Sealing performance test method and system for salt cavern gas storage
A test method and gas storage technology, applied in fluid tightness testing, liquid tightness measurement using liquid/vacuum degree, machine/structural component testing, etc., can solve the problem of salt cavern gas storage that does not provide calculation process Problems such as airtightness test software and lack of airtightness test method and system for salt cavern gas storage have achieved the effect of convenient calculation, low requirements for technical personnel, and convenient operation
Active Publication Date: 2019-02-05
CHINA TIANCHEN ENG
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Problems solved by technology
At present, the airtightness test of salt cavern gas storage based on gas mass balance is widely used in the world and has high reliability. Consulting companies with relatively mature technologies mainly include GEOSTOCK and DEEP, and these companies only provide final calculations. As a result, the relevant calculation process and salt-cavern gas storage leak test software are not provided, so there is currently a lack of mature salt-cavern gas storage leak test methods and systems in China
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[0054] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0055] combine figure 1 , the concrete method that the present invention proposes and system function are as follows:
[0056] (1) According to the wellhead pressure and logging temperature, the compression factor of adjacent intervals can be obtained,
[0057] Its calculation formula is as follows:
[0058]
[0059] ρ m =P WH / (ZRT)
[0060] In the formula:
[0061] Z is nitrogen compression factor, dimensionless, ρ mis the molar density of nitrogen, in kmol m -3 , B and C are the Vili coefficients, dimensionless; P WH is the wellhead pressure in bar, R is the gas constant in J / (mol*K), T is the nitrogen temperature in the adjacent interval, in K;
[0062] Based on this recursion, the compression factor of nitrogen in any interval in the well can be obtained;
[0063] (2) According to the wellh...
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The invention discloses a sealing performance test method and system for a salt cavern gas storage. Nitrogen gas is taken as a test medium; the depth, temperature and pressure of a gas-water interfaceat different time are measured through a logging tool; the nitrogen quality at different time is calculated out according to data; the well internal leakage amount is judged according to the change of the nitrogen quality; and whether the gas storage meets the airtightness requirement or not is obtained. According to the test method and system, the calculation of sealing performance tests such asa mechanical integrity test of a salt cavern, an airtightness test, a cavity receiving test and the like can be accurately and conveniently completed; and the test method and system is easily appliedto the engineering projects.
Description
technical field [0001] The invention belongs to the field of oil and gas resource development, and in particular relates to a method and a test system for testing the tightness of a salt cavern gas storage. Background technique [0002] At present, domestic underground natural gas storage is in the initial stage of development, and the technical research in this field is still immature. In terms of gas storage construction, many technologies need to rely on foreign consulting technology companies to provide support. In terms of sealing test of salt cavern gas storage, there is no relatively mature standard specification in China at present. [0003] The underground natural gas storage market is relatively small, and there is currently no mature method for tightness testing. At present, the airtightness test of salt cavern gas storage based on gas mass balance is widely used in the world and has high reliability. Consulting companies with relatively mature technologies main...
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Login to View More IPC IPC(8): G01M3/32
CPCG01M3/3236
Inventor 孙昌路孙威孟晓军彭良海孙顺平侯振
Owner CHINA TIANCHEN ENG