CN-121991650-A - Intensity stabilizer, temporary plugging agent and preparation method and application thereof

Abstract

The invention discloses a strength stabilizer, a temporary plugging agent, a preparation method and application thereof. The strength stabilizer is modified aerogel, and is modified by dodecyl trimethoxy silane, gamma-glycidyl ether oxypropyl trimethoxy silane and sodium glycinate, and is used in temporary plugging agent, and carboxylate of the modified aerogel can carry out complexation reaction with calcium ions in calcium silicate salt, so that the curing capacity of the temporary plugging agent is obviously improved. The temporary plugging agent prepared has excellent temperature resistance, high pressure-bearing plugging capability and plugging removal capability, and achieves the aim of well leakage prevention and control collaborative reservoir protection.

Inventors

• LI LONG
• CHEN SHILIN
• ZHOU YU
• WANG SHUANGWEI
• ZHANG YAN
• GAO SHAN
• LI SHUANG
• QIAN DIANCUN

Assignees

• 中国石油天然气股份有限公司
• 中国石油集团工程技术研究院有限公司

Dates

Publication Date

20260508

Application Date

20260205

Claims (10)

1. 1. A strength stabilizer, wherein the strength stabilizer is a modified aerogel having the following structural formula: Wherein A represents an aerogel.
2. 2. The strength stabilizer of claim 1, wherein the aerogel is a nanocellulose aerogel.
3. 3. A method of preparing the strength stabilizer according to claim 1 or 2, wherein the method of preparing comprises the steps of: Adding aerogel into a first solvent, adding dodecyl trimethoxy silane and gamma-glycidyl ether oxypropyl trimethoxy silane, regulating the pH to 4, heating to perform a first reaction, and freeze-drying after the reaction is finished to obtain an intermediate; Adding the intermediate into a second solvent, adding sodium glycinate, adjusting the pH value to 9, stirring at room temperature to perform a second reaction, and freeze-drying after the reaction is finished to obtain the modified aerogel.
4. 4. The preparation method according to claim 3, wherein the mass ratio of the aerogel, dodecyl trimethoxysilane, gamma-glycidoxypropyl trimethoxysilane and sodium glycinate is 15 (3-5): 1-3): 1.5-3.5.
5. 5. The production method according to claim 3, wherein the first solvent is a mixed solvent of ethanol and water, and the second solvent is a mixed solvent of dichloromethane and water.
6. 6. The process according to claim 3, wherein the pH is adjusted to 4 with acetic acid and to 9 with triethylamine.
7. 7. A production method according to claim 3, wherein the temperature of the first reaction is 50 to 70 ℃ for 6 to 12 hours; the temperature of the second reaction is room temperature and the time is 8-12 hours.
8. 8. The temporary plugging agent comprises the following components in parts by mass: 10-40 parts of curing agent, 5-10 parts of retarder, 20-30 parts of filter aid, 10-20 parts of strength stabilizer according to claim 1 or 2, 0.5-1 part of dispersing agent and 3-5 parts of water; The curing agent is at least one selected from tricalcium silicate, dicalcium silicate, monocalcium silicate, anhydrous calcium sulfoaluminate and calcium sulfate; The retarder is at least one selected from sodium pyrophosphate, citric acid, boric acid and sodium hexametaphosphate; The filter aid is at least one selected from diatomite, basalt fiber and sepiolite; the dispersing agent is selected from polyacrylate and polyether amine modified styrene-maleic anhydride copolymer.
9. 9. A method of preparing the temporary plugging agent of claim 8, wherein the method of preparing comprises the steps of: And uniformly mixing the curing agent, the retarder, the filter aid, the strength stabilizer and the dispersing agent to obtain a solid mixture, adding water, and uniformly stirring to obtain the temporary plugging agent.
10. 10. Use of the temporary plugging agent of claim 8 in deep or ultra-deep hydrocarbon reservoirs.

Description

Intensity stabilizer, temporary plugging agent and preparation method and application thereof Technical Field The invention relates to the field of petroleum drilling fluid, in particular to a strength stabilizer, a temporary plugging agent, a preparation method and application thereof. Background At present, oil-based drilling fluids are widely used by virtue of their excellent lubricity and high temperature stability. However, when drilling and encountering complex oil and gas reservoirs, multi-scale cracks and even fracture holes develop, well leakage frequently occurs in the well drilling and completion process, and the once success rate of temporary plugging is generally lower than 40%. Repeated plugging operation causes a large amount of working fluid and plugging materials to invade the reservoir, and serious reservoir damage is induced. Aiming at oil-based drilling fluid leakage, the technology of bridging leakage blocking, polymer leakage blocking and the like is mainly relied on. The conventional bridging plugging technology generally adopts shell materials, the one-time plugging success rate is about 30%, and the polymer materials adopted by the polymer plugging technology are easy to degrade under the high-temperature condition and have poor long-term pressure-bearing stability. In addition, the cement plugging technology is used as a traditional plugging means and is widely applied to deep well and ultra-deep well drilling engineering. However, the hydration reaction of the existing cement-based plugging material in an oil-containing environment is greatly delayed to weaken, so that the material is difficult to solidify or the solidifying strength is insufficient, and the pressure bearing capacity is usually lower than 3MPa. In addition, the acid dissolution rate of the cement-based plugging material is less than 30%, so that an oil and gas migration channel cannot be effectively recovered, and permanent damage to a reservoir is caused. In general, the existing cement plugging materials have the problems of low plugging strength, difficult plugging removal and the like in oil-based drilling fluid wells, so that the efficient development of complex oil and gas reservoirs is severely restricted, and the subsequent reservoir reconstruction and yield increase measures are high in cost. Therefore, development of a novel temporary plugging material which has strong self-adaptability and good degradability and can effectively resist pollution of oil-based drilling fluid is needed to realize the goal of integration of lost circulation prevention and control and efficient plugging removal. Disclosure of Invention The invention aims to provide a strength stabilizer, a temporary plugging agent and a preparation method and application thereof, so as to solve the technical problems of poor pressure-bearing plugging capability and high plugging removal difficulty in the prior art. In order to achieve the above purpose, the present invention adopts the following technical scheme: The first aspect of the present invention provides a strength stabilizer, wherein the strength stabilizer is a modified aerogel, and the modified aerogel has the following structural formula: Wherein A represents an aerogel. The modified aerogel is obtained by modifying dodecyl trimethoxy silane, gamma-glycidyl ether oxypropyl trimethoxy silane and sodium glycinate. Preferably, the strength stabilizer according to the present invention, the aerogel is a nanocellulose aerogel. The second aspect of the present invention provides a method for preparing the strength stabilizer, wherein the method comprises the following steps: Adding aerogel into a first solvent, adding dodecyl trimethoxy silane and gamma-glycidyl ether oxypropyl trimethoxy silane, regulating the pH to 4, heating to perform a first reaction, and freeze-drying after the reaction is finished to obtain an intermediate; Adding the intermediate into a second solvent, adding sodium glycinate, adjusting the pH value to 9, stirring at room temperature to perform a second reaction, and freeze-drying after the reaction is finished to obtain the modified aerogel. According to the preparation method of the strength stabilizer, preferably, the mass ratio of the aerogel, the dodecyl trimethoxy silane, the gamma-glycidyl ether oxypropyl trimethoxy silane and the sodium glycinate is 15 (3-5): 1-3): 1.5-3.5. According to the preparation method of the strength stabilizer of the present invention, preferably, the first solvent is a mixed solvent of ethanol and water. More preferably, the volume ratio of ethanol to water is from 90:10 to 95:5. According to the preparation method of the strength stabilizer of the present invention, preferably, the second solvent is a mixed solvent of dichloromethane and water. More preferably, the volume ratio of dichloromethane to water is 70:30. In the preparation method of the strength stabilizer, the dosage of the first solvent and the second solvent is