RU183195U1 - VALVE RETURN UNIFIED - Google Patents

Abstract

The utility model relates to the oil and gas (mining) industry and can be used for the production of borehole products (mechanized, gas-lift method of operating wells).

Purpose of utility model:

1. Effective operation of submersible equipment in wells, the produced products of which (fluid) contain mechanical impurities, sand-abrasive, proppant.

2. The use of a check valve in sections of production casing with a deviation from the vertical (zenith angle) up to 90 degrees or more.

The goal is achieved:

1. The backpressure valve is combined with a self-cleaning sludge trap.

2. Installation of two locking devices (ball and cone types, both interconnected by a rod-pusher, and without it).

3. The installation of springs protected from abrasion and erosion for the effective operation of the locking devices of the valve and the possibility of using the valve when it deviates from the vertical to 90 degrees or more.

4. Installing a conical locking device inside the body of the sludge trap to ensure that it can be opened in the presence of dense and significant sedimentation of mechanical impurities in a self-cleaning container of the sludge trap.

5. Cleaning the sludge trap container with upward liquid energy through a non-return valve, breathing holes (or slit filter) and main flow openings in the lower part of the sludge trap body with further lifting of sediments from the container to the tubing and to the surface.

Thus, separation of mechanical impurities from the liquid is achieved and their sedimentation is ensured above the two-valve system of shut-off devices - in a self-cleaning container of the sludge trap, hermetic closure of the flow part by the lower shut-off device (ball-seat).

Description

Field of Technology:

The utility model relates to the oil and gas (mining) industry and can be used for the production of borehole products (mechanized, gas-lift method of operating wells).

The device is designed for efficient operation of submersible equipment in wells (increase in MTBF), the produced products of which (fluid) contain mechanical impurities, sand-abrasive, proppant, with the possibility of using a check valve in sections of production casing with a deviation from the vertical (zenith angle) up to 90 and more degrees.

The prior art:

The search for prototypes in the current level of technology for creating check valves for the oil industry showed the presence of five types of main directions for their creation. The classification is made according to the design of the locking element. Consider them:

1. Poppet type.

Known check valve installation of an electric centrifugal pump (utility model patent No. 152084 IPC F16K 15/00). Design flaws: a) there is no forced-return mechanism of the locking device; b) there is no protection of the movable element of the locking device of the valve, which leads to clogging and jamming of the movable element - plates and failure of the valve; c) there is no protection against settling of mechanical impurities from above onto the shut-off unit, which after stopping the pump and in the presence of significant and dense sedimentation above the valve on a large area of the upper surface of the plate makes it impossible to open the movable element - the plate of the locking unit, with the subsequent failure of the valve and all submersible equipment as a whole; d) the fragility of the rubber seal when operating in wells with a large depth of formation and increased pressure drops above and below the valve shutoff assembly; d) installation of the valve inside the electric centrifugal pump leads to a complication of the design of the pump; f) the installation of the valve inside the electric centrifugal pump when stopped leads to the deposition of mechanical impurities inside the pump and jamming of the pump shafts, the failure of the ESP equipment; g) the installation of the valve inside the electric centrifugal pump when the ESP is stopped under conditions of a large gas fluid factor and low pressure at the ESP input, leads to the filling of the pump working stages with gas (gas block) and the inability to start the ESP.

Known check valve borehole electric centrifugal pump (patent for invention No. 2187709 IPC F04D 15/02). Design flaws: a) there is no forced-return mechanism of the locking device; b) the valve is installed inside the module-head of the electric centrifugal pump without protection against settling of mechanical impurities from above onto the shut-off unit (valve-plug), which, after stopping the pump and in the presence of significant and dense sedimentation above the valve on a large area of the upper surface of the plug, makes it impossible to lift the plug and the opening of the flowing part of the movable element - plugs of the locking unit, with the subsequent failure of the valve and the entire submersible equipment as a whole; c) a plug valve is installed inside the module-head of the electric centrifugal pump and when the ESP stops in the conditions of a large gas fluid factor and low pressure at the ESP input, it leads to filling the pump working stages with gas (gas block) and the inability to start the ESP.

The above data significantly limit the possibility of using this type of valve, and as a result, they have not received widespread use in the oil industry.

2. Ball type.

Known check valve (patent for invention No. 2379566 IPC F16K 15/04).

Known check valve (patent for utility model No. 125248 IPC ЕВВ 34/08).

Known check valve (patent for utility model No. 56940 IPC EV21/06).

The design flaws of this type of valve are the same: a) there is no forced-return mechanism of the locking device; b) there is no device for sedimentation of mechanical impurities above the locking device of the valve, which leads to the deposition of mechanical impurities on the seat of the locking unit, as a result of which it is impossible to tightly fit the locking device, the valve does not provide tightness, the liquid is drained from the tubing through the pump into the well.

3. Ball type with sedimentation device of mechanical impurities - prototypes.

Known check valve (patent for utility model No. 176713 IPC ЕВВ 34/08, F16K 15/04). Design flaws: a) there is no forced-return mechanism of the locking device; b) when starting the pump, the opening of the flow part of the filter made of wire-permeable material (PPM) is carried out upward by the pressure of the liquid from the bottom of the pump, which, with dense and significant sedimentation of mechanical impurities from above on the PPM, over a large area of the upper surface of the PPM, makes it impossible to lift the PPM and opening the flow part of the moving PPM element, the ball of the locking device, with the subsequent failure of the valve and the entire submersible equipment as a whole. In this case, the velocity of the liquid from the pump up through the PPM will be completely insufficient for the successful erosion of dense deposits of mechanical impurities.

Known check valve for crimping submersible centrifugal pumps manufactured by Novomet-Perm. Design flaws: a) there is no forced-return mechanism of the locking device. The deviation of the wellbore from the vertical should be no more than 60 °. The catalog of products of Novomet-Perm CJSC July 2017, p. 126.

The known valve mechanism of a well pump with a sludge trap (utility model patent No. 59170 IPC F04D 15/02, E21 B 34/06). Design flaws: there is no self-cleaning of the sludge trap container.

Known borehole pumping unit with a sludge trap (patent for the invention No. 2135836 IPC F04D 13/10). Design flaws: a) there is no forced-return mechanism of the locking device; b) there is no self-cleaning of the container of the sludge trap.

Known sludge trap (patent for utility model No. 77916 IPC F04D 13/10). Design flaws: a) there is no forced-return mechanism of the locking device; b) there is no self-cleaning of the container of the sludge trap.

Well-known sludge trap for a well pump (utility model patent No. 154480 IPC F04B 47/02). Design flaws: a) there is no forced-return mechanism of the locking device; b) there is no self-cleaning of the container of the sludge trap.

4. Ball type with forced return of the ball to the saddle - prototypes.

Known check valve drilling (patent for utility model No. 99814 IPC E21 B 34/06). It cannot be used for the production of borehole products (fluid) in oil producing wells, as it is structurally designed for pumping fluid in the opposite direction.

Known check valve switched by flow (patent for invention No. 2358092 IPC ЕВВ 34/08). It can not be used for the production of borehole products (fluid) in oil wells, since there are structurally no threads for connecting the valve to the tubing.

Known check valve (patent for invention No. 2493355 IPC ЕВВ 34/06).

General design flaws of the presented types of valves: a) there is no device for sedimentation of mechanical impurities above the valve locking device, which leads to the deposition of mechanical impurities on the seating seat of the locking assembly, as a result of which the locking device cannot be sealed, the valve does not provide tightness, and liquid is drained from the tubing through pump into the well; b) the return spring is not provided with protection against abrasive-erosive wear by sand-abrasive contained in the pumped liquid.

Known self-adjusting valve of the deep pump (patent for invention No. 2382904 IPC F04B 53/00, F16K 15/04). Design drawback: there is no device for sedimentation of mechanical impurities above the rotating guide and the locking device of the valve, which leads to the deposition of mechanical impurities on the rotating mechanism and the landing seat of the locking unit and leads to jamming of the guide mounted on the central axis that rotates inside the housing due to gravity, as a result which makes the valve operation in horizontal wells impossible because the ball cannot fit into the saddle of the trap, and also leads to wasp waiting for solids on the seat of the locking assembly, as a result of which it is impossible to tightly fit the ball on the seat; under these conditions, the valve does not ensure the ball fits in the seat, the tightness of the locking device is impossible, fluid is drained from the tubing through the pump to the well. 5. Ball type with the ability to open the valve in the opposite direction.

Known check valve (patent for invention No. 2455546 IPC F16K 15/04, EV 34/06).

Known check valve (patent for invention No. 2544930 IPC ЕВВ 34/06).

Known check valve (patent for invention No. 2391592 IPC F16K 15/04, F04D 13/10, EV21/00).

This type of check valves is designed for the oil industry and can be used for production of well products, as well as for flushing and development of wells. The design flaws of this type of valve are the same: a) there is no forced-return mechanism of the locking device; b) there is no device for sedimentation of mechanical impurities above the locking device of the valve, which leads to the deposition of mechanical impurities on the seat of the locking unit, as a result of which the tight fit of the locking device is impossible, the valve does not provide tightness, fluid is drained from the tubing through the pump into the well; c) there is no adjustment of the valve opening force in the opposite direction, it is impossible to use in deep wells with high hydrostatic pressures inside the pipes, as this leads to unauthorized opening of the valve in the opposite direction and draining the fluid from the tubing through the pump to the well.

The above data significantly limit the possibility of using this type of valve, as a result of which they have not received widespread use in the oil industry.

Findings:

A common drawback of the types of valves discussed in paragraphs 1, 2, 4, 5 is the lack of a device for sedimentation of mechanical impurities above the locking device, which leads to the deposition of mechanical impurities on the landing seat of the valve locking device, as a result of which a tight fit of the locking device is impossible, the valve does not provides tightness; fluid is drained from the tubing through the pump into the well. To enable the use of valves of this type, it is mandatory to install additional equipment - sludge traps, which leads to the use of additional equipment and additional threaded connections in the tubing suspension.

A common drawback of the types of valves discussed in paragraphs 1, 2, 5 is the lack of a forced-return mechanism of the locking device, which makes it impossible to operate the valves in sections of production casing with a deviation from the vertical (zenith angle) of up to 90 degrees or more. The locking device does not close and fluid is drained from the tubing through the pump into the well.

A common drawback of the types of valves discussed in paragraphs 4 and 5 is the lack of protection of the return spring surface from abrasion and erosion by sand-abrasive contained in the pumped liquid.

Section 3 presents the types of valves with various drawbacks according to the varieties of technical characteristics.

Disclosure of utility model:

This utility model solves the problem of ensuring the operability of the check valve for submersible oil and gas production equipment under the following conditions: 1) the content of mechanical impurities in the pumped liquid, sand-abrasive, proppant, 2) the ability to operate the valve in sections of production casing with a deviation from the vertical (zenith angle) up to 90 and more degrees.

The goal is achieved:

1) Two devices are combined in one device: a check valve with a forced-return mechanism of a locking device and a self-cleaning sludge trap with a forced-return mechanism by opening and closing the flow channels for fluid flow.

2) The design of the two-valve device. The lower ball-type locking device (valve) is standard for ball check valves and is designed to tightly separate the tubing inside the tubing above and below the check valve. Above the ball valve, inside the lower part of the sludge trap, there is a cone-type upper locking device (valve) designed to provide sedimentation of mechanical impurities above the main valve (ball type) in a self-cleaning sludge trap container. Thus preventing the sedimentation of mechanical impurities on the seat of the ball valve.

3) Installing two springs (one on each locking device).

4) When the pump is operating and the lower and upper shut-off devices open, the springs are located in closed cavities and are not accessible for external negative abrasion-erosion by sand-abrasive contained in the pumped liquid.

5) The operability of the two-valve system of locking devices can be organized both with or without the use of a connecting rod-pusher. Design options are shown in figures No. 1, 2, 3, 4.

6) The sludge trap container is cleaned by the energy of an upward fluid flow from a working pump through a non-return valve, breathing openings (or a slit-like filter) and main flow openings in the lower part of the sludge trap body, with further rise of deposits from the container into the tubing and to the surface.

Thus, two devices are combined in this device: a check valve with a forced locking device mechanism and a self-cleaning sludge trap with internal forced opening and closing of flow channels for fluid flow. The conical, non-tight seat of the upper locking device inside the sludge trap provides ease of opening and closing without locking the upper locking device and the entire mechanism as a whole.

On the basis of which it can be considered that the presented work has an innovative level.

Brief Description of the Drawings:

The figure No. 1 presents a sketch of a check valve of a unified two-valve design with a connecting valve stem in the closed position. The figure No. 2 shows a sketch of a check valve of a unified two-valve design with a connecting valve stem in the open position, the arrow shows a diagram of the movement of fluid in the valve.

The figure No. 3 presents a sketch of a check valve of a unified two-valve design without using a connecting valve stem in the closed position. The figure No. 4 presents a sketch of a check valve of a unified two-valve design without using the connecting valve stem in the open position, the arrow shows a diagram of the movement of fluid in the valve.

The following details are numbered on the sketches:

1. Valve body, including upper and lower connecting threads. 2. The seat of the lower locking device. 3. Ball lower locking device. 4. The spring is returnable. 5. Sedo conical upper locking device. 6. The cone of the upper locking device. 7. Spring return upper locking device. 8. The connecting rod. 9. The ring. 10. The cone is transitional. 11. Sludge trap pipe. 12. Respiratory opening in the upper part of the sludge trap (closed by wire-permeable material or the opening is replaced by a slit-like filter).

In the upper part of the casing of the sludge trap pipe, a breathing hole is provided for equalizing the pressure during the working stroke of the cone of the upper locking device, for washing away mechanical impurities and lifting them from the container to the tubing.

Implementation of a utility model:

Description of the device during descent into the well and when the pump stops.

When lowering the submersible equipment into the well, with the help of connecting threads, the check valve is built into the tubing string. During the descent, it serves for interval testing of the tubing. When the pump stops, the upward flow of liquid stops and the pressure inside the tubing below the valve is equalized, and then it becomes less than the pressure of the hydrostatic column of liquid above the valve and the two-valve system of locking devices closes under the action of springs, closing the hermetically flowing part with the lower locking device (ball-seat) and separating mechanical impurities from the liquid by the upper locking device (conical) to ensure their sedimentation above the two-valve system of locking devices - in self-cleaning sludge trap container. Thus preventing the sedimentation of mechanical impurities on the seat of the ball valve.

Description of the device during pump operation.

When the pump is started, the increasing pressure of the upward fluid flow in the tubing below the valve reaches and then exceeds the pressure of the hydrostatic column of fluid inside the tubing above the valve. The ball compresses the spring of the lower locking device, while the whole spring is placed in the groove intended for this and is closed by a rubber shock absorber. What provides protection of the spring from abrasive-erosive wear by sand-abrasive contained in the pumped liquid. Pressure equalization inside and outside the sludge trap is carried out through the breathing hole (or slit filter) in the upper part of the sludge trap body. Locking devices open the flow part of the valves for free flow of fluid along the tubing up to the wellhead. The sludge trap container is cleaned by the energy of an upward fluid flow from a working pump through a non-return valve, breathing openings (or a slit-like filter) and main flow openings in the lower part of the sludge trap body, with further rise of deposits from the container into the tubing and to the surface.

Thus, the device ensures the long-term operation of the submersible equipment by increasing the operational reliability of the check valve, ensures that fluid is kept in the tubing string after the pump stops even when it deviates from the vertical (zenith angle) to 90 degrees or more, and also prevents the submersible equipment from becoming clogged with mechanical impurities , which leads to an increase in the period of stable operation of the equipment, an increase in the overhaul period, a decrease in the cost of repairing wells and as a result, Dye the cost of production of fluids.

Claims (1)

Non-return valve, characterized in that it is combined with a sludge trap for sedimentation of mechanical impurities in a self-cleaning container and two locking devices - ball and cone types, both connected together by a push rod and without it, with springs protected from abrasion and erosion for effective operation of shut-off devices of the check valve when it deviates from the vertical up to 90 degrees or more with sedimentation of mechanical impurities above the upper shut-off device of a different type - in a self-cleaning container of the sludge trap by installing a conical locking device inside the body of the sludge trap and supplemented with breathing holes or a slit-like filter in the upper part of the casing, thereby preventing sedimentation of mechanical impurities on the ball valve seat.

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