117 results about "Cement sheath" patented technology

The invention provides a monitoring system and a monitoring method for a micro annular space of an underground cement sheath. The monitoring system comprises a reaction kettle, a first injection device, a second injection device, a third injection device and a monitoring assembly, the interior of the reaction kettle is divided into a confining pressure cavity, a second annular cavity and a first annular cavity, the second annular cavity is arranged around the peripheral side of the first annular cavity, and the confining pressure cavity is arranged around the peripheral side of the second annular cavity. First liquid is injected into the first annular cavity through the first injection device to simulate the temperature and pressure in the casing pipe. Third liquid is injected into the confining pressure cavity through a third injection device, and the temperature and pressure in the stratum are simulated. And cement paste is injected into the second annular cavity through the second injection device to form a cement sheath. And the temperature information and the sound wave information of the cement sheath are monitored through the monitoring assembly, so that the expansion behavior of the micro annular space in the cement sheath in the low-temperature carbon dioxide injection process can be obtained.

The invention is suitable for the field of casing sidetrack drilling operation, and provides an elastic piece prizing type side pushing mechanism for a cement sheath knapper, the elastic piece prizing type side pushing mechanism comprises a first fixing rod, a second fixing rod, an inserting rod, an elastic piece and a movable roller shell, the elastic piece is bent to jack the movable roller shell to do lateral movement, extrusion force is applied to a casing to induce cracking of a cement sheath, and the elastic piece prizing type side pushing mechanism is suitable for the cement sheath knapper. An elastic piece prizing type lateral pushing structure is adopted, an independent driving cavity, a sealing assembly and a guiding structure do not need to be arranged, the structure of the mechanism is greatly simplified, the overall outer diameter size is reduced, miniaturization and compactness of the mechanism are achieved, the mechanism meets the tripping-in requirements of small well diameters, thin-wall sleeves and complex well conditions, meanwhile, lateral extrusion is achieved through elastic deformation of an elastic piece, and the service life of the mechanism is prolonged. Stable extrusion force is guaranteed, and the defects that an existing piston driving structure is complex and large in size are overcome.

The invention discloses a device for testing the sealing performance of a full-size sleeve-cement sheath-stratum combination of a hydrogen storage bank. Relates to the technical field of petroleum and natural gas drilling and production engineering, and is characterized in that the device comprises a sleeve-cement sheath-simulated stratum maintenance device for preparing the simulated stratum, an alternating load applying device and a sealing performance testing device; the method comprises the following steps: preparing a full-size simulated stratum through a maintenance device, constructing a'sleeve-cement sheath-simulated stratum 'integrated assembly by taking the full-size simulated stratum as a carrier, completing maintenance, and detecting the sealing integrity of the cement sheath after simulating the actual underground working condition; the simulation stratum capable of being used for testing the sealing performance of the cement sheath is prepared, the full-size simulation stratum serves as a core testing carrier, and quantitative evaluation of the sealing performance of the full-size cement sheath is achieved.

The invention belongs to the technical field of oil well windowing, and discloses a double-layer casing windowing sidetrack drilling test device and test method. The double-layer casing windowing sidetrack drilling test device comprises an inner-layer casing, an outer-layer casing, a filler, a guide piece and a drilling piece, the outer-layer casing is arranged outside the inner-layer casing in a sleeving mode, and an oil well with the double-layer casing can be simulated; the filling space between the inner-layer sleeve and the outer-layer sleeve can be filled with the filling material, and the filling material is used for simulating a cement sheath in actual construction; the guide piece fixed in the inner hole of the inner-layer sleeve is used for simulating a whipstock; a drilling part used for simulating a milling cone can move to be in contact with the guiding inclined face of the guiding part and move to be in contact with an inner-layer sleeve, a filling material or an outer-layer sleeve under the guiding of the guiding inclined face, the drilling part can mill the inner-layer sleeve, the filling material or the outer-layer sleeve through rotation so as to open windows and drill holes in the inner-layer sleeve, the filling material and the outer-layer sleeve, and the inner-layer sleeve, the filling material and the outer-layer sleeve can be driven by the drilling part to rotate. Double-layer casing windowing sidetrack drilling is simulated on the ground, and the success rate of actual windowing sidetrack drilling is increased.

This invention discloses a method for reliability analysis of cement sheath quality in coiled tubing drilling, relating to the field of construction technology. The steps of this invention are as follows: S1: Identify the damage forms and characteristics of the cement sheath; S2: Test the impact of cement sheath loss on the external load of the casing; S3: Test the casing performance using different parameters; S4: Calculate the external load and strength data of the casing; S5: Calculate reliability data, test the failure morphology of the cement sheath after fracturing under high-pressure formation fluid and fracturing conditions, test the sealing integrity of the perforated section under fracturing operation conditions, and observe the cement sheath crack propagation morphology and microcrack propagation characteristics around the perforation channel using CT scanning. This invention, through method improvements, facilitates the visual observation of cement sheath failure morphology; evaluates the cement sheath sealing performance under different operating conditions; and analyzes the impact of different cement sheath damage degrees on the casing stress state.

This invention discloses a core-shell structure oil absorbent for cementing under oil-based drilling fluid conditions and its preparation method. The oil absorbent comprises the following components in parts by weight: 20-25 parts ester monomers, 3-7 parts modified composite materials, 1-5 parts dispersant, 20-25 parts pore-forming agent, 0.5-0.8 parts crosslinking agent, 1.3-1.5 parts initiator, and 50-70 parts water. The oil absorbent of this invention expands after absorbing oil and possesses a certain rigidity, compensating for defects without causing a decrease in the mechanical properties of the cement stone. Furthermore, the addition of this oil absorbent allows the cement stone to meet the low elasticity requirements under multi-stage fracturing conditions, enhancing the elasticity of the cement stone and improving the long-term sealing performance of the cement sheath.

The application relates to a device and a method for testing the bonding strength between a casing and well cement by using rotary torque, and belongs to the technical field of drilling material detection. The device comprises a test sample, a slip, a joint and a load applying device. Power is generated by a power device of a rotary dynamic torque tester to form rotary output, which drives a wellbore simulation casing to rotate. The wellbore simulation casing and a cement sheath fixed on a cementing cylinder are relatively displaced to form rotary torque. A torsion meter reads and records the torsion value when the cementing interface is damaged in real time, and the maximum value of the torsion value is taken as an index for representing the cementing strength. The device disclosed by the application is simple and convenient to operate, simple in structure, low in cost and reusable, and can be widely applied to the measurement and evaluation of the cementing performance of casings and well cement of different wellbore sizes.

The application discloses a temperature calculation method for a multilayer casing cement sheath structure, which comprises the following steps: discretizing a radial heat conduction differential equation in a cylindrical coordinate by using a difference method to calculate the temperature of non-boundary points and non-interface points of a wellbore; calculating the temperature of boundary points and interface points based on the boundary conditions and the temperature and heat flux density continuous conditions of any structure interface; and calculating the radial temperature from the center of the wellbore to the outer boundary of a stratum by using a linear equation group obtained by discretizing the heat conduction differential equation in the cylindrical coordinate and the boundary conditions of the radial temperature of the multilayer structure of the wellbore. According to the structural parameters of the wellbore, the thermal physical property parameters of materials and the boundary temperature parameters, the application can accurately calculate the temperature of the multilayer casing cement sheath structure, solves the radial temperature transmission problem under different structures according to the thermal continuous boundary conditions of different structure contact surfaces, and provides a theoretical basis for the temperature transmission problem of the multilayer structure since the calculation method is accurate and efficient.

The invention provides an oil field well casing residual strength evaluation method and system based on numerical simulation, and relates to the technical field of oil field development casing safety evaluation. Based on the casing damage evaluation basic data of the target oil field block, establishing a block scale fluid-solid coupling numerical model reflecting an injection-production dynamic and formation mechanical response coupling relationship, and obtaining redistributed crustal stress field data around a shaft; redistributed crustal stress field data are used as boundary conditions, a three-dimensional coupling mechanical model containing a stratum, a cement sheath and a casing pipe is established in combination with the casing pipe structure and material parameters, and the stress distribution and the maximum equivalent stress of the casing pipe under the injection-production load effect are obtained through numerical simulation; and based on the maximum equivalent stress and the yield strength of the casing material, performing residual strength evaluation and damage risk grading on the casing according to the strength utilization rate and the residual strength coefficient. Therefore, the accuracy and the dynamic prediction capability of the residual strength evaluation of the oil field casing are improved, and a scientific decision basis is provided for casing damage treatment.

The invention relates to the technical field of corrosion resistance of CCUS well cementation cement sheaths, in particular to a tertiary amine modified CCUS corrosion-resistant admixture as well as a preparation method and application thereof. And uniformly mixing the epoxy resin emulsion with the tertiary amine modified curing agent for reaction to obtain the tertiary amine modified CCUS corrosion-resistant admixture. The tertiary amine modified CCUS corrosion-resistant cement admixture system is prepared from the tertiary amine modified CCUS corrosion-resistant admixture, a fluid loss agent, a coagulation accelerator and a defoaming agent. The CCUS corrosion resistance of a cement matrix is improved by adding a tertiary amine modified CCUS corrosion-resistant cement admixture system into oil well cement. The tertiary amine modified CCUS corrosion-resistant cement system provided by the invention has excellent corrosion resistance, a composite corrosion-resistant structure is constructed through cooperation of a polymer film structure and tertiary amine group carbon adsorption, and the corrosion resistance of a cement matrix is remarkably improved.

A comprehensive safety evaluation method, system, equipment, and storage medium for gas storage injection and production wells includes the following steps: S1, calculating the effective internal and external pressures, remaining internal pressure resistance, and external extrusion resistance of the gas storage injection and production well casing to evaluate the remaining strength of the casing; S2, calculating the failure probability of the gas storage injection and production well casing and cement sheath, generating curves showing the variation of casing failure probability with service life and cement sheath failure probability with formation pressure to measure the reliability of the gas storage injection and production wells; S3, predicting the failure probability of gas storage injection and production wells by reading and learning failure probability prediction sample data; S4, calculating and generating curves showing the variation of corrosion rate of gas storage injection and production wells with service life to predict the remaining life of the gas storage injection and production wells, using the prediction results to control the service life of the gas storage injection and production well casing, and providing a decision-making basis for whether to seal or modify the gas storage well.

The present application belongs to the field of oilfield drilling fluid, and discloses a multifunctional polymer drilling fluid mud cake modifier, a preparation method and application thereof, wherein the mud cake modifier comprises, by mass fraction, 5-95% of acicular wollastonite powder, 1-20% of sodium gluconate and 1-10% of instant sodium carbonate; the mud cake modifier is directly added into drilling fluid during use, and the addition amount is 0.5-1.5% by mass fraction. The mud cake modifier can improve the hardness, compactness and toughness of the mud cake, and improve the properties of the mud cake on the well wall; the mud cake modifier can form a thin, hard, tough and compact mud cake on the well wall, reduce the filtration loss of the drilling fluid, improve the rheological property of the drilling fluid, has no obvious influence on the density and viscosity of the drilling fluid, and has the dual functions of enhancing the affinity between the cement sheath and the mud cake and stabilizing the well wall.

The invention provides a cement sheath thickness measurement method, device and equipment and a storage medium, and belongs to the field of applied geophysics and oil-gas exploration, and the measurement method comprises the steps: obtaining full-wave waveform data of a Lamb wave received at different orientations at a certain depth point in a target depth interval; performing waveform processing on the full-wave waveform data of the Lamb wave received at different orientations of the depth point, and determining corresponding group delays of the depth point at different orientations; based on the group delays corresponding to the depth point in different orientations, circumferential cement sheath thicknesses corresponding to the depth point in different orientations are determined; and repeatedly executing the steps until the circumferential cement sheath thickness corresponding to each depth point of the target depth interval in different directions is obtained. Through the method provided by the invention, accurate calculation of the thickness of the cement sheath between the casing and the stratum can be simply and quickly realized, and the well cementation quality can be accurately evaluated.

The application discloses a horizontal well section interval optimization method based on cement ring integrity dynamic constraint, and belongs to the technical field of unconventional oil and gas development engineering. The method constructs a non-uniform cementing mechanics model based on a casing eccentricity to lock a stress target, activates a transient fluid-solid coupling mechanism to solve an expansion load, and extracts a spatial stress disturbance scalar. Nonlinear fatigue evolution under alternating load is tracked, and a double-mode safety tolerance limit that locks the body damage and interface anti-channeling is constructed. Finally, the optimal section interval is output by taking the rigid constraint as the driving force for multi-objective optimization. The application optimizes the yield target and wellbore integrity, accurately avoids hidden engineering risks such as annular pressure from the source, and maximizes the comprehensive development benefit of a single well.

The application provides a cementing slurry and a preparation method and application thereof, the cementing slurry comprises oil well cement, active material, hollow glass microspheres, corrosion-resistant material, tough material, suspending agent, dispersing agent, fluid loss additive, retarder, defoaming agent and water; the density of the cementing slurry is 1.2-1.6 g / cm 3 . The preparation method comprises the following steps: (1) mixing oil well cement, active material, hollow glass microspheres, corrosion-resistant material, tough material, suspending agent, dispersing agent and fluid loss additive to obtain dry mixture; (2) mixing retarder, defoaming agent and water to obtain wet mixed agent water; and (3) mixing the dry mixture and the wet mixed agent water to obtain the cementing slurry. The cementing slurry provided by the application realizes high-quality and rapid well building, guarantees long-term sealing integrity of the cement sheath, and provides strong technical support for large-scale exploration and development of high-sulfur natural gas wells and CCUS wells and reduction of wellhead gas channeling and annular pressure bearing risk.

The invention discloses an interface fluid channeling simulation test device and method considering perforation initial damage, and belongs to the technical field of oil and gas exploitation, and the interface fluid channeling simulation test device considering perforation initial damage comprises an inner cylinder assembly, an outer cylinder assembly, a cement sheath body, a container assembly and a perforating gun. The simulation casing pipe and the simulation rock which are matched with the casing pipe component and the rock component in size are designed to form the inner cylinder assembly and the outer cylinder assembly so as to achieve simulation of the shaft structure, and the cement sheath body and the perforating gun are arranged in the filling interval between the inner cylinder assembly and the outer cylinder assembly so as to achieve simulation of the shaft structure. Construction of the test device in an initial damage environment can be achieved, simulation of shaft hydraulic pressure can be achieved by simulating injection of liquid in a first injection interval in a casing pipe based on the constructed test device, and fluid is injected into a first interface, a second interface and a second injection interval through a container assembly. Therefore, the interface fluid channeling simulation test considering the initial damage of the perforation is completed.

The invention discloses a multifunctional high-temperature-resistant strength recession agent for oil well cement and a preparation method thereof, and the recession agent comprises the following components in parts by mass: 75-85 parts of a high-temperature reinforcing agent A, 8-12 parts of a nano anti-permeability preservative B and 8-12 parts of a high-temperature expanding agent C. The high-temperature reinforcing agent A comprises silicon powder compounds with different granularities, the nano anti-permeability preservative B is white carbon black, and the high-temperature expanding agent C comprises 20-25 parts of dihydrate gypsum, 20-25 parts of bauxite and 50-60 parts of magnesium oxide. The invention solves the problems of high permeability and poor corrosion resistance of set cement when only single-mesh silicon powder is used as an anti-recession agent in the prior art. The multifunctional high-temperature-resistant strength declining agent for oil well cement prepared by the invention can simultaneously meet the requirements of high corrosion resistance and low permeability of set cement, prevention of shrinkage of a cement sheath, micro-expansion function and long service life, and overcomes the defects of an oil and gas well cementing technology in related fields.

The present application relates to the field of oil and gas well cementing engineering, and particularly relates to an oil-based drilling debris cementing slurry system, a preparation method and application thereof. The oil-based drilling debris cementing slurry system includes, in terms of weight parts, cement 100 parts, oil-containing drilling debris 25-45 parts, anti-pollution agent 0.5-5 parts, density adjusting agent 0-40 parts, expansion agent 0-5 parts, early strength agent 0-5 parts, dispersing agent 0-3 parts, suspending agent 0-3 parts, fluid loss reducer 1-10 parts, and water 50-70 parts. The oil-containing drilling debris is selected from oil-extracted drilling debris with a particle size of 0.3-20 microns, and more than 90% of the particles have a particle size of less than or equal to 9.44 microns. The oil-based drilling debris cementing slurry system provided by the present application can adjust the density of the oil-based drilling debris cementing slurry system, prolong the thickening time and increase the compressive strength, thereby ensuring the long-term integrity of the cement sheath. Meanwhile, the problem of oil-containing drilling debris waste treatment is solved, and the waste oil-containing drilling debris is reused.

This invention discloses a method and apparatus for characterizing the gas leakage path in the micro-annulus of the entire wellbore. The method includes: extracting fracturing engineering parameters and geological parameters from the analyzed well fracturing design documents to obtain a combination of fracturing parameters; establishing a finite element model based on the geological and fracturing engineering parameters, and calculating the plastic strain of the cement sheath using the finite element model; training a neural network model using the combination of fracturing parameters as input and the plastic strain of the cement sheath as output to obtain a trained plastic strain prediction model; inputting the fracturing parameter combination of the target well into the plastic strain prediction model, outputting the predicted plastic strain of the cement sheath, and calculating the micro-annulus width based on the predicted plastic strain; and combining the micro-annulus width with an established three-dimensional visualized wellbore trajectory to characterize the gas leakage path in the micro-annulus of the entire wellbore. This invention can improve the accuracy of micro-annulus leakage risk prediction and visually display the gas leakage path.

The invention discloses continuous grading low-density oil well cement, low-density cement paste and a preparation method, and particularly, cement clinker, natural gypsum, fly ash, slag powder and silica fume are crushed, ground and screened to obtain continuous grading cement, the continuous grading cement is mixed with lightweight material perlite and chemical additives, and the density of the cement is adjusted while the density of the cement is adjusted, so that the continuous grading low-density oil well cement is obtained. And the particle size distribution between the cement and each material is optimized, so that the accumulation proportion between the materials reaches the maximum, the tensile strength is increased, and the porosity and permeability are reduced, thereby preventing the migration of formation fluid along a set cement matrix, effectively improving the fluid invasion resistance of a cement sheath, and further improving the early strength of the low-density set cement.

The present application relates to oil and gas well engineering cementing material field, disclose a kind of in oil and gas well reconstruction wellbore cementing operation method, wherein, the method comprises: with aqueous epoxy resin, first part cement and second part cement preparation cement slurry, then cement slurry is injected into cement sheath;Wherein, the weight ratio of aqueous epoxy resin, first part cement and second part cement is 1:30-60:75-125;The epoxy equivalent of the aqueous epoxy resin is 900-1300g / eq, D50 is 0.3-0.4 μm, D90 is 0.4-0.5 μm;The ratio of D50 of first part cement and second part cement is 1.5-10:1, and the ratio of D90 is 1.5-4.5:1.The obtained cement slurry has higher compressive strength and lower elastic modulus, while the fluidity is better, and the cement slurry density meets the needs of different pressure system shale gas reconstruction wellbore.

A single-trip efficient plugging tool (1000) integrating perforating, flushing, and cementing, and a use method therefor, aiming at solving the problem of perforating a poorly bonded casing section, flushing an annulus, and placing a cement plug in a single operation to achieve permanent plugging. The tool comprises an integrated high-pressure flushing and cement plug placement tool (100), a releasing tool (200), a well abandonment bridge plug setting tool (300), and a perforating tool (400) which are sequentially connected; the perforating tool (400) is used for perforating a poorly bonded casing section so as to crush a poorly bonded cement sheath (104) located in an annulus (103) between an inner casing (101) and an outer casing (102); the well abandonment bridge plug setting tool (300) is used for setting below the poorly bonded casing section; the releasing tool (200) is used for separating an upper tool string from the well abandonment bridge plug setting tool (300) when the well abandonment bridge plug setting tool (300) completes setting; the integrated high-pressure flushing and cement plug placement tool is used for flushing the poorly bonded casing section so as to discharge crushed cement and other debris from the annulus (103), and then injecting cement into the annulus for plugging.

A kind of well abandonment casing cement sheath crushing test device and method, including test table, axial movement system, rotating system, cement sheath crusher, clamping system, hydraulic loading system, cement sheath filling system, the movement and working condition of cement sheath crusher are controlled by axial movement system, rotating system, hydraulic loading system to realize the extrusion crushing of cement sheath;The working parameters when crushing cement sheath are adjusted by changing the high-pressure liquid output to axial movement system, rotating system, cement sheath crusher by hydraulic loading system, the overall structure is simple, easy to process manufacture assembly, can measure the working pressure and torque of cement sheath crusher, test the operating performance of cement sheath crusher, more complete simulation cement sheath crusher specific working condition when downhole operation, the optimization improvement of tool and the improvement of the whole casing recovery operation mode have positive reference significance and popularization value.

This invention discloses a cementing quality evaluation system and method for deep shale gas wells, belonging to the technical field of cementing quality evaluation for deep shale gas wells. The cementing quality evaluation system for deep shale gas wells includes a data collection component connected to a data set module for data aggregation. The data set module is connected to a strength evaluation component for assessing the strength of cement sheath bonding and a network training component for training a neural network. The network training component is connected to a structure determination component for determining the neural network structure. The structure determination component is connected to a real-time evaluation component for evaluating the cementing quality of shale gas wells. The network training component is connected to the real-time evaluation component. This invention effectively solves the problems of long evaluation time, high cost, and inaccurate evaluation results in existing shale gas well cementing quality evaluation methods.

This invention discloses a method for azimuth imaging of the second interface of cement sheath in casing wells and for inverting the properties of the cement sheath medium. This invention utilizes a common-center-point superposition and other reflection wave imaging method to extract and image the reflection waves from the second interface of the cement sheath. When the reflected waves cannot be clearly observed in the original data, this processing method significantly enhances the reflected wave signal. The arrival time of the reflected waves is reliably picked up through the reflection wave imaging map. Combined with the annular medium impedance calculated from the casing imaging logging, the sound velocity and thickness of the cement or fluid in the annular medium, as well as the casing eccentricity, are inverted. This invention can achieve azimuth reflection wave imaging of the second interface of the cement sheath, invert the thickness and velocity of the cement sheath medium in different azimuths, and also provides a method for calculating the casing eccentricity.

The application discloses a casing centralizer with pipe diameter adjusting function, and relates to the technical field of oil and gas drilling engineering equipment, which comprises two fixed rings which are symmetrically distributed left and right, the outer surfaces of the fixed rings are provided with a plurality of fixed seats which are equidistantly arranged along the circumferences of the fixed rings, the fixed seats are all rotatably connected with connecting plates, an elastic plate is arranged between the left and right connecting plates in the horizontal direction, and the two ends of each elastic plate are rotatably connected with the adjacent two connecting plates. The application drives the screw rod and the fixed pipe to be in threaded transmission by rotating the adjusting bolt, the distance between the two fixed rings is accurately controlled, the annular support frame formed by the connecting plates and the elastic plates is caused to have controllable radial deformation, stepless adjustment of the support outer diameter is realized, different wellbore sizes are accurately matched, the problem of insufficient support or difficulty in running of the fixed-size centralizer is overcome, and the casing is efficiently centered, so that the foundation for forming a uniform cement sheath is laid.

The application discloses a cement sheath plastic strain accumulation evaluation method under large-scale staged fracturing conditions, and is applied to the technical field of oil and gas well engineering. The existing evaluation methods do not fully consider the influence of temperature on the mechanical properties of cement stone and the plastic strain accumulation law of cement stone under high-temperature environment, and there is still a large difference between the evaluation results and the actual situation. The application prepares cement stone samples maintained under different temperature environments, carries out triaxial compression tests on the cement stone under different temperatures, establishes a functional relationship between the mechanical parameters of the cement stone and the test temperature, carries out triaxial cyclic loading and unloading tests on the cement stone under a specific temperature, obtains the cyclic loading and unloading stress-strain curve of the cement stone, and establishes a cement stone nonlinear elastic-plastic constitutive model considering the temperature effect and the cyclic attenuation characteristics. Based on the constitutive model, numerical simulation of the mechanical response of the cement sheath under large-scale staged fracturing conditions and evaluation of the plastic strain accumulation law of the cement sheath are carried out.

The application discloses a cement ring micro-gap evaluation device, a differential pressure calculation method and an evaluation and correction method, relates to the technical field of well cementing integrity evaluation, and comprises a kettle body and a sleeve, the kettle body is coaxially arranged outside the sleeve, and an annular cavity is formed between the kettle body and the sleeve; a sealing element is arranged to seal the upper and lower ends of the inner cavity of the sleeve and the annular cavity; a pressure injection system and a pressure control system are arranged, the pressure control system is connected with the pressure injection system; the sleeve is elastic; further comprising a fluid supply assembly for providing fluid through the micro-gap; a pressure measurement assembly is arranged to measure the fluid pressure values of the upstream and downstream of the micro-gap respectively; and a metering element is arranged to be matched with the fluid supply assembly. The application can solve the problems of evaluation and prediction model verification of the sealing and seepage capacity of the micro-gap under different pressures, and provides a scientific and feasible technical scheme for well cementing integrity evaluation.

The invention belongs to the field of oil and gas field development, and relates to a radial horizontal well yield and injection increasing system and method based on abrasive jet. The system comprises a forging, milling and reaming unit and a radial drilling unit, the forging, milling and chambering unit comprises a rotary faucet and a forging, milling and chambering tool string; the radial drilling unit comprises a radial drilling tool string; the forging, milling and chambering tool string is used for performing hydraulic forging, milling and chambering treatment on the casing section and the near wellbore zone reservoir to form a reservoir cavity; the radial drilling tool string is used for implementing radial horizontal drilling in a reservoir. According to the method, a casing, a well cementation cement sheath and a reservoir are subjected to erosion crushing through abrasive jet, and the casing forging and milling process and the reservoir chambering process are integrated into one pipe column operation to be completed; then, abrasive jet is conveyed through a continuous oil pipe, radial horizontal rock breaking drilling is carried out on the reservoir, and multi-layer and multi-direction radial horizontal holes are formed; the system and the method are suitable for shaft transformation operation under the conditions of low porosity, low permeability and hard reservoirs.

The utility model belongs to the field of petroleum equipment, and particularly relates to a rigid centralizer convenient for improving fluid flow. Comprising a sleeve and spiral ribs arranged on the sleeve in a sleeving mode, guide sleeves are arranged at the two ends of the sleeve, the two ends of the sleeve are sleeved with the guide sleeves, the outer walls of the guide sleeves are arranged in a cambered surface mode, guide grooves are further formed in the outer walls of the guide sleeves, the guide grooves are obliquely formed in the outer walls of the guide sleeves, and the spiral ribs are arranged in the guide grooves. A groove opening of the guide groove is attached to the side wall of the spiral rib, and the inclination direction of the guide groove is the extension direction of the spiral rib in the spiral direction. According to the centralizer, the guide sleeve is arranged, so that the flow guide effect of the whole centralizer is improved, the guide groove is arranged, the flow speed of most of slurry is increased, and the cement slurry or drilling fluid generates turbulent flow, so that the uniformity of a cement sheath is improved, and the purpose of improving the well cementation effect is achieved.