Degradable self-plugging-removal temporary plugging agent for reservoir drilling fluid, and preparation method thereof

A technology of drilling fluid and self-plugging removal, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as uncontrollable drilling fluid filtration effect, plugging rate, and permeability recovery value defects, etc., to achieve Improve blending performance, good degradability, and achieve the effect of degradation

Inactive Publication Date: 2021-10-26
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] CN103834369A discloses a self-removing plugging fluid for drilling carbonate rock reservoirs. The drilling fluid includes 5-16 parts by mass of a composite self-removing temporary plugging agent, 2-6 parts by mass of a fluid loss reducer, 0.1 -0.8 parts by mass of viscosifier, 0.1-0.5 parts by mass of pH regulator, 0.1-0.5 parts by mass of waterproof locking agent, 0-7 parts by mass of potassium chloride and 0-230 parts by mass of weighting agent, with good fluid loss and wall building The recovery value of carbonate rock core permeability is > 87%, no need to use gel breaking fluid, but the self-plugging temporary plugging agent still needs to be deplugged by pickling
The problem is that hydrophobic modification may lead to uncontrollable fluid loss of drilling fluid
[0010] Aiming at the current problems of self-unplugging drilling fluids, a variety of polymers or bio-enzyme materials have been disclosed as plugging agents, but they still have certain defects in terms of plugging rate and permeability recovery value, and further research is needed. Research and development of new self-plugging materials

Method used

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  • Degradable self-plugging-removal temporary plugging agent for reservoir drilling fluid, and preparation method thereof
  • Degradable self-plugging-removal temporary plugging agent for reservoir drilling fluid, and preparation method thereof
  • Degradable self-plugging-removal temporary plugging agent for reservoir drilling fluid, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This example is to illustrate the degradable self-blocking temporary plugging agent prepared by the method of the present invention.

[0062] The preparation steps are as follows:

[0063] (1) Weigh 50 parts of lactide and 1 part of N-vinylpyrrolidone respectively into a polymerization tube, and add a certain amount of catalyst stannous octoate. Use an inert gas to remove oxygen; wait until the lactide crystals and polyvinylpyrrolidone are completely melted, shake it to make it fully mix with the catalyst, raise the temperature to 160°C and react for a certain period of time.

[0064] (2) Take it out after cooling down, purify it with acetone and dissolve it in deionized water. The precipitated polymer precipitate is the biodegradable temporary plugging material.

[0065] (3) Under vacuum and high pressure conditions, crush the biodegradable temporary plugging material into a powder state of 400 mesh, marked as S1.

[0066] In addition, the degradable self-blocking re...

Embodiment 2

[0068] This example is to illustrate the degradable self-blocking temporary plugging agent prepared by the method of the present invention.

[0069] Prepare biodegradable temporary plugging material according to the same method as in Example 1;

[0070] The difference is that the acid-soluble temporary plugging particles are a combination of magnesium carbonate, alumina and calcium lactate, the composition ratio of the components is 1:0.5:0.4, and the mass ratio of the biodegradable self-degrading plugging material to the acid-soluble temporary plugging material is 1: 1.

Embodiment 3

[0072] This example is to illustrate the degradable self-blocking temporary plugging agent prepared by the method of the present invention.

[0073] Prepare biodegradable temporary plugging material according to the same method as in Example 1;

[0074] The difference is that the acid-soluble temporary plugging particles are a combination of aluminum carbonate, aluminum oxide and calcium gluconate, the component ratio is 1:0.43:0.26, and the mass ratio of biodegradable self-degrading plugging materials to acid-soluble temporary plugging materials is 2 :3.

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Abstract

The invention relates to the technical field of oil and gas well development, and concretely relates to a degradable self-plugging-removal temporary plugging agent for water-based solid-free reservoir drilling fluid suitable for oil and gas well drilling, and a preparation method thereof The degradable self-plugging-removal temporary plugging agent for the reservoir drilling fluid is a blend of a biodegradable polymer temporary plugging material and acid-soluble temporary plugging particles. Practice proves that acidification degradation can be generated within a period of time after well completion, the temporary plugging rate of the temporary plugging agent is greater than or equal to 98%, the plugging removal rate is greater than or equal to 99%, and the reservoir core permeability recovery value is greater than or equal to 95%; meanwhile, the temporary plugging agent disclosed by the invention has a self-plugging-removal capability, self-plugging removal can be realized by hydrating and decomposing a self-generated acid solution through a biological degradable material during later reverse drainage, the processes of removing mud cakes through acid pickling and the like are not needed, secondary damage to a reservoir is avoided, and the temporary plugging agent is a simple, convenient, efficient and side-effect-free temporary plugging technology.

Description

technical field [0001] The invention relates to the technical field of oil and gas well development, in particular to a degradable self-plugging temporary plugging agent for water-based solid-free reservoir drilling fluid suitable for oil and gas well drilling and a preparation method. Background technique [0002] During the drilling process, when the oil and gas layers are opened, the first thing they come into contact with is the drilling and completion fluid. The solid phase particles in the liquid can easily invade into the natural pores near the well wall and cause reservoir pollution. With the flushing action, part of the immersed drilling fluid will be removed, but most of the drilling fluid will still remain in the pores, and the remaining drilling fluid will not only block the pores, but also pollute the reservoir, which will hinder the recovery of reservoir permeability , the production of the oil well will decrease. In recent years, many different plugging remov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/50
CPCC09K8/50
Inventor 蓝强姜春丽陈二丁夏晔王雪晨李蕾周晓蕾王俊徐运波郑成胜杨龙波经淑惠
Owner 中石化石油工程技术服务有限公司
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