1101 results about "Well cementing" patented technology

The invention relates to a turbine flowmeter suitable for slurry flow measurement and a method for reducing abrasion, and belongs to the technical field of well cementation grouting metrology. The turbine flowmeter comprises a flow pipe body used for feeding formula slurry, and the periphery of the flow pipe body is connected with a plurality of detachable sensor seats; the two retainers are connected to the two ends of the flow pipe body respectively. The shaft sleeve is inserted into one end, facing the flow pipe body, of the retainer; the impeller shaft is inserted into the shaft sleeve and rotates in the shaft sleeve, and the impeller shaft and the flow pipe body are coaxially arranged; the impeller is coaxially connected with the impeller shaft; the technical problems that in the prior art, when a turbine flowmeter is used for mud flow measurement, precision is low, and abrasion resistance is poor can be solved.

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 invention discloses a multi-scale performance evaluation and optimization method and device for well cementation cement stone, and relates to the technical field of oil exploitation, the well cementation cement stone is subjected to nanoindentation test and scanning electron microscope microstructure test, and a mechanical property-microstructure test result is obtained; performing electronic computer tomography and mercury injection test on the well cementation cement stone, and constructing a pore network three-dimensional model; performing triaxial mechanical property test, thermogravimetric analysis and thermal expansion test on the well cementation cement stone to obtain a thermal-mechanical coupling test result; performing X-ray diffraction and X-ray fluorescence spectrum analysis on the well cementation cement stone to obtain mineral phase information and element information of the cement stone; according to the method, a mechanical property-microstructure test result, topological parameters, a thermal-mechanical coupling test result, cement stone mineral phase information and element information are fused, an optimal design scheme for target well conditions is generated, multi-dimensional performance testing and characterization are achieved, and an accurate basis is provided for well cementation cement stone optimal design and quality control.

The invention discloses a sliding sleeve opening and closing claw structure for oil and gas well half-way well cementation and an unlocking method, and belongs to the technical field of oil and gas exploitation, the sliding sleeve opening and closing claw structure comprises a casing string, a sliding sleeve, a slip assembly and an opening and closing claw assembly, an external groove is formed in the inner wall end of the casing string, the sliding sleeve is arranged in the external groove in a sliding mode, and the slip assembly comprises a front slip, a rear slip and a vacant groove; the front slip and the rear slip are coaxially arranged and fixedly connected, a vacant groove is formed between the front slip and the rear slip, and the switch claw assembly is movably arranged in the vacant groove and used for adjusting the position of the sliding sleeve in an external groove. The opening and closing states of the sliding sleeve in the casing string can be synchronously controlled, and when the sliding sleeve is clamped in the casing string, the built-in linkage structure can be used for automatic unlocking, so that the sliding sleeve assembly is prevented from being permanently clamped in the casing string.

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

The 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.

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 invention discloses a vibration-CO2 corrosion coupling effect real-time monitoring system and monitoring method for a well cementation cement sheath of an oil and gas well in a high-temperature and high-pressure environment. The system comprises a kettle system which is fixed with a base of an axial loading system, and a push rod of the axial loading system extends into the kettle system from the center of a kettle cover and is pressed on a detected body; the CT detection system is mounted below a jack supporting plate of the axial loading system; the electrolytic corrosion system is connected with the lower end of a first embedded axial pipeline on the side wall of a kettle body in the kettle system so as to apply an experimental environment; the gas pressurization system is divided into two paths, one path is led into the kettle system from the lower part, and the other path is connected with the lower end of the second embedded axial pipeline; a sleeve of the kettle system is fixed in the kettle system, the nondestructive testing system is installed in the middle of the sleeve, and the vibration system in the sleeve is installed on the lower portion of the sleeve. According to the invention, axial loading, gas pressurization and heating devices are integrated, and an underground high-temperature and high-pressure environment is simulated; and CT and ultrasonic waves cooperate to realize multi-dimensional dynamic monitoring of the corrosion process.

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.

The invention belongs to the technical field of geothermal energy development and utilization, and particularly relates to efficient extraction equipment for a deep geothermal exploitation well, which comprises a plurality of water pumping devices, the plurality of water pumping devices are sequentially communicated in series through a plurality of extension pipe fittings, and the water pumping device close to a wellhead is fixedly connected with a steel wire rope on hoisting equipment; the water pumping device comprises a water pumping mechanism, a well cementation assembly and a guide mechanism, the outer wall of the water pumping mechanism is sleeved with the well cementation assembly, the well cementation assembly is used for making friction contact with the well wall so as to keep the working position of the water pumping mechanism in a well, and the guide mechanism is arranged at the bottom end of the water pumping mechanism and used for guiding the water pumping mechanism to work. And the guide mechanism is used for smoothly lowering the water pumping mechanism into the well and keeping the water pumping mechanism coaxial with the well body. It is guaranteed that the water pumping mechanism is stably fixed in a well, smoothly lowered to the bottom of the well and always coaxially positioned with the well body, and the stability of extraction operation is improved.

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 discloses a construction method for salt cavern slim hole drilling cavity detection and injection and production well transformation. The construction method mainly comprises the six steps of cavity detection operation, packing operation, conduit operation, first-time reaming and well cementation, second-time reaming and well cementation and third-time open hole cavity penetrating operation. Compared with the prior art, the construction method for detecting the salt cavern slim-hole drilling cavity and transforming the injection and production well has the advantages that the drilling cost input is reduced, the working period is shortened, meanwhile, deflection and borehole wall instability are effectively avoided, and the construction safety is improved.

The utility model relates to the technical field of casing centralizers, in particular to an adjustable well cementation casing pipe expanding centralizer which comprises a fixing pipe, a lead screw is rotationally connected into the fixing pipe, a fixing disc is fixedly arranged at the top end of the lead screw, a reset spring is fixedly arranged at the bottom end of the fixing disc, and a rotating ring is fixedly arranged at the bottom end of the reset spring. The device has the advantages that the compression degree of the elastic piece can be adjusted by rotating the lead screw, so that the device can be used for well mouths with different diameters, the application range of the device is widened, the lead screw can be rapidly limited and unlimited, and the device is convenient to use and high in practicability. The screw rod is not easy to rotate when being placed, so that the elastic sheet has higher stability when being placed, the device is not easy to shake when moving in a wellhead, and the centralizing effect of the device on the oil well casing is improved.

The invention discloses a high-temperature well cementation cement expanding agent and a preparation method thereof, and belongs to the technical field of oil-gas well engineering well cementation materials. The high-temperature well cementation cement expanding agent is prepared from the following raw materials in parts by weight: 30-40 parts of dolomite; 10 to 20 parts of serpentine; 5 to 10 parts of hedenbergite; 5 to 10 parts of scolecite; 25-35 parts of slaked lime powder; 5-10 parts of quartz powder; the high-temperature well cementation cement expanding agent comprises the following chemical components in percentage by weight: more than 13wt.% and less than 23wt.% of MgO, more than 38wt.% and less than 55wt.% of CaO, more than 18wt.% and less than 32wt.% of SiO2, less than 3.5 wt.% of Al2O3 and less than 1wt.% of Fe2O3. The particle sizes of the high-temperature well cementation cement expanding agent are as follows: Dx (10) is less than or equal to 4 microns, Dx (50) is less than or equal to 10 microns, and Dx (90) is less than or equal to 20 microns. The invention also discloses a preparation method of the high-temperature well cementation cement expanding agent. Starting from cement main body minerals, through lattice solid solution, core-shell structure wrapping and other means, an expansion component and the hydration process of cement can achieve a synergistic reaction, and therefore the effective expansion effect is achieved in the cement gelling structure forming process.

The invention discloses a well cementation engineering digital process method and device, and the method comprises the steps: forming well cementation design basic data through employing a large model and an intelligent agent of a cloud end, and generating a preliminary well cementation design scheme; performing analogue simulation on the well cementation design scheme based on a mechanism model and an AI model, analyzing and checking the well cementation design scheme and a simulation result, performing iterative optimization and analogue simulation again on the well cementation design scheme according to a checking result until the well cementation design scheme passes analysis and checking, and pushing the well cementation design scheme to a field edge server; a construction operation system of the field edge server formulates an operation procedure and a flow instruction according to the operation procedure and the flow instruction and sends target well cementation operation parameters to a well cementation equipment control system for well cementation construction automatic control; and the construction operation system analyzes the field operation data and the potential operation risk by adopting an AI model, and dynamically optimizes the target well cementation operation parameters according to the analysis result. Intelligent design of the well cementation design scheme is achieved, and well cementation operation parameters can be dynamically optimized.

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.

A method of cementing a well includes injecting a cementitious mixture into a cased wellbore at a depth of at least 10,000 feet. The cementitious mixture is injected into an annulus between a casing and a wellbore wall. The method further includes curing the cementitious mixture to form a cured cement connecting the casing to the wellbore wall. The cementitious mixture includes a class G cement in an amount of 40 to 50 percent by weight (wt. %), water in an amount of 15 to 25 wt. %, a retarder in an amount of 0.5 to 1 wt. %, a dispersant in an amount of 0.05 to 0.2 wt. %, a fluid loss additive in an amount of 0.1 to 0.3 wt. %, a defoamer in an amount of 0.001 to 0.05 wt. %, a silica flour in an amount 10 to 20 wt. %, and magnetite in an amount of 10 to 20 wt. % where the wt. % is based on a total weight of the cementitious mixture.

The invention discloses a high-thermal-conductivity toughened composite material for deep geothermal development well cementation cement, and relates to the technical field of oil-gas field development well materials. The high-thermal-conductivity toughened composite material is prepared by spraying a modified composite high-thermal-conductivity material dispersion liquid on the surface of a modified fiber reinforced material, drying and mixing, and the mass ratio of the modified composite high-thermal-conductivity material dispersion liquid to the modified fiber reinforced material is (85-90): (10-15); the modified composite high-thermal-conductivity material dispersion liquid is prepared by mixing water, a modified composite high-thermal-conductivity material, nano cellulose fibers, xanthan gum and polycarboxylic acid; the modified fiber reinforced material is obtained by mixing carbon fibers and SiC whiskers and carrying out surface modification on the mixture. The thermal conductivity of set cement can be greatly improved, the heat transfer efficiency is high, the excellent engineering performance of well cementation cement slurry under the high-temperature environment condition of hot dry rocks can be achieved, and the engineering construction requirement is met.

The application discloses a method for controlling and managing casing deformation of an unconventional oil and gas well, which comprises the following steps: evaluating casing deformation risks existing in a single section of a gas well, and determining which casing deformation risks exist in the single section of the gas well, wherein the casing deformation risks include fault development, natural fracture development, microstructure development, frequent layer crossing, poor cementing quality and hole diameter expansion; and corresponding control methods are performed according to different types of risks. The application realizes effective control and management of casing deformation without carrying out geological modeling and fracturing simulation and without lowering high-cost monitoring instruments.

The invention relates to the technical field of petroleum engineering well cementation, and discloses a well cementation construction process of a highly-deviated well, which comprises the following steps of: cleaning an oscillating foundation, and stripping well wall pollutants by generating an oscillating effect through periodically changing circulating pressure and flow velocity; electrochemical synergistic cleaning is carried out, and organic pollutants are decomposed through the electrolysis effect; catalytic decomposition cleaning accelerates fracture of a mud cake polymer molecular chain; carrying out ion exchange treatment to change a pollutant charge distribution state; and a circulating purification step: removing reaction products in real time and recovering reaction conditions. Physical and chemical composite cleaning is achieved through the synergistic effect of multiple processes, highly-deviated well annulus pollutants are thoroughly removed, and the well cementation quality and the shaft sealing performance are remarkably improved.

The present application belongs to the technical field of underground filling of metal mines, and particularly relates to an iron tailings powder-based cementitious material for mine full tailings cemented filling, a preparation method and application thereof. The geopolymer-based anti-cracking mortar is made of iron tailings ultrafine powder, ore powder, sulphoaluminate clinker, Portland cement clinker, desulfurization gypsum and methyl cellulose ether. The iron tailings powder-based cementitious material can completely replace ordinary Portland cement in full tailings filling and achieve better cementing effect than cement, thereby greatly reducing the consumption of cement and other cementitious materials, lowering the filling cost, reducing carbon emissions and increasing the utilization rate of tailings. The rheological properties, mechanical properties and durability of the full tailings cemented filling material made of the iron tailings powder-based cementitious material can meet the requirements of mine filling, and the material can achieve the effect of expansion and roof contact without adding external additives, thereby solving the shrinkage problem of cement-based filling materials.

The invention provides a gelling composition, an alkali-activated gelling material and application. The gelling composition comprises a gelling material, an alkali activator and a retarder, wherein the retarder comprises any one or a combination of more than two of a homopolymer of a monomer A and a copolymer of the monomer A and a monomer B; the monomer A comprises an unsaturated carboxylic acid monomer; the monomer B comprises a polymerizable monomer containing a carbon-carbon double bond. The gelling composition provided by the invention can prolong the coagulation time of the alkali-activated gelling material on the premise of ensuring excellent mechanical properties. The invention also provides application of the polycarboxylic acid high-molecular compound in oil and gas well cementing cement.

The invention provides a casing well drilling well cementation-free tubular column and a construction method, the casing well drilling well cementation-free tubular column comprises a casing string, a drill bit is arranged at the lower end of the casing string, and the casing string replaces a drill rod to drive the drill bit to drill; the self-expansion packers are arranged in the axial direction of the casing string at intervals, can expand in the environment of an expanding agent and are fixed in the stratum; wherein the casing pipe string comprises a casing pipe without a coupling. By means of the self-adaptive expansion characteristic of the self-expansion packer, traditional cement well cementation is replaced, packing failure caused by cement performance fluctuation or casing welting is avoided, and the annulus sealing reliability is improved.

The invention discloses a wellhead device which comprises a tension four-way body and a tension casing hanger arranged in a main runner hole of the tension four-way body, and a casing string is connected to the bottom of the tension casing hanger. The tension four-way body is provided with at least two sets of tension mechanisms used for supporting a tension casing hanger and at least two sets of locking mechanisms used for locking the tension casing hanger. A locking groove and a bearing step face are sequentially arranged on the outer circle face of the tension sleeve hanger from top to bottom. The tension mechanism comprises a supporting seat installed on the side portion of the tension four-way body and a supporting rod movably arranged on the supporting seat, and the locking mechanism comprises a locking sleeve installed on the side portion of the tension four-way body and a locking rod movably arranged on the locking sleeve. After casing cement well cementation, the casing hanger is lifted upwards to enable a casing string to generate large axial tension, so that a casing does not vibrate and threads are not loosened when wellhead airflow is output, and the service life of the casing string and the wellhead is prolonged.

A cementing composition is flowed into an annulus between a tubular disposed within a wellbore formed in a subterranean formation and a wall of the wellbore. The cementing composition includes red mud, an epoxy resin, and a curing agent. The curing agent includes nitrogen. The curing agent crosslinks the epoxy resin to solidify the cementing composition, thereby cementing the tubular within the wellbore.

The invention discloses a resin well cementation method for a carbon dioxide injection well, which comprises the following steps of: calculating the annulus volume between a small-diameter casing string and an original well casing according to the specification parameters of the casing; a well killing hydraulic well is used, and after well killing is completed, the small-diameter casing string is lowered to the preset depth, and then a well mouth is installed; the method comprises the following steps: injecting a first solution into an annulus between a small-diameter casing string and an original well casing until well killing fluid in the annulus and the small-diameter casing is completely replaced by the first solution; after well killing fluid replacement is completed, a second solution with the same volume as the annulus volume is injected into the small-diameter casing string, the density of the second solution and the density of the first solution are close and both smaller than the density of the well killing fluid, the second solution and the first solution are different in color, and a high-strength carbon dioxide corrosion resistant resin slug is injected into the annulus pump; the technical problem of resin well cementation in the overflow state of the carbon dioxide injection well is solved.

The invention discloses early-strength compact anti-gas-channeling cement paste for well cementation and a preparation method thereof, and belongs to the technical field of well cementation materials. The early-strength compact anti-gas-channeling cement paste for well cementation comprises the following raw materials: 54-76 wt.% of superfine oil well cement; 5 to 10 wt.% of fly ash; 5 wt.% of silica fume; 5-10 wt.% of carbide slag; 5 to 12 wt.% of hollow glass beads; 3-6 wt.% of a composite early strength agent; 0.5 to 1.5 wt.% of a dispersant; and 0.5 to 1.5 wt.% of a fluid loss agent. The invention further discloses a preparation method of the early-strength compact anti-gas-channeling cement paste for well cementation. The early-strength compact anti-gas-channeling cement paste for well cementation shows excellent performance under a low-temperature condition, has the characteristics of rapid early strength increase, high final strength, short setting waiting time, compact set cement structure, outstanding anti-gas-channeling capability and the like, and is wide in density adjustment range and high in adaptability. The cement paste system disclosed by the invention can effectively meet multiple requirements on low-temperature adaptability, early strength and low-density performance in well cementation construction and subsequent mining processes in a low-temperature environment.

The invention discloses a high-performance well cementation cement system for deep geothermal development, and relates to the technical field of well cementation materials for oil and gas field development. The well cementation cement system is prepared from the following components in parts by weight: 100 parts of a cementing material, 35 to 40 parts of a high-temperature reinforcing material, 7 to 10 parts of a high-thermal-conductivity toughening composite material, 0.5 to 1.5 parts of a suspension stabilizer, 0.3 to 0.6 part of a dispersing agent, 1.5 to 2.5 parts of a fluid loss agent, 1.0 to 2.5 parts of a retarder and 0.1 part of a de-foaming agent, the solid-to-liquid ratio of the well cementation cement system is 0.40 to 0.50. The high-temperature stability, corrosion resistance and long-term durability of the set cement can be guaranteed, and the heat conductivity of the set cement can be greatly improved. The cement slurry has the characteristics of higher high-temperature strength, low high-temperature strength decline rate, lower elastic modulus, high heat transfer efficiency and the like, can realize excellent engineering performance of the well cementation cement slurry under the condition of a hot dry rock high-temperature environment, and meets the engineering construction requirements.