Combined type gas well sand removing and filtering device

Abstract

A combined type gas well sand removing and filtering device comprises a first filtering unit and a second filtering unit which are parallel to each other. The first filtering unit comprises a first valve, a first basket filter, a first tubular filter and a second tubular filter, and the second valve is sequentially connected through a pipeline from left to right; the second filtering unit comprises a third valve, and a second basket filter, a third tubular filter, a fourth tubular filter and a fourth valve are sequentially connected through pipelines from left to right. The device has the advantages that a double-loop filter combination is adopted to perform multi-stage filtration on underground impurities, including formation sand, filling sand, solid-phase particles, organic matters, colloidal asphaltene and a foam scrubbing agent, produced in the later period of a natural gas well, so that all-directional blocking and interception are realized, and normal operation of the device is guaranteed; the first filtering unit and the second filtering unit continuously and alternately operate, so that continuous production of the natural gas well is ensured, and the production efficiency of the gas well is improved.

Description

Technical Field

[0001] This invention belongs to the field of gas well product filtration technology, and specifically relates to a combined gas well sand removal and filtration device. Background Technology

[0002] During natural gas well development, fixed filters are typically used to remove impurities from the produced materials. This prevents solid particles from eroding and damaging surface pipelines or equipment, and also prevents gaseous or liquid substances from causing physicochemical corrosion to the surface transportation system. However, current technologies can only filter the produced materials from the early stages of natural gas well production. For the later stages of production, which contain a large number of diverse impurities, existing filtration devices are ineffective. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a combined gas well sand removal and filtration device.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a combined gas well sand removal and filtration device, characterized in that: it includes two parallel filtration units: a first filtration unit and a second filtration unit; the first filtration unit includes a first valve, a first basket filter, a first tubular filter, a second tubular filter, and a second valve; the second filtration unit includes a third valve, a second basket filter, a third tubular filter, a fourth tubular filter, and a fourth valve. The first valve, the first basket filter, the first tubular filter, the second tubular filter, and the second valve are connected in sequence from left to right via pipelines. The third valve, the second basket filter, the third tubular filter, the fourth tubular filter, and the fourth valve are connected in sequence from left to right via pipelines. The first basket filter and the second basket filter may be equipped with a filter screen that can filter out larger particles of impurities, including but not limited to one or more of a reverse-wound wire screen, a self-cleaning wound wire screen, and a self-cleaning screen. The first tubular filter and the third tubular filter may be equipped with a filter screen that can filter out smaller particles of impurities, including but not limited to one or more of a reverse-wound wire screen cylinder, a self-cleaning wound wire cylinder, and a self-cleaning screen cylinder. The second tubular filter may be equipped with a filter screen capable of filtering out fine particulate impurities, including but not limited to one or more of a reverse-wound wire screen cylinder, a self-cleaning wound wire cylinder, and a self-cleaning screen cylinder.

[0005] Preferably, pressure gauges are provided on the first tubular filter, the second tubular filter, the third tubular filter, and the fourth tubular filter.

[0006] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention adopts a multi-combination dual-loop overall design concept, utilizing filter media of different mesh sizes, filter element devices of different structures, and a dual-loop filter combination to perform multi-stage filtration on downhole impurities produced in the later stages of natural gas well production, including formation sand, filling sand, solid particles, organic matter, asphaltene, and foaming agents, to achieve all-round blocking and interception, thus ensuring that the normal operation of the surface treatment equipment is not affected. The first and second filtration units operate alternately continuously, ensuring continuous production of natural gas wells and improving the production efficiency of gas wells. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention. Detailed Implementation

[0008] The present invention will be further described below with reference to the accompanying drawings and embodiments: Example 1 like Figure 1 As shown, a combined gas well sand removal and filtration device includes two parallel filtration units: a first filtration unit and a second filtration unit; the first filtration unit includes a first valve 1, a first basket filter 2, a first tubular filter 3, a second tubular filter 4, and a second valve 5; the second filtration unit includes a third valve 6, a second basket filter 7, a third tubular filter 8, a fourth tubular filter 9, and a fourth valve 10. The first valve 1, the first basket filter 2, the first tubular filter 3, the second tubular filter 4, and the second valve 5 are connected in sequence from left to right. The third valve 6, the second basket filter 7, the third tubular filter 8, the fourth tubular filter 9, and the fourth valve 10 are connected in the following order from left to right; The first basket filter 2 and the second basket filter 7 can be equipped with a filter screen that can filter out larger particles of impurities, including but not limited to one or more of the following: reverse-wound wire screen, self-cleaning wound wire screen, and self-cleaning screen. The first tubular filter 3 and the third tubular filter 8 can be equipped with a filter screen that can filter out smaller particles of impurities, including but not limited to one or more of the following: reverse-wound wire screen cylinder, self-cleaning wound wire cylinder, and self-cleaning screen cylinder. The second tubular filter 4 and the fourth tubular filter 9 may be equipped with a filter screen that can filter out fine particulate impurities, including but not limited to one or more of the following: a reverse-wound wire screen cylinder, a self-cleaning wound wire cylinder, and a self-cleaning screen cylinder.

[0009] Pressure gauges are installed on the first tubular filter 3, the second tubular filter 4, the third tubular filter 8, and the fourth tubular filter 9.

[0010] Working principle of the invention: like Figure 1 As shown, during implementation, the third valve 6 and the fourth valve 10 are first closed, and the first filtration unit begins operation. The first basket filter 2 filters out viscous, large-particle impurities, the first tubular filter 3 filters out medium-grade impurities, and finally, the second tubular filter 4 filters out smaller-particle impurities that have passed through the first two filters before discharge. After operating for a period of time, when the pressure difference measured by the pressure gauges on the first tubular filter 3 and the second tubular filter 4 reaches the specified value of 0.15 MPa, it indicates that the filter elements of the first basket filter 2, the first tubular filter 3, and the second tubular filter 4 in the first filtration unit need to be cleaned and replaced. At this time, the third valve 6 and the fourth valve 10 of the second filtration unit are opened to form a new filtration channel for continued operation. Then, the first valve 1 and the second valve 5 of the first filtration unit are closed, and the filter elements of the first basket filter 2, the first tubular filter 3, and the second tubular filter 4 are replaced and put back into use after being in good condition. In this way, the normal and continuous operation of the invention is ensured. Therefore, the characteristic of this invention is that it operates without interrupting production, ensuring continuous production of the well and improving the production rate of the gas well.

[0011] The filter element material is selected based on the particle size of the gas well output. Different materials and sizes of filter screens are selected, and the appropriate mesh size combination is selected according to the particle distribution. A reasonable production pressure differential is selected so that the filter material can be replaced without stopping production.

[0012] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A combined gas well sand removal and filtration device, characterized in that: It includes two parallel filtration units: a first filtration unit and a second filtration unit; the first filtration unit includes a first valve (1), a first basket filter (2), a first tubular filter (3), a second tubular filter (4), and a second valve (5); the second filtration unit includes a third valve (6), a second basket filter (7), a third tubular filter (8), a fourth tubular filter (9), and a fourth valve (10); The first valve (1), the first basket filter (2), the first tubular filter (3), the second tubular filter (4), and the second valve (5) are connected in sequence from left to right; The third valve (6), the second basket filter (7), the third tubular filter (8), the fourth tubular filter (9), and the fourth valve (10) are connected in sequence from left to right; The first basket filter (2) and the second basket filter (7) may be equipped with a filter screen that can filter out larger particles of impurities, including but not limited to one or more of the following: reverse-wound wire screen, self-cleaning wound wire screen, and self-cleaning screen. The first tubular filter (3) and the third tubular filter (8) may be equipped with a filter screen that can filter out smaller particles of impurities, including but not limited to one or more of a reverse-wound wire screen, a self-cleaning wound wire screen, and a self-cleaning screen. The second tubular filter (4) and the fourth tubular filter (9) may be equipped with a filter screen that can filter out fine particles of impurities, including but not limited to one or more of a reverse-wound wire screen, a self-cleaning wound wire screen, and a self-cleaning screen.

2. The combined gas well desanding and filtration device according to claim 1, characterized in that: Pressure gauges are provided on the first tubular filter (3), the second tubular filter (4), the third tubular filter (8), and the fourth tubular filter (9).

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