RU41793U1 - PRESTIGE FILTER INSTALLATION - Google Patents

Abstract

Wellhead filtering installation, comprising a housing with a filter, a water conduit, tubing placed in the well and hydraulically connected to the housing, switchgears, characterized in that the housing is made in the form of a vertical pipe element with a filter in the middle part and a water conduit in the lower this, the upper part is connected to the tubing through a switchgear passing only to the casing, and the bottom through a switchgear passing only from the casing.

Description

The proposal relates to the oil industry, in particular to systems for waterflooding and maintaining reservoir pressure during the development of oil fields, in particular, during the operation of high and low permeability formations.

A known filter installation for an injection well, including a filter with a receiving and output parts and tubing placed in the well and hydraulically connected to the filter (av. St. SU No. 1534184, IPC E 21 V 43/08, publ. BI No. 1 dated January 7, 1990). The filter plant allows you to clean the injected water directly at the level of the reservoir.

The disadvantage of this filter unit is the difficulty in operation, since the filter is placed in the well at the level of the reservoir and when it is clogged with clogging particles, mechanical impurities, etc. Mandatory shutdown of the well and raising the filter to the surface in order to clean it or replace it with a new one are required In addition to stopping the injection well, this also requires considerable time and additional technical means.

The closest in technical essence to the proposed one is "Filtering unit for injection wells" (Patent RU No. 2065928, IPC E 21 B 43/20, publ. BI No. 24 of 08.28.1996), including a filter with receiving and output parts and tubing placed in the well and hydraulically connected to the filter, equipped with a discharge pipe with receiving, distribution and wellhead valves, connected to the receiving part of the filter through the receiving valve, with the output part of the filter through the distribution valve and from the pump o-compressor pipes through the distribution and wellhead valves, while the discharge pipe between the receiving valve and the receiving part of the filter is made with a drain pipe and a valve placed on it, and the filter is made in the form of a continuous housing with gratings installed from the ends of the filter, the inner space between which filled with filter material. The filter unit allows you to clean the water injected into the reservoir and regenerate the filter material by changing the direction of the water flow through the filter by manipulating the valves.

The disadvantage is that the filter unit is inoperative when installed on an injection well, which pours out while the pumps are stopped. At the same time, the clogging material and oil from the bottomhole formation zone pollutes the filter, reducing its resource. When resuming injection, the main part of the contaminants returns to the reservoir, polluting the bottom-hole zone and thereby reducing the injectivity of the injection well.

The technical task of the proposed utility model is to simplify the maintenance of the filter installation, reduce the loss of injectivity of the reservoirs, increase the time between cleaning the bottom-hole zone of injection wells and, as a result, save material costs to maintain reservoir pressure.

The problem is solved by the proposed estuarine filter installation, including a housing with a filter, a water conduit, tubing placed in the well and hydraulically connected to the housing, switchgears.

What is new is that the casing is made in the form of a vertical tube element with a filter in the middle part and a water conduit in the lower one, while the upper part is connected to the tubing through a switchgear passing only to the casing, and the lower one through a switchgear passing only from the body.

The drawing shows the device of the mouth filter installation, wherein: I - injection of water into the reservoir, II - spill of water from a low permeability to a high permeability reservoir, III - pollution removed by washing.

The wellhead filtering installation is a casing 1 made in the form of a vertical tube element with a removable top cover 2, a filter 3 located in the middle of the casing, pipelines 4 connecting the casing 1 to the tubing 5 of the injection well 6, switchgears (check valves , valves, etc.) 7 and 8, with the upper part 9 of the casing connected to the tubing through a switchgear 7, which passes the flow only to the casing 1, and the lower part of the casing 10 is connected a water conduit 11, and with tubing through the distributor device 8, only permit flow from the housing 1, the upper 9 and the lower housing portion 10 are provided with drain pipes 12 and 13, respectively.

The device operates as follows.

The water prepared at the head treatment facilities is pumped into the water conduit 11 and pumped into the injection well b to maintain reservoir pressure in the reservoir 14. When water is pumped into the injection well b, the water flow I moves through the water conduit 11 and passes through the lower part 10 of the filter unit through the open dispenser 8, while the dispenser 7 closes the line 4, the filter 3 is not involved in the treatment of the water I injected into the formation. FIG. as a switchgear, a non-return valve is conventionally shown. Water 6 is injected into well 6 with a low concentration of oil particles and solid suspended particles (of the order of 10 ... 20 mg / l) and their insignificant sizes - of the order of 2 ... 20 microns.

When the pumps are stopped, part of the injected water is poured out of low-permeability formations 14 through low-pressure injection wells 6 into the water conduit 11. The poured liquid contains a significant concentration of contaminants (250 ... 1200 mg / l, and in some portions it reaches tens and hundreds g / l ) removed from the bottomhole zone 15. Moving along tubing 5 oil globules with solid particles additionally coalesce and coarsen, reaching sizes 1 ... 20 mm at the wellhead, and in some cases forming larger ones, including eniya and jets. When the flow of spout II from a low-pressure injection well 6 through tubing 5 into a water conduit 11, the water distribution device 8 is closed and the water distribution device 7 is opened on line 4 of the well filtration unit, as a result of which water II is discharged, containing the pollution it carries out from the bottomhole zone 15 of the low-pressure injection well 6, is sent to the filter 3, on which the water from the spout is cleaned from contaminants, and large oil globules coagulate and accumulate Xia in the upper body portion 9 of the filter installation. Part of the suspended solids not captured by the filter 3, further settles in the lower part 10 of the housing. After filter 3, the purified water of the spout enters the conduit 11 and then is discharged into the tank or fed through a highly-responsive well into highly permeable reservoirs in a single hydrodynamic system. Collected contaminants III from the casing 1 of the mouth filter unit as they accumulate in the upper 9 and lower 10 parts are removed by washing through the nozzles 12 and 13, respectively, for processing when pumping is restored by pumps into the low-pressure injection well 6 with the open distribution device 8 and the closed distribution device 7. At the same time, when opening the pipe 12 of the upper part of the housing 9, the filter 3 is flushed back

pure water from the conduit 11 and the regeneration of its filtering properties. If necessary, it is possible to replace the filter 3 with a new one through the removable upper cover 2 of the housing. Thus, the installation ensures that water is cleaned of contaminants during a spout from a low-well well, which occurs when there is a hydraulic connection between the wells that have opened reservoirs of different permeability, preventing the spill from entering the water conduit into a highly-responsive well and re-contamination of the bottomhole formation zone of low-pressure injection wells . The spout can also be organized forcibly by draining water from a water conduit to a tank at a cluster pump station.

An example of a specific implementation.

There is a group of highly responsive injection wells with an injectivity of 800 cubic meters. meters per day at wellhead pressure of 10 MPa and a group of low-pressure injection wells having injectivity from 50 to 200 cubic meters. meters per day at wellhead pressure of 15 MPa, in a single hydrodynamic system.

Water I is pumped by a cluster pumping pump through a water conduit 11 into highly-responsive injection wells (equipped with flow regulators - fittings to limit the volume of water entering them) and low-pressure injection wells 6 through an open switchgear 8 and the lower part 10 of the housing of the mouth filter unit with a flow rate of 1400 cube meters per day and pressure on the pump side 11 MPa. The switchgear 7 is closed, there is no movement of water from the housing 1 to line 4, the filter 3 does not work.

When the pumps are stopped, for example, in accordance with the schedule of periodic (cyclic) injection, a depression of up to 5 MPa is created in the hydraulic system. Wellhead pressure on a low-pressure injection well 6 drops to 10 MPa, and water 6 flows out of the well 6 with a low-permeable reservoir 14 into a water conduit 11 and then it is poured into a tank or fed into wells with highly permeable reservoirs through highly-sensitive wells in the amount of about 10 ... 20 cc meters. In this case, the switchgear 8 is closed and the switchgear 7 is opened, the spout flow is sent along line 4 to the upper part 9 of the mouth filter unit, then through the filter 3 to its lower part 10 and then to the water conduit 11. When the fluid moves from the injection well 6 along tubing 5 into the conduit 11 is the removal of contaminants from the bottom-hole zone 15, consisting mainly of solid and oil particles. The maximum size of finely dispersed contaminants in the spout is 60 microns, and large inclusions up to 20 mm. The concentration of suspended solids is up to 200 mg / l. The concentration of oil particles varies in

in the range from 250 to 1200 mg / l, reaching a peak value of 143 g / l (field data). When passing the spout water with contaminants carried out from the bottomhole zone 15 of the low-permeability formation 14, oil and solid suspended particles are caught from the filter 3 from it. Water, from which 90% of the contaminants were removed, with residual fine contaminants, enters the water conduit 11 and then into the tank or into highly receptive wells. Collected contaminants III from the casing 1 of the mouth filter unit as they accumulate in the upper 9 and lower 10 parts are removed by washing through the nozzles 12 and 13, respectively, for processing when pumping is restored by pumps into the low-pressure injection well 6 with the open distribution device 8 and the closed distribution device 7. At the same time, when opening the pipe 12 of the upper part of the housing 9, the filter 3 is backwashed with clean water from the water conduit 11 and the regeneration of its filtering properties.

The technical and economic efficiency of the proposed estuarine filter plant is achieved by eliminating the additional costs of cleaning the filter from contaminants carried out by the spout from the bottomhole formation zone, reducing the cost of flushing the supply high-pressure pipelines, and increasing the efficiency of injection wells with intermittent water injection.

The use of this proposal allows using the existing RPM system to reduce the loss of injectivity of the reservoirs, increase the time between overhauls of the bottom-hole zone of injection wells and, as a result, save material costs for maintaining reservoir pressure.

Claims (1)

Wellhead filtering installation, comprising a housing with a filter, a water conduit, tubing placed in the well and hydraulically connected to the housing, switchgears, characterized in that the housing is made in the form of a vertical pipe element with a filter in the middle part and a water conduit in the lower this, the upper part is connected to the tubing through a switchgear passing only to the casing, and the bottom through a switchgear passing only from the casing.