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A rapid construction of salt cavern storage technology for asymmetrical brine mining with double wells

An asymmetric and technological technology, which is applied in the field of rapid construction of salt cavern storage by asymmetric brine mining in double wells, can solve the problems of complex process, limited cavity building speed, and small distance between two wells, and achieve simplified cavity building process, The effect of increasing the cavity-building speed and reducing the cavity-building cost

Active Publication Date: 2018-11-20
江苏苏盐井神股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, the conventional single well oil cushion method has problems such as complex process, small flow rate, low brine concentration, long cavity building time and high cavity cost.
Relevant patents have also proposed the construction method of double wells of the gas storage and the construction method of the horizontal docking storage of double vertical shafts. The two wells are symmetrically melted to build double cavities, and finally the two cavities are combined into one. However, in the process of cavity construction, it is necessary to combine The traditional single-well convection or oil cushion method has a limited effect on increasing the cavity-making speed, and the distance between the two wells is small and the flow rate is not large.

Method used

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  • A rapid construction of salt cavern storage technology for asymmetrical brine mining with double wells
  • A rapid construction of salt cavern storage technology for asymmetrical brine mining with double wells
  • A rapid construction of salt cavern storage technology for asymmetrical brine mining with double wells

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Effect test

Embodiment 1

[0042] For salt deposits (the burial depth is -1000 ~ -1800m, the total thickness is about 800m), the rapid construction of salt cavern storage technology is adopted by double-well asymmetrical brine mining, which is realized through the following steps:

[0043] (1) Arrange two salt wells (well spacing 300m) in the mining area and realize horizontal connection, one of which is vertical well 1 (well number is Z1), and the other well is horizontal well 2 (well number is S1);

[0044] (2) In the two salt wells, the running position of production casing 3 in Z1 is -1780m, and the running position of production casing 5 in S1 is -1600m;

[0045] (3) Use the production casing of Z1 to inject water into the lower salt group, and the saturated or nearly saturated brine is extracted from the production casing 5 of S1 through the downhole communication channel;

[0046] (4) After 16 months of water solution mining, use sonar cavity measurement technology to measure the cavity size and ...

Embodiment 2

[0054] For salt deposits (the burial depth is -900 ~ -1400m, the total thickness is about 500m), the rapid construction of salt cavern storage technology is adopted by double well asymmetrical brine extraction, which is realized through the following steps:

[0055] (1) Arrange two salt wells (well spacing 250m) in the mining area and realize horizontal connection, one of which is vertical well 1 (well number is Z2), and the other well is horizontal well 2 (well number is S2);

[0056] (2) In the two salt wells, the running position of production casing 3 in Z2 is -1380m, and the running position of production casing 5 in S2 is -1250m;

[0057] (3) The production casing of Z2 is used for water injection and water-soluble mining of the lower salt group, and saturated or nearly saturated brine is extracted from the production casing 5 of S2 through the downhole communication channel;

[0058] (4) After 12 months of water solution mining, use sonar cavity measurement technology t...

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Abstract

The invention relates to a technology for using twin-well asymmetrical brine collection to quickly build a salt cavern storage cabin. The technology specifically comprises the steps of using communication of a large-well-spacing twin well in a well-and-rock-salt mine area to conduct asymmetrical water dissolving mining on rock salt, and quickly building a single cavern in a salt-bearing strata; at the same time adjusting position of a pipe orifice of a production casing by combining a detection result of an underground salt cavern and using a pipe cutting method so that a shape of an underground salt collecting cavern is controlled artificially, and the size and shape of the salt collecting cavern can finally conform to a cavern building standard of a oil-storage-gas-storage cavern, wherein in the cavern building process, spacer liquid or spacer gas do not need to be injected. According to the technology for using twin-well asymmetrical brine collection to quickly build salt cavern storage cabin, the oil-storage-gas-storage cavern can be built in various kinds of well and rock salt, and the technology is particularly applicable to building of a large scale single cavern in an ultra-thick rock salt seam; meanwhile, brine concentration is increased, cavern building period is sharply shortened, and building cost of the salt cavern storage cabin is lowered.

Description

technical field [0001] The invention relates to a process for rapid construction of a salt cavern storage by asymmetrical brine mining in double wells, which specifically utilizes the asymmetrical water-soluble mining of well mineral salt in horizontally connected wells (one vertical well and one horizontal well) with large well spacing; according to the results of sonar cavity measurement , using the pipe cutting method to timely adjust the nozzle position of the production casing of the vertical well, control the shape of the underground dissolution cavity, and finally make the dissolution cavity of the vertical well meet the standard requirements of the salt cavern oil and gas storage. The invention can build salt cavern oil storage and gas storage in various types of well mine salts, and is especially suitable for building large-scale energy storage in ultra-thick rock salt mine layers. Background technique [0002] Due to the advantages of good sealing, easy excavation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F17/16E21B43/28E21B29/00
CPCE21B29/00E21B43/28E21F17/16
Inventor 刘凯刘正友张文广王桂春郑仲军卢青峰宋茜茜
Owner 江苏苏盐井神股份有限公司
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