CN111042765A - Underground flow control valve - Google Patents
Underground flow control valve Download PDFInfo
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- CN111042765A CN111042765A CN202010047360.2A CN202010047360A CN111042765A CN 111042765 A CN111042765 A CN 111042765A CN 202010047360 A CN202010047360 A CN 202010047360A CN 111042765 A CN111042765 A CN 111042765A
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 39
- 239000003921 oil Substances 0.000 claims description 202
- 239000007788 liquid Substances 0.000 claims description 39
- 239000012530 fluid Substances 0.000 claims description 24
- 239000010720 hydraulic oil Substances 0.000 claims description 14
- 230000004323 axial length Effects 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 210000000078 claw Anatomy 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 15
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000010727 cylinder oil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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Abstract
The invention discloses an underground flow control valve which comprises an upper valve body, a first-stage hydraulic cylinder inner cylinder, a first-stage piston, a second-stage piston, a lower valve body and a throttle valve sleeve, wherein the upper valve body is connected with the first-stage hydraulic cylinder inner cylinder; the first-stage hydraulic cylinder inner cylinder is arranged inside the upper valve body; the first-stage piston is arranged in the upper valve body, a first oil cavity is defined by a first step end face of the first-stage hydraulic cylinder inner cylinder and an outer peripheral wall thereof, and a first oil cavity is defined by the upper valve body and the first-stage piston, a second oil cavity is defined by an outer peripheral wall of the first-stage hydraulic cylinder inner cylinder and a second step end face thereof, and a second oil cavity is defined by an inner peripheral wall of the first-stage piston and a first step end face thereof, the second-stage piston is arranged in the upper valve body, a third oil cavity is defined by a second step end face of the first-stage piston and an outer peripheral wall thereof, and a fourth oil cavity is defined by a third step end face of the first-stage piston and an outer peripheral wall thereof; the lower valve body is connected to the other end of the upper valve body, and the throttle valve sleeve is fixedly arranged in the lower valve body.
Description
Technical Field
The invention relates to an underground flow control valve, in particular to an underground flow control valve device of a multi-opening intelligent well completion system applied to petroleum well drilling and completion and oil and gas exploitation.
Background
The intelligent well completion technology mainly realizes remote control of the underground flow control valve through hydraulic power, can control the layered production flow of the underground oil-gas layer on the ground, and realizes the random switching of multiple production modes such as multilayer commingled production, interlayer optimization and the like. By adopting an intelligent well completion technology, the flow of the downhole production zone can be controlled, and if the production zone is only required to be opened or closed, the flow can be controlled by using downhole flow control valves with two opening degrees; two degree flow control valves are clearly not possible if a single zone flow is to be controlled more accurately. The patent CN201410618870.5 adopts a J-shaped groove, different opening degrees of the fracturing sliding sleeve are realized through rotation, and if hydraulic control is adopted, multi-stage switch fracturing of the underground fracturing sliding sleeve can be realized only by repeated positive and negative pressing; the CN201720642612.X adopts electric control to realize the opening and closing of the sliding sleeve, needs electric components, and has the durability which is not easy to meet in a high-temperature and high-pressure environment in a well.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide a downhole flow control valve that can more accurately control individual zone flows.
In order to achieve the purpose, the invention adopts the following technical scheme, and the underground flow control valve is characterized in that: the hydraulic control valve comprises an upper valve body, a first-stage hydraulic cylinder inner cylinder, a first-stage piston, a second-stage piston, a lower valve body and a throttle valve sleeve;
the first-stage hydraulic cylinder inner cylinder is fixedly arranged inside the upper end of the upper valve body; the first-stage piston is axially arranged in the upper valve body in a sliding manner, the upper part of the first-stage piston is movably sleeved outside the first-stage hydraulic cylinder inner cylinder, and the upper valve body, the first-stage hydraulic cylinder inner cylinder and the first-stage piston jointly form a first-stage hydraulic cylinder;
the second-stage piston is axially and slidably arranged in the upper valve body, the upper part of the second-stage piston is movably sleeved outside the lower part of the first-stage piston, and a second-stage hydraulic cylinder is formed among the upper valve body, the first-stage piston and the second-stage piston. A third oil chamber is defined by the second step end face and the outer peripheral wall of the first-stage piston, the inner peripheral wall of the upper valve body and the upper end face of the second-stage piston, and a fourth oil chamber is defined by the third step end face and the outer peripheral wall of the first-stage piston, the first step end face and the inner peripheral wall of the second-stage piston;
the lower valve body is fixedly connected to the lower end of the upper valve body, and a throttling opening is processed on the lower valve body; the throttle valve sleeve is fixedly arranged in the lower valve body, a rectifying port which is correspondingly communicated with the throttle port is processed on the throttle valve sleeve, and the lower part of the second-stage piston movably extends into the throttle valve sleeve.
Furthermore, a first liquid flow channel, a second liquid flow channel, a third liquid flow channel and a fourth liquid flow channel are arranged on the valve wall of the upper valve body at intervals, and the first liquid flow channel, the second liquid flow channel, the third liquid flow channel and the fourth liquid flow channel are respectively connected with a hydraulic pipeline;
an oil passage communicated with the first liquid flow passage is formed in the inner cylinder of the first-stage hydraulic cylinder, an inner annular oil groove communicated with the oil passage and a second oil chamber in the first-stage hydraulic cylinder is formed in the inner peripheral wall of the upper part of the first-stage piston, and the axial length of the inner annular oil groove can ensure that the first liquid flow passage can be communicated with the second oil chamber in the first-stage hydraulic cylinder through the oil passage and the inner annular oil groove when the first-stage piston moves to any position in the upper valve body;
the second fluid channel is communicated with the first oil chamber;
a first outer annular oil groove which is communicated with the third liquid flow channel and the third oil chamber is formed in the outer peripheral wall of the upper portion of the first-stage piston, and the axial length of the first outer annular oil groove can ensure that the third liquid flow channel can be communicated with the third oil chamber through the first outer annular oil groove when the first-stage piston moves to any position in the upper valve body;
and a radial oil hole communicated with the fourth oil cavity is formed in the piston wall on the upper part of the second-stage piston, a second outer annular oil groove communicated with the fourth liquid flow channel and the radial oil hole is formed in the outer peripheral wall on the upper part of the second-stage piston, the axial length of the second outer annular oil groove can ensure that the first-stage piston and the second-stage piston move to any position in the upper valve body, and the fourth liquid flow channel can be communicated with the fourth oil cavity through the second outer annular oil groove and the radial oil hole.
Furthermore, a first oil inlet groove is formed in the end face of a first step of the first-stage piston, and is used for communicating the first liquid flow channel with the second oil cavity through the oil channel, the inner annular oil groove and the first oil inlet groove when the first-stage piston axially moves to a lower limit position in the upper valve body;
a second oil inlet groove is formed in the end face of a second step of the first-stage piston, and the third oil flow channel is communicated with the third oil chamber through the first outer annular oil groove and the second oil inlet groove when the volume of the third oil chamber is minimum;
and a third oil inlet groove is formed in the end face of a third step of the first-stage piston, and the fourth liquid flow channel is communicated with the fourth oil chamber through the second outer annular oil groove, the radial oil hole and the third oil inlet groove when the volume of the fourth oil chamber is minimum.
Further, the external diameter of the lower part of second level piston is less than the external diameter on upper portion, form the step between the upper portion of second level piston and the lower part, enclose into the oil return cavity between the terminal surface of step, the periphery wall of the lower part of second level piston, the internal perisporium of going up the valve body, the internal perisporium of lower valve body, the up end of throttle valve cover, it is full of hydraulic oil to return in the oil return cavity set up on the valve wall of going up the valve body with the fifth liquid flow channel of oil return cavity intercommunication, fifth liquid flow channel and a hydraulic pressure pipeline intercommunication.
Furthermore, the rectifying port comprises a plurality of rectifying hole groups which are axially arranged on the side wall of the throttle valve sleeve at intervals, and each rectifying hole group comprises a plurality of radial rectifying holes which are circumferentially arranged at intervals along the throttle valve sleeve.
Furthermore, the rectifying port comprises four groups of rectifying hole groups which are axially arranged on the side wall of the throttle valve sleeve at intervals.
Furthermore, a mechanical driving groove matched with the mechanical claw is formed in the inner peripheral wall of the second-stage piston.
And the lower valve body is fixedly arranged in the lower valve body and is in close contact with the lower end surface of the throttle valve sleeve.
Further, the upper valve body is fixedly connected with the lower valve body through a pin, the lower valve body is fixedly connected with the throttle valve sleeve through a pin, and the upper valve body is fixedly connected with the first-stage hydraulic cylinder inner cylinder through a pin or a screw.
By adopting the technical scheme, the invention has the following advantages: 1. according to the invention, the first-stage piston and the second-stage piston are driven to move through hydraulic pressure, and the movement strokes of the first-stage piston and the second-stage piston are overlapped, so that the opening degree of the rectifying port on the throttling valve sleeve is adjusted, and the flow of a single stratum is controlled more accurately.
2. The invention comprises an upper valve body, a first-stage hydraulic cylinder inner cylinder, a first-stage piston, a second-stage piston, a lower valve body and a throttle valve sleeve; the upper valve body is connected with the lower valve body through a pin, the first-stage hydraulic inner cylinder is fixed in the upper valve body, the upper part of the first-stage piston is movably sleeved outside the first-stage hydraulic cylinder inner cylinder, and the upper valve body, the first-stage hydraulic inner cylinder and the first-stage piston jointly form a first-stage hydraulic cylinder; the second-stage piston is axially slidably arranged in the upper valve body, the upper part of the second-stage piston is movably sleeved outside the lower part of the first-stage piston, the upper valve body, a second-stage hydraulic cylinder is formed between the first-stage piston and the second-stage piston, the throttle valve sleeve is fixedly arranged in the lower valve body, a throttle orifice is processed on the lower valve body, a rectifying port communicated with the throttle orifice in a corresponding mode is processed on the throttle valve sleeve, the lower part of the second-stage piston movably extends into the throttle valve sleeve, the whole control valve is reasonable and compact in structure, convenient to use, simple and practical in motion principle of each part, convenient to operate and low in processing cost, hydraulic pressure is adopted for remote control, high safety performance is achieved, and working efficiency is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic illustration of the construction of the first stage piston of the present invention;
FIG. 3 is a schematic diagram of the construction of the second stage piston of the present invention;
FIG. 4 is a schematic view of the present invention in a fully closed state;
FIG. 5 is a schematic view of the present invention at a second opening;
FIG. 6 is a schematic view of the present invention at a third opening;
fig. 7 is a schematic view of the present invention at a fourth opening angle (fully open state).
In the figure, 1, an upper valve body; 2. a first-stage hydraulic cylinder inner cylinder; 3. a first flow channel; 4. a second liquid flow passage; 5. a first oil chamber; 6. a first stage piston; 7. a second oil chamber; 8. a third flow channel; 9. a third oil chamber; 10. a fourth oil chamber; 11. a fourth flow channel; 12. a second stage piston; 13. an oil return chamber; 14. a fifth flow channel; 15. a lower valve body; 16. a throttle valve sleeve; 17. a rectifying port; 171. a group of rectifying holes; 1711. a radial flow straightening hole; 18. a choke; 19. sealing the valve seat; 20 and 21, pins; 22. a mechanical drive slot; 23. a third oil inlet groove; 24. a radial oil hole; 25. a second outer annular oil groove; 26. a second oil inlet groove; 27. a first outer annular oil groove; 28. a first oil inlet groove; 29. an inner annular oil groove; 30. an oil passage; 31. a pin or a screw.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "front", "rear", and the like, indicate orientations or positional relationships based on those shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, the downhole flow control valve provided by the invention comprises an upper valve body 1, a first-stage hydraulic cylinder inner cylinder 2, a first-stage piston 6, a second-stage piston 12, a lower valve body 15 and a throttle valve sleeve 16;
the first-stage hydraulic cylinder inner cylinder 2 is fixedly arranged inside the upper end of the upper valve body 1; the first-stage piston 6 is axially arranged in the upper valve body 1 in a sliding manner, and the upper part of the first-stage piston 6 is movably sleeved outside the first-stage hydraulic cylinder inner cylinder 2, and the first-stage piston form a first-stage hydraulic cylinder together, wherein a first oil chamber 5 is defined between the first step end surface and the outer peripheral wall of the first-stage hydraulic cylinder inner cylinder 2, the inner peripheral wall of the upper valve body 1 and the upper end surface of the first-stage piston 6, and a second oil chamber 7 is defined between the outer peripheral wall and the second step end surface of the first-stage hydraulic cylinder inner cylinder 2, the inner peripheral wall of the first-stage piston 6 and the;
the second-stage piston 12 is axially and slidably arranged in the upper valve body 1, the upper part of the second-stage piston 12 is movably sleeved outside the lower part of the first-stage piston 6, a second-stage hydraulic cylinder is formed among the upper valve body 1, the first-stage piston 6 and the second-stage piston 12, at the moment, the first-stage piston 6 is an inner cylinder of the second-stage hydraulic cylinder, a third oil chamber 9 is formed by surrounding a second step end face and an outer peripheral wall of the first-stage piston 6, an inner peripheral wall of the upper valve body 1 and an upper end face of the second-stage piston 12, and a fourth oil chamber 10 is formed by surrounding a third step end face and an outer peripheral wall of the first-stage piston 6, a first step end face and an inner peripheral wall of;
the lower valve body 15 is fixedly connected with the lower end of the upper valve body 1, and a throttling opening 18 is processed on the lower valve body 15; the throttle valve sleeve 16 is fixedly arranged in the lower valve body 15, a rectifying port 17 correspondingly communicated with the throttle port 18 is processed on the throttle valve sleeve 16, and the lower part of the second-stage piston 12 movably extends into the throttle valve sleeve 16.
When the device is used, the first-stage piston 6 and the second-stage piston 12 have different stroke combinations in the upper valve body 1 through the matching of the alternating oil inlet and outlet of the first oil chamber 5 and the second oil chamber 7 in the first-stage hydraulic cylinder and the alternating oil inlet and outlet of the third oil chamber 9 and the fourth oil chamber 10 in the second-stage hydraulic cylinder, so that the lower part of the second-stage piston 12 has different movement strokes in the throttle valve sleeve 16, namely the lower part of the second-stage piston 12 has different degrees of shielding on the overflowing area of the rectifying port 17, namely the opening degree of the rectifying port 17 can be changed, and the flow of a single birth zone is controlled more accurately.
In a preferred embodiment, as shown in fig. 1 to 3, a first flow channel 3, a second flow channel 4, a third flow channel 8 and a fourth flow channel 11 are arranged on the valve wall of the upper valve body 1 at intervals, and the first flow channel 3, the second flow channel 4, the third flow channel 8 and the fourth flow channel 11 are respectively connected with a hydraulic pipeline; an oil channel 30 communicated with the first liquid flow channel 3 is arranged in the first-stage hydraulic cylinder inner cylinder 2, an inner annular oil groove 29 communicated with the oil channel 30 and the second oil chamber 7 in the first-stage hydraulic cylinder is formed in the inner peripheral wall of the upper part of the first-stage piston 6, and the axial length of the inner annular oil groove 29 can ensure that the first liquid flow channel 3 can be communicated with the second oil chamber 7 in the first-stage hydraulic cylinder through the oil channel 30 and the inner annular oil groove 29 when the first-stage piston 6 moves to any position in the upper valve body 1; the second fluid passage 4 is communicated with the first oil chamber 5; a first outer annular oil groove 27 communicating the third fluid passage 8 and the third oil chamber 9 is formed on the outer peripheral wall of the upper portion of the first-stage piston 6, and the axial length of the first outer annular oil groove 27 can ensure that the third fluid passage 8 can communicate with the third oil chamber 9 through the first outer annular oil groove 27 when the first-stage piston 6 moves to any position in the upper valve body 1; a radial oil hole 24 communicated with the fourth oil chamber 10 is formed in the piston wall of the upper portion of the second-stage piston 12, a second outer annular oil groove 25 communicated with the fourth liquid flow channel 11 and the radial oil hole 24 is formed in the outer peripheral wall of the upper portion of the second-stage piston 12, the axial length of the second outer annular oil groove 25 can ensure that the first-stage piston 6 and the second-stage piston 12 move to any position in the upper valve body 1, and the fourth liquid flow channel 11 can be communicated with the fourth oil chamber 10 through the second outer annular oil groove 25 and the radial oil hole 24.
In a preferred embodiment, a first oil inlet groove 28 is formed in the first step end surface of the first-stage piston 6, for communicating the first fluid passage 3 with the second oil chamber 7 through the oil passage 30, the inner annular oil groove 29 and the first oil inlet groove 28 when the first-stage piston 6 moves axially in the upper valve body 1 to the lower limit position (bottom dead center); a second oil inlet groove 26 is formed in the end face of the second step of the first-stage piston 6 and used for communicating the third fluid flow passage 8 with the third oil chamber 9 through the first outer annular oil groove 27 and the second oil inlet groove 26 when the volume of the third oil chamber 9 is minimum; a third oil inlet groove 23 is formed in the third step end surface of the first-stage piston 6 for communicating the fourth fluid passage 11 with the fourth oil chamber 10 through the second outer annular oil groove 25, the radial oil holes 24, and the third oil inlet groove 23 when the volume of the fourth oil chamber 10 is the smallest.
In a preferred embodiment, the outer diameter of the lower part of the second-stage piston 12 is smaller than that of the upper part thereof, a step is formed between the upper part and the lower part of the second-stage piston 12, an oil return chamber 13 is defined between the end surface of the step, the outer peripheral wall of the lower part of the second-stage piston 12, the inner peripheral wall of the upper valve body 1, the inner peripheral wall of the lower valve body 15 and the upper end surface of the throttle sleeve 16, the oil return chamber 13 is filled with hydraulic oil, a fifth flow channel 14 communicated with the oil return chamber 13 is formed on the valve wall of the upper valve body 1, and the fifth flow channel 14 is connected with a hydraulic pipeline.
In a preferred embodiment, the rectifying port 17 comprises a plurality of rectifying hole groups 171 axially spaced on the side wall of the throttle sleeve 16, each rectifying hole group 171 comprises a plurality of radial rectifying holes 1711 circumferentially spaced along the throttle sleeve 16, and the size and number of the radial rectifying holes 1711 can be adjusted according to the downhole production requirement.
In a preferred embodiment, the commutating port 17 comprises four groups 171 of commutating holes axially spaced in the side wall of the throttle sleeve 16.
In a preferred embodiment, the inner peripheral wall of the second-stage piston 12 is provided with a mechanical driving groove 22 matched with a mechanical jaw, when the hydraulic driving mode fails, the mechanical jaw can be lowered from the ground through the interior of the production string, the mechanical jaw can be clamped in the mechanical driving groove 22, the second-stage piston 12 moves in the throttle valve sleeve 16 through the lifting and lowering of the mechanical jaw, so that the full opening or the full closing of the rectifying port 17 is realized, namely, a corresponding production zone is opened or closed, and the safety and the reliability of the downhole flow control valve are improved.
In a preferred embodiment, the present invention further includes a sealing valve seat 19, and the sealing valve seat 19 is fixedly disposed in the lower valve body 15 and is in close contact with the lower end surface of the throttle sleeve 16.
In a preferred embodiment, the upper valve body 1 and the lower valve body 15 are fixedly connected by a pin 21, the lower valve body 15 and the throttle sleeve 16 are fixedly connected by a pin 20, and the upper valve body 1 and the first-stage cylinder inner barrel 2 are fixedly connected by a pin or a screw 31.
The following description will be made on the working principle of the present invention by taking the rectifying port 17 as an example including four rectifying hole groups 171 axially spaced on the side wall of the throttle valve sleeve 16, and referring to fig. 4 to 7:
the up-and-down movement strokes of the first-stage piston 6 and the second-stage piston 12 are strictly calculated, and the up-and-down movement strokes are only in two states: an upper limit position (top dead center) and a lower limit position (bottom dead center) that ultimately allows for accurate control of the displacement of the second stage piston 12, and the relative position between the second stage piston 12 and the throttle sleeve 16 affects the number of sets of the set of commutating holes 171 that communicate the commutating ports 17 with the bottom hole fluid. Here, only the number of sets of communication between one of the orifice groups 171 of the orifice 18 and the orifice 17, that is, the number of sets of the orifice groups 171 communicating with the orifice 18 is controlled to realize four different opening degrees, wherein the number of sets of the orifice groups 171 communicating with the orifice 18 in the fully closed state is 0, the number of sets of the orifice groups 171 communicating with the orifice 18 in the second opening degree is 2, the number of sets of the orifice groups 171 communicating with the orifice 18 in the third opening degree is 3, and the number of sets of the orifice groups 171 communicating with the orifice 18 in the fully open state is 4.
As shown in fig. 4, in the fully closed state, the high-pressure hydraulic oil in one hydraulic line enters the first oil chamber 5 of the first-stage hydraulic cylinder through the second fluid passage 4 on the upper valve body 1, and pushes the first-stage piston 6 of the first-stage hydraulic cylinder to move downward to the lower limit position, and simultaneously, the low-pressure oil in the second oil chamber 7 of the first-stage hydraulic cylinder is discharged back to the ground oil tank through the inner annular oil groove 29 on the first-stage piston 6, the oil passage 30 in the inner cylinder 2 of the first-stage hydraulic cylinder, the first fluid passage 3 on the upper valve body 1 and the hydraulic line communicated with the first fluid passage 3; and the high-pressure hydraulic oil of the other hydraulic line enters the second oil chamber 9 of the second-stage hydraulic cylinder through the third flow passage 8 on the upper valve body 1 and the first outer annular oil groove 27 on the first-stage piston 6, the second-stage piston 12 of the second-stage hydraulic cylinder is pushed to move downwards to the lower limit position, and the oil in the fourth oil chamber 10 of the second-stage hydraulic cylinder is discharged back to the ground oil tank through the radial oil hole 24 on the second-stage piston 12, the second outer annular oil groove 25 on the second-stage piston 12, the fourth flow passage 11 on the upper valve body 1 and the hydraulic line communicated with the fourth flow passage 11. At this time, the first-stage piston 6 and the second-stage piston 12 both reach the lower limit (bottom dead center) position in the hydraulic cylinder, the downward stroke of the superposed second-stage piston 12 is the largest, the rectifying port 17 is completely shielded by the lower part of the second-stage piston 12, the fluid in the well cannot enter the throttle valve sleeve 16, and at this time, the flow control valve is in a fully closed state.
As shown in fig. 5, in the second opening state, high-pressure hydraulic oil in one hydraulic line enters the second oil chamber 7 of the first-stage hydraulic cylinder through the first fluid passage 3 on the upper valve body 1, the oil passage 30 in the inner cylinder 2 of the first-stage hydraulic cylinder, and the inner annular passage 29 on the first-stage piston 6, pushes the first-stage piston 6 of the first-stage hydraulic cylinder to move upward to the upper limit position, and the oil in the first oil chamber 5 of the first-stage hydraulic cylinder is discharged back to the ground oil tank through the second fluid passage 4 and the hydraulic line communicated with the second fluid passage 4; and the high-pressure hydraulic oil of the other hydraulic line enters the third oil chamber 9 of the second-stage hydraulic cylinder through the third flow passage 8 and the first outer annular oil groove 27 on the first-stage piston 6 to push the second-stage piston 12 of the second-stage hydraulic cylinder to move downwards to the stroke end, and the hydraulic oil of the fourth oil chamber 10 of the second-stage hydraulic cylinder is discharged to the second outer annular oil groove 25 through the radial oil hole 24 of the second-stage piston 12 and then discharged back to the ground oil tank through the fourth flow passage 11 and the hydraulic line communicated with the fourth flow passage 11. At this time, the first-stage piston 6 is located at the top dead center position of the first-stage hydraulic cylinder, the second-stage piston 12 is located at the bottom dead center position of the second-stage hydraulic cylinder, and the strokes of the first-stage piston 6 and the second-stage piston 12 are overlapped, so that the lower part of the second-stage piston 12 shields part of the rectifying ports 17, and the two groups of rectifying hole groups 171 are shielded by the second-stage piston 12, thereby regulating the flow rate of production fluid in the well entering the downhole flow control valve, and realizing the second opening degree of the flow control of the downhole flow control valve.
As shown in fig. 6, in the third opening state, high-pressure hydraulic oil in one hydraulic line enters the first oil chamber 5 of the first-stage hydraulic cylinder from the second flow channel 4, and pushes the first-stage piston 6 of the first-stage hydraulic cylinder to move downward to the stroke end of the first-stage hydraulic cylinder, and hydraulic oil in the second oil chamber 7 of the first-stage hydraulic cylinder is discharged to the first flow channel 3 through the inner annular oil groove 29 of the first-stage piston 6 and the oil channel 30 in the inner cylinder 2 of the first-stage hydraulic cylinder, and then is discharged back to the ground oil tank through the hydraulic line communicated with the first flow channel 3; and the high-pressure hydraulic oil of the other hydraulic line enters the fourth oil chamber 10 of the second-stage hydraulic cylinder through the fourth flow passage 11 and the radial oil hole 24 on the second-stage piston 12, and pushes the second-stage piston 12 of the second-stage hydraulic cylinder to move upwards to the top dead center of the second-stage hydraulic cylinder, and the hydraulic oil of the third oil chamber 9 of the second-stage hydraulic cylinder is discharged back to the ground oil tank through the first outer annular oil groove 27 of the second-stage piston 12, the third oil passage 8 and the hydraulic line communicated with the third flow passage 8. At this time, the first-stage piston 6 is located at the bottom dead center position of the first-stage hydraulic cylinder, the second-stage piston 12 is located at the top dead center position of the second-stage hydraulic cylinder, and the strokes of the first-stage piston 6 and the second-stage piston 12 are overlapped, so that the lower part of the second-stage piston 12 shields part of the rectifying ports 17, and only one group of rectifying hole groups 171 is shielded by the second-stage piston 12, thereby regulating the flow rate of production fluid in the well entering the downhole flow control valve, and realizing the third opening degree of the flow control of the downhole flow control valve.
As shown in fig. 7, in the fourth opening (fully open) state, the high-pressure hydraulic oil of one hydraulic line enters the second oil chamber 7 of the first stage hydraulic cylinder through the first fluid passage 3, the oil passage 30 inside the inner cylinder 2 of the first stage hydraulic cylinder and the inner annular oil groove 29 on the first stage piston 6, the first stage piston 6 of the first stage hydraulic cylinder is pushed to move upwards to the top dead center of the first stage hydraulic cylinder, and the oil in the first oil chamber 5 of the first stage hydraulic cylinder is discharged back to the ground oil tank through the second fluid passage 4 and the hydraulic line communicated with the second fluid passage 4; and the high-pressure hydraulic oil of the other hydraulic line is pushed to move the second-stage piston 12 of the second-stage hydraulic cylinder upwards to the stroke end of the second-stage hydraulic cylinder through the fourth liquid flow channel 11, the second outer annular oil groove 25 on the second-stage piston 12, the radial oil hole 24 of the second-stage piston 12 and the fourth oil cavity 10 of the second-stage hydraulic cylinder, and the oil in the third oil cavity 9 of the second-stage hydraulic cylinder is discharged back to the ground oil tank through the first outer annular oil groove 27 on the second-stage piston 12, the third liquid flow channel 8 and the hydraulic line communicated with the third liquid flow channel 8. At this time, the position of the first-stage piston 6 is at the top dead center of the first-stage hydraulic cylinder, the position of the second-stage piston 12 is at the top dead center of the second-stage hydraulic cylinder, and the strokes of the first-stage piston 6 and the second-stage piston 12 are overlapped, so that the lower part of the second-stage piston 12 does not shield the rectifying port 17, the flow of the production fluid in the well entering the underground flow control valve is maximum, namely the underground flow control valve is fully opened, and the fourth opening degree of the flow control of the underground flow control valve is realized. At this point the oil and gas production reaches the rated maximum production flow.
The emergency standby control scheme of the invention has the following principle: the inner wall of the second stage piston 12 is provided with a mechanical driving groove 22, so that when the hydraulic driving mode fails, a mechanical jaw can be lowered from the ground through the interior of the production string, the jaw can be clamped in the mechanical driving groove 22, the second stage piston 12 can be pushed to move in a mechanical mode by lifting and lowering, and the production zone can be opened or closed, so that the reliability of the downhole flow control valve is improved.
In summary, the downhole flow control valve has a combination of four degrees of openness, and the operation of the downhole flow control valve of four degrees of openness, as shown in table 1,
TABLE 1 Quadrature downhole flow control valve device operating sequence
| Opening degree serial number | 3 | 4 | 8 | 11 | 14 |
| Opening degree 1 | - | + | + | - | - |
| Opening 2 | + | - | + | - | - |
| Opening degree 3 | - | + | - | + | - |
| Opening degree 4 | + | - | - | + | - |
"+" indicates oil intake, "-" indicates oil return, "3, 4, 8, 11, 14" indicates the first to fifth flow paths, respectively.
The present invention has been described with reference to the above embodiments, and the structure, arrangement, and connection of the respective members may be changed. On the basis of the technical scheme of the invention, the improvement or equivalent transformation of the individual components according to the principle of the invention is not excluded from the protection scope of the invention.
Claims (9)
1. A downhole flow control valve, comprising: the hydraulic control valve comprises an upper valve body (1), a first-stage hydraulic cylinder inner cylinder (2), a first-stage piston (6), a second-stage piston (12), a lower valve body (15) and a throttle valve sleeve (16);
the first-stage hydraulic cylinder inner cylinder (2) is fixedly arranged inside the upper end of the upper valve body (1); the first-stage piston (6) is axially arranged in the upper valve body (1) in a sliding manner, the upper part of the first-stage piston (6) is movably sleeved outside the first-stage hydraulic cylinder inner cylinder (2), the upper valve body (1), the first-stage hydraulic cylinder inner cylinder (2) and the first-stage piston (6) jointly form a first-stage hydraulic cylinder, a first oil cavity (5) is defined among a first step end surface and an outer peripheral wall of the first-stage hydraulic cylinder inner cylinder (2), an inner peripheral wall of the upper valve body (1) and an upper end surface of the first-stage piston (6), and a second oil cavity (7) is defined among an outer peripheral wall and a second step end surface of the first-stage hydraulic cylinder inner cylinder (2), an inner peripheral wall of the first-stage piston (6) and the first step end surface of the first-stage piston;
a second-stage piston (12) is axially and slidably arranged in the upper valve body (1), the upper part of the second-stage piston (12) is movably sleeved outside the lower part of the first-stage piston (6), a second-stage hydraulic cylinder is formed among the upper valve body (1), the first-stage piston (6) and the second-stage piston (12), a third oil chamber (9) is defined among a second step end surface and an outer peripheral wall of the first-stage piston (6), an inner peripheral wall of the upper valve body (1) and an upper end surface of the second-stage piston (12), and a fourth oil chamber (10) is defined among a third step end surface and an outer peripheral wall of the first-stage piston (6), a first step end surface of the second-stage piston (12) and an inner peripheral wall of the third-stage end surface;
the lower valve body (15) is fixedly connected to the lower end of the upper valve body (1), and a throttling opening (18) is machined in the lower valve body (15); the throttle valve sleeve (16) is fixedly arranged in the lower valve body (15), a rectifying port (17) correspondingly communicated with the throttle port (18) is processed on the throttle valve sleeve (16), and the lower part of the second-stage piston (12) movably extends into the throttle valve sleeve (16).
2. A downhole flow control valve according to claim 1, wherein:
a first liquid flow channel (3), a second liquid flow channel (4), a third liquid flow channel (8) and a fourth liquid flow channel (11) are arranged on the valve wall of the upper valve body (1) at intervals, and the first liquid flow channel (3), the second liquid flow channel (4), the third liquid flow channel (8) and the fourth liquid flow channel (11) are respectively connected with a hydraulic pipeline;
an oil channel (30) communicated with the first liquid flow channel (3) is formed in the first-stage hydraulic cylinder inner cylinder (2), an inner annular oil groove (29) communicated with the oil channel (30) and a second oil cavity (7) in the first-stage hydraulic cylinder is formed in the inner peripheral wall of the upper part of the first-stage piston (6), and the axial length of the inner annular oil groove (29) can ensure that the first liquid flow channel (3) can be communicated with the second oil cavity (7) in the first-stage hydraulic cylinder through the oil channel (30) and the inner annular oil groove (29) when the first-stage piston (6) moves to any position in the upper valve body (1); the second fluid channel (4) is communicated with the first oil chamber (5);
a first outer annular oil groove (27) communicating the third flow channel (8) and the third oil chamber (9) is formed on the outer peripheral wall of the upper part of the first-stage piston (6), and the axial length of the first outer annular oil groove (27) can ensure that the third flow channel (8) can be communicated with the third oil chamber (9) through the first outer annular oil groove (27) when the first-stage piston (6) moves to any position in the upper valve body (1);
set up on the piston wall on the upper portion of second level piston (12) with radial oilhole (24) of fourth oil pocket (10) intercommunication form the intercommunication on the periphery wall on the upper portion of second level piston (12) the outer annular oil groove (25) of second of fourth fluid flow channel (11) and radial oilhole (24), just the axial length of the outer annular oil groove of second (25) can guarantee first order piston (6) and second level piston (12) are in go up valve body (1) internal motion to optional position, fourth fluid circulation pipeline (11) homoenergetic is passed through the outer annular oil groove of second (25), radial oilhole (24) with fourth oil pocket (10) intercommunication.
3. A downhole flow control valve according to claim 2, wherein:
a first oil inlet groove (28) is formed in the end face of a first step of the first-stage piston (6), and when the first-stage piston (6) axially moves to a lower limit position in the upper valve body (1), the first liquid flow channel (3) is communicated with the second oil cavity (7) through the oil channel (30), the inner annular oil groove (29) and the first oil inlet groove (28);
a second oil inlet groove (26) is formed in the end face of a second step of the first-stage piston (6), and when the volume of the third oil chamber (9) is minimum, the third liquid flow channel (8) is communicated with the third oil chamber (9) through the first outer annular oil groove (27) and the second oil inlet groove (26);
and a third oil inlet groove (23) is formed in the end face of a third step of the first-stage piston (6), and the fourth liquid flow channel (11) is communicated with the fourth oil chamber (10) through the second outer annular oil groove (25), the radial oil hole (24) and the third oil inlet groove (23) when the volume of the fourth oil chamber (10) is minimum.
4. A downhole flow control valve according to claim 1 or 2, wherein:
the external diameter of the lower part of second level piston (12) is less than the external diameter on upper portion, form the step between the upper portion of second level piston (12) and the lower part, enclose into oil return cavity (13) between the terminal surface of step, the periphery wall of the lower part of second level piston (12), the internal perisporium of going up valve body (1), the internal perisporium of lower valve body (15), the up end of throttle valve cover (16), be full of hydraulic oil in oil return cavity (13) set up on the valve wall of last valve body (1) with fifth flow channel (14) of oil return cavity (13) intercommunication, fifth flow channel (14) and a hydraulic pressure pipeline intercommunication.
5. A downhole flow control valve according to claim 1, wherein:
rectifying port (17) include that axial interval sets up a plurality of rectification hole groups (171) on the lateral wall of throttle valve cover (16), each rectification hole group (171) include the edge a plurality of radial rectifying holes (1711) that the circumference interval of throttle valve cover (16) was laid.
6. A downhole flow control valve according to claim 5, wherein:
the flow regulating port (17) comprises four groups of flow regulating hole groups (171) which are axially arranged on the side wall of the throttle valve sleeve (16) at intervals.
7. A downhole flow control valve according to claim 1, wherein: and a mechanical driving groove (22) matched with the mechanical claw is formed in the inner peripheral wall of the second-stage piston (12).
8. A downhole flow control valve according to claim 1, wherein: the valve further comprises a sealing valve seat (19), wherein the sealing valve seat (19) is fixedly arranged in the lower valve body (15) and is in close contact with the lower end face of the throttle valve sleeve (16).
9. A downhole flow control valve according to claim 1, wherein: go up and adopt pin (21) fixed connection between valve body (1) and the lower valve body (15), through pin (20) fixed connection between lower valve body (15) and throttle valve cover (16), adopt pin or screw (31) fixed connection between going up valve body (1) and first order hydraulic cylinder inner tube (2).
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| CN202010047360.2A CN111042765B (en) | 2020-01-16 | 2020-01-16 | Underground flow control valve |
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|---|---|---|---|
| CN202010047360.2A CN111042765B (en) | 2020-01-16 | 2020-01-16 | Underground flow control valve |
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| CN111042765B CN111042765B (en) | 2021-11-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112610185A (en) * | 2020-12-16 | 2021-04-06 | 中国石油大学(华东) | Underground multi-stage flow control system, method and application |
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