CN115572114B - Corrosion-resistant cement paste system for cementing of hydrogen sulfide-containing gas reservoir and preparation method thereof - Google Patents
Corrosion-resistant cement paste system for cementing of hydrogen sulfide-containing gas reservoir and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/32—Anticorrosion additives
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses an anti-corrosion cement paste system containing hydrogen sulfide for well cementation of a gas reservoir and a preparation method thereof. The anti-corrosion cement slurry system is characterized by comprising the following components in parts by weight: 60-70 parts of G-grade oil well cement; 30-40 parts of an anti-corrosion material; 10-15 parts of an anti-corrosion auxiliary reinforcing material; 0.5-2.5 parts of a fluid loss agent; 0.2-1.0 parts of dispersing agent; 0.1-0.3 part of retarder; 0.05-0.1 part of defoaming agent; the mass ratio of tap water to the grade G cement is 0.44:1. The cement slurry system can improve the compactness of the cement stone and improve the corrosion resistance of the cement stone in terms of blocking the migration passage of corrosive media and the composition of hydration products; a polymer film shielding layer can be formed, so that the corrosion resistance of the cement stone is enhanced in an auxiliary way from the aspect of isolating the cement stone from contact with a corrosion medium.
Description
Technical Field
The invention relates to an anti-corrosion cement slurry system for well cementation of a hydrogen sulfide-containing gas reservoir and a preparation method thereof, belonging to the field of oil-gas field development, drilling and completion well cementation engineering.
Background
The integrity of a first barrier of a well bore, namely a cementing cement sheath and the quality of cementing quality of the first barrier of the well bore are directly related to the production life of an oil-gas well bore, wherein the cementing operation of an acid gas reservoir is an important point and a difficult point in the cementing engineering, and is one of the technical problems in the petroleum engineering world.
The Hudous basin Olympic Mars ditch group stratum drill meets hydrogen sulfide, the lowest content is 18.29 ten thousand ppm, the highest content reaches 49 ten thousand ppm, the reservoir is high-pressure (stratum pressure coefficient is 1.61), the surface of the layer cementing cement ring is seriously threatened by high-temperature high-pressure high-acidity corrosion environment, the layer cementing cement ring is inevitably subjected to strong corrosion damage in the complex acid environment, the cement ring has the conditions of strength reduction, permeability increase, even interlayer isolation failure and the like, the structural integrity of a shaft is seriously damaged, and the production life of an oil-gas well is greatly shortened.
Therefore, the oil and gas reservoir development environment containing the hydrogen sulfide acid gas has higher requirements on the corrosion resistance and durability of the well cementite.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide an anti-corrosion cement paste system for cementing a hydrogen sulfide-containing gas reservoir and a preparation method thereof. The invention solves the problems of H-containing 2 S gas reservoir cementing cement sheath is subjected to acid medium H 2 And the permeability is increased after S corrosion, the mechanical property is greatly reduced, and the seal integrity is damaged or even fails.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the corrosion-resistant cement slurry system for cementing a hydrogen sulfide-containing gas reservoir is characterized by comprising the following components in parts by weight:
60-70 parts of G-grade oil well cement;
30-40 parts of an anti-corrosion material;
10-15 parts of an anti-corrosion auxiliary reinforcing material;
0.5-2.5 parts of a fluid loss agent;
0.2-1.0 parts of dispersing agent;
0.1-0.3 part of retarder;
0.05-0.1 part of defoaming agent;
the mass ratio of tap water to the grade G cement is 0.44:1.
The corrosion resistant material consists of 35 parts of phosphate cement, 15 parts of sulphoaluminate cement, 18 parts of magnetite and 32 parts of micro-silicon.
The phosphate cement and the sulphoaluminate cement pass through 120 mesh and do not pass through 140 mesh screens by 80%.
The magnetite 70% passed through a 140 mesh and not a 160 mesh screen.
The micro silicon passes through a 300-mesh screen in 95 percent, the amorphous silicon dioxide content in the micro silicon is more than 98 percent, and the crystalline silicon dioxide content is less than 1.6 percent.
The anti-corrosion auxiliary reinforcing material consists of 45 parts of no-SiO 2 The modified soap-free styrene-butadiene emulsion comprises 35 parts of modified waterborne epoxy resin emulsion, 10 parts of calcium sulfate whisker and 10 parts of silicon carbide whisker.
The no-SiO 2 The solid content of the modified soap-free styrene-acrylic emulsion is 60%, and the particle size is 134-143 nm.
The modified aqueous epoxy resin emulsion has a solid content of 70%, a particle size of 220-250 nm, and the epoxy resin is an E44 and E51 compound, and the compound mass ratio is 1:1.
The aspect ratio of the calcium sulfate whisker is between 20 and 50, and the silicon carbide whisker ratio is between 50 and 100.
The fluid loss agent is a polyethylene glycol fluid loss agent, the dispersing agent is an aldehyde ketone condensate dispersing agent, the retarder is a sodium phosphate and citric acid compound retarder, and the defoaming agent is a silicone oil defoaming agent.
The preparation method of the corrosion-resistant cement paste system for the well cementation of the hydrogen sulfide-containing gas reservoir is characterized by comprising the following steps of:
(1) Weighing an anti-corrosion auxiliary reinforcing material, a defoaming agent and tap water according to the weight parts of liquid phase components of a cement slurry system to form a mixed solution;
(2) Weighing the G-grade oil well cement, the anti-corrosion material, the dispersing agent, the fluid loss agent and the retarder according to the weight parts of the solid phase components of the cement slurry system, and dry-mixing to obtain a solid phase mixture;
(3) And (3) adding the solid phase mixture obtained in the step (2) into the mixed solution obtained in the step (1) at a low rotation speed of 4500+/-200 r/min for 15s, and continuously stirring for 35s at a high rotation speed of 14000+/-500 r/min to obtain the corrosion-resistant cement paste system for cementing the hydrogen sulfide-containing gas reservoir.
The invention has the advantages that:
1. according to the corrosion-resistant cement slurry system for cementing a hydrogen sulfide-containing gas reservoir, on one hand, the compactness of cement stones is improved through a corrosion-resistant material, a new-phase hydration product with low calcium-silicon ratio is generated through secondary hydration, and the corrosion resistance of the cement stones is improved in terms of blocking the migration passage of a corrosion medium and the composition of the hydration product; on the other hand, the polymer film shielding layer is formed by the anti-corrosion auxiliary reinforcing material, so that the anti-corrosion characteristic of the cement stone is assisted and enhanced from the aspect of isolating the cement stone from contact with the corrosion medium; the method utilizes the close packing principle and the pozzolan effect, combines the synergistic effect of physical corrosion prevention and chemical corrosion prevention, and improves the hydrogen sulfide corrosion resistance of the well cementation cement stone.
2. The corrosion-resistant cement paste system for cementing the hydrogen sulfide-containing gas reservoir is prepared from the corrosion-resistant material, the inert component and the active component, wherein the inert component and the active component are complemented, and the different components are complementary in particle size, so that not only can a good particle grading effect be easily formed with cement clinker, the compactness of cement paste is improved, but also the calcium-silicon ratio of the cement paste phase can be changed through the pozzolan effect of the active component, and the corrosion-resistant cement paste mainly comprising hydration products with low calcium-silicon ratio is formed.
3. The corrosion-resistant cement paste system for cementing a hydrogen sulfide-containing gas reservoir, disclosed by the invention, has a good film-forming shielding effect and a whisker 'bridging lacing wire' effect, and the anti-permeability and corrosion-resistant performances of cement stones are obviously improved.
4. The invention relates to an anti-hydrogen sulfide-containing gas reservoir well cementationCorroding a cement slurry system, wherein the cement stone is 1.5MPa H after 60 days 2 After the S partial pressure corrosion maintenance, the compressive strength decay rate is lower than 10.72 percent, the permeability growth rate is lower than 7.36 percent, and the composite material has good corrosion resistance and structural integrity.
Detailed Description
The following detailed description of the technical scheme of the present invention is provided for the purpose of understanding the technical features and advantageous results of the present invention more clearly. Examples 1-2 are two concrete cement paste preparation methods in an anti-corrosion cement paste system for cementing a hydrogen sulfide-containing gas reservoir, and examples 3-4 are evaluation of anti-corrosion performance of anti-corrosion cement stones for cementing a hydrogen sulfide-containing gas reservoir and comprehensive engineering performance of cement paste.
Example 1
Weighing 12 parts of corrosion-resistant auxiliary reinforcing material, 0.05 part of defoamer and 44 parts of tap water to form a mixed solution, and placing the mixed solution in a corrugated tank; weighing 70 parts of Jiahua grade G oil well cement, 30 parts of anti-corrosion material, 0.3 part of dispersing agent, 0.6 part of fluid loss agent and 0.10 part of retarder, and dry mixing to obtain a solid phase mixture; adding the solid phase mixture into the mixed solution of the corrugated tank at a low rotation speed of 4500+/-200 r/min for 15s, and continuously stirring at a high rotation speed of 14000+/-500 r/min for 35s to obtain the corrosion-resistant cement paste A for cementing the hydrogen sulfide-containing gas reservoir.
Example 2
15 parts of anti-corrosion reinforcing agent, 0.05 part of defoaming agent and 44 parts of tap water are weighed to form a mixed solution and placed in a corrugated tank; weighing 60 parts of Jiahua grade G oil well cement, 40 parts of anti-corrosion admixture, 0.5 part of dispersing agent, 1.0 part of fluid loss agent and 0.15 part of retarder, and dry mixing to obtain a solid phase mixture; adding the solid phase mixture into the mixed solution of the corrugated tank at a low rotation speed of 4500+/-200 r/min for 15s, and continuously stirring at a high rotation speed of 14000+/-500 r/min for 35s to obtain the corrosion-resistant cement paste B for cementing the hydrogen sulfide-containing gas reservoir.
Example 3
The anti-corrosion cement paste A and the anti-corrosion cement paste B for cementing the hydrogen sulfide-containing gas reservoir prepared in the examples 1-2 are placed in a high-temperature high-pressure curing kettle at 90 ℃/H 2 After continuous maintenance for 60 days in an environment with S partial pressure of 1.5MPa, the compression strength, the permeability and the likeThe corresponding rates of change are shown in table 1. The experimental results show that: at 90 ℃/H 2 After the continuous curing for 60 days in an environment with the S partial pressure of 1.5MPa, the compressive strength decay rates of the blank set cement, the A set cement and the B set cement are 44.56%, 8.18% and 7.63% respectively, and compared with the blank set cement, the decay rates of the A set cement and the B set cement are reduced by 36.38% and 36.93% respectively; the permeability increase rates of the blank set, the A set and the B set are 36.43%, 9.28% and 8.86%, respectively, and the decay rates of the A set and the B set are reduced by 27.15% and 27.57% respectively compared with the blank set. Therefore, the anti-corrosion cement slurry system prepared by the invention has good anti-corrosion performance and can effectively solve the problem of H-containing 2 S gas reservoir cementing cement sheath is subjected to acid medium H 2 And the permeability is increased after S corrosion, the mechanical property is greatly reduced, and the seal integrity is damaged or even fails.
Example 4
The comprehensive properties of the anti-corrosion cement paste A and B for cementing the hydrogen sulfide-containing gas reservoir formed by the invention are shown in the table 2, the API water evolution is 0mL, the API water loss is less than 42mL, the API standard is met, the fluidity ranges from 23 cm to 24cm, the rheological parameter n ranges from 0.81 to 0.85, and the consistency coefficient K ranges from 0.54 to 0.56. Therefore, the cement slurry system has good flowing rheological property, excellent sedimentation stability and good comprehensive engineering performance, and completely meets the basic requirements of on-site cementing construction.
Table 1 changes in compressive strength and permeability of corrosion-resistant set cement for cementing hydrogen sulfide bearing reservoirs
Table 2 comprehensive Properties of corrosion-resistant Cement slurries for cementing hydrogen sulfide-containing gas reservoirs
Example 5
An anti-corrosion cement slurry system suitable for cementing a hydrogen sulfide-containing gas reservoir is composed of the following components in parts by weight:
60-70 parts of G-grade oil well cement, and preferably Jiahua G-grade oil well cement;
30-40 parts of an anti-corrosion material;
10-15 parts of an anti-corrosion auxiliary reinforcing material;
0.5-2.5 parts of a fluid loss agent;
0.2-1.0 parts of dispersing agent;
0.1-0.3 part of retarder;
0.05-0.1 part of defoaming agent;
the balance is tap water, and the mass ratio of the tap water to the Jiahua class G cement is 0.44:1.
The corrosion resistant material consists of 35 parts of phosphate cement, 15 parts of sulphoaluminate cement, 18 parts of magnetite and 32 parts of micro-silicon, wherein 80% of the phosphate cement and the sulphoaluminate cement pass through a 120-mesh screen and do not pass through a 140-mesh screen, 70% of the magnetite pass through a 140-mesh screen and do not pass through a 160-mesh screen, 95% of the micro-silicon passes through a 300-mesh screen, the amorphous silicon dioxide content in the micro-silicon is more than 98%, and the crystalline silicon dioxide content is less than 1.6%.
The anti-corrosion auxiliary reinforcing material consists of 45 parts of no-SiO 2 The no-SiO modified waterborne epoxy resin emulsion comprises modified soap-free butylbenzene emulsion, 35 parts of modified waterborne epoxy resin emulsion, 10 parts of calcium sulfate whisker and 10 parts of silicon carbide whisker, wherein no-SiO is prepared from the components of the no-SiO modified waterborne epoxy resin emulsion 2 The solid content of the modified soap-free styrene-acrylic emulsion is 60%, and the particle size is 134-143 nm; the solid content of the modified aqueous epoxy resin emulsion is 70%, the particle size is 220-250 nm, the epoxy resin is E44 and E51 compound, and the compound mass ratio is 1:1; the aspect ratio of the calcium sulfate whisker is 20-50, and the silicon carbide whisker ratio is 50-100.
The fluid loss agent is a polyethylene glycol fluid loss agent, preferably G409F1; the dispersing agent is aldehyde ketone condensate dispersing agent, preferably SXY; the retarder is a retarder of a compound of sodium phosphate and citric acid, and G407R1 is preferable; the defoamer is silicone oil defoamer, preferably D50; these are all commercial product models.
The invention also provides a preparation method of the anti-corrosion cement paste system for cementing the hydrogen sulfide-containing gas reservoir, which comprises the following preparation steps:
(1) Weighing an anti-corrosion auxiliary reinforcing material, a defoaming agent and tap water according to the weight parts of liquid phase components of a cement slurry system to form a mixed solution, and placing the mixed solution in a corrugated tank;
(2) Weighing the Jiahua G-level oil well cement, the anti-corrosion material, the dispersing agent, the fluid loss agent and the retarder according to the weight parts of the solid phase components of the cement slurry system, and dry-mixing to obtain a solid phase mixture;
(3) And (3) adding the solid phase mixture obtained in the step (2) into the mixed solution obtained in the step (1) at a low rotation speed of 4500+/-200 r/min for 15s, and continuously stirring for 35s at a high rotation speed of 14000+/-500 r/min to obtain the corrosion-resistant cement paste for cementing the hydrogen sulfide-containing gas reservoir.
Claims (8)
1. The corrosion-resistant cement slurry system for cementing a hydrogen sulfide-containing gas reservoir is characterized by comprising the following components in parts by weight:
60-70 parts of G-grade oil well cement;
30-40 parts of an anti-corrosion material;
10-15 parts of an anti-corrosion auxiliary reinforcing material;
0.5-2.5 parts of a fluid loss agent;
0.2-1.0 parts of dispersing agent;
0.1-0.3 part of retarder;
0.05-0.1 part of defoaming agent;
tap water and the mass ratio of tap water to grade G cement is 0.44:1;
the corrosion-resistant material consists of 35 parts of phosphate cement, 15 parts of sulphoaluminate cement, 18 parts of magnetite and 32 parts of micro-silicon; the anti-corrosion auxiliary reinforcing material consists of 45 parts of no-SiO 2 The modified soap-free styrene-butadiene emulsion comprises 35 parts of modified waterborne epoxy resin emulsion, 10 parts of calcium sulfate whisker and 10 parts of silicon carbide whisker.
2. The corrosion resistant cement slurry system for hydrogen sulfide-containing gas reservoir cementing of claim 1, wherein: 80% of the phosphate cement and the sulphoaluminate cement pass through a 120-mesh screen and do not pass through a 140-mesh screen; magnetite 70% passed through 140 mesh and not 160 mesh screen.
3. The corrosion resistant cement slurry system for hydrogen sulfide-containing gas reservoir cementing of claim 2, wherein: the micro silicon passes through a 300-mesh screen in 95 percent, the amorphous silicon dioxide content in the micro silicon is more than 98 percent, and the crystalline silicon dioxide content is less than 1.6 percent.
4. A hydrogen sulfide containing corrosion resistant cement slurry system for well cementing in a gas reservoir according to claim 3, wherein: the no-SiO 2 The solid content of the modified soap-free styrene-acrylic emulsion is 60%, and the particle size is 134-143 nm.
5. The corrosion resistant cement slurry system for hydrogen sulfide-containing gas reservoir cementing of claim 4, wherein: the modified aqueous epoxy resin emulsion has a solid content of 70%, a particle size of 220-250 nm, and the epoxy resin is an E44 and E51 compound, and the compound mass ratio is 1:1.
6. The corrosion resistant cement slurry system for hydrogen sulfide-containing gas reservoir cementing of claim 5, wherein: the aspect ratio of the calcium sulfate whisker is between 20 and 50, and the silicon carbide whisker ratio is between 50 and 100.
7. The corrosion resistant cement slurry system for hydrogen sulfide-containing gas reservoir cementing of claim 6, wherein: the fluid loss agent is a polyethylene glycol fluid loss agent, the dispersing agent is an aldehyde ketone condensate dispersing agent, the retarder is a sodium phosphate and citric acid compound retarder, and the defoaming agent is a silicone oil defoaming agent.
8. The method for preparing the corrosion-resistant cement paste system for cementing a hydrogen sulfide-containing gas reservoir according to claim 1, comprising the following steps:
(1) Weighing an anti-corrosion auxiliary reinforcing material, a defoaming agent and tap water according to the weight parts of liquid phase components of a cement slurry system to form a mixed solution;
(2) Weighing the G-grade oil well cement, the anti-corrosion material, the dispersing agent, the fluid loss agent and the retarder according to the weight parts of the solid phase components of the cement slurry system, and dry-mixing to obtain a solid phase mixture;
(3) And (3) adding the solid phase mixture obtained in the step (2) into the mixed solution obtained in the step (1) at a low rotation speed of 4500+/-200 r/min for 15s, and continuously stirring for 35s at a high rotation speed of 14000+/-500 r/min to obtain the corrosion-resistant cement paste system for cementing the hydrogen sulfide-containing gas reservoir.
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