RU1790540C - Equipment for transferring oil gas into underground reservoir - Google Patents

Abstract

The invention relates to the oil industry, in particular to the preparation and utilization of oil gas. To reduce the cost and simplify the installation for oil gas utilization, it is equipped with a high-pressure pump and at least two high-pressure tanks, inside which elastic separators of oil gas and pump working fluid are installed. At the same time, part of the tank above the separator is connected to the underground tank and low-pressure compressor, and part of the tank under the separator is connected to a high-pressure pump. The installation is also equipped with gas and liquid bypass valves and upper level sensors and low level liquid level detectors installed in high pressure vessels. 1 ill. h Ј

Description

The invention relates to the oil industry, in particular to pumping oil gas to an underground reservoir in the preparation and utilization of oil gas.

A gas pumping unit is known, including high-pressure compressors, a coolant pumping unit, and auxiliary equipment.

The disadvantage of the installation is the complexity and high cost of the equipment.

The closest in technical essence is the installation for pumping oil gas, including an underground tank, compressor, pipelines and shut-off elements with controls.

The disadvantage of the installation is the complexity and high cost, in particular of one of the main elements - high-pressure gas compressor.

The purpose of the invention is to reduce pumping costs. .;

This goal is achieved in that the installation for pumping oil gas into an underground tank, including a compressor, connected to the tank through pipelines with shut-off elements, and the control device is equipped with a high-pressure pump and at least two high-pressure tanks with installed inside them with elastic separators of oil gas and pump fluid, and some of the tanks under the separator through the bypass

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The valve is connected to a high-pressure pump, and part of the containers above the separators to an underground tank and compressor, which uses a low-pressure compressor, while the upper parts of high-pressure tanks are connected to the compressor with the possibility of alternating connection to the tanks, after filling them with gas, high pressure

pump .. The essence of the invention lies in the fact that the supply of the installation of a high-pressure pump, connected to high-pressure tanks in which elastic dividers are installed, can greatly simplify the installation and use inexpensive low-pressure compressors as the first stage of compression, which significantly reduces the cost of pumping oil gas into underground tanks.

The drawing shows a block diagram of an installation for pumping oil gas into an underground reservoir. .

The installation comprises a low-pressure .compressor 1 connected by a low-pressure pipe 2 through the bypass valves 3 and 4 with tanks 5 and 6, in which elastic dividers 7 and 8 are installed, fixed in diameter in the lower part of the tanks 5 and 6. Upper parts of the tanks 5 and 6 above said dividers 7 and 8 through high-pressure bypass valves 9 and 10 and pipe 11 are connected to the underground reservoir 12. The lower parts of the tanks 5 and 6 under the separating diaphragms 7 and 8 are connected through pipes 13 and 14 and the bypass valve (switch) 15 with high by a booster pump 16. The switch of the working fluid 1.5 is controlled by a control device 17 connected to the sensors 18 and 19 of the upper and lower level switches 20 and 21 of the working fluid installed in tanks 5 and 6. The pump 16 is also connected through the shut-off element 22 to the backup 23 dl working fluid.

As the switch 15, for example, twin valves can be used. Elastic dividers 7 and 8 are installed to prevent the dissolution of petroleum gas in the liquid.

Installation works as follows. Compressor 1, through pipelines 2 and bypass valves 3 and 4, injects low pressure petroleum gas into tanks 5 and 6. After filling the tanks 5 and 6 with gas, a high-pressure pump 16 is turned on, which from the reserve tank 23 pumps the working fluid through the switch 15

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into the container 5 under the separator 7. As the liquid level in the vessel 5 increases, the elastic separator 7 rises, while the gas pressure above the separator 7 increases in proportion to the increase in the liquid pressure under the diaphragm 7. The valve 3 closes. Upon reaching the required, for example, 20 MPa, or the calculated gas value, the bypass valve 9 is opened, and gas is supplied via the high-pressure pipe 11 to the underground reservoir 12 (e.g., into the well).

When the working fluid reaches the upper acceptable level, a sensor .18 is triggered, which gives a signal to the control device 17, the bypass valve 15 is activated, and the working fluid is pumped from the tank 5 from the tank 5 to the tank 6. The gas pressure in the tank b with increasing liquid level increases, and in the tank 5 with a decrease in the level decreases. When the gas pressure in the container 5 becomes less than the pressure at the outlet of the compressor 1, the valve 3 opens and the space above the separator 7 is filled with a new portion of gas. When the calculated value of the gas pressure in the tank 6 is reached, the bypass valve 10 opens, and the gas. via high-pressure pipe 11 it is supplied to the underground reservoir 12. Valves 9 and 10 are closed when the gas pressure drops below a predetermined value.

The following cycles are repeated in the same way. The use of two high-pressure tanks makes it possible to reduce the time of gas compression, since several operations are carried out simultaneously (in parallel):

Signaling devices 20 and 21 are necessary for monitoring the lower level of the working fluid in tanks 5 and 6 and connecting to the system (if necessary) through the shut-off element 22 of the reserve tank 23. For example, if it is necessary to increase the gas pressure from 1.0 to 20 MPa, then You can additionally use electric pumps of the type PE 580-200 (Q 580 m3 / h, Exc. 20 MPa) and separator tanks according to TU 16-01-608-76 (working pressure 32 MPa, volume 15 m3). At the same time, the installation capacity for gas inlet

580 10 le s /

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The characteristics are comparable with those of a compressor station of type 55 6M40-320. However, the cost of a compressor station is 3.6 times the cost

proposed installation. Scoooo 36) Ta

thus supplying the installation with a high-pressure pump and at least

two high-pressure tanks, inside which elastic dividers are installed, and the connection of the upper and lower parts of these tanks in a certain way with the pump, compressor and underground tank can significantly reduce the cost of pumping oil gas into the underground tank, because the main elements included in its composition are structurally simpler and less expensive than those of the prototype. The inventive apparatus can also be used to increase the pressure at the outlet of the second and third separation stages.

Formulation A unit for pumping oil gas into an underground tank, including a compressor connected to the tank via pipelines with shut-off elements, and a control device that relieves that, in order to reduce the cost of pumping, it is equipped with a high-pressure pump and at least two high-pressure tanks with elastic oil separators installed inside them and

the pump’s working fluid, with some of the containers under the separators through the bypass valve connected to the high-pressure pump, and part of the containers with the separators to the underground reservoir and compressor, which is used as a low-pressure compressor, while the upper parts of the high-pressure tanks are connected to the compressor with the possibility of alternately connecting to the tanks after filling them with high-pressure pump gas.