Skid-mounted oil-gas separation online metering device

Abstract

The utility model discloses a skid-mounted oil-gas separation on-line metering device which comprises a filter, a separation V pipe, a separation turning pipe, an oil-gas and oil testing pipeline, a self-control liquid level control system, a fine screening mechanism, a column type cyclone separation system and the like, and the skid-mounted oil-gas separation on-line metering device is used for screening and refining an oil-gas mixture for at least three times to form three boundary layers. A traditional separation tank structure is replaced with the V-shaped pipe and the bent pipe which are different in bending angle, the structure is simplified, and preliminary separation is carried out directly by means of a vortex part in the conveying process; a second vortex is formed at the junction of the inlets of the two sections of butted recovery pipelines, so that two-section separation is completed; by means of the two fine screening mechanisms which are asymmetrically arranged, impurity removal and collection are conducted on oil liquid obtained after two times of screening, the oil liquid is refined and purified, the oil liquid metering precision is improved, oil gas continuously separated from the oil liquid directly rises into an oil gas recycling pipeline, and the oil gas metering precision is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil production, and more specifically, it relates to a skid-mounted oil and gas separation on-line metering device. Background Art

[0002] Oil and gas metering mainly involves collecting and filtering the oil and gas from a single well, then separating them into corresponding gas and liquid and measuring them alternately at regular intervals. After metering, the oil and gas are transported to the transfer station by the wellhead pressure. In the daily production of an oilfield, the daily liquid production and gas production of each well are important data for single well analysis and block analysis in the oilfield. If the metering is inaccurate, it may cause cognitive errors and affect subsequent important judgments.

[0003] At present, although the taken oil and gas mixture has undergone at least one preliminary filtering operation, solid particles such as oil layer sand, rust, and carbon black mixed inside will cause certain deviation to the results during subsequent measurement. If not processed, the metering accuracy will decrease significantly. The existing oil and gas separation metering equipment has a bloated structure, occupies a large area, and is not convenient for design and construction. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present utility model is to provide a skid-mounted oil and gas separation on-line metering device to solve one or more of the above problems.

[0005] To achieve the above purpose, the present utility model provides the following technical solutions:

[0006] The skid-mounted oil and gas separation on-line metering device includes

[0007] A filter, which is respectively connected to the incoming liquid pipeline and the bypass pipeline;

[0008] A separation V-tube, one end of which is connected to the filter, and the other end is vertically and obliquely downward connected to an oil liquid recovery pipeline with a U-shaped cross-section;

[0009] A separation elbow pipe, one end of which is connected to the separation V-tube, and the other end is vertically and obliquely downward connected to an oil and gas recovery pipeline with an inverted U-shaped cross-section; the two ends of the oil liquid recovery pipeline and the oil and gas recovery pipeline are connected;

[0010] An oil and gas test pipeline, which is connected to the end of the oil and gas recovery pipeline and is provided with a gas flowmeter;

[0011] An oil liquid test pipeline, which is connected to the end of the oil liquid recovery pipeline and is provided with a liquid mass metering system; the oil liquid test pipeline and the oil and gas test pipeline converge into an outlet pipeline, and the bypass pipeline is also connected to the outlet pipeline;

[0012] An automatic liquid level control system, which is arranged at the end of the oil liquid recovery pipeline;

[0013] Two fine screening mechanisms, which are respectively arranged on the side walls on both sides of the automatic liquid level control series;

[0014] Columnar cyclone separation systems, which are respectively arranged in the separation V-tube, the separation elbow pipe, the oil and gas recovery pipeline and the oil liquid recovery pipeline.

[0015] Further, the corner angle of the separation V-tube is less than 65°, the corner angle of the separation elbow pipe is not greater than 90°, and the corner angle of the separation elbow pipe is greater than the corner angle of the separation V-tube.

[0016] Further, the bottom of the filter is connected to the bypass pipeline, and the top of the filter is connected to the separation V-tube.

[0017] Further, the head end of the separation V-tube is connected to the oil liquid recovery pipeline, and the head end of the separation elbow pipe is connected to the oil and gas recovery pipeline.

[0018] Further, the corner of the separation V-tube is the first gas-liquid separation area, and the connection between the oil liquid recovery pipeline and the oil and gas recovery pipeline is the second gas-liquid separation area.

[0019] Further, the fine screening mechanism includes

[0020] Fine screening boxes, which are communicatively arranged on the side wall of the automatic liquid level control system; the two fine screening boxes are arranged in a vertical offset manner and have a common area that is parallel and aligned;

[0021] One-way valves, which are arranged at the openings of the fine screening boxes and point to the inside of the fine screening boxes.

[0022] Further, separate discharge valves are provided at the bottom of the oil liquid recovery pipeline, the top of the oil and gas recovery pipeline, and the bottoms of the two fine screening mechanisms.

[0023] Further, the gas flowmeter and the liquid mass measurement system are both equipped with complete signal sending and receiving modules and self-control modules.

[0024] In summary, the utility model has the following beneficial effects: By replacing the traditional separation tank structure with V-tubes and elbow pipes with different bending angles, the structure is streamlined, and the preliminary separation is directly carried out by means of the vortex part in the transmission process; A second vortex is formed at the inlet junction of the two-section connected recovery pipelines to complete the two-stage separation; With the help of two asymmetrically arranged fine screening mechanisms, impurities are removed and collected from the oil liquid after two screenings, the pure oil liquid is refined, the oil liquid measurement accuracy is improved, and the oil and gas directly separated from this part rises into the oil and gas recovery pipeline, which also improves the oil and gas measurement accuracy. Description of the Drawings

[0025] Figure 1Schematic structural diagram of an implementation manner provided by the present utility model.

[0026] In the figure: 1, filter; 2, incoming liquid pipeline; 3, bypass pipeline; 4, separation V-tube; 5, oil liquid recovery pipeline; 6, separation elbow pipe; 7, oil-gas recovery pipeline; 8, oil-gas test pipeline; 9, oil liquid test pipeline; 10, liquid mass metering system; 11, outgoing liquid pipeline; 12, automatic liquid level control system; 13, fine screening mechanism; 14, fine screening box; 15, one-way valve; 16, discharge valve. Specific implementation manner

[0027] Embodiment:

[0028] The following further elaborates on the present utility model in conjunction with the attached Figure 1 drawings.

[0029] The skid-mounted oil-gas separation on-line metering device, as Figure 1As shown in the figure, it is connected to the incoming liquid pipeline 2, the outgoing liquid pipeline 11 and the bypass pipeline 3 from the outside. The skid-mounted oil and gas separation on-line metering device includes a filter 1, a separation V-tube 4, a separation elbow 6, a recovery pipeline, a test pipeline, a liquid mass metering system 10, a gas flowmeter, an automatic liquid level control system 12 and a fine screening mechanism 13. The filter 1 is a three-way structure, with the side interface connected to the incoming liquid pipeline 2, the bottom interface connected to the bypass pipeline 3, and the top interface connected to the separation V-tube 4. One end of the separation V-tube 4 is connected to the filter 1, and the other end is obliquely and vertically downward connected to the oil liquid recovery pipeline 5 with a U-shaped cross-section. The corner angle of the separation V-tube 4 is less than 65°, and the obliquely and vertically downward end is connected to the head end of the oil liquid recovery pipeline 5. One end of the separation elbow 6 is connected to the head of the obliquely and vertically downward end of the separation V-tube 4, and the other end is obliquely and vertically downward connected to the oil and gas recovery pipeline 7 with an inverted U-shaped cross-section. The corner angle of the separation elbow 6 is not greater than 90°. The corner angle of the separation elbow 6 is greater than that of the separation V-tube 4. The oil liquid recovery pipeline 5 and the oil and gas recovery pipeline 7 are connected into a loop structure and are externally connected to the test pipeline at their respective rear ends. The setting of different corner angles makes the flow velocities in their respective areas no longer uniform, which is not only conducive to forming the first stratified vortex in the separation V-tube 4 to complete the preliminary gas-liquid separation. The oil and gas recovery pipeline 7 and the oil liquid recovery pipeline 5 are divided into a head end and a rear end. The head end is connected to the separation elbow 6 or the separation V-tube 4, and the rear end is connected to the test pipeline. Specifically, the end of the oil and gas recovery pipeline 7 is connected to the oil and gas test pipeline 8, and a gas flowmeter is provided on the oil and gas test pipeline 8. The separation V-tube 4 is connected to the head end of the oil liquid recovery pipeline 5, and the separation elbow 6 is connected to the head end of the oil and gas recovery pipeline 7. The oil liquid recovery pipeline 5 is connected to the oil liquid test pipeline 9, and a liquid mass metering system 10 is provided on the oil liquid test pipeline 9. The oil liquid test pipeline 9 and the oil and gas test pipeline 8 converge to the outgoing liquid pipeline 11, and the bypass pipeline 3 is also connected to the outgoing liquid pipeline 11. The two recovery pipelines arranged in an up-and-down docking manner, different incoming material methods all cause a second stratified vortex to form at the docking place for the second gas-liquid separation. At the same time, the particularity of the oil liquid causes the flow velocity of the lower part of the head end of the oil liquid recovery pipeline 5 to slow down, forming different flow velocity areas with the vortex part, and the two form a third stratified vortex at the docking place at the end of the recovery pipeline. Each stratified vortex corresponds to a gas-liquid separation area. An automatic liquid level control system 12 is provided at the end of the oil liquid recovery pipeline 5, and a separate fine screening mechanism 13 is provided on each of the two side walls opposite to the automatic liquid level control system 12. The fine screening mechanism 13 is used for one-way filtering and collection of solid particle impurities carried by the oil liquid. The two fine screening mechanisms 13 are aligned left and right in the same vertical plane, but at different horizontal heights, and there is an overlapping part of the projection between the two in a certain vertical area. The fine screening mechanism 13 includes a fine screening box 14 and at least one one-way valve 15. The fine screening box 14 is communicatively arranged on the side wall of the automatic liquid level control system 12, and the one-way valve 15 is arranged at the opening of the fine screening box 14, and the screening direction points to the inside of the fine screening box 14.At the bottom of the oil recovery pipeline 5, at the top of the oil and gas recovery pipeline 7, and at the bottom of the two fine sieve boxes 14, there are separate discharge valves 16 for emergency discharge and other operations. The gas flowmeter and the liquid mass metering system 10 are both equipped with complete signal transmission modules and self-control modules, that is to say, both have functions such as online data upload monitoring and remote control. In the separation V-tube 4, the separation elbow pipe 6, the oil and gas recovery pipeline 7, and the oil and gas recovery pipeline 7, there are columnar cyclone separation systems, which mainly achieve gas-liquid separation. The oil and gas mixture is initially separated into oil and oil and gas through the action of the first stratified vortex in the separation V-tube 4. The oil passes through the separation V-tube 4 and enters the oil recovery pipeline 5, and the oil and gas pass through the separation elbow pipe 6 and enter the oil and gas recovery pipeline 7. The preliminarily separated oil continues to be screened at the second stratified vortex, and the separated gas rises and enters the oil and gas recovery pipeline 7 to merge with the oil and gas entering from the separation elbow pipe 6. The oil after secondary separation enters the fine sieve mechanism 13 after the speed is reduced to remove impurities, and continues to be separated at the third separation vortex. The oil and gas and the mixed oil and gas in the oil and gas recovery pipeline 7 enter the oil and gas test pipeline 8 and are metered by the gas flowmeter. The oil after tertiary separation enters the oil test pipeline 9 and is metered by the liquid mass metering system 10. The metered oil and oil and gas are mixed and then discharged from the liquid outlet pipeline 11 again, and the metered data is transmitted online.

[0030] It should be noted that this specific embodiment is only an interpretation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. Skid-mounted oil and gas separation online metering device, characterized by: include A filter (1) is connected to a liquid pipeline (2) and a bypass pipeline (3) respectively; A separation V-tube (4), one end of which is connected to the filter (1), and the other end of which is connected vertically and downwardly to an oil recovery pipeline (5) with a U-shaped cross section; A separation bend pipe (6), one end of which is connected to the separation V-tube (4), and the other end of which is vertically and obliquely connected to an oil and gas recovery pipeline (7) with an inverted U-shaped cross-section; the oil recovery pipeline (5) and the oil and gas recovery pipeline (7) are butt-jointed at both ends; An oil and gas test pipeline (8), which is connected to the end of the oil and gas recovery pipeline (7) and is provided with a gas flow meter; An oil test pipeline (9) is connected to the end of the oil recovery pipeline (5) and is provided with a liquid mass metering system (10); the oil test pipeline (9) and the oil and gas test pipeline (8) are merged into a liquid outlet pipeline (11), and the bypass pipeline (3) is also connected to the liquid outlet pipeline (11); An automatic liquid level control system (12) disposed at the end of the oil recovery pipeline (5); Two fine screening mechanisms (13), which are respectively arranged on the side walls on both sides of the automatic liquid level control system (12); A column-type cyclone separation system is respectively arranged in the separation V-tube (4), the separation bend pipe (6), the oil and gas recovery pipeline (7) and the oil recovery pipeline (5).

2. The skid-mounted oil-gas separation online metering device according to claim 1 is characterized in that: The corner angle of the separation V-tube (4) is less than 65°, the corner angle of the separation bend tube (6) is not greater than 90°, and the corner angle of the separation bend tube (6) is greater than the corner angle of the separation V-tube (4).

3. The skid-mounted oil-gas separation online metering device according to claim 1 is characterized in that: The bottom of the filter (1) is connected to the bypass pipeline (3), and the top of the filter (1) is connected to the separation V-tube (4).

4. The skid-mounted oil-gas separation online metering device according to claim 1 is characterized in that: The separation V-tube (4) is connected to the head end of the oil recovery pipeline (5), and the separation elbow pipe (6) is connected to the head end of the oil and gas recovery pipeline (7).

5. The skid-mounted oil-gas separation online metering device according to claim 1 is characterized in that: The corner of the separation V-tube (4) is a first gas-liquid separation zone, and the connection between the oil-liquid recovery pipeline (5) and the oil-gas recovery pipeline (7) is a second gas-liquid separation zone.

6. The skid-mounted oil-gas separation online metering device according to claim 1 is characterized in that: The fine screening mechanism (13) comprises A fine screening box (14) is disposed in communication with the side wall of the automatic liquid level control system (12); two of the fine screening boxes (14) are disposed in a staggered manner in the vertical direction and have a common area for parallel alignment; A one-way valve (15) is arranged at the opening of the fine screening box (14) and points toward the interior of the fine screening box (14).

7. The skid-mounted oil-gas separation online metering device according to claim 1 is characterized in that: Separate discharge valves (16) are provided at the bottom of the oil recovery pipeline (5), the top of the oil and gas recovery pipeline (7), and the bottoms of the two fine screening mechanisms (13).

8. The skid-mounted oil-gas separation online metering device according to claim 1 is characterized in that: The gas flow meter and the liquid mass metering system (10) are both provided with a complete set of signal receiving and sending modules and self-control modules.

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