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Ultra-high temperature-resistant water-based drilling fluid

A water-based drilling fluid and ultra-high temperature technology, applied in the field of drilling fluid, can solve the problems of poor stability of high-temperature drilling fluid and weakened comprehensive performance.

Active Publication Date: 2018-01-26
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although the polymer molecules are designed for temperature resistance, the damage to the polymer molecular chain structure in the prior art still exists due to high temperature, resulting in poor stability of high-temperature drilling fluids, especially in ultra-high temperature environments, and the overall performance is weakened The trend is more significant

Method used

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preparation example Construction

[0053] In the present invention, the preparation method of the rheological stabilizer preferably comprises the following steps:

[0054] The oil phase and the water phase are mixed and subjected to primary heat treatment to obtain an oil-water mixture;

[0055] mixing the oil-water mixture and the initiator for secondary heat treatment to obtain a mixture including the initiator;

[0056] The mixture including the initiator and the crosslinking agent are mixed to carry out a polymerization reaction to obtain a rheological stabilizer.

[0057] In the invention, the oil phase and the water phase are mixed and subjected to primary heat treatment to obtain the oil-water mixture. In the present invention, the temperature of the primary heat treatment is preferably 40-50°C, more preferably 42-48°C, most preferably 44-46°C; the time of the primary heat treatment is preferably 1-3 hours , specifically can be 1 hour, 2 hours or 3 hours. In the present invention, the first-stage heat...

Embodiment 1

[0071] Mix 12.5 g of Span 80, 10 g of oleic acid diethanolamide and 2.5 g of fumed silicon dioxide to obtain an emulsifier, and mix 500 g of white oil and 25 g of the emulsifier to obtain an oil phase.

[0072] 196.875 g of 2-acrylamido-2-methylpropanesulfonic acid, 262.5 g of N,N-diethylacrylamide, 131.25 g of methacrylic acid and 65.625 g of acrylamide were mixed to obtain an aqueous phase.

[0073] 32.8125 g of ammonium persulfate and 32.8125 g of sodium persulfate were mixed to obtain an initiator.

[0074] Weigh 65.625 g of diacetone acrylamide as a crosslinking agent.

[0075] Mix the oil phase and the water phase, heat treatment at 40°C for 1.5 hours to obtain an oil-water mixture;

[0076] mixing the oil-water mixture and the initiator, and heating at 60°C for 2 hours to obtain a mixture including the initiator;

[0077] The mixture including the initiator and the crosslinking agent were mixed, and polymerized at 50° C. for 5 hours to obtain a rheological stabilizer....

Embodiment 2

[0079] Mix 8 g of Span 80 and 12 g of oleic acid diethanolamide to obtain an emulsifier, and mix 500 g of white oil and 20 g of the emulsifier to obtain an oil phase.

[0080] 148.56 g of 2-acrylamido-2-methylpropanesulfonic acid, 148.56 g of N,N-diethylacrylamide, 148.56 g of methacrylic acid, and 148.56 g of acrylamide were mixed to obtain an aqueous phase.

[0081] Weigh 18.57g of benzoyl peroxide as initiator.

[0082] 9.29 g of methylenebisacrylamide and 9.29 g of N-hydroxyethylacrylamide were mixed to obtain a crosslinking agent.

[0083] Mix the oil phase and the water phase, heat treatment at 40°C for 1.5 hours to obtain an oil-water mixture;

[0084] mixing the oil-water mixture and the initiator, and heating at 80°C for 2 hours to obtain a mixture including the initiator;

[0085] The mixture including the initiator and the crosslinking agent were mixed, and polymerized at 50° C. for 5 hours to obtain a rheological stabilizer.

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Abstract

The invention provides an ultra-high temperature-resistant water-based drilling fluid. The ultra-high temperature-resistant water-based drilling fluid comprises clay, an alkalinity regulator, a rheological stabilizer, a fluid loss control agent, an inhibitor, a lubricant and water. The rheological stabilizer is prepared from 40 to 56 portions by mass of an oil phase, 40 to 56 portions by mass of an aqueous phase, 2 to 5 portions by mass of an initiator and 2 to 5 portions by mass of a cross-linking agent. The oil phase comprises white oil and an emulsifier. The aqueous phase comprises 2-acrylamido-2-methylpropanesulfonic acid, N, N-diethyl acrylamide, methacrylic acid and acrylamide. The embodiment result shows that after ultra-high temperature aging at 260 DEG C, the drilling fluid has micron and submicron-level spherical aggregation-state structures. The nanometer spherical molecular polymer rheological stabilizer has good temperature resistance. Through synergism of spherical aggregation-state structure reinforcement and drilling fluid components, the ultra-high temperature stability of the drilling fluid is improved.

Description

technical field [0001] The invention relates to the technical field of drilling fluids, in particular to an ultra-high temperature resistant water-based drilling fluid. Background technique [0002] Drilling fluid is a kind of complex multiphase fluid composed of solvent, bentonite, functional treatment agent and other components. Its performance is determined by the cooperation of treatment agent and solvated clay, and directly affects the drilling quality and economic benefits. Therefore, drilling fluid is also called Known as the "blood" of the drilling process. In recent years, in order to enhance the self-support ability of my country's oil and gas resources, drilling engineering has gradually shifted to deep land formations with more complex geological conditions. However, due to the ultra-high temperature (>204°C) environment of land deep wells (or ultra-deep wells), the drilling fluid treatment agent will encounter a high temperature environment during the wellbo...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/035C09K8/24
Inventor 许林许明标高涵由福昌
Owner ZHEJIANG OCEAN UNIV
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