RU138431U1 - INSTALLATION FOR PRELIMINARY DISCHARGE OF PLASTIC WATER - Google Patents

Abstract

1. Installation for pre-discharge of produced water, including a device for preliminary separation of well products into phases with lines for their removal, installed in the immediate vicinity of production and absorbing wells, characterized in that the device for preliminary separation of well products is installed in the immediate vicinity of a group metering unit ( AGZU), as a device for preliminary separation of well products, a high pressure device is selected, made with the possibility of Ia produced water from the oil and gas phases; the high-pressure device is equipped with a pipeline for introducing well products from the gas treatment plant or directly from the absorption well, a pipeline for diverting water from the high-pressure device directly to the absorption well, a pipeline for diverting the oil and gas phase to the AGZU collector for further product transportation, a valve for regulating the volume of discharged water, connected to a high-pressure device using a pipeline to divert water into an absorbing well, a medium level indicator, an electric contact pressure gauge for transmitting a signal to the valve actuator. 2. Installation for preliminary discharge of produced water according to claim 1, characterized in that a vertical or horizontal gas separator is used as a high-pressure device. Installation for preliminary discharge of produced water according to claim 1, characterized in that an oil dust collector is used as a high-pressure device.

Description

The utility model relates to the oil industry, in particular, to installations for preliminary water discharge and can be used in oil production.

A known installation of pre-discharge of produced water (USSR AS No. 1423142 B01D 19/00, B01D 17/035), designed to accelerate the treatment of produced water and improve the quality of treated water. The installation includes a pipeline, a preliminary gas sampling device connected to a three-phase separator, from which the drainage lines of oil, gas and waste water, respectively, depart. The drainage line is connected to the exhaust line by a pipe jumper with a locking element. The pipe jumper is equipped with a gas dispersion device installed at the junction of the jumper with the drainage line. Locking elements are installed on the gas and drain lines and, the first of which stands after connecting to the exhaust line, and the second before connecting the jumper to the drain line. The wastewater discharge line is connected to a receiving tank, which is equipped with a low pressure gas line, a pipeline for supplying oil to the buffer tank, and a pipeline for supplying clean water with a pump to the pumping station.

A known tank for preliminary water discharge (RF No. 2145512 B01D 17/00), comprising nozzles for introducing liquid, for partially draining oil and discharging water, a distributor for introducing liquids, a device for collecting partially dehydrated oil and water, an oil-water interface level regulator characterized in that the liquid inlet dispensing device is placed along the vertical axis inside the tank at the height of the oil-water interface and is made in the form of a cyclone head with a cap, the device for collecting partially of crude oil is made in the form of a riser pipe with open ends at the height of the upper liquid level in the tank, distributed symmetrically and evenly over its cross section, and is also equipped with a switchgear for introducing hot oil in the form of a pipe system with holes, symmetrically and evenly located over the tank cross section the height of the oil-water interface.

A known method and device for preliminary water discharge in systems for collecting oil production wells (RF №2135886 F17D 3/14). A method for preliminary water discharge in an oil production well collection system, including transporting a gas-liquid mixture through a supply pipe to a still pipe with gas separation therein through a branch pipe and then into an inclined pipe, controlling an oil-water and oil-gas interface in an inclined pipe, regulation of gas-liquid mixture flow rate, maintaining a certain position of the oil-water interface in the inclined pipe relative to the point of entry of the stilling pipe into the inclined pipe s and the subsequent discharge of water from the lower part of the inclined pipe and the removal of gas from its upper part, characterized in that in the stilling pipe, the gas-liquid mixture is more completely degassed and the liquid mixture is completely separated, and in the inclined pipe the oil-water phase boundary is maintained lower entry points of the stilling pipe into the inclined pipe.

A known installation for preliminary water discharge in systems for collecting well production (RF No. 2135886 F17D 3/14), including a gas-liquid mixture supply pipe 1, a still pipe 2, equipped with a gas outlet pipe 4 at the inlet, and an inclined pipe 5 equipped with phase separation sensors 6 oil - water and oil - gas and a gas-liquid mixture flow regulator, characterized in that the stilling pipe 2 is made in a straight line, has the same diameter with an inclined pipe and an eccentric upper entrance of the gas-liquid mixture, and at the outlet It is additionally equipped with a pipe 4 for exhausting gas into an inclined pipe at a right angle to its axis, and the angle of inclination of the inclined pipe relative to the horizon is 4-15 °.

A known installation of preliminary discharge of water from oil well products (RF No. 2343953 B01D 19/00), which includes pipelines for supplying oil well products to a distribution unit connected by a soothing collector to a preliminary separation unit, which is connected by pipes for discharging previously separated gas, oil and water with an oil and gas separator having pipelines for the discharge of gas, oil and water. The oil drain pipe is connected to the oil dehydration apparatus. The oil dehydration apparatus is equipped with a device for taking part of the dehydrated oil and supplying it to the outlet pipe for pre-separated oil or to the pipe outlet for pre-separated oil and to the oil drain pipe. A device for the selection of a portion of dehydrated oil and its supply is equipped with a track oil heater, a unit for dosing and supplying a chemical reagent. The technical result consists in increasing the efficiency of the installation, improving the quality of water treatment, reducing the consumption of demulsifier and disposal.

Known installation of water discharge (RF №2098166 B01D 19/00), consisting of an inclined pipeline, above which is parallel to the pipeline connected to it by jumpers. The gas-liquid flow damper following the oil and gas pipeline is cut sideways into the lower inclined pipeline at the gas-liquid mixture inlet point. The damper in the upper part is connected to an inclined pipe. The upper ends of the inclined pipelines are connected to the flow oil and gas pipeline, the lower end of the pipeline to the consumer outlet conduit. The installation is located on pile foundations.

The disadvantages of these devices are their large dimensions, requiring an extensive network of hardware devices for maintenance and expensive pumping equipment, the constant presence of personnel at the facility around the clock, as well as the inability to provide preliminary discharge of produced water directly into the well immediately after the flow of well products from the group metering unit for gas measurement in oil (AGZU).

A known installation for preliminary water discharge (RF No. 2230594 B01D 17/00), adopted as a prototype, which ensures the utilization and discharge of water at the place of extraction at an oil field without transporting water over long distances. The installation comprises a device for preliminary separation of well products into phases with lines, their removal into oil and water separators, buffer tanks for oil and water with pumps and a heater, characterized in that the installation further comprises a gas separator installed on the water drain line from the preliminary separation device wells for phases, made in the form of an inclined pipe with a water supply line above the liquid level and connected with a water separator, while the above-mentioned apparatus is made in the form of an inclined pipe pipelines with lines for supplying wells, water, oil and gas, an oil separator in the form of a tank with partitions, a water separator in the form of a settling tank with a hydrophobic layer, and a heater is installed on the line for draining oil from the buffer tank for oil with the possibility of supplying heated oil in the line for supplying well products and in the line for introducing oil into the oil separator, while the gas outlet lines from all apparatuses of the installation are connected to a common gas pipeline with the possibility of supplying gas as fuel to the heater.

The disadvantage of the prototype is its structural complexity, the use of a large number of devices, separators and high-pressure pumps, and the need for round-the-clock personnel service.

The objective of the claimed device is to eliminate these drawbacks and to achieve a technical result, which is to simplify the design, to reduce the equipment involved, leading to a decrease in the length of the water conduit and, ultimately, to a multiple reduction in the proportion of pumped gas-oil mixture to the oil treatment point (PPN) for by separating and increasing the volume of pre-discharged water into the absorbing well without additional purification of the discharged water, without the involvement of permanent personnel facility.

The problem is solved in that in the installation for preliminary discharge of produced water, including a device for preliminary separation of well products into phases with drain lines installed in the immediate vicinity of production and absorbing wells, according to the claimed solution, a device for preliminary separation of well products is installed in close proximity from a group metering unit (AGZU); as a device for preliminary separation of well production, a high pressure device is selected that is capable of separating formation water from the oil and gas phase; the high-pressure device is equipped with a pipeline for introducing well products from the gas treatment plant or directly from the absorption well, a pipeline for diverting water from the high-pressure device directly to the absorption well, a pipeline for diverting the oil and gas phase to the AGZU collector for further product transportation, a valve for regulating the volume of discharged water, connected to a high-pressure device using a pipeline to divert water into an absorbing well, a medium level indicator, lecture contact pressure gauge for transmitting a signal to the valve actuator.

At the same time, a vertical or horizontal gas separator or an oil dust collector was used as a high-pressure device.

The inventive device is illustrated in the drawing, which shows a diagram of the installation of the preliminary discharge of associated (formation) water, where the positions indicated:

1 - production well,

2 - group metering unit for measuring gas in oil (AGZU)

3 - pipeline from the producing well 1 to the AGZU,

4 high-pressure device for preliminary discharge of associated water

5 - prefabricated pipeline from AGZU 2 to the high pressure device 4,

6 - absorbing well for disposal of associated formation water,

7 - pipeline from the high-pressure device 4 to the absorbing well 6 for preliminary drainage of associated water,

8 - pipeline from the high-pressure device 4 for the removal of the oil and gas mixture with residual water to the collection point of oil and gas,

9 - valve that controls the volume of discharged water into the absorbing well 6,

10 - pipeline from the high pressure device 4 to the valve 9,

11 - signaling level of the section of the media,

12 - electrical contact pressure gauge,

13 - automation mechanism unit (BMA) with a control and indication cabinet

One of the main directions of modernizing the equipment of old oil fields is to ensure the early discharge and disposal of associated formation water, i.e. reduction of pumping volumes and aggressive corrosion front, without the use of additional pumping equipment and not requiring the presence of maintenance personnel at the facility. The claimed technical solution allows for the early discharge and disposal of formation water by preliminary discharge on the bushes of high-yield and high-flooded wells or next to a group metering unit (AGZU). Moreover, the claimed solution allows you to pump the separated formation water into the reservoir under pressure created in the system for collecting well products, that is, without the use of additional pumping equipment and on the same wellbore. For this purpose, in the inventive installation, the existing, but decommissioned equipment was used for a new purpose, the installation of which does not require additional land allotment due to its minimum dimensions and location near the well and the gas processing unit.

Description of the essence of the proposed solution.

The claimed solution relates to the preliminary discharge and disposal of produced water at points of the technological system for producing well products, where it is released as a free phase, namely, in high-pressure tanks that are installed next to an automatic group metering device for measuring gas in oil (AGZU). In the inventive installation, as a device for separating and preliminary discharging formation water into the well, thick-walled high-pressure containers are used in which the redistribution of phases to water and oil and the allocation of water in the form of a free phase occurs due to the forces of gravity and the hydrocyclone method.

Installation for preliminary discharge and disposal of produced water contains a high pressure device 4, which is configured to separate the well products into fractions (water and gas with oil) and is installed next to a group metering unit (AGZU) at a distance of 10 meters to 100 meters, or near the wellhead. As a high-pressure device 4 for preliminary discharge of associated formation water, a thick-walled high-pressure tank can be used - for example, a gas separator (F-1600 R-64 grade N-488-55 Ρ -64) of vertical or horizontal design or a standard oil dust collector, ( for example, F-1600 P-64 grade N-488-55) - equipped with pipelines and bends: for the flow of separated water into the well and for the flow of oil with dissolved gas, as well as regulatory and control devices.

The high-pressure device 4 (gas separator or oil dust collector) for preliminary discharge of associated water is connected to the gas condensate storage unit by a pipeline 5, through which well products 1 enter the device 4. Well products 1 enter the device 4 with a pressure of 30 kg / cm2 to 60 kg / cm2 (depending on the pressure of the installation of the producing well 1 and the permitted pressure of the device 4, as well as taking into account the injectivity of the absorbing well 6, intended for disposal of associated formation water.

The high-pressure device 4 is also equipped with a pipeline 7 for draining the separated associated water into the absorbing well 6, a pipeline 8 for draining the oil and gas flow with residual water through the AGZU collection pipeline to the oil and gas collection point, and a valve 9 for regulating the volume of discharged water into the absorbing well 6, which is connected to the device 4 by means of a pipeline 10; as well as a signaling device 11 of the medium separation level and an electric contact pressure gauge 12 for providing a signal to the actuator of the control valve 9.

The signaling device 9 of the level of the medium section is connected to the signaling unit (not shown in the drawing), which is located in the control and display cabinet located in the room of the unit 13 of the automation mechanism (BMA). The electrical contact pressure gauge 12 is connected in the room of the unit 13 of the automation mechanism (BMA) to the control unit of the actuator of the control valve 9, which is also located in the control and display cabinet (shown in the drawing).

On the pipeline 7, leading to the absorbing well 6, to more accurately take into account the quality of the discharged bottom water, a reading device is installed (not shown in the drawing), with which the permissible oil content in the injected water is controlled. In addition, a sampler is installed at the outlet pipe for the discharge of associated formation water, which performs sampling and quality control of the discharged associated water.

Thus, both vertical and horizontal high-pressure gas separators or high-pressure oil dust collectors, in which separation is carried out by gravity and hydrocyclone processes, are used as a device for borehole preliminary discharge of water into the reservoir by a non-pumping method. For non-pumping water injection at the bushes of the producing and absorbing wells near the AGZU, other existing, but decommissioned thick-walled high-pressure devices that do not require round-the-clock maintenance by personnel can also be used.

The use of a high-pressure tank as a device for preliminary separation of well products installed in close proximity to the gas treatment plant and production and absorption wells allows to reduce the length of the discharge pipe when dumping associated formation water and eliminates the need for pumping equipment. The presence of a valve 9 and an electric contact pressure gauge 12, which regulate the pressure in the device 4, contribute to the separation of the production of the well in the device 4 into fractions and also eliminates the use of high-pressure pumping equipment when diverting well products. The presence of a medium level 11 level switch provides control of the quality of discharged formation water and the oil content in it and eliminates the need for its after-treatment. The presence on the pipeline 7 of the reading device provides an accurate record of the oil content in the discharged water, which also contributes to the achievement of the technical result - ensuring the quality of the discharged water into the formation without additional treatment.

Installation works as follows.

The production of well 1 through pipeline 3 enters AGZU 2, from where (after measurements of the volume of oil emulsion and gas contained) the flow of oil, gas and associated water through pipeline 5 enters high pressure device 4 (vertical or horizontal gas separator or oil dust collector with a volume of 4- 16 m3) for preliminary separation and discharge of associated water. Under the action of high pressure and due to gravitational forces in the high-pressure device 4, the phases are redistributed into oil and gas and water flows: associated water is lowered into the lower part of the device 4 and enters the pipeline 10, and then into the pipeline 7, through which it is sent directly to the absorbing well 6. The valve 9 controls the pressure in the high-pressure device 4. In the event of a drop in pressure in the device 4 below the minimum value set on the monitoring electrocontact manometer (ECM) 12, it closes to ntakt on the electric contact manometer 12, a signal through block automation mechanism 13 is modeled and applied to the actuator control valve 9, which is subsequently closed. If the pressure rises above the maximum set on the contact manometer 12, the valve 9 opens. Moreover, under the influence of pressure and gravitational forces in the device 4, as well as the difference in the density and temperature of the fractions, the amount of residual oil in the discharged associated water does not exceed 100 mg / l, which is 0.001% of the pumped volume of production into the absorbing well 6 through the device 4 In this case, the oil and gas mixture with residual water, under the influence of pressure, gravitational forces, the difference in density and temperature of the fractions, is concentrated in the upper part of the high-pressure device 4. Oil and gas stream with residual water The first one passes through pipeline 8 to the AGZU 2 prefabricated oil pipeline and then to the oil and gas collection point for the final cleaning of oil from residual water. At the same time, the amount of produced and pumped oil and gas-liquid flow due to the maximum amount of pre-discharged associated water is reduced by 50-80%. The signaling device 11 of the interface section of the medium monitors the level of the medium in the high-pressure device 4, which allows to ensure the quality of associated formation water when preparing it for discharge into the absorbing well 6. Using an electrocontact manometer 12, the pressure in the device 4 is monitored, which provides operational control of the technological mode unit operation, elimination of risks during shutdown of production wells and discharge of oil products into the well.

When using the inventive installation, utilization of associated formation water from production wells to an absorption well 6 is achieved - from 150 m3 / day to 900 m3 / day at an operating pressure of 25-30 kg / cm2 and with a total volume of pumped crude oil up to 150 tons / day. In this case, the discharged and utilized water contains no more than 100 mg / l of oil products, which meets the requirements for produced water pumped into an absorption well 6 ..

An example of a specific implementation.

The operation of the inventive installation is described by the example of the Liman-Grachevskoye field.

The production of oil wells of the Liman-Grachevskoye field with high water cut, which reaches 98%, is supplied by electric centrifugal pumps (ESP) through line 3 through valves to AGZU with a pressure of 3.5 MPa and a temperature of 60 ° C. After the measurement, the product enters through a pipeline 5 into a vertical gas separator V = 9.6 m3 of preliminary water discharge (flow divider)

Due to gravitational sludge, the difference in phase density and liquid temperature, the oil emulsion is partially divided into oil and water. The separated formation water at a pressure of 38-40 kg / cm2 enters through the lower outlet of the gas separator through a pipeline 7 to an absorbing well 6

The separated oil emulsion due to the difference in the density of water and oil together with the dissolved gas through the upper outlet of the gas separator and through the choke valve with a decrease in pressure to 14 kg / cm2 enters pipeline 8 and is transported to SP-22 of the Liman-Grachevskoye field.

The signaling device 11 of the level of the interface separates the level of the medium in the gas separator 4, which allows you to monitor the quality of the preparation of associated formation water for discharge into the absorbing well 6.

The pressure gauge 12 monitors the pressure in the gas separator 4. When a parameter is changed, the pressure increases or decreases, a signal is received and the control valve 9 is controlled. If the pressure drops below the minimum value set on the pressure gauge 12, the control valve 9 closes when the pressure rises above the maximum values on the contact manometer 12 - the control valve 9 opens.

An electrical contact pressure gauge 12, a pressure regulating valve 9, and a medium level switch 11 are connected to the electronic control unit, which is located in the control and display cabinet (or on the instrument panel) in the room of the automatic control unit (BMA).

A sampler installed on the outlet collector of the associated formation water discharge performs sampling and quality control of the discharged associated water.

Measurement of the flow rate of the wells is carried out by switching the shutoff valves in the gas condensate storage unit and withdrawing the well from the technological regime for the discharge of associated formation water. Switchings are made according to the usual scheme and in accordance with the instructions for the use of fishing equipment.

When using the installation, utilization of associated formation water from producing highly flooded wells to an absorbing well of 6 to 400 m3 / day is achieved with a total flow rate of 900 m3 / day and a working pressure of 25-30 kg / cm2 and with a total volume of pumped oil emulsion of 500 m3 / day. In this case, the discharged and utilized water contains no more than 100 mg / l of oil products, which corresponds to the requirements for produced water pumped into the well 6. Also, for a more accurate accounting of the discharged associated formation water, an online meter is installed by a reader installed on the pipeline 7 to absorbing well 6.

The use of the inventive installation allowed to reduce the volume of well products received for transportation through the pipeline, and the volume of produced water supplied for disposal. At the same time, due to the use of a high-pressure device (gas separator or oil dust collector), which ensures the separation of water-gas-oil emulsion from associated formation water at an early stage, the oil stream with residual water can be transported completely without a pump for a distance of up to 30 km.

Thus, the claimed solution allows you to separate at the initial stage of water and gas-oil fraction, which reduces corrosion in the piping system and reduces the load on the equipment, as well as prevent the possibility of re-dispersion and facilitate the preparation of marketable oil using less energy resources. In addition, the inventive installation of preliminary discharge of produced water allows you to remove restrictions on the reception and processing of well products at the head installation of preliminary discharge of water. The inventive device in comparison with similar technical solutions provides a significant - up to 60% - increase in pre-discharged produced water with a minimum - up to 100 mg / l - the content of oil residues in it and, thereby, a decrease - up to 50-80% - of the well production for pumping it to further separation and processing. Using the inventive design of the installation eliminated the need for high-pressure pumping equipment, using automatic adjustment of the flow divider, without involving additional human resources.

Claims (3)

1. Installation for pre-discharge of produced water, including a device for preliminary separation of well products into phases with lines for their removal, installed in the immediate vicinity of production and absorbing wells, characterized in that the device for preliminary separation of well products is installed in the immediate vicinity of a group metering unit ( AGZU), as a device for preliminary separation of well products, a high pressure device is selected, made with the possibility of Ia produced water from the oil and gas phases; the high-pressure device is equipped with a pipeline for introducing well products from the gas treatment plant or directly from the absorption well, a pipeline for diverting water from the high-pressure device directly to the absorption well, a pipeline for diverting the oil and gas phase to the AGZU collector for further product transportation, a valve for regulating the volume of discharged water, connected to a high-pressure device using a pipeline to divert water into an absorbing well, a medium level indicator, electric contact pressure gauge for transmitting a signal to the valve actuator. 2. Installation for pre-discharge of produced water according to claim 1, characterized in that a vertical or horizontal gas separator is used as a high-pressure device. 3. Installation for preliminary discharge of produced water according to claim 1, characterized in that an oil dust collector is used as a high-pressure device.

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