CN101435315A

CN101435315A - Method for positioning annular framework type sieve tube segment

Info

Publication number: CN101435315A
Application number: CNA2008102293849A
Authority: CN
Inventors: 付春延; 颜明友; 李作臣; 张忠华; 郑继伟; 汪利; 詹良; 张泽贵; 张剑; 沈旭
Original assignee: Liaohe Petroleum Exploration Bureau
Current assignee: Liaohe Petroleum Exploration Bureau
Priority date: 2008-12-08
Filing date: 2008-12-08
Publication date: 2009-05-20

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

Method for positioning annular framework type sieve tube segment

Technical field:

The present invention relates to a kind of drilling well of non-reagent ground dipping uranium extracting process well, the method for positioning annular framework type sieve tube segment that completion is used.

Background technology:

Traditional following time of well screen section lower going-into-well, just according to implantation site under the single length of pipeline cumulative calculation, uncontrollable error because of generations such as hole deviation, bendings, often cause sieve tube segment and ore bed to misplace, can not guarantee that the well screen section is accurately down to the ore bed position, reduce effective water stream channel area, be unfavorable for improving coefficient of mining.

Summary of the invention:

The purpose of this invention is to provide a kind of method for positioning annular framework type sieve tube segment, this method has solved the screen casing that exists in the prior art and has gone into the well just according to the individual tubes line length cumulative calculation position of going into the well, the uncontrollable error that produces because of hole deviation, bending can not guarantee that uranium well sieve tube segment is accurately down to the problem of ore bed position.

The technical solution adopted for the present invention to solve the technical problems: method for positioning annular framework type sieve tube segment is: hypomere is with 3 iron hoops with diameter 2-6mm respectively on uranium well annular framework type sieve tube.Determine the ore bed position according to log again, calculate the tram of sieve tube segment, the circular hole that 4-8 arranges staggered diameter 12-14mm is bored in the relevant position on sleeve pipe, pitch-row is 6-8cm, outside the sleeve pipe circular hole annular framework type sieve tube is housed, the upper and lower side edge of screen casing is with the iron hoop of 3 diameter 3-6mm respectively; Because adopt the magnetic orientation technology, the applied metal iron hoop can accurately be measured the sieve tube segment position, can compare with the ore bed position that well logging is determined, error is arranged so that in time adjust, can guarantee that sieve tube segment and ore bed position are consistent.Sleeve pipe is the PVC sleeve pipe.

The invention has the beneficial effects as follows that this method is simple, and is easy to operate, accurate positioning; Adopt the process well of this method, the cycle of operation is long, helps to improve recovery ratio, and this positioner has centralizing function.

Description of drawings:

Accompanying drawing is an annular framework type sieve tube positioner schematic diagram of the present invention.

Among the figure 1, sleeve pipe, 2, screen casing upper end iron hoop, 3, annular framework type sieve tube, 4, screen casing lower end iron hoop.

The specific embodiment:

Method for positioning annular framework type sieve tube segment is realized by the annular framework type sieve tube positioner, in the accompanying drawings, this device is by sleeve pipe 1, screen casing upper end iron hoop 2, annular framework type sieve tube 3, screen casing lower end iron hoop 4 is formed: according to log, determine the ore bed position, calculate the tram of sieve tube segment, then determine the length of sieve tube segment; The circular hole that 4-8 arranges staggered diameter 12-14mm is bored in relevant position at sleeve pipe 1, pitch-row is 6-8cm, the annular framework type sieve tube made from pvc pipe 3 is housed outside sleeve pipe 1 circular hole, the screen casing upper end iron hoop 2 that it is 3-6mm that the upper end-face edge of this screen casing 3 is with 3 diameters, the lower edge of this screen casing 3 is with the screen casing lower end iron hoop 4 of 3 same diameters; Annular framework type sieve tube 3 is annulus of being made by the PVC material of annular bar or pipe bottom band small boss, ring tube or bar diameter are 0.5-1.0mm, the high 0.8-1.1mm of boss, each is equipped with 4-6 boss, according to seam thickness design PVC annular framework type sieve tube, the diameter of ring is determined by casing diameter; Owing to be provided with iron hoop at the screen casing upper and lower end, adopt the magnetic orientation technology can accurately measure the sieve tube segment position.

Claims

1, a kind of method for positioning annular framework type sieve tube segment, this method realizes by the annular framework type sieve tube positioner, this device is by sleeve pipe (1), screen casing upper end iron hoop (2), annular framework type sieve tube (3), screen casing lower end iron hoop (4) is formed, it is characterized in that: according to log, determine the ore bed position, calculate the tram of sieve tube segment, then determine the length of sieve tube segment; The circular hole that 4-8 arranges staggered diameter 12-14mm is bored in relevant position at sleeve pipe (1), pitch-row is 6-8cm, the annular framework type sieve tube made from pvc pipe (3) is housed outside sleeve pipe (1) circular hole, the upper end of this screen casing (3) is with the screen casing upper end iron hoop (2) of 3 diameter 3-6mm, and the lower end of this screen casing (3) is with the screen casing lower end iron hoop (4) of 3 same diameters; Annular framework type sieve tube (3) is the annulus of being made by the PVC material of annular bar or pipe bottom band small boss, ring tube or bar diameter are 0.5-1.0mm, the high 0.8-1.1mm of boss, each is equipped with 4-6 boss, according to seam thickness design PVC annular framework type sieve tube, the diameter of ring is determined by casing diameter; Owing to be provided with iron hoop at the screen casing upper and lower end, adopt the magnetic orientation technology can accurately measure the sieve tube segment position.