RU2425959C1 - Well head equipment for simultaneous separate fluid injection - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: well head equipment for simultaneous separate fluid injection includes parallel tubing strings connected to individual water conduit lines having individual nozzles and flow metres and connected to common water conduit. On common water conduit there installed is liquid cleaning filter made in the form of flattened hollow cone with small diameter of flattened hollow cone, which is located opposite liquid flow. Surface of flattened hollow cone is provided with filtering slots with width of filtering slots which are less than hole of nozzle and with length which is more than width by 3-4 times. Each water conduit line also includes non-return valve. At that, nozzle, non-return valve and flow metre are located in water conduit line in series streamwise of pumped liquid flow. Gates of non-return valves are made in the form of ball segment facing the liquid flow leaving the calibrated orifice of nozzle.

EFFECT: higher operating reliability of equipment for simultaneous separate fluid injection owing to preventing formation contamination with pumped liquid, and avoiding well spring of formations.

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Description

The invention relates to the oil industry, in particular to the equipment of the wellhead for simultaneous and separate injection of fluid into different reservoirs uncovered by one well.

Known equipment for the separate injection of fluid in multilayer fields, which contains at least one pipe string with at least one packer lowered below the upper reservoir without or with a column disconnector. Below and above the packer, at least one landing unit in the form of a borehole chamber or a nipple with a removable valve for lowering the working agent through them into the lower and upper layers, landing the packer and crimping it from below and / or above, is lowered. The working agent is pumped from the mouth into the cavity of the pipe string at a given pressure, directing it to the upper and / or lower layers through the corresponding removable valves in the landing units (RF Patent No. 22253009, publ. 27.05.2005).

A disadvantage of the known device is the difficulties associated with regulating a given flow rate of fluid into specific formations, as well as the unreliable operation of the packer as a result of siltation and subsequent sticking by solid suspended particles contained in the injected fluid, as well as when the formation is self-draining when injection is stopped.

The closest to the proposed utility model in technical essence is a device for simultaneous and separate injection of fluid containing parallel columns of tubing that are equipped with separate water lines, each water line is additionally equipped with an individual fitting and flow meter (Utility Model Patent No.58606, publ. 11/27/2006 - prototype).

A disadvantage of the known device is the contamination of the formations with an injected liquid containing suspended particles, as well as the possibility of picking up the packer when lifting as a result of siltation of the overpacker zone. In addition, when the injection is stopped, the formation is self-draining with the removal of asphalt-resinous components and the redistribution of fluid between the layers with different injectivity.

The technical task of the invention is to increase the reliability of equipment for simultaneous and separate fluid injection by preventing formation contamination by injected liquid containing suspended solids, as well as eliminating formation self-discharge with the transfer of asphalt-resinous components into the well and fluid redistribution between the layers with different injectivity well.

The technical problem is solved in that on the equipment of the wellhead for simultaneous and separate injection of fluid, including parallel columns of tubing connected to individual water lines having individual fittings and flow meters and connected to a common water conduit, according to the invention, a cleaning filter is installed on a common water conduit liquid, made in the form of a truncated hollow cone with a small diameter of a truncated hollow cone, located opposite the fluid flow, the surface of the truncated the narrow cone is equipped with filter slots with a width of filter slots less than the nozzle opening and a slit length 3-4 times wider, each water line additionally contains a non-return valve, while the nozzle, non-return valve and flow meter are located on the water line in series with the fluid flow, and the check valve gates are made in the form of a spherical segment facing the fluid flow flowing from the calibrated nozzle opening.

Figure 1 shows the equipment of the wellhead for simultaneous and separate injection of fluid. Parallel columns of pipes 1 are equipped with individual water supply lines 2. On each water supply line 2 there is an individual fitting 3 with a flow meter 4 and with a check valve 5. A filter 6 is installed on the common water pipe of the well for simultaneous and separate injection of the liquid from the suspended solid particles.

Figure 2 shows a section of the filter, which contains a housing 7 with a window 8 for accommodating and attaching the filter element 9. On the surface of the filter element 9, filter slots are made for the passage of liquid 10. The filter 6 is made in the form of a truncated hollow cone, the surface of which is equipped with filter slots 10. The width of the filter slots 10 (slots) is less than the hole of the individual fitting 3, and the length of the slit is 3-4 times greater than the width. The small diameter of the truncated hollow cone is directed towards the fluid flow, which allows the filter slots to be cleaned at the target self-flow of the well, that is, at each stop of the fluid injection to clean the filter.

Figure 3 shows a cross-section of a check valve, which includes a housing 11 for accommodating the shutter 12. The inlet of the cone window 13 additionally serves as a seating seat for the shutter 12. The individual check valve 5 of the wellhead equipment of injection wells is intended mainly to prevent self-spillage of the well fluid in case of an accidental stop downloads. The contact of the spherical surface of the valve shutter 12 with the conical surface of the window 13 occurs along an annular line, which ensures the closure density of the valve. In addition, in the mode of water injection into the well, the valve plug, made in the form of a spherical segment, due to its shape, performs the function of a thin jet divider flowing out at a high speed from the calibrated orifice of the regulating fitting, thereby reducing pipe wear at the nozzle installation site.

The application of the proposed device will allow to solve the problem of improving the reliability of equipment for simultaneous and separate fluid injection by preventing formation contamination by injected liquid containing suspended solids, as well as eliminating formation self-discharge with the transfer of asphalt-resinous components into the well and fluid redistribution between the layers with different injectivity in the well.

Claims (1)

Wellhead equipment for simultaneous and separate injection of liquid, including parallel tubing columns connected to individual water conduit lines having individual fittings and flow meters and connected to a common water conduit, characterized in that a liquid purification filter is installed on the common water conduit, made in the form a truncated hollow cone with a small diameter of a truncated hollow cone, located opposite the fluid flow, the surface of the truncated hollow cone is equipped with filtering slots with a width of the filter slots less than the nozzle opening and a slot length 3-4 times longer than the width, each water line additionally contains a check valve, and the nozzle, check valve and flow meter are located on the water line in series with the flow of the injected fluid, and the check valve gates are made in the form of a spherical segment facing the flow of fluid flowing from a calibrated hole in the fitting.

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