SU1414402A1 - Installation for initial discharge of stratal water - Google Patents

Abstract

The invention relates to the preparation of oil and water, can be used in the preliminary dehydration of oil and the preparation of water in oil fields, and reduces the technological losses of oil with a preliminary discharge of produced water while maintaining the quality of water treatment. A pressure reservoir is connected to the inlet pipe of the water-oil mixture of the installation, the lower level of which is from the upper level of the water cushion in the Low-pressure reservoir at a distance that provides the necessary pressure to overcome hydraulic resistance in the pipeline for water discharge by gravity. The upper level of the pressure tank is located at a distance from the upper level of the oil in the low pressure tank, providing a pressure not lower than the saturated vapor pressure of the produced oil. The pressure reservoir is connected to the low pressure reservoir by a pipeline with its connection point to the low pressure reservoir at a distance from the upper level of oil that provides pressure not lower than the saturated vapor pressure, and the branch pipe for the recovery of the prepared oil is connected to the connecting pipeline. 1 il. with SS cl

Description

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IchoPretenis- ui carries to the region: io; u Ptovk) of oil and water and can be used in the preliminary dehydration of oil and the preparation of water in oil fields.

The purpose of the invention is to reduce the technological losses of oil with a preliminary discharge of produced water while maintaining the quality of water treatment.

The drawing shows schematically the installation of preliminary discharge of formation water, a general view.

The installation of preliminary discharge of formation water consists of two reservoirs 1 and 2 or a group of reservoirs) of low and subsurface pressure, respectively. As a pressure reservoir can be used field horizontal sumps. Reservoir 2 of increased pressure has the inlet pipe 3 and is connected to a low pressure reservoir with an oil transfer pipeline pipe 4 with branches 5 and 6 and water 7 and gas pipe 8. Not with gas equalization system, with gas space end separation stage or through breathing valve with atmosphere. Low pressure tank 1 is equipped with a dispensing pipe 9 for water withdrawal, gas pipe 10 connecting gas space with gas equalizing system, respiratory 1 1 and a safety valve 12. The oil is withdrawn from the tanks by a pump 13. The lower level of the pressurized reservoir is from the upper level of the water cushion in the low pressure reservoir at a distance of Providing the pressure required to overcome the hydraulic resistance in the pipeline for water discharge by gravity, i.e.,

H, J B- IftН

- a distance from the lower level of the reservoir of increased pressure to the upper level of the water cushion in the reservoir of low pressure;

- pressure required to overcome hydraulic

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resistances in the pipeline connecting the water zones of high and low pressure tanks; yj is the density of water; y h - the density of oil. The upper level of the pressure reservoir (the oil pressure from the upper level of the oil in the low pressure reservoir is at a distance that provides a pressure not lower than the saturated vapor pressure of the produced oil, i.e.

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where H is the distance between the upper level of the pressure reservoir and the upper level of oil in the low pressure reservoir; P - saturated vapor pressure

oil;

Rd - atmospheric pressure. The installation works as follows.

Water oil to the mixture from the end separation unit through the inlet pipe 3 enters the reservoir 2 of increased pressure, where the mixture is divided into oil with a permissible content of droplet water and water with a specified content of droplet oil. In this case, water by gravity in the self-regulating mode enters the tank 1 for additional sludge, and the oil through pipe A and the branch 5 is pumped out by pump 13 for subsequent preparation. Compensation for non-uniformity of the flow and withdrawal of oil from reservoir 2 occurs due to the volume of reservoir 1 through branch 6. Thus, the bulk of the oil passes through a sealed system, which eliminates losses from this volume of light hydrocarbons. If emergency breakthroughs of gas take place with the water / oil mixture, it is diverted from pipeline via pipeline 8, preferably to the gas zone of the separator, at the terminal stage of separation.

In tank 2 of increased pressure, the processes of expulsion and boiling of oil are excluded, how it works. full volume- (pez of the gas space when firing is higher than the pressure of the saturation of the pump and ;;} gi.

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Claims (1)

The invention is a pre-discharge formation water containing a vertical cylindrical low-pressure tank with acceptance pipes, a pressure tank and a discharge pipe to which the oil zones of the tanks are connected, characterized in that, in order to reduce technological losses of oil, the pressure tank is placed in front of the low-pressure tank, the water zones of the tanks are interconnected by a pipeline, and the bottom of the high-pressure tank is located but from the upper water level is crawled quality oil and water due to the sealing equipment, which passes through the bulk of the low-pressure tank at a distance that ensures the flow of water by gravity.