Plugging material and preparation method thereof

A technology of plugging materials and surfactants, which is applied in the field of drilling and completion engineering, can solve problems such as unadjustable curing time, and achieve the effect of satisfying reservoir protection requirements and satisfying leakage control.
CN112341998AInactive Publication Date: 2021-02-09CHENGDU UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHENGDU UNIVERSITY OF TECHNOLOGY
Publication Date
2021-02-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a plugging material and a preparation method thereof. The plugging material comprises the following components in percentage by mass: 0.1-0.5% of a surfactant, 3-10% of oil, 0.1-0.5% of a tackifier, 20-50% of a curing agent, 12-0% of a curing reaction aid, 5-50% of a structural strength aid, 1-25% of a filtrate reducer, 1-20% of a retarder and the balance of water. The surfactant comprises an oil-soluble surfactant and a water-soluble surfactant, and the retarder comprises a retarder I and a retarder II; the plugging material is of a water-in-oil-in-water type structure, an inner water-in-oil structure is composed of part of water, a first retarder, an oil-soluble surfactant and oil, and the water-in-oil structure and other components form an oil-in-water structure.The plugging material is adjustable in curing time, has good flow characteristics and thixotropy, does not depend on identification of the width of a leakage crack, has the advantages of high strength of a cured plugging belt, capability of being removed by acid dissolution and no damage to a reservoir, can be used for leakage control of a non-reservoir section and leakage control of a reservoirsection, and is wide in application range.
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Description

technical field

[0001] The invention relates to the technical field of drilling and completion engineering in oil and gas exploration and development operations, in particular to a plugging material and a preparation method thereof. Background technique

[0002] Lost circulation is one of the common downhole complex situations in the drilling and completion process, which usually brings severe challenges to drilling and completion engineering. For example, lost circulation will lead to a large loss of drilling fluid, prolonged drilling cycle, poor wellbore cleaning and even pipe sticking . Therefore, lost circulation will lead to a substantial increase in drilling costs and pose a huge challenge to safe and efficient drilling and completion.

[0003] Loss control is usually achieved by technologies such as plugging materials, underbalanced drilling, and managed pressure drilling, among which plugging materials are the most widely used technology in the field, mainly includi...

Claims

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