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Method for constructing horizontal salt rock dissolving cavity reservoirs

A technology of salt rock dissolution cavity and construction method, which is applied to drilling equipment and methods, construction, earthwork drilling and mining, etc. It can solve problems such as difficult control, unfavorable regular shape storage storage construction, poor shape of dissolution cavity, etc., and achieve large storage capacity Effect

Active Publication Date: 2015-06-03
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a fast and short period of convective cavity creation through the connection of two wells, but it has the disadvantage of poor solution cavity shape (similar to a dumbbell shape) and is difficult to control, which is not conducive to the construction of regular shape storage.

Method used

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  • Method for constructing horizontal salt rock dissolving cavity reservoirs
  • Method for constructing horizontal salt rock dissolving cavity reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] refer to figure 1 as shown,

[0028] A method for constructing a horizontal salt rock cavern storage, the steps of which are:

[0029] Ⅰ. Drill the vertical shaft and the deflected shaft from the ground to the middle position in the thickness direction of the target salt rock deposit, run the integral casing on the two sections of the vertical shaft and the deflected shaft, and carry out the full-length cement grouting cementing behind the wall;

[0030] Ⅱ. Drill a horizontal well 4 along the horizontal principal stress direction in the target salt rock deposit through the vertical shaft and the deflection well casing. Depending on the distribution of the ore deposit in the horizontal stress direction, the length of the horizontal well is 800m;

[0031] Ⅲ. Install the concentric production string system in vertical wells, deflected well casings and newly drilled horizontal wells. The string system is arranged along the entire length of the horizontal well. 1 The flowe...

Embodiment approach 2

[0039] Ⅱ. Drill a horizontal well 4 along the horizontal principal stress direction in the target salt rock deposit through the vertical shaft and the deflection shaft casing. The length of the horizontal well is 900m depending on the distribution of the ore deposit in the horizontal stress direction;

[0040] Ⅲ. In vertical wells, casings of deflected wells and newly drilled horizontal wells, install the concentric production string system, and the string system should be laid along the entire length of the horizontal well. The length of the side wall flower hole jet section 3 is 15m, inject fresh water into the salt rock deposit through the blind end of the side wall flower hole jet section 3 of the water injection pipe 1, dissolve the salt rock around the horizontal well 4, and the brine after dissolving the salt rock passes through the water outlet pipe 2 and the annulus between the water injection pipe 1 are discharged to the ground;

[0041] Ⅳ. In the pipe string system,...

Embodiment approach 3

[0046] Ⅱ. Drill a horizontal well 4 along the direction of the maximum horizontal principal stress in the target salt rock deposit through the casing of the vertical shaft and the deflection shaft. Depending on the distribution of the ore deposit in the direction of the horizontal stress, the length of the horizontal well is 1000m;

[0047] Ⅲ. In vertical wells, casings of deflected wells and newly drilled horizontal wells, install the concentric production string system, and the string system should be laid along the entire length of the horizontal well. The length of the side wall flower hole jet section 3 is 20m, inject fresh water into the salt rock deposit through the blind end of the side wall flower hole jet section 3 of the water injection pipe 1, dissolve the salt rock around the horizontal well 4, and the brine after dissolving the salt rock passes through the outlet pipe 2 and the annulus between the water injection pipe 1 are discharged to the ground;

[0048] Ⅳ. ...

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Abstract

The invention discloses a method for constructing horizontal salt rock dissolving cavity reservoirs, and belongs to categories of salt deposit water dissolving mining and salt rock dissolving cavity controlling, dissolving, constructing and utilizing. The method for constructing the horizontal salt rock dissolving cavity reservoirs has the advantages that the quick horizontal salt rock dissolving cavity reservoirs which are high in efficiency and capacity and have shapes easy to control can be constructed by means of directional drilling and cyclic retreating type single-well convection dissolving; merits of a single-well convection process and merits of double-well directional butting communication convection process are combined with one another, fresh water is injected into salt rock deposits by patterned hole jet flow sections 3 on the side walls of blind ends of center pipes, brine which is generated after salt rock is dissolved is drained out of earth surfaces from annular spaces between the center pipes and middle pipes, cavities are constructed by means of periodic sectioned retreating type dissolving, and large horizontal dissolving cavities can be constructed by means of single-well convection; the lengths of horizontal wells can reach 800-1000m, the constructed horizontal salt rock dissolving cavity reservoirs are high in capacity, and the method is a perfect method for quickly constructing the large horizontal salt rock dissolving cavity reservoirs by means of dissolving.

Description

technical field [0001] The invention relates to a method for constructing a horizontal salt rock karst cavity storage, which belongs to the category of salt rock ore deposit water solution mining and salt rock karst cavity storage controlled dissolution construction and utilization. It is mainly used for water solution mining of layered salt rock deposits and the construction of horizontal solution cavity storage. It is a special water solution mining and solution cavity storage construction method. Background technique [0002] Due to the characteristics of salt minerals being easily soluble in water, the technical method of water solution mining is often used in the mining of underground salt minerals. Commonly used mining methods include: single well convection method, double well directional docking connected convection method, double well hydraulic fracturing connected convection method, group well fracturing connected control dissolution method, etc. According to diff...

Claims

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Application Information

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IPC IPC(8): E21F17/16E21B43/28E21B7/20
CPCE21B43/28E21B47/003E21F17/16
Inventor 梁卫国徐素国张传达赵阳升
Owner TAIYUAN UNIV OF TECH
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