Features of the application of a polymer casing in the constructon of production wells in underground leaching of uranium

A borehole underground leaching enterprise in the Khiagda ore body leads to the uranium mining at a depth of 90 - 300 m below the permafrost distribution zone. At the same time, HDPE (high density polyethylene) pipes have been widely used in borehole underground leaching uranium deposits, which are currently being replaced by pipes from modified UPVC (unplasticized polyvinyl chloride), in order to reduce the accident rate of technological wells in the geocryolgical conditions of their construction and operation. A comparative analysis of the state of the HDPE and UPVC pipes, under these conditions, made it possible to assess the effect on the strength characteristics of wells by temperature and the duration of their use as casing strings of technological wells; and thereby to proves convincingly the need for the transition to the UPVC pipes of a threaded connection with preliminary application of the appropriate sealants on it. The description of these sealants has been given in the paper. And also its comparison allows to indicate the need of using the technical devices proposed by the authors in the form of metal protective couplings for threaded connections , pipe wrenches, special clamps, etc., allowing to reduce generally accidents during the construction and operation of technological wells in the conditions of permafrost zone to 2,5%.

1. Arsentyev Yu. A., Nazarov A. P., Zabaykin V., Ivanov A. G., On the calculation of production casing of polymeric materials for the permafrost conditions. Actual problems and prospects of economic development: Russian and foreign experience, Scientific review, Issue № 21. M., OPTIMUS, 2019, pp. 2-32.

2. Geotechnology uranium (Russian experience). Ed. I.N. Solodova, E.N. Kamneva. M., University Publ., 2017, 576 p.

3. Zubarev A.B. g Working conditions, grounding design and applications engineering plastic casin for anchoring technology wells underground leaching of metals, Moskow, 1983, 24 p.

4. Ivanov, A.G., Solodov I.N. About choosing the material casing wells equipment for in-situ leaching. Book of abstracts of XIV International scientific-practical Conference «New ideas in the Earth Sciences», М., 2019, pp. 249-250.

5. Ivanov, A.G., Solodov I.N. МateriaI casing wells equipment for in-situ leaching. Mountain magazine, 2018, no 7, pp. 81-85.

6. Ivanov, A.G., Kravtsov V.A., KostinV.A., Yezhov A.P. Recovery Experience tightness technology wells at DC. Technical progress in the nuclear industry, a series ofmining-metallurgical production, 1989, no 6, pp. 17-19.

7. Sergienko I.A., Mosev A.F., Bochco E.A., Pimenov M.K. Out geotechnical equipment and Drilling wells. M., Nedra Publ., 1984, 224 p.

8. Solodov I.N., Gladyshev A.V., Ivanov A.G. Experience mining of uranium in-situ leaching method in kriolitozone. Exploration and protection of the subsoil, 2018, no 11, pp. 65-70.