889 results about "Well cementing" 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 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 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.

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 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 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 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 relates to the technical field of petroleum and natural gas well cementation, in particular to a well cementation floating device with a turbulence function, and aims to solve the problem that cement is easy to settle at the bottom of a casing during horizontal well cementation operation by a wet shoe method. The device comprises a main body, a turbulence assembly and a valve assembly, two ends of the main body are through; the turbulence assembly and the valve assembly are arranged in the main body; the turbulence assembly is communicated with the valve assembly; the turbulence assembly comprises a turbulence pipe; the turbulent flow pipe is provided with a first port and a second port; the first port is arranged at the upper end of the turbulence pipe, and the second port is arranged at the lower end of the turbulence pipe; spiral blades are arranged in the turbulent flow pipe; the first port and the second port are communicated up and down to form a turbulent flow channel. According to the scheme, through cooperation of the turbulence assembly and the valve assembly, the flowing effect of the bottom can be enhanced, sediments such as cement at the bottom can be effectively scoured, and blockage is avoided; and meanwhile, the wet shoe channel can be replaced in the fracturing operation, and the construction efficiency is improved.

A wellhead system includes a wellhead housing and a hanger configured to support a casing within the wellhead housing. The hanger includes one or more passages formed through the hanger. The wellhead system also includes a seal assembly configured to move relative to the hanger to selectively enable a flow of fluid across the hanger via the one or more passages. The hanger, the seal assembly, and a lock ring may be run together into the wellhead housing.

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 threaded connection of oil casings, in particular to a basically flush type coupling-free air-tight seal oil casing joint assembly which comprises an external thread joint and an internal thread joint, and after the external thread joint and the internal thread joint are screwed together, the external thread joint and the internal thread joint are screwed together. An outer metal sealing structure, an outer elastic sealing structure, meshing threads, an inner elastic sealing structure, an inner metal sealing structure, a torque shoulder and the like are sequentially formed. Through the cooperation of the external thread connector, the internal thread connector, the external metal sealing structure, the external elastic sealing structure, the meshing thread and the internal metal sealing structure, the connecting and sealing functions are provided, the connector is basically flush with the pipe body, the oil casing can enter a well easily, the well cementation gap is large, and the connector connecting efficiency can reach 65%-70%; and 2) the inner and outer seals are both metal / metal seal and elastic seal, and the double-seal structure greatly improves the sealing effect, and is suitable for ultra-deep wells and high-pressure natural gas wells with harsh conditions.

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 invention belongs to the field of cement paste for well cementation of oil and gas wells, and particularly relates to medium-high temperature anti-gas channeling cement paste. The medium-high temperature anti-gas channeling cement paste comprises water and the following raw materials in parts by weight: 100 parts of oil well cement, 35-40 parts of a high-temperature strength stabilizer and 2-3 parts of an anti-gas channeling agent, the high-temperature strength stabilizer is prepared from SiO2 with the particle size of 75 to 100 mu m, SiO2 with the particle size of 23 to 38 mu m and SiO2 with the particle size of 0.1 to 10 mu m according to the mass ratio of 10 to (20 to 21) to (1.2 to 1.5); the anti-gas channeling agent is a copolymer of 2-acrylamide-2-methylpropanesulfonic acid, acrylamide and N, N '-dimethylacrylamide. The cement paste disclosed by the invention has relatively high fluidity, relatively good defoaming property, relatively high gas channeling prevention performance and relatively high high-temperature stability, has relatively high strength and gas channeling prevention performance after well cementation, can prevent the gas channeling problem of well cementation, and improves the well cementation quality.

The present application relates to the field of oil well cementing, in particular to a adjustable casing centralizer and method. The technical scheme is: the lower end of the first centralizer center pipe is connected with the second centralizer center pipe through the universal butt joint, the first centralizer sleeve is arranged below the first centralizer baffle, and the first outer joint sleeve is arranged between the first centralizer sleeve and the outer convex part of the universal butt joint; the second centralizer baffle is arranged on the outer side of the lower part of the second centralizer center pipe, the second centralizer sleeve is arranged on the upper side of the second centralizer baffle, the second outer joint sleeve is arranged between the second centralizer sleeve and the outer convex part of the universal butt joint, and a plurality of centralizer roller groups are installed on the outer walls of the first centralizer sleeve and the second centralizer sleeve. The present application not only has the centralizing function, but also makes the universal rotation spherical surface of the centralizer center pipe rotate around the outer joint sleeve spherical inner wall of the outer joint sleeve to form adjustable movable connection between every two groups of casings, so that the problems such as damage to the wellbore or resistance to casing running are avoided.

The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a pulse rotational flow well cementation oscillator and a using method thereof. The pulse rotational flow well cementation oscillator comprises a shell, the bottom of the shell is rotationally connected with a guide shoe cap, an installation disc is arranged in the shell, the top of the installation disc is provided with a piston cylinder, the upper end of the piston cylinder is open, the piston cylinder and the shell form an annulus, the installation disc is provided with an inclined rotational flow hole communicated with the annulus, and an upper side hole communicated with the annulus is formed in the upper portion of the side wall of the piston cylinder. The bottom of the rotating shaft rotatably penetrates through the piston cylinder and the mounting disc, an upper turntable hydraulically driven to rotate is arranged at the top of the rotating shaft, a first inclined hole communicated with the piston cylinder and a second inclined hole communicated with the annulus are formed in the upper turntable, the rotating shaft is connected with the piston through a cam mechanism, and when the rotating shaft rotates, the piston vertically ascends and descends along the piston cylinder to block or unblock the upper side hole. Through the combination of pulse agitation and rotational flow, the uniform distribution degree of well cementation liquid and the well cementation quality are greatly improved, the eccentric guide shoe cap is rotationally connected with the shell, and the tripping-in efficiency of a well cementation pipe string can be improved.

1. The name of the design product: three-cylinder piston pump. 2. The use of the design product: the pump is used for intermittent oil well operation, such as acidification, well cementing, fracturing, well killing, gravel packing and the like. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The invention provides novel salt-cavern hydrogen storage well shaft cement as well as a preparation method and application thereof. The novel salt-cavern hydrogen storage well shaft cement is prepared from cement, reinforced fibers, a filling material, clay, a water reducing agent and tap water, wherein the filling material is selected from one or more of fly ash, siliceous lime powder or quartz powder; the micron material is selected from one or more of micron clay, micron silica or carbon nanotubes. According to the formula of the novel salt-cavern hydrogen storage well shaft cement, the reinforced fibers, the filling material, the micron material and the water reducing agent are especially added, the advantages of all the components are fully played, all the components cooperate and interact with one another, and therefore the novel salt-cavern hydrogen storage well shaft cement has the advantages of low permeability, high mechanical strength and good crack resistance and chemical stability; and particularly, in a severe geological environment, the corrosion resistance is relatively high, so that the comprehensive performance is relatively excellent.

The invention discloses a nano SiO2 composite iron microsphere toughening agent for well cementation cement, and belongs to the technical field of petroleum and natural gas well cementation engineering materials. The preparation method of the flexibilizer comprises the following steps: adding ferric trichloride into ethylene glycol, and stirring and dissolving at normal temperature to obtain a solution A; the preparation method comprises the following steps: adding polyvinylpyrrolidone into ethylene glycol, stirring and dissolving at a certain temperature to obtain a solution B, and then adding sodium citrate to prepare a solution C; tetraethoxysilane is added into deionized water and then mixed with the solution A, a hydrolysis reaction of tetraethoxysilane is carried out, and a solution D with nano SiO2 is prepared; gradually and slowly dropwise adding the solution D into the solution C at a certain temperature, and carrying out a first oxidation-reduction reaction; cooling to room temperature, adding sodium borohydride, and carrying out a second oxidation-reduction reaction; and filtering, washing and drying the solution to obtain the flexibilizer. The cement stone is endowed with high toughness and compressive strength through the synergistic effect of the iron elementary substance and the nano SiO2, and the cement stone has a wide market prospect.

The utility model provides an accumulated water discharge pipeline for a double-pump well cementation pry, which belongs to the technical field of oilfield exploitation, and comprises a double-pump well cementation pry body and a separator connected with the double-pump well cementation pry body, the separator is used for separating solid particles and liquid in slurry, the separator is connected with a pipeline discharge assembly, and the pipeline discharge assembly is used for discharging the accumulated water in the double-pump well cementation pry body. The pipeline discharging assembly comprises a pipeline body and a turning cover, one end of the pipeline body is fixedly connected with the separator, the other end of the pipeline body is rotationally connected with the turning cover through an opening and closing assembly, the turning cover is used for limiting outflow of accumulated water, and the opening and closing assembly is used for controlling the discharging frequency of the accumulated water. An oil cylinder and a fixing supporting rod are fixedly connected to the wall beside the pipeline body, and the oil cylinder is fixedly connected with the linkage assembly. The separator can solve the problem that equipment is damaged due to the fact that a large amount of water is drained at a time when an existing separator is used for draining water.

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.

The invention provides a foaming composition for cement and foamed cement containing the foaming composition. Foamed cement containing the foaming composition for cement is used as hot dry rock heat preservation well cementation cement, heat loss can be effectively reduced, the requirements for stability, toughness and corrosion resistance under the high-temperature condition can be met, and good application prospects are achieved.