RU2229022C2 - Device for preparing water on fields - Google Patents

Abstract

FIELD: oil extracting industry. SUBSTANCE: device has technological capacity with pipeline for supplying cleaning water and with pipelines for diversion of gas, water and oil. Lower part of technological capacity in device is separated by walls onto accumulating zone and drop off zone, and central detention zone. Hydrocyclone is placed in the latter with its tangential input oriented downwards. Said input is connected to pipeline for supplying water to be prepared. EFFECT: increased productiveness due to more admixtures separation from waste water accepted for cleaning. 3 cl, 1 dwg

Description

The invention relates to systems for collecting and preparing oil and water in oil fields.

A known installation [1] for purification of commercial (oily) water in the fields, consisting of a settling tank, in which there is a distributor connected to a pipeline through which wastewater is supplied, a compartment for the accumulation and discharge of oil or water-oil emulsion, a sensor and a level regulator water.

The disadvantages of the installation are long sucks and low productivity.

The technical challenge facing the invention is to increase the productivity of the installation due to a more intensive separation of impurities from the wastewater entering the treatment.

To solve the problem, the installation for water treatment at the fields, containing a technological tank with a pipeline for supplying purified water and pipelines for the removal of gas, water and oil, is additionally equipped with a hydrocyclone, and the lower part of the technological tank is divided by partitions into a zone of accumulation and discharge of water, an accumulation zone and oil discharge, and the central settling zone, in which the hydrocyclone is installed with a tangential inlet downward, while the tangential inlet of the hydrocyclone is connected to a pipeline for supplying intramural water, while the central pipe is connected to a tangential input accumulation zone and discharge of oil.

To automate the operation, the installation is equipped with a liquid level regulator in the settling zone, the actuator of which is installed in the pipeline supplying water for purification, and in the zone for accumulating and discharging oil, upper and lower level sensors are installed to control the oil pumping pump.

For the joint preparation of the water coming under high (Cenomanian) and low (oil-containing commercial) pressures, a mixer (jet pump) is installed in the pipeline for supplying purified water.

The invention is illustrated by the drawing, which shows a diagram of the installation for the preparation of water in the fields.

The installation for preparing water in the fields consists of a horizontal technological tank 1, the upper part of which is a gas accumulation zone 2, and the lower part of the technological tank, in which liquid is accumulated, is divided by partitions 3 and 4 into a water storage and discharge zone 5, a central settling zone 6 and zone 7 of the accumulation and discharge of the oil-water emulsion or oil (depending on the stability of the emulsion). Technological tank 1 is equipped with a hydrocyclone 8, which is installed in the settling zone upside down so that the tangential input 9 extends below the tank 1.

During the operation of hydrocyclone 8, three zones are formed in it: the lower - separated water, the middle - separated oil and the upper - separated gas. The lower zone of the hydrocyclone through the openings 10 communicates with the settling zone of the tank below the liquid level in it, and the middle zone of the hydrocyclone through the central pipe 11 of the tangential input 9 of the hydrocyclone 8 and the bypass pipe 12 communicates with the zone 7 of the accumulation and discharge of oil.

The technological tank 1 is equipped with a direct-acting level regulator, the float 13 of which communicates with its settling zone 6, and the actuator (spool valve) 13a is installed in the pipeline supplying water to the technological tank. Sensors 14 and 15 of the upper and lower levels are installed in the technological tank 1 in zone 7 for the accumulation and discharge of oil.

The tangential input 9 of the hydrocyclone 8 is connected to the pipeline 16, which supplies water to the processing tank 1 for cleaning. Pipeline 17 for draining oil and pipelines 18 and 19 for draining water and gas for further disposal depart from the tank.

The drawing shows the installation for the joint preparation of the Cenomanian and commercial (oily) water. To achieve this, a mixer 20 is installed in the supply pipe 16.

Cenomanian water, containing free gas and mechanical impurities, is pumped through a pipe 21 to a jet mixer 20 under pressure from a well pump, into which commercial water is sucked from a field oil treatment unit (not shown) through a pipe 22.

From the output of the mixer through the spool of the regulator 13 of the liquid level, the mixed stream through the pipe 16 enters the hydrocyclone, in which it is intensively separated. Water with solids through the holes 10 is discharged into the settling zone 6 of the tank 1. Oil through the Central pipe 11 and the pipe 12 is discharged into the zone 7 of the accumulation of oil. Part of the emulsion oil is floated by gas and accumulates on the water surface in the settling zone 6, in which further separation occurs under the influence of gravity, while the oil is transferred to the accumulation and discharge zone of the oil-water emulsion through calibrated holes 23 in the upper part of the partition 4, and water through the slot the gap 24 in the partition 3 flows into the zone 5 of accumulation and discharge of water.

Due to the fact that the produced water contains a small amount of oil, up to about 1000 mg / l, it is very difficult to completely separate it from water, especially since the oil is in the form of a thin film in water, then in zone 7, as a rule , waterlogged oil will accumulate.

Purified water by pump 25 through a fine filter 26 is fed into the reservoir pressure maintenance system in the field.

Due to its insignificant amount, gas is supplied for dispersion or for combustion.

The separated flooded oil pump 27 periodically at the command of sensors 14 and 15 are sent to the oil treatment unit.

The amount of water discharged from the settling zone 6 to the oil accumulation zone 7 depends on the relative position of the float of the regulator 13 and the calibrated holes 23.

The central pipe 11 of the hydrocyclone 8 should be located below the surface of the liquid at a distance of an open “funnel”, which draws a film of oil into this pipe.

To clean from accumulating impurities, the tank is equipped with flushing pipelines 28 and 29.

The installation provides water purification from mechanical impurities and reduces the oil content to a value not exceeding 10 mg / l, which makes the Cenomanian and commercial water suitable for reservoir pressure maintenance systems.

Sourse of information

1. G.S. Lutoshkin. Collection and preparation of oil, gas and water. M., Nedra, 1983, p. 170-172, Fig. 75.

Claims (3)

1. Installation for the preparation of water in the fields, containing a technological tank with a pipeline for supplying purified water and pipelines for the removal of gas, water and oil, characterized in that it is equipped with a hydrocyclone, and the lower part of the technological tank is divided by partitions into a zone of accumulation and discharge of water, the zone of accumulation and discharge of oil and the central settling zone, in which the hydrocyclone is installed with a tangential inlet downward, while the tangential inlet of the hydrocyclone is connected to the pipeline for supplying purified water, and cent cial tangential input nozzle is connected to the accumulation zone and discharge of oil. 2. Installation according to claim 1, characterized in that it is equipped with a liquid level regulator in the settling zone, the actuating mechanism of which is installed in the pipeline supplying water for purification, and in the zone for accumulating and discharging oil, upper and lower level sensors are installed to control the pump pumping oil. 3. Installation according to claim 1 or 2, characterized in that a mixer is installed in the pipeline for supplying the water to be treated, for the joint supply of water coming under high and low pressures to the preparation.