CN212027755U - Sand-proof coal powder-blocking-control screen pipe for coal-bed gas well - Google Patents

Abstract

The utility model discloses a coal bed gas well sand control accuse buggy jam screen pipe. It includes: one end of the perforated sieve pipe is connected with the pump body through a first coupling, and the perforated sieve pipe is provided with spirally distributed filter holes; one end of the slotted sieve tube is connected with the other end of the perforated sieve tube through a second coupling, and the slotted sieve tube is provided with filtering slots which are arranged in a parallel and staggered manner; one end of the wire-wound screen pipe is connected with the other end of the slotted screen pipe through a third coupling, and the wire-wound screen pipe is provided with a filtering gap; and the plug is arranged at the other end of the wire-wrapped screen pipe. The coal bed gas well sand control pulverized coal blockage control sieve tube adopts three combined sieve tubes with excellent performance, so that the occurrence of sieve tube blockage is reduced to the maximum extent, the normal drainage and production of the coal bed gas well are ensured, the influence of produced pulverized coal on the drainage and production of the coal bed gas well is reduced, the pump detection period of the coal bed gas well is prolonged, and the aims of reducing cost and improving efficiency of the drainage and production of the coal bed gas are fulfilled.

Description

Sand-proof coal powder-blocking-control screen pipe for coal-bed gas well

Technical Field

The utility model relates to a buggy field is prevented in coal seam gas well sand control, especially about a coal seam gas well sand control buggy blocks up screen pipe.

Background

In the coal bed gas exploitation process, a large amount of sand grains with uneven particle size distribution can be produced and accumulated, and by referring to the development experience of oil and gas fields, most coal bed gas wells adopt sand control screen pipes to solve the problem of coal powder production in the sand production of the coal bed gas wells. At present, the common underground screen pipe of the coal bed gas well mainly comprises a wire-wound screen pipe, a slotted screen pipe and a perforated screen pipe.

The wire-wrapped screen pipe has the advantages of high strength, large flow, good corrosion prevention effect and the like, and is widely applied, but for coal-bed gas wells, the variation of the particle range of the coal powder is large, the general aperture gap size of the wire-wrapped screen pipe can reach 0.01-3.0mm, and the coal powder below the aperture gap size can block the screen pipe, so that the liquid supply capacity of the coal-bed gas wells is influenced. The slotted screen pipe is characterized in that a fine slot is cut on the casing pipe or the oil pipe body, and the formation sand is blocked outside the screen pipe to realize sand prevention, so that the slotted screen pipe has a simple structure and low cost; the common sand control particle size can reach more than 0.20mm, and the coal dust control effect of the coal-bed gas well with coal dust discharged from small particles is poor. The number of the perforated sieve tube holes is adjustable, the whole processing technology is simple, the strength is high, and the perforated sieve tube is not easy to deform; however, the diameter of the hole is larger and can generally reach about 5-10mm, the effect is better when the sieve tube is used in a stratum with less sand production, and if more coal powder is produced during sand production, the sand blocking effect of the sieve tube is lost, and a large amount of stratum sand is produced, so that the sand control fails. In a word, the traditional screen pipe has single particle size of the sand-preventing and coal dust-preventing powder, and the particle size selection is difficult to be considered, so that the screen pipe is blocked by the coal dust or the sand can not be produced in the stratum.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a coal bed gas well sand control coal dust of simple structure is controlled and is blockked up screen pipe, its furthest's reduction screen pipe blocks up and takes place, and the normal row of guarantee coal bed gas well is adopted, has reduced the influence that the buggy was extracted to coal bed gas well row, and extension coal bed gas well pump checking cycle reaches the purpose that coal bed gas row adopted cost reduction increase.

In order to achieve the above object, the utility model provides a coal seam gas well sand control buggy blocks up screen pipe, include: one end of the perforated sieve pipe is connected with the pump body through a first coupling, and the perforated sieve pipe is provided with spirally distributed filter holes; one end of the slotted sieve tube is connected with the other end of the perforated sieve tube through a second coupling, and the slotted sieve tube is provided with filtering slots which are arranged in a parallel and staggered manner; one end of the wire-wound screen pipe is connected with the other end of the slotted screen pipe through a third coupling, and the wire-wound screen pipe is provided with a filtering gap; and the plug is arranged at the other end of the wire-wrapped screen pipe.

In a preferred embodiment, the aperture of the filtering holes is 5mm, the phase of the holes is 60 degrees, and the distance between the holes is 40 mm; the outer diameter of the perforated sieve tube is phi 73mm, the inner diameter of the perforated sieve tube is phi 62mm, and the length of the perforated sieve tube is 1 m.

In a preferred embodiment, the filter slots are 0.1mm wide, 100mm long, 200mm apart, and the slotted screen has an outer diameter of phi 73mm, an inner diameter of phi 62mm, and a length of 1 m.

In a preferred embodiment, the filter slot has a width of 0.02mm, and the wire-wrapped screen has an outer diameter of phi 73mm, an inner diameter of phi 62mm, and a length of 2 m.

In a preferred embodiment, the wire-wrapped screen is a fully welded wire-wrapped screen.

Compared with the prior art, according to the utility model discloses a coal bed gas well sand control buggy blocks up screen pipe has following beneficial effect: the coal bed gas well sand control and coal powder blockage control sieve tube adopts three combined sieve tubes with excellent performance, improves the reliability of sand control and coal powder control through different control particle sizes of the sieve tubes, simultaneously reduces the occurrence of sieve tube blockage to the maximum extent, ensures normal drainage of the coal bed gas well, reduces the influence of sand output coal powder on the drainage of the coal bed gas well, prolongs the pump detection period of the coal bed gas well, and achieves the purposes of reducing cost and improving efficiency of the drainage of the coal bed gas.

Drawings

Fig. 1 is a schematic structural diagram of a coal bed gas well sand control pulverized coal plugging screen pipe according to an embodiment of the present invention.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

The coal-bed gas well sand control and coal powder control method has three main ways: the method comprises the steps of stratum prevention and control, shaft prevention and control and third step of taking certain measures to ensure that sand grains and coal powder entering a pump can be discharged out of a pump cylinder and a shaft. After the coal bed gas is pumped into the well, the sand control coal dust blockage sieve tube of the coal bed gas well needs to be installed at the lower part of the pump body.

As shown in fig. 1, the concrete structure of the coal bed gas well sand control pulverized coal plugging screen pipe according to the preferred embodiment of the present invention comprises: the perforated sieve tube 2, the slotted sieve tube 4, the wire-wrapped sieve tube 6 and the plug 7, the plug 7 is positioned at the bottom of the coal bed gas well sand control coal dust blocking sieve tube, the wire-wrapped sieve tube 6, the slotted sieve tube 4 and the perforated sieve tube 2 are connected to the upper part of the plug 7 through a coupling, the wire-wrapped sieve tube limits formation sand with certain particle size outside the sieve tube by an outer layer sand blocking wire-wrapped filter layer, and can prevent sand grains and coal dust larger than 0.02mm from entering the tube; the slotted sieve tube in the middle part blocks large-particle coal powder or sand grains outside the slotted sieve tube, and particles larger than 0.1mm cannot enter a shaft through the sieve tube; the aperture of the perforated sieve tube at the upper part is 5 mm. According to the formula 1, because the sand grains and the coal dust are distributed in the shaft in a layered manner, under the condition of a certain extraction speed, the large-particle coal dust and the sand grains are more easily settled in the shaft, and the small-particle coal dust and the small-particle sand grains are suspended on the large-particle coal dust and the small-particle sand grains, finally, the smaller coal dust is produced out of the well through the perforated sieve tube along with the fluid in the shaft. The three combined sieve tubes with excellent performance are adopted, the reliability of the sand control and coal powder control is improved through different control particle sizes of the sieve tubes, meanwhile, the sieve tube blockage is reduced to the maximum extent, the normal drainage and production of the coal bed gas well are guaranteed, and the pump detection period of the coal bed gas well is prolonged.

Specifically, one end of the perforated sieve tube 2 is connected with the pump body through a first coupling 1, and filter holes which are distributed spirally are formed in the perforated sieve tube, so that the small-particle coal dust and coal slime can not block the sieve tube blocked by the coal bed gas well sand control coal dust.

In one embodiment, the aperture of the filter holes is 5mm, the phase of the holes is 60 degrees, and the distance between the holes is 40 mm. The perforated sieve tube 2 has an outer diameter of phi 73mm, an inner diameter of phi 62mm and a length of 1 m.

One end of the slotted screen pipe 4 is connected with the other end of the perforated screen pipe 2 through a second coupling 3, and the slotted screen pipe is provided with filtering slots which are arranged in a parallel and staggered manner, so that formation sand is blocked outside the screen pipe blocked by the sand control coal dust of the coal bed gas well to realize sand control.

In one embodiment, the width of the filtering slot is 0.1mm, the length of the filtering slot is 100mm, the distance between the filtering slots is 200mm, the outer diameter of the slotted screen pipe is phi 73mm, the inner diameter of the slotted screen pipe is phi 62mm, and the length of the slotted screen pipe is 1m, so that construction operation is facilitated, particles larger than 0.1mm cannot enter a shaft through the coal-bed gas well sand control coal dust blocking screen pipe, the overall strength of the screen pipe is high, and the sand control and coal particle prevention effects are good.

One end of the wire-wound sieve tube 6 is connected with the other end of the slotted sieve tube 4 through a third coupling 5, and the wire-wound sieve tube has a filtering gap, so that formation sand with a certain particle size can be limited outside the sieve tube by an outer sand-blocking wire-wound filtering layer.

In one embodiment, the width of the filter gap is 0.02mm, the outer diameter of the wire-wrapped screen 6 is phi 73mm, the inner diameter is phi 62mm, and the length is 2m, so that sand grains and coal dust larger than 0.02mm can be prevented from entering the pipe.

In one embodiment, the wire-wrapped screen 6 is a full-welded wire-wrapped screen.

The plug 7 is arranged at the other end of the wire-wrapped screen pipe 6 and aims to prevent sand and coal dust from directly entering the screen pipe.

In conclusion, the coal bed gas well sand control and coal powder blockage control sieve tube adopts three combined sieve tubes with excellent performance, the reliability of sand control and coal powder control is improved through different control particle sizes of the sieve tubes, meanwhile, the occurrence of sieve tube blockage is reduced to the maximum extent, the normal drainage and production of the coal bed gas well are ensured, the influence of sand production and coal powder production on the drainage and production of the coal bed gas well is reduced, the pump detection period of the coal bed gas well is prolonged, and the purposes of reducing the cost and improving the efficiency of the drainage and production of the coal bed gas are.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (5)

1. The utility model provides a coal bed gas well sand control coal dust blocks up screen pipe which characterized in that includes:

one end of the perforated sieve pipe is connected with the pump body through a first coupling, and the perforated sieve pipe is provided with spirally distributed filter holes;

one end of the slotted sieve tube is connected with the other end of the perforated sieve tube through a second coupling, and the slotted sieve tube is provided with filtering slots which are arranged in a parallel and staggered manner;

one end of the wire-wound screen pipe is connected with the other end of the slotted screen pipe through a third coupling, and the wire-wound screen pipe is provided with a filtering gap; and

and the plug is arranged at the other end of the wire-wrapped screen pipe.

2. The coal-bed gas well sand control coal dust plugging sieve tube as claimed in claim 1, wherein the aperture of the filter hole is 5mm, the phase of the holes is 60 degrees, and the distance between the holes is 40 mm; the outer diameter of the perforated sieve tube is phi 73mm, the inner diameter of the perforated sieve tube is phi 62mm, and the length of the perforated sieve tube is 1 m.

3. The coal-bed gas well sand control coal dust plugging screen pipe as claimed in claim 1, wherein the width of the filtering slot is 0.1mm, the length is 100mm, the distance is 200mm, the outer diameter of the slot screen pipe is phi 73mm, the inner diameter is phi 62mm, and the length is 1 m.

4. The coal-bed gas well sand control coal dust plugging screen pipe as claimed in claim 1, wherein the width of the filtering gap is 0.02mm, the outer diameter of the wire-wrapped screen pipe is phi 73mm, the inner diameter is phi 62mm, and the length is 2 m.

5. The coal bed gas well sand control coal dust plugging screen of claim 1, wherein the wire-wrapped screen is a fully welded wire-wrapped screen.

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