CN115124292A - Method for physically modifying natural rock asphalt and toughened oil well cement slurry system - Google Patents
Method for physically modifying natural rock asphalt and toughened oil well cement slurry system 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
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/36—Bituminous materials, e.g. tar, pitch
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- 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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- 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
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Abstract
The invention relates to a method for physically modifying natural rock asphalt, an oil well cement slurry system toughened by the modified natural rock asphalt by the physical method, and a method for modifying the natural rock asphalt by a micro-explosion method is reliable, simple to operate, low in cost, safe, pollution-free, quick to prepare and excellent in performance; the cement paste system prepared from the natural rock asphalt modified by the micro-explosion method has good stability and fluidity, can prolong the safe cementing time, and meets the site cementing construction requirements of medium-deep wells and deep wells; compared with the cement stone toughened by the unmodified natural rock asphalt, the cement stone toughened by the modified rock asphalt has larger improvement range of the toughness of the cement stone at the same curing temperature, and the cement paste system can meet the use requirements of medium-deep wells and deep wells through experimental data.
Description
Technical Field
The invention relates to a method for physically modifying natural rock asphalt and an oil well cement slurry system toughened by the modified natural rock asphalt by the physical method.
Background
The cement slurry is injected between the stratum and the casing to form a cement sheath to support the casing, reinforce the well wall and seal and separate the oil-gas layer, which is a well cementation technology in the petroleum development technology and is necessary guarantee for ensuring the safe exploitation of oil gas. With the progress of exploration technology, the number of deep wells and ultra-deep wells is increasing, and high temperature and ultra-high temperature also become problems which must be faced in the well cementation technology.
In cement slurry injected in well cementation, a cement sheath formed by hardening is a heterogeneous multiphase material, is mostly combined by ionic bonds and covalent bonds, has poor deformability and brittle self-body, and presents typical brittle fracture characteristics under the action of external force. In addition, the micro-pores inside the cement sheath are easy to develop into cracks under the action of external force, so that the cement sheath is damaged. And the subsequent oil and gas exploitation link can cause serious stress impact on the cement sheath. Meanwhile, the strength of the cement sheath is reduced and the impact resistance is reduced due to the crystal form transformation of a cement hydration product under high temperature, once the external force exceeds the threshold value which can be borne by the cement sheath, cracks in the cement sheath can be rapidly expanded, so that sudden brittle cracking is caused, grooves are shifted among sections of the oil, gas and water thin interlayer, and the cement sheath loses the interlayer sealing capability. Therefore, the deformation capability of the cement ring under high temperature is improved, the integrity of the cement ring is kept in the normal production life of the whole oil and gas well, and the cement ring has great significance for improving the well cementation quality and meeting the requirement of long-term safe exploitation of the oil and gas well.
The natural rock asphalt has low price, wide source and stable property. At present, partial research on a rock asphalt toughened oil well cement slurry system is carried out by a subject group, and the rock asphalt is found to obviously improve the toughness of oil well cement (Zhang chunk, Xu Hao, Qing Long et al. interface characteristics of oil-well cement and rock asphalt coated by cement silicate. journal of addition Science and Technology,2020,35(9) 973-992.Zhang Chunmei, Cai Jingxuan, Cheng, Xiaoweiei et al, interface and crack propagation of center-based compositions with a sulfonated alpha and plasma-derived rock alpha, construction and Building Materials,2020,242: 118161.). The rock asphalt has thermal expansibility at high temperature, can effectively prevent oil gas from entering cement through micro cracks, and shows that the rock asphalt has great potential in the aspect of high-temperature well cementation. However, the existing rock asphalt hydrophilic modification process has the following problems: the plasma treated and modified rock asphalt product has timeliness, is difficult to store and has high cost; rock asphalt surface grafting C 2 The S process is complex, the cost is high, the modification efficiency is low, the large-scale engineering application of the rock asphalt is limited, and the problems of the compatibility and the dispersibility of the rock asphalt and cement paste still need to be solved.
Aiming at the problems, the invention adopts the liquid nitrogen micro-explosion method to modify the rock asphalt on the basis of adopting the natural rock asphalt as the toughening agent, has simple preparation process, does not need any large-precision equipment, only needs to treat the rock asphalt with liquid nitrogen and then place the treated rock asphalt into hot ethanol water solution, has low cost and high modification efficiency, and can complete the modification process only in a few minutes.
Disclosure of Invention
The invention aims to provide a method for physically modifying natural rock asphalt, which has the advantages of high efficiency, cleanness, environmental protection, low energy consumption, quick reaction, no damage to the performance of a material body and the like, and has wide application prospect.
The invention also aims to provide the oil well cement slurry system toughened by the modified natural rock asphalt, which improves the compatibility and the dispersibility of the natural rock asphalt and oil well cement slurry, ensures the stability of the cement slurry, has good comprehensive mechanical property, greatly improves the toughness of the hardened cement stone, and can meet the use requirement of medium-deep wells.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
in one aspect, a preparation method of physically modified natural rock asphalt is provided, which comprises the following steps:
s1: coating 40-60 g of natural rock asphalt powder with a preservative film, and putting into liquid nitrogen for freezing for 0.5-2 h;
s2: preparing deionized water and absolute ethyl alcohol according to the volume ratio of 0.5-2 to obtain a mixed solution, and heating to 50-100 ℃;
s3: pouring the mixed solution into a plastic cup, adding the frozen natural rock asphalt, stirring for 5min, and performing suction filtration;
s4: drying for 24h at the temperature of 60 ℃ to obtain the physically modified natural rock asphalt;
the oil well cement slurry system toughened by the physically modified natural rock asphalt comprises the following components in parts by weight: 100 parts of oil well cement, 1-4 parts of modified natural rock asphalt, 0.2-2 parts of a dispersing agent, 0.5-4 parts of a fluid loss agent, 0.5-2.5 parts of a retarder, 2-4 parts of a suspension stabilizer, 35 parts of a high-temperature strength stabilizer, 0.05-0.3 part of a defoaming agent and 40-50 parts of water.
Preferably, the preparation method of the oil well cement slurry system toughened by the physically modified natural rock asphalt comprises the following steps:
s1: weighing 100 parts by weight of oil well cement, 1-4 parts by weight of a toughening agent, 2-4 parts by weight of a suspension stabilizer, 0.2-2 parts by weight of a dispersing agent, 0.5-4 parts by weight of a fluid loss agent, 0.5-2.5 parts by weight of a retarder and 35 parts by weight of a high-temperature strength stabilizer, and dry-mixing the materials into a dry powder mixture;
s2: weighing 40-50 parts by weight of water, mixing 0.05-0.3 part by weight of defoaming agent in the water, placing the aqueous solution in a high-speed stirrer, and rotating the stirrer at a low speed (4000 +/-200 revolutions per minute);
s3: the weighed dry powder mixture was added within 15 seconds, the closed stirrer was closed and the stirrer continued stirring at high speed (12000 ± 500 rpm) for 35 seconds:
s4: the oil well cement slurry system toughened by the physically modified natural rock asphalt is obtained.
Preferably, the oil well cement is a grade G oil well cement.
Preferably, the dispersant is an acetone-formaldehyde condensate.
Preferably, the fluid loss additive is an AMPS-amide-carboxylic acid polymer.
Preferably, the retarder can be one or a mixture of citric acid and calcium gluconate.
Preferably, the suspension stabilizer is bentonite, and the technical index of the product meets the standard GB/T5005-2010.
Preferably, the high-temperature strength stabilizer is quartz sand which meets the standard Q/SYCPET J120023-2021.
Preferably, the defoaming agent is polypropylene glycol.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method for modifying the natural rock asphalt by the micro-explosion method is reliable, low in cost, safe, pollution-free, rapid to prepare and excellent in performance; compared with plasma treatment (CN201510595916.0), the micro-explosion method modified natural rock asphalt does not need any large-scale equipment, is simple to operate, does not use any toxic and harmful chemical preparation in the modification process, and has the quality of one-time modification more than 4 times that of plasma treatment.
(2) The cement paste system prepared from the natural rock asphalt modified by the micro-explosion method has good stability and fluidity, can prolong the safe cementing time, and meets the site cementing construction requirements of medium-deep wells and deep wells; compared with sulfonated asphalt (CN201410047943.X), cement slurry performance tests (fluidity test, sedimentation stability test and thickening experiment) show that rock asphalt modified by a microexplosion method has smaller influence on the fluidity of cement slurry than sulfonated asphalt, improves the stability, does not have retardation effect on the cement slurry, and reduces the difficulty of well cementation construction.
(3) Compared with the cement stone toughened by the unmodified natural rock asphalt, the cement stone toughened by the modified rock asphalt has the advantages that the compressive strength of the cement stone doped with the modified rock asphalt is slightly reduced when the cement stone is cured for 3 days and cured for 7 days at the same curing temperature compared with the cement stone toughened by the unmodified natural rock asphalt in the example 1. When the curing is carried out for 14 days, the compressive strength at 120 ℃ is reduced by 9.8 percent at most compared with that of the embodiment 1, the tensile strength can be improved by 24.1 percent at most, and the brittleness coefficient is reduced by 27.33 percent at most; compared with the embodiment 1, the 150 ℃ compressive strength is reduced by 9.7 percent at most, the tensile strength can be improved by 26.48 percent at most, and the brittleness coefficient is reduced by 28.62 percent at most; the 180 ℃ compressive strength is reduced by 10.68 percent at most compared with that of the embodiment 1, the maximum tensile strength can be improved by 37.3 percent, and the maximum brittleness coefficient is reduced by 34.94 percent; the toughness of the set cement is greatly improved. From the experimental data of 180 ℃, the cement slurry system can meet the use requirements of medium-deep wells and deep wells.
The technical scheme provides a natural rock asphalt toughened oil well cement slurry system which can be used under the conditions of high temperature and high pressure, has low cost, is green and pollution-free, can meet various engineering performance indexes required by well cementation technical service, can improve the inherent brittleness of cement stone, and can prevent the high-temperature strength decline of the well cementation cement stone to a certain extent; compared with plasma treatment (CN201510595916.0), the technical scheme remarkably reduces the cost, does not need any large-scale equipment in the modification process, simultaneously remarkably improves the modification yield, and does not need any toxic and harmful chemical preparation; compared with sulfonation treatment (CN201410047943.X), the modified natural rock asphalt prepared by the technical scheme does not contain sulfonic acid groups, avoids cement paste retardation, and solves the technical problem of low early strength of cement stone cementing; compared with the other two asphalt modification schemes, the technical scheme solves the problem of compatibility between the natural rock asphalt and the cement paste by a pure physical method, reduces the modification cost, improves the modification efficiency, solves the problem of toughening of oil well cement stones under the conditions of high temperature and high pressure, and has a certain effect of inhibiting the strength decline of the cement stones under the high temperature.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparing a blank cement slurry system:
100 parts by weight of oil well cement, 2 parts by weight of bentonite, 1 part by weight of acetone-formaldehyde condensate, 3 parts by weight of AMPS-amide-carboxylic acid polymer, 0.5 part by weight of calcium gluconate are weighed and dry-mixed to form a dry powder mixture, and 35 parts by weight of quartz sand. Weighing 46 parts by weight of water and 0.05 part by weight of polypropylene alcohol, mixing the water solution in water, putting the water solution in a high-speed stirrer, rotating the stirrer at a low speed (4000 +/-200 revolutions per minute), adding the weighed dry powder mixture within 15 seconds, covering a cover of the stirrer, and continuously stirring for 35 seconds at a high speed (12000 +/-500 revolutions per minute) to obtain a blank reference sample cement paste system.
Example 2
Firstly, preparing a modified natural rock asphalt toughening agent:
coating 40 g of natural rock asphalt powder with a preservative film, putting the natural rock asphalt powder into liquid nitrogen for freezing for 0.5h, heating a mixed solution (volume ratio is 0.5) of deionized water and absolute ethyl alcohol to 50 ℃, then pouring the mixed solution into a plastic cup, putting the rock asphalt subjected to freezing, stirring for 5min, performing suction filtration, and drying at 60 ℃ for 24h to obtain the modified natural rock asphalt toughening agent.
Preparing an oil well cement slurry system toughened by the modified natural rock asphalt:
100 parts by weight of oil well cement, 1 part by weight of modified natural rock asphalt powder, 3 parts by weight of bentonite, 1 part by weight of acetone-formaldehyde condensate, 2 parts by weight of AMPS-amide-carboxylic acid polymer, 1.5 parts by weight of calcium gluconate, 35 parts by weight of quartz sand and 0.5 part by weight of citric acid are weighed and dry-mixed to form a dry powder mixture. Weighing 48 parts by weight of water and 0.1 part by weight of polypropylene alcohol, mixing the water solution in water, putting the water solution in a high-speed stirrer, rotating the stirrer at a low speed (4000 +/-200 revolutions per minute), adding the weighed dry powder mixture within 15 seconds, covering a cover of the stirrer, and continuously stirring at a high speed (12000 +/-500 revolutions per minute) for 35 seconds to obtain the natural rock asphalt toughened oil well cement slurry system.
Example 3
Preparing a modified natural rock asphalt toughening agent:
coating 50 g of natural rock asphalt powder with a preservative film, putting the coated natural rock asphalt powder into liquid nitrogen for freezing for 1.5h, heating a mixed solution (volume ratio is 1) of deionized water and absolute ethyl alcohol to 100 ℃, then pouring the mixed solution into a plastic cup, putting the frozen rock asphalt into the plastic cup, stirring for 5min, performing suction filtration, and drying at 60 ℃ for 24h to obtain the modified natural rock asphalt toughening agent.
Preparing an oil well cement slurry system toughened by the modified natural rock asphalt:
100 parts by weight of oil well cement, 2 parts by weight of modified natural rock asphalt powder, 2 parts by weight of bentonite, 1.5 parts by weight of acetone-formaldehyde condensate, 1 part by weight of AMPS-amide-carboxylic acid polymer, 2 parts by weight of calcium gluconate and 35 parts by weight of quartz sand are weighed and dry-mixed to form a dry powder mixture. Weighing 48 parts by weight of water and 0.2 part by weight of polypropylene alcohol, mixing the water solution in water, putting the water solution in a high-speed stirrer, rotating the stirrer at a low speed (4000 +/-200 revolutions per minute), adding the weighed dry powder mixture within 15 seconds, covering a cover of the stirrer, and continuously stirring at a high speed (12000 +/-500 revolutions per minute) for 35 seconds to obtain the natural rock asphalt toughened oil well cement slurry system.
Example 4
Firstly, preparing a modified natural rock asphalt toughening agent:
coating 50 g of natural rock asphalt powder with a preservative film, putting the coated natural rock asphalt powder into liquid nitrogen for freezing for 2h, heating a mixed solution (volume ratio is 1) of deionized water and absolute ethyl alcohol to 75 ℃, then pouring the mixed solution into a plastic cup, putting the frozen rock asphalt into the plastic cup, stirring for 5min, performing suction filtration, and drying at 60 ℃ for 24h to obtain the modified natural rock asphalt toughening agent.
Preparing an oil well cement slurry system toughened by the modified natural rock asphalt:
weighing 100 parts by weight of oil well cement, 3 parts by weight of modified natural rock asphalt powder, 1 part by weight of bentonite, 2 parts by weight of acetone-formaldehyde condensate, 2 parts by weight of AMPS-amide-carboxylic acid polymer, 1 part by weight of calcium gluconate, 0.5 part by weight of citric acid and 35 parts by weight of quartz sand, and dry-mixing to obtain a dry powder mixture. Weighing 48 parts by weight of water and 0.1 part by weight of polypropylene alcohol, mixing the water solution in water, putting the water solution in a high-speed stirrer, rotating the stirrer at a low speed (4000 +/-200 revolutions per minute), adding the weighed dry powder mixture within 15 seconds, covering a cover of the stirrer, and continuously stirring at a high speed (12000 +/-500 revolutions per minute) for 35 seconds to obtain the natural rock asphalt toughened oil well cement slurry system.
Example 5
Firstly, preparing a modified natural rock asphalt toughening agent:
coating 60 g of natural rock asphalt powder with a preservative film, putting the coated natural rock asphalt powder into liquid nitrogen for freezing treatment for 1h, heating a mixed solution (volume ratio is 2) of deionized water and absolute ethyl alcohol to 100 ℃, then pouring the mixed solution into a plastic cup, putting the frozen rock asphalt into the plastic cup, stirring for 5min, then performing suction filtration, and drying at 60 ℃ for 24h to obtain the modified natural rock asphalt toughening agent.
Preparing an oil well cement slurry system toughened by the modified natural rock asphalt:
weighing 100 parts by weight of oil well cement, 4 parts by weight of modified natural rock asphalt powder, 1 part by weight of bentonite, 2 parts by weight of acetone-formaldehyde condensate, 1 part by weight of AMPS-amide-carboxylic acid polymer, 1.5 parts by weight of calcium gluconate, 0.1 part by weight of citric acid and 35 parts by weight of quartz sand, and dry-mixing to obtain a dry powder mixture. Weighing 49 parts by weight of water, mixing 0.2 part by weight of polypropylene alcohol in the water, putting the aqueous solution in a high-speed stirrer, rotating the stirrer at a low speed (4000 +/-200 revolutions per minute), adding the weighed dry powder mixture within 15 seconds, covering a cover of the stirrer, and continuously stirring at a high speed (12000 +/-500 revolutions per minute) for 35 seconds to obtain the natural rock asphalt toughened oil well cement slurry system.
TABLE 1 Cement paste Performance test results for the examples
Note: API water loss conditions: 90 ℃ 7.1MPa 30 min; thickening conditions: 120 ℃ 80MPa 60min
Table 1 shows the results of the performance tests of the cement paste in each example, and it can be seen from Table 1 that the oil well cement paste toughened by natural rock asphalt has good stability, good fluidity, small water loss and thickening time of about 4-5 hours, and meets the requirements of safe cementing on site.
Table 2 testing results of the compression strength of set cement of each example
Table 2 shows the results of testing the compressive strength of the slurries of the examples under the conditions of 120 ℃/20.7MPa, 150 ℃/20.7MPa and 180 ℃/20.7MPa respectively, and cured in a water bath for 3 days and 7 days. As can be seen from Table 2, the compressive strength of the modified rock asphalt-doped set cement was slightly reduced when cured at the same curing temperature for 3 days and 7 days, as compared with example 1.
TABLE 3 mechanical Property test results of set cements of examples
Table 3 shows the results of testing the mechanical properties of the slurries of the examples in water bath curing for 14 days at 120 ℃/20.7MPa, 150 ℃/20.7MPa and 180 ℃/20.7MPa, respectively. As can be seen from Table 3, the compression strength of the set cement containing the modified rock asphalt was slightly lowered at the same curing temperature as in example 1. The 120 ℃ compressive strength is reduced by 9.8 percent at most compared with that of the embodiment 1, the tensile strength can be improved by 24.1 percent at most, and the brittleness coefficient is reduced by 27.33 percent at most; compared with the embodiment 1, the 150 ℃ compressive strength is reduced by 9.7 percent at most, the tensile strength can be improved by 26.48 percent at most, and the brittleness coefficient is reduced by 28.62 percent at most; the 180 ℃ compressive strength is reduced by 10.68 percent at most compared with that of the embodiment 1, the maximum tensile strength can be improved by 37.3 percent, and the maximum brittleness coefficient is reduced by 34.94 percent; the toughness of the set cement is greatly improved. From the experimental data of 180 ℃, the cement slurry system can meet the use requirements of medium-deep wells and deep wells.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A method for physically modifying natural rock asphalt and a toughened oil well cement slurry system are characterized in that the preparation method of the physically modified natural rock asphalt comprises the following steps:
s1: coating 40-60 g of natural rock asphalt powder with a preservative film, and putting into liquid nitrogen for freezing for 0.5-2 h;
s2: preparing deionized water and absolute ethyl alcohol according to the volume ratio of 0.5-2 to obtain a mixed solution, and heating to 50-100 ℃;
s3: pouring the mixed solution into a plastic cup, adding the frozen natural rock asphalt, stirring for 5min, and performing suction filtration;
s4: drying for 24 hours at the temperature of 60 ℃ to obtain the physically modified natural rock asphalt;
the oil well cement slurry system toughened by the physically modified natural rock asphalt comprises the following components in parts by weight: 100 parts of oil well cement, 1-4 parts of modified natural rock asphalt, 0.2-2 parts of a dispersing agent, 0.5-4 parts of a fluid loss agent, 0.5-2.5 parts of a retarder, 2-4 parts of a suspension stabilizer, 35 parts of a high-temperature strength stabilizer, 0.05-0.3 part of a defoaming agent and 40-50 parts of water.
2. The method for physically modifying natural rock asphalt and the toughened oil-well cement slurry system as claimed in claim 1, wherein the physically modified natural rock asphalt toughened oil-well cement slurry system is prepared by the following steps:
s1: weighing 100 parts by weight of oil well cement, 1-4 parts by weight of a toughening agent, 2-4 parts by weight of a suspension stabilizer, 0.2-2 parts by weight of a dispersing agent, 0.5-4 parts by weight of a fluid loss agent, 0.5-2.5 parts by weight of a retarder and 35 parts by weight of a high-temperature strength stabilizer, and dry-mixing the materials into a dry powder mixture;
s2: weighing 40-50 parts by weight of water, mixing 0.05-0.3 part by weight of defoaming agent in the water, placing the aqueous solution in a high-speed stirrer, and rotating the stirrer at a low speed (4000 +/-200 revolutions per minute);
s3: the weighed dry powder mixture was added within 15 seconds, the closed stirrer was closed and the stirrer was stirred at high speed (12000 ± 500 rpm) for a further 35 seconds:
s4: the oil well cement slurry system toughened by the physically modified natural rock asphalt is obtained.
3. The method of physically modifying natural rock asphalt and the toughened oil well cement slurry system as claimed in claim 2, wherein said oil well cement is a grade G oil well cement.
4. A method of physically modifying natural rock asphalt and a toughened oil well cement slurry system as claimed in claim 2, wherein said dispersant is an acetone-formaldehyde condensate.
5. The method for physically modifying natural rock asphalt and the toughened oil well cement slurry system as claimed in claim 2, wherein the fluid loss additive is AMPS-amide-carboxylic acid polymers.
6. The method for physically modifying natural rock asphalt and the toughened oil well cement slurry system as claimed in claim 2, wherein the retarder can be one or two of citric acid and calcium gluconate.
7. The method for physically modifying natural rock asphalt and the toughened oil well cement slurry system as claimed in claim 2, wherein the suspension stabilizer is bentonite, and the technical specification of the product meets the standard GB/T5005-2010.
8. The method for physically modifying natural rock asphalt and the toughened oil well cement slurry system as claimed in claim 2, wherein the high temperature strength stabilizer is quartz sand, which meets the standard Q/SY CPET J120023-2021.
9. The method of physically modifying natural rock asphalt and the toughened oil well cement slurry system of claim 2, wherein the defoamer is a polyallyl alcohol.
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