Pressure test method for detecting seal performance of gas storage cavity of salt cavern

A gas storage and airtightness technology, which is applied in the liquid tightness measurement using liquid/vacuum degree, by measuring the increase and deceleration rate of the fluid, construction, etc., can solve the problem of long test time, poor field operability, and indeterminate leakage Position and other issues, to achieve the effect of scientific and accurate evaluation method, strong on-site operability, and reduced pressure test cost

Active Publication Date: 2009-07-15
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

The disadvantages of this method are: a large amount of gas injection, special interface measuring instruments are required, the test result is a periodic single value, and the evaluation result is inaccurate
The disadvantages of this method mainly include three aspects: (1) two sets of pressure test strings are required, and the test time is long, so the cost is high; (2) the performance of the wellhead instrument is high and the operability on site is poor; (3) if leakage occurs , this method cannot determine the specific leak location
[0005] In summary, it can be seen that API and Geostock gas storage cavity seal detection methods are difficult to meet the domestic demand for gas storage cavity pressure testing in terms of evaluation of pressure test results and on-site operability.

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  • Pressure test method for detecting seal performance of gas storage cavity of salt cavern
  • Pressure test method for detecting seal performance of gas storage cavity of salt cavern
  • Pressure test method for detecting seal performance of gas storage cavity of salt cavern

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Embodiment Construction

[0027] This method has been successfully tried for the first time in the pressure test process of the salt cavern cavity of West 2 Well and West 1 Well in Jintan area, which belongs to our company, from December 12th to 15th, 2004. The whole pressure test process was very smooth. The pressure test results show that within 24 hours, the maximum variation of the gas-water contact depth at the production casing shoes of Wells Xi 1 and Well Xi 2 is 0.118m, and the cavity leakage rate of Wells Xi 1 and Well Xi 2 gradually decreases over time. Small, and finally stabilized at around 0 value, so the cavities of the salt cavern gas storage in Wells Xi 1 and Well Xi 2 are well sealed, and the next stage of gas injection and brine discharge can be carried out. The successful pressure tests of Wells Xi 2 and Well Xi 1 were highly recognized by peer experts, and the pressure test methods were unanimously praised by experts. This method was successfully applied in the pressure test of Well...

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Abstract

Disclosed is a method for testing the cavity mechanical completeness integrity of the salt cavity air library. The method comprises steps of: laying down a suite of pressure testing pipe column, employing nitrogen or air as pressure testing media to test pressure in the salt cavity; measuring the variation value of the air-water interface depth during testing time, obtaining the readings of each well head meters in the testing time via ground detecting meter, and calculating the variation trend of the cavity leakage rate versus time; combining the variation of cavity air-water interface depth and the variation trend of the air leakage rate versus time to evaluate the cavity's mechanical completeness integrity.

Description

technical field [0001] The invention relates to a method for detecting the mechanical integrity of the cavity of an underground salt cavern gas storage, that is, a pressure test detection method for detecting the sealing performance of the cavity of the salt cavern gas storage. The method of injecting saturated brine and nitrogen into the well is used to complete the pressure test, which provides an effective operational basis for testing the tightness of the casing wellbore and cavity, and provides technical support for ensuring the safe operation of the gas storage in the future. The invention belongs to the technical field of petroleum and natural gas engineering. Background technique [0002] At present, the underground salt cavern gas storage is still blank in China, and the technical research in this field is also in its infancy. The cavity seal detection technology of salt cavern gas storage is unprecedented in China, and there is no unified method and detection stan...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/26G01M3/32
CPCE21B47/1025E21B47/117
Inventor 田中兰袁光杰申瑞臣袁进平何爱国路立君蓝海峰齐奉中
Owner BC P INC CHINA NAT PETROLEUM CORP
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