SU969283A1 - System for collecting and preparing crude oil - Google Patents

Description

(54) OIL COLLECTION AND PREPARATION SYSTEM

one

The invention relates to systems for the collection and treatment of oil, its stabilization, and can be applied in the oil, gas, oil refining and petrochemical industries to carry out processes of efficient separation of oil from gas, stabilization of oil and oil products.

The closest to the proposed technical essence and the achieved result is the oil collection and treatment system, which includes wells, automatic group metering units, a reagent supply unit, a separator of the first stage of separation with gas extraction, a preliminary water discharge device with gas extraction, a heater, a hot separation unit, a recirculation pipeline for the separated water, a buffer tank, and a pipeline for pumping the dehydrated desalted oil to the central collection point 1.

While increasing the productivity of the known installations, the existing gas separators do not provide a sufficient depth of separation of free gas from oil.

and hence the effective operation of electro-dehydrators.

The purpose of the invention is the preparation of oil with the preservation of the lightest most valuable hydrocarbon components using

 -electric dehydrators, intensification of the process of separation of gas from oil, with its utilization and preservation, so to speak, of these components.

The goal is achieved by the fact that

10 oil collection and treatment system, including wells, metering units, reagent supply unit, first stage separation separator, preliminary water discharge unit, heater, hot separation unit, electric dehydrator, separated water recirculation pipeline, buffer tank, pipeline for pumping dehydrated desalinated water oil, is equipped with a multi-hydrocyclone with a gas extraction line, placed between the heater and the dehydrator electro-20 and connected to the hot separation unit.

In this case, connect the multihydrocyclone and the hot separation unit in series or in parallel. The system is also equipped with an injector connected to a gas line from a multi-hydrocyclone and with a pipeline for pumping dehydrated and desalted oil. The drawing shows a process flow diagram of an oil treatment system with the preservation of light hydrocarbons. The system consists of a well 1, an automated metering unit 2, a first stage separator 3, a reagent supply unit 4, a preliminary water discharge device 5, a line 6 for pumpless system operation, a pump 7, a tubular preheater 8, a multi-hydrocyclone 9, a separator 10, a hot stage separation, the electric dehydrator 11, the buffer tank 12, the pump 13 for pumping out the product, the feed pipelines 14, the injector 15; reference designations: 16 - gas of the first separation stage, 17 - gas extraction from the preliminary water discharge unit, 18 - gas of the hot separation stage with the equalizer line of the electric dehydrator, 19 - water to the wastewater treatment and purification installation, 20 - water to mix with production wells, 21 - oil supply to the central collection point. The system works as follows. Products from wells 1 are extracted from reservoirs under pressure at the wellhead 15–20 MPa (1.5–2 MPa, temperature 20 ° C and with a gas content of 80) are fed to automated group metering units 2 (for example, “Satellite-40-B ), where automatic measurement of well production is performed. Next, in a stream of oil using dispensers (for example, the RPN-2-30 pump) is fed through a mixer of a special design (for example, BashNIPIneft) a demulsifier reagent (for example, disolvan 4411) in an amount of 40-50 g / ton. Water from the dehydrators containing the residual amount of the demulsifier and heat is fed into this oil stream. Under the action of turbulent flow in the pipeline, well production is intensively mixed with water and reagent, as a result of which the reagent-demulsifier is delivered to the surface of the reserving shells of individual oil and gas droplets, causing the destruction of these shells, and hence the emulsion and foam itself. The mixture of well production goes further to the separator 3 of the first stage, where under the pressure of 7 MPa (0.7 MPa) the gas is separated from the oil. This gas is sent to gas processing plants. Oil with a residual gas content of 8–10 and a water content of up to 30%, with a temperature of 25–30 ° C enters the preliminary water discharge unit 5, where water is separated from oil and the residual gas is released under a pressure of 6 MPa (0.6 MPa). The water content in this device is reduced to 11 - 15%, and gas - to 7-8. The separated water is diverted to the water treatment and injection system, and the gas to the gas processing plants. Next, the pressurized oil wellhead or pump 7 (if the pressure is not enough) is directed to tubular heaters 8, where it is heated to 40-60 ° C. The pressure at the outlet of these heaters is 4-5 bar (0.4-0.5 MPa). A stream of gas-oil-emulsion heated to 40-60 ° C enters a three-product multihydrocyclone 9, in which the heaviest (saline) water is separated from oil and light volatile hydrocarbon components are released (including gas dissolved in oil). The separated water in the form of stream 19 is fed to the system of sewage treatment and treatment, and light volatile components are collected in a collection of a gas-oil multihydrocyclone mixture. The deeply degassed oil is fed to the And electric dehydrator, where deep dehydration and desalting of oil are carried out. The flow of oil with a water content of up to 0.2 wt. % and salts up to 40 mg / l are collected in a buffer tank 12. and pump 13 is fed to the active nozzle of the injector 15, and the mixing chambers of the latter are connected by pipeline with a collection of a gas-oil mixture of a multi-hydrocyclone. As a result, this mixture is continuously sucked off by an injector in the pipeline transportation system. The largest amount of gas is accumulated due to evaporation and in the Fischer's electric dehydrator chamber. Successful operation of the latter is carried out at the expense of a constant suction of gas from this chamber by the injector 15, which makes it possible to increase the productivity of the known system by 30%. The flow of the gas-water emulsion heated to 40-60 ° C (in the heater) can be divided into two parts, one of which goes through the three-productive multi-hydro cyclone 9 and further in accordance with the foregoing. The other part is fed to a separator 10 for hot separation. The gases separated in this separator along with the gases from the electric dehydrator 11 are constantly sucked off by the injector 15. The oil flow from the separator 10 is mixed with the oil flow from the three-product multihydrocyclone and fed to the electric dehydrator 11, where it is deeply dehydrated and the oil is desalted. The movement of this flow - oil further coincides with the movement of the first flow. This makes it possible to increase the performance of the existing system by 40%. The notoK heated to 40-60 ° C in a tubular heater 8 of a gas-water emulsion can be sent to a three-productive multi-hydro cyclone 9, where water is separated from oil and light volatile hydrocarbon components are separated in one process unit. Separated from the water in the form of a stream 19 water enters the system of water purification and injection into productive horizons. The oil enters the gas separator 10 where further separation of the gases from the oil is carried out. The degassed oil enters the dehydrator 11, where it is deeply desalted and dehydrated. Such oil is collected in the buffer tank 12 and pump 13 is supplied as an active agent to the injector 15. The latter sucks the gases through a line connected to the injector mixing chamber from the gas-oil mixture collector three-productive multihydrocyclone and from the gas separator 10, as well as from the Fischer electric dehydrator chamber. This makes it possible to deepen the process of oil degassing. The gas content at the outlet of the buffer tank 12 does not exceed 1.2-1.5 oil.

The proposed separation system makes it possible to prepare the oil while preserving the lightest, most valuable hydrocarbons, increase the productivity of existing oil treatment plants, and improve the quality of oil due to the separation of water and mechanical impurities from oil in the degassing process in a multihydro cyclone. All this leads to an intensification of the process of collecting and preparing oil.

Claims (4)

1. Oil collection and treatment system, including wells, automated group metering units, reagent supply unit, first stage separation separator with gas extraction, water pre-discharge device with gas extraction, heater, hot separation unit, electric dehydrator, whose gas line is connected to the gas line of the hot separation unit, the recirculation pipeline for the separated water, the buffer tank and the pipeline for pumping the dehydrated desalted oil to the central collection point, In order to prepare oil while preserving light hydrocarbons and intensifying the process of separating gas from oil, the system is equipped with a multi-hydrocyclone with a gas extraction line located between the heater and the electric dehydrator and connected to the hot separation unit. 2. A system according to claim 1, wherein the multi-hydrocyclone and the hot separation unit are connected in series. 3. The system according to claim 1, wherein the multi-hydro cyclone and the hot separation unit are connected in parallel. 4. The system according to claim 1, characterized in that it is provided with an injector connected with a multi-hydrocyclone gas extraction line and with a pipeline for pumping dehydrated and desalted oil. Sources of information taken into account in the examination 1. Production, collection and preparation of oil and gas in fields in Western Siberia. Proceedings of SibNIINP, vol. II, Tyumen, 1978, p. 81-85 (prototype). 17