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Dynamic sealing performance evaluation method for oil reservoir type gas storage cover layer

A technology of dynamic sealing and evaluation method, which is applied in the direction of using liquid/vacuum degree for liquid tightness measurement and applying stable tension/pressure to test material strength, etc. Problems such as the inability to accurately evaluate the dynamic sealing performance of the reservoir-type gas storage caprock

Active Publication Date: 2021-05-07
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that cyclic injection and production will cause periodic disturbances in the regional geostress field, resulting in changes in the mechanical properties of the caprock, thereby changing the sealability of the caprock, and the prior art cannot accurately evaluate reservoir-type gas storage Dynamic tightness of reservoir cover

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  • Dynamic sealing performance evaluation method for oil reservoir type gas storage cover layer
  • Dynamic sealing performance evaluation method for oil reservoir type gas storage cover layer
  • Dynamic sealing performance evaluation method for oil reservoir type gas storage cover layer

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Embodiment Construction

[0094] In order to make the purpose, technical solutions and advantages of the embodiments of the invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0095] Such as figure 1 As shown, the present invention provides a method for evaluating the dynamic tightness of the cap rock of an oil reservoir type gas storage, comprising the following steps:

[0096] S1. Prepare core samples:

[0097] According to the test standard in Part 18 of the "Physical and Mechanical Properties of Rock of the Ministry of Geology and Mineral Resources of the People's Republic of ...

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Abstract

The invention provides a dynamic sealing performance evaluation method for an oil reservoir type gas storage cover layer. The method comprises the following steps of: S1, preparing a rock core sample; S2, loading the sample into an experimental device; S3, recording a change value of gas pressure attenuation along with time; S4, calculating the diffusion coefficient of the rock sample; S5, calculating the permeability of the rock sample; S6, recording the change data of the pressure difference along with time under cyclic loading and unloading; and S7, establishing a permeability and diffusion coefficient and period model under multi-period operation. According to the method, the technical blank of dynamic sealing performance evaluation of the oil reservoir type gas storage cover layer at present is filled, the establishment process conforms to the actual operation process of the oil reservoir type gas storage, and the dynamic sealing performance of the oil reservoir type gas storage cover layer can be accurately evaluated.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas, in particular to a method for evaluating the dynamic sealing performance of the cap rock of an oil reservoir type gas storage during multi-period injection-production operation. Background technique [0002] The dynamic sealing evaluation of cap rock is an important basis for the construction of underground gas storage. For underground gas storage, cyclic injection and withdrawal will cause periodic disturbances in the regional in-situ stress field, resulting in changes in the mechanical properties of the cap rock, thereby changing the cap rock. Layer tightness. Therefore, the study of the mechanical stability of the caprock under alternating stress is the core content of the dynamic sealing evaluation of the caprock of the underground gas storage. [0003] At present, the construction of gas storage is divided into: depleted oil, gas storage gas storage, aquifer gas storage, salt cavern...

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Application Information

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IPC IPC(8): G01M3/02G01N3/08
CPCG01M3/02G01N3/08
Inventor 敖翔刘哲知吕雪莹朱诗杰胥洪成肖前华向祖平陈中华李志军张翰文程泽华
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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