SU796464A1 - Method of complex degassing of mine fields - Google Patents

Description

(54) METHOD OF COMPLEX DEGASING OF MINE FIELDS

one

The invention relates to mining and can be used to combat gas and gas-dynamic phenomena in mines producing gas-bearing formations.

A known method for complex degassing of mine fields, based on suctioning gas from reservoirs and simultaneously involving the application of various methods of degassing a reservoir under development, drilled on pre-cast fields, with intensified gas production by hydraulic fracturing to create an additional network, and methods for degassing adjacent reservoirs in a removable field when degassing wells are connected to gas pipelines laid on the haulage and vent lines.

G1.

The disadvantage of this method is the large extent and branching of the drainage network due to the independent use on the excavation fields of various degassing methods, a large number of wells connected to the gas pipelines, which leads to a significant decrease in the vacuum generated by the vacuum pump and, consequently, the productivity of wells .

The method of complex degassing of mine fields based on a gas and reservoir suction, including the drilling of wells on approaching plates, of reservoir wells on excavation fields, which are communicated on one side of the main gas pipeline and on the other side, is well known. with the wellheads on the adjacent layers in the area of the floor to be removed 21.

This method is characterized by a smaller amount. connections to the gas pipeline than others, however, its efficiency is low, which requires the use in combination with it of other known methods of degassing 1 with their inherent drawbacks, which consist of E cn; 1 vacuum in the underground degassing network.

The purpose of the invention is to increase the vacuum in the degassing wells by reducing the amount of air leaks into the gas pipeline.

Claims (3)

The goal is achieved by the fact that in a mine field we drill wells on closely spaced reservoirs and reservoir wells on the excavation field, which are communicated on one side with the main gas pipeline, and on the bottom of the wellheads on the near bed , they intensify gas recovery of the reservoir by creating an additional interwell well network of cracks after an hour of reservoir wells located in the field outlined by workings between the wells, from which the gasification The formations are disconnected from the main gas pipeline and isolated from both sides of the workings. The gas that flows into the isolated wells goes through the interborehole fracture network to the wells through which the gas recovery of the reservoir has been intensified, and then to the main gas pipeline. FIG. Figure 1 shows a diagram of the complex degasadia of mine fields by wells drilled in the closely spaced formations and along the developed formation in the excavation fields; in fig. 2 — times the cut of the degassed formations cut A-A in FIG. one . The method of complex degassing of shah fields is carried out as follows. At the mine field, the reservoir under development 1 conducts excavations 2, and 2. Decontamination gas pipeline 3 lay on the development 2. From chambers (niches) 4 wells of well 5 in development plate 1 in the prepared field and wells 6/7 and 8 are in reservoir layers 9, 10 and 11. From production 2 in the developed reservoir wells in well 12 designed together with wells B for degassing the prepared field on which they will subsequently produce 13. For the intensification of gas recovery in the reservoir under development, an additional network of cracks is created, through which wells 5 and 12 (. subsequently wells 5 and 12, 5 and 12) communicate among themselves . A cross-well network of cracks is created (for example, by means of a hydroimpulse or electro-hydraulic effect on the formation, hydraulic fracturing or chemical action with acid solutions} of the well 5 on the field being prepared immediately after their drilling. The wells 5 and 12 are connected directly to the pipeline 3. At the contour workings of the field, the reservoir wells 12, drilled between the wells 5, from which the gas recovery was intensified, are disconnected from the pipeline 3 and insulated on either side of the workings with mechanical, pneumatic or hydraulic type cylinders or any kind of filling plugs. Reservoir wells 5 and 5 in front of the lava communicate with each other and, if necessary, with wells drilled on the closest formations within the exhausted floor of the well (6 and 8J). After the passage of the lava, wells 5 are reported with wells 6, 7 and 8 in the field to be retrieved. Gas released from contiguous formations to wells b, 7, 8 and b, 7, 8, are diverted to gas pipeline 3 through wells 5 and 5 before the lava approaches the wells 5 after it has passed. Gas released to gas pipes disconnected from the pipeline and isolated from the workings, reservoir wells 12 and 12. are diverted into the degassing system through values 5 and 5, respectively. Placing the control and measuring and regulating the vacuum devices at the mouth of each reservoir well 5 and 5 in chambers 4 allows you to control the performance of the reported group of wells and the gas concentration in the captured mixture, as well as rationally distribute the vacuum in the degassing system. The productive ones are Squake 6, 7 and 8, operating in the discharge zone near the clearing site 14. The productivity of these wells is not limited. The performance of wells b, 7 and 8, which operate on a previously worked and previously degassed field, is limited in order to reduce mine air inflow. The same restriction also applies to groups of wells operating in the unloaded zone in the extracted field in the area of the developed space 15. With abundant gas production from the previously developed floor 16, the production wall 2 is sprayed with a material that reduces the permeability of the strip 17. on high gas abundance mines contributes to the preservation of high vacuum in the underground drainage network and, as a result, increases the manufacturer awn degasification wells. Formula of the Invention The method of complex degassing of mine fields, based on gas suction from reservoirs, including drilling wells on closely spaced reservoirs, reservoir wells on excavation fields, which are connected to the main gas pipeline on the outlined field and on the other to wellheads closely spaced layers in the area of the floor to be removed, and