RU2369425C1 - Tubular phase separator - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: tubular casing accommodates lengthwise flute-like partition arranged at the angle of 3 to 5 degrees to horizon, right above the casing axis. Grate designed to destruct water-oil emulsion globules is attached to aforesaid flute lower end face, at the angle exceeding that at which aforesaid grate is arranged relative to horizon. Branch pipe to intake gas-water-oil emulsion is arranged at upper part of pipe, above flute upper end face, the flute being fitted with clearance with respect to casing end face. Gas discharge branch pipe is locates above the level of the former branch pipe. Aforesaid branch pipes are separated by a baffle jointing the flute upper end face with pipe upper pipe. Pipe lower part accommodates branch pipe designed to take off dewatered oil and that to take off water located below the level of the former. Crosswise separating webs are arranged between aforesaid branch pipes. Casing comprises fluid level indicators.

EFFECT: higher efficiency of oil dewatering due to improved phase separation.

3 cl, 1 dwg

Description

The invention relates to the field of dehydration of oil in the oil fields.

 Known tube phase divider, including an inclined column with an emulsion-receiving manifold containing an emulsion inlet pipe, a pipe installed in the lower part of the column and containing a water collection pipe, drain pipes connecting the column to the pipeline, gas and oil collectors, each of which equipped with an outlet pipe. The inclined column is made in at least two, arranged at an angle to each other and with the same inclination relative to the horizontal plane of the pipes with a common emulsion-receiving manifold, which is made below the location of the outlet pipes of the gas and oil discharge manifolds, and the emulsion inlet pipe is made below the level of the outlet pipe of the oil drain manifold is not less than 1 m. In this case, the pipe for the input of the emulsion-receiver collector emulsion is installed tangentially, the drain pipes Execute the vertical, and the gas exhaust manifold is equipped with a gas separator. The pipes of the inclined column and drain pipes are made with the same diameter. (RF patent No. 2134607, MKI B01D 19/00, B01D 17/02, 08.20.1999.)

A disadvantage of the known device is the low efficiency of oil dehydration, which is explained by the small surface of gas evaporation from the emulsion and the absence of a mechanism for the destruction of globules of oil-water emulsions forming an interphase layer.

The closest to the claimed device in technical essence is a pipe separator with associated oil and water extraction, consisting of a horizontally located pipe, in the upper part of which there are pipes for oil and gas, in the bottom - pipes for water drainage, and inside - dividing transverse partitions , to each of which a vertical wall is pivotally attached, connected to a mechanism for regulating the selection of oil and water. (Aut. Certificate. No. 488595, MKI B01D 17/02, C10G 33/06, 10.25.75. Prototype.)

A disadvantage of the known device is the difficulty of selecting dehydrated oil without trapping water, on the mirror of which the oil layer is insignificant along the entire length of the horizontally located pipe. In addition, the hinged attachment of vertical walls to connect with the mechanism for regulating the selection of oil and water leads to a complication of the design without increasing the efficiency of the oil dehydration process.

The problem solved by the invention is to increase the efficiency of oil dehydration.

The task is achieved due to the fact that in the tube phase divider, which includes a housing in the form of a pipe with dividing transverse partitions, a gas-oil-oil emulsion inlet pipe, a gas outlet pipe located in the upper part of the pipe, a water extraction pipe located in the lower part of the pipe and a sampling pipe dehydrated oil, the casing is installed at an angle of 3-5 ° to the horizon, equipped with a longitudinal partition in the form of a gutter installed with a gap relative to the upper end of the casing, not more than 1/3 of the pipe length and size above its axis, at the lower end of which there is a device for breaking globules of oil-water emulsion, and above the top there is a pipe for introducing gas-oil-oil emulsion, which is located in the upper part of the pipe below the level of the gas outlet pipe and is separated from it by a partition connecting the upper end of the gutter with the upper part of the pipe, and the pipe for the selection of dehydrated oil is located in the lower part of the pipe above the level of the pipe for water extraction, and the dividing transverse partitions are located in the lower part of the pipe between the pipe the selection of dehydrated oil and the pipe of water extraction, one of which separates the pipe for the selection of dehydrated oil, is mounted on the lower part of the pipe with a gap relative to the lower surface of the gutter, and the others are installed with a gap between the lower part of the pipe and the lower surface of the gutter.

A device for destroying globules of a water-oil emulsion is made in the form of a lattice mounted on the lower end of the gutter at an angle greater than the angle of inclination of the gutter.

It is advisable that the housing was provided with liquid level indicators mounted on its ends.

The location of the housing of the pipe phase divider is inclined to the horizon at an angle of 3-5 ° and the installation of a longitudinal partition in the form of a gutter above its longitudinal axis prevents contact of the three selected phases: gas, oil and water.

The gas-oil-water emulsion fed to the elevated part of the gutter flows down the gutter to a length of 1/3 of the length of the body. In this case, the surface of the flowing emulsion increases and opens repeatedly and the gas is actively separated from the gas-oil emulsion. In the process of emulsion arrival, due to the inclination of the housing between the lower surface of the gutter, the end of the housing, the partition separating the inlet port of the gas-oil emulsion and the outlet pipe of gas, and the surface of the gas-oil contact, a gas channel is formed, expanding in the direction of the gas to its outlet pipe. Here, the gas, as a result of a decrease in the speed of movement, is purified from the dropping liquid carried away by its stream from the zone of the device for breaking globules of the oil-water emulsion, and after that it is removed from the pipe divider to the consumer.

Gas-oil-water emulsion, when draining along the gutter, acquires free fall energy, its speed increases. As a result, the conditions of impact fracture are created for the integrity elements of the armor shells of globules, which are the aqueous phase coated with a thin film of liquid hydrocarbons with mechanical impurities adsorbed on their surface. In this case, the aqueous phase is freed from the shells, as a result, the oil is effectively dehydrated. The angle of inclination of the pipe 3-5 ° to the horizon was determined empirically and confirmed by testing the pilot installation in the field conditions of the Mishkinsky field and on an industrial scale at the Ludoshursky oil field. If the pipe is inclined less than 3 °, the flow rate of the gas-oil emulsion is small, therefore, the flow regime of the emulsion through the trough is close to laminar, and gas separation is not effective. Due to the small difference in the angle of incidence of the emulsion on the lattice, the destruction of globules is partially carried out. In dehydrated oil, a water content of more than 2% is observed. At an angle of inclination of the case of more than 5 °, the speed of the emulsion along the trench is high, and the gas does not have time to separate and passes into the oil dehydration zone in the pipe, where it captures drops of water from the destroyed globules and brings the liquid to the mirror. In dehydrated oil, a water content of more than 6% is observed. The angle of inclination of the installation of the lattice for the destruction of the globules of the oil-water emulsion exceeds the angle of inclination of the trough, which contributes to an increase in the energy of the emulsion's fall. The length of the gutter should not exceed more than 1/3 of the length of the body, since with a longer length the lattice for the destruction of the globules of the oil-water emulsion will be flooded with dehydrated oil, and the destruction of the globules will not occur.

The transverse partitions located in the lower part of the pipe between the dehydrated oil extraction pipe and the water pipe, provide additional stepwise purification of oil from water and separation of the purified water and oil phases, since oil gradually flows through the upper section of the transverse partitions, and the water flows over gaps partitions with the bottom of the pipe. At the same time, the water phase, calming down and additionally clearing of oil products, freely flows to the water intake pipe, since it is below its level.

Thus, the technical result of the invention is to increase the efficiency of oil dehydration by improving the conditions of phase separation.

The invention is illustrated in the drawing, which shows a tube phase divider.

The tube phase divider consists of a housing 1 in the form of a pipe with an inclination to the horizon of 3-5 °, inside of which, above its axis with a length of not more than 1/3 of the length of the pipe, there is a longitudinal partition 2 in the form of a groove, at the lower end of which, at an angle greater than the angle tilt the gutter to the horizon, a lattice is fixed for destroying the globules of the oil-water emulsion 3. In the upper part of the pipe 1 above the upper end of the gutter 2, installed with a gap relative to the end of the body, there is a gas-oil-oil emulsion inlet pipe 4, above which a gas outlet pipe is placed 5. Pa the gas-oil-inlet emulsion inlet pipe 4 and gas outlet 5 are separated by a partition 6 connecting the upper end of the trough 2 to the upper part of the pipe 1. At the bottom of the pipe 1 there is a pipe for the selection of dehydrated oil 7 and below its level a pipe for taking water 8, between which in the lower part the pipes are placed dividing the transverse partitions 9 and 10. The transverse partition 9 separating the nozzle for the selection of dehydrated oil is fixed to the bottom of the pipe without a gap and with a gap to the bottom surface of the trench 2, and the other 10 are installed with a gap between n bo ttom pipe part 1 and lower surface 2. The gutter body 1 is provided with a liquid level indicator 11, mounted at its ends.

The tube phase divider operates as follows.

A gas-oil-water emulsion is supplied through a pipe 4 to the elevated part of the pipe 1 to the upper end of the trench 2 and flows down its surface to the lower end. At the same time, gas is separated from the liquid phase, and small drops of water coagulate to larger sizes. The gas extracted from the liquid phase passes through the cells of the grate 3 and under the groove 2 through the formed gas channel between the lower surface of the groove 2, the end face of the housing 1, the partition 6 separating the gas-oil emulsion inlet pipe and the gas outlet pipe 5, and the gas-oil contact surface is removed through the gas outlet pipe gas 5. The water-oil emulsion after leaving the gutter 2 enters the lattice to destroy the globules of the oil-water emulsion 3. Hitting the lattice 3, the armor shells of the globules are destroyed, and water droplets in the process of settling Ia effectively separated from the oil phase. Water after settling is collected in the lower part of the pipe 1 and flows through the gaps of the transverse partitions 10 to the water outlet 8. Oil, having a lower density than the density of water, flows through the upper section of the transverse partitions 9 and 10, is collected in the elevated part of the pipe 1 and is removed through the pipe for the selection of dehydrated oil 7, which is above the level of the pipe for the selection of water 8.

The transverse partition 9 prevents the separation of the separated water from the oil. Throughout the process, the liquid level in the housing 1 is monitored by liquid level indicators 11.

Field tests of a tube phase divider with a diameter of 1200 mm and a length of 30 m at the Ludoshurskoye oil field showed that when the emulsion load was 1780 m ³ / day, the water content decreased from 96.8% to 1.2-1.8%, which confirms the high the effectiveness of the invention.

Claims (3)

1. The pipe phase divider, comprising a housing in the form of a pipe with dividing transverse partitions, with a pipe for introducing a gas-oil emulsion, a gas discharge pipe located in the upper part of the pipe, a water pipe located in the lower part of the pipe and a pipe for the selection of dehydrated oil, characterized in that the casing is installed at an angle of 3-5 ° to the horizon, equipped with a longitudinal partition in the form of a gutter installed with a gap relative to the upper end of the casing, with a length of not more than 1/3 of the length of the pipe and placed above its axis, on the lower end of which there is a device for destroying the globules of oil-water emulsion, and above the top there is a nozzle for introducing a gas-oil emulsion, which is located in the upper part of the pipe below the level of the gas outlet pipe and is separated from it by a partition connecting the upper end of the gutter to the upper part of the pipe, and the selection pipe dehydrated oil is located in the lower part of the pipe above the level of the pipe for water extraction, and the dividing transverse partitions are located in the lower part of the pipe between the pipe for the selection of dehydrated PTI and water intake pipe, one of them separating the dehydrated oil sampling tube is fixed on the lower part of the tube with a gap relative to the bottom surface of the trough, and the other set with a gap between the bottom of the tube and the bottom trough surface. 2. The pipe phase divider according to claim 1, characterized in that the device for destroying the globules of the oil-water emulsion is made in the form of a lattice mounted on the lower end of the gutter at an angle greater than the angle of inclination of the gutter. 3. The tube phase divider according to claim 1 or 2, characterized in that the casing is equipped with liquid level indicators mounted on its ends.

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