CN109025933B - Preheating type steam distribution valve - Google Patents

Abstract

The invention provides a preheating type steam distribution valve, which at least comprises a valve body and an on-off assembly, wherein the valve body is provided with a steam injection channel which is axially communicated, the side wall of the valve body is provided with a steam inlet, a first steam injection pipe, a second steam injection pipe, a stopping part and a steam exhaust port, the on-off assembly comprises a first on-off part and a second on-off part, 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, when the first on-off part is positioned at the second working position, the first on-off part blocks the steam injection channel and plugs the second steam injection pipe, and the first steam injection pipe is communicated with the steam injection channel; the second on-off part is provided with a 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 abutting against the first on-off part, when the second on-off part is positioned at the second steam injection position, the second on-off part plugs the first steam injection pipe, and the steam injection port is communicated with the steam inlet. The invention can perform preheating in a general mode and then perform layered steam injection, and is beneficial to the operation of boiler equipment.

Description

Preheating type steam distribution valve

Technical Field

The invention relates to the technical field of thermal recovery steam distribution in oil extraction engineering, in particular to a preheating type steam distribution 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. The existing steam distribution valve can only inject steam layer by layer, namely, steam can only be injected layer by layer, and steam can not be injected into the boiler to be preheated in a general way, so that the initial steam injection pressure is higher, the operation of boiler equipment is not facilitated, and the operation of a steam injection boiler is adversely affected.

Disclosure of Invention

The invention aims to provide a preheating type steam distribution valve which can perform preheating by general injection and then layered steam injection.

In order to achieve the above object, the present invention provides a preheating type steam distribution 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 first steam injection pipe, a second steam injection pipe, a stopping part and a steam exhaust port are sequentially arranged on the side wall of the valve body from top to bottom, the steam inlet and the steam exhaust port are communicated with the annular space, the stopping part is positioned in the steam injection channel, the first end of the first steam injection pipe and one end of the second steam injection pipe are communicated with the steam injection channel, and the second end of the first steam injection pipe and the second end of the second steam injection pipe extend 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 communicated with the steam injection channel and used for plugging the first steam injection pipe, the second working position is abutted against the stopping part, the first on-off part is used for plugging the steam injection channel and used for plugging the second steam injection pipe when the first on-off part is located at the second working position, and the first steam injection pipe is communicated with the steam injection channel; the steam injection device is characterized in that a steam injection port is 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 used for plugging the steam inlet, and a second steam injection position which is abutted against the first on-off part, the second on-off part plugs the first steam injection pipe when the second on-off part is located at the second steam injection position, and the steam injection port is communicated with the steam inlet.

The preheating type steam distribution valve comprises a first switching member, a second switching member and a steam injection passage, 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 a 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 passage, 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 a second working position through the sealing connection of the first blocking ball and the first axial through hole;

the second on-off piece includes second endotheca and second shutoff ball, the second endotheca in first notes vapour position department through second shear pin with the valve body meets, just the outer peripheral face of second endotheca with the internal surface sealing cooperation of valve body, the second endotheca have with annotate the second axial perforating hole of vapour passageway intercommunication, first shutoff ball can pass second axial perforating hole, second shutoff ball can with second axial perforating hole sealing connection, annotate the vapour mouth set up in on the lateral wall of second endotheca, through second shutoff ball with the sealing connection of second axial perforating hole, the second endotheca can be cut second shear pin is by first notes vapour position removal to second notes vapour position.

The preheating steam distribution 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 preheating type steam distribution valve is characterized in that the lower end surface of the second axial through hole is formed into a baffle ring with a central hole in a circumferential direction and in an inward shrinkage mode, the diameter of the central hole of the baffle ring is smaller than that of the second blocking ball, and the diameter of the central hole of the baffle ring is larger than that of the first blocking ball.

The preheating steam distribution valve comprises a stop part, a first inner sleeve and a second inner sleeve, wherein the stop 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.

The preheating steam distribution 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 stepped surface of the steam injection channel forms the stopping part.

The preheating steam distribution valve is characterized in that the upper part 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 steam injection ports is the same as that of the steam inlets, and the lower part of the side wall of the valve body is provided with a plurality of steam discharge ports at intervals along the circumferential direction.

The preheating steam distribution valve comprises a valve body, a first steam injection pipe and a second steam injection pipe, wherein the first steam injection pipe and the second steam injection pipe are arranged in parallel, and the first steam injection pipe and the second steam injection pipe are arranged at intervals along the circumferential direction of the valve body.

The preheating type steam distribution valve is characterized in that the two ends of the outer sleeve are welded on the valve body.

The preheating type steam distribution 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, 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 preheating type steam distribution valve provided by the invention realizes preheating of steam injected into two oil layers in a general way at the initial steam injection stage by changing the positions of the first on-off piece and the second on-off piece, and after the preheating effect is achieved, steam injection is carried out in a layered manner, so that the highest pressure during the initial operation of a boiler is reduced, the operation of the boiler is facilitated, and the operation cost and the operation difficulty are not increased.

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 preheating type steam distribution valve of the present invention in a use state;

fig. 2 is a schematic structural diagram of another using state of the preheating type steam distribution valve.

The reference numbers illustrate:

1. a valve body; 11. a steam injection channel; 12. a steam inlet; 13. a first steam injection pipe; 14. a second steam injection pipe; 15. a stopper portion; 16. 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 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 invention provides a preheating type steam distribution valve, which is mainly applied to an oil well with steam injected from an upper layer and a lower layer, and is suitable for an oil well with higher initial injection pressure and lower later injection pressure of the current oil well, the preheating type steam distribution valve at least comprises a valve body 1 and an on-off component, wherein:

the valve body 1 is provided with a steam injection channel 11 which is axially communicated, 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 first steam injection pipe 13, a second steam injection pipe 14, a stopping part 15 and a steam outlet 16 from top to bottom, the steam inlet 12 and the steam outlet 16 are communicated with the annular space 3, namely the steam inlet 12, the annular space 3 and the steam outlet 16 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 15 is positioned in the steam injection channel 11, the first end of the first steam injection pipe 13 and the first end of the second steam injection pipe 14 are both communicated with the steam injection channel 11, the second end of the first steam injection pipe 13 and the second end of the second steam injection pipe 14 both extend to the outer part of the, that is, the first steam injection pipe 13 and the second steam injection pipe 14 respectively form a third injection passage and a fourth injection passage for injecting steam into the upper oil layer, and the steam in the first injection passage can flow into the upper oil layer through the third injection passage or the fourth injection passage;

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 plugging the first steam injection pipe 13 and a second working position for abutting against the stopping part 15, the first on-off part 4 blocks the steam injection channel 11 and plugs the second steam injection pipe 14 in the state that the first on-off part 4 is located at the second working position, and the first steam injection pipe 13 is communicated with the steam injection channel 11; the second on-off part 5 is provided with a steam injection port 512, 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 second on-off part 5 blocks the first steam injection pipe 13 in the state that the second on-off part 5 is positioned at the second steam injection position, the steam injection port 512 is communicated with the steam inlet 12, and the steam injection to the upper oil layer and the lower oil layer can be simultaneously preheated by changing the positions of the first on-off part 4 and the second on-off part 5, and the steam injection to the lower oil layer and the oil extraction to the upper oil layer can be independently realized or the steam injection to the upper oil layer and the oil extraction can be independently realized;

specifically, when in use, the preheating type steam distribution valve is firstly put into a target layer 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 second steam injection pipe 14 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 first steam injection pipe 13 and the second on-off part 5 blocks the steam inlet 12, a part of steam injected into the steam injection channel 11 enters the lower oil layer through the lower end of the steam injection channel 11, the other part of steam injected into the steam injection channel 11 enters the upper oil layer through the second steam injection pipe 14 and simultaneously preheats the upper oil layer and the lower oil layer, after a preset preheating amount is reached, 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 15 and blocks the steam injection channel 11, so that the steam injected into the steam injection passage 11 cannot enter the lower oil layer, and the movement of the first on-off valve opens the first steam injection pipe 13 and blocks the second steam injection pipe 14, the first steam injection pipe 13 is communicated with the steam injection channel 11, the steam injected into the steam injection channel 11 can only enter the upper oil layer through the second steam injection pipe 14 for oil extraction, when the injection amount reaches the design amount, the second shut-off member 5 is controlled to move to the second steam injection position, and at this time, the second on-off member 5 is abutted against the first on-off member 4 and seals the first steam injection pipe 13, the steam injection port 512 is communicated with the steam inlet 12, and since the first on-off valve is still in the second working position, the injection channel is still blocked, the second steam injection pipe 14 is still blocked, therefore, the steam injected into the steam injection passage 11 can enter the annular space 3 only through the steam injection port 512 and the steam inlet port 12, and enters the lower oil reservoir for oil production through the annular space 3, the steam discharge port 16 and the bottom of the steam injection channel 11.

According to the preheating type steam distribution valve provided by the invention, the preheating of the steam injection of two oil layers in a general way at the initial steam injection stage is realized by changing the positions of the first on-off piece 4 and the second on-off piece 5, and after the preheating effect is achieved, the steam injection is carried out in a layering manner, so that the highest pressure during the initial operation of a boiler is reduced, the operation of the boiler is facilitated, and the operation cost and the operation difficulty are not increased.

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, when the preset preheating amount is reached, the 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 way, namely the first blocking ball 42 blocks the first axial through hole 411, the outer circumferential surface of the first inner sleeve 41 is matched with the inner surface of the valve body 1 in a sealing way, so that the first inner sleeve 41 and the first blocking ball 42 block the steam injection channel 11, at the moment, the steam is continuously injected into the steam injection channel 11, the pressure in the steam injection channel 11 positioned at the upper part of the first inner sleeve 41 is continuously increased, 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 15 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 first steam injection pipe 13 is communicated with the steam injection channel 11, the second steam injection pipe 14 is blocked, and steam cannot be injected into the lower layer due to the fact that the steam injection channel 11 is blocked by the first on-off piece 4, and the steam can only enter the upper oil layer through the second steam injection pipe 14 to be extracted, and layered oil extraction is achieved;

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, a steam injection port 512 is 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 amount of steam injected into the upper oil layer reaches the design amount, the 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, and 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, the steam can not pass through the second cut-off member 5, at this time, the 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 second inner sleeve 51 is increased continuously, when the pressure is increased to the cutting pressure of the second cutting pin 53, the second cutting pin 53 is cut off, the second inner sleeve 51 containing the second blocking ball 52 moves downwards under the effect of the steam pressure to be abutted against the first inner sleeve 41, namely, the second cut-off member 5 moves from the first steam injection position to the second steam injection position, the steam injection channel 11 is simultaneously blocked by the first on-off part 4 and the second on-off part 5, and in the state that the second on-off part 5 is positioned at the second steam injection position, the second on-off part 5 blocks the first steam injection pipe 13, and the steam injection port 512 is communicated with the steam inlet 12, so that the steam injected into the steam injection channel 11 can only enter the annular space 3 through the steam injection port 512 and the steam inlet 12, and enters the lower oil layer for oil production through the annular space 3, the steam exhaust port 16 and the bottom of the steam injection channel 11.

Of course, the first on-off member 4 and the second on-off member 5 may also be ball valves, the valve body 1 of the second on-off member 5 may be provided with the steam injection port 512, the ball valves may be connected to the valve body 1 through shear pins, or may be connected to the valve body 1 through electromagnets, the first on-off member 4 and the second on-off member 5 are connected to the steam injection passage 11 or blocked by controlling the on-off of the ball valves, the pins are cut off by steam pressure or the first on-off member 4 and the second on-off member 5 are pushed to move by overcoming magnetic force, and the steam injection to the upper oil layer alone or the steam injection to the upper and lower oil layers simultaneously 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 face of the second axial through hole 511 is inwardly contracted 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, and 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 a lower oil layer through the annular space 3 through the steam injection port 512 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 15 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, so as to prevent the first inner sleeve 41 from blocking the steam exhaust port 16, thereby ensuring that the preheating type steam distribution 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 bottom 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 15, 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 16, and the preheating type steam distribution 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, and the number of the 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 passage 11 through the steam injection port 512 communicated therewith, so that steam can uniformly enter the annular space 3, and in order to enable steam in the annular space 3 to be discharged as quickly as possible, a plurality of steam outlets 16 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 outlets 16, preferably, the number of the steam outlets 16 is the same as the number of the steam inlets 12.

In a specific implementation manner of the embodiment, the first steam injection pipe 13 and the second steam injection pipe 14 are arranged in parallel to avoid the mutual influence of the first steam injection pipe 13 and the second steam injection pipe 14, in order to improve the efficiency of injecting steam to the upper oil layer separately, a plurality of first steam injection pipes 13 and a plurality of second steam injection pipes 14 are arranged at intervals along the circumferential direction of the valve body 1, preferably, the plurality of first steam injection pipes 13 are arranged at equal intervals, and the plurality of second steam injection pipes 14 are arranged at equal intervals, so that before the first inner sleeve 41 moves, steam can uniformly enter the upper oil layer through the second steam injection pipes 14 to be preheated, and after the first inner sleeve 41 moves, steam can be uniformly injected into the upper oil layer through the first steam injection pipes 13 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 an embodiment of the invention, the preheating type steam distribution 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 upper joint 6 can limit the upward movement of the first on-off piece 4 and the second on-off piece 5 because the inner wall of the upper joint 6 protrudes out of the inner surface of the valve body 1, so that the first on-off piece 4 and the second on-off piece 5 are prevented from falling off when the preheating type steam distribution valve is lifted.

The operation of the preheating type steam distribution valve of the invention is described in detail below with reference to the accompanying drawings:

as shown in fig. 1 and 2, the preheating type steam distributing 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 first steam injection pipe 13 and the second end of the second steam injection pipe 14 are both 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 first steam injection pipe 13 and the second inner sleeve 51 blocks the steam inlet 12, a part of steam injected into the steam injection channel 11 enters the lower oil layer through the lower end of the steam injection channel 11, the other part of steam injected into the steam injection channel 11 enters the upper oil layer through the second steam injection pipe 14, and simultaneously preheats the upper oil layer and the lower oil layer, when a predetermined preheating amount is reached, the first blocking ball 42 is injected 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 way, namely the first blocking ball 42 blocks the first axial through hole 411, the first inner sleeve 41 and the first blocking ball 42 block the steam injection channel 11 because the outer peripheral surface of the first inner sleeve 41 is matched with the inner surface of the valve body 1 in a sealing way, 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 because the steam is injected into the steam injection channel 11 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 the steam pressure to be abutted against the annular boss, namely the first on-off member 4 moves to the second working position from the first working position, at the moment, the first steam injection pipe 13 is communicated with the steam injection channel 11, because the steam injection channel 11 is blocked by the first on-off member 4, the steam cannot be injected downwards, the second steam injection pipe 14 is blocked by the first on-off part 4, therefore, steam can only enter the upper oil layer for oil extraction through the first steam injection pipe 13;

when the injection amount reaches the design amount, the 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, and the outer circumferential surface of the second inner sleeve 51 is matched with the inner surface of the valve body 1 in a sealing manner, so that the second inner sleeve 51 and the second blocking ball 52 also block the steam injection channel 11, steam cannot pass through the second cut-off member 5, at this time, the pressure in the steam injection channel 11 positioned above the second inner sleeve 51 is continuously increased due to the continuous injection of steam into the steam injection channel 11, 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 under the action of steam pressure to abut against the first inner sleeve 41, 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 on-off member 4 and the second on-off member 5, the first on-off member 4 blocks the first steam injection pipe 13, and in a state that the second on-off member 5 is located at the second steam injection position, the second on-off member 5 blocks the first steam injection pipe 13, and the steam injection port 512 is communicated with the steam inlet 12, so that steam injected into the steam injection passage 11 can only enter the annular space 3 through the steam injection port 512 and the steam inlet 12, and enters the lower oil layer through the annular space 3, the steam exhaust port 16 and the bottom of the steam injection passage 11 for oil production.

In conclusion, the preheating type steam distribution valve provided by the invention realizes preheating of two oil layers by injecting steam in a general way at the initial steam injection stage by changing the positions of the first on-off piece and the second on-off piece, and after the preheating effect is achieved, steam is injected in layers, so that the highest pressure during the initial operation of a boiler is reduced, the operation of the boiler is facilitated, and the operation cost and the operation difficulty are not increased.

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 pre-heatable steam distribution valve, said pre-heatable steam distribution 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 first steam injection pipe, a second steam injection pipe, a stopping part and a steam exhaust port are sequentially arranged on the side wall of the valve body from top to bottom, the steam inlet and the steam exhaust port are communicated with the annular space, the stopping part is positioned in the steam injection channel, the first end of the first steam injection pipe and one end of the second steam injection pipe are communicated with the steam injection channel, and the second end of the first steam injection pipe and the second end of the second steam injection pipe extend 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 communicated with the steam injection channel and used for plugging the first steam injection pipe, the second working position is abutted against the stopping part, the first on-off part is used for plugging the steam injection channel and used for plugging the second steam injection pipe when the first on-off part is located at the second working position, and the first steam injection pipe is communicated with the steam injection channel; the steam injection device is characterized in that a steam injection port is 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 used for plugging the steam inlet, and a second steam injection position which is abutted against the first on-off part, the second on-off part plugs the first steam injection pipe when the second on-off part is located at the second steam injection position, and the steam injection port is communicated with the steam inlet.

2. A preheatable steam distribution 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 includes second endotheca and second shutoff ball, the second endotheca in first notes vapour position department through second shear pin with the valve body meets, just the outer peripheral face of second endotheca with the internal surface sealing cooperation of valve body, the second endotheca have with annotate the second axial perforating hole of vapour passageway intercommunication, first shutoff ball can pass second axial perforating hole, second shutoff ball can with second axial perforating hole sealing connection, annotate the vapour mouth set up in on the lateral wall of second endotheca, through second shutoff ball with the sealing connection of second axial perforating hole, the second endotheca can be cut second shear pin is by first notes vapour position removal to second notes vapour position.

3. A preheatable steam distribution 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. A preheatable steam distribution 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. A preheatable steam distribution 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. A preheatable steam distribution 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. A preheatable steam distribution 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 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. Preheating-type steam distribution valve according to any one of claims 1 to 7,

the first steam injection pipe and the second steam injection pipe are arranged in parallel, and a plurality of first steam injection pipes and a plurality of second steam injection pipes are arranged at intervals along the circumferential direction of the valve body.

9. Preheating-type steam distribution valve according to any one of claims 1 to 7,

the two ends of the outer sleeve are welded on the valve body.

10. Preheating-type steam distribution valve according to any one of claims 1 to 7,

the preheating type steam distribution 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, the valve body is connected with the upper joint through the screwing matching of the external thread and the internal thread.

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