CN112279543B - Composite ultrahigh-temperature cement stone mechanical modified material and preparation method thereof - Google Patents
Composite ultrahigh-temperature cement stone mechanical modified material and preparation method thereof Download PDFInfo
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- CN112279543B CN112279543B CN202011165179.8A CN202011165179A CN112279543B CN 112279543 B CN112279543 B CN 112279543B CN 202011165179 A CN202011165179 A CN 202011165179A CN 112279543 B CN112279543 B CN 112279543B
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- 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
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Abstract
The invention relates to a composite ultrahigh-temperature cement stone mechanical modified material which comprises the following components in parts by weight: 65-75 parts of first high-temperature strength recession prevention material, 20-30 parts of second high-temperature strength recession prevention material and 5 parts of ultrahigh-temperature toughening material. The first high-temperature strength recession prevention material is acid-washed quartz sand with the granularity of more than 400 meshes. The second high-temperature strength recession prevention material is a compound mixture of two of wollastonite, kyanite, flint clay and alunite, and the fineness of the mixture is between 100-400 meshes. The ultrahigh-temperature toughening material is a halloysite nanotube. The preparation method of the composite ultrahigh-temperature cement stone mechanical modified material is obtained by fully mixing and stirring a first high-temperature strength recession prevention material, a second high-temperature strength recession prevention material and an ultrahigh-temperature toughening material according to the specified parts by weight. The invention can ensure that the strength of the cement stone is not declined under the ultra-high temperature condition, has better toughness, can effectively improve the mechanical property of the ultra-high temperature well cementation cement stone above 240 ℃, and has wide market application prospect.
Description
Technical Field
The invention relates to a composite ultra-high temperature cement stone mechanical modified material and a preparation method thereof in the field of oil and gas field exploration and development, which are used for improving the mechanical property of ultra-high temperature well cementation cement stones above 240 ℃.
Background
With the rapid development of economy and society in China, the demand of oil and gas resources is continuously increased, and in order to guarantee the national energy safety and reduce the external dependence of oil and gas, the exploration and development strength must be increased. Deep ultra-deep oil gas has great potential and is an important take-over resource. The deep oil-gas reservoirs of more than 8000m are successively proved in basins of Tarim, Quaschol, Sichuan and chada, the number of deep ultra-deep wells is gradually increased along with the deepening of oil-gas exploration and development, the temperature of a shaft is higher and higher, the bottom temperature can reach more than 240 ℃, and the ultra-high temperature well cementation cement slurry technology has important significance for guaranteeing the deep ultra-deep oil-gas exploration and development.
Aiming at the problem of strength decline of oil well cement at the temperature of more than 110 ℃, quartz sand is mainly added into cement paste at home and abroad to improve the silica-calcium ratio of the cement paste, so that the decline of the high-temperature strength of the cement paste is inhibited, and researches show that the sand-added cement paste can keep better high-temperature resistance for a long time at the temperature of 110-200 ℃. But above 200 ℃, the strength of the sand-added cement paste still declines under the condition of ultrahigh temperature. Meanwhile, the set cement has high brittleness, is easy to break under the action of ultrahigh temperature, and has toughness to be improved.
For example, the invention relates to a nano material mixed modified ultra-high temperature high performance well cementation cement slurry system and a preparation method thereof (CN 109679600A), which adopts the matching of coarse silica sand and fine silica sand, combines nano silicon dioxide and nano calcium carbonate, can improve the mechanical property of high temperature set cement, has the strength of 60MPa after 5 days, the elastic modulus of about 8.5, and can generate long-term strength decline (more than 28 days) at the high temperature of more than 240 ℃. The invention relates to an oil well cement slurry system for preventing high-temperature strength from declining and a preparation method thereof (CN 110484223A), wherein a strength reinforcing agent is used as graphene emulsion, a suspension stabilizer is micron-sized shaped silicon dioxide and 8-12% xanthan gum, the construction performance of the cement slurry is good at 180 ℃, the strength is 35MPa, and the cement slurry does not decline in 14 days, but the material cost used by the method is higher, and the method is not suitable for well cementation construction under the condition of the ultrahigh temperature of more than 200 ℃. The invention discloses a well cementation cement for an ultrahigh temperature deep well and a preparation method and application thereof (CN 110563428A). A first strength recession resistant agent silicon powder is adopted, a second strength recession resistant agent is one or more of aluminum oxide, aluminum hydroxide, zinc oxide, zinc hydroxide and strontium chloride, the strength of a set cement at 200-240 ℃ is not declined by 30MPa, and the method is not high enough in ultrahigh temperature and is not subjected to toughness transformation.
Although the prior art has certain effects on the aspects of mechanical modification of high-temperature cement and the like, the prior art still has problems on the aspects of strength decline and toughening of ultra-high-temperature cement stones, and can not meet the well cementation operation of complex strata of ultra-high-temperature ultra-deep wells. Therefore, the development of the composite ultra-high temperature set cement mechanical modified material has important significance for improving the well cementation quality of ultra-high temperature oil and gas wells.
Disclosure of Invention
The invention aims to provide a composite ultra-high temperature cement stone mechanical modified material, which can ensure that the strength of cement stones under the ultra-high temperature condition is not declined, has better toughness, can effectively improve the mechanical property of ultra-high temperature well cementation cement stones above 240 ℃, and has wide market application prospect.
The invention also aims to provide a preparation method of the composite ultrahigh-temperature cement stone mechanical modified material, which has reliable principle and simple and convenient operation, can effectively improve the well cementation quality and the well cementation sealing integrity of high-temperature deep wells and unconventional oil and gas wells, and meets the higher requirements of the well cementation of complex wells such as deep wells, ultra-deep wells and the like on the mechanical properties such as the strength, the toughness and the like of cement sheath.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
The composite ultrahigh-temperature cement stone mechanical modified material comprises the following components in parts by weight:
65-75 parts of first high-temperature strength recession prevention material,
20-30 parts of a second high-temperature strength recession prevention material,
5 parts of ultrahigh-temperature toughening material.
The first high-temperature strength recession prevention material is acid-washed quartz sand with the granularity of more than 400 meshes.
The second high-temperature strength recession prevention material is a compound mixture of two of wollastonite, kyanite, flint clay and alunite, and the fineness of the mixture is between 100-400 meshes.
The ultrahigh-temperature toughening material is a halloysite nanotube.
The preparation method of the composite ultrahigh-temperature cement stone mechanical modified material is obtained by fully mixing and stirring a first high-temperature strength recession prevention material, a second high-temperature strength recession prevention material and an ultrahigh-temperature toughening material according to the specified parts by weight.
According to the invention, through reasonably designing the granularity of the composite ultrahigh-temperature set cement mechanical modification material, after the composite ultrahigh-temperature set cement mechanical modification material is doped into cement paste, the first high-temperature strength recession prevention material, the second high-temperature strength recession prevention material, the ultrahigh-temperature toughening material and oil well cement particles in a cement paste system are mutually filled, so that a tight accumulation state is realized, and the mechanical property of the ultrahigh-temperature set cement is effectively improved.
Under the condition of ultrahigh temperature, after the cement paste is hardened into the set cement, the long-term strength of the set cement is more than 50MPa, the Young modulus is less than 8GPa, the toughness is good, and the problems of large brittleness and long-term strength degradation of the set cement under the condition of ultrahigh temperature are solved.
After the composite ultrahigh-temperature cement stone mechanical modified material is doped into cement paste, a stabilizer, a fluid loss agent, a retarder and other additives are combined, so that the cement paste system has good stability, the fluid loss property meets the standard, the rheological property is good, the thickening time and the density are adjustable, and the well cementation construction performance meets the well cementation requirement of an oil-gas well.
Compared with the prior art, the invention has the following beneficial effects:
(1) compared with common quartz sand, the acid-treated refined quartz sand has higher purity and better effect of improving the strength of the ultra-high temperature set cement;
(2) the invention adopts two compound mixtures of wollastonite, kyanite, flint clay and alunite as high-temperature-resistant strength decay materials to participate in high-temperature hydration, thereby being beneficial to generating high-temperature stable crystalline phases such as calcium aluminum garnet, calcium aluminum melilite and the like and effectively ensuring the long-term strength stability of the cement under the ultra-high temperature condition;
(3) the invention adopts the halloysite nanotube as the ultra-high temperature toughening material, the two ends of the halloysite nanotube are nano-sized, and the surface of the nanotube contains SiO2And Al2O3The halloysite nanotube nano-scale toughening agent has a crystal nucleus effect and a volcanic ash effect, participates in cement hydration under an ultrahigh temperature condition, realizes nanoscale reinforcement and toughening, is good in temperature resistance, has hydrophilic groups on the surface, is good in dispersibility in cement paste, belongs to natural minerals, and is low in cost.
In conclusion, the invention has low cost of synthetic raw materials, can obviously improve the mechanical property of the cement paste for well cementation at the temperature of over 240 ℃, and has constructability which can meet the well cementation requirement of oil and gas wells and can also meet the higher requirements of the well cementation of complex wells such as deep wells, ultra-deep wells and the like on the mechanical properties such as the strength, the toughness and the like of cement sheath.
Detailed Description
The present invention is further illustrated below by examples to facilitate understanding of the invention by those skilled in the art. It is to be understood that the invention is not limited in scope to the specific embodiments, but is intended to cover various modifications within the spirit and scope of the invention as defined and defined by the appended claims, as would be apparent to one of ordinary skill in the art.
Example 1
Weighing 70 parts of a first high-temperature strength recession prevention material (600-mesh acid quartz sand), 25 parts of a second high-temperature strength recession prevention material (100-mesh wollastonite and flint clay are compounded in a mass ratio of 1: 1), and 5 parts of an ultrahigh-temperature toughening material (halloysite nanotube), and fully mixing the first high-temperature strength recession prevention material, the second high-temperature strength recession prevention material and the ultrahigh-temperature toughening material to obtain the composite ultrahigh-temperature cement stone mechanical modification material.
Example 2
Weighing 70 parts of a first high-temperature strength recession prevention material (800-mesh acid quartz sand), 25 parts of a second high-temperature strength recession prevention material (100-mesh wollastonite and 200-mesh alumite are compounded in a mass ratio of 1: 1) and 5 parts of an ultrahigh-temperature toughening material (halloysite nanotube), and fully mixing the first high-temperature strength recession prevention material, the second high-temperature strength recession prevention material and the ultrahigh-temperature toughening material to obtain the composite ultrahigh-temperature cement stone mechanical modification material.
Example 3
Weighing 75 parts of a first high-temperature strength recession prevention material (600-mesh acid quartz sand), 20 parts of a second high-temperature strength recession prevention material (200-mesh kyanite and 200-mesh alumite are compounded in a mass ratio of 1: 1) and 5 parts of an ultrahigh-temperature toughening material (halloysite nanotube), and fully mixing the three materials to obtain the composite ultrahigh-temperature cement stone mechanical modification material.
The effect of using the example and the ordinary quartz sand on the mechanical properties of the 240 ℃ ultra-high temperature set cement was compared, and the compressive strength and Young's modulus of the hardened set cement were measured after curing at 240 ℃ 20MPa for 2 days, 7 days, 28 days, and 60 days, and the results are shown in Table 1.
TABLE 1 mechanical Properties of 240 ℃ ultra high temperature set cement formulated separately using the examples and quartz sand
The formula is as follows: the cement comprises G-grade cement, 50% of high-temperature set cement mechanical modified material, 1% of high-temperature dispersing agent, 3% of high-temperature stabilizing agent, 2% of fluid loss agent, 1.2% of high-temperature retarder, 0.1% of defoaming agent and 55% of water.
The effect of the examples and the ordinary quartz sand on the mechanical properties of the 260 ℃ ultrahigh temperature set cement was compared, and the compressive strength and Young's modulus of the hardened set cement were measured after curing at 260 ℃ and 20MPa for 2 days, 7 days, 28 days, and 60 days, and the results are shown in Table 2.
TABLE 2 mechanical properties of 260 ℃ ultra high temperature set cement prepared using examples and quartz sand respectively
The formula is as follows: the cement comprises G-grade cement, 50% of high-temperature set cement mechanical modified material, 1% of high-temperature dispersing agent, 3% of high-temperature stabilizing agent, 2% of fluid loss agent, 1.2% of high-temperature retarder, 0.1% of defoaming agent and 55% of water.
According to the results, when the ordinary quartz sand is used as the high-temperature cement stone mechanical modified material, the long-term strength of the cement stone is reduced by nearly half under the ultra-high temperature condition, and by adopting the composite ultra-temperature cement stone mechanical modified material, the strength of the cement stone is increased along with the age, the strength of the cement stone is close to 50MPa after 28 days, the strength of the cement stone exceeds 50MPa after 28 days, the Young modulus of the cement stone is less than 8GPa, and the toughness is better.
The cement paste workability was measured at the circulation temperatures of 210 c and 220 c, which were prepared in the examples, and the results are shown in table 3.
TABLE 3 workability of ultra-high temperature cement slurries formulated in the examples
The formula is as follows: the cement comprises G-grade cement, 50% of high-temperature set cement mechanical modified material, 1% of high-temperature dispersing agent, 3% of high-temperature stabilizing agent, 2% of fluid loss agent, 1.2% of high-temperature retarder, 0.1% of defoaming agent and 55% of water.
Experimental results show that the ultra-high temperature cement slurry system prepared by the embodiment has good comprehensive performance and meets the requirements of ultra-high temperature deep well cementing construction.
Claims (2)
1. The composite ultrahigh-temperature cement stone mechanical modified material comprises the following components in parts by weight:
65-75 parts of first high-temperature strength recession prevention material,
20-30 parts of a second high-temperature strength recession prevention material,
5 parts of ultrahigh-temperature toughening material;
the first high-temperature strength recession prevention material is acid-washed quartz sand with the granularity of more than 400 meshes;
the second high-temperature strength recession prevention material is a compound mixture of two of wollastonite, kyanite, flint clay and alunite, and the fineness of the mixture is between 100-400 meshes;
the ultrahigh-temperature toughening material is a halloysite nanotube.
2. The preparation method of the composite ultrahigh-temperature set cement mechanical modification material of claim 1, which is obtained by fully mixing and stirring a first high-temperature strength recession prevention material, a second high-temperature strength recession prevention material and an ultrahigh-temperature toughening material according to the specified parts by weight.
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| CN113683354B (en) * | 2021-09-22 | 2022-04-08 | 中国石油天然气集团有限公司 | High-temperature-resistant strength decay inhibition oil well cement and preparation method and application thereof |
| CN115851246B (en) * | 2022-11-29 | 2023-11-21 | 嘉华特种水泥股份有限公司 | Oil well cement toughening material for well cementation and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE60308651D1 (en) * | 2002-02-16 | 2006-11-09 | Schlumberger Technology Bv | CEMENT COMPOSITIONS FOR HIGH-TEMPERATURE APPLICATIONS |
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| CN101805596A (en) * | 2010-03-30 | 2010-08-18 | 哈尔滨金建伟业科技发展有限公司 | Non-floating bead low-density oil-well cement |
| CN105154041A (en) * | 2015-07-27 | 2015-12-16 | 中国石油集团渤海钻探工程有限公司 | Oil well cement flexibilizer |
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| CN110862245A (en) * | 2018-08-28 | 2020-03-06 | 中国石油天然气股份有限公司 | Well cementation cement for high-temperature deep well and preparation method and application thereof |
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