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Plugging agent containing modified elastic framework material

An elastic skeleton and plugging agent technology, applied in the field of petroleum drilling materials, can solve problems such as poor compatibility between plugging particles and oil-based drilling fluid, circulation system entering the wellbore, and difficulty in dispersing, so as to avoid repeated leakage and good Plugging effect, good matching effect

Active Publication Date: 2022-03-29
中石化石油工程技术服务有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, there are few plugging agents for oil-based drilling fluid loss. Some of the plugging particles have poor compatibility with oil-based drilling fluid, float in oil-based drilling fluid, are not easy to disperse, and cannot enter the well through the circulation system. eye problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The addition amount of each component of a plugging agent containing a modified elastic skeleton material in 100 parts of oil-based drilling fluid is by weight percentage:

[0035] Modified sponge 0.1 part,

[0036] 2 parts micro-short fiber,

[0037] Quartz 3 parts,

[0038] 10 parts of superfine calcium carbonate,

[0039] 5 parts of rubber particles.

[0040] The preparation steps of modified sponge are:

[0041] Soak the sponge into polyethyleneimine BPEI, PAA, polyethyleneimine BPEI, and nano-montmorillonite solution in turn, each deposition time is 5 minutes, take it out, soak it in clean water, and then dry it with nitrogen. This is a deposition cycle, and the modified sponge is obtained after 200 deposition cycles.

Embodiment 2

[0043] The addition amount of each component of a plugging agent containing a modified elastic skeleton material in 100 parts of oil-based drilling fluid is by weight percentage:

[0044] Modified sponge 0.8 parts,

[0045] Ultra-short fiber 0.1 part,

[0046] Quartz 8 parts,

[0047] 5 parts of superfine calcium carbonate,

[0048] 10 parts of rubber particles.

[0049] The preparation steps of modified sponge are:

[0050] Immerse the sponge into polyethyleneimine BPEI, a mixture of PVA and boric acid, polyethyleneimine BPEI, and nano-montmorillonite solution in turn. The deposition time is 5 minutes each time. After taking it out, soak it in clean water, and then dry it with nitrogen. . This is a deposition cycle, and the modified sponge can be obtained after 150 deposition cycles.

Embodiment 3

[0052]The addition amount of each component of a plugging agent containing a modified elastic skeleton material in 100 parts of oil-based drilling fluid is by weight percentage:

[0053] Modified sponge 0.5 parts,

[0054] 1.5 parts of ultra-short fiber,

[0055] Quartz 5 parts,

[0056] 8 parts of superfine calcium carbonate,

[0057] 8 parts of rubber particles.

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Abstract

The invention relates to the field of petroleum drilling materials, in particular to a plugging agent for oil-based drilling fluid leakage. The material is mainly composed of modified sponge, ultra-short fibers, quartz, superfine calcium carbonate and rubber particles. The invention aims to obtain the plugging agent capable of improving the dispersity of plugging particles and the plugging success rate, the plugging agent is prepared from a modified framework material, the plugging agent is good in dispersity in oil-based drilling fluid, has good elasticity, has good matching property with cracks, is beneficial to deep formation of the cracks, can recover the shape after formation of the cracks, and can improve the plugging success rate. The plugging agent has the advantages that the plugging agent is convenient to use, bridging and net forming are facilitated, the plugging agent has a good plugging effect on various types of leakage, the plugging success rate can be well increased, repeated leakage is avoided, and the plugging agent has a good plugging effect on fracture-vug type leakage.

Description

technical field [0001] The invention relates to the field of petroleum drilling materials, in particular to a plugging agent for oil-based drilling fluid loss. Background technique [0002] Lost circulation is the phenomenon that various working fluids leak into the formation under the action of pressure difference during various downhole operations such as drilling, cementing and completion, testing or workover. Once lost circulation occurs, it will not only delay drilling time, lose drilling fluid, damage oil and gas layers, interfere with geological logging work, increase drilling costs, but also easily cause a series of complicated situations such as pipe sticking, blowout, and well collapse, and even lead to the scrapping of the wellbore. cause huge economic losses. [0003] With the further understanding of the causes of different lost circulation, the research and development of plugging materials is also making continuous progress. Since the 1960s, my country began...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/42
CPCC09K8/03C09K8/426C09K2208/08C09K2208/18
Inventor 刘振东李公让李卉于雷曹婧周晓蕾乔军夏晔明玉广
Owner 中石化石油工程技术服务有限公司
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