Rock salt mine mining methodTechnical Field
The invention relates to a rock salt mine mining method.
Background
At present, the main mode of rock salt mining is well drilling and water dissolution mining, and the common methods comprise single-well convection brine mining, fracturing communication brine mining and horizontal butt joint communication brine mining; the implementation process of horizontal butt joint communication halogen extraction is shown in figures 1 and 2: 1. firstly, constructing a straight well 11, and building a salt tank (small-scale dissolving cavity) by using the straight well; 2. constructing a horizontal well 12, wherein a horizontal section 13 of the horizontal well is communicated with a salt tank of the front vertical well 11; 3. the horizontal well 12 and the vertical well 11 form a group of communicated brine extraction units for brine extraction (the vertical well 11 and the horizontal well 12 alternately inject water and extract brine); the main disadvantages of the brine collection process are as follows: firstly, a brine extraction channel consisting of a vertical well and a horizontal well can only dissolve salt layers above and on the side surface due to the characteristic of water soluble mining, so that rock salt below a section of track from a casing shoe 14 of the horizontal well 12 to an inclination increasing section 15 cannot be dissolved; on the horizontal plane, due to the existence of the casing shoe 14, the dissolution starting point at the bottom of the horizontal well is deviated by the offset amount S, so that the projection area 16 of the dissolution cavity capable of extracting rock salt on the horizontal plane is reduced, and the resource amount of the rock salt capable of being extracted is reduced; all of the above influences the recovery rate of rock salt resources.
Disclosure of Invention
The invention aims to provide a rock salt mining method aiming at the defects of the prior art, which solves the problems that rock salt from a casing shoe to an inclined section cannot be dissolved and the dissolution point is deviated, and can improve the recovery rate of rock salt resources.
In order to achieve the purpose, the rock salt mine mining method comprises the following steps: A) constructing a straight well A and building a salt tank; it is characterized by also comprising: B) constructing a straight well B and building a salt tank; c) Constructing a horizontal well, wherein the horizontal well comprises a straight well section, an inclination increasing section and a horizontal section, and the horizontal section is communicated with the salt troughs of the straight wells A and B; D) cementing and plugging a horizontal section of the horizontal well, separating the horizontal well from an adjacent vertical well, and keeping the two vertical wells A and B communicated; E) and horizontally butting and communicating to recover the brine through the two vertical wells A and B.
According to the invention, the brine extracting unit is finally formed by the two straight wells, so that the problems that rock salt from the original casing shoe to the inclined section cannot be dissolved and the dissolution point is shifted are solved, the projection area of a dissolution cavity formed by the two straight wells on a plane is larger, and the recovery rate of rock salt resources can be improved;
as a further improvement of the invention, a horizontal well can be transformed into a vertical well, and single-well convection brine extraction is carried out in the well; the well can be utilized and brine can be extracted;
As a further improvement of the invention, a horizontal well can be transformed into a vertical well and used as the next vertical well communicated with a brine extraction unit; more efficient bittern collection is realized;
in conclusion, the invention eliminates the problems that rock salt from the position of the casing shoe to the inclination increasing section cannot be dissolved and the dissolution starting point is deviated, and can improve the recovery rate of rock salt resources.
Drawings
FIG. 1 is a front view of a prior art horizontal butt joint communication bittern collection.
Fig. 2 is a schematic diagram of the projected area of the cavern corresponding to the horizontal well-vertical well-horizontal well-formed brine production unit in fig. 1.
Fig. 3 is a front view of an embodiment of the present invention.
Fig. 4 is a schematic diagram of the projected area of the two vertical wells in fig. 3 corresponding to the cavity on the plane.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 3 and 4, the rock salt mining method of the embodiment includes the following steps: A) constructing a straight well 1 and building a salt tank; B) constructing a straight well 2 and building a salt tank; c) Constructing a horizontal well 3, wherein the horizontal well comprises a straight well section, an inclination increasing section 4 and a horizontal section 5, and the horizontal section 5 is communicated with salt troughs of the straight wells 1 and 2; D) the horizontal section 5 of the horizontal well 3 is plugged by cement 6, the horizontal well 3 is separated from the adjacent vertical well 2, and the two vertical wells 1 and 2 are still communicated; E) horizontally butting and communicating to extract brine through the two vertical wells 1 and 2; F) and (3) transforming the horizontal well 3 into a vertical well, and carrying out single-well convection current brine extraction in the vertical well.
According to the invention, the horizontal section 5 is blocked by the cement 6, and finally the two vertical wells 1 and 2 form a brine extracting unit, so that the problems that rock salt from the original casing shoe to the deflection increasing section 4 cannot be dissolved and the dissolution starting point is deviated are solved, the projection area 7 of a dissolution cavity formed by the two vertical wells 1 and 2 on the plane is larger, and the recovery rate of rock salt resources can be improved; the horizontal well 3 can also carry out single-well convection brine extraction;
The invention is not limited to the above embodiment, and after two vertical wells 1 and 2 form a brine-extracting unit, the horizontal well 3 can be transformed into a vertical well and used as the next vertical well communicated with the brine-extracting unit, so that more efficient brine extraction can be realized.