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Salt cavern gas storage reservoir double-tubing-string cavity making method

A technology for gas storage and salt cavern, which is applied in earth-moving drilling, mining equipment, mining equipment, etc., can solve the problem of high cost of water-soluble cavity making, and achieve the effects of low drilling construction cost, low water flow speed, and reduced energy consumption.

Inactive Publication Date: 2018-06-19
CHINASALT JINTAN
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: In order to overcome the deficiencies in the prior art, the present invention provides a double-pipe-string cavity-building method for salt-cavern gas storage to solve the problem of high cost of water-soluble cavity-building for salt-cavern gas storage. question

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  • Salt cavern gas storage reservoir double-tubing-string cavity making method
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  • Salt cavern gas storage reservoir double-tubing-string cavity making method

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Embodiment Construction

[0015] The present invention is described in further detail now in conjunction with accompanying drawing.

[0016] like figure 1 , figure 2 As shown in the figure, a double-pipe-string cavity-building method for a salt-cavern gas storage has the following steps:

[0017] a. Arrange the production casing 2 and the center pipe 3 in the single well, the production casing 2 is fixed in the wellbore through the cement sheath 1, the casing shoe is placed in the lower part of the salt layer, and the open hole 4 with a depth of 40m is reserved at the bottom of the well, and the center pipe 3 down to the bottom of the naked eye 4;

[0018] b. Cavities are gradually built upwards, and the height of the salt cavern 6 is increased by 30m at each step. The number of steps depends on the thickness of the salt layer 9. In addition, in order to protect the airtightness of the salt cavern 6, a part of salt should be retained on the top and bottom of the salt layer 9 Rock 9, in the first st...

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Abstract

The invention relates to a salt cavern gas storage reservoir double-tubing-string cavity making method. The salt cavern gas storage reservoir double-tubing string cavity making method comprises the steps that a production casing and a center tube are arranged in a single well, water injection brine extraction is conducted through the center tube and the annulus between the center tube and the production casing, fresh water is continuously injected to make deep salt rock dissolve so as to expand the size of a salt cavern, and the method of gradually up-adjusting tube shoes and repeated oil injection and oil return is adopted to control the shape of the salt cavern. According to the salt cavern gas storage reservoir double-tubing-string cavity making method, the well body structure is simplified, the using amount of tubing, cement and diesel oil are saved, due to the fact that the annulus between the production casing and the center tube is larger than the annulus between a middle tube and a center tube in a three-tube oil pad method, under the condition of the same displacement, the water flow speed is low, the pipeline resistance is low, and energy consumption of water injection isreduced accordingly.

Description

technical field [0001] The invention relates to the technical field of water-solution cavity-building for salt-cavern gas storage, in particular to a double-pipe-string cavity-building method for salt-cavern gas storage. Background technique [0002] In the early days, in order to mine deep salt rocks, a variety of drilling and water solution mining methods were formed, mainly divided into single well convection method and well group connection method. The former includes simple convection method, oil cushion convection method, air cushion convection method, and the latter includes convection well dissolution connection method, hydraulic fracturing connection method and directional well connection method, etc. In recent years, the underground caverns formed by water solution mining of domestic salt mines have been used to store natural gas, and significant economic benefits have been achieved. It's worth noting that not all old accents are available. The reason is that the...

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Application Information

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IPC IPC(8): E21F17/16
CPCE21F17/16
Inventor 谢卫炜徐孜俊马旭强赵云松
Owner CHINASALT JINTAN
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