High polymer modified rubber leaking stoppage material for oil-based drilling fluid leaking stoppage and preparation method thereof

A technology of oil-based drilling fluid and polymer modification, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor plugging effect and insufficient retention of ordinary rubber, so as to improve the plugging effect. performance, solving residency difficulties, and improving residency

Pending Publication Date: 2022-02-22
SINOPEC SSC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rubber is a common lipophilic material with good elastic deformability, abundant sources, and cheap price. It is often used as a deformable filling plugging material, but it is the same as conventional inert materials. Insufficient retention of rubber, resulting in poor plugging effect

Method used

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  • High polymer modified rubber leaking stoppage material for oil-based drilling fluid leaking stoppage and preparation method thereof
  • High polymer modified rubber leaking stoppage material for oil-based drilling fluid leaking stoppage and preparation method thereof
  • High polymer modified rubber leaking stoppage material for oil-based drilling fluid leaking stoppage and preparation method thereof

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preparation example Construction

[0037] The invention provides a method for preparing a polymer-modified rubber plugging material for oil-based drilling fluid plugging, comprising:

[0038] High polymer containing active groups, rubber, solvent, oil-soluble cross-linking agent, oil-soluble initiator are mixed, heated for reaction, and shear granulated to obtain a weakly cross-linked polymer for oil-based drilling fluid plugging;

[0039] The high polymer containing active groups is one or more of polybutadiene, polyisoprene, polybutadiene-styrene, polyacrylonitrile-butadiene-styrene and the like.

[0040] The preparation method of the high polymer modified rubber plugging material for oil-based drilling fluid plugging provided by the invention mixes the high polymer containing active groups, rubber, solvent, oil-soluble cross-linking agent and oil-soluble initiator.

[0041] First, the high polymer containing active groups is dissolved in a solvent or heated and melted, and stirred.

[0042] The polymer cont...

Embodiment 1

[0077] Dissolve 20g of polybutadiene in ethyl acetate, add 2g of waste tire rubber powder, 0.8g of cross-linking agent divinylbenzene, 0.8g of initiator AIBN after fully dissolving, stir well, heat to 80°C, polymerize for 6h, Granulation to obtain a polymer plugging material with a core-shell structure, in which the structural formula of the weakly crosslinked shell (left) and the entire core-shell structure (right) are:

[0078]

[0079] Wherein, the molecular weight is 250,000-330,000, m, p is the degree of polymerization, and the range is m:p=(450-560):(4100-5100).

Embodiment 2

[0081] Dissolve 20g of polyisoprene in ethyl acetate, add 2g of natural rubber powder after fully dissolving, add 0.8g of crosslinking agent divinylbenzene, 0.8g of initiator BPO, stir well, heat to 80°C, and polymerize for 6h , granulated to obtain a polymer plugging material with a core-shell structure, in which the structural formula of the weakly cross-linked shell (left) and the entire core-shell structural formula (right) are:

[0082]

[0083] Wherein, the molecular weight is 280,000-350,000, m, p is the degree of polymerization, and the range is m:p=(400-750):(3400-4500).

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Abstract

The invention provides a preparation method of a high polymer modified rubber leaking stoppage material for leaking stoppage of oil-based drilling fluid. The preparation method comprises the following steps: mixing a high polymer containing active groups, rubber, a solvent, an oil-soluble cross-linking agent and an oil-soluble initiator, heating to react, and granulating to obtain a weak cross-linked high polymer for leaking stoppage of oil-based drilling fluid, wherein the high polymer containing active groups is one or more of polybutadiene, polyisoprene, polybutadiene-styrene, polyacrylonitrile-butadiene-styrene and the like. A high polymer containing active groups is adopted to modify common rubber to form a core-shell structure product, common rubber powder is taken as a core, and the high polymer is taken as a shell. The high polymer shell can absorb oil and become sticky in an oil phase environment at 80-120 DEG C, has good cohesiveness, and improves the residence capacity of the rubber by bonding leakage layer rock and other leakage stopping materials. The modified rubber is in a solid state at normal temperature, has small influence on the rheological property of the oil-based drilling fluid, and can be conveniently pumped to a leakage layer.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a high polymer modified rubber plugging material for oil-based drilling fluid plugging and a preparation method thereof. Background technique [0002] With the increasing demand for energy in my country and the deepening exploration and development of unconventional oil and gas resources, more and more complex formations are encountered at this time, and the demand for oil-based drilling fluid plugging technology is gradually increasing. The development and application of materials suitable for oil-based drilling fluid plugging are relatively slow. At present, conventional plugging materials such as rigid granular materials of different particle sizes, fiber materials, and deformable materials are still used for plugging in China. However, most of these conventional plugging materials are hydrophilic and have poor compatibility in oil-based drilling fluids, resulting ...

Claims

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Application Information

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IPC IPC(8): C09K8/44C09K8/512
CPCC09K8/44C09K8/512
Inventor 张县民姜雪清黄宁郝纪双郭建华王中华
Owner SINOPEC SSC
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