Gas well wellhead gas-liquid metering device

Abstract

The present application relates to the technical field of device for separating matter produced in well, in particular to a gas well wellhead gas-liquid metering device. The gas well wellhead gas-liquid metering device comprises a gas-liquid separation cavity, a gas-liquid mixture inlet is arranged on the gas-liquid separation cavity, after the gas-liquid mixture enters the gas-liquid separation cavity, the gas goes up and the liquid goes down under the action of gravity, the upper end of the gas-liquid separation cavity is connected with a gas outlet pipe, the lower end of the gas-liquid separation cavity is connected with a liquid outlet pipe, a filter device is arranged inside the gas-liquid separation cavity below the gas-liquid mixture inlet, the filter device has capillary pores to make the gas bubbles contained in the liquid be blocked and the liquid pass through when the liquid flows, a gas flow meter is installed on the gas outlet pipe, and a liquid flow meter is installed on the liquid outlet pipe. By arranging the filter device with capillary pores in the gas-liquid separation cavity, the gas bubbles in the liquid are also separated out, the accuracy of the measurement data is ensured, and the gas well wellhead gas-liquid mixture is more suitable for measurement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of device for separating substances produced in a well, in particular to a gas well wellhead gas-liquid metering device. BACKGROUND

[0002] Gas well production metering is one of the important technical problems in the field of natural gas production, and production data such as gas production and liquid production are the basic data for monitoring water production, optimizing gas field production allocation, and ensuring rational development of gas reservoirs, and are important basis for development geological analysis and production decision-making. At present, the main measurement methods are separation metering and wellhead online metering.

[0003] For example, a gas well wellhead gas-liquid two-phase metering device is provided in a Chinese utility model patent with the authorization announcement number CN205858315U and the authorization announcement date January 4, 2017, which includes a buffer tank and a gas-liquid two-phase flowmeter. The gas-liquid two-phase flowmeter includes an upstream metering pipe section and a downstream metering pipe section. The buffer tank is installed on the upstream metering pipe section. A guide vane is arranged in the tank. The guide vane separates the buffer tank into upstream and downstream chambers. The upstream chamber and the downstream chamber are connected at the bottom of the buffer tank, which avoids the problem of large measurement error caused by the direct flow of slug flow through the gas-liquid two-phase flowmeter. A wellhead metering device and an oil well metering system are provided in a Chinese utility model patent with the authorization announcement number CN204785578U and the authorization announcement date November 18, 2015. The wellhead metering device includes a gas-liquid cyclone separator, a gas flowmeter, and a liquid flowmeter. The gas-liquid cyclone separator includes a gas flow port and a feed port at the upper end and a bottom flow port at the lower end. The feed port is connected with an oil inlet pipeline. The bottom flow port is connected with an oil outlet pipeline. The gas flow port is connected with a gas flow pipeline. The end of the gas flow pipeline is connected with the oil outlet pipeline and can mix gas and liquid at a gas-liquid connection point. The gas flowmeter is arranged in the gas flow pipeline. The liquid flowmeter is arranged in the oil outlet pipeline between the bottom flow port and the gas-liquid connection point.

[0004] However, the separation methods used in the above-mentioned patents are all based on gravity to separate gas and liquid for measurement. However, the separated liquid may contain bubbles in the actual process, which may cause certain errors in the measurement results. SUMMARY

[0005] The present application aims to provide a gas well wellhead gas-liquid metering device to solve the problem that the separated liquid in the existing gas well wellhead gas-liquid metering device may contain bubbles, which may cause certain errors in the measurement results.

[0006] The gas well wellhead gas-liquid metering device of the present application adopts the following technical scheme: a gas-liquid separation chamber is provided, a gas-liquid mixture inlet is arranged on the gas-liquid separation chamber, the gas-liquid mixture enters the gas-liquid separation chamber and the gas goes up and the liquid goes down under the action of gravity, the upper end of the gas-liquid separation chamber is connected with a gas outlet pipe, the lower end of the gas-liquid separation chamber is connected with a liquid outlet pipe, a filter device is arranged inside the gas-liquid separation chamber below the gas-liquid mixture inlet, the filter device has capillary pores to block the gas bubbles in the liquid when the liquid flows through, a gas flow meter is installed on the gas outlet pipe, and a liquid flow meter is installed on the liquid outlet pipe.

[0007] The gas well wellhead gas-liquid metering device of the present application improves the existing gas well wellhead gas-liquid metering device, and when used, the gas-liquid mixture enters the gas-liquid separation chamber through the gas-liquid mixture inlet, the gas goes up into the gas outlet pipe and the liquid goes down under the action of gravity, the gas bubbles in the liquid are blocked when the liquid flows to the capillary pores of the filter device due to the gas blocking effect (Jamin effect), the liquid flows through the capillary pores of the filter device and enters the liquid outlet pipe, ensuring complete separation of the gas and the liquid, and then the gas and the liquid are measured by the gas flow meter and the liquid flow meter respectively, ensuring the accuracy of the measurement data.

[0008] Further, the filter device includes a filter plate, and the capillary pores are uniformly distributed on the filter plate. The filter plate is provided with the capillary pores, which are uniformly distributed on the filter plate, so that the filtering area is larger and more uniform when the liquid flows, ensuring a quick and effective filtering process.

[0009] Further, the gas outlet pipe is arranged at the middle of the top end of the gas-liquid separation chamber. The gas floats upward in the gas-liquid separation chamber, and the gas outlet pipe is arranged at the middle of the top end, so that the gas flows in conveniently and effectively, ensuring the accuracy of the measurement.

[0010] Further, a float valve is arranged in the gas-liquid separation chamber and communicates with the gas outlet pipe. When the liquid surface of the gas-liquid mixture is high enough to reach the gas outlet pipe, the float valve will prevent the liquid from entering the gas outlet pipe, preventing the liquid from mixing in the gas outlet pipe and affecting the measurement effect of the gas flow meter.

[0011] Further, the float valve includes a float and a float seat communicating with the gas outlet pipe, and a guide structure is arranged between the float and the float seat to guide the float in the upward and downward directions. The gas-liquid separation chamber has a large volume, and when the liquid is higher than the filter device, the float will float inside the gas-liquid separation chamber. When the liquid surface rises, the guide structure can quickly and accurately stop the liquid by corresponding the float to the float seat, and the use effect is good.

[0012] Further, the guide structure is a guide column arranged on the filtering device, and the float is arranged on the guide column in a sliding manner. The guide column is arranged in correspondence with the float seat, the float can slide on the guide column to the float seat in a quick and accurate manner to stop the liquid, the use effect is good, and the guide column is convenient and simple to manufacture.

[0013] Further, the valve port of the float seat is downward and is a tapered port, and the top of the float is a tapered shape matched with the valve port. The valve port of the float seat is arranged as a tapered port, and the top of the float is a matched tapered shape, so that the top of the float is matched with the float seat to achieve a good sealing effect.

[0014] Further, the gas-liquid mixture inlet is connected with a gas-liquid mixture inlet pipe, the gas-liquid mixture inlet pipe extends into the gas-liquid separation cavity, and the gas-liquid mixture inlet pipe has a downward bending portion when extending into the gas-liquid separation cavity. The gas-liquid mixture inlet pipe extends into the gas-liquid separation cavity, so that the entering gas-liquid mixture acts on the middle part of the filtering device, and the gas-liquid mixture inlet pipe has a downward bending portion when extending into the gas-liquid separation cavity, so that the gas-liquid mixture directly acts on the filtering device when entering, to ensure that the gas-liquid mixture is separated quickly and effectively.

[0015] Further, the gas-liquid separation cavity is connected with a blowdown pipe below the filtering device, and the blowdown pipe is provided with a blowdown valve. When the gas-liquid separation cavity has more dirt, the blowdown valve in the blowdown pipe can be opened to blow down, so that the gas-liquid separation cavity is not blocked, and the subsequent use is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Structure schematic view of the embodiment one of the gas well wellhead gas-liquid metering device.

[0017] Figure 2 For Figure 1 Structure schematic view of the filtering plate in the embodiment one.

[0018] In the figure: 1, gas-liquid separation cavity; 2, blowdown pipe; 4, filtering plate; 41, plate body; 42, capillary channel; 5, guide column; 6, gas-liquid mixture inlet pipe; 7, float; 8, float seat; 9, gas outlet pipe; 10, gas flow meter; 11, gas-liquid mixture outlet pipe; 12, liquid flow meter; 13, liquid outlet pipe; 31, blowdown valve; 32, gas-liquid mixture inlet valve; 33, gas outlet valve; 34, gas-liquid mixture outlet valve; 35, liquid outlet valve. DETAILED DESCRIPTION

[0019] The features and performances of the present application are further described in detail below in combination with the embodiments.

[0020] The specific embodiment one of the gas well wellhead gas-liquid metering device of the present application is as follows:

[0021] The gas well wellhead gas-liquid metering device of the present application, as shown in Figures 1-2 The gas well wellhead gas-liquid metering device, as shown in

[0022] The gas-liquid mixture inlet pipe 6 is provided on the inner wall of the gas-liquid separation cavity 1 above the filter plate 4, and the gas-liquid mixture inlet valve 32 is arranged on the gas-liquid mixture inlet pipe 6. The gas-liquid mixture inlet pipe 6 extends to the inside of the gas-liquid separation cavity 1 and has a downward bending section at the extending end.

[0023] The gas outlet pipe 9 is connected to the middle of the top end of the gas-liquid separation cavity 1, and the gas outlet pipe 9 includes a vertical section and a horizontal section. The gas outlet valve 33 is arranged on the horizontal section close to the vertical section, and the gas flow meter 10 is arranged on the horizontal section away from the vertical section. Specifically, the float valve is arranged inside the gas-liquid separation cavity 1 at the gas outlet pipe 9, and the float valve includes the float 7 and the float seat 8. The diameter of the float seat 8 is larger than that of the gas outlet pipe 9 and is in communication with the gas outlet pipe 9. The guide column 5 is vertically arranged on the filter plate 4 at the position corresponding to the float seat 8. The float 7 is slidingly arranged on the guide column 5. The valve port of the float seat 8 is downward and conical. The top of the float 7 is conical and is adapted to the valve port.

[0024] The liquid outlet pipe 13 is connected to the lower position of the side wall of the gas-liquid separation cavity 1. The liquid outlet valve 35 is arranged on the liquid outlet pipe 13 close to the gas-liquid separation cavity 1, and the liquid flow meter 12 is arranged on the liquid outlet pipe 13 away from the gas-liquid separation cavity 1. The blowdown pipe 2 is arranged on the side wall of the liquid outlet pipe 13 away from the other end of the side wall, and the blowdown valve 31 is arranged on the blowdown pipe 2.

[0025] The liquid outlet pipe 13 and the gas outlet pipe 9 are merged at the outlet end to form the gas-liquid mixture discharge pipe 11. The height of the gas-liquid mixture discharge pipe 11 is higher than that of the blowdown pipe 2, and the gas-liquid mixture discharge valve 34 is arranged on the gas-liquid mixture discharge pipe 11.

[0026] The gas well wellhead gas-liquid metering device of the present application, when in use, opens the gas-liquid mixture inlet valve 32, the gas-liquid mixture enters the gas-liquid separation chamber 1 through the gas-liquid mixture inlet pipe 6, the gas-liquid mixture is affected by gravity and the gas goes up into the gas outlet pipe 9, the liquid flows down to the filter plate 4, the gas bubbles contained in the liquid are prevented by the gas blocking effect (Jamin effect) when flowing to the capillary channel 42 of the filter plate 4, the liquid flows from the capillary channel 42 of the filter plate 4 into the liquid outlet pipe 13, after the filter plate 4 completely separates the gas and the liquid, the gas and the liquid are metered by the gas flow meter 10 of the gas outlet pipe 9 and the liquid flow meter 12 of the liquid outlet pipe 13 respectively, ensuring the accuracy of the metering data, when the liquid of the gas-liquid mixture is higher than a certain degree, the float 7 floats along the guide column 5 with the change of the liquid level, and when the liquid level is close to the gas outlet pipe 9, the float seat 8 cooperates to block the gas outlet pipe 9 to prevent the liquid from entering the gas outlet pipe 9, when the gas-liquid separation chamber 1 has accumulated more dirt after a period of operation, the blowdown valve 31 of the blowdown pipe 2 can be opened to blow down.

[0027] From the above description of the specific embodiment one of the gas well wellhead gas-liquid metering device of the present application, it can be seen that the gas well wellhead gas-liquid metering device of the present application sets a filter plate containing a capillary channel in the gas-liquid separation chamber, so that the gas bubbles in the liquid are separated out, the gas-liquid mixture is separated more thoroughly, and then the flow of the gas and the liquid is metered respectively, ensuring the accuracy of the measurement data, which is more suitable for measuring the gas-liquid mixture at the wellhead of a gas well.

[0028] Of course, the gas well wellhead gas-liquid metering device of the present application is not limited to the above-mentioned embodiments. The following also lists several other embodiments of the gas well wellhead gas-liquid metering device based on the design concept of the present application.

[0029] For example, in other embodiments, unlike the above-mentioned embodiment one, the gas outlet pipe is arranged on the side wall of the upper gas cavity of the gas-liquid separation chamber close to the top, and the gas outlet pipe is no longer provided with a vertical section.

[0030] For another example, in other embodiments, unlike the above-mentioned embodiment one, the float valve includes a cavity and a float ball arranged in the cavity, the upper end of the cavity is communicated with the gas outlet pipe, the side wall and the bottom wall of the cavity are provided with a gas passage, the float ball is separated from the gas outlet pipe under the action of gravity to make the gas discharge, and the float ball blocks the gas outlet pipe under the action of buoyancy to prevent the liquid from entering the gas outlet pipe.

[0031] Or in other embodiments, unlike the above-mentioned embodiment one, a guide column is arranged on the float seat, and the float is slidingly arranged on the guide column.

[0032] Or in other embodiments, unlike the above-mentioned embodiment one, the outlet end of the gas-liquid mixture inlet pipe is fixedly connected with the side wall of the gas-liquid separation chamber, and no longer extends into the inside of the gas-liquid separation chamber.

[0033] The above merely illustrates the preferred embodiments of the present application, and is not used to limit the present application. The patent protection scope of the present application is defined by the claims, and any equivalent structural changes made according to the content of the specification and drawings of the present application should be included in the protection scope of the present application.

Claims

1. A gas-liquid metering device for gas well head, comprising a gas-liquid separation chamber (1), a gas-liquid mixture inlet is arranged on the gas-liquid separation chamber (1), the gas-liquid mixture enters the gas-liquid separation chamber (1) and is affected by gravity, the gas goes up and the liquid goes down, the upper end of the gas-liquid separation chamber (1) is connected with a gas outlet pipe (9), and the lower end of the gas-liquid separation chamber (1) is connected with a liquid outlet pipe (13), characterized in that, The filter device is arranged inside the gas-liquid separation cavity (1) below the gas-liquid mixture inlet, and has capillary pores (42) to hinder the gas bubbles contained in the liquid when the liquid flows through, the gas outlet pipe (9) is provided with a gas flow meter, and the liquid outlet pipe (13) is provided with a liquid flow meter; the gas-liquid separation cavity (1) is provided with a float valve at the position communicated with the gas outlet pipe (9), the float valve comprises a float (7) and a float seat (8) communicated with the gas outlet pipe (9), and a guide structure for guiding the float (7) in the up-down direction is arranged between the float (7) and the float seat (8); the guide structure is a guide column (5) arranged on the filter device, and the float (7) is slidingly arranged on the guide column (5).

2. The gas wellhead gas-liquid metering device of claim 1, wherein, The filter device comprises a filter plate (4), and the capillary pores (42) are uniformly distributed on the filter plate (4).

3. The gas wellhead gas-liquid metering device of claim 1, wherein, The gas outlet pipe (9) is arranged at the middle of the top end of the gas-liquid separation cavity (1).

4. The gas wellhead gas-liquid metering device of claim 1, wherein, The valve port of the float seat (8) faces downward and is a conical port, and the top of the float (7) is a conical top matched with the valve port.

5. The gas-liquid metering device for gas wellhead according to any one of claims 1-4, characterized in that, The gas-liquid mixture inlet pipe (6) is connected to the gas-liquid mixture inlet, extends into the gas-liquid separation cavity (1), and has a downward bending portion when extending into the gas-liquid separation cavity (1).

6. The gas-liquid metering device for gas wellhead according to any one of claims 1-4, characterized in that, The gas-liquid separation cavity (1) is connected with a sewage pipe (2) below the filter device, and the sewage pipe (2) is provided with a sewage valve (31).

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