RU34393U1 - System for the preparation and transportation of gas and oil wells - Google Patents

Description

System for the preparation and trans-sorting of gas and oil well products

The utility model relates to the field of preparing oil, condensate and gas from oil and gas condensate fields and transporting them to a consumer, for example, a gas processing plant (GPP).

Known systems for the preparation and transportation of oil, condensate and weathering gases, including prefabricated oil and condensate collectors, an oil and condensate treatment unit, pipelines for supplying a prepared mixture of oil and condensate and weathering gases to the gas processing plant. G.S. Lutoshkin. Collection and preparation of oil, gas and water. M., "Nedra, 1973, p. 13.

Oil and condensate from field production, collection and treatment facilities after initial preparation are sent to the general reservoir, an oil and condensate treatment unit, where they are degassed, dehydrated and desalted. Weathering gas is sent to a consumer through a separate pipeline.

In the early and main stages of the development of oil and gas condensate fields, reservoir pressures are large enough to ensure the transportation of weathering gases of oil and condensate to the consumer. At a certain point, the own pressure is not enough to supply products to the consumer with a given flow rate and then there is a need to increase the gas pressure through the use of well-known technical means, for example, ejector installations.

Closest to the claimed for the purpose and set of specific features is the currently used at the Orenburg oil and gas condensate field system for the preparation and transportation of gas and oil wells Technological regulations for the operation of the complex gas treatment unit No. 14. TR-1-14-2002. The system includes a gas treatment unit (UPG) with inlet gas pipelines of low and high pressure, to which gas wells with low and high reservoir pressures are connected, respectively, and an oil treatment unit (UPG) with inlet and outlet pipelines. The gas treatment unit is equipped with a high-pressure outlet gas pipeline directly connected to the consumer (GPP) and a low-pressure gas pipeline connected to a booster compressor station (DCS). The output pipeline from the oil treatment unit is connected to the booster compressor station.

The gas well products, depending on the value of the reservoir pressure, are sent to the inlet pipelines of the low and high pressure, respectively, and fed to the gas treatment unit. At the installation, the method of low-temperature separation is the drying and initial preparation of gas for transport. Separated high pressure gas

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the corresponding gas pipeline is sent directly to the consumer (gas processing plant), and low-pressure gas is sent through the booster compressor station.

Oil well products go to the oil treatment unit, where it is degassed and dehydrated. Oil from the oil separator is discharged into the oil pipeline, which also discharges unstable condensate from the gas treatment unit. The mixture of oil and condensate enters the booster compressor station for further transportation to the gas processing plant. In order to reduce the pressure in the oil separator as much as possible, the pressureless weathering gas from the oil separator is discharged to the gas treatment unit (before the second separation stage) through a gas-gas ejector, where it is compressed to the pressure necessary for transportation through the connecting gas pipeline to the gas treatment plant. As the active gas for the ejector, a high-pressure gas of the gas treatment unit is used

This technological scheme is effective for ensuring design levels of gas, oil, condensate production and preparation in accordance with the technical specifications to a certain value of reservoir pressure that falls during the development of the oil and gas condensate field.

A disadvantage of the known system for preparing and transporting gas and oil well products is a decrease in the level of hydrocarbon production due to a decrease in oil well flow rates resulting from a decrease in the efficiency of the ejector of the gas treatment plant. To ensure the efficiency of its operation, an ejection gas with a high pressure (not less than 6.4 MPa) is required, which is impossible due to a significant drop in reservoir pressure without reductions in gas production.

The objective of the claimed utility model is to increase the level of hydrocarbon production by increasing the productivity of oil wells and creating conditions for the utilization of low-pressure gas, weathering oil and condensate.

The problem is solved in that in the system for the preparation and transportation of gas and oil wells, including an oil treatment unit with inlet and outlet oil pipelines, a gas treatment unit with inlet and outlet low and high pressure gas pipelines, while the low pressure outlet gas pipeline is connected to the consumer through booster compressor station, an oil booster station with pipelines for the exit of oil and weathering gases is installed at the oil pipeline of the oil treatment unit, at m last is connected to the outlet pipeline gas treatment installation of low pressure before the booster compressor station.

The technical result obtained in this case consists in providing an opportunity to create additional depression on the formation and increase the flow of oil into the well by sequentially reducing the pressure in the oil collection and treatment system (receiving capacity of the booster pump station oil separator UPN - the mouth of the oil well).

in addition, the reduced pressure in the receiving tank of the booster pump station (BPS) ensures maximum degassing of not only oil but also gas condensate entering the BPS from the gas treatment unit. This ensures the necessary quality of preparation and transportation of hydrocarbons (mixture of unstable condensate and oil) supplied to the gas processing plant.

The drawing shows a diagram of a system for the preparation and transportation of gas and oil wells.

The system contains gas 1 and oil 2 wells, an oil treatment unit 3 with an inlet 4 and an outlet 5 oil pipelines, a gas treatment unit 6 with an inlet 7, 8 and outlet 9.10 low and high pressure gas pipelines, a booster pump station 11 with oil outlet pipelines 12 and weathering gases 13. The low-pressure outlet gas pipe 9 is connected to the consumer 14 (GS) through the booster compressor station 15. The gas treatment unit is equipped with a condensate pipe 16 connected to the CSN and a receiving pipe for the weathering gas ejector 17 from the mouth New oil treatment 3.

The production of gas wells 1, depending on the value of the reservoir pressure, is directed to the inlet pipelines 7, 8 of low and high pressure, respectively, and is supplied to the gas treatment unit 6. At the installation, the gas is dried and the gas is initially prepared for transport using the two-stage two-stage separation method. The separated high-pressure gas through the gas pipeline 10 is sent directly to the consumer 14 (GS), and the low-pressure gas through the gas pipeline 9 through the booster compressor station 15. The condensate released from the gas through the condensate pipeline 16 is sent to the booster pump station 11.

The production of oil wells 2 enters through oil pipeline 4 to the oil treatment unit 3, where oc) it is degassed and dehydrated in an oil separator (not shown in the diagram). Oil from the oil separator is discharged into the oil pipeline 5, which is connected to the booster pump station 11, consisting of a receiving tank and a pump. The low-pressure weathering gas from the UNN oil separator via pipeline 17 is diverted to the gas preparation unit (before the second separation stage) through a gas-gas ejector to reduce the pressure in the oil separator as much as possible, where it is compressed to the pressure necessary for transportation through the connecting gas pipeline at GSH. As the active gas for the ejector, a high-pressure gas of the gas treatment unit is used.

The oil and gas condensate received at the booster pump station 11 are mixed in the receiving tank and, after degassing, by means of a pump; they are pumped directly through the pipeline 12 to the consumer 14. The weathering gases of oil and condensate from the receiving tank are discharged through the pipe 13 to the low pressure gas pipeline 9 before the booster compressor station . As a result of utilization of low-pressure weathering gases in

a gas pipeline connected to the first compression stage of a compressor station with a pressure of 1.5 - 1.7 MPa, the pressure decreases sequentially in the receiving tank, oil separator and directly at the wellhead, which allows you to create additional depression on the formation in order to increase production of oil wells .

Thus, the use of the proposed utility model makes it possible to measure the share of oil produced at the installation in the total volume of liquid hydrocarbons sent to the consumer, to maximize the use of all available reserves for separating and utilizing weathering gases from oil and condensate flows at each link of the process chain from the well to the plant.

Claims (1)

A system for preparing and transporting gas and oil well products, including an oil treatment unit with inlet and outlet oil pipelines, a gas treatment unit with inlet and outlet low and high pressure gas pipelines, wherein the low pressure outlet gas pipeline is connected to the consumer through a booster compressor station, characterized in that a booster pump station with oil and weathering gas outlet pipelines has been installed at the oil pipeline of the oil treatment unit, while the latter is connected nen with the low pressure outlet gas pipeline of the gas treatment unit in front of the booster compressor station.