Plugging agent, preparation method and application thereof, and drilling fluid

A plugging agent and reaction technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low strength, insufficient rigidity of the plugging layer, insufficient retention performance of the plugging formation, etc., and achieve particle size matching. Good effect, improved temperature resistance, good lipophilic effect

Active Publication Date: 2022-03-15
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the Chinese patent document CN104448136A provides a preparation method of a plugging agent for oil-based drilling fluid: the aqueous phase containing propylene-based water-soluble organic monomer A, water-soluble cross-linking agent B and powdered inorganic material C is dropped Add it to oil D containing dispersant E, after emulsification, use the oxidation-reduction initiation system to initiate a stable suspension lost circulation plugging agent, but the temperature resistance of the plugging agent is 150°C, which is difficult to meet the requirements of oil-based drilling fluid in deeper formations. high temperature requirements
Chinese patent document CN105936819A provides a plugging agent for oil-based drilling fluid and its preparation method. It is formed by chemical reaction and physical mixing. Composed of lipophilic hard inorganic materials, although the composite resin plugging agent has certain plastic deformation characteristics, there is no chemical adsorption and other forces between it and the well wall, and the retention performance in the plugged formation is insufficient.
Chinese patent document CN111808224A provides a kind of copolymer and its preparation method and application as a lost circulation agent and oil-based drilling fluid and its application. The copolymer contains structural unit A, structural unit B, structural unit C, structural unit Copolymer of D and structural unit E, the copolymer can swell in oil, so as to seal formations of different scales, although it has good elasticity but insufficient rigidity
[0005]The existing conventional oil-based drilling fluid plugging agents have the following disadvantages: (1) poor lipophilicity, poor adaptability in oil-based drilling fluids, and cannot be effective (2) Insufficient particle size gradation makes it difficult to effectively reside in the formation pores, resulting in low strength of the formed plugging layer, which leads to poor plugging strength and is difficult to avoid Occurrence of lost circulation; (3) Insufficient temperature resistance, unable to adapt to the downhole high temperature formation environment

Method used

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  • Plugging agent, preparation method and application thereof, and drilling fluid
  • Plugging agent, preparation method and application thereof, and drilling fluid
  • Plugging agent, preparation method and application thereof, and drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0045] This embodiment provides a lost circulation agent, which can be used as a lost circulation agent while drilling for high temperature resistant oil-based drilling fluid. The preparation method of this leakage stoppage agent comprises:

[0046] 1. Add 6 g of methacrylic acid, 4 g of acrylamide, and 10 g of 2-(methacryloxy)ethyltrimethylammonium chloride into 200 mL of deionized water, and stir at a stirring rate of 400 r / min for 10 min to obtain a mixed solution .

[0047] 2. Keep the mixture stirred at a stirring rate of 400r / min, add 20g of dimethylaminoethyl methacrylate, 15g of hydroxyethyl methacrylate, 10g of sodium p-styrenesulfonate, 10g of sodium 4-hydroxybenzenesulfonate, Add 2g of emulsifier MS-1 into the mixture, and continue to stir for 20min at a stirring rate of 400r / min to obtain a pre-emulsion.

[0048] 3. Take 1 / 2 of the pre-emulsion and add it to a four-necked flask equipped with a stirrer, a condenser, and a dropping funnel, and pass nitrogen gas for...

Embodiment 2

[0050] This embodiment provides a lost circulation agent, which can be used as a lost circulation agent while drilling for high temperature resistant oil-based drilling fluid. The preparation method of this leakage stoppage agent comprises:

[0051] 1. Add 5 g of acrylic acid, 5 g of caprolactam, and 8 g of dimethyldiallyl ammonium chloride into 200 mL of deionized water, and stir at a stirring rate of 400 r / min for 10 min to obtain a mixed solution.

[0052] 2. Keep the mixed solution stirring at a stirring rate of 400r / min, add 20g of butyl acrylate, 10g of methyl methacrylate, 10g of styrene, 8g of N-vinylpyrrolidone, and 2g of emulsifier MS-1 into the mixed solution, and stir at 400r / min / min stirring rate and continue to stir for 20min to obtain a pre-emulsion.

[0053] 3. Take 1 / 2 of the pre-emulsion and add it to a four-necked flask equipped with a stirrer, a condenser, and a dropping funnel, and pass nitrogen gas for 20 minutes. After the temperature is raised to 60°C...

Embodiment 3

[0055] This embodiment provides a lost circulation agent, which can be used as a lost circulation agent while drilling for high temperature resistant oil-based drilling fluid. The preparation method of this leakage stoppage agent comprises:

[0056] 1. Mix 5g of acrylic acid, 5g of acrylamide, 4g of 2-acrylamido-2-methylpropanesulfonic acid, 5g of 2-(methacryloyloxy)ethyltrimethylammonium chloride, dimethyldiene 5 g of propylammonium chloride was added into 200 mL of deionized water, and stirred at a stirring rate of 400 r / min for 10 min to obtain a mixed solution.

[0057] 2. Keep the mixed liquid stirring at a stirring rate of 400r / min, add 20g of butyl acrylate, 20g of dimethylaminoethyl methacrylate, 10g of sodium p-styrenesulfonate, 10g of N-vinylpyrrolidone, 2g of emulsifier MS- 1 into the mixed solution and continue to stir for 20 min at a stirring rate of 400r / min to obtain a pre-emulsion.

[0058] 3. Take 1 / 2 of the pre-emulsion and add it to a four-necked flask equ...

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Abstract

The invention provides a plugging agent, a preparation method and application thereof, and a drilling fluid. The preparation method of the plugging agent comprises the following steps: mixing an acrylic monomer, an acrylamide monomer, a strong adsorption monomer, an acrylate monomer, a high-temperature-resistant monomer and an emulsifier with water to form a pre-emulsion; taking 1/3-2/3 of the pre-emulsion, introducing nitrogen, adding an initiator, and carrying out a first reaction; and then adding the rest of the pre-emulsion, the crosslinking agent and the resin material, and carrying out a second reaction to obtain the plugging agent. The invention further provides the plugging agent obtained by the preparation method and a drilling fluid containing the plugging agent. The plugging agent provided by the invention has lipophilicity and high-temperature resistance, is well matched with the oil-based drilling fluid, has excellent plugging performance, and can be used as a high-temperature-resistant oil-based drilling fluid plugging agent while drilling.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to a plugging agent, a preparation method and application thereof, and a drilling fluid. Background technique [0002] Lost circulation is one of the three major technical problems in drilling engineering. During the drilling of difficult wells and unconventional shale oil and gas wells, lost circulation problems often occur. According to statistics, the occurrence rate of lost circulation accounts for 20%-25% of the total number of drilling wells in the world. Lost circulation will not only cause huge economic losses to the drilling project, but also lead to a serious drop in well pressure, which will have a great impact on the stability of the inner wall of the oil well. In severe cases, it will lead to blowout accidents, which seriously threaten the safety of drilling operations. sex. [0003] In recent years, as the exploration and development of oil and gas reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/34C08F220/20C08F212/14C08F220/06C08F220/56C08F212/36C08F220/18C08F220/14C08F212/08C08F226/10C08F226/02C08F222/38C08F220/58C08G81/02C09K8/42C09K8/512C09K8/88C09K8/035
CPCC08F220/34C08F220/1804C08G81/024C09K8/426C09K8/512C09K8/887C09K8/035C08F220/20C08F212/30C08F220/06C08F220/56C08F212/36C08F220/14C08F212/08C08F226/10C08F226/02C08F222/385C08F220/585Y02P20/141
Inventor 王建华闫丽丽程荣超倪晓骁张家旗冯杰杨峥崔小勃刘人铜高珊杨海军惠保同
Owner BC P INC CHINA NAT PETROLEUM CORP
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