22results about How to "Improve cementing quality" patented technology

The invention discloses a controllable reaming casing centralizer for a well and a related method. The casing centralizer comprises a centralizer body, a binding rope and a locking device, the centralizer body comprises a first shroud ring, a second shroud ring, a first bow piece and a plurality of second bow pieces; the first bow piece and the second bow pieces are evenly distributed between the first hoop ring and the second hoop ring in the circumferential direction. The middle portions of the first bow piece and the second bow pieces are bent inwards to form bent portions, the locking device is fixed to the inner side of the first bow piece, the binding rope penetrates through the locking device, a through hole is formed in the middle of the first bow piece, and the binding rope penetrates out of the inner side of the first bow piece through the through hole and is bound to the bent portions of the first bow piece and the second bow pieces. The locking device can be unlocked so as to release the binding rope; the casing centralizer improves the centering effect and the well cementation quality of a reaming section casing, solves the problem that a pipe string is difficult to descend, and is simple in structure, low in machining cost, convenient to popularize and apply on a large scale and beneficial to improving economic benefits.

The invention provides an elastic centralizer which comprises a first connecting cylinder, a second connecting cylinder and a plurality of centralizing ribs, the top ends of the centralizing ribs are connected with the first connecting cylinder, the bottom ends of the centralizing ribs are connected with the second connecting cylinder, the first connecting cylinder and the second connecting cylinder are arranged on the outer wall of a sleeve in a sleeving mode, and the centralizing ribs are made of fiber resin composite materials. And the sleeve extends in an arc form in the direction far away from the sleeve. According to the elastic centralizer, the contact area of the centralizing ribs and the well wall is in a proper range, large supporting force can be provided, stress is not concentrated, meanwhile, the centralizing ribs have good elastic reset capacity, when the centralizing ribs are subjected to local pressure, the centralizing ribs are not prone to plastic deformation, and therefore centering running of a casing cannot be affected.

The invention discloses a pressure control well cementation system and method. The system comprises an automatic throttling unit, an automatic slurry supplementing and pressurizing unit and a control center. Wherein the automatic throttling unit is used for being arranged between a well mouth and a mud tank so as to control the back pressure of the well mouth by adjusting the valve opening degree of the throttling valve; the automatic slurry supplementing and pressurizing unit is used for being communicated with a connecting pipeline between a well mouth and the automatic throttling unit so as to control well mouth back pressure by compensating fluid flow for the system. The control center is used for controlling the automatic throttling unit to adjust the valve opening degree of the throttling valve and / or controlling the automatic slurry supplementing and pressurizing unit to adjust the output fluid flow so as to control the back pressure of the wellhead based on the target fluid parameters of the wellhead and the parameter deviation of the corresponding actually-measured fluid parameters. The fluid parameters comprise pressure or fluid flow, and the actually-measured fluid parameters comprise actually-measured pressure of one end, close to the wellhead, of a throttling valve of the automatic throttling unit or actually-measured fluid flow of the output end of the automatic throttling unit. And pressure control in the whole well cementation process can be achieved.

The application discloses a salt-resistant water-non-dispersible material for oil well cement and a preparation method thereof. The salt-resistant water-non-dispersible material for oil well cement comprises the following components in the form of weight parts: 100 parts of N,N-dimethyl acrylamide, 3-6 parts of acrylic acid, 10-20 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5-15 parts of a cyclic monomer, 0.1-0.4 parts of a branching agent, 5-15 parts of a cationic monomer, 0.3-3 parts of a crosslinking agent and 400-500 parts of water. The salt-resistant water-non-dispersible material prepared by the application has good salt resistance, can significantly improve the anti-dispersion performance of the cement slurry when used in a salt water and sea water cement slurry system with a NaCl content of 18 wt% or less, and has excellent rheological performance.

This invention belongs to the technical field of cementing devices, specifically relating to a foamed cement slurry cementing device. It aims to solve the problem of uneven foam distribution within the foamed cement slurry that ultimately settles on the wellbore, reducing cementing quality. The invention includes a reinforcement pipe, a delivery pipe, an external wellbore base, a return assembly, a drive assembly, and an injection head. This invention can introduce foamed cement slurry from well sections with higher foam content back into well sections with lower foam content for circulation, thereby ensuring the uniformity of foam distribution and size within the foamed cement slurry during its flow through the delivery pipe and return cavity, thus improving cementing quality.

The application provides a kind of test device and method for evaluating volume change rate of cement slurry in cementing waiting-on-phase, and belongs to the technical field of oil and gas well cementing engineering.The test device comprises a curing kettle body, a cement slurry cup is arranged in the curing kettle body, a supporting assembly is used to suspend the cement slurry cup in the curing kettle body, and an adjusting assembly is used to assist in taking the cement slurry cup.The cement slurry cup can be suspended by the supporting assembly and the adjusting assembly, the remaining space in the curing kettle body forms a continuous flow cavity, which is beneficial to simulate temperature conditions and pressure environment closer to the actual downhole environment, the cement slurry cup can be easily taken out or put into the curing kettle body without the help of additional tools, the operation time is saved, the liquid medium in the cement slurry cup can be easily emptied, and the subsequent processing work after the test is completed is simplified.

The present application belongs to the technical field of drilling, and particularly relates to a hydraulic casing centralizer and a use method thereof. The hydraulic casing centralizer comprises an upper joint and a lower joint. A sliding assembly is slidably connected in the upper joint. An operating plate is connected to one end of the sliding assembly facing the lower joint. A centralizing arm is hingedly connected to one end of the lower joint facing the upper joint. The wedge shape on the operating plate matches the wedge shape on the centralizing arm. A hydraulic separation device and a flow channel are arranged on the sliding assembly. Liquid flows into the space between the sliding assembly and the upper joint through the flow channel. The hydraulic separation device drives the operating plate to move towards the centralizing arm according to the pressure setting value. A limiting assembly is arranged between the sliding assembly and the upper joint to limit the position of the operating plate after movement. The operating plate drives the centralizing arm to rotate and support the well wall by using the wedge shape matching the centralizing arm. The centralizer forces the casing string to be centered in the wellbore, thereby improving the cementing quality.

The utility model discloses a reinforced well cementation casing centralizer tool, the main body structure adopts the seamless steel pipe of spring steel, after cutting, the integral main body structure of further processing is formed after the integral processing, the upper sleeve and the lower sleeve of accommodating and sleeving in casing are located in the upper and lower both ends, and the multiple centralizing ribs of longitudinal arrangement between the upper sleeve and the lower sleeve and in the middle part, multiple centralizing ribs are arranged on the outer peripheral surface of upper sleeve and lower sleeve along the circumferential direction of upper sleeve and lower sleeve and are integrally formed connection with upper sleeve and lower sleeve, and the centralizing rib is outwardly inclined from the upper and lower both ends to the axis of casing, and a stress groove is arranged in the middle position of each centralizing rib to increase the reset force after deformation, and the fluid flow channel is formed between the adjacent two centralizing ribs, and the brush is fixed on the outside of upper sleeve and lower sleeve, and the brush is in contact with the well wall to destroy and remove the well wall mud cake. The application can ensure that the casing can smoothly enter the well, and improve the well cementation quality.

The invention relates to the technical field of oil and gas well drilling and completion, in particular to a pressure control method for well cementation operation, a sealing device and application of the sealing device, and the pressure control method comprises the steps that in the well cementation operation process, whether overflow occurs or not is judged; if yes, the shut-in casing pressure is calculated; the equivalent mud density or the equivalent completion fluid density for balancing the formation pressure is calculated according to the shut-in casing pressure, and the needed equivalent wellhead return pressure is calculated; annular sealing of the wellhead is kept, and the equivalent wellhead return pressure obtained through calculation in the above step is maintained at the wellhead by controlling the opening degree of a throttling valve; and the slurry density or the well completion fluid density is gradually increased, the opening degree of the throttling valve is correspondingly controlled, and the well cementation operation process continues. By means of the pressure control method, the sealing device and the application of the pressure control method, the sealing device and the sealing device, the annulus pressure profile of a shaft can be controlled in the well cementation operation, manual intervention on downhole pressure abnormity in multiple links such as casing running and well cementation can be achieved, the well control risk of the well cementation operation is greatly improved, and the well cementation operation quality is improved.

The application discloses a high-temperature-resistant expanded fiber resin plugging material and a preparation method and application thereof in leakage prevention and plugging of well cement slurry. The preparation method of the high-temperature-resistant expanded fiber resin plugging material comprises the following steps: S1, adding sodium hydroxide into an acrylic acid solution, and then adding a chitosan solution, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and fibers into the acrylic acid solution in sequence; and then adding an initiator and a crosslinking agent into the acrylic acid solution in sequence, and obtaining a polymer gel through polymerization; the chitosan solution adopts glacial acetic acid solution as a solvent; and the polymer gel is dried and then crushed to obtain a granular resin. Through use of the high-temperature-resistant expanded fiber resin plugging material, the problem of cement slurry leakage in a fractured formation can be effectively solved, the treatment time and cost of cement slurry leakage in the fractured formation are greatly reduced, and the cementing quality of the fractured formation is improved, thereby opening up a new way for solving the problem of cement slurry leakage in the fractured formation.

The invention provides high-density cement paste as well as a preparation method and application thereof. The high-density cement paste disclosed by the invention is prepared from the following components in parts by mass: 2 to 4 parts of dispersing agent PC-F45L, 1.2 to 1.5 parts of retarder PC-H40L, 5.5 to 6 parts of fluid loss agent PC-G80L, 0.5 to 1 part of defoaming agent, 38 to 42 parts of weighting agent, 98 to 102 parts of cement and 220 to 246 parts of water. The dispersing agent, the retarder and the fluid loss agent are specifically selected and compounded with other components, so that the obtained high-density cement paste cannot be thickened too early (the thickening time exceeds 400 minutes) in the grouting process, has better strength, sedimentation stability, rheological property and filtration loss property, and can well improve the well cementation quality.

A cementing isolation fluid composition comprises the following components, measured by mass and weight: 100 parts of water; 30-50 parts of an intelligent responsive amphiphilic block copolymer; 5-10 parts of modified nanocellulose; 2-5 parts of a bifunctional crosslinking agent; 10-15 parts of an environmentally friendly surfactant; 100-200 parts of a nanocomposite weighting agent; and 1-3 parts of a slow-release antioxidant. Through the synergistic effect of the intelligent responsive amphiphilic block copolymer and the modified nanocellulose, the isolation fluid can still maintain good rheological properties under the conditions of 200°C and 100MPa, and the apparent viscosity reduction is less than 20%. The PNIPAM block provides temperature responsiveness, the PDEAEMA block provides pH responsiveness, and the PSS block provides salinity responsiveness, so that the isolation fluid can adaptively adjust its structure and performance according to the downhole environment.

This invention discloses a tailpipe cementing annulus pressure-holding tool and its usage method, belonging to the field of tailpipe cementing technology. The tailpipe cementing annulus pressure-holding tool includes: an upper connector, a valve control unit, a valve plate, a valve seat, and a lower connector; the upper connector and the lower connector are fixedly connected; the valve control unit is slidably disposed inside the upper connector and the lower connector, and the valve control unit abuts against the upper connector and the lower connector respectively; one end of the valve control unit abuts against one side wall of the valve plate; the valve plate is rotatably connected to the valve seat; the valve seat is sleeved inside the lower connector, and the outer wall of the valve seat abuts against the inner wall of the lower connector; the valve seat is tubular, with two V-shaped grooves symmetrical about the center of the valve seat on its side wall. The tailpipe cementing annulus pressure-holding tool of this invention has a simple structure, reliable function, and is applicable to tailpipe cementing operations of most casing types, effectively improving cementing quality.

This invention discloses a cement sheath micro-gap pressure testing device, method, data, medium, and application, relating to the field of oil and gas well sealing technology. It includes an outer casing and an inner casing, with the outer casing fitted over the outer side of the inner casing, forming an annular cavity between them; a sealing element that seals the inner cavity of the inner casing; a pressure injection system connected to the inner cavity of the inner casing; a pressure control system connected to the pressure injection system; an acoustic logging tool housed within the inner cavity of the inner casing; a logging control system connected to the acoustic logging tool; a micro-gap size acquisition system; and a data association system. This invention can simulate the generation and evolution process of cement sheath micro-gap under varying downhole pressure conditions, establish a calibration relationship between acoustic response and micro-gap state, and provide experimental basis for evaluating cement sheath sealing integrity and optimizing cementing quality.

The application discloses a casing centralizer for controllable reaming well and a related method. The casing centralizer comprises a centralizer body, a binding rope and a locking device. The centralizer body comprises a first hoop ring, a second hoop ring, a first bow piece and a plurality of second bow pieces. The first bow piece and the plurality of second bow pieces are uniformly distributed between the first hoop ring and the second hoop ring in a circumferential direction. The middle part of the first bow piece and the second bow piece is inwardly bent to form a bent part. The locking device is fixed to the inner side of the first bow piece. The binding rope passes through the locking device. The middle part of the first bow piece is provided with a through hole. The binding rope passes through the through hole from the inner side of the first bow piece and is bound to the bent part of the first bow piece and the plurality of second bow pieces. The locking device can be unlocked to release the binding rope. The casing centralizer improves the centering effect of the casing in the reaming section and the cementing quality, solves the problem of difficult pipe string running in, has a simple structure, low processing cost, is convenient for large-scale popularization and application, and is favorable for improving economic benefits.

The invention relates to a deepwater and ultra-deepwater well cementation multifunctional vibration guiding shoe which comprises a radial vibration module and a rotor module, the radial vibration module comprises a stator core shaft, rupture disk assemblies and a rotor assembly, the stator core shaft is of a hollow cylindrical structure with the two ends open, and the rupture disk assemblies are arranged in an inner cavity of the stator core shaft at intervals; the rotor assembly is arranged on the outer wall of the stator core shaft in a sleeving mode, and the stator core shaft is provided with a plurality of flow channels which are in fluid conduction connection with the rotor assembly. The rotary drum is arranged on the outer wall of the stator core shaft in a sleeving mode and located outside the rotor assembly, and the eccentric guide shoe is assembled on the rotary drum and located at the downstream end of the stator core shaft; the axial vibration module comprises an eccentric block, the eccentric block is arranged in the eccentric guide shoe, and an eccentric hole is formed in the eccentric guide shoe. The device can effectively improve the well cementation operation efficiency and quality, and is suitable for well cementation construction under various complex working conditions.

The present invention discloses a composite cyclone hydraulic straightener, comprising a coupling, a center tube, a roller rotary straightener, a straightening sleeve, a hydraulic device, a back-off ring, a hydraulic variable diameter straightener, a conical ring platform, and a lower joint. The right end of the coupling is connected to the left end of the center tube. The roller rotary straightener, the straightening sleeve, the hydraulic device, the back-off ring, the hydraulic variable diameter straightener, and the conical ring platform are sequentially and adjacently sleeved on the center tube. The right end of the center tube is connected to the left end of the lower joint. The roller rotary straightener comprises a ball hole, a cyclone blade, and a ball. The hydraulic device comprises a cylinder, a piston, and a pressure transmission hole. The hydraulic variable diameter straightener comprises a floating seat, a straightening bar, and a fixed seat. The present invention can not only effectively solve the problems of high entry resistance and poor applicability of the existing straightener to irregular wellbore diameters, but also assist in removing residual rock cuttings and dead slurry from the well wall during drilling and cementing operations.

The invention provides a cement paste system capable of self-healing when meeting carbon dioxide for well cementation as well as a preparation method and application of the cement paste system. The cement paste system comprises oil well cement, a carbon dioxide self-healing agent, silicon dioxide, an anticorrosive agent and water, as the carbon dioxide self-healing agent is added into a cement paste system, when a cement sheath has micro-cracks or micro-gaps and carbon dioxide fluid channeling is generated, the carbon dioxide self-healing agent expands in volume under the stimulation action of carbon dioxide, and the micro-cracks or micro-gaps are automatically blocked, so that the purposes of inhibiting carbon dioxide fluid channeling and preventing carbon dioxide fluid channeling are achieved. The effect that the cement sheath continuously has excellent packing performance is ensured; and meanwhile, the carbon dioxide self-healing agent has good compatibility in a cement slurry system, so that the finally obtained cement slurry system has excellent corrosion resistance, self-healing property, toughness and channeling resistance, is suitable for a temperature interval of 30-100 DEG C, and can be used for well cementation of carbon flooding and burying.

The invention belongs to the technical field of cement paste preparation, and particularly relates to a marine emergency abandoned well cement paste system and a preparation method thereof. The offshore emergency abandoned well cement slurry system comprises oil well cement, a reinforcing agent, a fluid loss agent, an anti-dispersing agent, a retarder, an anti-channeling agent, a thixotropic agent, a plugging agent, a defoaming agent and fresh water. The offshore emergency abandoned well cement slurry system has the following advantages that the system is not dispersed when encountering other fluids, and erosion and dilution of wellbore and formation fluids are effectively resisted; precise thickening can be achieved, and the requirements of complex well conditions are met; the cement mortar has the advantages of short transition time, high strength, compactness, no pore, good cementation quality with a wall surface, good anti-channeling effect, capability of plugging a 0.75 mm crack (the forward pressure difference is greater than or equal to 7MPa), and strong leakage prevention and plugging capability.

This utility model relates to the field of cement injection equipment technology, and discloses an adjustable rotary staged cement injection equipment, including an inlet pipe, a fixed pipe, a rotating pipe, a rotating connecting pipe, a drive integrated device, an auxiliary drive device, a curved metal pressure pipe, and a mud injection pipe integrated device. One end of the inlet pipe is connected to the cement tank, and the other end of the inlet pipe is connected to the top of the fixed pipe. The bottom end of the fixed pipe is connected to the top of the rotating pipe through the rotating connecting pipe. The drive integrated device is fixedly connected to the outer circumference of the fixed pipe, and the drive end of the drive integrated device is connected to the rotating pipe. The bottom end of the rotating pipe is connected to the top of the mud injection pipe integrated device through the curved metal pressure pipe. The outer circumference of the rotating pipe is connected to the auxiliary drive device, and the drive end of the auxiliary drive device is connected to the mud injection pipe integrated device. This utility model uses the drive integrated device to drive the rotating pipe to rotate, and the auxiliary drive device to adjust the mud injection pipe integrated device, to achieve uniform cement injection.

This invention relates to a combined tool for extended reach casing and cementing. A float collar, a bypass valve, and an oscillating device are sequentially screwed onto the top of the power guide shoe. The oscillating device's oscillating shaft, from top to bottom, comprises an upper connector, a hexagonal tenon, a polished rod section, and a threaded section. A spring sleeve is screwed onto the upper part of the threaded section of the oscillating shaft. Disc springs are stacked above the spring sleeves, each disc spring fitting around the outer circumference of the polished rod section. A spring plug is pressed above the disc springs, and a hexagonal hole is provided along the axis of the spring plug, fitting onto the hexagonal tenon. A spring cylinder is screwed onto the lower outer circumference of the spring plug. The inner cavity of the spring cylinder has an inner step, located below the threaded section and spaced at intervals. An oscillator is installed below the inner step, its bottom abutting against the top of the lower connector. The upper external thread of the oscillating lower connector is screwed into the lower port of the spring cylinder. This tool can generate self-excited vibration, reducing friction, increasing casing running speed, and improving cement stone strength and cementing quality.

The invention relates to an alkali-resistant glass fiber water dispersible chopped yarn and a production method thereof, and the alkali-resistant glass fiber water dispersible chopped yarn comprises the following components: 58-65% of SiO2; 13.5%-17.5% of ZrO2 (zirconium oxide); 4.5 to 7 percent of CaO; the content of NaO2 is 11.5 to 14.5 percent; 0.5% to 2.5% of K2O; al2O3, less than or equal to 0.5%; less than or equal to 0.3% of Fe2O3; the balance is impurities; a tank furnace method is adopted for production, and alkali-resistant glass fiber yarn with the diameter of 7-15 micrometers is manufactured after high-temperature melting; in the drawing process, the precursor is coated with a water dispersible impregnating compound, and after natural conditioning, the precursor is chopped into chopped yarns with the length of 3-36 mm; the water-dispersible impregnating compound is a polymer emulsion composed of an emulsifier, a penetrant, a surfactant, a metal oxide, a dispersant and water. The anti-leakage cement paste is used in a well cementation cement paste system and cement concrete, so that the stress concentration of internal defects of formed set cement is reduced, the impact resistance is improved, the effects of preventing leakage and prolonging the service life are achieved, and the quality of well cementation and the quality of the concrete are effectively improved.