SU1755864A1 - Oil preparation system for field pipeline transfer - Google Patents

Abstract

Area of use: oil production, namely, oil preparation devices for field transport from the well to the collection point. SUMMARY OF THE INVENTION: The oil treatment system for field transport includes inlet pipelines, a separation unit, a pumping station, and a discharge pipeline. New in the system is that a buffer tank (CU) is installed between the separation unit (VC) and the pumping station. The entrance to the BE zone is communicated with the US through the flow controller and the first shut-off valve (OK) in parallel. The gas zone BU is communicated with the gas pipeline (UE) US and through the second OK from the gas pipeline to the torch. The entrance of the pumping station through the third OK communicated with the reservoir. All OK have actuators from GP US.O and the first and second directly, and the third through the expansion tank, the throttle and the second OK, communicated sequentially, 1 sludge. cl

Description

The invention relates to the field of oil production, namely, oil treatment devices for field transport to the collection point.

A known system for the preparation of field transport of oil involves the separation of gas. The system comprises a first stage separation unit, a refrigeration unit in communication with the second stage separation unit. The emulsion oil under its own pressure is transported to the collection point.

This system can only be used when oil is transported for short distances.

Closest to the invention is a system comprising a separation unit, a pumping station, a tank, and a buffer tank.

The system provides for the separation of gas from oil and its transportation over considerable distances. However, it is unreliable in operation, requires considerable manual labor.

The aim of the invention is to improve the reliability and convenience of operating the system.

- This is achieved by the fact that the system including the pipeline, the separation unit, the pumping station, the discharge pipeline, the reservoir, the buffer tank according to the invention further comprises first, second, third shut-off valves, first and second pressure regulators, flow regulator, throttle , an expansion tank, wherein the buffer tank is in communication through a flow regulator connected in parallel and the first shut-off valve with a separation unit,

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the gas zone of the buffer tank communicates with the gas pipeline of the separation unit and through the second shut-off valve with the gas pipeline to the flare, the gas pipeline to the flare is connected through the first pressure regulator to the gas pipeline of the separation unit having the second pressure regulator, the pump station inlet communicates with the tank through the third shut-off valve, the first and second shut-off valves are driven by the gas pipeline of the separation unit, and the third valve is driven by the separation unit through the second shut-off valve, throttle and expansion tank, communicated via Consequently.

The presence of a buffer tank, a tank, elements of communication with the separation unit, gas pipelines and a pumping station ensures automatic switching of the system to emergency operation during a power outage, in the event of a failure to receive gas at the gas processing plant, in the event of a gas pipeline burst

In all these cases, oil production and transportation does not stop. When eliminating emergency situations, switching to normal operation also occurs automatically.

The performed analysis proves the possibility of achieving a positive effect in the implementation of the invention with this set of essential features

The drawing shows a diagram of an oil treatment system for field transport,

The system with automatic switching of operation mode consists of separation unit 10, connected to buffer tank 2 through parallel-connected flow controller 3 and the first shut-off valve A. Buffer tank 1 is connected to pump station 5 and reservoir 6. The processing equipment consists of gas pipelines, 8, 9, 10, 11, as well as oil pipelines 12, 13, 14, 15, 16, 17, 18. A technological pressure regulator 19 and a second pressure regulator 20 are installed on the gas pipeline 7 of separation unit 1, and on the gas pipeline 10 - the first pressure regulator 21, The pipeline 8 is provided with a check valve 22, and a second shut-off valve 23 is installed on the pipeline 9. The pipeline 7 connects separation unit 1 through a check valve 24 to a gas processing plant (GPP). On the pipe 17, which connects the pump station 5 to the central collection point (DSP), a control valve 25 and a check valve 26 are installed. The pipe 18 is provided with

the third shut-off valve 27 installed between the buffer tank 2 and the tank 6. The mechanism for switching the operating mode of the system consists of pipelines

28, 29, 30, 31, 32, 33 with solenoid valves 34, 35, 36, 37, as well as the expansion tank 38 and the throttle 39.

The system works as follows. In the normal mode of operation of the production of oil wells - a mixture of oil, gas and water (gas-liquid mixture) comes from the field to separation unit 1, where gas is separated from the liquid. Pipeline 12, 13, 14, and 15 through liquid through the first closed shut-off valve 4 and flow regulator 3 enters the buffer tank 2. The liquid level in separation unit 1 is maintained by flow regulator 3, which is connected to the separation zone by pipeline 11 1 through the pipeline 7, the liquid from the buffer tank 2 through the pipeline 16 enters the pumping station 5 and under pressure through the valves 25 and 26 through the pipeline 17 is supplied to

5 DSP. The valve 25 adjusts the level of the liquid in the buffer tank 2 by changing the flow rate of the pumping station 5. The gas separated from the production of wells from the separation unit 1 through the pipeline 7 through the process and second pressure regulators 19, 20 and the check valve 24 is fed to the gas treatment facility. The gas from the buffer tank 2 through the check valve 22 enters the pipeline 7 for the technological pressure regulator 19 along

5 gas movement and also sent to the GEA.

In the above case, the solenoid valves 34 and 36 are open, and 35 and 37 are closed. Second and third shut-off valves

0 23 and 27 are closed, and the first shut-off valve 4 is open. The process and second pressure regulators 19 and 20 are open, and the first pressure regulator 21 is closed.

In the event of a power outage, the system automatically switches to emergency operation. In this case, the pumping station 5 is turned off and the pumping of oil to the DSP is stopped, and the liquid from the buffer tank 2 enters the tank b. For this purpose, the solenoid valves 34 and 36 are closed, and the valves 35 and 37 are opened. The flow of gas into the actuator of the first shut-off valve 4 is stopped and it closes. In the drive of the second shut-off valve 23

5 from the pipeline 7 through the pipeline 28 through the valve 37 enters the gas under pressure and the valve 23 is opened, connecting the gas zone of the buffer tank 2 with the flare. The pressure in tank 2 decreases to atmospheric. From the valve actuator 23 gas at

line 29. throttle 39 and expansion tank 38 enters the actuator of the third shut-off valve 27. which opens to this. The choke and expansion tank 38 is used to delay the time between actuation of the second and third shut-off valves 23 and 27, so as not to run carbonated oil into tank 6 from buffer tank 2, Capacity 2 is set above tank b and oil enters by gravity. Fluid from separation unit 1 enters buffer tank 2 only through flow regulator 3, as the pressure drop between separation unit 1 and capacity 2 increases. Gas from separation unit 1 through line 6 through process and second pressure regulators 19, 20 and non-return valve 24 is fed to GLZ, and from buffer tank 2 to flare.

When the power supply is resumed, the system automatically switches to normal operation. The solenoid valves 35 and 37 are closed, and the valves 34 and 36 are opened. The first sampling valve 4 is opened, and the second and third shut-off valves 27, 23 are alternately closed. Moreover, the valve 27 is closed earlier than the valve 23 for the period of time necessary to reduce the pressure in the expansion tank 38 to atmospheric. The gas from the expansion tank 38, pipelines 29,30. 31 and 33 are flushed. Pump station 5 turns on and resumes pumping fluid to the DSP. The gas from the buffer tank starts to be supplied to the gas treatment facility again.

The system may switch to emergency mode due to a failure of the gas treatment facility to receive gas or in the event of a gas pipeline break between the system and the gas treatment plant.

In the first case, the gas is flushed through the first pressure regulator 21, which is triggered by an increase in pressure in the gas pipeline 7 above the calculated value.

At the same time, the production and transport of fluid does not stop.

In the second case, the pressure drops down behind the second pressure regulator 20, which closes and blocks the gas outlet to the GPP. The pressure in the pipeline 7 begins to increase, the first pressure regulator 21 opens, and the gas is discharged to the flare. This eliminates the pollution of the atmosphere by gas and the possibility of explosive situations. Pumping fluid and its production does not stop.

At elimination of emergency situations switching to a normal mode of operation occurs automatically.

Claims (1)

Claims of the Invention Oil treatment system for field transport, including a pipeline, separation unit, pumping station, discharge pipeline, tank, buffer tank, characterized in that, in order to increase reliability and ease of operation, the system further comprises first, second, third shut-off valves, first and second pressure regulators, flow regulator, throttle, expansion power; in this case, the buffer capacity is communicated through parallel connected flow regulator and the first shut-off valve Apan with a separation unit, the gas zone of the buffer tank communicates with the gas pipeline of the separation unit and through the second shut-off valve with the gas pipeline to the flare, the gas pipeline to the flare is connected through the first pressure regulator to the gas pipeline of the separation unit having a second pressure regulator, the pump station inlet communicates with the tank through the third shut-off valve, the first and second shut-off valves are driven by the gas pipeline of the separation unit, and the third valve is driven by the separation unit through the second shut-off valve, throttle and expansion valve capacity reported sequentially. Spispisla four 24 WWf 38  //////// Ж. P