CN115353868B - High-temperature strength decay resistant material for well cementation and preparation method thereof - Google Patents
High-temperature strength decay resistant material for well cementation and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-temperature strength decay resistant material for well cementation and a preparation method thereof, and relates to the technical field of well cementation materials for oil and gas field development. The invention aims at solving the problem of strength decline from the perspective of cement hydration products. The high-temperature strength decay resistant material comprises, by weight, 55% -75% of lithium slag, 10% -20% of aerated concrete waste, 10% -20% of ceramic waste and 5% of carbon powder. The high-temperature strength decay resistant material is suitable for high-temperature environments, is doped into a cement slurry system to prepare the cement stone, and can ensure that the strength of the cement stone is not decayed in the high-temperature environments. The high-temperature strength decay resistant material has the characteristics of high compressive strength and high-temperature strength decay resistance.
Description
Technical Field
The invention relates to the technical field of well cementation materials for oil and gas field development, in particular to a high-temperature strength decay resistant material for well cementation and a preparation method thereof.
Background
In the oil gas exploitation process, the cement stone is in a high-temperature and high-pressure underground environment for a long time, and the mechanical strength, the cementing performance and the interval packing effect of the cement stone are required to meet the requirements in the service period of an oil gas well. The conventional silicate sand-adding cement slurry system has a plurality of problems in high temperature and ultra-high temperature environments, and the problems of cement stone high-temperature strength decline, cracking, shrinkage, poor cement slurry high-temperature stability and the like are particularly remarkable. At present, research on the improvement of the high-temperature mechanical properties of the silicate cement is mainly focused on the aspects of quartz sand doping amount, grading and the like under high-temperature conditions. However, research shows that the way of adding sand into cement is not capable of solving the problem of mechanical property degradation of cement stones in a high-temperature environment, so that development of a material for well cementation with high-temperature strength degradation resistance is needed to improve the mechanical property of a silicate cement system.
The invention patent application with the publication number of CN112574730A and the name of an oil well cement strength degradation inhibitor is published as 2021, 3 and 30, and comprises the following components: component (1), silicon dioxide, 30-60 parts; 40-70 parts of component (2), aluminum oxide. The oil well cement strength decay inhibitor can change cement hydration products, improve the compactness of cement stones, reduce the porosity and permeability of the cement stones, thereby effectively inhibiting the decay of the oil well cement strength under the ultra-deep well high-temperature complex condition, having wide applicable temperature range and not adversely affecting the cement slurry performance.
For another example, the invention patent application with the publication number of CN112457831A and the name of 'an oil well cement stone high-temperature stabilizer and application thereof' mainly comprises the following components in percentage by mass: 40-60% of precipitated silica; 30-40% of alumina powder; 5-15% of sepiolite powder; 5-10% of basalt fully-cut fiber; 1-2% of carbon nano tube. The high-temperature stabilizer for the oil well cement stone can form a cement slurry system suitable for the requirements of ultra-high temperature, heavy oil thermal production and geothermal well cementation, each performance meets the construction requirement, the formed cement stone ring is high-temperature resistant, the compression strength decay of the cement stone after fire driving and gas driving construction can be effectively avoided, the integrity of the cement stone ring is ensured, and ring blank belt pressure and sleeve damage caused by cement stone crushing are avoided.
For another example, liu Jingli et al published in journal of drilling fluid and completion fluid in 2020 on paper "a high temperature stabilizer for oil well set cement" which is a solid powder composed of a plurality of hydroxides as the main material and a proper amount of high temperature resistant fibers as the auxiliary material. These substances are used as inert admixture components, do not participate in hydration reaction at low temperature, and do not affect various properties of cement paste. The hydroxide component in the stabilizer has good heat absorption effect and has phase change, dehydration and endothermic decomposition reaction at the high temperature of 320-490 ℃ and consumes a large amount of dehydration heat, and the active oxide generated by decomposition is attached to the surface of the cement stone to further prevent the influence of geothermal heat, steam and flame on the inside of the cement stone. The high-temperature resistant fiber in the stabilizer has good enhancement effect under the high-temperature condition, and is cracked, softened and contracted when meeting fire, most of heat is taken away, the temperature of the surface of the cement sheath and the flame area is reduced, so that the compression strength of the cement sheath is prevented from declining, and the integrity of the cement sheath is maintained.
In the prior art, the density of the cement stone is improved mainly from the particle grading and particle size distribution directions, so that the high-temperature strength decay resistance of the cement stone is improved, and the problem of strength decay is solved from the perspective of cement hydration products by few researches. Therefore, it is important to develop a material suitable for high temperature environment to ensure that the cement strength is not degraded.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides a high-temperature strength decay resistant material for well cementation and a preparation method thereof. The high-temperature strength decay resistant material comprises, by weight, 55% -75% of lithium slag, 10% -20% of aerated concrete waste, 10% -20% of ceramic waste and 5% of carbon powder. The high-temperature strength decay resistant material is suitable for high-temperature environments, is doped into a cement slurry system to prepare the cement stone, and can ensure that the strength of the cement stone is not decayed in the high-temperature environments. The high-temperature strength decay resistant material has the characteristics of high compressive strength and high-temperature strength decay resistance.
In order to solve the problems in the prior art, the invention is realized by the following technical scheme.
The invention provides a high-temperature strength decay resistant material for well cementation, which comprises the following raw materials in percentage by weight:
lithium slag: 55% -75%;
10% -20% of aerated concrete waste;
ceramic waste: 10% -20%;
5% of carbon powder.
Further preferably, siO in the components of the lithium slag 2 ≥55%，Al 2 O 3 More than or equal to 25 percent, and the fineness of the powder is more than or equal to 600 meshes.
Further preferably, the main components of the aerated concrete waste are tobermorite and silicon dioxide, and the fineness of the powder is more than or equal to 600 meshes.
Further preferably, in the ceramic waste material, zrO 2 More than or equal to 95 percent, and the fineness of the powder is more than or equal to 600 meshes.
Further preferably, the content of the carbon powder effective substances is more than or equal to 98 percent, and the fineness of the powder is more than or equal to 600 meshes.
The second aspect of the invention provides a preparation method of a high-temperature strength decay resistant material for well cementation, which specifically comprises the following steps:
firstly, mixing lithium slag, aerated concrete waste, ceramic waste and carbon powder according to the proportion, drying, and then, passing through mill powder, wherein the fineness of the powder is controlled to be more than or equal to 600 meshes; the high-temperature strength decay resistant material for well cementation is obtained.
Compared with the prior art, the beneficial technical effects brought by the invention are as follows:
1. the high-temperature strength decay resistant material for well cementation can effectively improve the high-temperature compressive strength of cement stones and can ensure that the compressive strength of the cement stones is not decayed in a high-temperature environment.
2. The high-temperature strength decay resistant material for well cementation uses solid wastes such as lithium slag, aerated concrete waste, ceramic waste and the like as main raw materials, so that the pollution of the solid wastes to the environment can be greatly reduced; at the same time, the main component of the solid wastes is active SiO 2 And Al 2 O 3 The use of silica sand in a cement slurry system is greatly reduced; the invention has the characteristics of environmental protection, low cost and excellent performance, and reduces the material cost.
3. The high-temperature strength decay resistant material for well cementation ensures the calcium-silicon ratio and the high-temperature strength of a cement slurry system by utilizing the characteristic of high content of active silicon dioxide in lithium slag and aerated concrete waste. Ceramic wastes in the high temperature strength decay resistant material have a large amount of ZrO 2 Due to the excellent high temperature resistance, the high temperature strength and the high temperature resistance of the cement stone are further improved. The active alumina in the lithium slag is dissolved in the high-temperature hydration product tobermorite and the tobermorite in the aerated concrete waste to form aluminum-substituted tobermorite, so that the transformation of the tobermorite into tobermorite is prevented, and the high-temperature strength decay resistance of the cement stone is improved. Carbon powder is used as an inert material, is filled in the pores of the cement stone and forms certain defects, provides crystallization points for the formation of hydration products, promotes the hydration of cement, not only improves the early strength of the cement, but also improves the density of the cement stone, and further ensures the compressive strength of the cement stone at high temperature. According to the synergistic principle, the components are mixed according to a certain proportionThe high-temperature strength decay resistant material for well cementation has the characteristics of environmental protection, high temperature resistance, strength decay inhibition and low cost.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following examples all prepared cement slurries according to GB/T19139 standards, wherein the G-grade oil well cement is provided by Jiahua special cement Co., ltd, the high temperature retarder and the high temperature fluid loss agent are provided by Wei Hui commercial chemical Co., ltd, and the high temperature retarder is an AMPS polymer; high-temperature filtrate reducer 2-acrylamido-2-methylpropanesulfonic acid polymer; the high temperature stabilizer is clay mineral.
Example 1
As a preferred embodiment of the invention, the concrete components of the high-temperature strength decay resistant material for well cementation adopted in the embodiment are shown in the following table:
SiO in the components of the lithium slag 2 ≥55%，Al 2 O 3 More than or equal to 25 percent, and the fineness of the powder is more than or equal to 600 meshes. The main components of the aerated concrete waste material are tobermorite and silicon dioxide, and the fineness of the powder is more than or equal to 600 meshes. In the ceramic waste material, zrO 2 More than or equal to 95 percent, and the fineness of the powder is more than or equal to 600 meshes. The content of the effective substances of the carbon powder is more than or equal to 98 percent, and the fineness of the powder is more than or equal to 600 meshes. Mixing and grinding the raw materials in proportion, and controlling the fineness of powder to be more than or equal to 600 meshes; obtaining the high-temperature strength decay resistant material 1# product for well cementation.
Example 2
As a preferred embodiment of the invention, the concrete components of the high-temperature strength decay resistant material for well cementation adopted in the embodiment are shown in the following table:
SiO in the components of the lithium slag 2 ≥55%，Al 2 O 3 More than or equal to 25 percent, and the fineness of the powder is more than or equal to 600 meshes. The main components of the aerated concrete waste material are tobermorite and silicon dioxide, and the fineness of the powder is more than or equal to 600 meshes. In the ceramic waste material, zrO 2 More than or equal to 95 percent, and the fineness of the powder is more than or equal to 600 meshes. The content of the effective substances of the carbon powder is more than or equal to 98 percent, and the fineness of the powder is more than or equal to 600 meshes. Mixing and grinding the raw materials in proportion, and controlling the fineness of powder to be more than or equal to 600 meshes; obtaining the high-temperature strength decay resistant material No. 2 product for well cementation.
Example 3
As a preferred embodiment of the invention, the concrete components of the high-temperature strength decay resistant material for well cementation adopted in the embodiment are shown in the following table:
SiO in the components of the lithium slag 2 ≥55%，Al 2 O 3 More than or equal to 25 percent, and the fineness of the powder is more than or equal to 600 meshes. The main components of the aerated concrete waste material are tobermorite and silicon dioxide, and the fineness of the powder is more than or equal to 600 meshes. In the ceramic waste material, zrO 2 More than or equal to 95 percent, and the fineness of the powder is more than or equal to 600 meshes. The content of the effective substances of the carbon powder is more than or equal to 98 percent, and the fineness of the powder is more than or equal to 600 meshes. Mixing and grinding the raw materials in proportion, and controlling the fineness of powder to be more than or equal to 600 meshes; obtaining the high-temperature strength decay resistant material 3# product for well cementation.
Comparative example 1
G-grade oil well cement, 2% high-temperature stabilizer, 2% high-temperature retarder and 4% high-temperature fluid loss agent, cement slurry is prepared according to GB/T19139 standard, and the cement-cement ratio is 0.44, so that a No. 1 well cementation cement slurry system is obtained.
Example 4
G-grade oil well cement, 20% high-temperature strength decay resistant material 1# product, 2% high-temperature stabilizer, 2% high-temperature retarder and 4% high-temperature fluid loss agent, and cement paste with water cement ratio of 0.44 is prepared according to GB/T19139 standard, thus obtaining a No. 2 well cementation cement paste system.
Example 5
G-grade oil well cement, 20% high-temperature strength decay resistant material 2# product, 2% high-temperature stabilizer, 2% high-temperature retarder and 4% high-temperature fluid loss agent, and cement paste with water cement ratio of 0.44 is prepared according to GB/T19139 standard, thus obtaining a No. 3 well cementation cement paste system.
Example 6
G-grade oil well cement, 20% high-temperature strength decay resistant material 3# product, 2% high-temperature stabilizer, 2% high-temperature retarder and 4% high-temperature fluid loss agent, and cement paste with water cement ratio of 0.44 is prepared according to GB/T19139 standard, thus obtaining a No. 4 well cementation cement paste system.
Example 7
As a further preferred embodiment of the present invention, this example was conducted to test the engineering properties of cement slurries obtained in comparative example 1 and examples 4 to 6. The 210℃experiment was performed according to the following recipe: the experimental results are shown in the following table:
according to the experimental data in the table, each high-temperature engineering performance of the No. 1-4 well cementation cement slurry system can be obtained, and the construction requirements are met. The high-temperature strength decay resistant material has good compatibility with high-temperature retarders, fluid loss additives and the like, is safe, controllable in pumping time and short in transition time, and is beneficial to improving the construction safety of high-temperature well cementation operation.
Example 8
As a further preferred embodiment of the present invention, the cement paste samples obtained in comparative example 1 and examples 4 to 6 were poured into a copper mold for molding and then placed into a high temperature curing kettle for curing at 250℃for curing periods of 2d, 7d and 28d. Compressive strength was tested using a NYSQ-2017 press tester, and the test results are shown in the following table.
Table 1 shows the results of compressive strength testing of the cement paste systems of comparative example 1 and examples 4-6
From the data in the table, the compressive strength of the No. 1 cement paste system is low and the decay phenomenon occurs after the No. 1 cement paste system is maintained for a certain age, and the compressive strength of the No. 2 cement paste system is high and the decay phenomenon does not occur. The cement paste system provided by the technical scheme of the invention has good high-temperature resistance mainly because of the good high-temperature strength decay resistance material.
According to the case, after the specific high-temperature strength decay resistant material is added, the high-temperature strength stability of the well cementation cement is effectively improved, and the cement slurry system prepared by the embodiment has good high-temperature performance and can meet the performance requirement of cement slurry of high-temperature well cementation engineering.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.
Claims (3)
1. The high-temperature strength decay resistant material for well cementation is characterized by comprising the following raw materials in percentage by weight:
lithium slag: 55% -75%;
10% -20% of aerated concrete waste;
ceramic waste: 10% -20%;
5% of carbon powder;
SiO in the components of the lithium slag 2 ≥55%，Al 2 O 3 More than or equal to 25 percent, and the fineness of the powder is more than or equal to 600 meshes; the main components of the aerated concrete waste are tobermorite and silicon dioxide, and the fineness of the powder is more than or equal to 600 meshes; in the ceramic waste material, zrO 2 More than or equal to 95 percent, and the fineness of the powder is more than or equal to 600 meshes.
2. A high temperature strength decay resistant material for well cementing according to claim 1, wherein: the content of the effective substances of the carbon powder is more than or equal to 98 percent, and the fineness of the powder is more than or equal to 600 meshes.
3. The method for preparing the high-temperature strength decay resistant material for well cementation according to claim 1 or 2, which is characterized by comprising the following steps:
firstly, mixing lithium slag, aerated concrete waste, ceramic waste and carbon powder according to the proportion of claim 1, drying, grinding by a mill, and controlling the fineness of the powder to be more than or equal to 600 meshes; the high-temperature strength decay resistant material for well cementation is obtained.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104293329A (en) * | 2014-09-24 | 2015-01-21 | 中国石油大学(华东) | High-temperature well-cementing material system and composition thereof |
| CN109320120A (en) * | 2018-10-31 | 2019-02-12 | 嘉华特种水泥股份有限公司 | A kind of oil-well cement extra material for high temperature well cementation |
| CN111072350A (en) * | 2020-01-07 | 2020-04-28 | 嘉华特种水泥股份有限公司 | High-temperature-resistant well cementation cement slurry system |
| WO2022105557A1 (en) * | 2020-11-20 | 2022-05-27 | 中国石油天然气集团有限公司 | High-strength portland cement slurry for ultra-high-temperature cementing, preparation method therefor and application thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104293329A (en) * | 2014-09-24 | 2015-01-21 | 中国石油大学(华东) | High-temperature well-cementing material system and composition thereof |
| CN109320120A (en) * | 2018-10-31 | 2019-02-12 | 嘉华特种水泥股份有限公司 | A kind of oil-well cement extra material for high temperature well cementation |
| CN111072350A (en) * | 2020-01-07 | 2020-04-28 | 嘉华特种水泥股份有限公司 | High-temperature-resistant well cementation cement slurry system |
| WO2022105557A1 (en) * | 2020-11-20 | 2022-05-27 | 中国石油天然气集团有限公司 | High-strength portland cement slurry for ultra-high-temperature cementing, preparation method therefor and application thereof |
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