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A gas storage wellbore and cavity sealing method and device

A technology for sealing detection and gas storage, which is applied in the direction of using liquid/vacuum degree for liquid tightness measurement and measuring the acceleration and deceleration rate of fluid, etc., can solve problems such as lack of technology, improve detection efficiency and shorten detection time. , the effect of reducing the space filled with gas

Active Publication Date: 2020-09-01
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Abroad, since the 1980s, a lot of research has been carried out and a variety of results have been obtained. There are mainly two methods, one is the cavity seal detection method recommended by API, referred to as the API method; the other is the cavity seal recommended by Geostock The detection method, referred to as the Geostock method, the above method can only detect the airtightness of the wellbore of the gas storage (the part above the casing shoe of the gas storage), and there is still a lack of relevant technology in the detection of the airtightness of the cavity of the gas storage

Method used

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  • A gas storage wellbore and cavity sealing method and device
  • A gas storage wellbore and cavity sealing method and device
  • A gas storage wellbore and cavity sealing method and device

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Experimental program
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Embodiment 1

[0061] see figure 1 , in an embodiment of the present invention, a method for detecting the airtightness of a gas storage wellbore and cavity, comprising the following steps:

[0062] (1) A retractable air bag 4 is set in the cavity 5 of the gas storage, and the air bag 4 is communicated with the liquid outlet end of the infusion pipeline 7, and the infusion pipeline 7 stretches into the well shaft 9 of the gas storage (the sleeve of the gas storage) Pipe shoe 6 or more parts), such as figure 2 shown;

[0063] In this embodiment, the connection between the infusion pipeline 7 and the air bag 4 is located at the top of the chamber body 5 of the gas storage, so that after the air bag is fully filled, the shaft 9 of the gas storage will not be blocked, and the air bag fills the gas storage as much as possible. Cavity 5 spaces.

[0064] (2) Inject liquid 3 into the airbag 4 through the infusion pipeline 7, inject gas 19 into the annular space 8 between the wellbore 9 and the i...

Embodiment 2

[0100] Based on the same inventive concept, this embodiment provides a device for implementing the above gas storage wellbore and cavity airtightness detection method, see figure 1 , the device includes: air bag 4, infusion pipeline 7, liquid supply equipment 10, liquid supply pipeline 13, gas supply equipment 14, gas supply pipeline 15, air-water interface measurement equipment 18 and infusion wellhead 20, wherein:

[0101] The air bag 4 is installed at the outlet of the infusion pipeline 7, and is communicated with the infusion pipeline 7 by a connector. When testing, the air bag 4 is positioned in the cavity 5 of the gas storage, as figure 2 shown.

[0102] The infusion pipeline 7 communicates with the liquid supply equipment 10 through the liquid supply pipeline 13. When testing, the infusion pipeline 7 extends into the well shaft 9 of the gas storage, and the connection between the infusion pipeline 7 and the air bag 4 is located at the top of the cavity 5 ,Such as fi...

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Abstract

The invention discloses a gas storage wellbore and a cavity sealing property detection method and device. The sealing property of the wellbore and the cavity is detected by using the air bag installed in a gas storage cavity, and the sealing property of the wellbore and the cavity is jointly evaluated by the absolute value of the change of the depth of the gas-water interface and the change trend of the gas leakage rate with time. Compared with the method and the device in the prior art, the method can accurately judge the sealing property of the salt cave gas storage through the gas-water interface change value of the interface logging tool and the readings of the wellhead pressure gauges in the same test time. The method can not only detect the sealing property of the gas storage wellbore and can detect the sealing property of the whole gas storage cavity. The air bag installed inside the gas storage greatly reduces the space for filling gas so that the amount of gas required for detecting the sealing property of the wellbore and the cavity of the gas storage is particularly low, and thus the cost of the compressed air can be effectively reduced, the detection time can be shortened and the detection efficiency can be enhanced.

Description

technical field [0001] The application belongs to the technical field of petroleum and natural gas engineering, and in particular relates to a method and a device for detecting the airtightness of a wellbore and a cavity of a gas storage. Background technique [0002] The construction of salt cavern underground gas storage is a high-risk and complex project, which has high requirements on the airtightness of the wellbore and cavity of the gas storage, and its airtightness detection technology has become the key to evaluating the success of the construction of the gas storage project . Generally speaking, rock salt is a rock that is extremely difficult to penetrate when it is covered by formations, and its porosity is also very low. Influenced by many factors such as cementing quality. [0003] The salt beds of China’s salt-cavern gas storages have the characteristics of many ore layers, small single-layer thickness, many interlayers, low salt grade, many symbiotic componen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/32
CPCG01M3/32
Inventor 章雨豪马洪岭施锡林杨春和李银平王同涛韩月
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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