CN203808948U

CN203808948U - Anti-blocking filter screen tube special for drainage of coal-bed gas wells

Info

Publication number: CN203808948U
Application number: CN201420099582.9U
Authority: CN
Inventors: 叶姜; 杨世梁; 邓鸢; 刘勇; 何坤雄
Original assignee: Guizhou Pan Jiang Cbm Development Utilizes Co Ltd
Current assignee: Guizhou Pan Jiang Cbm Development Utilizes Co Ltd
Priority date: 2014-03-06
Filing date: 2014-03-06
Publication date: 2014-09-03
Anticipated expiration: 2024-03-06

Abstract

The utility model belongs to the technical field of filter screen tubes for drainage of coal-bed gas wells, and particularly relates to an anti-blocking filter screen tube special for drainage of the coal-bed gas wells. The anti-blocking filter screen tube is characterized in that a drain assembly, an oil tube, an expansion joint assembly and a screen tube assembly are connected from top to bottom sequentially, and a PE tube is disposed in the oil tube. The anti-blocking filter screen tube is simple in structure and high in reliability. Blocking of the screen tube can be prevented effectively, continuous and stable drainage work of the coal-bed gas wells can be guaranteed, well-operation stopping and pump inspecting caused by blocking of the coal-bed gas wells due to pulverized coal are avoided, and accordingly cost is lowered effectively while work efficiency is improved.

Description

The special block-proof type filter sieve tube of a kind of coal bed gas well mining

Technical field

The utility model belongs to coal bed gas well mining filter sieve tube technical field, is specifically related to the special block-proof type filter sieve tube of a kind of coal bed gas well mining.

Background technology

The filter sieve tube that current coal bed gas extraction uses, as the water inlet entrance of suction pump, all generally that metal screen is wrapped in and on screen casing, carries out draining, once but there is coal dust in water in mining process, coal dust extremely easily sticks on filter screen, affect the efficiency of drawing water, when serious, can cause filter net jam, surface pump is taken out not water outlet, once simultaneously this situation occurs, need to stop production and examine pump, not only expend certain human and material resources and time, also can bring certain reservoir damage to coal bed gas well, affect coal bed gas gas output per well.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, provides a kind of simple in structure, the special block-proof type filter sieve tube of coal bed gas well mining of high efficient and reliable.

The utility model solves the technical scheme that its technical problem adopts: the special block-proof type filter sieve tube of a kind of coal bed gas well mining, comprise the assembly 1 that draws water, oil pipe 2, PE pipe 3, expansion joint assembly 4 and screen casing assembly 5, it is characterized in that, draw water assembly 1, oil pipe 2, expansion joint assembly 4 and screen casing assembly 5 is from top to bottom connected successively, and PE pipe 3 is positioned at oil pipe 2.

Particularly, described expansion joint assembly 4 is made up of tubing nipple 41, plastic telescopic pipe 43, spring 44 and capping 45, tubing nipple 41 and oil pipe 2 are with screwed connection, plastic telescopic pipe 43 is positioned at tubing nipple 41, the bottom of plastic telescopic pipe 43 is provided with a spring 44, and spring 44 is provided with a capping 45 below, and plastic telescopic pipe 43 tops are provided with an annular box cupling 42, capping 45 is with tubing nipple 41 lower ends with screwed connection, and the external diameter of annular box cupling 42 is greater than the internal diameter of capping 45.

Particularly, described screen casing assembly 5 is made up of rubber screen casing 51 and spring steel screen cloth 52, and screen casing has respectively joint in two ends Shang Xia 51, and spring steel screen cloth 52 is wrapped in rubber screen casing 51 outer wall upper ends, the 52 unsettled placements in lower end of spring steel screen cloth.

Particularly, described oil pipe 2 be positioned at draw water assembly 1 lower end and with it with screwed connection, the valve seat bottom that PE manages 3 upper ends and the assembly 1 that draws water contacts, and external diameter equates with oil pipe 2 internal diameters.

The beneficial effects of the utility model are that simple in structure, reliability is high, can effectively prevent that screen casing from stopping up, guarantee the draining that coal bed gas well is continual and steady, prevent that coal bed gas well from stopping well pump detection and workover because coal dust stops up, thereby effectively reduce costs, increase work efficiency.

Below in conjunction with drawings and Examples, the utility model is described in further detail.

Brief description of the drawings

Fig. 1 is the typical structure schematic diagram of the special block-proof type filter sieve tube of a kind of coal bed gas well mining of the utility model;

Fig. 2 is the structural representation of oil pipe and PE pipe in the utility model;

Fig. 3 is the structural representation of expansion joint assembly in the utility model;

Fig. 4 is the structural representation of screen casing assembly in the utility model.

In figure:

1, the assembly that draws water, 2, oil pipe, 3, PE pipe, 4, expansion joint assembly, 5, screen casing assembly, 41, tubing nipple, 42, annular box cupling, 43, plastic telescopic pipe, 44, spring, 45, capping, 51, rubber screen casing, 52, spring steel screen cloth.

Detailed description of the invention

Referring to Fig. 1～Fig. 4, the special block-proof type filter sieve tube of a kind of coal bed gas well mining the utility model proposes, comprise the assembly 1 that draws water, oil pipe 2, PE pipe 3, expansion joint assembly 4 and screen casing assembly 5, it is characterized in that, draw water assembly 1, oil pipe 2, expansion joint assembly 4 and screen casing assembly 5 is from top to bottom connected successively, and PE pipe 3 is positioned at oil pipe 2.

Particularly, described expansion joint assembly 4 is made up of tubing nipple 41, plastic telescopic pipe 43, spring 44 and capping 45, tubing nipple 41 and oil pipe 2 are with screwed connection, plastic telescopic pipe 43 is positioned at tubing nipple 41, the bottom of plastic telescopic pipe 43 is provided with a spring 44, spring 44 is provided with a capping 45 below, plastic telescopic pipe 43 tops are provided with an annular box cupling 42, capping 45 and tubing nipple 41 lower ends are with screwed connection, for supporting spring 44 and the plastic telescopic pipe 43 on it, the external diameter of annular box cupling 42 is greater than the internal diameter of capping 45.

Particularly, described screen casing assembly 5 is made up of rubber screen casing 51 and spring steel screen cloth 52, and screen casing has respectively joint in two ends Shang Xia 51, and spring steel screen cloth 52 is wrapped in rubber screen casing 51 outer wall upper ends, the 52 unsettled placements in lower end of spring steel screen cloth, spring steel screen cloth 52 is 30 object screen clothes.

De-plugging principle: after coal bed gas well mining a period of time, in the time occurring that screen cloth obstruction causes pump to take out the situation of not water outlet, push successively PE pipe 3 and the plastic telescopic pipe 43 under it by transferring the plunger of the assembly 1 that draws water, when plastic telescopic pipe 43 drops to after certain distance, on carry plunger and make rubber screen casing 51 and spring steel screen cloth 52 vertical tremor repeatedly under it, by crimp repeatedly and the vibrations of the aperture in rubber screen casing 51 and spring steel screen cloth 52, coal dust in aperture on screen casing 51 and steel screen cloth 52 is extruded, finally reached the effect of de-plugging.

Claims

1. the special block-proof type filter sieve tube of coal bed gas well mining, comprise that the assembly that draws water (1), oil pipe (2), PE manage (3), expansion joint assembly (4) and screen casing assembly (5), it is characterized in that, draw water assembly (1), oil pipe (2), expansion joint assembly (4) and screen casing assembly (5) is from top to bottom connected successively, and PE pipe (3) is positioned at oil pipe (2).

2. the special block-proof type filter sieve tube of a kind of coal bed gas well mining according to claim 1, it is characterized in that, described expansion joint assembly (4) is by tubing nipple (41), plastic telescopic pipe (43), spring (44) and capping (45) composition, tubing nipple (41) and oil pipe (2) are with screwed connection, plastic telescopic pipe (43) is positioned at tubing nipple (41), the bottom of plastic telescopic pipe (43) is provided with a spring (44), spring (44) is provided with a capping (45) below, plastic telescopic pipe (43) top is provided with an annular box cupling (42), capping (45) and tubing nipple (41) lower end are with screwed connection, the external diameter of annular box cupling (42) is greater than the internal diameter of capping (45).

3. the special block-proof type filter sieve tube of a kind of coal bed gas well mining according to claim 1 and 2, it is characterized in that, described screen casing assembly (5) is made up of rubber screen casing (51) and spring steel screen cloth (52), there is respectively joint at the upper and lower two ends of screen casing (51), spring steel screen cloth (52) is wrapped in rubber screen casing (51) outer wall upper end, the unsettled placement in spring steel screen cloth (52) lower end.

4. the special block-proof type filter sieve tube of a kind of coal bed gas well mining according to claim 1 and 2, it is characterized in that, described oil pipe (2) be positioned at the assembly that draws water (1) lower end and with it with screwed connection, PE pipe (3) upper end contacts with the valve seat bottom of the assembly that draws water (1), and external diameter equates with oil pipe (2) internal diameter.