Biodegradable water-swelling plugging agent and preparation method thereof

A water-absorbing swelling and biodegradation technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of no swelling, poor compression and swelling performance, and difficult pumping, etc., to achieve good swelling ability and anti-swelling ability High pressure capacity, good pressure resistance performance, and the effect of improving drilling efficiency

Pending Publication Date: 2020-05-08
潍坊华潍新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used plugging technology at home and abroad is mainly the bridge plugging technology, but this type of plugging technology mainly has the following defects: 1. The fracture opening of the formation is often not accurately grasped. 1. When the concentration depends more on field experience, it is often prone to repeated leakage, resulting in huge losses of manpower, material resources and financial resources; Stable plugging; Third, the plugging material has poor deformability and is easy to plug on the fracture surface, and cannot penetrate deep into the formation to plug
[0004] At present, the most widely used water-absorbing polymer is polyacrylamide, but its water-absorbing speed is too fast, and when it is used for plugging operations, it is easy to cause pumping difficulties and affect the performance of drilling fluids. Unable to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The biodegradable water-swelling plugging agent is made of the following raw materials in parts by weight: 50 parts of acrylic acid; 10 parts of acrylamide; 10 parts of 2-acrylamide-2-methylpropanesulfonic acid; 0.21 parts of potassium persulfate; 36 parts of sodium hydroxide; 0.21 parts of sodium bisulfite; 0.2 parts of cross-linking agent; 5 parts of Enteromorpha powder; 30 parts of bentonite; 100 parts of water; 8 parts of walnut shell; 5 parts of mica.

[0035] The lost circulation agent prepared in Example 1 was tested, and the experimental result was phenotype. Its water absorption multiple was 95g / g, and it performed well in water-based drilling fluid. Through the experiment of the QD-2 type lost circulation material experimental device, 0.8- 1.2% of the plugging agent has a pressure bearing capacity of 3.5Mpa for 1-2mm cracked plates, and 2-2.5% of the plugging agent has a pressure bearing capacity of 3.0Mpa for 2-4mm cracked plates, and the fluid loss during the...

Embodiment 2

[0037] The biodegradable water-swelling plugging agent is made of the following raw materials in parts by weight: 65 parts of acrylic acid; 15 parts of acrylamide; 0.25 parts of potassium persulfate; 41 parts of sodium hydroxide; 0.25 parts of sodium bisulfite; 0.23 parts; Enteromorpha powder 10 parts; Bentonite 40 parts; Water 120 parts; Walnut shell 10 parts.

[0038] The lost circulation agent prepared in Example 2 was tested, and the experimental result was phenotype. Its water absorption multiple was 120g / g, and it performed well in water-based drilling fluid. Through the experiment of the QD-2 type lost circulation material experimental device, 0.8- 1.5% of the plugging agent has a pressure bearing capacity of 3.0Mpa for 1-2mm cracked plates, and 2-3% of the plugging agent has a pressure bearing capacity of 3.5Mpa for 2-4mm cracked plates, and the fluid loss during the plugging process is very small. The cracks are densely cemented and can quickly seal the cracks.

Embodiment 3

[0040] The biodegradable water-swelling plugging agent is made of the following raw materials in parts by weight: 65 parts of acrylic acid; 15 parts of 2-acrylamido-2-methylpropanesulfonic acid; 0.25 parts of potassium persulfate; 45 parts of sodium hydroxide 0.25 parts of thiourea; 0.23 parts of cross-linking agent; 10 parts of Enteromorpha powder; 40 parts of bentonite; 120 parts of water; 10 parts of mica.

[0041]The lost circulation agent prepared in Example 3 was tested, and the experimental result was phenotype. Its water absorption multiple was 115g / g, and it performed well in water-based drilling fluid. Through the experiment of the QD-2 type lost circulation material experimental device, 0.8- 1.5% of the plugging agent has a pressure bearing capacity of 3.5Mpa for 1-2mm cracked plates, and 2-3% of the plugging agent has a pressure bearing capacity of 3.5Mpa for 2-4mm cracked plates. The fluid loss during the plugging process is very small. The cracks are densely ceme...

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PUM

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Abstract

The invention discloses a biodegradable water-swelling plugging agent and a preparation method thereof. The biodegradable water-swelling plugging agent is prepared from the following raw materials inparts by weight: 30-80 parts of acrylic acid, 0 to 40 parts of acrylamide, 0 to 20 parts of 2-acrylamide-2-methyl propanesulfonic acid, 0.1 to 0.35 part of an initiator, 30 to 65 parts of a neutralizer, 0.1 to 0.35 part of a reducing agent, 0.2 to 0.5 part of a cross-linking agent, 3-10 parts of enteromorpha prolifera powder, 30 to 50 parts of bentonite, 50 to 120 parts of water, 0 to 20 parts ofnut shells, 0-10 parts of mica and 0-10 parts of vermiculite. The prepared water-swelling plugging agent is stable in structure, high in strength and good in viscoelasticity, still has good expansioncapacity and anti-pressure capacity in a high-temperature and high-pressure environment at the bottom of a well, is good in plugging effect, can be completely biodegraded in a soil environment, and isfriendly to the environment.

Description

technical field [0001] The invention belongs to the technical field of geological drilling and oil drilling plugging operations, and in particular relates to a biodegradable water-absorbing swelling plugging agent and a preparation method thereof. Background technique [0002] Lost circulation is a downhole complex situation in which the working fluid leaks into the formation in drilling engineering, and it is one of the most common and frequently encountered complex problems in drilling operations. Because the downhole complex situation caused by lost circulation is very harmful to the drilling and completion construction, the lost circulation has always been a matter of great concern to the petroleum engineering circles at home and abroad. In the drilling operation, once leakage occurs, not only the drilling time will be delayed, the drilling fluid will be lost, the oil and gas layers will be damaged, and the normal progress of the geological logging work will be affected,...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F220/06C08F220/56C08F220/58C08F222/38C08F2/44C08K3/34C09K8/44C09K8/42
CPCC08F292/00C08F2/44C08K3/34C08K3/346C09K8/44C09K8/426
Inventor 王晓凯韩洪海
Owner 潍坊华潍新材料科技有限公司
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