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Temporary plugging steering acidification method applicable to sandstone reservoir

A technology for sandstone reservoirs and acid fluids, applied in chemical instruments and methods, earthwork drilling, and drilling compositions, etc., can solve the problems of uneven acidification, low calcium and magnesium ion content, etc., and achieve strong dehydration condensation reaction ability, excellent gel-forming performance, and the effect of improving heterogeneity

Active Publication Date: 2017-02-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for sandstone reservoirs, the content of calcium and magnesium ions in the reservoir is relatively small, and self-steering acid technology cannot make it evenly acidified

Method used

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  • Temporary plugging steering acidification method applicable to sandstone reservoir
  • Temporary plugging steering acidification method applicable to sandstone reservoir
  • Temporary plugging steering acidification method applicable to sandstone reservoir

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Embodiment Construction

[0021] The present invention will be specifically described below in conjunction with examples, but not limited thereto.

[0022] 1. Raw material preparation:

[0023] The oil-producing layer of well X in a certain oilfield is a heterogeneous sandstone reservoir, and the acidizing method of the present invention is used to acidify and remove plugging.

[0024] Determined according to reservoir conditions and acidizing requirements:

[0025] 1. The pre-acid formula is 10% HCl, 2% HAC, 2% additives, 3% sand stabilizer, 4% diverting agent, and the rest is water. The above percentages are the percentages of each raw material in the total mass of the pre-acid.

[0026] 2. The synergist formula is 0.4% hydroxypropyl guar gum, 0.1% fungicide, 1% potassium chloride, 0.2% drainage aid, 1% water-soluble phenolic resin, 0.08% gel breaker, and the rest is water, the above Each percentage is the percentage of each raw material in the total mass of the synergistic solution.

[0027] Wher...

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Abstract

The invention relates to a temporary plugging steering acidification method applicable to a sandstone reservoir, which belongs to the technical field of yield increasing and injection increasing of oil and gas fields. By adopting pad-acid and synergistic liquid, the temporary plugging of a high permeable layer of the non-homogenous sandstone reservoir can be realized, and the temporary plugging performance is good, so that the subsequently injected main body acid liquid can be successfully diverted to enter a low permeable layer and to acidify the low permeable layer. By adopting the acidification method, the sandstone reservoir can be effectively and homogenously acidified, and the non-homogeneity of the reservoir can be improved.

Description

technical field [0001] The invention belongs to the technical field of increasing production and injection in oil and gas fields. Background technique [0002] Acidizing can effectively remove the pollution and clogging of oil and gas layers near the wellbore, improve the connectivity between the wellbore and the reservoir near the wellbore, and is one of the common methods to increase the productivity of oil and gas wells. For reservoirs with strong heterogeneity, acid diversion technology is usually used to achieve uniform acidification of the reservoir. [0003] Self-steering acid technology, as a commonly used acid liquid diversion technology, is suitable for carbonate reservoirs, because there are a lot of calcium and magnesium ions in carbonate reservoirs, which can make the large pores (or high permeability layers) Uniform acidification is achieved by self-diverting acid viscosity increasing and subsequent acid diversion into the low-permeability zone. However, for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27C09K8/512C09K8/506C09K8/72
CPCC09K8/506C09K8/5086C09K8/512C09K8/72C09K2208/26E21B43/26
Inventor 李景辉朱苏青齐宁李凡磊李兴潘义
Owner CHINA PETROLEUM & CHEM CORP
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