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Reservoir protection agent composition, drilling fluid containing reservoir protection agent composition and application thereof

A technology of reservoir protection agent and composition, which is applied in the field of oil drilling, can solve problems such as unsatisfactory protection effect of fractured reservoirs, difficult to accurately grasp the characteristics of reservoir fractures, unsatisfactory temporary plugging effect, etc., to achieve reservoir protection Excellent performance, improved reservoir protection ability, good elasticity and toughness

Active Publication Date: 2017-04-19
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among them, the shielding temporary plugging technology has the following problems: First, in order to produce a good shielding temporary plugging effect, it is necessary to accurately understand the width and distribution characteristics of reservoir fractures. Due to the heterogeneity of the reservoir, the characteristics of reservoir fractures are difficult to be accurate Second, the temporary plugging material needs to enter the fracture to generate plugging. The plugging layer prevents the drilling fluid from entering the reservoir and also prevents the oil and gas from entering the wellbore. Therefore, after drilling and completion must be unblocked
At the same time, the existing protective materials lack components with good elasticity and toughness, and the protection effect on fractured reservoirs is not ideal

Method used

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  • Reservoir protection agent composition, drilling fluid containing reservoir protection agent composition and application thereof
  • Reservoir protection agent composition, drilling fluid containing reservoir protection agent composition and application thereof
  • Reservoir protection agent composition, drilling fluid containing reservoir protection agent composition and application thereof

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preparation example Construction

[0043] In the reservoir protective agent composition of the present invention, the preparation method of the intermediate product may comprise: mixing acrylamide, cationic monomer, crosslinking agent, toughening material and water, adding an initiator to the resulting mixture for reaction, and then The reaction product is dried and pulverized.

[0044] Preferably, the method of mixing acrylamide, cationic monomer, crosslinking agent, toughening material and water includes: (1) adding acrylamide, cationic monomer and crosslinking agent into water to dissolve and stirring evenly; (2) ) Add the toughening material to the mixture in step (1), and stir evenly; (3) Stir the mixture in step (2) under a protective atmosphere. Wherein, the protective atmosphere may be nitrogen and / or inert gas, and the stirring time in step (3) may be 20-30 min.

[0045] Preferably, the conditions of the reaction include: the temperature is 30-60°C, and the time is 3-5h. The protective atmosphere and...

Embodiment

[0060] The present invention will be described in detail through examples below, but the present invention is not limited thereby. In the following, preparation examples, examples and comparative examples, unless otherwise specified, the materials used are all commercially available, and the methods used are all conventional methods in the art.

[0061] Polyester fiber was purchased from Shenzhen Tianzhitu Technology Co., Ltd., the brand name is TZT-PET-6.

[0062]Polyacrylonitrile fiber was purchased from Shenzhen Tianzhitu Technology Co., Ltd., the brand name is TZT-PAN-6.

[0063] The zero-permeability drilling fluid treatment agent was purchased from Hebei Huayun Hongye Chemical Co., Ltd., with the brand name HY-3000.

[0064] The ultra-low permeability drilling fluid treatment agent was purchased from Shijiazhuang Hualai Dingsheng Technology Co., Ltd., and the brand is YP-4.

preparation example 1

[0066] This preparation example is used to illustrate the preparation method of polymer elastic particles.

[0067] Add 20kg of acrylamide, 4kg of dimethyl diallyl ammonium chloride and 0.01kg of N,N'-methylenebisacrylamide into 67.96kg of water, fully dissolve, then add 8kg of bentonite, and stir evenly. Add the above-mentioned reaction solution into the reactor equipped with a stirrer, a condenser, and a thermometer, pass through nitrogen protection, stir for 20 minutes, then adjust the temperature to 60°C, add 0.03kg of ammonium persulfate, stop nitrogen and stirring, and react 3h; the reaction product was taken out, dried at 105°C for 15h, and pulverized to obtain an intermediate product of granular reservoir protection agent.

[0068] Take 10kg of intermediate product and 5kg of sodium carbonate, add 79.95kg of water and continuously stir for 10h, then add 5kg of sodium chloride and 0.05kg of octadecyltrimethylammonium chloride, and continue stirring for 0.5h to obtain po...

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Abstract

The invention relates to the technical field of petroleum drilling and discloses a reservoir protection agent composition, a drilling fluid containing the reservoir protection agent composition and application thereof. The reservoir protection agent composition contains polymer elastic granules, and at least one of synthetic fibre and a film-forming agent. The polymer elastic granules contain specific contents of an intermediate product, alkali, salt and water. The intermediate product is prepared from raw materials including specific contents of acrylamide, a cationic monomer, a cross-linking agent, an initiator, a toughening material and water. The reservoir protection agent composition can help effectively prevent a drilling fluid from invading into a fractured reservoir and rapidly seal fractures in the fractured reservoir. The sealing rate is high, and sealing layer is easy to flow back. The reservoir protection agent composition is simple to use, and has good environmental protection performance and excellent reservoir protection performance.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a reservoir protection agent composition, a drilling fluid containing the reservoir protection agent composition and applications thereof. Background technique [0002] Drilling fluid plays an important role in the drilling process, and the performance of drilling fluid determines the success or failure of drilling to a certain extent. Excellent drilling fluid performance is one of the important guarantees to ensure safe, high-quality, efficient and rapid drilling production operations, and it can also effectively protect reservoirs and achieve high oil and gas recovery. During the drilling process, if the performance of the drilling fluid, especially the reservoir protection performance, is not ideal, it will cause the liquid and solid in the drilling fluid to invade the reservoir, reduce the permeability of the reservoir near the wellbore, and increase the resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/24C09K8/512
CPCC09K8/03C09K8/24C09K8/512C09K2208/08E21B21/003E21B33/138
Inventor 吕开河孙金声刘敬平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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