Method of forming insulating curtains around mining

 

(57) Abstract:

The invention relates to mining and can be used to create a favourable geological conditions during the construction and operation of the mine workings. The invention consists in that the method for forming the insulating curtains around the mine workings in the interwell space includes the drilling of injection wells and staged injection of cement slurry, provides for continuous registration of a number of process parameters during the formation of the veil. After injection into the rocks of the aquifer through wells next stage of the project volume of cement slurry calculating the mean value of the coefficient of absorption capacity of each well. Their values are compared among themselves, the quality of the insulation of the veil is satisfactory if the values (e) of this (these) coefficients (a) for wells (s) plugged(Oh) at the final stage of forming the insulating curtains, the following values(I) coefficients(a) for wells(s) plugged(Oh) in the initial and intermediate stages of the formation of this gate. 3 C.p. f-crystals, 1 Il.

The invention against which royaliste and operation of mines.

The known method of forming the insulating curtains, which includes the drilling of injection wells around the future path of the trunk, stage injection of cement slurry, providing a continuous pressure on the discharge pipeline and flow of cement slurry and the definition of quality insulating curtains (see the Handbook for the construction of mine shafts in special ways. Ed. by N. G.Tropica, M. Nedra, 1980).

For the implementation of this method requires the drilling of a large number of monitoring wells designed to implement state monitoring companyremoval array in the process of forming the insulating curtains, which is associated with significant additional costs. Despite this, in practice, this method is not reasonably reliable quality control of the formation of the insulating curtains, which often leads to emergency situations in the process of sinking in the operation of mines.

The aim of the invention is to improve the safety and efficiency of mining operations in conditions watered formation by increasing the reliability of control of the process of forming the insulating curtains the e scope of work of the research cycle. In addition, this invention provides a direct connection between the quality control of the veil with the technological parameters that determine the process of forming the same veil by standard methods.

To solve this problem measure the flow of cement slurry to each well and the pressure on her mouth for injection into the aquifer through the well design (calculated) volume of solution at each stage of the work. According to the data obtained, calculate the average value of the coefficient of absorption capacity of each well by the formula:

< / BR>
where qmijthe consumption of the j-th portion of the cement slurry injected into the j-th aquifer wells, m3;

Pmijthe pressure at the wellhead during injection of a j-th portion of the solution in the i-th aquifer, MPa;

tmijtime discharge the j-th portion of the solution in the i-th aquifer wells;

m the number of wells, tamponirovanie for the next stage of formation of the insulation of the veil.

After calculating the values of these coefficients are compared with each other. The quality of the insulation of the veil in the interwell space is UD is echnol stage of formation of the veil, lower values of the coefficients of the absorption capacity of wells, plugged in the primary and intermediate (earlier) stages of formation of the veil:

< / BR>
wheremthe number of wells, temporarely at the final stage of forming the insulating curtains.

In the case of establishing the fact of the unsatisfactory quality of the formation of the insulating curtains in the interwell space in wells, plugged(th) at the final stage of formation of this gate, inject an additional amount of cement slurry.

In conditions of significant directional filtering of groundwater, as well as by cementation of fine and tocotrienols aquifer rocks and cementing work on the salt and potash mines to use as backfill previously drilled freezing of wells core insulation veil shape under the protection of an additional insulating curtains, available from the head of groundwater and partially or completely covering the core veil. Additional veil shape by injection of cement slurry through an additional number of wells. The quality of the main and additional insulating curtains is the th row, temporarely at the initial and intermediate stages of forming an additional insulating curtains;

mthe number of additional wells series, temporarely at the final stage of forming an additional insulating curtains.

In the case of establishing the fact of the unsatisfactory quality of the formation of primary or secondary insulating barriers at the inter-well space in wells, plugged on final stage of forming, respectively, a primary or secondary screens, upload additional amount of cement slurry.

Inequality (2) and (3) established on the basis of the analysis of the statistical information obtained in the course of forming the insulating curtains in various geological and mining conditions. The analysis showed high reliability of installed dependencies. Previously for the proposed purposes of these inequalities were not used.

Feature of the proposed method of forming an insulating curtains is that the quality control of its coefficient of absorption capacity of the wells is only possible if the grouting work stage, each stage is formed group magnetotunneling alternating with skipping some of the wells, through served in the rock mass grouting solutions, which form a local insulating areas. These wells have a coefficient of absorption capacity kmij..

On the last (final) stage of forming the insulating curtains first, this group of wells have also a factor absorption capacity equal to kmij. However, when the closure of the local insulating sections of the latter with the local insulating sections of the wells, plugged in the early stages of backfill, the ratio of the absorption capacity of wells final stage is sharply reduced due to the effect of the previous insulation sections and becomes equal .

Thus, the satisfaction values of the coefficients of the absorption capacity of wells defined in various stages of execution of grouting works, conditions of inequality (2) and (3) clearly indicates qualitative closure, a separate insulating sections into a single insulating veil.

The drawing shows a diagram of the stage plugging wells.

Refer to the following drawing: for example, the contour of the trunk; In azioni veil between the main wells 3 and 4; B. discontinuity insulating veil between wells 10 and 11 additional series; I and IV, the initial stage of formation of the primary and secondary insulating barriers through the main bore 1 and 5, and wells 9, 11 and 13 additional series; (II intermediate stage of formation of the veil through the main bore 3 and 7; III and V of the final stage of formation of the primary and secondary insulating barriers through the main bore 2, 4, 6, 8 and the hole 9 and 12 additional series; well 14-20 in conjunction with wells 9 -13 used for cementation of fine and tocotrienols aquifer rocks and cementing work on the salt and potash mines to create an additional veil completely covering the core. It is possible to use other layouts plugging wells.

Under the discontinuity of insulation veil refers to the absence of contact zones of distribution of cement slurry in the interwell space.

Below are examples of sequential technological operations of the proposed method in different variants of its use.

Option A. If horizontal, gentle and sloping shallow aquifer fractured th is) are drilling and plugging two diametrically opposed wells 1 and 5. Then at the intermediate stage of formation of the veil (zone II in Fig. 1) are drilling and plugging a couple of wells 3 and 7 are located on a diameter perpendicular to the first. At the final stage of formation of the veil (zone III in Fig. 1) are drilling and plugging of wells 2, 4, 6 and 8, located, for example, at an angle of 45oto the first two. In the process of pumping cement slurry into each hole continuously record the flow rate and pressure at the wellhead. After injection into each well of the project volume of cement slurry by the formula (1) calculating the mean value of the coefficient of absorption capacity of the well. After formation of the insulating curtains, judge its quality, i.e., continuity in the interwell space under the terms comply with the inequality (2) in the case of detection of the discontinuity of the veil in wells, plugged on final stage of formation of the veil, inject an additional amount of cement slurry.

For example, measurement data show that the coefficients of the absorption capacity of the wells is: (k12,1; k52,15; k32,2; k72,1; k21,9; k42,5; k61,85; k81,8)10-3m3/MPas. Average values coalitional veils, below in comparison with the average values of these coefficients wells, plugged in the initial and intermediate stages of formation of the veil. The exception is the value of the coefficient of absorption capacity wells 4 (k42,110-3m3/MPa), greater values in this ratio adjacent wells 3 and 5 (k52,1510-3m3/MPas, k32,210-3m3/MPas).

The latter fact indicates the discontinuity of insulation veil between the two wells (see Fig.1), to remove it is necessary in the hole 4 to inject an additional amount of cement slurry, for example 25% of its design value. The condition of inequality (2) confirms the proper quality insulation around the veil mining, in particular between wells and 1-3 4-8.

For operational monitoring of the quality of the insulation of the veil in the inter-well space, the time factor in the formula (1) can be omitted, especially because of its influence in the process of creating a relatively small insulating curtains slightly.

Option B. Under the same conditions as above but significant directional filtering underground is And on the path of groundwater flow are drilling and plugging of wells 9, 11, 13 additional series. Then at the final stage of the formation of additional curtains (zone V in Fig. 1) are drilling and plugging of wells 10 and 12. In the process of pumping cement slurry into each hole continuously record the process parameters of the injection, and after injection into a well designed volume of the solution by the formula (1) calculate the average values of the coefficients of the absorption capacity of wells, in which judge the quality of formation of the insulating curtains, i.e., continuity of the additional insulation of the array. The results of measurements, for example, show that (k92,7; k112,7; k132,75; k103,15; k122,55)10-3m3/MPas.

These data indicate the discontinuity of insulation veil between wells 10 and 11. To address this shortcoming in the borehole 10 inject an additional amount of cement slurry. After that fully carries out a complex of works listed in option A. the average values of the coefficients of the absorption capacity of the main wells should be lower in comparison with the same coefficients of adjacent wells additional series, as it follows from formula (3).

Option C. When the CEM is Oh using as backfill previously drilled freezing of wells and method "triangles" at the initial stage of forming an additional insulating curtains are drilling and plugging of wells 10, 14 and 18 additional series (see Fig. 1). At an intermediate stage of formation of additional veils are drilling and plugging of wells 12, 16, 20, at the final stage of the well 9, 11, 13, 15, 17, 19. After forming the additional insulating curtains through bore 9 20, the values of the calculated coefficients are judged on the quality of forming an additional insulating curtains. After the formation of high-quality additional insulating curtains initiate the formation of the main insulation of the veil, as described in option A. the main Continuity of the veil appreciate with regard to formula (3).

The proposed method is characterized by ease of implementation, speed control, reliability and a high degree of safety of mining operations in complex hydrogeological conditions, low cost due to the exclusion of work on additional drilling monitoring wells and drilling plugged wells low volume of research work cycle.

1. Method of forming insulating curtains around the mine workings, including the drilling of injection wells around the future path of these workings, stage injection of cement slurry, predusmatrivaetsya quality insulating curtains, characterized in that on each well for injection into an aquifer through wells this stage of the design discharge volume of cement slurry registration of consumption of the latter, the pressure on the discharge piping and the time of discharge of each portion of the solution, determine the average value of the coefficient of absorption capacity of each well according to the formula

< / BR>
where qmijthe consumption of the j-th portion of the cement slurry injected into the i-th aquifer wells, m3;

Pmijthe pressure at the wellhead during injection of a j-th portion of the solution in the i-th aquifer, MPa;

tmijtime discharge the j-th portion of the solution in the i-th aquifer wells;

m numbers of wells, temporarely for the next stage of formation of the insulating curtains

and the quality of the insulation of the veil in messagenum space determined by comparing these coefficients, which is satisfactory if the values of the coefficients of the absorption capacity of wells, plugged on final stage of formation of the veil, the following values of the coefficients of the absorption capacity of wells, Satan is, temporarely at the final stage of forming the insulating curtains.

2. The method according to p. 1, characterized in that the formation of the insulating curtains around mining excavations carried out under the protection of an additional insulating curtains, available from the pressure of groundwater, partially or completely covering the main curtain and stage formed by injection of cement slurry through the additional number of wells, and the quality of the main and additional insulating curtains determine the terms and conditions satisfy the inequality

< / BR>
wheremthe number of additional wells series, temporarely on primary and polesotechnic stages of forming an additional insulating curtains;

mthe number of additional wells series, temporarely at the final stage of forming an additional insulating curtains.

3. The method according to PP.1 and 2, wherein when it is determined that the poor quality of the formation of primary or secondary insulating curtains in wells, stoneybrae (th) at the final stage of forming, respectively, a primary or secondary insulating curtains, finish additional volume timestat separately for each aquifer separate groups of wells at each stage of execution of works, using this method convergence wells, or method of triangles, or both of these method together.

 

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