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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  • 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 sol

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

Example Embodiment

[0026] Implementation mode 1:

[0027] reference figure 1 As shown,

[0028] A method for constructing a horizontal salt karst cavity reservoir, the steps are:

[0029] Ⅰ. From the ground to drill the shaft and deflection well to the middle position in the thickness direction of the target salt rock deposit, run the integral casing for the two sections of the shaft and deflection well and carry out the full-length cement grouting behind the wall;

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

[0031] Ⅲ. In vertical wells, deviated well casings and newly drilled horizontal wells, install the concentric production pipe string system. The pipe string system is arranged along the full length of the horizontal well. The sidewall flower hole...

Example Embodiment

[0038] Embodiment 2

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

[0040] Ⅲ. In vertical wells, deviated well casings and newly drilled horizontal wells, the concentric production string system shall be installed. The string system shall be arranged along the entire length of the horizontal well. The side wall flower hole jet section 3 is 15m in length. Fresh water is injected into the salt rock deposit through the blind end side wall flower hole jet section 3 of the water injection pipe 1, dissolving the salt rock around the horizontal well 4, and the brine after dissolving the salt rock passes through the outlet pipe 2 The annular gap between the 2 and the water injection pipe 1 is drained to the ground;

[0041] Ⅳ. In the pipe string sys...

Example Embodiment

[0045] Embodiment 3

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

[0047] Ⅲ. In vertical wells, deviated well casings and newly drilled horizontal wells, the concentric production string system shall be installed. The string system shall be arranged along the entire length of the horizontal well. The side wall flower hole jet section 3 is 20m in length, and fresh water is injected into the salt rock deposit through the blind end side wall flower hole jet section 3 of the water injection pipe 1, dissolving the salt rock around the horizontal well 4, and the brine after dissolving the salt rock passes through the outlet pipe 2 The annular gap between the 2 and the water injection pipe 1 is drained to the ground;

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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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