Method for positioning annular framework type sieve tube segment

Abstract

The invention discloses a positioning method of a ring-shaped skeleton sieve tube segment used in well drilling and completion of a reagent-free in-situ leaching uranium mining technology well. The method is realized by a ring-shaped skeleton sieve tube positioning device which consists of a casing, an iron hoop at the upper end of a sieve tube, the ring-shaped skeleton sieve tube and an iron hoop at the lower end of the sieve tube, and the ring-shaped skeleton sieve tube is made by PVC tubes; the ore bed position is determined by a borehole log, 4 to 8 rows of circular holes arranged in a staggered way are drilled at the corresponding positions on the casing, the ring-shaped skeleton sieve tube is arranged outside the casing, and the upper end and the lower end of the sieve tube are respectively sheathed with 3 iron hoops; and the ring-shaped skeleton sieve tube is composed of a ring-shaped tube or a ring-shaped strip of which the lower part is provided with a lug boss. As the sieve tube is provided with the iron hoops, the sieve tube segment position can be accurately detected by a magnetic orientation technology. The method solves the problems in the prior art that the descent of sieve tubes is calculated according to the accumulated length of single pipelines, the errors caused by the bending of deviated hole can not be avoided, and placing of the sieve tubes to the ore bed position can not be guaranteed. The method can be widely used in the well drilling and completion operation of the reagent-free in-situ leaching uranium mining technology well.

Description

Technical field: [0001] The invention relates to a positioning method for an annular frame type screen section used for drilling and completing wells of a reagent-free in-ground leaching uranium production process well. Background technique: [0002] When the traditional oil well screen section is run downhole, the running position is only calculated according to the length of a single pipeline, which cannot control the errors caused by well deviation, bending, etc., often causing misalignment between the screen section and the ore layer, and cannot ensure that the oil well screen section is accurately lowered. The location of the ore seam reduces the effective water flow channel area, which is not conducive to improving the mining rate. Invention content: [0003] The purpose of the present invention is to provide a positioning method for the ring-frame type screen section, which solves the problem that the existing technology of the screen pipe running into the well only...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a positioning method for the annular skeleton type screen section, which solves the problem that the existing technology of the screen pipe running into the well is only calculated according to the length of a single pipeline, and it is impossible to control the occurrence of well deviation and bending. The error cannot ensure that the screen section of the uranium well is accurately lowered to the position of the ore seam

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