Rapid solution construction method for rock salt cavity

Abstract

The invention relates to a rapid solution construction method for a rock salt cavity, belonging to the field of salt deposit solution mining and rock salt cavity reservoir controlled solution construction. The method is characterized in that the method comprises the following steps that: (1) a single well is drilled from ground to a target deposit; (2) after a pipe string system is installed according a conventional method, direct and reverse circulating solution can be conducted to construct a cavity through a water filling pipe string system and a water draining pipe string system; and (3) in the process of direct and reverse circulating solution to construct the cavity through water filling and water draining, according to the variation of the size and the dimension of the cavity, the positions of water filling pipe columns and water draining pipe columns and the spacing thereof are adjusted in time to keep the migration velocity of fluid near the wall of the cavity and the rock salt solution velocity to be highest. Since the positions of water filling pipe columns and water draining pipe columns and the spacing thereof are scientifically adjusted to increase the convective diffusion velocity of solution near the wall of the cavity and to further increase the rock salt solution velocity and the cavity construction velocity, the goals of economic rock salt resource mining and high-efficiency rapid low-cost rock salt cavity construction are reached. The method is an ideal method for high-efficiency mining of rock salt and rapid solution construction of rock salt cavity reservoirs.

Description

technical field

[0001] The invention relates to a fast-dissolving method for constructing salt rock caverns, which belongs to the technical category of water-soluble mining of salt deposits, and is suitable for underground salt deposit mining and construction of salt rock caverns. The technical method of construction. Background technique:

[0002] Due to the characteristics of salt minerals being easily soluble in water, the mining of underground salt minerals usually adopts the method of water solution mining. Commonly used water-soluble mining methods include: single well convection method, double well hydraulic fracturing connected convection method, double well directional docking connected convection method, group well fracturing connected connected convection method, etc. According to different geological conditions, different methods can be adopted for the exploitation of salt mine resources. In order to increase the service life of the well group and reduce the dr...

Examples

Embodiment approach 1

[0020] refer to figure 1 , 2 as shown,

[0021] A method for constructing a fast-dissolving salt karst cavity, the steps of which are:

[0022] (1) Drill a single well from the surface to the target deposit;

[0023] (2) After the installation of the pipe string system is completed according to the conventional method, at the initial stage of cavity dissolution construction, the distance between the two nozzles is 25m, and the positive circulation method is adopted to inject water from the center pipe and produce brine from the middle pipe;

[0024] (3) The construction of the cavity starts from the bottom of the cavity first, and then enters the construction stage of the main body of the cavity. The radius of the cavity gradually increases to 30m, and the distance between the two pipes is 45m. The reverse circulation method is used to inject fresh water from the middle pipe, and the center Pipe brine for production;

[0025] (4) In the main stage of cavity construction, t...

Embodiment approach 2

[0028] refer to figure 1 , 2 as shown,

[0029] A method for constructing a fast-dissolving salt karst cavity, the steps of which are:

[0030] (1) Drill a single well from the surface to the target deposit;

[0031] (2) After the installation of the pipe string system is completed according to the conventional method, at the initial stage of cavity dissolution and construction, the distance between the two nozzles is 30m, and the positive circulation method is adopted to inject water from the center pipe and discharge brine from the middle pipe for production;

[0032] (3) When the cavity is constructed, the bottom of the cavity is constructed first, and then the main body of the cavity is constructed. The radius of the cavity gradually increases to 30m, and the distance between the two pipes is 50m. The reverse circulation method is adopted, and fresh water is injected from the middle pipe and out of the central pipe. brine for production;

[0033] (4) In the main stage ...

technical field

[0001] The invention relates to a fast-dissolving method for constructing salt rock caverns, which belongs to the technical category of water-soluble mining of salt deposits, and is suitable for underground salt deposit mining and construction of salt rock caverns. The technical method of construction. Background technique:

[0002] Due to the characteristics of salt minerals being easily soluble in water, the mining of underground salt minerals usually adopts the method of water solution mining. Commonly used water-soluble mining methods include: single well convection method, double well hydraulic fracturing connected convection method, double well directional docking connected convection method, group well fracturing connected connected convection method, etc. According to different geological conditions, different methods can be adopted for the exploitation of salt mine resources. In order to increase the service life of the well group and reduce the dr...

Examples

Embodiment approach 1

[0020] refer to figure 1 , 2 as shown,

[0021] A method for constructing a fast-dissolving salt karst cavity, the steps of which are:

[0022] (1) Drill a single well from the surface to the target deposit;

[0023] (2) After the installation of the pipe string system is completed according to the conventional method, at the initial stage of cavity dissolution construction, the distance between the two nozzles is 25m, and the positive circulation method is adopted to inject water from the center pipe and produce brine from the middle pipe;

[0024] (3) The construction of the cavity starts from the bottom of the cavity first, and then enters the construction stage of the main body of the cavity. The radius of the cavity gradually increases to 30m, and the distance between the two pipes is 45m. The reverse circulation method is used to inject fresh water from the middle pipe, and the center Pipe brine for production;

[0025] (4) In the main stage of cavity construction, t...

Embodiment approach 2

[0028] refer to figure 1 , 2 as shown,

[0029] A method for constructing a fast-dissolving salt karst cavity, the steps of which are:

[0030] (1) Drill a single well from the surface to the target deposit;

[0031] (2) After the installation of the pipe string system is completed according to the conventional method, at the initial stage of cavity dissolution and construction, the distance between the two nozzles is 30m, and the positive circulation method is adopted to inject water from the center pipe and discharge brine from the middle pipe for production;

[0032] (3) When the cavity is constructed, the bottom of the cavity is constructed first, and then the main body of the cavity is constructed. The radius of the cavity gradually increases to 30m, and the distance between the two pipes is 50m. The reverse circulation method is adopted, and fresh water is injected from the middle pipe and out of the central pipe. brine for production;

[0033] (4) In the main stage ...

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