CN111018410A - Cement paste system and preparation method thereof - Google Patents
Cement paste system and preparation method thereof Download PDFInfo
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- CN111018410A CN111018410A CN201811171792.3A CN201811171792A CN111018410A CN 111018410 A CN111018410 A CN 111018410A CN 201811171792 A CN201811171792 A CN 201811171792A CN 111018410 A CN111018410 A CN 111018410A
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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
- 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
- C09K8/48—Density increasing or weighting additives
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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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
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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
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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
- C04B2201/50—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
- C09K2208/10—Nanoparticle-containing well treatment fluids
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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 provides a cement paste system and a preparation method thereof. The cement slurry system comprises raw materials of G-grade oil well cement, a high-temperature resistant elastic material, a high-temperature resistant fluid loss agent, a high-temperature resistant inorganic anti-channeling emulsion, a weighting agent, a high-temperature strength stabilizer, a dispersing agent, a slurry regulator, a retarder and water. The cement sheath formed in the large-scale fracturing construction process in the high-temperature and high-pressure environment and the later stage by using the cement slurry system has better elastic performance, can keep self integrity for a long time, effectively ensures interlayer sealing, and reduces the risk of annulus pressure of the shale gas well.
Description
Technical Field
The invention provides a cement slurry system and a preparation method thereof, in particular to a high-temperature-resistant high-density cement slurry system suitable for deep shale gas well cementing.
Background
In recent years, shale gas exploration and development are deepened continuously, and deep shale gas exploration and development technology becomes a research focus.
Deep shale gas generally has geological characteristics such as high temperature, high density and the like, and is a great challenge to the existing drilling and completion technology, particularly the well cementation technology.
The basic performance of the existing high-temperature-resistant and high-density well cementation cement slurry can meet the construction requirements, but the requirements of shale gas target layer well cementation construction are considered, sufficient elastic materials are not added into the existing cement slurry system, a cement ring cannot keep good elastic performance, and the cement ring is easy to damage in the later large-scale fracturing construction process and loses the effect of sealing the annular space.
Disclosure of Invention
The invention provides a cement slurry system, which comprises G-grade oil well cement, a high-temperature resistant elastic material, a high-temperature resistant fluid loss agent, a high-temperature resistant inorganic anti-channeling emulsion, a weighting agent, a high-temperature strength stabilizer, a dispersing agent, a slurry regulator, a retarder and water.
In a specific embodiment, based on 100 parts by mass of G-grade oil well cement, the high-temperature resistant elastic material is 4-8 parts, the high-temperature resistant fluid loss additive is 4-6 parts, the high-temperature resistant inorganic anti-channeling emulsion is 5-10 parts, the weighting agent is 60-90 parts, the high-temperature strength stabilizer is 30-60 parts, the dispersing agent is 0.8-1 part, the slurry regulator is 0.8-1 part, the retarder is 1-2 parts, and the water is 55-59 parts.
In one embodiment, the high temperature resistant elastic material is a nano silicon-rubber composite particle with a nano silicon shell and a rubber core. The rubber therein may be, for example, tire waste.
In one embodiment, the nano silicon-rubber composite particles are formed by wrapping the rubber particles with the average particle size of 140-180 meshes by the nano silicon with the average particle size of 100-300 nm.
In one embodiment, the nano-silicon-rubber composite particles are prepared using a particle composite system encapsulation process technique.
In one embodiment, the preparation method of the nano silicon-rubber composite particle comprises the following steps: adding rubber particles and nano-silicon into a mixer of a particle compounding system in proportion, adjusting experimental process parameters of a quantitative metering system to ensure that the nano-silicon and the rubber particles are fully contacted and mixed, and finally collecting the obtained powder under the control of a control system to form a core-shell structure of the nano-silicon coated rubber particles.
In one embodiment, the high temperature fluid loss additive is an AMPS (2-acrylamido-2-methylpropanesulfonic acid) multipolymer, wherein the raw materials for preparing the AMPS multipolymer comprise: 100 parts by mass of water, 40 to 80 parts by mass of 2-acrylamido-2-methylpropanesulfonic acid, 1 to 30 parts by mass of 3-allyloxy-2-hydroxy-1-propanesulfonic acid, 30 to 70 parts by mass of N' N-dimethylacrylamide, 1 to 20 parts by mass of acrylic acid, 1 to 20 parts by mass of acrylonitrile.
In one embodiment, the step of preparing the AMPS multipolymer is as follows: adding 40 to 80 parts by mass of 2-acrylamido-2-methylpropanesulfonic acid, 1 to 30 parts by mass of 3-allyloxy-2-hydroxy-1-propanesulfonic acid, 30 to 70 parts by mass of N' N-dimethylacrylamide, 1 to 20 parts by mass of acrylic acid, and 1 to 20 parts by mass of acrylonitrile to 100 parts by mass of water, stirring to dissolve, then adjusting the pH of the solution to 6 to 7, followed by holding at 60 to 75 ℃ for 1 to 1.5 hours under an inert atmosphere; then adding an initiator under the stirring state, continuously reacting under the stirring state at the temperature of between 60 and 75 ℃, and cooling to room temperature (for example, naturally cooling to 25 +/-5 ℃) to obtain the high-temperature-resistant fluid loss agent; wherein the initiator comprises an oxidizing agent and a reducing agent; the amount of the oxidizing agent is 0.1 to 0.3 part by mass based on 100 parts by mass of the water; the amount of the reducing agent is 0.1 to 0.3 part by mass; the oxidant is ammonium persulfate, and the reducing agent is sodium bisulfite.
In one embodiment, the high temperature resistant inorganic anti-channeling emulsion is a nano-silica emulsion.
In one embodiment, the weighting agent is iron ore fines having a particle size of 100 to 150 mesh.
In one embodiment, the dispersant is an aldehyde ketone polycondensate.
In one embodiment, the slurry conditioner is sodium silicate.
In one embodiment, the retarder is acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer.
In one embodiment, the high temperature strength stabilizer is silicon powder with a purity of greater than 95% and a particle size of 60 to 100 mesh.
In one embodiment, the cement slurry system has a density of 2 to 2.5g/cm3。
The second aspect of the invention provides a method for preparing a cement slurry system according to any one of the first to third aspects of the invention, comprising the steps of:
1) uniformly mixing the pure cement of the G-grade oil well, a weighting agent, a high-temperature strength stabilizer and a high-temperature resistant elastic material to obtain large sample ash;
2) adding the high-temperature-resistant fluid loss agent, the high-temperature-resistant inorganic anti-channeling emulsion, the dispersing agent, the slurry regulator and the retarder into water, and uniformly mixing to obtain large-scale water;
3) and pouring the large sample ash into the large sample water, and uniformly mixing (for example, uniformly mixing by stirring) to obtain the cement paste system.
In a specific embodiment, the large sample ash obtained in step 1) is stored in a closed container for use within 5 days before construction.
The invention has the beneficial effects that:
the cement paste system has the characteristics of low dosage of high-temperature resistant elastic materials and high-temperature resistant fluid loss additives, and simultaneously has the characteristic of high temperature resistance (such as 130-180 ℃), and in addition, the cement paste system has higher density which can reach 2-2.5 g/cm3. The cement stone (which can represent a cement sheath in actual working conditions) prepared under corresponding high-temperature and high-pressure curing has good elastic modulus which can be as low as 5GPa, and can completely meet the requirement of the prior deep layerThe shale gas well cementing construction scheme is less than the requirement of 6 GPa. The integrity of the cement sheath can be well guaranteed in the later-stage large-scale fracturing construction process, the purpose of effective interlayer packing is achieved, the annulus pressure risk of the shale gas well is reduced, and the shale gas interlayer packing capacity is guaranteed. In addition, the cement paste system has enough compressive strength, for example, the compressive strength of the set cement is more than 18MPa/7d, and the compressive strength of 60d at 200 ℃ is more than 30 MPa.
A large number of indoor experiments verify that the high-density cement paste system has good rheological property and good sedimentation stability under the high-temperature experiment condition, and the difference of the upper density and the lower density of cement paste meeting the requirements of a construction scheme is less than 0.06g/cm3. Meanwhile, the lowest water loss of the cement paste system is 34mL under the high-pressure high-temperature experimental condition, the water loss is less than 50mL which completely meets the requirements of a construction scheme, and the cement paste system has zero water separation and high fluidity.
According to the field construction reflection, the cold mortar has better rheological property and good pumpability in the mortar stirring process, the field test density is consistent with the design density, and the requirements of field construction are met.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary of the invention and are not to be construed as limiting the invention in any way.
The starting materials used in the examples are all commercially available unless otherwise specified.
Unless otherwise specified, the high temperature resistant elastic material used in each of the examples and comparative examples of the present invention was SFP-1, which is a nano silicon-rubber composite particle, available from continental shelf petroleum engineering, texas, and the preparation method thereof included the steps of: rubber particles with the average particle size of 160 meshes and nano-silicon with the average particle size of 200nm are added into a mixer of a particle composite system according to a certain proportion, experimental process parameters of a quantitative metering system are adjusted, so that the nano-silicon and the rubber particles are fully contacted and mixed in a host, and finally powder is obtained in a collecting device under the control of a control system, so that a core-shell structure of the micro-silicon coated rubber particles is formed.
The grade G oil well cement used in the examples and comparative examples of the present invention was a grade Caragana grade G sulfate-resistant oil well cement purchased from Caragana Sichuan cement plants, unless otherwise specified.
Unless otherwise specified, the weighting agent used in each example and comparative example of the present invention was iron ore powder having a particle size of 120 mesh.
Unless otherwise specified, the high temperature resistant inorganic anti-channeling emulsions used in the examples and comparative examples of the present invention were nano-silica emulsions, available from SCLS of continental shelf oil engineering, Inc. of Texas.
Unless otherwise specified, the high temperature fluid loss additives used in the examples and comparative examples of the present invention were AMPS multipolymers available from SCF200L, Dacron, Tex, Petroleum engineering, Inc.
Unless otherwise specified, the retarder used in the examples and comparative examples of the present invention was acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer available from SCR-3 of continental shelf oil engineering, Tex.
Unless otherwise specified, the dispersants used in the examples and comparative examples of the present invention were aldehyde ketone polycondensates available from DZS from continental shelf oil engineering, ltd, texas.
Unless otherwise specified, the slurry conditioner used in the examples and comparative examples of the present invention was sodium silicate, available from H-18 of continental shelf oil engineering, Tex.
Unless otherwise specified, the high-temperature strength stabilizers used in the examples and comparative examples of the present invention were silicon powders having a purity of more than 95% and a particle size of 80 mesh.
Example 1
(1) 100 parts by mass of pure cement of the G-grade oil well, 60 parts by mass of weighting agent, 30 parts by mass of high-temperature strength stabilizer and 4 parts by mass of high-temperature resistant elastic material are dry-mixed and uniformly stirred to form large sample ash which is stored and put in a closed ash can for use.
(2) 4 parts by mass of high-temperature-resistant fluid loss additive, 5 parts by mass of high-temperature-resistant inorganic anti-channeling emulsion, 0.8 part by mass of dispersing agent, 0.8 part by mass of slurry regulator and 1 part by mass of retarder are added into 55 parts by mass of field water, and the mixture is fully circulated to ensure that the additive is completely dissolved and uniformly mixed to form large sample water, so that the construction and use can be carried out.
(3) And pouring the large sample ash into the large sample water, and fully and uniformly stirring to form the high-density cement slurry suitable for shale gas cementing.
The amounts of the components are shown in Table 1.
Example 2
(1) 100 parts by mass of pure cement of the G-grade oil well, 70 parts by mass of weighting agent, 40 parts by mass of high-temperature strength stabilizer and 5 parts by mass of elastic material are dry-mixed and uniformly stirred to form large sample ash which is stored and put in a closed ash tank for use.
(2) Adding 4 parts by mass of fluid loss additive, 6 parts by mass of high-temperature-resistant inorganic anti-channeling emulsion, 1 part by mass of dispersing agent, 0.8 part by mass of slurry regulator and 1.2 parts by mass of retarder into 57 parts by mass of field water, and fully circulating to ensure that the additive is completely dissolved and uniformly mixed to form large sample water, thus being capable of being constructed and used.
(3) And pouring the large sample ash into the large sample water, and fully and uniformly stirring to form the high-density cement slurry suitable for shale gas well cementation.
The amounts of the components are shown in Table 1.
Example 3
(1) 100 parts by mass of pure cement of the G-grade oil well, 78 parts by mass of weighting agent, 50 parts by mass of high-temperature strength stabilizer and 6 parts by mass of elastic material are dry-mixed and uniformly stirred to form large sample ash which is stored and put in a closed ash tank for use.
(2) Adding 5 parts by mass of fluid loss additive, 7 parts by mass of high-temperature-resistant inorganic anti-channeling emulsion, 1 part by mass of dispersing agent, 1 part by mass of slurry regulator and 2 parts by mass of retarder into 59 parts by mass of field water, and fully circulating to ensure that the additive is completely dissolved and uniformly mixed to form large sample water, thus being capable of being constructed and used.
(3) And pouring the large sample ash into the large sample water, and fully and uniformly stirring to form the high-density cement slurry suitable for shale gas cementing.
The amounts of the components are shown in Table 1.
Example 4
(1) 100 parts by mass of pure cement of the G-grade oil well, 85 parts by mass of weighting agent, 60 parts by mass of high-temperature strength stabilizer and 7 parts by mass of elastic material are dry-mixed and uniformly stirred to form large sample ash which is stored and put in a closed ash tank for use.
(2) 6 parts by mass of fluid loss additive, 9 parts by mass of high-temperature-resistant inorganic anti-channeling emulsion, 1 part by mass of dispersant, 0.8 part by mass of slurry regulator and 2 parts by mass of retarder are added into 57 parts by mass of field water, and the mixture is fully circulated to ensure that the additive is completely dissolved and uniformly mixed to form large sample ash, so that the construction and use can be carried out.
(3) And pouring the large sample ash into large sample water, and fully and uniformly stirring to form the high-density cement slurry suitable for shale gas cementing.
The amounts of the components are shown in Table 1.
Example 5
(1) 100 parts by mass of pure cement of the G-grade oil well, 90 parts by mass of weighting agent, 60 parts by mass of high-temperature strength stabilizer and 8 parts by mass of elastic material are dry-mixed and uniformly stirred to form large sample ash which is stored and put in a closed ash tank for use.
(2) 6 parts by mass of fluid loss additive, 10 parts by mass of high-temperature-resistant inorganic anti-channeling emulsion, 1 part by mass of dispersant, 1 part by mass of slurry regulator and 2 parts by mass of retarder are added into 59 parts by mass of field water, and the mixture is fully circulated to ensure that the additive is completely dissolved and uniformly mixed to form large sample water, so that the construction and use can be realized.
(3) And pouring the large sample ash into large sample water, and fully and uniformly stirring to form the high-density cement slurry suitable for shale gas cementing.
The amounts of the components are shown in Table 1.
Comparative example 1
The procedure of example 1 was repeated except that the amount of the fluid loss control agent was 3.5 parts by mass.
The amounts of the components are shown in Table 1.
Comparative example 2
The same procedure as in example 5 was repeated except that the elastic material was added in an amount of 3 parts by mass.
The amounts of the components are shown in Table 1.
TABLE 1
Example 6
Performance testing
The cement slurries prepared in examples 1 to 5 and comparative examples 1 and 2 were tested for their properties according to the oil well cement test method (GB19139-2012), and the specific performance results are shown in table 2.
TABLE 2 high temperature resistant high density elasto-tough cement slurry system performance
As can be seen from table 2, the cement slurry shear stress readings in examples 1 to 5 are good, and no reading greater than 300 appears, which indicates that the cement slurry fluidity corresponding to each density is good, and the cement slurry has safe pumping conditions on the construction site; the minimum water loss amount under the condition of high temperature and pressure is 34mL, even if the water loss amount is 42mL under the condition of 180 ℃, the water loss amount meets the shale gas well cementation requirement and is less than 50 mL; the cement slurries in examples 1 to 5 all meet the requirements of zero water separation, high fluidity and good sedimentation stability. In the cement paste formula of the comparative example 1, the addition of the fluid loss agent is lower than the minimum value of the recommended use amount of the system, so that the water loss amount of the formed cement paste is 57mL under the high-temperature and pressure experimental condition, and the water loss amount which does not meet the requirement of the shale gas-solid well construction scheme is less than or equal to 50 mL.
The mechanical properties of the set cements prepared from the cement slurry systems prepared in examples 1 to 5 and comparative examples 1 and 2 were evaluated according to the oil well cement test method, GB19139-2012, and the results are shown in table 3.
TABLE 3 mechanical properties of high-temperature-resistant, high-density, elastic and tough set cement
As can be seen from Table 3, the cement paste systems prepared in examples 1 to 5 all have an elastic modulus of less than 6GPa, which is required by shale gas-solid well construction schemes. The cement paste system prepared in the comparative example 2 has the elastic modulus of 6.8GPa for the set cement formed by curing under the conditions of high temperature and high pressure, and the main reason is that the elastic modulus of the set cement is obviously increased due to the fact that the addition of the elastic material is lower than the minimum value of the recommended use amount of the system, and is higher than 6GPa required by the shale gas-solid well construction scheme, so that effective sealing of an annular space cannot be guaranteed in the later fracturing construction process, and the risk of the annular space under pressure is greatly increased.
While the invention has been described with reference to specific embodiments, those skilled in the art will appreciate that various changes can be made without departing from the true spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation, material, composition of matter, and method to the essential scope and spirit of the present invention. All such modifications are intended to be included within the scope of the present invention as defined in the appended claims.
Claims (10)
1. The cement slurry system has the material including G-level oil well cement, high temperature resisting elastic material, high temperature resisting fluid loss reducing agent, high temperature resisting inorganic anti-channeling emulsion, weighting agent, high temperature strength stabilizer, dispersant, slurry regulator, retarder and water.
2. The cement slurry system according to claim 1, wherein the high temperature resistant elastic material is 4-8 parts, the high temperature resistant fluid loss additive is 4-6 parts, the high temperature resistant inorganic anti-channeling emulsion is 5-10 parts, the weighting agent is 60-90 parts, the high temperature strength stabilizer is 30-60 parts, the dispersant is 0.8-1 part, the slurry conditioner is 0.8-1 part, the retarder is 1-2 parts, and the water is 55-59 parts based on 100 parts by mass of the G-grade oil well cement.
3. The cement slurry system according to claim 1 or 2, wherein the high temperature resistant elastic material is nano-silicon-rubber composite particles with nano-silicon as a shell and rubber as a core; preferably, the nano-silicon-rubber composite particles are formed by wrapping the rubber particles with the average particle size of 140-180 meshes by the nano-silicon with the average particle size of 100-300 nm.
4. The cement slurry system according to any one of claims 1 to 3, wherein the high temperature fluid loss additive is an AMPS multipolymer, wherein raw materials for preparing the AMPS multipolymer comprise the following: 100 parts by mass of water, 40 to 80 parts by mass of 2-acrylamido-2-methylpropanesulfonic acid, 1 to 30 parts by mass of 3-allyloxy-2-hydroxy-1-propanesulfonic acid, 30 to 70 parts by mass of N' N-dimethylacrylamide, 1 to 20 parts by mass of acrylic acid, 1 to 20 parts by mass of acrylonitrile;
preferably, the steps for preparing the AMPS multipolymer are as follows: adding 40 to 80 parts by mass of 2-acrylamido-2-methylpropanesulfonic acid, 1 to 30 parts by mass of 3-allyloxy-2-hydroxy-1-propanesulfonic acid, 30 to 70 parts by mass of N' N-dimethylacrylamide, 1 to 20 parts by mass of acrylic acid, and 1 to 20 parts by mass of acrylonitrile to 100 parts by mass of water, stirring to dissolve, then adjusting the pH of the solution to 6 to 7, followed by holding at 60 to 75 ℃ for 1 to 1.5 hours under an inert atmosphere; then adding an initiator under the stirring state, continuously reacting under the stirring state at the temperature of between 60 and 75 ℃, and cooling to room temperature to obtain the high-temperature-resistant fluid loss agent; wherein the initiator comprises an oxidizing agent and a reducing agent; the amount of the oxidizing agent is 0.1 to 0.3 part by mass based on 100 parts by mass of the water; the amount of the reducing agent is 0.1 to 0.3 part by mass; the oxidant is ammonium persulfate, and the reducing agent is sodium bisulfite.
5. The cement slurry system according to any one of claims 1 to 4, wherein the high temperature resistant inorganic anti-channeling emulsion is a nano silica emulsion.
6. The cement slurry system according to any one of claims 1 to 5, wherein the weighting agent is iron ore powder with a particle size of 100 to 150 mesh.
7. Grout system according to any of claims 1 to 6, wherein the dispersant is an aldehyde ketone polycondensate; and/or
The slurry regulator is sodium silicate; and/or
The retarder is acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer; and/or
The high-temperature strength stabilizer is silicon powder with the purity of more than 95 percent and the particle size of 60-100 meshes.
8. Cement paste system according to any of claims 1 to 7, characterized in that it has a density of 2 to 2.5g/cm3。
9. Method for the preparation of a cement slurry system according to any of claims 1 to 8, comprising the steps of:
1) uniformly mixing the pure cement of the G-grade oil well, a weighting agent, a high-temperature strength stabilizer and a high-temperature resistant elastic material to obtain large sample ash;
2) adding the high-temperature-resistant fluid loss agent, the high-temperature-resistant inorganic anti-channeling emulsion, the dispersing agent, the slurry regulator and the retarder into water, and uniformly mixing to obtain large-scale water;
3) and pouring the large sample ash into the large sample water, and uniformly mixing to obtain the cement paste system.
10. The method according to claim 9, wherein the large sample ash obtained in step 1) is stored in a closed container for use within 5 days before construction.
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| CN114196386A (en) * | 2020-09-17 | 2022-03-18 | 中国石油化工股份有限公司 | Well cementation spacer fluid composition, well cementation spacer fluid and preparation method and application thereof |
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| US11359129B2 (en) | 2018-11-12 | 2022-06-14 | Exxonmobil Upstream Research Company | Method of placing a fluid mixture containing compressible particles into a wellbore |
| US11401459B2 (en) | 2018-11-12 | 2022-08-02 | Exxonmobil Upstream Research Company | Fluid mixture containing compressible particles |
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| CN114196386A (en) * | 2020-09-17 | 2022-03-18 | 中国石油化工股份有限公司 | Well cementation spacer fluid composition, well cementation spacer fluid and preparation method and application thereof |
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