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Transformation method for carbonate reservoir

A carbonate reservoir and reservoir technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve problems such as unsatisfactory oil and gas production, and achieve improved connection efficiency, increased efficiency, and reduced energy consumption. cost effect

Inactive Publication Date: 2020-11-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
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Problems solved by technology

resulting in unsatisfactory oil and gas production

Method used

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Embodiment Construction

[0016] The invention relates to a modification method for carbonate reservoirs.

[0017] In this reconstruction method, it is necessary to inject thickened acid into the communication channels in the reservoir multiple times to chemically react with the rocks of the reservoir to form acid erosion channels, and between adjacent injections of thickened acid to the reservoir Inject temporary plugging liquid to block the acid etching channel formed by the previous injection of thickened acid.

[0018] Therefore, this method injects thickened acid into the reservoir multiple times to form acid-etched channels, and pumps temporary plugging liquid into the formation during the adjacent injection of thickened acid so that the acid-etched channels formed last time are blocked. Temporary plugging, the subsequent injection of thickened acid will not repeatedly acid-etch the blocked acid-etched channels, but enter the remaining unreacted reservoir areas for acid-rock reaction, thus realiz...

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Abstract

The invention provides a transformation method for a carbonate reservoir. The transformation method comprises the following steps of injecting thickening acid into a communication channel in the reservoir for multiple times so as to generate chemical reaction with rocks of the reservoir to form an acid etching channel; and injecting the temporary plugging liquid into the reservoir between the adjacent times of injection of the thickening acid to plug the acid etching channel formed by the last time of injection of the thickening acid. The method can realize the transformation of different reservoir areas, and is beneficial to improving the oil and gas exploitation.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development reservoir transformation, in particular to a transformation method for carbonate reservoirs. Background technique [0002] Acid fracturing is one of the main measures for increasing production and injection in low-permeability oil and gas fields at home and abroad. However, due to the strong heterogeneity of the reservoirs, especially the carbonate reservoirs, conventional acidizing and fracturing processes are limited in scope. Also, with the prolongation of production time, the artificial cracks formed in the early stage gradually closed or flooded. As a result, oil and gas production is not ideal. [0003] Therefore, there is a need to develop a stimulation method for carbonate reservoirs to increase oil and gas production. Contents of the invention [0004] Aiming at part or all of the above-mentioned technical problems existing in the prior art, the present inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27E21B33/13C09K8/74C09K8/514
CPCE21B43/26E21B33/13C09K8/74C09K8/514
Inventor 贺甲元宋丽阳张汝生张雄耿宇迪罗攀登黄志文张俊江方裕燕房好青
Owner CHINA PETROLEUM & CHEM CORP
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