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Self-cleaning or self-degrading temporary plugging agent and preparation method thereof

A self-degrading and self-cleaning technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as non-self-degradation, and achieve the effects of rapid preparation, low procurement cost and saving preparation time.

Pending Publication Date: 2021-03-26
西安石油大油气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a self-cleaning or self-degrading temporary plugging agent to solve the problem that the prior art cannot degrade by itself

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A self-cleaning or self-deteriorating agent, with the total weight of the self-cleaning or self-deteriorating suspended agent, preparing the raw material of the self-cleaning or self-deteriorating agent, including the weight percentage The following components:

[0032] Polylactic acid, from 40% to 50%;

[0033] Biological degradation agents, from 25% to 35%;

[0034] The biodegradant is a mixture of soybeans and corn, and the weight ratio of soy and corn is 2: 1, and the particulate diameter of the biodexidant is 0.3 to 0.8 mm.

[0035] Glycerin, the amount is 2% -4%;

[0036] Polycaprolactone, usage of 4% to 6%;

[0037] The thickener is 5% -7%;

[0038] The thickener uses one of sodium bromide, sodium chloride, potassium chloride, and cesium formate.

[0039] Alkaline solution, amount is from 1% to 3%;

[0040] The alkaline solution is selected from one of the sodium carbonate solution and sodium hydroxide solution, and the basic chemical component of the alkaline soluti...

Embodiment 2

[0053] A self-cleaning or self-deteriorating agent, with the total weight of the self-cleaning or self-deteriorating suspended agent, preparing the raw material of the self-cleaning or self-deteriorating agent, including the weight percentage The following components:

[0054] Polylactic acid, from 45% to 50%;

[0055] Biological degradation agents, from 30% to 35%;

[0056] The biodegradant is a mixture of soybeans and corn, and the weight ratio of soybeans and corn is 2: 1, and the particulate diameter of the biodexidant is 0.4-0.8 mm.

[0057] Glycerin, the amount of amount is 3% -4%;

[0058] Polycaprolactone, amount of 5% to 6%;

[0059] The thickener is 6% -7%;

[0060] The thickener uses one of sodium bromide, sodium chloride, potassium chloride, and cesium formate.

[0061] Alkaline solution, amount is 2% -3%;

[0062] The alkaline solution is selected from one of the sodium carbonate solution and sodium hydroxide solution, and the basic chemical component of the alkaline ...

Embodiment 3

[0075] A self-cleaning or self-deteriorating agent, with the total weight of the self-cleaning or self-deteriorating suspended agent, preparing the raw material of the self-cleaning or self-deteriorating agent, including the weight percentage The following components:

[0076] Polylactic acid, from 40% to 50%;

[0077] Biological degradation agents, from 30% to 35%;

[0078] The biodegradant is a mixture of soybeans and corn, and the weight ratio of soybeans and corn is 2.5: 1, and the particulate diameter of the biodexidant is 0.3 to 0.8 mm.

[0079] Glycerin, the amount is 2.5% -4%;

[0080] Polycaprolactone, from 4.5% to 6%;

[0081] The thickener is 5.5% -7%;

[0082] The thickener uses one of sodium bromide, potassium chloride and cesium formate.

[0083] Alkaline solution with 1.5% to 3%;

[0084] The alkaline solution is selected from one of the sodium carbonate solution and sodium hydroxide solution, and the basic chemical component of the alkaline solution is 10%-20%, and...

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Abstract

The invention discloses a self-cleaning or self-degrading temporary plugging agent and a preparation method thereof. The self-cleaning or self-degrading temporary plugging agent is prepared from the following raw materials by weight: 40%-50% of polylactic acid, 25%-35% of a biodegradation agent, 2%-4% of glycerol, 4%-6% of polycaprolactone, 5%-7% of a thickening agent, 1%-3% of an alkaline solution and 0.1%-0.5% of a cross-linking agent, with the balance being water. According to the self-cleaning or self-degrading temporary plugging agent and the preparation method thereof, the temporary plugging agent can be degraded within 48 h, can absorb water to expand and crack at a formation temperature so as to realize loss of mechanical strength, and is finally degraded into water and carbon dioxide along with time increase; and the temporary plugging agent can be automatically degraded under a reservoir temperature condition, and can be automatically degraded after operation for high-water-content oil wells and water wells.

Description

Technical field [0001] The invention belongs to the field of oilfield chemical technology, in particular a self-cleaning or self-deteriorating dismissal agent and a preparation method thereof. Background technique [0002] At present, the use of extensive sewers can be classified from the interpolation, which can be divided into water-soluble temporary plug, oil-soluble suspected agent, acid-soluble tubing, and the oil-soluble temporary blocker can be degraded by crude oil due to the operation. It is widely used. However, with the development of oilfield, most of my country's land oil field has gradually increased, and the average oil well water content is more than 70%, and some oil wells have more than 90%, and the oil-soluble temporary agent degradation rate obviously decased. In addition, the pressure is unbalanced between the layers of injection wells. During the operation of repairing, matting, sand sand, the flow of the in-well fluid is serious, and there are many wells th...

Claims

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Application Information

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IPC IPC(8): C09K8/504C09K8/508C09K8/512
CPCC09K8/504C09K8/512C09K8/5086
Inventor 张相春邢艳斌赵晨张国华邢志辉邓鹏张鑫席海浪李昂
Owner 西安石油大油气科技有限公司
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