RU2301881C1 - Filtering well construction rig - Google Patents

Abstract

FIELD: mining, particularly equipment to construct wells for water or other fluid production, particularly for well completion during well drilling or repair to prevent sand production.

SUBSTANCE: filtering well construction rig comprises production and filtering string, double flushing string. The device also has additional double flushing string having lower end installed in annular space between production string and filtering one so that the lower end may slide within 4-6 m range with respect to filtering string end. The filtering string has shell-type filter.

EFFECT: optimization of natural filter formation process.

1 dwg

Description

The present invention relates to the field of mining, in particular to devices for constructing wells for the extraction of water and other fluid, and can be used for pumping wells during drilling or repair to combat sand removal.

A well-known tool for the construction of wells, including production and filter columns with a casing filter [1].

A disadvantage of the known tool is the washing of the filter zone of the well through the production string, which does not provide reliable formation of a natural filter and leads to contamination of the casing filter.

A well-known tool for constructing a filter well, including production, filter columns, duct for airlift flushing of the annular cavity [2].

A disadvantage of the known tool is the low efficiency of the annular airlift washing.

Closest to the claimed invention is a tool for constructing a filter well, including production, filter columns and a double wash pipe [3].

A disadvantage of the known tool is the washing of the filter zone of the well through the column, which does not allow the use of a casing filter.

The objective of the present invention is to ensure the optimal formation of a natural filter.

The problem is solved in that the tool, including production, filter columns, a double washing pipe, is equipped with an additional double washing pipe installed by the lower part in the annular cavity between the production and filter columns with the possibility of movement relative to the end of the filter column within 4-6 m, and the filter column is equipped with a casing filter.

The invention is illustrated in the drawing. The tool includes production 1, filter 2 columns, double wash pipe 3, additional double wash pipe 4. Filter column 2 is equipped with a filter 5 and a blind part 6 connected to the double wash pipe 3 by the left sub 7.

The tool consists in the fact that after the descent of the filter column 2 into the well on a double washing pipe 3, an additional double washing pipe 4 is lowered and its lower part is installed in the annular cavity between the production and filter columns 2 by 4-6 m, the supply of washing liquid to double pipe 3 and air into an additional double washing pipe 4.

The washed clay and dust particles are pumped out of the annular cavity by airlift, while medium and coarse rock particles 8 are deposited on the face where a natural filter is formed.

The process of filling the annular cavity with particles 8 is accompanied by pacing the lower part of the additional double flushing pipe.

After filling the annular cavity, the flow of flushing fluid and air is turned off, and an additional double flushing tube 4 is removed from the well.

After that, the air supply to the second wash pipe 3 for airlift pumping is turned on, after which the second wash pipe 3 is removed from the well.

Information sources

1. USSR author's certificate No. 1191562, MKI4 Е21В 43/08, 11/15/1985.

2. USSR author's certificate No. 914754, MKI2 E21B 43/08, 03/23/1982.

3. RF patent №2209943, IPC7 ЕВВ 43/04, 08/10/2003.

Claims (1)

A tool for constructing a filter well, including production, filter columns, double flush pipe, characterized in that it is equipped with an additional double flush pipe installed at the bottom in the annular cavity between the production and filter columns with the possibility of movement relative to the end of the filter column within 4-6 m and the filter column is equipped with a casing filter.