RU163564U1 - DEVICE FOR CYCLIC CLEANING OF PLASTIC WATER IN OIL PRELIMINARY PREPARATIONS - Google Patents

Abstract

A device for the cyclical treatment of produced water at oil pre-treatment plants, including a pipeline for supplying well products to preliminary water discharge tanks (RPS), a pipeline for supplying produced water from the RPS to the water treatment unit for injection into the formation, a dehydration unit, a desalination unit, a drainage drainage pipeline sedimented water with a residual content of solids and oil from the dewatering unit in the recycle pipeline, drainage pipe for removal of sedimented water with a residual the use of mechanical impurities and oil products from the desalination unit to the recycle pipeline, an emergency technological barn, characterized in that a heating unit is located between the RPS and the dewatering unit, and a filter is installed on the water recycle pipeline connecting drainage pipelines from the dehydration and desalination units to the inlet of the RPS , one of the outlets of which is connected to the supply line for the production of wells in the RPM, the other outlet of the filter is hydraulically connected to the entrance to the emergency-technological barn, while the pipeline is connected to the filter for how to clean it.

Description

Device for cyclical treatment of produced water at the preliminary oil treatment plants

The utility model relates to the oil industry and can be used in pre-treatment plants for the treatment of water injected into the reservoir to maintain reservoir pressure during oil production.

State of the art

A well-known installation of oil treatment (RF patent No. 2295996, IPC B01D 17/00, date publ. 03/27/2007). The installation includes a crude oil supply collector connected in series, a water discharge tank, a gas separation stage, a raw material buffer tank, a preliminary water discharge tank, a demulsifier dispenser, a raw pump, an oven, a droplet former, a dewatering stage settler, a mixing unit connected to a fresh flushing pipeline water, a sump of the desalination stage, a heat exchanger, a technological tank, a commodity tank, an oil metering unit, a drainage water recirculation pipeline. The mixing unit is made in the form of a container with fresh wash water inlet, oil inlet and outlet, and the fresh water inlet is equipped with an electromagnetic vibro-jet mixer located in the oil inlet zone.

The disadvantage of this installation is that when passing an oily liquid according to this scheme, only the salt content decreases, but not the mechanical impurities.

The closest in technical essence and design is the standard technological scheme (Tronov VP “Field oil preparation”, Tatarstan Academy of Sciences, Kazan: Feng, 2000, - 416 pp.), Used in oil pre-treatment units of LLC “LUKOIL- PERM ”, including a pipeline for supplying oil-containing liquid (hereinafter referred to as“ slurry ”) from a field to an end separation unit (hereinafter referred to as KSU), a pipeline for supplying slurry from KSU to tanks for preliminary water discharge (RPS), a pipeline for supplying partially dehydrated slurry to pumps, a pipeline for draining water from the RPM to a water treatment unit, a heating unit, a pipeline for supplying fresh hot water to a boiler, a dewatering unit, a pipeline for supplying fresh water to the inlet of the desalination unit, a recovery unit, a pipeline for draining commercial oil, a drainage water recirculation pipeline, a pipeline drainage water drainage from the dewatering unit, drainage water drainage pipe from the desalination unit

A drawback of the existing formation water treatment scheme is that the process does not provide for the purification of water intended for injection into the formation on the water recirculation line discharged from the oil treatment sumps to the preliminary discharge tanks, which leads to a decrease in the efficiency of the process of maintaining pressure in the reservoirs that due to mechanical impurities, pores are clogged in productive formations, preventing the penetration of water into the capillary channels of the formation, reducing the effectiveness of work to maintain reservoir pressure.

Utility Model Disclosure

The technical result achieved by the proposed utility model is to improve the quality of the produced water injected into the formation to maintain reservoir pressure.

The technical result is achieved due to the fact that before the injection of water separated after the well production passes through the heating unit, the sumps of the dewatering unit and the desalination unit, in the water intended for injection into the formation to increase the reservoir pressure during oil production, the content of solids, nitrous hydrates is reduced , iron oxide due to the fact that on the return line - hereinafter “recycling pipeline” of water from the dehydration and desalination units to the preliminary water discharge tank, a filter is installed, one and the outlets of which are hydraulically connected to the line for supplying well products to the preliminary water discharge tank (hereinafter referred to as RPS), and the other outlet of the filter element is hydraulically connected to the entrance to the emergency technological barn, and the system includes a line for supplying water from the RPS to the filter for cleaning it.

New in the proposed utility model is that a filter is installed on the water recycling pipeline connecting drainage pipelines from the dewatering and desalination unit to the inlet of the RPS, one of the outlets of which is connected to the supply line for the production of wells in the RPS, the other outlet of the filter is hydraulically connected to the inlet in the emergency-technological barn, while the pipeline is connected to the filter to carry out its cleaning.

Brief Description of the Drawings

In FIG. 1 is a diagram of the cyclical treatment of produced water at the preliminary oil treatment facilities in the field.

Utility Model Implementation

The system of cyclical treatment of produced water at the pre-treatment facilities for oil in the field includes:

- pipeline 1 for supplying well products to the tanks of preliminary water discharge (RPS) 2

- pipeline 3 for supplying formation water from the RPM 2 to the unit 4 for preparing water for injection into the formation

- heating unit 5

- dehydration unit 6

- pipeline 7 for supplying fresh water to the desalination unit 8,

- pipeline 9 for the diversion of oil to the fleet

- drainage pipeline 10 for the removal of wastewater with a residual content of mechanical impurities and oil products from the dehydration unit 6 to the recycling pipeline 12

- drainage pipe 11 for discharge of wastewater with a residual content of mechanical impurities and oil products from the desalination unit 8 to the recycling pipeline 12

- filter 13 mounted on the recycle pipe 12

- pipeline 14 drainage sludge with mechanical impurities and residual oil from the filter 13 into the emergency technological barn 15

- block 16 preparation of substandard oil, hydraulically connected to the emergency technological barn 15 and block 4 of the preparation of water for injection into the reservoir

- pipe 17 for supplying water when washing the filter 13.

The cyclical treatment of produced water at the preliminary oil treatment plants is carried out as follows:

Well production from the fields goes through pipeline 1 to the preliminary water discharge tank (RPS) 2, in which sediment and separation of the oil-water mixture into oil and water occur. After leaving RPS 2, in the heating unit 5, the oil is heated to about 70 ° C and sent to the dehydration unit 6. In the sumps of the dehydration unit 6, the process of desalination is carried out, the oil is sedimented from the water (sedimentation time is at least 2 hours) and the sediment is discharged water into the drainage pipe 10 connected to the recycle pipe 12. The pressure in the dewatering tanks 6 during the discharge of water is maintained within 0.15-0.35 MPa.

The oil dehydrated in the settling tanks of the dewatering unit 6, with a water content of 0.06-2%, is mixed with hot water supplied from the boilers through pipeline 7 in order to remove salts from it and sent to the settling tanks of the desalination unit 8. The temperature of the liquid in the settling tanks of the unit desalination 8 is about 30-65 ° C. The oil-water phase separation level in the sumps of the desalination unit 8 is automatically maintained at a level of 0.6-0.8 m by regulators installed at the outputs of the settled water in the drainage pipe 11, which then flows into the recycle 12 pipeline. After the desalination unit 8, the oil through pipeline 9, after passing several more stages of processing, it is sent to the goods park.

The sumps of the dewatering unit 6 and the desalination unit 8 are hydraulically connected by drainage pipelines 10 and 11 corresponding to the recycle pipe 12 to drain the settled water in them with a residual content of solids and oil products.

In order to improve the quality of produced water, sent to the RPS 2 through the recycle 12 pipeline and then through the pipeline 3 for injection into the reservoir, water is passed through a filter 13 installed on the recycle 12 pipeline. After passing through the filter 13, purified water with a reduced content of solids and petroleum products, through the outlet section of the recycle 12 pipeline, enters the entrance to the RPS 2 together with the production of wells supplied through the pipeline 1, ensuring the cyclical supply of water for injection into the reservoir through the pipeline 3.

The filter cake in the form of solids and oil residues is sent via line 14 to the emergency technological barn 15 or to the substandard oil preparation unit 16 if the solids content is more than 0.05%.

In order to increase the service life of the filter 13, the purified produced water from the RPS 2 through the pipe 17 is periodically directed, for example by countercurrent, into the filter 13 and the sediment is washed into the pipe 14, cleaning the filter 13.

The proposed scheme for the cyclical treatment of produced water at the preliminary oil treatment plants is used to prepare water that meets the requirements of the standard of the LUKOIL-PERM LLC company for water quality (oil content up to 45 mg / l, suspended solids (HDTV) up to 29 mg / l ), used for further injection into the reservoir to maintain reservoir pressure during oil production.

Claims (1)

A device for the cyclical treatment of produced water at oil pre-treatment plants, including a pipeline for supplying well products to preliminary water discharge tanks (RPS), a pipeline for supplying produced water from the RPS to the water treatment unit for injection into the formation, a dehydration unit, a desalination unit, a drainage drainage pipeline sedimented water with a residual content of solids and oil from the dewatering unit in the recycle pipeline, drainage pipe for removal of sedimented water with a residual the use of mechanical impurities and oil products from the desalination unit to the recycle pipeline, an emergency technological barn, characterized in that a heating unit is located between the RPS and the dewatering unit, and a filter is installed on the water recycle pipeline connecting drainage pipelines from the dehydration and desalination units to the inlet of the RPS , one of the outlets of which is connected to the supply line for the production of wells in the RPM, the other outlet of the filter is hydraulically connected to the entrance to the emergency-technological barn, while the pipeline is connected to the filter for how to clean it.

Images