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Method and device for evaluating dynamic sealing performance of gas storage trap by using stress field

A technology of dynamic sealing and gas storage, which is applied in earthwork drilling, special data processing applications, measurement, etc., can solve the problems of lack of dynamic sealing evaluation methods and systems for gas storage traps, and achieve clear evaluation results and low cost , strong applicability

Pending Publication Date: 2021-11-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to propose a method and device for evaluating the dynamic sealing performance of gas storage traps by using stress field, so as to solve the problem that the existing gas storage trap dynamic sealing performance is mainly aimed at the sealing ability of the cap rock, lacking systematic, Problems with a complete gas storage trap dynamic sealing evaluation method and system

Method used

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  • Method and device for evaluating dynamic sealing performance of gas storage trap by using stress field
  • Method and device for evaluating dynamic sealing performance of gas storage trap by using stress field
  • Method and device for evaluating dynamic sealing performance of gas storage trap by using stress field

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Embodiment 1

[0103] figure 1 A flow chart of a method for evaluating the dynamic tightness of a gas storage trap by using a stress field according to an embodiment of the present invention is shown. figure 2 It shows a model diagram of the spatial distribution of in-situ stress in a method for evaluating the dynamic tightness of a gas storage trap by using a stress field according to an embodiment of the present invention. image 3 A schematic diagram showing the stability of faults in a working area under the current geostress of a method for evaluating the dynamic tightness of gas storage traps by using stress field according to an embodiment of the present invention. Figure 4 It shows a stability diagram of faults predicted under the highest pore pressure in a working area according to a method for evaluating the dynamic tightness of gas storage traps using stress field according to an embodiment of the present invention. Figure 5 A schematic diagram showing the distribution of pore...

Embodiment 2

[0131] Figure 7 A block diagram of a device for evaluating the dynamic tightness of a gas storage trap by using a stress field according to an embodiment of the present invention is shown.

[0132] Such as Figure 7 As shown, the device for evaluating the dynamic sealing of gas storage traps using stress field includes:

[0133] The first obtaining module 102, obtains single well ground stress parameter;

[0134] The second acquisition module 104, based on the three-dimensional geological model and the stress parameters of the single well, obtains the spatial distribution characteristics of the stress;

[0135] Judgment module 106, based on the spatial distribution characteristics of the in-situ stress, judges the stability of the fault;

[0136] Calculation module 108, if the fault is stable, calculate the maximum pore pressure;

[0137] The evaluation module 110, based on the maximum pore pressure, evaluates the stress risk of the dynamic sealing performance of the gas ...

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Abstract

The invention discloses a method and a device for evaluating the dynamic sealing performance of a gas storage trap by using a stress field. The method comprises the following steps: acquiring a single well ground stress parameter; based on the three-dimensional geologic model and the single well crustal stress parameters, obtaining crustal stress space distribution characteristics; judging the stability of the fault based on the spatial distribution characteristics of the ground stress; if the fault is stable, calculating the maximum pore pressure; and evaluating the stress risk of the dynamic sealing performance of the gas storage fault based on the maximum gap pressure. By establishing a three-dimensional crustal stress field model, the three-dimensional crustal stress field model is analyzed, and crustal stress space distribution characteristics are obtained. Based on this, whether the fault is stable is determined, and calculation is carried out to obtain the maximum pore pressure. When the gas injection pressure of the gas storage is smaller than the maximum pore pressure, the stress risk of the sealing performance of the entrapment dynamic state is evaluated to be stable; and when the gas injection pressure is greater than the maximum pore pressure, the stress risk for evaluating the entrapment dynamic sealing performance is unstable, and the entrapment dynamic sealing of the gas storage is systematically and completely evaluated.

Description

technical field [0001] The invention belongs to the field of natural gas storage and transportation, and in particular relates to a method and a device for evaluating the dynamic sealing performance of a gas storage trap by using a stress field. Background technique [0002] At present, the evaluation of airtightness of gas storage traps is very important both at home and abroad. There are more and more airtightness evaluations before the construction of gas storages in terms of breadth and depth; whether in static airtightness evaluation or dynamic airtightness evaluation. There is a growing body of research on evaluation. Foreign underground gas storages are generally buried less than 2000m in depth, with simple structures, thick reservoirs, good physical properties, and good geological conditions, making them easy to build. The geological conditions of the construction targets of my country's underground gas storage are relatively poor, the buried depth is relatively lar...

Claims

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Application Information

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IPC IPC(8): G06F30/20E21B47/00E21B49/00G06F119/14G06F111/10
CPCG06F30/20E21B47/00E21B49/00G06F2119/14G06F2111/10
Inventor 曾大乾张广权胡向阳张俊法贾跃玮王丹丹
Owner CHINA PETROLEUM & CHEM CORP