SU968357A1 - Method of subterranean leaching of minerals from formation deposits - Google Patents

Description

The invention relates to mining and can be used in the development of reservoir-type deposits by underground leaching.

 The known method of underground leaching of minerals, in which a leaching solution is supplied to the ore body through linear rows of injection wells, and a productive solution is extracted through adjacent linear rows of pumpings, and the rows of injection and pumping wells alternate 1.

The closest to the invention is the method of underground leaching with an ore system of wells with their staggered arrangement and a ratio of the distances between the wells in the row and between the rows of 1: 2 to 2.

The disadvantage of the known methods is the uneven study of the area of the elementary cell, priuro. associated with the fact that the solutions move — along short and longer current lines — unevenly, with different intensities. During the period of mining in the short current lines, extraction of the mineral occurs almost completely, while

as in the long current lines less than half of the mineral is extracted from the ore. As a result, dilutions of solutions occur, a decrease in the concentration of productive solutions and an increase in the time periods for the development of deposits.

The aim of the invention is to increase the leaching efficiency

10 by increasing the productivity of the pumped-out wells by the extracted component.

The goal is achieved by leaching useful

The 15 components lead by rows of technological wells, while technological wells in the rows are located one from another at a distance related to the distance between the rows

20 ratio

1.25 2a,

where to is the distance between the rows

25

. wells} a - distance between wells

in r dah.

In addition, technology squans are arranged along a grid with respect to, 5. These limits are best for leaching of reservoir deposits, since, if the ratio is outside these limits, the productivity of the pumped wells in the recoverable component decreases. ъ. With Jfl 2, the productivity of the pumped wells decreases along with the growth rate (at the same position of the surplus in the pumping wells), and at 1, the average concentration of the useful component in the solution decreases. The closest l to the optimal is the use of a grid of technological, V t b wells with a ratio of - 1.5. FIG. 1 shows the estimated cxev ml placement of process wells; on fit. 2 - graphs of the intensity of extraction of the - useful component (I) from S, where 1 is a scheme with a staggered well; 2 - schemes with a linear well location (100% of the scheme with a linear arrangement of a squamine and b -) is 5 These ratios are obtained by calculating the performance of pumping wells by a useful component for various schemes for the placement of process wells. The calculations were performed by analog modeling of filtration flows on an EGDA device. When an optimal cell was found, they were examined eight times. displacement of technological wells with different ratios of distances between pumping and injection wells. And between the wells in the row (). When comparing the various well location schemes, the initial positions were assumed: - the working area per one pumping well is the same for all schemes and is equal to 2500 m (based on the most widely used well location network 50x25 m); - lowering the level in the pumping wells equally for all cxeMf -calculations of concentrations are made on current strips, based on the condition of an equal amount of transition of the useful component into the solution at equal values of G: T; - movement of solutions occurs according to the piston displacement scheme; - flow rate according to the 50jt25 m scheme is taken as a unit of consumption; - The well filter radius is assumed to be 0.05 m. The considered hydrodynamic systems were assumed to be composed of an infinite grid for oppression, body and production wells. The movement was considered two-dimensional and established. The flow rate of the injection wells was considered equal to the flow rate of production wells with the opposite sign. To calculate the flow rate of squat. Gin used Muskat's formula. As a result of the calculations, the productivity values of the considered cells were determined by the extracted component for the level in the form of 90% recovery. The results of the calculation are shown in the form of graphs in FIG. 2, where 1 scheme With a chessboard arrangement of wells, 2 - schemes with a linear arrangement of wells. As can be seen from the graphs, a rational field of application of areal dxeM well location for reservoir fields is 1.25 - 2. Schemes with a ratio The proposed method is implemented as follows. The field is drilled by technological wells located in the network, in which the ratio of the distance between the rows of wells to the distance between the wells in the rows is 1.5. In this case, the distance between the rows of wells is, for example, 43.5 m, and the distance between the wells is in the range of 29 m. During the construction of the wells, the reservoir is filled with leach solutions through injection wells. At the same time, the formation water is pumped out first, and, by the approach of the leaching solution, of the productive solutions from the pumping wells. Pumping is carried out at a decrease of 50 m Ie of the productive solution, the useful component is extracted, the leach solution is strengthened and fed to the injection well. The cycle is then repeated to the desired recovery level. When working with the proposed method, the development time is reduced by 25-30% when using the stipulated well location scheme and by 10-15% when using the known scheme with a staggered arrangement and a ratio of the distances between the wells in the row and between the rows 1: 2. : In comparison with the known methods, the proposed method provides a higher productivity of extraction of the useful component and, thus, a reduction in the processing time and e-rates per unit of production.

Claims (2)

Claim 1. Inland leaching method, minerals from stratum deposits, including opening the ore body with linear alternating rows of injection and pumping process wells, leaching agent injection and pumping of productive solutions, which are different in that in order to increase the efficiency of leaching by increasing the productivity of pumped wells in the extracted component, technological wells in rows are located one from another at a distance related to the distance between ratios one 1.25 2, where a is the distance between the squashes in r d d; B - the distance between the rows wells. 2. The method according to Claim 1, about tl to h and yuschi and the fact that technological wells have on the grid |. 1.5. with attitude Information sources, taken into account in the examination 1.Lunev L.I., Rudakov I.E. Dutyless metal leaching systems fishing M-.,: Colormetinformation, 1974, p. 26 .. 2. Mamilov V.A. et al. Uranium mining by the method of underground leaching) 1and M., Atokmzdat, 1980, p. 119 (prototype). S ES3