Metering and separating integrated device for coal-bed gas well site

Abstract

The utility model discloses a metering and separating integrated device for a coal-bed gas well site. The device comprises a plurality of inlet end precession vortex type flow meters used for single well metering and a gas-liquid separator, the inlet end precession vortex type flow meters are connected with the gas-liquid separator through an inlet manifold, the gas-liquid separator is provided with a gas phase outlet pipeline and a liquid drainage pipeline, the gas phase outlet pipeline is provided with an outlet end precession vortex flow meter, and the liquid drainage pipeline is provided with a liquid drainage pipeline. A liquid level meter is arranged on the gas-liquid separator, an electric liquid level adjusting valve interlocked with the liquid level meter is arranged on the liquid discharging pipeline, and the tail end of the liquid discharging pipeline is connected with a produced water gathering pipe on a well site. The system has the advantages that the problems that high-yield coal-bed gas well site equipment is scattered, the construction period is long and the like are effectively solved, automatic management is achieved, the condition that no fixed personnel are on duty is achieved, therefore, the personnel inspection difficulty is solved, a user can monitor the well site production condition easily, and the system has the advantages of being modularized, small, convenient to transport, rapid to install and flexible to move.

Description

Technical Field

[0001] The utility model relates to a metering and separation device for separating gas and water produced from a coalbed methane wellhead and metering the gas phase, in particular to a metering and separation integrated device for a coalbed methane well site. Background Art

[0002] At present, the production technology of coalbed methane wells in my country is to produce water through oil pipes. The water enters the production water pool at the well site or is transported through a newly built production water pipeline. The water content in the casing produced gas is relatively low. Generally, water is not separated at the well site. Instead, a gas-liquid mixture is transported to the gas gathering station for gas-liquid two-phase separation.

[0003] With the development of coalbed methane in my country, coalbed methane fields with various reservoir properties have shown high water content, which requires water distribution at the well site. At present, high-yield water well sites in coalbed methane fields generally adopt single wellhead water distribution and gas-liquid separators at the well site. These methods all have problems such as dispersed equipment, low water distribution efficiency and large footprint.

[0004] At present, all major domestic oil and gas fields are promoting intensive integrated equipment. Integrated equipment occupies a small area and is easy to manage. It has become a new direction for surface construction of oil and gas fields. Due to the large number of well sites and the difficulty of inspection, each gas field has gradually adopted skid-mounted well site main process functions to achieve intelligent management. For example, Linxing tight gas field and Shenfu tight gas field both use well site metering skids to achieve metering functions of cluster well sites.

[0005] However, currently well site metering and gas-liquid separation are mostly arranged separately, resulting in problems such as scattered equipment in high-yield coalbed methane well sites, large land area, and long construction period. Summary of the invention

[0006] The technical problem to be solved by the utility model is to provide a metering and separation integrated device for coalbed methane well sites that can optimize the gathering and transportation process, integrate equipment intensively and simultaneously meet the needs of metering and separation, and effectively solve the land use problem.

[0007] In order to solve the above technical problems, the utility model is a metering and separation integrated device for coalbed methane well sites, including multiple inlet vortex flowmeters and gas-liquid separators for single well metering. Each inlet vortex flowmeter is connected to the gas-liquid separator through an inlet manifold. The gas-liquid separator has a gas phase outlet pipeline and a drainage pipeline. The gas phase outlet pipeline is provided with an outlet vortex flowmeter and can measure the gas phase separated by the gas-liquid separator through the outlet vortex flowmeter and then transmit it to the outside. A liquid level meter is provided on the gas-liquid separator, and the drainage pipeline is provided with an electric liquid level regulating valve interlocked with the liquid level meter and can automatically drain the liquid. The end of the drainage pipeline is connected to the produced water manifold on the well site.

[0008] The gas-liquid separator is a horizontal gas-liquid separator.

[0009] The gas phase outlet of the gas-liquid separator is provided with a mist collector.

[0010] A liquid collecting bag for storing liquid is arranged at the lower part of the gas-liquid separator.

[0011] The liquid collecting bag is provided with a purge port.

[0012] The produced water manifold is provided with a manual valve bypass.

[0013] The gas-liquid separator is provided with a safety valve and a venting bypass.

[0014] The inlet vortex flowmeter, gas-liquid separator, inlet manifold, gas phase outlet pipeline, liquid discharge pipeline, outlet vortex flowmeter and produced water manifold are all installed on the same base to form an integrated skid-mounted device.

[0015] The advantages of the utility model are:

[0016] By connecting the vortex flowmeters at each inlet end to the gas-liquid separator through the inlet manifold and arranging an outlet vortex flowmeter on the gas phase outlet pipeline and an electric liquid level regulating valve interlocked with the liquid level meter on the drainage pipeline, the functions of single well metering, manifold metering, gas-liquid separation, automatic drainage and the like in a high-water-content coalbed methane well field can be met at the same time, effectively solving the problems of scattered equipment and long construction period in a high-yield coalbed methane well field. Its automated management achieves the condition of no fixed personnel on duty, thereby solving the difficulty of personnel inspection and helping users to monitor the production situation of the well field. In particular, the various components are centrally installed on the same base, so that it integrates the functions of single well metering, manifold metering, gas-liquid separation, automatic drainage and the like to form an integrated skid-mounted equipment, giving full play to the role of the skid, and realizing the factory prefabrication and modular operation of the process equipment in the high-water-content well field of the coalbed methane field, with a small footprint, and the characteristics of "modularization, miniaturization, convenient transportation, rapid installation, and flexible relocation". BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the top view of the structure of the utility model of the metering and separation integrated device for coalbed methane well field;

[0018] Figure 2 This is a schematic diagram of the main structure of the utility model of the metering and separation integrated device for coalbed methane well field;

[0019] In the figure, 1-inlet vortex flowmeter, 2-gas-liquid separator, 3-inlet manifold, 4-gas phase outlet pipeline, 5-liquid discharge pipeline, 6-outlet vortex flowmeter, 7-liquid level meter, 8-electric liquid level regulating valve, 9-produced water manifold, 10-mist collector, 11-purge port, 12-vent valve, 13-safety valve, 14-vent bypass. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the integrated metering and separation device for coalbed methane well sites of the utility model in conjunction with the accompanying drawings and specific implementation methods.

[0021] As shown in the figure, the metering and separation integrated device for coalbed methane well sites of the utility model can be applied to cluster high-water-content well sites of various gas fields. In addition to coalbed methane fields, conventional gas fields, tight gas fields, etc. are also applicable. It includes multiple inlet vortex flowmeters 1 for single well metering and a gas-liquid separator 2. In this embodiment, the gas-liquid separator 2 is a horizontal gas-liquid separator. Each inlet vortex flowmeter 1 is connected to the gas-liquid separator 2 through an inlet manifold 3. The gas-liquid separator 2 has a gas phase outlet pipeline 4 and a drainage pipeline 5. The gas phase outlet pipeline 4 is provided with an outlet vortex flowmeter 6 and can meter the gas phase separated by the gas-liquid separator through the outlet vortex flowmeter and then transport it out. The gas-liquid separator 2 is provided with a liquid level meter 7. The drainage pipeline 5 is provided with an electric liquid level regulating valve 8 interlocked with the liquid level meter and can automatically drain the liquid. The end of the drainage pipeline 5 is connected to the produced water manifold 9 on the well site.

[0022] Furthermore, in order to meet the liquid phase space requirements, a liquid collecting bag for storing liquid is provided at the bottom of the gas-liquid separator 2 to realize the liquid storage function; considering that the coalbed methane contains coal powder, and the coal powder accumulates in the liquid collecting bag to block the discharge port, a purge port 11 is provided on the liquid collecting bag, and the purge port 11 can be used to blow away the coal powder that has settled to the bottom, so that it is flushed away and discharged with the sewage; a manual valve bypass is provided on the produced water manifold 9, and a manual valve 12 is provided on the manual valve bypass to meet the emergency discharge requirements when the electric regulating valve cannot operate normally; a safety valve 13 and a vent bypass 14 are also provided on the gas-liquid separator 2; in addition, a mist collector 10 is provided at the gas phase outlet of the gas-liquid separator 2.

[0023] Furthermore, the inlet vortex flowmeter 1, gas-liquid separator 2, inlet manifold 3, gas phase outlet pipeline 4, discharge pipeline 5, outlet vortex flowmeter 6 and produced water manifold 9 are all installed on the same base to form an integrated skid-mounted equipment.

[0024] Its main working process is:

[0025] Gas from a single well enters the metering and separation integrated device for the coalbed methane well site of the utility model, and first uses the inlet end spiral vortex flowmeter 1 to measure the single well, and after measurement, enters the gas-liquid separator 2 through the inlet manifold 3 for gas-liquid two-phase separation, and the separated gas phase is measured by the outlet end spiral vortex flowmeter 7 and then transmitted to the outside, and the liquid phase enters the produced water manifold 10 on the well site, and an electric liquid level regulating valve 9 is arranged on the drainage pipeline 5, which is interlocked with the liquid level meter to realize the interlocking switch action of high and low liquid levels, and realize the automatic drainage function under unattended conditions; the gas-liquid separator 2 is adjusted under the operating pressure conditions of the well site, and can meet the accuracy requirements of droplets ≤100μm and solid particles ≤10μm, and a mist collector is arranged at the gas phase outlet of the separator.

[0026] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A metering and separation integrated device for coalbed methane well field, characterized by: The invention comprises a plurality of inlet vortex flowmeters (1) for single well metering and a gas-liquid separator (2), each of the inlet vortex flowmeters (1) being connected to the gas-liquid separator (2) via an inlet manifold (3), the gas-liquid separator (2) having a gas phase outlet pipeline (4) and a liquid discharge pipeline (5), the gas phase outlet pipeline (4) being provided with an outlet vortex flowmeter (6) and being capable of metering the gas phase separated by the gas-liquid separator through the outlet vortex flowmeter and then transmitting it to the outside, the gas-liquid separator (2) being provided with a liquid level meter (7), the liquid discharge pipeline (5) being provided with an electric liquid level regulating valve (8) interlocked with the liquid level meter and being capable of automatically discharging liquid, and the end of the liquid discharge pipeline (5) being connected to a produced water manifold (9) on a well site.

2. The integrated metering and separation device for coalbed methane well field according to claim 1, characterized in that: The gas-liquid separator (2) is a horizontal gas-liquid separator.

3. The integrated metering and separation device for coalbed methane well field according to claim 1 or 2, characterized in that: A mist collector (10) is provided at the gas phase outlet of the gas-liquid separator (2).

4. The integrated metering and separation device for coalbed methane well field according to claim 3 is characterized in that: A liquid collecting bag for storing liquid is provided at the lower part of the gas-liquid separator (2).

5. The integrated metering and separation device for coalbed methane well field according to claim 4 is characterized in that: The liquid collection bag is provided with a purge port (11).

6. The integrated metering and separation device for coalbed methane well field according to claim 1, 2, 4 or 5, characterized in that: The produced water manifold (9) is provided with a manual valve bypass (12).

7. The integrated metering and separation device for coalbed methane well field according to claim 6, characterized in that: The gas-liquid separator (2) is provided with a safety valve (13) and a venting bypass (14).

8. The integrated metering and separation device for coalbed methane well field according to claim 7, characterized in that: The inlet vortex flowmeter (1), the gas-liquid separator (2), the inlet manifold (3), the gas phase outlet pipeline (4), the liquid discharge pipeline (5), the outlet vortex flowmeter (6) and the produced water manifold (9) are all installed on the same base to form an integrated skid-mounted device.

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