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

Abstract

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%.

Keywords

• скважина
• скважинное подземное выщелачивание
• полимерные обсадные трубы
• резьбовые соединения
• герметики