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Construction method for rock salt cavity gas storage house

A construction method and technology of salt rock karst cave, which is applied in the field of rapid dissolution construction and gas storage operation of underground storage in salt rock deposits, can solve the problems of prolonging the cavity building period, high oil-water interface detection cost, and affecting the quality of brine, so as to achieve saving cost, the effect of saving the cost of brine purification treatment

Inactive Publication Date: 2008-12-03
TAIYUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) The chamber building speed is slow and the period is long (generally 3 to 5 years), which affects the rapid use of the gas storage; (2) The diesel oil pollutes the brine seriously, which affects the quality of the brine and requires a certain amount of cleaning Treatment measures and costs; (3) In the process of controlling dissolution, regular oil-water interface detection is expensive and difficult to measure, which increases the cost of cavity building and prolongs the cavity building cycle

Method used

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  • Construction method for rock salt cavity gas storage house

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Experimental program
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Effect test

Embodiment approach 2

[0035] III. After well cementing, run the water injection pipe 2 and the brine collection pipe 1 into the surface casing 3, the water injection pipe 2 and the brine collection pipe 1 are concentric pipe strings, wherein the outer pipe is the water injection pipe, and the inner pipe is the brine collection pipe;

[0036] VII. When the difference between the thickness of the salt layer and the height of the solution cavity reaches 45m, the injection of fresh water and brine extraction will be stopped, and the downward construction of the gas storage will be completed by gas injection and extraction of brine.

Embodiment approach 3

[0038] VII. When the difference between the thickness of the salt layer and the height of the solution cavity reaches 55m, stop the fresh water injection and brine extraction, and complete the construction of the gas storage by gas injection and extraction of brine, and the rest are the same as in Embodiment 1.

Embodiment approach 4

[0040] VI. When the radial dimension of the dissolution cavity at the level of the lower part of the natural gas 4 reaches 50 meters, lower the water injection pipe 2 and the brine extraction pipe 1, continue to inject the natural gas 4 to the level of the lower port of the water injection pipe 2, repeat steps IV to VI, and the rest are the same Embodiment 1.

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Abstract

The invention relates to a construction method for a gas storage reservoir in a rock salt cavity, belongs to the salt mine mining and the rock salt cavity utilization fields, and mainly used for the dissolution construction of an underground gas storage reservoir in a eutectic salt deposit. The construction method is characterized in that a method for down-flow type gas storage reservoir construction comprises the following steps: fresh water is infused into a salt deposit by a water injection pump and through a water injection pipe, the rock salt is dissolved from up to down, and at the same time, the natural gas is infused; the expenses for oil consumption of the original oil cushion method and the cost for brine purification treatment can be saved by using the method; and the method is more economical and more environment-friendly. The gas storage reservoir can be used from the beginning of construction; the single well oil cushion method with three to five years of construction cycle is not required for constructing the gas storage reservoir; the construction of the gas storage reservoir needs no cycle basically; the reservoir storage capacity is small in the beginning period; the gas storage reservoir can be used as a large gas storage reservoir in the middle and the late periods; the problems of long period for the construction of the gas storage reservoir by using the oil cushion method, difficult detection of the oil water interface, as well as other relative technical problems are thoroughly solved; and the construction method is an ideal method for rapid dissolution construction of the gas storage reservoir in the rock salt deposit.

Description

technical field [0001] The invention relates to a construction method of a salt rock karst cavity gas storage, which belongs to the category of salt mining and salt rock karst cavity utilization, and is mainly used for the dissolution and construction of underground gas storage in soluble salt deposits, and is an underground storage of salt rock deposits A quick solution to building and running on gas. Background technique [0002] Due to the advantages of strong compactness, low porosity and good sealing, salt rock deposits are regarded as ideal places for oil and gas storage and waste disposal. Utilizing the characteristics that salt rock is easily soluble in water, oil and gas storages are built in salt rock deposits. Generally, the traditional single-well water solution mining method is used, supplemented by certain controlled dissolution technology, and the shape of the dissolved cavity is controlled and dissolved. The single-well water-soluble mining method is to dril...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/28E21F17/16
Inventor 梁卫国徐素国赵阳升莫江吴迪
Owner TAIYUAN UNIV OF TECH
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