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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.

Inactive Publication Date: 2021-02-09
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the gel plugging technology and the cement slurry plugging technology can realize plugging without relying on the identification of the width of downhole fractures. These two techniques cannot be applied in the reservoir section
On the other hand, the existing leakage plugging materials also have the disadvantage that the curing time cannot be adjusted

Method used

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  • Plugging material and preparation method thereof
  • Plugging material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A plugging material, which is composed of the following components in mass percentage: 0.12% of Span 80, 0.12% of Pingpinga O-20, 4% of diesel oil, 0.16% of polyvinyl alcohol, 20% of calcium chloride, 4% sodium bicarbonate, 28% dolomite powder, 1.6% starch, 4% sodium phosphate, 38% water.

[0038]The plugging material is prepared by the following steps: add part of water to the slurry mixing container, turn on the agitator, then add part of sodium phosphate, and at the same time, dissolve Span 80 in diesel oil and add it to the water phase, and stir evenly Obtain the water-in-oil type inner layer retarder; Add remaining water, flatly add O-20, remaining sodium phosphate, starch, sodium bicarbonate in the described water-in-oil type inner layer retarder, wait for it to stir about After fully dissolving in 2 minutes, add polyvinyl alcohol, stir for about 30 minutes, until the polyvinyl alcohol is completely dissolved, add calcium chloride and dolomite mineral powder to th...

Embodiment 2

[0040] A plugging material, which is composed of the following components in mass percentage: 0.12% of Span 80, 0.12% of polyoxyethylene ether, 4% of kerosene, 0.16% of polyvinyl alcohol, 20% of calcium chloride, 4% % sodium bicarbonate, 28% dolomite powder, 1.6% starch, 4% sodium phosphate, 38% water.

[0041] The plugging material is prepared by the following steps: add part of water to the slurry mixing container, turn on the agitator, then add part of sodium phosphate, at the same time, dissolve Span 80 in kerosene and add it to the water phase, and stir evenly Obtain the water-in-oil type inner layer retarder; Add remaining water, polyoxyethylene ether, remaining sodium phosphate, starch, sodium bicarbonate to the described water-in-oil type inner layer retarder, and wait for it to stir for about 2 Add polyvinyl alcohol after fully dissolving in 1 minute, stir for about 30 minutes, until the polyvinyl alcohol is completely dissolved, add calcium chloride and dolomite mine...

Embodiment 3

[0043] A plugging material, which is composed of the following components in mass percentage: 0.11% Span 80, 0.11% Pingpinga O-20, 3.7% diesel oil, 0.15% polyvinyl alcohol, 18.52% calcium chloride, 3.7% Sodium bicarbonate, 29.63% dolomite mineral powder, 1.48% starch, 7.41% sodium phosphate, 35.19% clear water.

[0044] The plugging material is prepared by the following steps: add part of water to the slurry mixing container, turn on the agitator, then add part of sodium phosphate, and at the same time, dissolve Span 80 in diesel oil and add it to the water phase, and stir evenly Obtain the water-in-oil type inner layer retarder; Add remaining water, flatly add O-20, remaining sodium phosphate, starch, sodium bicarbonate in the described water-in-oil type inner layer retarder, wait for it to stir about After fully dissolving in 3 minutes, add polyvinyl alcohol, stir for about 30 minutes, until the polyvinyl alcohol is completely dissolved, add calcium chloride and dolomite min...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
CPCC09K8/426
Inventor 张浩佘继平杨洋
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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