Online continuous differential pressure weighing metering device and metering method

Abstract

The invention discloses an on-line continuous differential pressure weighing metering device and metering method, and belongs to the technical field of oil and gas field exploitation, the on-line continuous differential pressure weighing metering device comprises a plurality of metering tanks, each metering tank is provided with a gas outlet, a crude oil inlet and a liquid outlet, the gas outlet is detachably and rapidly connected with an exhaust confluence pipeline, and the crude oil inlet is connected with the liquid outlet. The crude oil inlet is detachably and quickly connected with the oil inlet confluence pipeline, the liquid outlet is detachably and quickly connected with the multiphase confluence pipe, the number of the metering tanks needing to be used can be flexibly adjusted according to the on-site oil quantity condition, the crude oil inlet of each metering tank is provided with a first electric one-way valve, and the liquid outlet of each metering tank is provided with a second electric one-way valve. Meanwhile, a weighing pressure transmitter and a vortex gas flow meter are arranged, opening and closing actions of a first electric one-way valve and a second electric one-way valve are controlled through a controller of the field control assembly, and measurement data of the weighing pressure transmitter and the vortex gas flow meter are recorded through a data transmission unit; and the controllability and automation of uninterrupted measurement can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field exploitation, and in particular to an online continuous differential pressure weighing metering device and a metering method. Background Art

[0002] In the process of crude oil extraction, the ratio of oil, water and gas is an important parameter to characterize the oil field reservoir. It is also an important basis for formulating and adjusting oil field extraction plans and optimizing production parameters. Real-time, accurate, fast and effective measurement of oil, water and gas production is of great significance to optimizing production, improving oil field work efficiency and saving oil field development costs.

[0003] In the current crude oil production process, for online measurement, a separate water content monitoring instrument is required and the liquid level of the water content measuring instrument needs to be kept still, so continuous and uninterrupted measurement of crude oil cannot be achieved. In addition, a tipping bucket oil measuring device is mostly used for oil measurement. After multiple cumulative weighings, errors will occur in oil measurement due to the viscosity of the crude oil, which seriously affects the measurement accuracy. Regular shutdown for cleaning and maintenance is required, and it cannot be used for online continuous metering operations. Summary of the invention

[0004] In view of the above problems, the present invention provides an online continuous differential pressure weighing metering device and a metering method, which can realize uninterrupted metering operation, have high metering reliability, can be flexibly adjusted according to the oil volume, and have high flexibility in use.

[0005] The technical solution of the present invention is:

[0006] An online continuous differential pressure weighing and metering device comprises a plurality of metering tanks, each of which is provided with a gas outlet at the top, a crude oil inlet at the upper side, and a liquid outlet at the bottom of the tank body;

[0007] The gas outlet of each metering tank is connected to the exhaust merging pipe through an exhaust pipe, and the exhaust pipe is connected to the exhaust merging pipe by a quick release method;

[0008] The liquid outlet of each metering tank is connected to the multiphase manifold through an outlet pipe, the outlet pipe is connected to the multiphase manifold by a quick release method, and the end of the exhaust pipe away from the metering tank is connected to the multiphase manifold;

[0009] The crude oil inlet of each metering tank is connected to the oil inlet merging pipeline through an oil inlet pipeline, and the oil inlet pipeline is connected to the oil inlet merging pipeline by a quick release method. A first electric one-way valve is provided at the crude oil inlet of each metering tank, and a second electric one-way valve is provided at the liquid outlet of each metering tank;

[0010] A weighing pressure transmitter is provided on each of the metering tanks, and a swirl gas flowmeter is provided at the gas outlet of each of the metering tanks;

[0011] The device also includes a field control component, which includes a controller, a data transmission unit and a manual / automatic switching module. The data transmission unit, the manual / automatic switching module, the first electric one-way valve, the second electric one-way valve, the weighing pressure transmitter, and the swirl gas flowmeter are connected to the controller signal.

[0012] A gas flow meter is provided on the exhaust gas confluence duct.

[0013] The multiphase converging pipeline is provided with a plurality of branch joints at intervals along the flow direction thereof, and each of the branch joints is communicated with a liquid outlet of the metering tank.

[0014] The device also includes a remote control component, which is signal-connected to the on-site control component.

[0015] The bottom of the metering tank is provided with moving wheels.

[0016] The online metering method based on the online continuous differential pressure weighing metering device comprises the following steps:

[0017] S1. Determine the number of metering tanks to be used according to site requirements and oil field flow rate;

[0018] S2, connecting the liquid outlets of a determined number of metering tanks to the multiphase manifold, the crude oil inlets to the oil inlet manifold line, and the gas outlets to the exhaust pipe;

[0019] S3, closing all first electric one-way valves and second electric one-way valves;

[0020] S4, opening the first electric one-way valve and the second electric one-way valve of one of the metering tanks, and the multiphase crude oil flows into the metering tank with the opened channel;

[0021] S5. After the crude oil enters the metering tank, the gas and liquid separate by themselves, and the separated gas is discharged along the exhaust pipe on the top of the metering tank. When discharged, the flow rate is measured by the vortex gas flowmeter, and the weighing pressure transmitter measures the weight of the oil-water mixed liquid in the tank in real time. After the measurement requirements are met, the controller closes the first electric check valve and the second electric check valve of the metering tank, and switches to open the first electric check valve and the second electric check valve of another group of metering tanks;

[0022] S6, looping step S5 to achieve uninterrupted continuous measurement;

[0023] S7. After the measurement is completed, the measurement data are summarized and the oil-water mixture density and gas volume are calculated.

[0024] The beneficial effects of the present invention are:

[0025] Each metering tank is connected to the confluence pipe by means of quick release. Moving wheels are arranged at the bottom of each metering tank, so that it can be flexibly moved to the operating position according to the on-site conditions. The number of metering tanks can be flexibly adjusted according to the on-site oil quantity conditions. When a metering tank fails, it can be quickly repaired without stopping the machine to ensure the continuity of metering. The liquid output, gas volume and water content can be monitored, which can provide strong support for underground production operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a differential pressure weighing metering device for oil and gas fields according to an embodiment of the present invention;

[0027] Figure 2 A schematic structural diagram of a multiphase manifold of a differential pressure weighing metering device for oil and gas fields according to an embodiment of the present invention;

[0028] Figure 3 It is a structural schematic diagram of a field control component of an oil and gas field pressure differential weighing metering device according to an embodiment of the present invention;

[0029] Figure 4 It is a schematic diagram of the connection between a field control component and a remote control component of a differential pressure weighing metering device for oil and gas fields according to an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1 is a metering tank, 2 is a gas outlet, 3 is a crude oil inlet, 4 is a liquid outlet, 5 is an exhaust manifold, 6 is a multiphase manifold, 7 is an oil inlet manifold, 8 is a first electric one-way valve, 9 is a second electric one-way valve, 10 is a weighing pressure transmitter, 11 is a swirl gas flowmeter, 12 is a field control component, 13 is a remote control component, 21 is an exhaust pipe, 31 is an oil inlet pipe, 41 is an outlet pipe, 51 is a gas flowmeter, 61 is a branch joint, 121 is a controller, 122 is a data transmission unit, and 123 is a manual / automatic switching module. DETAILED DESCRIPTION

[0032] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0033] Example:

[0034] like Figure 1-Figure 4 As shown, an online continuous differential pressure weighing metering device comprises a plurality of metering tanks 1, each metering tank 1 is provided with a gas outlet 2 at the top, a crude oil inlet 3 at the upper side, and a liquid outlet 4 at the bottom of the tank body;

[0035] The gas outlet 2 of each metering tank 1 is connected to the exhaust converging pipe 5 through the exhaust pipe 21, and the exhaust pipe 21 is connected to the exhaust converging pipe 5 by a quick release method;

[0036] The liquid outlet 4 of each metering tank 1 is connected to the multiphase manifold 6 through the outlet pipe 41, the outlet pipe 41 is connected to the multiphase manifold 6 by a quick release method, and the end of the exhaust pipe 21 away from the metering tank 1 is connected to the multiphase manifold 6;

[0037] The crude oil inlet 3 of each metering tank 1 is connected to the oil inlet merging pipeline 7 through the oil inlet pipeline 31, and the oil inlet pipeline 31 is connected to the oil inlet merging pipeline 7 by a quick release method. A first electric one-way valve 8 is provided at the crude oil inlet of each metering tank 1, and a second electric one-way valve 9 is provided at the liquid outlet 4 of each metering tank 1;

[0038] A weighing pressure transmitter 10 is provided on each metering tank 1, and a swirl gas flowmeter 11 is provided at the gas outlet 2 of each metering tank 1;

[0039] The device also includes a field control component 12, which includes a controller 121, a data transmission unit 122 and a manual / automatic switching module 123. The data transmission unit 122, the manual / automatic switching module 123, the first electric one-way valve 8, the second electric one-way valve 9, the weighing pressure transmitter 10, and the swirl gas flowmeter 11 are signal-connected to the controller 121.

[0040] The working principle of the above technical solution is as follows:

[0041] A gas outlet 2, a crude oil inlet 3 and a liquid outlet 4 are provided on each metering tank 1. The gas outlet 2 is detachably connected to the exhaust manifold 5 through an exhaust pipe 21, the crude oil inlet 3 is detachably connected to the oil inlet manifold 7 through an oil inlet pipe 31, and the liquid outlet 4 is detachably connected to the multiphase manifold 6 through an outlet pipe. By means of quick disassembly, the number of metering tanks 1 to be used can be flexibly adjusted according to the on-site oil quantity situation. A first electric one-way valve 8 is provided at the crude oil inlet of each metering tank 1, and a second electric one-way valve 9 is provided at the liquid outlet 4. A weighing pressure transmitter 10 and a vortex gas flowmeter 11 are also provided. The switching actions of the first electric one-way valve 8 and the second electric one-way valve 9 are controlled by a controller 121 of a field control component 12, and the measurement data of the weighing pressure transmitter 10 and the vortex gas flowmeter 11 are recorded by a data transmission unit 122, so that the controllability and automation of uninterrupted measurement can be achieved, and the manual / automatic switching module 123 can ensure the safety of the equipment.

[0042] The multiphase converging pipe 6 is provided with a plurality of branch joints 61 at intervals along its flow direction. Each branch joint 61 is connected to the liquid outlet 4 of a metering tank 1. When not in use, the branch joint 61 is in a closed state and can be used flexibly as needed, thereby realizing the flexibility of the use of the device.

[0043] A gas flow meter 51 is provided on the exhaust gas conduit 5, which can ensure the safety of the equipment by comparing the total gas flow and the gas flow of each independent metering tank 1, detect gas leakage or other faults in time, and handle the faults conveniently and quickly.

[0044] The device also includes a remote control component 13, which is connected to the on-site control component 12 by signal, and can realize automation of equipment use by remote control.

[0045] The bottom of the metering tank 1 is provided with moving wheels for easy movement, and the working position and the working quantity can be flexibly adjusted according to the working environment.

[0046] The online metering method based on the online continuous differential pressure weighing metering device comprises the following steps:

[0047] S1. Determine the number of metering tanks to be used according to site requirements and oil field flow rate;

[0048] S2, connecting the liquid outlets of a determined number of metering tanks to the multiphase manifold, the crude oil inlets to the oil inlet manifold line, and the gas outlets to the exhaust pipe;

[0049] S3, closing all first electric one-way valves and second electric one-way valves;

[0050] S4, opening the first electric one-way valve and the second electric one-way valve of one of the metering tanks, and the multiphase crude oil flows into the metering tank with the opened channel;

[0051] S5. After the crude oil enters the metering tank, the gas and liquid separate by themselves, and the separated gas is discharged along the exhaust pipe on the top of the metering tank. When discharged, the flow rate is measured by the vortex gas flowmeter, and the weighing pressure transmitter measures the weight of the oil-water mixed liquid in the tank in real time. After the measurement requirements are met, the controller closes the first electric check valve and the second electric check valve of the metering tank, and switches to open the first electric check valve and the second electric check valve of another group of metering tanks;

[0052] S6, looping step S5 to achieve uninterrupted continuous measurement;

[0053] S7. After the measurement is completed, the measurement data are summarized and the oil-water mixture density and gas volume are calculated.

[0054] It can work through the Internet of Things and cloud platforms, and can achieve unattended, remote operation, automatic metering and motion control, which can ensure the continuity and reliability of the entire metering process. It can establish a database according to needs, automatically record metering data, intelligent data query, and automatically generate oil well production curves according to production conditions. It can be used to evaluate the status of formation reservoirs, evaluate the effectiveness of operations, determine the production capacity and output of oil wells, and provide quantitative data for production decisions such as improving oil production and development processes, increasing oil field recovery rates, and extending the mining life of oil fields. The controller can also set a dynamic display interface, which can be viewed online in real time and remotely, and through the equipment process screen, the inlet and outlet liquid speeds, water content control, etc. can be observed to judge the fluidity of crude oil and production changes, and conduct online physical examinations on oil well production, thereby achieving an auxiliary guiding role in oil well production measures.

[0055] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An online continuous differential pressure weighing and metering device, characterized in that: It comprises a plurality of metering tanks, each of which is provided with a gas outlet at the top, a crude oil inlet at the upper side, and a liquid outlet at the bottom of the tank body; The gas outlet of each metering tank is connected to the exhaust merging pipe through an exhaust pipe, and the exhaust pipe is connected to the exhaust merging pipe by a quick release method; The liquid outlet of each metering tank is connected to the multiphase manifold through an outlet pipe, the outlet pipe is connected to the multiphase manifold by a quick release method, and the end of the exhaust pipe away from the metering tank is connected to the multiphase manifold; The crude oil inlet of each metering tank is connected to the oil inlet merging pipeline through an oil inlet pipeline, and the oil inlet pipeline is connected to the oil inlet merging pipeline by a quick release method. A first electric one-way valve is provided at the crude oil inlet of each metering tank, and a second electric one-way valve is provided at the liquid outlet of each metering tank; A weighing pressure transmitter is provided on each of the metering tanks, and a swirl gas flowmeter is provided at the gas outlet of each of the metering tanks; The device also includes a field control component, which includes a controller, a data transmission unit and a manual / automatic switching module. The data transmission unit, the manual / automatic switching module, the first electric one-way valve, the second electric one-way valve, the weighing pressure transmitter, and the swirl gas flowmeter are connected to the controller signal.

2. An online continuous differential pressure weighing and metering device according to claim 1, characterized in that: The multiphase converging pipeline is provided with a plurality of branch joints at intervals along the flow direction thereof, and each of the branch joints is communicated with a liquid outlet of the metering tank.

3. The online continuous differential pressure weighing and metering device according to claim 1, characterized in that: A gas flow meter is provided on the exhaust gas confluence duct.

4. The online continuous differential pressure weighing and metering device according to claim 1, characterized in that: The device also includes a remote control component, which is signal-connected to the on-site control component.

5. The online continuous differential pressure weighing and metering device according to claim 1, characterized in that: The bottom of the metering tank is provided with moving wheels.

6. An online metering method based on an online continuous differential pressure weighing metering device, characterized in that: The steps include: S1. Determine the number of metering tanks to be used according to site requirements and oil field flow rate; S2, connecting the liquid outlets of a determined number of metering tanks to the multiphase manifold, the crude oil inlets to the oil inlet manifold line, and the gas outlets to the exhaust pipe; S3, closing all first electric one-way valves and second electric one-way valves; S4, opening the first electric one-way valve and the second electric one-way valve of one of the metering tanks, and the multiphase crude oil flows into the metering tank with the opened channel; S5. After the crude oil enters the metering tank, the gas and liquid separate by themselves, and the separated gas is discharged along the exhaust pipe on the top of the metering tank. When discharged, the flow rate is measured by the vortex gas flowmeter, and the weighing pressure transmitter measures the weight of the oil-water mixed liquid in the tank in real time. After the measurement requirements are met, the controller closes the first electric check valve and the second electric check valve of the metering tank, and switches to open the first electric check valve and the second electric check valve of another group of metering tanks; S6, looping step S5 to achieve uninterrupted continuous measurement; S7. After the measurement is completed, the measurement data are summarized and the oil-water mixture density and gas volume are calculated.

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