592 results about "Cement slurry" patented technology

The invention relates to the technical field of well cementation materials and provides well cementation cement stone based on water-based benzoxazine resin as well as a preparation method and application of the well cementation cement stone. The well cementation cement stone is prepared from the following components in parts by mass: 400-600 parts of quartz sand, 4-6 parts of a retarder, 4-6 parts of a fluid loss agent, 1-2 parts of a suspension stabilizer, 1-2 parts of a dispersant, 4-6 parts of a high-temperature-resistant water-based benzoxazine monomer and 40-50 parts of water, and the high-temperature-resistant water-based benzoxazine monomer is prepared from a phenolic compound, primary amine and formaldehyde through Mannich reaction. Resin formed by the prepared benzoxazine monomer has improved mechanical properties at a high temperature of 150-200 DEG C, the mechanical properties and high temperature resistance of well cementation cement at a high temperature are significantly improved by filling pores of set cement and optimizing cement components, the benzoxazine monomer in a cement slurry system does not affect the fluidity of cement slurry, and the well cementation cement has a good application prospect. Meanwhile, the high-temperature strength of set cement can be remarkably enhanced, and the cement is suitable for well cementation of high-temperature deep wells.

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.

Pumpable slurry compositions including at least one aluminosilicate additive and optional pozzolanic cement additives and methods including the pumpable slurry compositions improve development of compressive strengths in the pumpable cement slurry compositions. The methods utilize one or more pumpable cement slurry compositions including at least one cement component, water, at least one first aluminosilicate additive, at least one optional second aluminosilicate additive, and one or more optional pozzolanic additives, where the at least one first aluminosilicate additive has an amorphous phase of greater than about 50% and a weight ratio of silica oxide to aluminum oxide of about 1.0 to about 2.5, and the at least one optional second aluminosilicate additive has a weight ratio of silica oxide to aluminum oxide of about 1.7 to about 3.3.

A well-cementing cement stone reinforcing material and the use thereof. The well-cementing cement stone reinforcing material comprises, according to a mass ratio: 30-50 parts of an active spherical α-Al2O3 micropowder, 30-50 parts of spherical fly ash, 5-20 parts of nano metakaolin, 5-10 parts of a hydrophilic rubber powder, and 5-10 parts of hydrophilic carbon fibers. Adding the well-cementing cement stone reinforcing material to a cement slurry of an oil-gas well can promote the generation of a crystal phase having stable high-temperature strength during the hydration process of the cement slurry, thereby improving the high-temperature strength of cement stone; and can solve the problems of a decline in strength and an increase in permeability of the well-cementing cement stone in an ultra-high temperature environment, thereby effectively ensuring the long-term sealing integrity of a wellbore in an ultra-high temperature environment and preventing the annular pressure of an oil-gas well caused by cement ring damage.

The invention discloses a ground directional drilling goaf passing leaking stoppage method which comprises the steps that hole data of a goaf are obtained, and the hole data comprise the hole depth and the crack width; when the width of the crack is larger than 5 mm, a foundation plugging material is adopted for conducting foundation plugging on the hole of the goaf, and the foundation plugging material is an inert material and cement paste; judging whether basic plugging fails or not to obtain a first judgment result; if the first judgment result shows that the basic plugging fails, a flexible plugging material is adopted for conducting medium-term plugging on the holes in the goaf, and the flexible plugging material is a material formed by mixing hemp fiber, sawdust, soybeans and water. According to foundation plugging, a large channel is filled through particle bridging, a primary plugging layer is formed after cement paste is solidified, the flexible material can adapt to trace deformation of surrounding rock through deformation filling, and micro cracks of a foundation layer are plugged. Through graded gradient filling, the leaking stoppage effect can be greatly improved.

The invention discloses a high-temperature and high-pressure cement slurry suspension stability simulation experiment device and method.The device comprises an upper kettle body and a lower kettle body which are connected, and the upper kettle body is a thick-wall metal cylinder with an upper opening and a lower opening and comprises an upper kettle cover and an upper kettle cylinder; the upper kettle cylinder is a hollow thick-wall steel cylinder, the inner diameter of the lower portion of the upper kettle cylinder is smaller than that of the upper portion of the upper kettle cylinder, a boss is formed, the upper end face and the lower end face of the upper kettle cylinder are open and provided with internal threads, the upper kettle cylinder is connected with the upper kettle cover and the lower kettle body through fastening bolts, and a piston, a connecting rod, a rotating shaft supporting frame, a magnetic drive inner rotor and a paddle rotating shaft are arranged in an upper kettle inner cavity formed. A stirring blade and a slurry cup are accommodated in an inner cavity of the formed lower kettle body; the method and the device provided by the scheme better conform to the actual underground situation, can better reflect the suspension stability of the cement paste at high temperature and high pressure, and are more convenient to operate.

The invention relates to the technical field of performance detection of foam cement slurry for well cementation of oil and gas wells, in particular to a device and method for evaluating the compression performance of foam cement slurry. The former comprises a pressure tank, a test tank and a gas adding tank, the upper end of the pressure tank is provided with a gas inlet communicated with the inside and the outside, and the lower end of the pressure tank is provided with a liquid outlet communicated with the inside and the outside; a pressure transmission piston is vertically and slidably installed in the pressure tank in a sealed mode, and an identification layer is arranged on the outer side of the pressure tank. The device is reasonable and compact in structure, the gas adding tank can inject gas with different pressure values into the pressure tank, the control valve facilitates pressure control between the pressure tank and the testing tank, scale marks are marked on the measurable cup body so that the volume change of water for testing can be observed conveniently, and therefore the volume change of foam mud to be tested is reflected; the pressure measuring piston can transmit pressure to the foam cement slurry in the testing tank, air between the pressure measuring piston and the inner side of the upper portion of the testing tank can be emptied during operation by arranging the exhaust hole and the exhaust valve, and the measured volume error is reduced.

The invention discloses a TBM (Tunnel Boring Machine) segment behind-wall active closed grouting and stopping device and method, the device comprises a water-permeable and slurry-impermeable membrane bag with a grouting valve and a slurry outlet valve at the two ends respectively, and the device further comprises an external cement slurry tank and a water glass tank, and the cement paste tank and the water glass tank are respectively connected with a three-way valve arranged on the grouting valve through a cement paste grouting pipe and a water glass grouting pipe. The device comprises a water-permeable slurry-impermeable membrane bag with the two ends provided with a slurry injection valve and a slurry outlet valve respectively, and further comprises a cement slurry tank and a water glass tank which are arranged externally, and the cement slurry tank and the water glass tank are connected with a three-way valve arranged on the slurry injection valve through a cement slurry injection pipe and a water glass injection pipe respectively. Through the structure, active closed grouting is achieved, disordered diffusion of grout is prevented, and the beneficial effects that the grouting range can be accurately controlled, the compactness of the grout stopping body is improved, gaps and holes are avoided, and therefore the long-term stability of a tunnel is enhanced are achieved.

The invention discloses a well cementation cement slurry system suitable for a high-CO2-content acidic oil and gas field and a preparation method of the well cementation cement slurry system, and relates to the technical field of well cementation materials for oil and gas field development. The well cementation cement slurry system comprises the following components in percentage by weight: 56-75 wt% of G-grade oil well cement, 15-25 wt% of a hydration-corrosion-resistant reinforcing material, 5-8 wt% of a composite corrosion-resistant admixture, 3-5 wt% of an anti-cracking tough material, 0.5-1 wt% of a dispersing agent, 1-3 wt% of a fluid loss agent and 0.5-2 wt% of a retarder, the hydration-corrosion-resistant reinforcing material is formed by mixing micro-silicon, red mud and a nano magnesium phosphate gelling agent according to the mass ratio of 8: 12: 1. The invention also discloses a preparation method of the well cementation cement slurry system. The well cementation cement slurry system has the characteristics of high toughness, high compressive strength, low permeability, good engineering performance, excellent corrosion resistance and the like.

The invention relates to the technical field of well cementation admixtures, in particular to a high-temperature-resistant modified nano silicon dioxide polymer fluid loss agent and a preparation method of the high-temperature-resistant modified nano silicon dioxide polymer fluid loss agent. The preparation method comprises the following steps: adding 2-acrylamide-2-methyl-1-propanesulfonic acid and itaconic acid into deionized water, uniformly mixing, then adding N, N-dimethylacrylamide and modified nano silicon dioxide, uniformly mixing to obtain a mixed material, then adding an initiator into the mixed material in a nitrogen atmosphere, reacting to obtain a reaction product, and finally, adding a water reducer into the reaction product, and stirring to obtain the modified nano silicon dioxide / 2-acrylamide-2-methyl-1-propanesulfonic acid / 2-acrylamide-2-methyl-1-propanesulfonic acid composite material. And washing, filtering, drying and grinding the reaction product in sequence to obtain the product. The high-temperature-resistant modified nano silicon dioxide polymer fluid loss agent disclosed by the invention has good thermal stability, and can effectively resist high temperature of 180 DEG C, maintain excellent fluid loss reduction property and ensure the well cementation quality of an oil field when being added into well cementation cement paste with the addition amount of 2.5%-5.0%.

The application provides a one-way sealing ring, a sealing mechanism, a tail pipe top packer and a tail pipe cementing process, wherein the one-way sealing mechanism comprises a center pipe, an upper deformed sleeve arranged on the outer wall of the center pipe, a lower deformed sleeve arranged on the outer wall of the center pipe, the upper deformed sleeve and the lower deformed sleeve being spaced apart in the axial direction, a sealing element arranged on the outer wall of the center pipe, the lower end of the sealing element being in abutment with the upper end of the lower deformed sleeve, an expansion cone arranged between the upper deformed sleeve and the sealing element, a sealing groove being arranged on the inner wall of the expansion cone in the circumferential direction, a sealing ring being arranged in the sealing groove, a flow-off groove being arranged on the inner wall of the expansion cone in the axial direction, the flow-off groove penetrating through the upper end and the lower end of the expansion cone, and fluid being allowed to flow only in one direction from the upper end of the expansion cone to the lower end of the expansion cone along the flow-off groove, while the fluid under the packer is allowed to flow upward, the wellhead annulus is allowed to be pressurized for cement setting, the pressure reduction caused by volume shrinkage is prevented to prevent the stratum fluid from flowing out, and the cementing quality is ensured.

The present application belongs to the technical field of geotechnical engineering and indoor test, and provides a visual test device and method for interaction between high-pressure rotary jet flow and soft soil, which comprises a detachable model box, a jet medium simulation system, a high-pressure rotary jet flow generation system, an overburden pressure simulation system, a data acquisition system and a tracing system.The test device has the advantages of high visual degree, detachability, easy assembly and easy production.The jet medium simulation system has significant shear thinning characteristics, and has a high degree of reduction of the non-Newtonian fluid properties of cement slurry, which not only overcomes the problem of easy blockage of the pipeline, but also avoids distortion defects.The trajectory of the fluorescent powder particles in the jet medium simulation system can be captured by a high-speed camera under the irradiation of the pulsating laser beam generated by the pulsating laser, so as to accurately reproduce the flow field information of the high-pressure rotary jet flow in the soft soil.

This utility model discloses a waterproof structure for lightweight aggregate concrete partition walls, relating to the technical field of concrete partition walls. It includes an autoclaved aerated concrete (AAC) plate, with two foamed sandwich panels fixed to its outer wall. Gypsum board is fixed to the side of each foamed sandwich panel that is far from each other. A reinforcing plate extends from one side of the AAC plate, and a retaining strip extends from the side of the reinforcing plate away from the AAC plate. A retaining groove is formed between the end of the AAC plate away from the reinforcing plate and the two foamed sandwich panels. The AAC plate, reinforcing plate, and retaining strip are integrated. Through the AAC plate, reinforcing plate, retaining strip, retaining groove, main reinforcing groove, and secondary reinforcing groove, the overall structural strength of the wall can be enhanced. Simultaneously, the wall is spliced ​​using a retaining method, and the space at the splice can be used to pour cement slurry, filling the splice to increase the stress points of the wall and improve the overall strength of the wall.

The present application relates to the technical field of concrete, and particularly relates to a method for preparing foam concrete by using carbon dioxide foam, which comprises the following steps: preparing super-stable carbon dioxide foam: uniformly dispersing nanoparticles in water to prepare a nanoparticle suspension; adding a surfactant to the nanoparticle suspension and uniformly stirring to prepare a nanoparticle foaming agent; sucking the nanoparticle foaming agent by a foaming machine, and introducing carbon dioxide to prepare stable carbon dioxide foam; uniformly stirring water and a water reducing agent in cement to obtain a cement slurry, introducing carbon dioxide gas into the cement slurry to obtain carbonated cement slurry; adding a foam stabilizer to the carbonated cement slurry and the prepared carbon dioxide foam, and continuously stirring until the carbon dioxide foam is completely introduced into the cement slurry. The foam concrete prepared by the method has a density which is at least one third lower than that of the existing method under the condition of unchanged strength, so that the application scenarios of the foam concrete are increased.

The invention provides a U-shaped well superconductive hot cement slurry and annulus heat exchange monitoring method, which comprises the following steps that: according to the structural characteristics of a vertical section, a horizontal section and a transition section of a U-shaped well, each section of monitoring equipment is correspondingly configured with an independent monitoring control unit, and a parameter normal threshold matched with the performance of the superconductive hot cement slurry is preset in each unit; based on the physical association of annular heat exchange, the monitoring control units with the parameter linkage relation are connected through logic chains to form a plurality of logic chains, and an association threshold value is preset for each logic chain; a logic chain linkage analysis module is arranged, the trigger state of each logic chain is monitored in real time, an exclusive monitor is configured for each cross-section logic chain, and a superconductive hot cement slurry performance parameter and a composite standard comparison reference of an annular heat exchange normal working condition are built in the monitor; the fault type, the influence range and the severity are judged by adopting a three-step method of single-parameter primary judgment, cross-parameter verification and linkage fault grading through a built-in exclusive monitor of a composite standard comparison reference.

This invention discloses an energy-saving pole centrifugal device, belonging to the field of pole processing technology. It includes a support frame, with a centrifugal mechanism at the top of the support frame. The centrifugal mechanism includes a centrifugal cylinder rotatably mounted at the top of the support frame. A third motor is fixedly mounted at the top of the support frame, and a gear is fixedly mounted on the output shaft of the third motor. A limit assembly is provided on the outside of the centrifugal cylinder, and a gear ring is fixedly mounted on the outside of the limit assembly, with the gear meshing with the gear ring. A flow guiding mechanism is provided near the top of the centrifugal cylinder on the support frame. This invention, through the synergistic effect of sliding spiral flow guiding ribs on the inner wall of the centrifugal cylinder and a spiral stirring plate on the outside of the hollow column, can both prevent the concrete aggregate from being sheared and damaged, and fully agitate the concrete, promptly expel internal air bubbles, break the stratification interface of sand, cement slurry, and water during centrifugation, reduce defects such as inner wall laitance, honeycomb, and holes, and significantly improve the pole forming quality and structural stability.

1. Name of the product in this design: Grouting Density Meter. 2. Purpose of this design: To measure the density of cement slurry. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: the front view.

The utility model relates to a cement paste stirring device, belongs to the technical field of engineering equipment, and particularly relates to a cement paste stirring device with a specific gravity detection function, which comprises a stirring barrel, a support plate is fixedly mounted at the top of the stirring barrel, a motor is fixedly mounted on the support plate, a stirring rod is arranged in the stirring barrel, and the motor is fixedly mounted on the stirring rod. A communicating chamber is fixedly mounted on one side of the stirring barrel; the device further comprises a specific gravity detector; according to the utility model, the effects of automatic detection and practicability enhancement are achieved, and the problems that an existing stirring barrel does not have a slurry specific gravity detection function, slurry needs to be extracted for detection after stirring, re-extraction, re-detection and repeated detection are needed for disqualification, and the use process is not convenient enough are solved.

The invention relates to the technical field of foam cement slurry preparation and maintenance, in particular to a foam cement slurry preparation and maintenance device and method.The foam cement slurry preparation and maintenance device comprises a base, a slurry cup, a stirring assembly, a driving mechanism and a heater, and the slurry cup is fixedly installed on the upper side of the base. The foam cement slurry stirring device is reasonable and compact in structure, the driving mechanism capable of enabling the stirring assembly to rotate is arranged in the base, so that the driving mechanism is separated from the slurry cup, the leakage phenomenon at the joint of the driving mechanism and the slurry cup can be avoided, and the phenomenon that the density of prepared foam cement slurry does not conform to the design after liquid leakage is avoided; the maintenance frequency can be reduced, a heater is arranged, after foam cement slurry is prepared, the foam cement slurry can be sealed to enter a heating maintenance stage, meanwhile, a driving mechanism can be started, the slurry is stirred during heating maintenance, the on-site pumping process is simulated, and the maintenance process conforms to the actual on-site construction.

The application discloses a method for wall pouring and goaf grouting by using coal gangue slurry, and linearly arranges end grouting filling unit and grouting wall pouring unit at a cut line between adjacent fully mechanized mining faces. The two units share a large-volume buffer tank, a self-suction double-liquid grouting pump of the grouting wall pouring unit sucks coal gangue slurry from the large-volume buffer tank through one self-suction pipe, and sucks cement slurry from a stirring tank through another self-suction pipe; the slurry sucked by the two self-suction pipes is injected into a template arranged behind an end of the fully mechanized mining face through a mixed slurry conveying pipe to form a wall beside the fully mechanized mining face. After the filling pump of the end grouting filling unit self-sucks or receives the coal gangue slurry from the large-volume buffer tank, the coal gangue slurry is injected into a goaf through a pre-embedded grouting pipe and a grouting hole on a roof of a remaining roadway along the goaf to realize goaf grouting filling. The application effectively combines the two technologies of the remaining roadway along the goaf and the goaf grouting filling, can improve the resource recovery rate of coal, can dispose solid waste in situ, and can reduce ecological pollution.

The application provides an organic-inorganic grafting type suspension stabilizer, a raw material composition and a preparation method thereof and a cement slurry. The raw material composition comprises: 15-45 parts of a sulfonic acid group monomer, 60-180 parts of a hydrophobic monomer, 1-15 parts of a cationic monomer, 1-15 parts of an ether monomer containing an allyl group and modified inorganic material; wherein the modified inorganic material is obtained by modifying 0.1-1.5 parts of inorganic material by 1-15 parts of a vinyl organosilicon monomer. The organic-inorganic grafting type suspension stabilizer provided by the application can maintain good sedimentation stability of the cement slurry at a higher bottom hole circulating temperature, can effectively eliminate free liquid, does not affect the cement slurry grouting and cementing, has no adverse effect on the cement slurry thickening and fluid loss, and can meet the demand of most deep well cementing.

A mixer and a method for the mixing of a cementitious slurry, configured to calculate the volume of the cementitious slurry in the mixer in order to produce an improved mixing process and / or an improved cementitious product. The mixer comprises a sensor to measure a parameter of the slurry in the mixer that is used to calculate the volume of slurry in the mixer.

This invention relates to the technical field of embankment reinforcement structures, and in particular to a scour-resistant reinforcement structure and method for flood control embankment slopes. The structure includes a soft bag that can be laid along the length of the slope, and two partitions placed inside the soft bag. The partitions divide the internal space of the soft bag into a shaping cavity, an air return cavity, and a buffer cavity from bottom to top along the thickness direction of the soft bag. By directly attaching the soft bag to the slope surface, there is no need to excavate step trenches or stacking platforms beforehand. This not only avoids extensive earthwork excavation but also protects the overall slope surface, simplifies the construction process, and improves work efficiency. Furthermore, the deformable nature of the soft bag facilitates transportation, rapid deployment, and applicability to slope surfaces of different shapes. By injecting cement slurry into the shaping cavity, the slope naturally solidifies and takes shape, eliminating the arduous process of manually handling and stacking stones in traditional methods.

The present application relates to the technical field of cementing cement slurry, in particular to a low-density cementing cement slurry system and application thereof, the low-density cementing cement slurry system comprises, in terms of weight fraction, in-situ toughness cement 100 parts, fly ash 70-100 parts, quartz sand powder 65-90 parts, glass beads 45-65 parts, microsilica powder 10-20 parts, plaster of paris 3-6 parts, quicklime 3-6 parts, slaked lime 3-6 parts, early strength agent 3-6 parts, fluid loss additive 10-14 parts, retarder 5-10 parts, and water 255-325 parts. The present application uses in-situ toughness cement to replace conventional G-grade cement, can quickly form gel on the surface, and improves the resistance of the system to high temperature in combination with the protection of high-temperature additives. In addition, the present application designs a new temperature variation experiment scheme according to the field construction process, shortens the time for the low-density system to withstand high temperature and high pressure at the bottom of the well, reduces the amount of high-temperature-resistant additives and viscosity-increasing stabilizing materials, and improves the high-temperature heat dilution, delamination instability of the system.

The utility model relates to the technical field of cement-cement ratio measurement, in particular to an instrument for rapidly measuring the water-cement ratio, which comprises a cylindrical container, an inner cavity is arranged in the cylindrical container, and a measuring structure is arranged above the cylindrical container; when the water-cement ratio is measured, cement paste is added into the inner cavity, then the cross plate frame is arranged at the top of the cylindrical container, the buoyancy measuring column is inserted into the cylindrical pile casing, the conical buoyancy gyroscope is inserted into the cement paste at the moment, and when the buoyancy measuring column is stable, the water-cement ratio can be judged by reading the scale value. The value of the scale is related to the cement paste density, the larger the density is, the larger the buoyancy is, the lower the water cement ratio is, the water consumption needs to be increased, otherwise, the smaller the water cement ratio is, when the water cement ratio is fixed, the larger the value of the scale and the larger the buoyancy represent that the cement paste density is large, the water cement ratio is low, the water consumption needs to be increased, and the larger the value of the scale is, the density is in direct proportion to the value of the scale. Therefore, the water cement ratio can be rapidly measured through a calculation formula, and the quality performance of the cement paste is improved.

The vertical shaft excavation drilling tool comprises a liquid injection mechanism used for injecting a urease solution and a drill rod, a drill bit is fixedly installed at one end of the drill rod, a groove is formed in the side wall of the drill rod and extends in the length direction of the drill rod, and the liquid injection mechanism is used for injecting the urease solution. A liquid inlet hole and a plurality of liquid outlet holes which are communicated with the groove are formed in the side wall of the drill rod, the liquid inlet hole is located at the end, away from the drill bit, of the drill rod, the liquid outlet holes are distributed in the length direction of the groove and located at the end, close to the drill bit, of the drill rod, and the liquid injection mechanism is communicated with the liquid inlet hole. The utility model aims to solve the problems that in the prior art, cement slurry materials or cement-water glass mixed slurry is mostly adopted to block cracks after water leakage of the side wall of a vertical shaft, but the cement slurry materials can shrink after being hardened, small cracks are easily generated, the cracks are gradually enlarged under hydraulic scouring, and the water blocking effect is poor. And the construction difficulty of plugging the crack after water leakage is high.

The application discloses a preparation method of a thermal gradient self-adaptive hybrid modified retarder, and the method comprises the following steps: dissolving a metal chelating agent monomer and a hydroxide into water and stirring to obtain a first solution; adding an organic small molecule into the first solution to react and obtain a second solution; adding a reaction agent dropwise into the second solution to react and obtain a third solution; and filtering the third solution to obtain the retarder. The thickening time of the cement slurry added with the retarder can meet the construction requirements of high temperature and high pressure, and the cement slurry still has good early strength and other characteristics under the condition of lower temperature, so that the purpose of temperature self-adaptation is achieved, and the construction safety and quality of the ultra-deep well cementing are ensured.

The invention relates to the technical field of well cementation cement paste, in particular to high-temperature-resistant and gas channeling-resistant well cementation cement paste and a preparation method of the high-temperature-resistant and gas channeling-resistant well cementation cement paste. The preparation method comprises the following steps: adding a required amount of a fluid loss agent, a toughening anti-channeling agent, a dispersing agent, coarse quartz sand, fine quartz sand, an expanding agent and a slurry stabilizer into oil well G-grade cement, mixing to obtain a dry material, then adding a high-temperature-resistant retarder into water, uniformly mixing to obtain a wet material, and finally adding the wet material into the dry material, and uniformly stirring to obtain the oil well cement. The high-temperature-resistant and gas-channeling-resistant well cementation cement slurry obtained by reasonably grading the coarse quartz sand and the fine quartz sand and compounding the additives not only has good slurry stability and rheological property, the high-temperature resistance can reach 150 DEG C, the thickening time is adjustable, but also has good gas-channeling-resistant property, the static gelling strength development is fast, and the high-temperature-resistant and gas-channeling-resistant well cementation cement slurry can be used for well cementation. And the compressive strength is not obviously depleted in 7-28 days.

The invention relates to the technical field of wear-resistant terrace construction, and discloses a construction method of a wear-resistant terrace. The method comprises the following steps: (1) pouring an interface agent on a base layer to obtain an interface agent layer; the interface agent is neat cement paste or a combination of neat cement paste and polymer emulsion; (2) semi-dry slurry containing dry and hard cement mortar is laid on the interface agent layer for fine leveling construction, and a dry and hard cement mortar layer is obtained; the mass ratio of dry hard cement mortar to water in the semi-dry slurry is 100: (7-11); and (3) sequentially arranging a wear-resistant aggregate layer and a curing agent layer on the upper surface of the dry hard cement mortar layer to obtain the wear-resistant floor. By means of the construction method of the wear-resistant floor, one-time precise leveling can be achieved, and the construction period is remarkably shortened.

The invention relates to a recyclable squeezing bridge plug which comprises a central pipe, a lower connector, a first connecting sleeve and a lock cap which are connected in sequence. The rotary joint, the coupling, the oil pipe and the round head guide shoe are connected in sequence; the sliding valve, the ball seat, the lining, the blocking ball capable of being fixed to the ball seat and the setting assembly arranged on the central pipe are arranged on the base; the slide valve is provided with a first channel, and the side wall of the lower joint is provided with a second channel which can be communicated with the first channel; the lining is connected with the ball seat through a rivet, a third channel is arranged on the side wall of the lining, a fourth channel is arranged on the side wall of the ball seat, and when the rivet is not broken, the third channel is communicated with the fourth channel. According to the scheme, after the cement paste is directly injected into the bottom of the well body through the third channel and the fourth channel, the cement paste circulates upwards, the problem that cement escapes outwards along a well body leakage layer when the well is sealed by cement is avoided, the cement paste can fully fill a target area of the well body, and the conditions that the stratum is blocked and the permeability is too high are avoided.