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Flexible material composition, flexible material and its preparation method, plugging agent and its application

A flexible material and plugging agent technology, applied in the field of drilling fluid, can solve the problems of weak pressure bearing capacity of the plugging layer, inability to automatically remove plugging, weak self-adaptive ability, etc., and achieve high plugging success rate and low impact on drilling fluid performance Small, Adaptive Effects

Active Publication Date: 2022-04-05
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the weak self-adaptability, narrow plugging range, low plugging success rate, unsuitability for oil layer plugging, inability to automatically remove plugging, and the formed plugging layer of existing plugging agents. The defect of weak pressure bearing ability

Method used

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  • Flexible material composition, flexible material and its preparation method, plugging agent and its application
  • Flexible material composition, flexible material and its preparation method, plugging agent and its application
  • Flexible material composition, flexible material and its preparation method, plugging agent and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1

[0079] (1) Prepare the composition according to the following components and contents:

[0080] Acrylamide, 100 parts by weight;

[0081] Dimethyl diallyl ammonium chloride, 30 parts by weight;

[0082] Ammonium persulfate, 3 parts by weight;

[0083] N, N'-methylenebisacrylamide, 10 parts by weight;

[0084]Water (deionized water), 260 parts by weight.

[0085] (2) Preparation of flexible materials:

[0086] The composition prepared in step (1) is added to the container, and each component in the composition is dissolved in water to obtain a mixed solution. First, at room temperature (20° C.), nitrogen protection was passed through the mixed solution, and stirred for 25 min to obtain a first mixture. Then, the temperature of the first mixture was adjusted to 55° C., nitrogen flow and stirring were stopped, and the first mixture was allowed to stand at this temperature for 4 hours to obtain a gel-like second mixture. Finally, the second mixture is dried until the moistur...

Embodiment A2-A5

[0088] Carry out according to the method of embodiment A1, the difference is that embodiment A2-A5 changes the content of each component in the composition respectively, specifically as shown in Table 1, and the products obtained are recorded as A2-A5 respectively.

[0089] Table 1

[0090]

Embodiment B1

[0103] (1) Prepare the composition according to the following components and contents:

[0104] Flexible material: 100 parts by weight; A1;

[0105] Oil-soluble resin: 65 parts by weight; purchased from Shandong Deshunyuan Petroleum Technology Co., Ltd., brand EP-1;

[0106] Fiber: 50 parts by weight; Polypropylene fiber (Zibo Longen Fiber Co., Ltd., TP-2);

[0107] Asphalt: 70 parts by weight; purchased from Shandong Deshunyuan Petroleum Technology Co., Ltd., brand FF-Ⅱ;

[0108] Rigid material: 85 parts by weight; calcium carbonate with a particle size of 100 mesh to 200 mesh.

[0109] (2) Put the flexible material, oil-soluble resin and asphalt prepared in step (1) into the mixer, and mix for 15 minutes; then continue to add fibers and rigid materials, and mix for 15 minutes. The final lost circulation agent is obtained, denoted as B1.

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Abstract

The invention relates to the field of drilling fluid, in particular to a flexible material composition, a flexible material and a preparation method thereof, a plugging agent and an application thereof. The flexible material composition contains acrylamide, dimethyl diallyl ammonium chloride, ammonium persulfate and N,N'-methylenebisacrylamide, relative to 100 parts by weight of the acrylamide, the The content of dimethyl diallyl ammonium chloride is 10-50 parts by weight, the content of the ammonium persulfate is 0.5-10 parts by weight, and the content of the N,N'-methylenebisacrylamide is 2 -20 parts by weight. The flexible material prepared from the flexible material composition of the present invention and the further prepared lost circulation agent have a high plugging rate, and also have strong adaptability to geological conditions, strong temperature resistance, little influence on drilling fluid performance, When applied to oil layers, it can automatically remove plugging, and the formed plugging layer has the characteristics of strong pressure bearing capacity.

Description

technical field [0001] The invention relates to the field of drilling fluids, in particular to a flexible material composition, a flexible material prepared from the flexible material composition, a preparation method of the flexible material, a plugging agent containing the flexible material, and the plugging agent application of the agent. Background technique [0002] The low degree of compaction of deep-water formations makes the formation fracture pressure gradient of deep-water wells decrease under the same well depth, that is, the pressure bearing capacity of formations becomes weaker, resulting in a narrow window between the fracture pressure gradient and formation pore pressure gradient, and wellbore failures are prone to occur. Complex situations such as stability and well leakage. Therefore, it is an important measure to ensure the safety and efficiency of deepwater drilling to improve the pressure bearing capacity of formations that are prone to leakage or colla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F226/02C08F222/38C09K8/42
CPCC08F220/56C09K8/426C09K2208/08C08F226/02C08F222/385
Inventor 李中郭永宾黄熠颜帮川吕开河陈浩东杜威吴旭东胡文军管申邢希金向雄
Owner CHINA NAT OFFSHORE OIL CORP
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