repeatedly opened and closed, and the fracturing construction efficiency is improved. And fracturing construction requirements of shale oil and gas with different layers can be met.

The utility model relates to the technical field of gas extraction, in particular to an underground gas extraction blowout preventer, and mainly solves the technical problems that the existing gas extraction blowout preventer is high in spewing control difficulty, high in safety risk and high in sprayed slag cleaning workload. The device comprises a movable chassis, a deslagging box, a multi-way pipe, a drilling machine through pipe, a coal seam drilling pipe, a negative pressure pipe, a pressure relief buffer cover, a deslagging pipe and a pressure sensor. According to the device, gushing is detected through the pressure sensor, on-off of the negative pressure pipe and the slag discharging pipe is controlled in a feedback mode, dependence on manual experience is not needed, it can be guaranteed that gushing and corresponding equipment are started consistently, and the gushing control difficulty is greatly reduced; meanwhile, water and residual materials for slag spraying can be discharged into the slag discharging box through the slag discharging pipe in time to be collected, and the workload of slag spraying and cleaning is reduced; the device is further provided with a pressure relief buffer cover, when the pressure is too large due to gushing, buffering can be conducted through the pressure relief buffer cover, and damage to the device caused by the too large pressure is avoided.

The invention discloses underwater throttle valve element lowering and recycling equipment and a using method, and relates to the technical field of underwater oil extraction, the underwater throttle valve element lowering and recycling equipment comprises a guide protective cover, an ROV connector, a mounting plate, a lifting mechanism, a hanging ring, a butt joint assembly, an insertion cylinder and a locking assembly, and the guide protective cover is mounted on a valve body; the ROV interface is mounted at the top of the valve core; the lifting mechanism is mounted on the top surface of the mounting plate, and the telescopic end of the lifting mechanism extends downwards and penetrates through the mounting plate; the lifting ring is fixedly connected to the top end of the fixed end of the lifting mechanism so as to be connected with lifting equipment. The butt joint assembly is mounted below the mounting plate; the insertion cylinder is fixedly connected with the lifting end of the lifting mechanism, and the angle of the mounting plate can be adjusted under the guidance of the guide shield, so that the butt joint assembly is inserted into the ROV interface; the locking assembly is installed on the installation plate and can enable the butt joint assembly inserted into the ROV connector to be locked with or disengaged from the ROV connector, the structure is simple, use is convenient, and lowering and recycling work of the underwater throttle valve element can be efficiently and accurately completed.

The invention relates to the technical field of oil field workover treatment, in particular to a rapid blowout wrecking device and method for minor repair operation. According to the technical scheme, a lifting mechanism is installed on workover treatment equipment through a fixing mechanism, a rotary speed reducer is installed at the upper end of the lifting mechanism, a blowout wrecking rotating arm is installed on the upper portion of the rotary speed reducer, the outer end of the blowout wrecking rotating arm is fixedly connected with a fixing base, a turbine is installed in the fixing base, and a rotating short section is installed in the center of the turbine. The lower end of the rotary short section is movably connected with a full-bore plug valve; the worm is installed on one side of the turbine, the worm is driven by the hydraulic cycloid motor to rotate, the worm drives the turbine and the rotary short section to rotate, then the full-bore plug valve is driven to be rotationally connected to an oil pipe of a wellhead, then the switch knob is closed, and blowout wrecking is completed. The full-bore plug valve is installed through mechanical rotation, the follow-up loading function is achieved, potential safety hazards caused by manual installation of the full-bore plug valve are avoided, and rapid blowout wrecking work of blowout is achieved.

A completion system for CO2 storage monitoring includes a first well tubular metal structure, a second well tubular metal structure, cement arranged between the borehole and a second part of the second well tubular metal structure, a monitoring line extending along the second well tubular metal structure and into the cement, a production packer assembly providing a seal between the first and second well tubular metal structures, the production packer assembly having an anchoring unit, and an annular barrier unit. Each unit comprises a tubular metal part configured to be mounted as part of a first part of the second well tubular metal structure, the tubular metal part having an expandable metal sleeve having a circumferential groove with an anchoring element and a sealing element. The monitoring line extends through the anchoring and annular barrier units between the tubular metal part and the expandable metal sleeve.

The invention discloses a compression type external casing packer based on petroleum low-carbon exploitation, and relates to the technical field of oil field downhole tools, the compression type external casing packer comprises a casing pipe, a micro-deformation adjusting mechanism is arranged in the casing pipe, and when the packer is in the installation process, the micro-deformation adjusting mechanism is in a contraction state so as to guarantee that the packer can be smoothly put into the casing pipe; according to the device, the rubber sleeve assembly adopts a multi-section combined design and is formed by sequentially connecting at least three cylindrical rubber sleeves in series in the axial direction, the multiple sections of cylindrical rubber sleeves can achieve differential adaptation through cooperative deformation, aiming at the local diameter expanding section of the inner wall of the sleeve, the rubber sleeves at the corresponding positions can more sufficiently expand in the radial direction to fill gaps, and the sealing performance of the sleeve is improved. The expansion amount of a local reducing section can be properly controlled to avoid excessive extrusion, meanwhile, the contact area of the multiple sections of rubber barrels and the inner wall of the sleeve is larger, the contact pressure of the sealing face can be effectively dispersed, and a uniform and stable sealing pressure field is formed in the whole well section.

The invention discloses an integrated underwater low-pressure wellhead installation tie-back tool which comprises a main body and a tie-back connector. The main body comprises a casing coupling, a body and a feeding connector which are sequentially connected, the body is sleeved with a rotating ring, and a plurality of detachable guide arms are evenly distributed on the outer portion of the rotating ring along the circumference; the feeding joint is connected with a low-pressure wellhead or a tie-back joint; the feeding connector is of a sleeve structure, and a locking structure, a guide groove and a sealing structure are sequentially formed on the outer wall of the feeding connector from top to bottom. The tie-back joint comprises a large-diameter section and a small-diameter section which are integrally formed; a guide inclined face, a limiting structure and a connecting structure are sequentially formed on the inner wall of the large-diameter section from top to bottom. One tool has all functions of two tools, the number of the tools is reduced, and the difficulty of transportation, tool preparation and maintenance is reduced; the tool is connected with the low-pressure wellhead in a tie-back mode, only pressing and over-lifting are needed, rotation is not needed, the requirements for the inclination angle of the low-pressure wellhead and the platform in-position precision are low, and the operation difficulty is lowered.

The invention relates to a high-temperature-resistant and high-salt-resistant carbon dot-hydrogel blocking agent and a preparation method and application thereof.The preparation method comprises the following steps that a reaction monomer, an initiator, an organic cross-linking agent and an inorganic cross-linking agent are added into water to be evenly mixed, and a precursor mixed solution is obtained; adding a polysaccharide polymer into the precursor mixed solution, and stirring and dissolving to obtain a hydrogel prepolymer; polymerizing and partially hydrolyzing the hydrogel prepolymer to obtain partially hydrolyzed interpenetrating network hydrogel; the partially hydrolyzed interpenetrating network hydrogel is carbonized at the constant temperature of 50-70 DEG C to form carbon dots, and the carbon dot-hydrogel blocking agent is obtained. The prepared carbon dot-hydrogel has the advantages that synthesis is green, raw materials are easy to obtain, and toxic reagents do not need to be introduced; the nano enhancement effect of the carbon dots and the physical entanglement effect of the polysaccharide polymer enable the obtained hydrogel to have high toughness and compression strength after high salinity and high-temperature aging, and the hydrogel can be used for profile control and water shutoff of high-temperature and high-salinity oil reservoirs so as to improve the recovery rate of crude oil.

A system includes production tubing, a first packer, a second packer, one or more first ports, and one or more first conduits. The production tubing extends downhole through multiple subsurface formations including a first formation and a second formation that are gas-bearing formations and a third formation separating the first formation and the second formation. The first packer is positioned in the third formation. The second packer is positioned uphole of the formations. The one or more first ports extend through the production tubing downhole of the first packer. The first ports are movable between an open configuration and a closed configuration. The one or more first conduits extend from a first opening in an outer surface of the production tubing to a second opening in the outer surface of the production tubing, with a first valve positioned between the first opening and the second opening.

The invention relates to the field of petroleum well repair engineering, and particularly discloses a secondary well control automation system for conventional minor repair operation of an oil and gas field, which comprises the following steps of: firstly, performing time domain synchronization and Kalman filtering smoothing on multi-source sensor data, and constructing a high-precision synchronization data set; on the basis, the theoretical reference pressure value containing the excitation or swabbing effect is calculated in real time by utilizing the extracted tubular column instantaneous speed and operation modal characteristics and combining a fluid dynamic model. The core lies in that differential calculation is carried out on the theoretical value and actually measured pressure data, and pressure residual decoupling is achieved. The process can dynamically counteract normal physical fluctuation caused by tubular column tripping operation, and the reserved residual sequence is the pure stratum anomaly feature after interference stripping. And finally, a hierarchical control instruction is generated based on the residual sequence, so that the operation efficiency is guaranteed, and meanwhile, the real-time and accurate capture and automatic hierarchical disposal of the secondary well control risk are realized.

The invention belongs to the technical field of petroleum and natural gas exploration and development, and particularly relates to a coiled tubing bottom seal dragging pressure testing and leakage finding packer and a using method thereof, and the pressure testing and leakage finding packer comprises an upper centralizer, a pressure balancing mechanism, a setting packing mechanism and a lower centralizer which are coaxially and sequentially connected in a threaded mode. The pressure balance mechanism comprises a sleeve shell assembly and a pressure relief assembly. A pressure relief opening is formed in the side face of the sleeve shell assembly, and the pressure relief assembly is arranged in the sleeve shell assembly. The setting packing mechanism comprises a central pipe; a rubber sleeve assembly, a slip assembly and a centralizing assembly are sequentially installed on the basis of the center pipe from top to bottom, the rubber sleeve assembly is movably connected with the center pipe in an axial limiting mode, the slip assembly is fixedly connected with the centralizing assembly, and the centralizing assembly is movably connected with the center pipe based on the track pipe groove. According to the technical scheme, pressure bearing reasons and leakage point positions which cannot be found out by dragging pressure testing for multiple times in one-time well entering can be achieved, and it is guaranteed that follow-up fracturing construction operation of the shale gas well is safely and efficiently carried out.

The invention discloses a concentric tube geothermal well structure capable of improving heat exchange efficiency. The concentric tube geothermal well structure comprises a first well opening section and a second well opening section. The first well opening section comprises a first casing pipe, and first well cementation cement is arranged between the inner wall of the first well opening section and the first casing pipe; the second well opening section is provided with a second casing pipe, second well cementation cement and a central casing pipe; a distance is arranged between the second casing pipe and the well wall of the second well opening section, second well cementation cement is arranged between the center casing pipe and the second casing pipe, a water stopping device is arranged at the upper end of the second well cementation cement and is of a reducing structure with the diameter sequentially increased from top to bottom, and the inner wall of the top end of the water stopping device is connected with the center casing pipe. The bottom end of the water stop device is connected with the second sleeve; a packing structure is arranged at the bottom end of the second well cementation cement, and a permeable section is arranged at the lower end of the packing structure. The invention further provides a construction method of the geothermal well structure. The structure is reliable, the heat exchange efficiency is improved, and the industrial long-term operation requirement is met.

The invention provides a safety risk control method for geological storage of carbon dioxide and electronic equipment. A distributed optical fiber sensing system is arranged in at least one injection well of the target sealing and storage area in the axial direction of a shaft and penetrates through a main cover layer and a reservoir; the method comprises the following steps: acquiring background data through a distributed optical fiber sensing system, and establishing a multi-parameter baseline model including a temperature field, a strain field and background noise; temperature, strain and sound wave vibration signals are collected in real time, and key features are extracted; the key features extracted in real time are compared with a preset risk feature library, the types of risk events are identified, and the identified risk events are graded according to the spatial range and intensity of the abnormal signals; and according to the type and the grade of the risk event, generating and executing a corresponding control instruction. According to the embodiment of the invention, the optical fibers are distributed in the whole area along the shaft and the target stratum, a three-dimensional monitoring network covering the sealing body is constructed, and the hysteresis quality of traditional point type measurement and periodic exploration is overcome.

The invention discloses a throttling well killing control method and system, a storage medium and a program product, and relates to the field of intelligent control. According to the application, the control system collects wellhead pressure, casing pressure, throttle valve opening and shaft temperature gradient data; comparing the shaft temperature gradient data with a preset temperature reference curve to obtain a temperature deviation sequence, and performing Fourier decomposition on the temperature deviation sequence to obtain a main frequency component; on the basis of the main frequency component and a preset frequency threshold value, downhole flow situation parameters are determined, and a pressure dynamic compensation function is established according to the downhole flow situation parameters; the wellhead pressure and the casing pressure are input into the pressure dynamic compensation function, and the corrected wellhead pressure and the corrected casing pressure are obtained; and on the basis of the corrected wellhead pressure, the corrected casing pressure and the throttle valve opening, the throttle valve opening adjusting amount is calculated, the throttle valve is controlled to be adjusted according to the throttle valve opening adjusting amount, and therefore the reliability and accuracy of throttle well killing control are improved.

The invention discloses an underwater wellhead angle adjusting tool and a using method thereof.The tool comprises a connecting disc, a connecting cylinder, a hydraulic cylinder and a hydraulic cylinder piston, the connecting cylinder is arranged below the connecting disc, the connecting disc is connected with a high-pressure wellhead feeding tool through bolts, and the high-pressure wellhead feeding tool is connected with a high-pressure wellhead; a hydraulic cylinder shell and a hydraulic cylinder piston of a hydraulic cylinder are arranged on the outer side of the connecting cylinder in a sleeved mode, the hydraulic cylinder piston moves downwards to drive a downward locking lining of the high-pressure well mouth to move downwards, the downward locking lining opens a locking ring of the high-pressure well mouth, and the high-pressure well mouth and the low-pressure well mouth are locked. According to the underwater wellhead angle adjusting tool, an angle-adjustable high-pressure wellhead is vertically installed on an inclined low-pressure wellhead, a hydraulic cylinder piston is controlled to move downwards through hydraulic drive, a downward locking bush is forced to open a locking ring, and the angle-adjustable high-pressure wellhead and the low-pressure wellhead are locked; hydraulic driving is achieved, and operation is easy; and well deviation is reduced, and installation of service tools, blowout preventers and Christmas trees is facilitated.

The invention belongs to the technical field of oil and gas drilling well control equipment, and particularly relates to a ram blowout preventer state confirmation method with a locking indication window, which comprises the following steps: arranging a transparent observation window on a blowout preventer shell, and calibrating the alignment position of the end face of a locking shaft and an inner side reference scribed line; after the locking action is executed, the alignment state is confirmed through multi-angle visual observation; a switchable auxiliary light source is integrated to eliminate visual interference; an industrial camera is used for collecting images, displacement deviation is recognized through an edge detection algorithm, and an alarm is given if the displacement deviation exceeds the limit; and generating an encrypted digital report containing a timestamp and equipment information, uploading the encrypted digital report to a monitoring platform, and supporting real-time check and electronic signature of a mobile terminal. Through three layers of mechanisms of standardized vision-mechanical mapping, optical enhancement and digital perception, high-reliability, high-compatibility and traceable locking state confirmation is realized.

The present disclosure relates to the technical field of petroleum extraction, and disclosed are a forward and reverse circulation combined cementing tool and method, aiming to solve the problem of poor adaptability when using forward or reverse circulation cementing alone. The forward and reverse circulation combined cementing tool comprises a cross-circulation sub (2) and a reverse circulation cementing choke float shoe (3) which are arranged from top to bottom; the reverse circulation cementing choke float shoe (3) comprises a choke assembly (33) and a one-way valve (32), and the choke assembly (33) comprises a control module (332) and a choke module (333). The forward and reverse circulation combined cementing tool and method make full use of the advantages of forward and reverse circulation cementing processes, achieving pressure balance and cement slurry delivery, solving the problems of ultra-long cementing sections and complex formation cementing, greatly improving cementing quality and construction efficiency, and the cementing tool and method are suitable for cementing operations in oil and gas wells under complex geological conditions.

The invention discloses a high-temperature-resistant and high-pressure-resistant autonomous deep well pressure maintaining sampler, and belongs to the technical field of drilling engineering sampling. The sampler comprises an upper joint, a control outer pipe, an end cover, a valve body and a liquid storage chamber which are connected in sequence, an electromagnet is arranged on the outer side of the end cover; an electric control module is arranged in the control outer pipe; a valve element with a permanent magnet is arranged in the valve body in a sliding mode, the valve element is driven to move axially through non-contact electromagnetic force between the electromagnet and the permanent magnet, and opening and closing of the sampling flow channel are achieved. The bottom of the valve core is provided with a valve core inner channel communicated with the sampling flow channel and the liquid storage chamber and a one-way valve; a sampling inlet channel is formed in the joint of the end cover and the valve body. According to the invention, a pure mechanical sealing-based structure is adopted, so that the sealing reliability and the operation stability in a high-temperature and high-pressure environment of a deep well are remarkably improved, drilling fluid is not needed, and efficient and pressure-maintaining sampling of in-situ formation fluid is realized.

The invention belongs to the technical field of petroleum drilling, and particularly relates to a mud scraping disc and a mud scraping device. The mud scraping disc is an elastic spiral mud scraping disc which surrounds the periphery of the drill rod by at least one circle; the mud scraping disc comprises supporting rings and mud scraping rings, and the supporting rings are spirally stacked in sequence; the outer rings of the mud scraping rings are connected with the inner rings of the supporting rings, the inner rings of the mud scraping rings are attached to the peripheral face of the drill rod, the thickness of the mud scraping rings is smaller than that of the supporting rings, and gaps are reserved between the mud scraping rings in the axial direction. The mud scraping disc is used for solving the problems that the mud scraping disc is not thorough in scraping and inconvenient to install. The spiral mud scraping disc surrounds the periphery of the drill rod, the mud scraping disc forms a whole, the supporting rings are arranged in a stacked mode to guarantee that each circle is pressed, the mud scraping rings can be attached to the surface of the drill rod, and therefore the mud scraping disc is not prone to inclining and overturning compared with a split type U-shaped mud scraping disc, and the mud scraping effect is better.

The invention relates to a composite percussion drilling speed increasing tool, and belongs to the technical field of drilling tools. The reciprocating hammering unit comprises a hammer body and an impact hammer, the hammer body is axially and slidably connected into the sleeve, the impact hammer is rotatably connected into the hammer body, a reversing sleeve is rotatably connected into the impact hammer, a reversing cabin is arranged on the reversing sleeve, and a reversing runner hole is formed in the hammer body; the flow channel switch unit comprises a baffle ring arranged on the surface of the hammer body and a transmission mechanism connected between the sleeve and the baffle ring, and the transmission mechanism is used for converting axial motion of the baffle ring into rotary motion so as to open or close the reversing flow channel hole. When the drilling tool is lifted, the axial movement of the baffle ring can be converted into rotary movement, so that the baffle ring rotates relative to the hammer body while axially displacing along with the hammer body, a reversing flow channel hole is shielded, and high-pressure drilling fluid cannot flow into a reversing cabin, so that high-frequency composite impact is stopped, vibration and abrasion caused by idling are avoided, and the service life of the drilling tool is prolonged. And the service life and the safety of the tool are improved.

The invention relates to the technical field of oil production engineering, in particular to a fracturing and plugging method for a chemical flooding injection low-efficiency well of a middle-shallow sandstone thin and poor oil layer. The method comprises the steps that a target fractured well is determined, historical fracturing data and dynamic profile test data of the target fractured well are collected, and a fracturing plugging target layer is determined; according to historical fracturing data analysis and an ASP flooding core blockage rule experiment, the fracture radius of a target layer, the ASP flooding reservoir blockage radius, the reservoir physical property and fracturing scheme of the target layer, the lower limit of the quality-divided injection permeability of the target layer and the damage degree caused by fracturing residues of the target layer are obtained; the method comprises the following steps: sequentially acquiring the dosage of a blocking remover for chemical blocking removal of a target layer, slug combination parameters, fracture parameters of a fractured position, a post-fracturing quality-divided injection process and post-fracturing injection mode combination, performing fracturing blocking removal on the target layer according to the acquired data, and collecting fracturing blocking removal effect data in real time. According to the method, the operation efficiency is improved, and meanwhile the construction cost is reduced.

The present disclosure provides embodiments of a monobore assembly to be positioned in a hydraulic fracturing manifold system to provide overpressure relief and bleed using choke valves. The monobore assembly includes a control module, a pressure relief choke valve, a pressure transducer, and a bleed choke valve. The control module has a controller configured to receive a pressure signal, from the pressure transducer, and upon determination the pressure is above a predetermined threshold, send an output action to relieve the pressure in a throughbore of the monobore assembly. The pressure relief choke valve is configured to receive the output action and open in less than 0.4 seconds, thereby to prevent damage from overpressure within a throughbore of a first monobore junction. The bleed choke valve is also configured to receive the output action to controllably evacuate pressure, or pressurized fluid, within a throughbore of a second monobore junction.

The invention discloses a brine well wall anti-collapse structure and a construction method and application thereof. The brine well wall anti-collapse structure comprises a supporting disc cavity, a grouting blocking device and a supporting disc pouring body. The grouting blocker is a soft bag and is filled with a first grouting material so as to expand and block the opening of the cavity of the supporting disc; and the branch plate pouring body is formed by injecting second grouting material into the branch plate cavity, and is used for filling the branch plate cavity and plugging a gap between the grouting barrier device and the branch plate cavity. According to the invention, a composite grouting process system of branch plate grouting and high-pressure jet grouting is innovatively developed; a supporting disc structure is formed in a sand layer through expansion and extrusion, then an anti-seepage grouting material is injected through a grouting blocking device to form a sand prevention supporting layer, then a gap between a supporting disc and the grouting blocking device is recharged and solidified through a high-pressure rotary jet grouting technology, and finally a well wall overall reinforcing body formed by mutually meshing and connecting the grouting blocking device and the supporting disc structure is constructed. The problems that an existing brine well faces fine sand silting wells, soft soil layer frameworks are dissolved and collapsed and the like are solved.