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Gas injection and production method for communicating well salt cavern gas storage

A technology of gas injection and production and gas storage, which is applied in the fields of mining fluids, mining devices, mining equipment, etc., can solve the problems of long construction period, large proportion of bottom gas, and easy reduction of the volume of salt caverns, so as to improve the use efficiency, The effect of slowing down volume reduction and improving geological stability

Active Publication Date: 2019-05-14
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, salt cavern gas storage has problems such as long construction period, easy shrinkage of salt cavern volume and large proportion of bottom gas, which has a negative impact on the construction and operation of salt cavern gas storage

Method used

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  • Gas injection and production method for communicating well salt cavern gas storage
  • Gas injection and production method for communicating well salt cavern gas storage
  • Gas injection and production method for communicating well salt cavern gas storage

Examples

Experimental program
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Effect test

Embodiment 1

[0037] In the rock salt mining area, the construction of the salt cavern gas storage was completed by using two connected wells, Company 1 and Company 2. The distance between the wellheads of the two salt wells is 220m; The well can be used to store natural gas with a solution cavity volume of 400,000 m 3 , the maximum diameter of the dissolution cavity is 65m, and the depth range of the dissolution cavity is 1080-1280m; the depth range of the dissolution cavity of Well Lian 2 is 1270-1280m; the depth range of the connecting channel 8 is 1280-1290m.

[0038] In company 1, there are Φ177.8mm injection-production string 5 and Φ114.3mm cavitation string 6 inserted into the injection-production string. 28m; Lian 2 well is equipped with a Φ177.8mm brine injection string 7.

[0039] During the gas injection phase (such as figure 1 shown), the natural gas is injected into the gas storage at the same time through the injection-production string and cavity-making string of Well Lian ...

Embodiment 2

[0044] In the rock-salt mining area, the construction of the salt cavern gas storage was completed by using three interconnected wells, namely, Company 1, Company 2 and Company 3. The distance between the wellheads of two adjacent salt wells was 200m; Wells are used as brine injection and drainage wells; among them, the total volume of dissolved cavities in Wells Lian 1 and Lian 3 is 700,000 m 3 , the maximum diameter of the dissolution cavity is 70m, the depth range of the dissolution cavity of the two salt wells is 1100-1300m; the volume of the dissolution cavity of Lian 2 well is 20,000 m 3 , the depth range of the dissolution cavity is 1275-1300m; the depth range of the connecting channel 8 is 1300-1312m.

[0045] In wells Lian 1 and Lian 3, there are Φ177.8mm injection-production strings 5 ​​and Φ114.3mm cavitation strings 6 inserted into the injection-production strings. The mouth distance is 30m; the Lian 2 well is equipped with a Φ177.8mm brine injection string 7.

...

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Abstract

The invention relates to a gas injection and production method for a communicating well salt cavern gas storage. The gas injection and production method comprises the steps that communicating wells communicating with the communicating well salt cavern gas storage are divided into a gas injection and production well and a brine injection and discharge well. When gas is injected into the gas storage, natural gas is injected into the gas storage through the gas injection and production well, the natural gas drives brine from top to bottom, and the brine in the gas storage is discharged through the brine injection and discharge well. During gas production of the gas storage, brine is injected into the gas storage through the brine injection and discharge well, the brine drives natural gas frombottom to top, and the natural gas in the gas storage is extracted through the gas injection and production well. When gas is not injected in or produced from the gas storage, a certain amount of natural gas is reserved in the gas storage, fresh water or light salt water is injected into the gas storage through the gas injection and production well, brine is formed after rock salt is dissolved bythe fresh water or the light salt water, and the brine is discharged through the brine injection and discharge well. The problems that the cavity size of the salt cavern gas storage is easy to reduce, the backing gas proportion is large, and the construction period is long are solved, and safe and efficient operation of the communicating well salt cavern gas storage is achieved.

Description

technical field [0001] The invention relates to a gas injection and production method for connected well salt cavern gas storage, and belongs to the field of natural gas storage and the field of salt mine water-soluble mining. Background technique [0002] At present, the "brine extraction and cavity construction" and "injection-production operation" of the salt cavern gas storage are two different stages, that is, after the injection and production operation, the brine extraction and cavity construction will no longer be carried out. Due to the limitation of brine digestion capacity and brine receiving concentration, it usually takes a lot of time to construct a 200,000 m 3 The above-mentioned salt cavern gas storage generally takes more than 3 years to mine brine to build a cavity, which makes the construction period of the salt cavern gas storage usually longer. [0003] Salt cavern gas storage mostly adopts a single-well single-pipe structure, that is, only one well is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B43/28E21F17/16
Inventor 刘凯刘正友张文广
Owner 江苏苏盐井神股份有限公司
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