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Composite alternative acid dissolving method of hyposmosis oil layer

A low-permeability, oil-bearing technology, used in earth-moving drilling, fluid production, wellbore/well components, etc., can solve problems such as poor compatibility, and achieve the effect of improving oil production capacity

Active Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compatibility of new acid fluids and additives with low-permeability clastic rocks is even worse, requiring repeated optimization and screening in laboratories

Method used

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  • Composite alternative acid dissolving method of hyposmosis oil layer
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  • Composite alternative acid dissolving method of hyposmosis oil layer

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Embodiment Construction

[0027] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0028] Such as figure 1 as shown, figure 1 It is a flow chart of the low-permeability oil layer composite alternate acid solution method of the present invention. In step 101, targeted sampling is carried out, and a section of the reservoir for acidification and stimulation is selected. The principles of layer selection mainly include two aspects: first, the target interval has relatively good oil content, and the oil content level should be above the oil spot level. In one embodiment, oil immersion and oil spots were found in the 2918.1m-2922.0m section of the well in geological logging, borehole wall coring, and drilling coring; secondly, the distance between the target interval and the upper and lower aquifers is relatively large, In one em...

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Abstract

The invention relates to a composite alternative acid dissolving method of a hyposmosis oil layer. The composite alternative acid dissolving method of the hyposmosis oil layer comprises the following steps of: selecting an acidifying modified storage layer section; carrying out storage layer microanalysis on the acidifying modified storage layer section; carrying out corrosion inhibition acid diving supply on the acidifying modified storage layer section; and carrying out main body acid karst chambering on the acidifying modified storage layer section. According to the composite alternative acid dissolving method of the hyposmosis oil layer, the problem that the success rate of the conventional acidifying method is low is solved and the composite alternative acid dissolving method has the advantages of effectively evaluating a hyposmosis storage layer and improving a hyposmosis oil layer oil production capability.

Description

technical field [0001] The invention relates to an oil testing process and a mining process of a low-permeability clastic rock oil layer, in particular to a composite alternate acid-dissolving method for a low-permeability oil layer. Background technique [0002] Due to the high seepage resistance in low-permeability oil layers, the energy consumption in the process of fluid migration is high, the formation pressure and flow pressure are low, and the production capacity is poor. At present, the fracturing process is mostly used for oil testing, and high production is obtained in the initial stage, but the production declines rapidly and the stable production capacity is poor. With the deepening understanding of formation characteristics and damage causes of low-permeability reservoirs, more and more new acid solutions, additives and acidizing processes have emerged and been applied, but the field success rate is still not ideal. The unclear understanding of the origin of cl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27
Inventor 王永诗张守鹏滕建彬赵铭海谢忠怀王伟庆李保利刘华夏田方
Owner CHINA PETROLEUM & CHEM CORP
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