Installation of gas treatment

 

(57) Abstract:

The invention relates to the oil industry and can be used for preparation of gas-gas and gas-condensate wells. Ensures the preparation of gas two different horizons with significantly different formation pressure and composition on one system while improving the quality of gas. The inventive installation comprises an inlet separator for the production of gas-condensate wells, recuperative heat exchanger, the ejector, the low-temperature separator, three phase separators of the first and second stages and degasser. Additionally the plant is equipped with series-connected input separator for the production of gas wells, regenerative gas-liquid heat exchanger, a throttle valve control. The output of the inductor is connected to the input of the low-temperature separator. The lower part of the low temperature separator is connected through the control valve with the inlet annulus regenerative gas-liquid heat exchanger. The output annulus associated with three-phase separator second stage. 1 Il.

The invention relates to the field of gas industry and may the I gas Collection and field preparation of gas on the Northern oil fields of Russia," A. I. Gritsenko, V. A. Istomin and others, Moscow, Nedra, 1999, pp. 372-373), including separators, heat exchanger and three-phase separator.

The disadvantage of this setup is the inability to simultaneously prepare two different gas horizons with significantly different reservoir pressures and compositions.

Also known device for gas treatment (ibid, pp. 378-379), comprising an inlet separator, recuperative heat exchanger, the ejector, the low-temperature separator, three phase separators of the first and second stages and degasser.

The disadvantage of this setup is the inability to simultaneously prepare two different gas horizons with significantly different reservoir pressures and compositions.

The task of the invention is the obtaining of gas of high quality, produced from different horizons with minimal capital and operating costs.

The technical result for the solution of which the invention is directed preparation of gas two different horizons with significantly different formation pressure and composition on one system while improving the quality of gas.

Postavljeno separator for the production of gas-condensate wells, recuperative heat exchanger, the ejector, the low-temperature separator, three phase separators of the first and second stages and degasser, unlike the prototype, the installation is further provided with series-connected input separator for the production of gas wells, regenerative gas-liquid heat exchanger, a throttle, the output of which is connected to the input of the low-temperature separator and valve-regulator, through which the lower part of the low temperature separator is connected to the input annulus regenerative gas-liquid heat exchanger, and the outlet annulus associated with three-phase separator second stage.

The drawing shows a gas treatment unit.

It includes an inlet separator for the production of gas condensate wells 1, connected in series with the regenerative heat exchanger 2, the ejector 3, the low-temperature separator 4. The plant is equipped with three-phase separator first stage 5, three-phase separator second stage 6, the degasser 7. In addition, the device has an inlet separator for the production of gas wells 8, regenerative gas-liquid heat exchanger 9, the inductor 10 and the valve - RM to 13 MPa to inlet separator for the production of gas condensate wells 1, where the separation of water and condensate. Then the gas enters the regenerative heat exchanger 2 and further to the ejector 3, and after reducing the pressure on it to 7.5 MPa in the low-temperature separator 4. Here, after passing the inlet separator product gas wells 8, regenerative gas-liquid heat exchanger 9 and reduce the pressure on the choke 10 to 7.5 MPa is supplied products gas wells. Mixing in the low-temperature separator gas gas and gas condensate wells allows to increase the calorific value of marketable gas due to its saturation with ethane and other light hydrocarbons) while maintaining a low dew point of hydrocarbons, and also allows you to reduce the amount of light gaseous hydrocarbons in an unstable condensate (NC), resulting in reduced loss of liquid hydrocarbons (C5+) when directly and condensate stabilization. In the low-temperature separator 4 is separated from the gas mixture of water and hydrocarbon condensate. To prevent hydrate formation in the gas stream at the input of the regenerative heat exchanger 2 and a regenerative gas-liquid heat exchanger 9 is injected methanol. The low-temperature separator 4 drained the gas goes FR withdrawals.

The temperature in the low temperature separator 4 is minus 30oWith the quality of gas into the pipeline, will comply with OST 51.40-93.

Fluid from the inlet separator for the production of gas condensate wells 1 through the control valve 12 is supplied to the three-phase separator first stage 5, in which the pressure is maintained equal to 7.5 MPa. The gas from separator first stage 5 is fed to the input of the low-temperature separator, water, together with water from the inlet separator for the production of gas wells 8, is displayed on recycling, and the condensate through the control valve 13 is supplied to the crystallizer 7.

The liquid from the lower part of the low-temperature separator 4 through the control valve 11 flows into annulus regenerative gas-liquid heat exchanger 9, where it cools the product gas wells, and then fed into the three-phase separator second stage 6.

Regenerative gas-liquid heat exchanger 9 allows the use of excess produced energy products gas-condensate fields, converted by throttling flow in excess cold accumulated in the condensate for cooling products gazowe separation. The condensate throttling valve, the controller 11 after the low-temperature separator 4 provides additional temperature reduction gas in a regenerative gas-liquid heat exchanger 9 and increase the efficiency of degassing of the condensate in a three-phase separator second stage 6. Odometery solution (BMP) of the three-phase separator second stage 6 is fed by a pump 14 to the input of the input separator for the production of gas condensate wells 1 and the condensation pressure of 4.0 MPa enters the degasser 7. Return BMP at the entrance of the inlet separator for the production of gas condensate wells 1, where the flow temperature is about 30oWith, can dramatically reduce the consumption of methanol on the implementation of the technology, because at higher temperatures a large portion of the methanol from the BMP from the low-temperature separator 4 is transferred into the gas phase and fed to the inlet of the regenerative heat exchanger 2 to protect it from hydrates. The gas from separator second stage 6 and the degasser 7 is supplied to the low-pressure inlet of the ejector 3, and unstable condensate from the degasser 7 is fed to the condenser or to install condensate stabilization.

The gas treatment unit, comprising an input separator, three-phase separators of the first and second stages and degasser, characterized in that the installation is further provided with series-connected input separator for the production of gas wells, regenerative gas-liquid heat exchanger, a throttle, the output of which is connected to the input of the low-temperature separator, and a valve-regulator, through which the lower part of the low temperature separator is connected to the input annulus regenerative gas-liquid heat exchanger, and the outlet annulus associated with three-phase separator second stage.

 

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