CN109025934B - Reversible steam injection valve - Google Patents
Reversible steam injection valve Download PDFInfo
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- CN109025934B CN109025934B CN201810926520.3A CN201810926520A CN109025934B CN 109025934 B CN109025934 B CN 109025934B CN 201810926520 A CN201810926520 A CN 201810926520A CN 109025934 B CN109025934 B CN 109025934B
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- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 276
- 230000002441 reversible effect Effects 0.000 title claims abstract description 41
- 230000000903 blocking effect Effects 0.000 claims abstract description 65
- 238000007789 sealing Methods 0.000 claims description 34
- 238000010008 shearing Methods 0.000 claims description 21
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000003129 oil well Substances 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 239000010779 crude oil Substances 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 81
- 239000010410 layer Substances 0.000 description 69
- 238000000605 extraction Methods 0.000 description 12
- 238000002347 injection Methods 0.000 description 12
- 239000007924 injection Substances 0.000 description 12
- 230000009471 action Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003466 welding Methods 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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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
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/04—Ball valves
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Lift Valve (AREA)
- Control Of Turbines (AREA)
Abstract
The invention provides a reversible steam injection valve, which at least comprises a valve body and an on-off component, wherein the valve body is provided with a steam injection channel which is axially communicated, the outer part of the valve body is hermetically sleeved with an outer sleeve, an annular space is formed between the outer sleeve and the valve body, the side wall of the valve body is provided with a steam inlet, a steam injection pipe, a stopping part and a steam exhaust port, the on-off component comprises a first on-off part and a second on-off part, and the first on-off part is provided with a first working position for plugging the steam injection pipe and a second working position for abutting against the stopping part and blocking the steam injection channel; the second on-off part is provided with a first steam injection port and a second steam injection port, the second on-off part is provided with a first steam injection position for plugging the steam inlet and a second steam injection position for abutting against the first on-off part, and the first steam injection port is communicated with the steam inlet and the second steam injection port is communicated with the steam injection pipe under the condition that the second on-off part is positioned at the second steam injection position. The invention can reach the designed steam injection amount without influencing the production time rate of the oil well and the crude oil yield of the oil well.
Description
Technical Field
The invention relates to the technical field of thermal recovery steam distribution in oil extraction engineering, in particular to a reversible steam injection valve.
Background
In the thick oil steam huff and puff development, the imbalance of longitudinal movement is caused due to the difference of oil layer permeability, so that the steam needs to be distributed and injected in layers according to the geological characteristics of each layer. For the huff-and-puff well, the earlier the timing of the steam injection in layers is, the better the equalization degree of the oil layer utilization is. However, some wells are too high in pressure, the steam injection cannot be performed in the middle of single-layer steam injection, and the designed steam injection amount cannot be completed, so that the normal use and operation of the heat injection boiler and the yield of crude oil are influenced.
Disclosure of Invention
The invention aims to provide a reversible steam injection valve which can ensure the normal operation of a heat injection boiler and the yield of crude oil.
In order to achieve the above object, the present invention provides a reversible steam injection valve, which at least comprises:
the valve body is provided with an axially-through steam injection channel, an outer sleeve is sleeved outside the valve body in a sealing manner, an annular space is formed between the outer sleeve and the valve body, a steam inlet, a steam injection pipe, a stopping part and a steam outlet are sequentially arranged on the side wall of the valve body from top to bottom, the steam inlet and the steam outlet are communicated with the annular space, the stopping part is positioned in the steam injection channel, the first end of the steam injection pipe is communicated with the steam injection channel, and the second end of the steam injection pipe extends to the outside of the outer sleeve along the radial direction of the valve body;
the on-off assembly comprises a first on-off part and a second on-off part, wherein the first on-off part and the second on-off part are arranged in the valve body from bottom to top and can move along the axial direction of the valve body in a sealing mode, the first on-off part is provided with a first working position and a second working position, the first working position is used for communicating the steam injection channel and blocking the steam injection pipe, the second working position is abutted against the stopping part, the steam injection channel is blocked by the first on-off part in the state that the first on-off part is located at the second working position, and the steam injection pipe is communicated with the steam injection channel; the steam injection device is characterized in that a first steam injection port and a second steam injection port are arranged on the second on-off part, the second on-off part is provided with a first steam injection position which is communicated with the steam injection channel and blocks the steam inlet and a second steam injection position which is abutted against the first on-off part, the first steam injection port is communicated with the steam inlet in the state that the second on-off part is located at the second steam injection position, and the second steam injection port is communicated with the steam injection pipe.
The reversible steam injection valve comprises a first switching member, a second switching member and a second switching member, wherein the first switching member comprises a first inner sleeve and a first blocking ball, the first inner sleeve is connected with the valve body at the first working position through a first shearing pin, the outer peripheral surface of the first inner sleeve is in sealing fit with the inner surface of the valve body, the first inner sleeve is provided with a first axial through hole communicated with the steam injection channel, the first blocking ball can be in sealing connection with the first axial through hole, and the first inner sleeve can shear the first shearing pin and move from the first working position to the second working position through the sealing connection of the first blocking ball and the first axial through hole;
the second on-off piece comprises a second inner sleeve and a second blocking ball, the second inner sleeve is connected with the valve body through a second shearing pin at the first steam injection position, the outer peripheral surface of the second inner sleeve is in sealing fit with the inner surface of the valve body, the second inner sleeve is provided with a second axial through hole communicated with the steam injection channel, the first blocking ball can penetrate through the second axial through hole, the second blocking ball can be in sealing connection with the second axial through hole, the first steam injection port and the second steam injection port are formed in the side wall of the second inner sleeve, the second blocking ball is in sealing connection with the second axial through hole, and the second shearing pin can be sheared by the second inner sleeve and moves from the first steam injection position to the second steam injection position.
The reversible steam injection valve is characterized in that the first axial through hole is in a reducing shape which is gradually reduced from top to bottom, and the inner diameter of the bottom end of the first axial through hole is smaller than the diameter of the first blocking ball.
The reversible steam injection valve as described above, wherein the lower end surface of the second axial through hole is formed by a baffle ring having a central hole, which is formed by shrinking inward in the circumferential direction, the central hole of the baffle ring has a diameter smaller than the diameter of the second plugging ball, and the central hole of the baffle ring has a diameter larger than the diameter of the first plugging ball.
The above-mentioned reversible steam injection valve, wherein the stopping portion is an annular boss disposed on an inner wall surface of the valve body, and an inner diameter of the annular boss is smaller than an outer diameter of the first inner sleeve.
The reversible steam injection valve is characterized in that the steam injection channel is a stepped hole with a large upper part and a small lower part, the inner diameter of the lower part of the steam injection channel is smaller than the outer diameter of the first inner sleeve, and the stopping part is formed on the stepped surface of the steam injection channel.
The reversible steam injection valve is characterized in that a plurality of steam inlets are formed in the upper portion of the side wall of the valve body at intervals along the circumferential direction, the number of the first steam injection ports is equal to that of the steam inlets, and a plurality of steam exhaust ports are formed in the lower portion of the side wall of the valve body at intervals along the circumferential direction.
The reversible steam injection valve is characterized in that a plurality of steam injection pipes are arranged at intervals along the circumferential direction of the valve body, and the number of the second steam injection ports is the same as that of the steam injection pipes.
The reversible steam injection valve as described above, wherein both ends of the outer sleeve are welded to the valve body.
The reversible steam injection valve further comprises an upper joint, wherein the lower part of the upper joint is provided with an external thread, the upper part of the valve body is provided with an internal thread, and the valve body is connected with the upper joint through the screwing matching of the external thread and the internal thread.
Compared with the prior art, the invention has the following advantages:
the reversible steam injection valve provided by the invention realizes independent steam injection to the lower oil layer, independent steam injection to the upper oil layer or simultaneous steam injection to the upper oil layer and the lower oil layer by changing the positions of the first on-off piece and the second on-off piece without increasing the operation cost and the operation difficulty, and when the pressure of the upper oil layer is higher and the steam injection is difficult, the positions of the first on-off piece and the second on-off piece are changed to enable the upper oil layer and the lower oil layer to inject steam together, so that the steam injection amount is designed without influencing the production time rate of an oil well and the crude oil yield of the oil well.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1 is a schematic structural view of a reversible steam injection valve according to the present invention in a use state;
fig. 2 is another structure diagram of the reversible steam injection valve of the present invention in use.
The reference numbers illustrate:
1. a valve body; 11. a steam injection channel; 12. a steam inlet; 13. a steam injection pipe; 14. a stopper portion; 15. a steam exhaust port; 2. a jacket; 3. an annulus; 4. a first on-off member; 41. a first inner sleeve; 411. a first axial through hole; 42. a first blocking ball; 43. a first shear pin; 5. a second on-off member; 51. a second inner sleeve; 511. a second axial through hole; 5111. a baffle ring; 512. a first steam injection port; 513. a second steam injection port; 52. a second plugging ball; 53. a second shear pin; 6. an upper joint; 71. a first seal ring; 72. and a second seal ring.
Detailed Description
In order to clearly understand the technical solution, the purpose and the effect of the present invention, a detailed description of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the present invention provides a reversible steam injection valve, which is mainly applied to the measure of oil wells for injecting steam in upper and lower layers, and the reversible steam injection valve at least comprises a valve body 1 and an on-off component, wherein:
the valve body 1 is provided with an axially through steam injection channel 11, the steam injection channel 11 forms a first injection channel for injecting steam into a lower oil layer, the outer part of the valve body 1 is hermetically sleeved with an outer sleeve 2, an annular space 3 is formed between the outer sleeve 2 and the valve body 1, the side wall of the valve body 1 is sequentially provided with a steam inlet 12, a steam injection pipe 13, a stopping part 14 and a steam outlet 15 from top to bottom, the steam inlet 12 and the steam outlet 15 are communicated with the annular space 3, namely the steam inlet 12, the annular space 3 and the steam outlet 15 are sequentially communicated to form a second injection channel for injecting steam into the lower oil layer, the upper end and the lower end of the second injection channel are respectively communicated with the upper part and the lower part of the first injection channel, the stopping part 14 is positioned in the steam injection channel 11, the first end of the steam injection pipe 13 is communicated with the steam injection channel 11, the second end of the steam injection pipe 13 extends to the outer part of the outer sleeve 2 along the radial direction of the valve body 1, namely the steam injection pipe 13, steam in the first injection channel can flow into the upper oil layer through the third injection channel;
the on-off assembly comprises a first on-off part 4 and a second on-off part 5 which are arranged in the valve body 1 from bottom to top and can move along the axial direction of the valve body 1 in a sealing manner, the first on-off part 4 is provided with a first working position for communicating the steam injection channel 11 and blocking the steam injection pipe 13 and a second working position for abutting against the stopping part 14, the first on-off part 4 blocks the steam injection channel 11 in the state that the first on-off part 4 is located at the second working position, and the steam injection pipe 13 is communicated with the steam injection channel 11; the second on-off part 5 is provided with a first steam injection port 512 and a second steam injection port 513, the second on-off part 5 is provided with a first steam injection position for communicating the steam injection channel 11 and blocking the steam inlet 12 and a second steam injection position for abutting against the first on-off part 4, the first steam injection port 512 is communicated with the steam inlet 12 under the condition that the second on-off part 5 is positioned at the second steam injection position, the second steam injection port 513 is communicated with the steam injection pipe 13, and the steam can be injected to the lower oil layer independently, the upper oil layer independently or the upper oil layer and the lower oil layer simultaneously by changing the positions of the first on-off part 4 and the second on-off part 5;
specifically, when in use, after the reversible steam injection valve is lowered to a target position along with a pipe column, at this time, the lower end of the steam injection channel 11 is communicated with a lower oil layer, the second end of the steam injection pipe 13 is communicated with an upper oil layer, the first on-off part 4 is positioned at a first working position, the second on-off part 5 is positioned at a first steam injection position, because the first on-off part 4 blocks the steam injection pipe 13, and the second on-off part 5 blocks the steam inlet 12, steam injected into the steam injection channel 11 can only enter the lower oil layer for oil extraction through the lower end of the steam injection channel 11, when the lower oil layer is injected with a designed steam quantity, the first on-off part 4 is controlled to move to the second working position, at this time, the first on-off part 4 is abutted against the stop part 14 and blocks the steam injection channel 11, so that steam injected into the steam injection channel 11 can not enter the lower oil layer, and the movement of the first on-off part 4 opens the steam injection pipe 13, the steam injection pipe 13 is communicated with the steam injection channel 11, steam injected into the steam injection channel 11 can only enter an upper oil layer through the steam injection pipe 13 for oil extraction, and steam injection and well stewing are stopped after the steam injection with the designed amount is finished; when the pressure of the upper oil layer is large and difficult to inject, in order to ensure the yield of the oil well, the second break-make member 5 is controlled to move to the second steam injection position, at this time, the second break-make member 5 abuts against the first break-make member 4, the first steam injection port 512 is communicated with the steam inlet 12, the second steam injection port 513 is communicated with the steam injection pipe 13, and the first break-make member 4 is still in the second working position, so that the injection channel is still blocked, therefore, a part of steam injected into the steam injection channel 11 can enter the annular space 3 through the first steam injection port 512 and the steam inlet 12, and enters the lower oil layer through the annular space 3, the steam exhaust port 15 and the bottom of the steam injection channel 11 for oil extraction, and the other part of steam can enter the upper oil layer for oil extraction through the second steam injection port 513 and the steam injection pipe 13.
The reversible steam injection valve provided by the invention realizes independent steam injection to a lower oil layer, independent steam injection to an upper oil layer or simultaneous steam injection to the upper oil layer and the lower oil layer by changing the positions of the first on-off piece 4 and the second on-off piece 5 without increasing the operation cost and the operation difficulty, and when the pressure of the upper oil layer is higher and the steam injection is difficult, the positions of the first on-off piece 4 and the second on-off piece 5 are changed to simultaneously inject the steam into the upper oil layer and the lower oil layer, so that the designed steam injection amount is achieved without influencing the production time rate of an oil well and the crude oil yield of the oil well.
In a preferred embodiment of the present invention, as shown in fig. 2, the first cut-off member 4 comprises a first inner sleeve 41 and a first blocking ball 42, the first inner sleeve 41 is connected to the valve body 1 through a first shear pin 43 at a first working position, and the outer circumferential surface of the first inner sleeve 41 is in sealing engagement with the inner surface of the valve body 1, preferably, a first sealing ring 71 is provided between the outer circumferential surface of the first inner sleeve 41 and the inner surface of the valve body 1, the first inner sleeve 41 has a first axial through hole 411 communicated with the steam injection channel 11, the first blocking ball 42 can be in sealing engagement with the first axial through hole 411, the first inner sleeve 41 can shear the first shear pin 43 to move from the first working position to a second working position through the sealing engagement of the first blocking ball 42 with the first axial through hole 411, specifically, the first inner sleeve 41 is limited at the first working position through the first shear pin 43, after the designed amount of steam is injected into the lower oil layer, a first blocking ball 42 is put into the first axial through hole 411, the first blocking ball 42 is connected with the first axial through hole 411 in a sealing manner, namely the first blocking ball 42 blocks the first axial through hole 411, and because the outer circumferential surface of the first inner sleeve 41 is matched with the inner surface of the valve body 1 in a sealing manner, the first inner sleeve 41 and the first blocking ball 42 block the steam injection channel 11, at the moment, the pressure in the steam injection channel 11 positioned at the upper part of the first inner sleeve 41 is increased continuously due to the continuous injection of the steam into the steam injection channel 11, when the pressure is increased to the shearing pressure of the first shearing pin 43, the first shearing pin 43 is sheared, the first inner sleeve 41 containing the first blocking ball 42 moves downwards to be abutted against the stopping part 14 under the action of the steam pressure, namely, the first on-off part 4 moves from the first working position to the second working position, at the moment, the steam injection pipe 13 is communicated with the steam injection channel 11, and steam can only enter an upper oil layer through the steam injection pipe 13 for oil extraction because the steam injection channel 11 is blocked by the first on-off piece 4 and steam cannot be injected into a lower layer, so that layered oil extraction is realized;
the second shut-off member 5 includes a second inner sleeve 51 and a second blocking ball 52, the second inner sleeve 51 is connected with the valve body 1 at the first steam injection position through a second shear pin 53, and the outer circumferential surface of the second inner sleeve 51 is in sealing fit with the inner surface of the valve body 1, preferably, a second sealing ring 72 is provided between the outer circumferential surface of the second inner sleeve 51 and the inner surface of the valve body 1, the second inner sleeve 51 has a second axial through hole 511 communicating with the steam injection passage 11, the first blocking ball 42 can pass through the second axial through hole 511, the second blocking ball 52 can be in sealing connection with the second axial through hole 511, the first steam injection port 512 and the second steam injection port 513 are provided on the sidewall of the second inner sleeve 51, the second inner sleeve 51 can shear the second shear pin 53 to move from the first steam injection position to the second steam injection position through the sealing connection of the second blocking ball 52 and the second axial through hole 511, specifically, when the injection of the upper pressure is difficult, in order to ensure the production of the oil well, a second blocking ball 52 is put into the second axial through hole 511, the second blocking ball 52 is connected with the second axial through hole 511 in a sealing way, namely the second blocking ball 52 blocks the second axial through hole 511, the outer circumferential surface of the second inner sleeve 51 is matched with the inner surface of the valve body 1 in a sealing way, so that the second inner sleeve 51 and the second blocking ball 52 also block the steam injection channel 11, steam can not pass through the second cut-off member 5, at the moment, the pressure in the steam injection channel 11 positioned at the upper part of the second inner sleeve 51 is increased because the steam is injected into the steam injection channel 11 continuously, when the pressure is increased to the shearing pressure of the second shearing pin 53, the second shearing pin 53 is sheared, the second inner sleeve 51 containing the second blocking ball 52 moves downwards to be abutted to the first inner sleeve 41 under the action of the steam pressure, namely, the second cut-off member 5 moves from the first steam injection position to the second steam injection position, at this time, the steam injection passage 11 is simultaneously blocked by the first on-off member 4 and the second on-off member 5, and in the state that the second on-off member 5 is located at the second steam injection position, the first steam injection port 512 is communicated with the steam inlet 12, and the second steam injection port 513 is communicated with the steam injection pipe 13, so that a part of steam injected into the steam injection passage 11 enters the annular space 3 through the first steam injection port 512 and the steam inlet 12, enters the lower oil layer through the annular space 3, the steam exhaust port 15 and the bottom of the steam injection passage 11 for oil extraction, and the other part of steam enters the upper oil layer through the second steam injection port 513 and the steam injection pipe 13 for oil extraction, thereby realizing that the upper and lower oil layers are injected with steam for oil extraction together, and achieving the purpose of designing steam injection amount without affecting the production time rate and the crude oil yield of the oil well.
Certainly, the first on-off member 4 and the second on-off member 5 may also adopt ball valves, the valve body 1 of the second on-off member 5 is provided with a first steam injection port 512 and a second steam injection port 513, the ball valves may be connected with the valve body 1 through shear pins, or may be connected with the valve body 1 through electromagnets, the connection or blocking of the first on-off member 4 and the second on-off member 5 with the steam injection passage 11 is realized by controlling the on-off of the ball valves, the shear pins are cut through steam pressure or overcome magnetic force to push the first on-off member 4 and the second on-off member 5 to move, and the separate steam injection to the upper oil layer or the simultaneous steam injection to the upper oil layer and the lower oil layer is realized.
Further, first axial perforating hole 411 is the reducing form of convergent from top to bottom, and the bottom internal diameter of first axial perforating hole 411 is less than the diameter of first shutoff ball 42 for after throwing into first shutoff ball 42, first shutoff ball 42 can realize closely laminating with first axial perforating hole 411 under the effect of vapor pressure, thereby effectively block the notes vapour passageway.
Further, the lower end surface of the second axial through hole 511 is contracted inwards along the circumferential direction to form a blocking ring 5111 with a central hole, the diameter of the central hole of the blocking ring 5111 is smaller than that of the second blocking ball 52, and the diameter of the central hole of the blocking ring 5111 is larger than that of the first blocking ball 42, the first blocking ball 42 can penetrate through the blocking ring 5111 to enter the first axial through hole 411 of the first inner sleeve 41, the second blocking ball 52 is blocked by the blocking ring 5111 to block the second axial through hole 511, so that a steam channel is further blocked, and steam above the second breaking member 5 can only be injected into an upper oil layer and a lower oil layer through the annular space 3 and the steam injection pipe 13 respectively through the first steam injection port 512 and the second steam injection port 513 after the second shearing pin 53 is cut off to enable the second breaking member 5 to move to the second steam injection position for oil extraction.
It should be noted that, the lower end surface of the first axial through hole 411 may also be made to contract inward along the circumferential direction to form a retaining ring 5111 with a central hole, the central hole diameter of the retaining ring 5111 is smaller than the diameter of the first blocking ball 42, the second axial through hole 511 is in a reducing shape that is tapered from top to bottom, the bottom inner diameter of the first axial through hole 411 is smaller than the diameter of the second blocking ball 52, and the bottom inner diameter of the first axial through hole 411 is larger than the diameter of the first blocking ball 42, so that the first blocking ball 42 can pass through the second axial through hole 511 to enter the first axial through hole 411.
In a specific implementation manner of the embodiment, as shown in fig. 1, the stopping portion 14 is an annular boss disposed on an inner wall surface of the valve body 1, and an inner diameter of the annular boss is smaller than an outer diameter of the first inner sleeve 41, so that when the first inner sleeve 41 moves downward under the action of steam pressure, the first inner sleeve 41 is limited by the annular boss and cannot move continuously, and the first inner sleeve 41 is prevented from blocking the steam exhaust port 15, thereby ensuring that the reversible steam injection valve can simultaneously inject steam to the upper and lower oil layers simultaneously.
In another specific implementation manner of the embodiment, the steam injection channel 11 is a stepped hole with a large top and a small bottom, the inner diameter of the lower portion of the steam injection channel 11 is smaller than the outer diameter of the first inner sleeve 41, and the stepped surface of the steam injection channel 11 forms the stopping portion 14, so that when the first inner sleeve 41 moves downward under the action of steam pressure, the first inner sleeve 41 is limited by the stepped surface and cannot move continuously, the first inner sleeve 41 can be prevented from blocking the steam outlet 15, and the reversible steam injection valve is ensured to simultaneously inject steam to the upper and lower oil layers.
In a specific embodiment of the embodiment, as shown in fig. 1, in order to enable steam to uniformly enter the annular space 3, a plurality of steam inlets 12 are circumferentially provided at intervals on the upper portion of the side wall of the valve body 1, preferably, the plurality of steam inlets 12 are equally spaced, the number of the first steam injection ports 512 is the same as the number of the steam inlets 12, so that after the second inner sleeve 51 moves, each steam inlet 12 can be communicated with the steam injection channel 11 through the first steam injection port 512 communicated therewith, so that steam can uniformly enter the annular space 3, in order to enable steam in the annular space 3 to be discharged as quickly as possible, a plurality of steam discharge ports 15 are circumferentially provided at intervals on the lower portion of the side wall of the valve body 1, and steam in the annular space 3 is rapidly discharged through the plurality of steam discharge ports 15, preferably, the number of the steam discharge ports 15 is the same as the number of the steam inlets 12.
In a specific implementation manner of the embodiment, in order to improve the efficiency of independently injecting steam into the upper oil layer, a plurality of steam injection pipes 13 are arranged at intervals along the circumferential direction of the valve body 1, preferably, the plurality of steam injection pipes 13 are arranged at equal intervals, and the number of the second steam injection ports 513 is the same as that of the steam injection pipes 13, so that after the second inner sleeve 51 moves, each steam injection pipe 13 can uniformly inject steam into the upper oil layer through the second steam injection port 513 to produce oil, thereby improving the oil production efficiency.
In one embodiment of the invention, two ends of the outer sleeve 2 are welded on the valve body 1, the welding mode is simple and reliable, and the sealing performance of the annular space 3 can be effectively ensured.
In one embodiment of the present invention, the reversible steam injection valve further comprises an upper joint 6, the lower part of the upper joint 6 is provided with an external thread, the upper part of the valve body 1 is provided with an internal thread, the valve body 1 is connected with the upper joint 6 through the screwing matching of the external thread and the internal thread, the valve body 1 can be connected with other parts through the upper joint 6, and the inner wall of the upper joint 6 protrudes out of the inner surface of the valve body 1, so that the upper joint 6 can play a role in limiting the upward movement of the first on-off member 4 and the second on-off member 5, and the first on-off member 4 and the second on-off member 5 are prevented from falling off when the reversible steam injection valve is lifted.
The working process of the reversible steam injection valve of the invention is described in detail below with reference to the accompanying drawings:
as shown in fig. 1 and 2, the reversible steam injection valve is connected with the pipe column through the upper joint 6, and is lowered into the upper and lower steam injection wells through the pipe column, the lower end of the steam injection channel 11 is communicated with the lower oil layer, the second end of the steam injection pipe 13 is communicated with the upper oil layer, the first inner sleeve 41 is located at the first working position, the second inner sleeve 51 is located at the first steam injection position, because the first inner sleeve 41 blocks the steam injection pipe 13 and the second inner sleeve 51 blocks the steam inlet 12, the steam injected into the steam injection channel 11 can only enter the lower oil layer for oil production through the lower end of the steam injection channel 11, when the lower oil layer is injected with the designed steam amount, the first blocking ball 42 is put into the first axial through hole 411 of the first inner sleeve 41, the first blocking ball 42 is connected with the first axial through hole 411 in a sealing manner, namely, the first blocking ball 42 blocks the first axial through hole 411, and because the outer peripheral surface of the first inner sleeve 41 is in sealing fit with the inner surface of the valve body 1, the first inner sleeve 41 and the first blocking ball 42 block the steam injection channel 11, at this time, as steam is injected into the steam injection channel 11 continuously, the pressure in the steam injection channel 11 positioned at the upper part of the first inner sleeve 41 is increased continuously, when the pressure is increased to the shearing pressure of the first shearing pin 43, the first shearing pin 43 is sheared, the first inner sleeve 41 containing the first blocking ball 42 moves downwards under the action of steam pressure to be abutted against the annular boss, namely, the first on-off member 4 moves from the first working position to the second working position, at this time, the steam injection pipe 13 is communicated with the steam injection channel 11, and as the steam injection channel 11 is blocked by the first on-off member 4, steam cannot be injected to the lower layer normally, and steam can only enter the upper oil layer through the steam injection pipe 13 for oil extraction;
when the pressure of the upper oil layer is difficult to inject, in order to ensure the oil well yield, a second blocking ball 52 is put into the second axial through hole 511 of the second inner sleeve 51, the second blocking ball 52 is connected with the second axial through hole 511 in a sealing manner, that is, the second blocking ball 52 blocks the second axial through hole 511, the outer peripheral surface of the second inner sleeve 51 is in sealing engagement with the inner surface of the valve body 1, so that the second inner sleeve 51 and the second blocking ball 52 also block the steam injection passage 11, steam cannot pass through the second blocking member 5, at this time, the pressure in the steam injection passage 11 positioned above the second inner sleeve 51 is increased continuously due to the continuous injection of steam into the steam injection passage 11, when the pressure is increased to the shearing pressure of the second shearing pin 53, the second shearing pin 53 is sheared, and the second inner sleeve 51 containing the second blocking ball 52 moves downward to abut against the first inner sleeve 41 under the action of steam pressure, that is, the second cut-off member 5 moves from the first steam injection position to the second steam injection position, at this time, the steam injection passage 11 is simultaneously blocked by the first cut-off member 4 and the second cut-off member 5 and cannot inject steam directly to the lower layer, and in the state that the second cut-off member 5 is located at the second steam injection position, the first steam injection port 512 is communicated with the steam inlet 12, and the second steam injection port 513 is communicated with the steam injection pipe 13, so that a part of steam injected into the steam injection passage 11 enters the annular space 3 through the first steam injection port 512 and the steam inlet 12, enters the lower oil layer through the annular space 3, the steam exhaust port 15 and the bottom of the steam injection passage 11 for oil production, and the other part of steam enters the upper oil layer through the second steam injection port 513 and the steam injection pipe 13 for oil production, thereby realizing oil production by injecting steam into the upper and lower oil layers together.
In summary, the reversible steam injection valve provided by the invention realizes independent steam injection to the lower oil layer, independent steam injection to the upper oil layer or simultaneous steam injection to the upper oil layer and the lower oil layer by changing the positions of the first on-off piece and the second on-off piece without increasing the operation cost and the operation difficulty, and when the pressure of the upper oil layer is higher and the steam injection is difficult, the positions of the first on-off piece and the second on-off piece are changed to simultaneously inject the steam into the upper oil layer and the lower oil layer, so that the designed steam injection amount is achieved without influencing the production time rate of an oil well and the crude oil yield of the oil well.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention. It should be noted that the components of the present invention are not limited to the above-mentioned whole application, and various technical features described in the present specification can be selected to be used alone or in combination according to actual needs, so that the present invention naturally covers other combinations and specific applications related to the invention.
Claims (10)
1. A reversible steam injection valve, comprising at least:
the valve body is provided with an axially-through steam injection channel, an outer sleeve is sleeved outside the valve body in a sealing manner, an annular space is formed between the outer sleeve and the valve body, a steam inlet, a steam injection pipe, a stopping part and a steam outlet are sequentially arranged on the side wall of the valve body from top to bottom, the steam inlet and the steam outlet are communicated with the annular space, the stopping part is positioned in the steam injection channel, the first end of the steam injection pipe is communicated with the steam injection channel, and the second end of the steam injection pipe extends to the outside of the outer sleeve along the radial direction of the valve body;
the on-off assembly comprises a first on-off part and a second on-off part, wherein the first on-off part and the second on-off part are arranged in the valve body from bottom to top and can move along the axial direction of the valve body in a sealing mode, the first on-off part is provided with a first working position and a second working position, the first working position is used for communicating the steam injection channel and blocking the steam injection pipe, the second working position is abutted against the stopping part, the steam injection channel is blocked by the first on-off part in the state that the first on-off part is located at the second working position, and the steam injection pipe is communicated with the steam injection channel; the steam injection valve is characterized in that a first steam injection port and a second steam injection port are arranged on the second on-off piece, the second on-off piece is provided with a first steam injection position which is communicated with the steam injection channel and used for plugging the steam inlet and a second steam injection position which is abutted against the first on-off piece, the first steam injection port is communicated with the steam inlet in the state that the second on-off piece is located at the second steam injection position, the second steam injection port is communicated with the steam injection pipe, and the reversible steam injection valve can realize independent steam injection to a lower oil layer, independent steam injection to an upper oil layer or simultaneous steam injection to the upper oil layer and the lower oil layer by changing the positions of the first on-off piece and the second on-off piece.
2. The reversible steam injection valve according to claim 1,
the first on-off member comprises a first inner sleeve and a first blocking ball, the first inner sleeve is connected with the valve body at the first working position through a first shearing pin, the outer peripheral surface of the first inner sleeve is in sealing fit with the inner surface of the valve body, the first inner sleeve is provided with a first axial through hole communicated with the steam injection channel, the first blocking ball can be in sealing connection with the first axial through hole, and the first inner sleeve can shear the first shearing pin and move from the first working position to the second working position through the sealing connection of the first blocking ball and the first axial through hole;
the second on-off piece comprises a second inner sleeve and a second blocking ball, the second inner sleeve is connected with the valve body through a second shearing pin at the first steam injection position, the outer peripheral surface of the second inner sleeve is in sealing fit with the inner surface of the valve body, the second inner sleeve is provided with a second axial through hole communicated with the steam injection channel, the first blocking ball can penetrate through the second axial through hole, the second blocking ball can be in sealing connection with the second axial through hole, the first steam injection port and the second steam injection port are formed in the side wall of the second inner sleeve, the second blocking ball is in sealing connection with the second axial through hole, and the second shearing pin can be sheared by the second inner sleeve and moves from the first steam injection position to the second steam injection position.
3. The reversible steam injection valve according to claim 2,
the first axial through hole is in a reducing shape gradually reduced from top to bottom, and the inner diameter of the bottom end of the first axial through hole is smaller than the diameter of the first plugging ball.
4. The reversible steam injection valve according to claim 2,
the lower end face of the second axial through hole is inwards shrunk along the circumferential direction to form a retaining ring with a central hole, the diameter of the central hole of the retaining ring is smaller than that of the second plugging ball, and the diameter of the central hole of the retaining ring is larger than that of the first plugging ball.
5. The reversible steam injection valve according to claim 2,
the stopping part is an annular boss arranged on the inner wall surface of the valve body, and the inner diameter of the annular boss is smaller than the outer diameter of the first inner sleeve.
6. The reversible steam injection valve according to claim 2,
the steam injection channel is a stepped hole with a large upper part and a small lower part, the inner diameter of the lower part of the steam injection channel is smaller than the outer diameter of the first inner sleeve, and the stopping part is formed on the stepped surface of the steam injection channel.
7. The reversible steam injection valve according to claim 2,
the upper portion of the side wall of the valve body is provided with a plurality of steam inlets at intervals along the circumferential direction, the number of the first steam injection ports is equal to that of the steam inlets, and the lower portion of the side wall of the valve body is provided with a plurality of steam discharge ports at intervals along the circumferential direction.
8. The reversible steam injection valve according to claim 2,
a plurality of steam injection pipes are arranged at intervals along the circumferential direction of the valve body, and the number of the second steam injection ports is the same as that of the steam injection pipes.
9. The reversible steam injection valve according to any one of claims 1 to 8,
the two ends of the outer sleeve are welded on the valve body.
10. The reversible steam injection valve according to any one of claims 1 to 8,
the reversible steam injection valve further comprises an upper joint, the lower portion of the upper joint is provided with an external thread, the upper portion of the valve body is provided with an internal thread, the external thread is matched with the internal thread in a screwing mode, and the valve body is connected with the upper joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810926520.3A CN109025934B (en) | 2018-08-15 | 2018-08-15 | Reversible steam injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810926520.3A CN109025934B (en) | 2018-08-15 | 2018-08-15 | Reversible steam injection valve |
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| Publication Number | Publication Date |
|---|---|
| CN109025934A CN109025934A (en) | 2018-12-18 |
| CN109025934B true CN109025934B (en) | 2020-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810926520.3A Active CN109025934B (en) | 2018-08-15 | 2018-08-15 | Reversible steam injection valve |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111980648B (en) * | 2019-05-22 | 2022-06-03 | 中国石油天然气股份有限公司 | Multistage time-delay steam injection pipe column |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103244091B (en) * | 2013-04-23 | 2015-07-08 | 中国石油天然气股份有限公司 | Reverse steam injection device |
| CN203441435U (en) * | 2013-08-05 | 2014-02-19 | 中国石油天然气股份有限公司 | Steam distribution valve capable of twice ball throwing |
| CN204371279U (en) * | 2014-12-04 | 2015-06-03 | 中国石油天然气股份有限公司 | horizontal well gas injection valve |
| RU2667952C1 (en) * | 2015-05-20 | 2018-09-25 | Халлибертон Энерджи Сервисез, Инк. | Compression bypass valve and method for control thereof (options) |
| US10214993B2 (en) * | 2016-02-09 | 2019-02-26 | Baker Hughes, A Ge Company, Llc | Straddle frac tool with pump through feature apparatus and method |
| CN205805530U (en) * | 2016-06-30 | 2016-12-14 | 中国石油化工股份有限公司 | A kind of layer steam injection regulating separate stratum injection string |
| CN206016768U (en) * | 2016-08-22 | 2017-03-15 | 中国石油天然气股份有限公司 | Double-flow-passage steam injection valve |
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