1020 results about "Cement slurry" patented technology

The present invention relates to a sealing method for high-flow water inrush at a side wall of a foundation pit, the method comprising: calculating the minimum radius of a counter-pressure soil berm on the basis of the flow time of a liquid slurry in the counter-pressure soil berm being not less than the chemical setting time of the liquid slurry; piling up filtering sand bags on a foundation pit excavation face at a water inrush point, and constructing the counter-pressure soil berm; constructing annular grouting holes at the foundation pit on the outside of support piles and a cut-off curtain; according to the planar arrangement of the annular grouting holes, successively injecting a double-liquid slurry formed by mixing a cement slurry and sodium silicate into the annular grouting holes; inspecting the water seepage condition on the periphery of the counter-pressure soil berm until no water seepage occurs on the periphery of the counter-pressure soil berm; and excavating the counter-pressure soil berm layer by layer until the excavation reaches the pit bottom without water seepage observed at a side wall of the foundation pit. The present invention has the beneficial effects that: the size of the counter-pressure soil berm is optimally designed on the basis of the condition that the flow time of the double-liquid slurry in the soil berm is longer than the setting time, so as to solve the problems of slurry setting failure and poor grouting and sealing effects, thus saving a large amount of grouting materials, and reducing economic loss caused by secondary sealing.

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 method of cementing a geothermal wellbore includes pumping a first volume of cement slurry down a wellbore. The first volume of cement slurry has a first water to cement ratio. A second volume of cement slurry is pumped down the wellbore. The second volume of cement slurry has a second water to cement ratio that is less than the first water to cement ratio. The first volume of cement slurry hardens at a vertical portion of the wellbore, and the second volume of cement slurry hardens at a horizontal portion of the wellbore.

The invention discloses deep coal bed gas well cementation cement paste and a preparation method thereof, and the deep coal bed gas well cementation cement paste is prepared from the following raw materials in parts by weight: 100 parts of G-grade oil well cement, 5-15 parts of water-borne epoxy resin, 1.5-3 parts of a nano silicon dioxide solution, 0.5-1.8 parts of calcium sulfate whiskers, 0.2-0.6 part of composite coating fibers, 1.2-1.8 parts of a fluid loss agent and 0.5-1.8 parts of a retarder. 0.3 to 0.5 part of a drag reducer, 0.2 to 0.5 part of a defoaming agent and 38 to 42 parts of water; wherein the composite coating fiber is hydrophilic epoxy resin modified polyethylene fiber. The cement paste can improve the well cementation cementing packing quality of a coal seam, and has good filtration property.

The present invention discloses a method for preparing a high-ionic conductivity cement-based structured electrolyte and the electrolyte, comprising: mixing a polymer solution, cement, and fine sand to obtain a polymer-cement slurry; subjecting the polymer-cement slurry to low-temperature, sealed curing, and then allowing it to stand at room temperature to obtain a cement-based structured electrolyte. The present invention utilizes a controlled phase separation technique to enable elastic phase separation of the polymer network prior to cement hydration. During the hydration process, the cement adaptively forms the backbone of the polymer network, resulting in a good interface between the two, capable of forming continuous, high-conductivity ion channels. The preparation process is simple to operate and highly reproducible.

The invention provides a foundation pit water gushing iron ore grading thixotropic blockage reduction method which comprises the steps that iron ore tailings are crushed and screened into multi-stage particle size particles, and a customized mold is subjected to 3D printing based on foundation pit scanning data; paving particles in a mold layer by layer, doping iron powder, and cementing and curing cement paste to form a prefabricated body; the prefabricated body is installed to a water gushing area, the slurry viscosity is increased through a grading contact network, a weak gravitational flow state is triggered to be transiently changed to an anti-scouring state, and water flow speed reduction is achieved; alternating field induction micro-vibration is synchronously started during lateral grouting, and grout permeation and bubble discharge are driven; after solidification, the guide core body is pulled away, and remaining pore channels are self-compacted by a grading system to form an anti-seepage structure. The method has the advantages that the anti-scouring performance is enhanced; particle-slurry-foundation pit curved surface triple self-adaptive combination is carried out; the engineering cost is reduced.

The invention discloses a coral reef geological cast-in-situ bored pile side friction calculation method which comprises the following steps: S1, carrying out on-site pouring construction, collecting a slurry-containing rock core sample, and determining an effective radius; s2, determining the interface friction angle of concrete-coral reef rock of each level of stratum and the cementation shear strength of a slurry-containing rock core; s3, solving a slurry occlusion area coefficient according to the effective radius, integrating the interface friction force and the cementation additional frictional resistance, and establishing a side frictional resistance calculation formula; according to the method, in combination with an on-site pouring test, the infiltration-cementation occlusion effect of cement paste in coral reef rock is quantified, additional friction caused by the cementation effect is synthesized, a side friction calculation formula of a traditional pouring pile is corrected, and the problem that in traditional design calculation, the coral reef stratum bearing capacity is remarkably underestimated is solved; the construction design of the cast-in-place pile is reliably and accurately guided; all tests can be completed within 48 hours on site, and the offshore exploration cost can be remarkably reduced.

A wellbore staged operation method includes running, after a first well drifting operation is performed on a wellbore, a pipe string (100) in the wellbore, wherein the pipe string (100) includes, along a direction from bottom to top, a floating hoop (2), a plug seat (7), a toe-end sliding sleeve (3), and a fracturing sliding sleeve (4); performing a cementing operation, wherein cement slurry pumped into an inner chamber of the pipe string (100) enters an annulus between the pipe string and the wellbore through the plug seat (7) and the floating hoop (2) to form a cement sheath, the cement sheath isolating the toe-end sliding sleeve (3) from the fracturing sliding sleeve (4); performing a second drifting operation to ensure the toe-end sliding sleeve (3) of the pipe string (100) exposed; performing a pressure test for the pipe string; and performing staged fracturing constructions.

A numerical simulation method for the integrity of cement sheath systems in oil and gas wells under alternating temperature and pressure is characterized by the use of extended finite element method (XFEM), concrete damage plasticity model theory, Cohesive element method, and bilinear traction separation criterion, based on elastoplastic theory and plastic damage theory. This method can simulate not only the failure process of the cement sheath-casing interface under alternating temperature and pressure and characterize the mechanical behavior of interface failure, but also the failure process of the cement sheath itself and characterize its mechanical behavior. By comprehensively analyzing the failure behavior of the cement sheath system integrity in oil and gas wells, this method enables a realistic evaluation, prediction, and diagnosis of the integrity of the casing-cement sheath-casing assembly system under alternating temperature and pressure, which helps optimize cement slurry systems, improve cementing quality, and prevent cement sheath integrity failure. This invention is applicable to the field of oil and gas drilling and production engineering technology.

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 relates to the technical field of fluid-state solidified soil, and particularly discloses high-fluid-state solidified soil and a preparation method thereof. The high-flow-state solidified soil is prepared from the following raw materials in parts by weight: 1100 to 1200 parts of recycled aggregate, 700 to 800 parts of river sand, 100 to 130 parts of a curing agent, 18 to 22 parts of a polycarboxylic acid water reducing agent, 75 to 85 parts of solidified soil repairing microcapsules and 55 to 95 parts of water, the solidified soil repairing microcapsule is prepared by taking polylactic acid and nano calcium carbonate grafted polyethylene glycol as composite membrane materials, and wrapping and forming sulphoaluminate cement paste through an emulsification-solidification method. The solidified soil repairing microcapsules are introduced into the solidified soil, pores in an interface transition area can be filled, micro cracks can be repaired, and the durability of the solidified soil is improved.

A method may include: introducing a resin modified cement slurry into a wellbore penetrating a subterranean formation, the subterranean formation comprising a caprock and a carbon dioxide injection zone, the resin modified cement slurry comprising: a resin; a hardener, a hydraulic cement; and water; and setting the resin modified cement slurry to form a set cement wherein the set cement forms a carbonation-resistant barrier in the carbon dioxide injection zone in the subterranean formation.

The invention discloses a protection device for treating a rock slope through cuttage planting, the slope comprises a slope body, a plurality of planting holes formed in the slope body and slurry sprayed and covered on the surface of the slope body and in the planting holes, a pluggable planting rod is arranged in each planting hole, each planting rod is formed by splicing two plate bodies, and the plate bodies are arranged in the planting holes. At least part of the planting rod is tightly attached to the planting hole, and the outer surface of the attached part of the planting rod is coated with a soluble connecting layer; a hidden flow channel is arranged at the end of the planting rod and used for conveying cement grout, and a plurality of through holes communicated with the hidden flow channel are formed in the outer surface of the planting rod within the range of the dissolvable connecting layer. Cement grout is poured into the rock mass through the hidden flow channel and the through hole, a miniature root pile with the planting hole as the core is formed, the integrity and stability of a slope shallow layer are remarkably enhanced, and structural support is provided.

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 cement-enhanced super-hydrophobic self-adaptive temperature control coating which comprises a thermochromic bottom layer and a radiation refrigeration surface layer, a primer adopted by the thermochromic coating is prepared from the following components in parts by weight: 3 to 6.6 parts of composite resin matrix, 0.4 to 1.2 parts of filler, 11 to 15 parts of thermochromic powder and 10 to 15 parts of organic solvent; and finish paint adopted by the thermochromic coating is prepared from the following components in parts by weight: 50 to 55 parts of SiO2 dispersion liquid, 2 to 9 parts of white cement slurry, 5 to 8 parts of hydrophobic modifier, 6 to 10 parts of low-surface-energy substance and 7 to 11 parts of migration-anchoring dual-function additive. The coating system disclosed by the invention can realize efficient cooling in a high-temperature environment, can keep thermal insulation performance in a low-temperature environment, has mechanical stability and self-cleaning performance required by long-term outdoor application, and is wide in applicability.

The invention relates to the technical field of open-type TBM (Tunnel Boring Machine) detrapping, and provides a detrapping method for an open-type TBM stuck in unfavorable geology, which comprises the following steps: arranging a self-propelled hollow grouting anchor rod above a TBM shield and a cutterhead, and injecting cement paste and chemical double-liquid slurry to reinforce surrounding rock to form a stable supporting body; after reinforcement is completed, top pilot tunnel manual expanding excavation is conducted, steel arch support is implemented, and meanwhile accumulated slag is removed; judging whether the TBM exits or not through a trial rotation cutter head, if not, sequentially expanding and excavating the right pilot tunnel and the left pilot tunnel, and continuously matching with supporting and slag removal until the TBM recovers tunneling; and after escape is completed, tunnel passing section surrounding rock convergence and settlement parameter monitoring is enhanced. By means of the method, the safety problem caused when workers enter the cutterhead to remove slag under the condition of poor protective measures is avoided, the operation safety is improved, meanwhile, the open TBM detrapping speed is increased, and the construction progress is prevented from being affected; in addition, used materials are universal, the construction technology is mature, and the advantages of being controllable in cost, simple in structure, high in applicability and the like are achieved.

The invention relates to the technical field of mining, and discloses a high and large stope barren rock and tailing cemented filling body artificial false bottom and a manufacturing method thereof. The artificial bottom comprises a framework structure, a waste rock layer and a tailing cementing material layer; wherein the skeleton structure comprises an upper-layer reinforcing mesh structure, a lower-layer anchor mesh structure and a steel fiber rope for connecting the upper layer and the lower layer; the skeleton structure is filled with the waste rock layer; gaps between the framework structure and the waste rock layer are filled with the tailing cementing material layer. According to the high and large stope barren rock and tailing cemented filling body artificial false bottom and the manufacturing method thereof, underground barren rock is used as main aggregate, the using amount of a cementing agent is greatly reduced, a reinforcing mesh-barren rock-cementing slurry composite flexible structure has extremely high mechanical performance, the maintenance period is remarkably shortened, the construction efficiency is improved, and the construction cost is reduced. And the construction cost is reduced.

The invention discloses an emulsified asphalt and steel slag ultrathin overlay mixture as well as a preparation method and application thereof, and relates to the technical field of road building materials. The emulsified asphalt and steel slag ultrathin overlay mixture comprises mineral aggregate, emulsified asphalt and cement, the mineral aggregate comprises 30%-35% of modified steel slag aggregate with the particle size of 5-10 mm, 60%-70% of limestone aggregate with the particle size of 0-5 mm and 1%-3% of limestone mineral powder; the preparation method of the modified steel slag comprises the following steps: primarily treating the steel slag with CO2 gas, soaking with cement slurry, soaking with a sulfydryl silane coupling agent, spraying the surface with methyl phenyl silicone resin to enable the steel slag to obtain hydrophobic coating, and finally spraying epoxidized soybean oil. By modifying the steel slag and optimizing mineral aggregate gradation, the ultrathin overlay prepared from the mixture is durable, anti-slip, anti-crack and waterproof, stable in structure and high in overall cohesive force.

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 relates to a method for preparing thick mud from shield siltstone slag to prevent slurry loss, and belongs to the technical field of urban underground engineering construction. The method for preparing thick mud from shield siltstone slag to prevent slurry loss comprises the following steps: preparation of slurry: taking bentonite slurry as base slurry, and then adding waste weathered rock powder, calcium carbonate, sodium carbonate, xanthan gum or electropositive gel to prepare plastic flowing slurry, so that the slurry reaches certain density and viscosity; in the tunneling process of the shield tunneling machine, prepared slurry is injected out of a shield shell through a plurality of grouting holes in the radius direction and formed in the circumferential direction of the shield shell of the shield tunneling machine, and the slurry is diffused along the surface of the shield shell and fills gaps of a shield body within a certain range; according to the method, the waste soil generated by the shield tunnel can be effectively utilized, the moisture content and fluidity of the cabin soil are controlled, meanwhile, shield tail cement grout is prevented from entering the cutterhead and the soil cabin to threaten construction safety, operation is easy and economical, and the construction efficiency is improved.

The invention discloses an intelligent monitoring and dynamic optimization regulation and control system for a cement mixing pile, and belongs to the technical field of cement mixing pile construction. The method comprises the following steps: determining a data acquisition range constructed on a cement mixing pile construction site, and obtaining a slurry spraying parameter set of the cement mixing pile for a cement slurry transportation pipe and a pile body parameter set of operation of a cement mixing pile body according to the data acquisition range; data preprocessing is conducted on the basis of the guniting parameter set and the pile body parameter set, and the guniting amount efficiency coefficient, the formation resistance coefficient and the perpendicularity adaptation coefficient K of the standardized data are obtained according to the divided sub-periods; according to the method, it is ensured that the guniting amount per linear meter meets the strength requirement through the current stratum guniting efficiency deviation coefficient, the complex stratum is rapidly adapted through the layer resistance coefficient, material waste is avoided, and meanwhile the manual intervention frequency of parameter regulation and control is reduced; the qualified rate of foundation treatment construction is improved from traditional manual control, and the construction period of a single pile is shortened.

The invention relates to the field of buildings, in particular to a laminated construction method for combining prefabricated pipe pieces and prefabricated linings. The method comprises the following steps that a prefabricated pipe piece and a prefabricated lining are combined to achieve overlapping construction; the concrete grade is the same as or does not exceed one concrete grade difference with the prefabricated pipe piece, and the prefabricated lining and the prefabricated pipe piece are combined into an overlapped structure in any one of the connection modes of embedded steel bar connection and embedded sleeve and stainless steel bolt pair connection; a gap is reserved between the prefabricated lining and the prefabricated pipe piece, the end is blocked by a steel plate or a concrete block, a grouting hole is reserved in the bottom, and an exhaust hole is reserved in the top; and after the jacking of the two parts is completed, grout such as non-shrinkage or micro-expansion cement paste and cement mortar is filled in the gap.

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 application discloses a kind of quicksand layer open-pit mine slope landslide protection structures, including first fiber concrete layer, drainage ditch, dry channel, shallow grouting hole and second fiber concrete layer, first fiber concrete layer is sprayed in bottom slope surface;Drainage ditch is set on the slope bottom surface and extends along the length direction of slope;Dry channel outer end is extended to bottom slope surface and is connected with drainage ditch, and its inner end extends to bottom slope interior and is connected with underground water;Shallow grouting hole is filled with cement slurry, and cement slurry can permeate to bottom slope interior to fill the quicksand layer pore after dry underground water;Second fiber concrete layer is sprayed on the surface of first fiber concrete layer.Avoid to treat entire quicksand layer, greatly save the amount of work and construction period, construction is simple, construction cost is low, economy is good, also avoid groundwater erosion, soften sand layer, improve the self-stability of quicksand layer, especially the stability of upper slope.

The invention provides a karst area grouting hole sealing anti-seepage reinforcement cage which comprises a main rod, a dowel bar, an expansion arc-shaped steel plate and a reinforcement cage body. The main rod can move axially and is located in the center of a pile hole, and the reinforcement cage is arranged around the main rod. The dowel bar is connected between the main rod and the expansion arc-shaped steel plate in a hinged mode and used for converting axial movement of the main rod into radial expansion movement of the expansion arc-shaped steel plate so as to block karst cave cracks of the pile hole wall. The main rod drives the staggered arc-shaped steel plates through the hinged dowel bar, and the main rod presses downwards to expand the steel plates in stages to form a closed annular sealed cabin; after expanding, the steel plate directly extrudes hole wall rock mass, a cement paste leakage channel is physically blocked, karst cave cracks are blocked in real time, and concrete loss is reduced; meanwhile, the steel plate exerts radial constraining force on the fractured rock mass, and hole collapse caused by construction disturbance is restrained; and plugging and lowering of the reinforcement cage are completed synchronously, and the pre-grouting construction period is shortened.

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 utility model discloses goaf grouting equipment for a deep-buried highway tunnel in a complex goaf section, which comprises a grouting equipment main body, the grouting equipment main body comprises a moving seat, one end of the upper surface of the moving seat is fixedly provided with a grouting pump through a mounting bolt, and the upper surface of the grouting pump is fixedly provided with a feeding box; by designing the material guiding protection mechanism, when the grouting equipment main body feeds materials into the feeding box during grouting, part of cement paste is splashed, the splashed cement paste falls into the surface of a material guiding protection shell and is directly guided and discharged to the outside through an inclined plane structure, and meanwhile, the cement paste is splashed on the outer surface of a protection plate to protect a distribution box; and the materials fall into the material guiding groove to be guided to the surface of the material guiding protection shell, and are guided to the outside through the material guiding protection shell, so that the main motor and the distribution box are subjected to anti-splashing protection during use, the protection effect on the outer surfaces of the main motor and the distribution box when the grouting equipment main body is used for grouting in the goaf of the deeply-buried highway tunnel is improved, and the service life is prolonged.