RU2361641C1 - Tube separation installation - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention refers to equipment for oil producing industry, notably, to installations for separation water from products of oil wells. The installation consists of an inclined column and of pipelines connected to the column; the pipelines serve for supply of water-oil-gas mixture and for withdrawal of oil, water and gas. The pipeline for supply of mixture is connected to the column via the facility-damper made in form of a device for preliminary separation of water-oil-gas mixture equipped with branches of withdrawal of gas, water and oil, supplying, correspondingly, gas into the gas withdrawal pipeline, oil and water into the column. The outlet of the branch for drainage of water into the column is located above the outlet of the branch of oil supply into the column. The outlet of the branch of the water drainage is connected to an oil settling section of the column at the level of the upper level of fluid in the oil settling section. The inlet into the pipeline of oil withdrawal is situated at the level of the upper level of fluid in the oil settling section. The upper level of fluid in the oil settling section is maintained automatically, for example, by means of a hydro-measuring unit assembled on the pipeline of oil withdrawal. The outlet of the branch of oil supply is connected to the column at the level or below the lower level of oil in the column.

EFFECT: increased efficiency of installation.

1 dwg

Description

The invention relates to the field of equipment for the oil industry, and in particular to installations for separating water from oil well products.

Known pipe separation installation containing a pipe made of pipes with pipelines for supplying oil and gas mixture and the removal of oil, water and gas, while the column is made inclined, the supply pipe is connected to the inclined column at a distance equal to 0.2-0.25 length of the column, and its lower part is equipped with a pipeline for discharging free water connected to a gas outlet manifold, the column is located on the surface / USSR Author's Certificate No. 1482932, B01D 19/00, 06.23.1989 /.

The disadvantages of this installation are the lack of intensity of the process, the large size, it is able to separate the gas-liquid mixture into oil and water with a relatively low water content, the incoming oil and water are first mixed and then separated, which leads to an increase in sludge time and lower water quality.

Known pipe separation installation comprising an inclined column made of pipes, consisting of a water-sludge and oil-sludge sections, a pipeline for supplying oil and gas mixtures and pipelines for discharging oil, water and gas connected to the column, the pipeline for supplying oil-gas mixtures is connected to a soothing manifold that separates the oil-gas mixture into gas, oil and water, a stilling manifold is connected to the side surface of the column, a stilling manifold is straightforward, has the same diameter with an inclined column and an eccentric upper entrance of the gas-liquid mixture, and the outlet is additionally equipped with a gas outlet to the inclined column at a right angle to its axis, and the angle of inclination of the inclined column relative to the horizon is 4-15 ° (RU 2135886, F17D 3 / 14, 08/27/1999).

The disadvantages of this installation are:

- insufficient intensity of the process, since the incoming oil and water are first previously separated in a stilling reservoir, and then mixed again after entering the inclined column, which leads to an increase in settling time and lower water quality;

- large dimensions, since the stilling collector has the same diameter with an inclined column.

The closest technical solution, selected as a prototype, is a pipe separation installation containing an inclined column made of pipes, consisting of a water-sludge and oil-sludge sections, a pipeline for supplying oil and gas mixtures and pipelines for extracting oil, water and gas connected to the column, the pipeline for supplying oil and gas mixtures connected to a soothing collector, which provides for the separation of the oil-gas mixture into gas, oil and water, a soothing collector is connected to the side the surface of the column, inside the column below the outlet of the stilling collector, partitions are installed, open in the upper part, while the partition most remote from the inlet of the mixture is made higher than the height of the other partitions, with the formation of a pocket between this partition and the outlet of the stilling collector for accumulating incoming in the oil column, and a water discharge pipe connected to the bottom of the water-sludge section of the column is connected to the stilling collector (RU 2291734, B01D 19 / 00, 01.20.2007).

The disadvantages of this installation are the insufficient intensity of the process and the quality of separation, since the incoming oil and water are first pre-separated in a still reservoir, and then mixed again after entering the inclined column, which leads to an increase in settling time and lower water quality.

The task at hand is to increase the efficiency of the pipe separation plant by increasing the quality and intensity of the separation process.

The problem is solved in that in a pipe separation installation containing an inclined column and pipelines for supplying an oil and gas mixture and an outlet for oil, water and gas, the pipeline for supplying an oil and gas mixture is connected to the column through a stilling device equipped with a water discharge pipe, also connected with a column, the calming device is made in the form of a device for preliminary separation of the oil and gas mixture, equipped with additional gas and oil discharge pipes, feeding with responsibly gas in gas discharge conduit, and oil - in a column, wherein the exit water discharge pipe is located above the column outlet oil supply pipe to the column. The outlet of the water discharge pipe is connected to the oil sludge section of the column at the level of the upper liquid level in the oil sludge section. The entrance to the oil drainage pipeline is located at the upper level of the liquid in the oil sump section. The upper liquid level in the oil sludge section is maintained automatically, for example, by means of a water seal installed on the oil drain pipe. The outlet of the oil supply pipe is connected to the column at or below the lower oil level in the column.

The supply of the oil and gas mixture through the pipeline for supplying the oil and gas mixture to the device for preliminary separation of the oil and gas mixture into the previously separated gas, oil and water allows preliminary separation of the oil and gas mixture into the previously (poorly) separated water, oil and gas, which is subsequently due to separate entering pre-separated oil and water can increase the intensity of the process. Additionally, the removal of the pre-separated gas from the pre-separation device allows to reduce the length of the column by reducing the volume of gas entering it, which also increases the intensity of the process. As a device for preliminary separation of the oil-gas mixture into previously separated water, oil and gas, you can use, for example, a separation unit (RU 2285555, B01D 19/00, 10/20/2006) with a reduced residence time of the oil-gas mixture in it.

The sign “the outlet of the water discharge pipe (pre-split) to the column is located above the outlet of the oil supply pipe (pre-split) to the column” allows the counter flow of pop-up oil and settling water to be arranged in the column. In this case, a hydrophobic layer of oil is created, passing through which, the water is additionally purified from oil products. All this provides an increase in the intensity of the process.

Connecting the outlet of the water discharge pipe (previously divided) to the oil sludge section of the column at the level of the upper liquid level in the oil sludge section allows to increase the residence time of the water in the column and the thickness of the hydrophobic layer of oil passed by it, which ensures an increase in the quality of separation.

The location of the entrance to the pipeline for the removal of oil from the column at the level of the upper liquid level in the oil sump section allows you to drain oil from the uppermost layers, where it is most dehydrated, which ensures the quality of separation and increase the intensity of the process.

Automatic maintenance of the upper liquid level in the oil sump section, for example, by means of a water trap installed on the oil drain pipe, allows the organization of an established process, which ensures the quality of separation and an increase in the intensity of the process.

The connection of the outlet of the pre-separated oil supply pipe to the column at or below the lower oil level in the column allows the passage of the pop-up oil through the entire hydrophobic oil layer, which ensures the quality of separation. Additionally, when a pre-divided oil passes through a part of the water layer, part of the water is discharged from the pre-separated oil, which also provides an increase in the intensity of the process.

The proposed pipe separation installation is shown in the drawing.

The pipe separation installation includes a pipeline for supplying 1 oil-gas mixture connected to a device for preliminary separation of 2 oil-gas mixture into water, oil and gas. The device for preliminary separation 2 is connected by discharge pipes of previously separated water 3 and oil 4 to a column 7, including a water-settling 8 and an oil-settling 9 section. A gas outlet pipe 5 with a valve 6 is connected to the upper part of the preliminary separation device 2 and a gas discharge pipe 15 is connected to the gas discharge pipe 15. A water discharge pipe 10 with a valve 11 is connected to the lower bottom part of the water separation section 8 and an oil discharge pipe is connected to the oil separation section 9 of column 7 12 with a valve 13, and to the upper part of the oil sludge section 9 is a gas outlet pipe 15 with a valve 14.

Pipe separation installation operates as follows. Through the supply pipeline 1, the oil-gas mixture enters the preliminary separation device 2, in which the oil-gas mixture is preliminary separated into water, oil and gas previously separated. The pre-separated water through the discharge pipe 3 enters the oil sludge section 9 of the column 7, and the pre-separated oil through the supply pipe 4 enters the oil sludge 9 or water section 8 of the column 7. The pre-separated gas from the preliminary separation device 2 enters the gas outlet pipe 5 and from there, to the gas discharge pipe 15. The removal of the main part of the gas from the oil-gas mixture to the entrance to the column 7 allows to reduce the working volume of the column 7. Since the previously separated water enters the column 7 into Higher than the previously separated oil, and the oil density is less than the density of water, then in the oil layer (hydrophobic layer) between the places of introduction of the previously separated oil and water into the column, counter flows of settling water and pop-up oil arise. At the same time, oil and water are cleaned: when the previously separated oil comes up, water is released from it and settles down; and when water settles in the hydrophobic layer of oil, oil is separated from the water. The gas remaining in the pre-separated oil and water is released in column 7, accumulates in its upper part and is discharged to the gas discharge pipe 15. Water from the water-sludge section 8 of column 7 is discharged through a water drain pipe 10. Oil from oil-sludge section 9 of column 7 is discharged through a pipeline oil removal 12. Due to the constant removal of oil from the column 7 is a constant update of the oil of the hydrophobic layer. Valves 11 and 13 are used to control the drainage of water and oil, respectively, from the column 7. Valves 6 and 14 are designed to regulate the discharge of gas from the device for preliminary separation 2 and column 7, respectively.

Thus, the claimed pipe separation unit allows to increase the quality of separation and the intensity of the process.

Claims (5)

1. A pipe separation installation comprising an inclined column and pipelines for supplying an oil and gas mixture and an outlet for oil, water and gas, the pipeline for supplying an oil and gas mixture connected to the column through a stilling device equipped with a water discharge pipe also connected to the column, characterized in that the calming device is made in the form of a device for preliminary separation of the oil-gas mixture, equipped with additional nozzles for the removal of gas and oil, supplying, respectively, g az - in the gas discharge pipeline, and oil - in the column, and the outlet of the water discharge pipe into the column is located above the outlet of the oil supply pipe into the column. 2. The pipe separation installation according to claim 1, characterized in that the outlet of the water discharge pipe is connected to the oil sludge section of the column at the level of the upper liquid level in the oil sludge section. 3. The pipe separation unit according to claim 1, characterized in that the inlet to the oil discharge pipe is located at the upper level of the liquid in the oil sump section. 4. The pipe separation unit according to claim 1 or 2, characterized in that the upper liquid level in the oil sump section is maintained automatically, for example, by means of a water seal installed on the oil discharge pipeline. 5. The pipe separation unit according to claim 1, characterized in that the outlet of the oil supply pipe is connected to the column at or below the lower level of the oil in the column.