阅读说明：本技术 一种注汽采油一体化变排量举升装置及方法 (Steam injection and oil extraction integrated variable-displacement lifting device and method ) 是由 王顺华 董臣强 荣雁 张方圆 孙立柱 岳继文 陶建强 姜东� 郑强 任延鹏 于 2020-05-27 设计创作，主要内容包括：本发明公开了一种注汽采油一体化变排量举升装置及方法,包括：大泵筒,所述大泵筒上端连接油管；大柱塞,所述大柱塞设置在大泵筒内部,所述大柱塞为中空结构；小泵筒,所述小泵筒上端连接大泵筒下端；小柱塞,所述小柱塞设置在小泵筒内部,所述小柱塞为实心结构；脱接器,所述脱接器上端连接大柱塞下端,脱接器下端连接小柱塞上端；注汽外管,所述注汽外管套在大泵筒及小泵筒外部,且注汽外管内壁与上述两泵筒外壁之间均构成环形注汽通道。本发明既可实现注汽采油一体化开采,又可实现排量与井况的动态匹配,缩短排水期,提高热能利用率,延长生产周期。(The invention discloses a variable displacement lifting device and method integrating steam injection and oil extraction, which comprises the following steps: the upper end of the large pump cylinder is connected with an oil pipe; the large plunger is arranged inside the large pump barrel and is of a hollow structure; the upper end of the small pump cylinder is connected with the lower end of the large pump cylinder; the small plunger is arranged inside the small pump barrel and is of a solid structure; the upper end of the disconnecting device is connected with the lower end of the large plunger, and the lower end of the disconnecting device is connected with the upper end of the small plunger; and the steam injection outer pipe is sleeved outside the large pump barrel and the small pump barrel, and annular steam injection channels are formed between the inner wall of the steam injection outer pipe and the outer walls of the two pump barrels. The invention can realize the integrated exploitation of steam injection and oil extraction, and can realize the dynamic matching of the discharge capacity and the well condition, shorten the drainage period, improve the heat energy utilization rate and prolong the production period.)

1. The utility model provides an injection oil recovery integration variable displacement lifting devices which characterized in that includes:

the upper end of the large pump cylinder is connected with an oil pipe;

the large plunger is arranged inside the large pump barrel and is of a hollow structure;

the upper end of the small pump cylinder is connected with the lower end of the large pump cylinder;

the small plunger is arranged inside the small pump barrel and is of a solid structure;

the upper end of the disconnecting device is connected with the lower end of the large plunger, and the lower end of the disconnecting device is connected with the upper end of the small plunger;

and the steam injection outer pipe is sleeved outside the large pump barrel and the small pump barrel, and annular steam injection channels are formed between the inner wall of the steam injection outer pipe and the outer walls of the two pump barrels.

2. The integrated variable displacement lifting device for steam injection and oil extraction as claimed in claim 1, wherein the upper end of the steam injection outer pipe is also connected with an oil pipe, and the lower end of the oil pipe is plugged to face the upper port of the annular steam injection channel.

3. The integrated variable displacement lifting device for steam injection and oil extraction as claimed in claim 1 or 2, wherein the large pump barrel is provided with a second radial steam injection hole which is communicated with the annular steam injection channel, the large plunger is provided with a first radial steam injection hole which is also communicated with the annular steam injection channel when the first steam injection hole runs to the second steam injection hole.

4. The integrated variable displacement lift device for steam injection and oil recovery of claim 3, further comprising:

the bottom end of the inner cavity of the large pump barrel is also provided with a bias cavity, the bottom of the bias cavity is provided with an oil feeding port communicated to the inner cavity of the steam injection outer pipe, the fixed valve is arranged in the bias cavity, and the fixed valve is used for blocking the oil feeding port in a one-way mode, namely the one-way valve.

5. The integrated variable displacement lifting device for steam injection and oil recovery as claimed in claim 4, further comprising:

the bottom port of the large plunger is provided with the traveling valve which also belongs to a one-way valve, and the lower port of the traveling valve is communicated with the offset cavity.

6. The integrated variable displacement lifting device for steam injection and oil extraction as claimed in claim 1, 2 or 4, wherein the upper end of the large plunger is provided with an oil outlet, the outer wall of the upper end of the small plunger is provided with an expanding limiting ring, and the outer diameter of the expanding limiting ring is larger than the inner diameter of the upper port of the small pump barrel.

7. The integrated variable displacement lifting device for steam injection and oil extraction as claimed in claim 6, wherein the upper end of the large plunger is connected with a sucker rod.

8. An integrated variable displacement lift for steam injection and oil recovery as claimed in claim 1, 2, 5 or 7 wherein said disconnect comprises:

the upper body of the disconnecting and connecting device is a clamping groove body and is connected to the lower end of the large plunger piston or the lower end of the traveling valve at the lower end of the large plunger piston;

the lower body of the disconnecting device is a clamping head which is clamped in the clamping groove body, and the lower end of the clamping head is connected with a small plunger.

9. An integrated variable displacement lifting method for steam injection and oil extraction is characterized by comprising the following steps:

lowering steam injection: during construction, the small plunger is preset in the small pump barrel and is put in along with the oil pipe, and the large plunger is put in along with the sucker rod; when the pump is bumped, the upper body and the lower body of the disconnecting device enter a butt joint state, the large plunger and the small plunger are connected in series into a whole, meanwhile, the large plunger and the steam injection hole on the large pump barrel enter an overlapped state, the construction of the steam injection channel is completed, and at the moment, hot steam injected into the well is injected into the stratum along with the steam injection channel;

after well stewing and blowout, lifting the sucker rod to drive the large plunger to move upwards until the disconnecting device is disconnected, naturally dropping the small plunger to the bottom of the pump, lifting the rod column to prevent impact distance, lowering the large plunger to a bottom dead center, and producing by using the large pump to realize large-displacement quick drainage; when the later liquid amount is not enough, the rod column is lowered through the oil pumping unit, the upper body of the disconnecting device and the lower body of the disconnecting device are butted again, the large plunger and the small plunger are connected in series into a whole, and then the connecting device is lifted to the original bottom dead center position, so that the displacement can be reduced, and the small pump is lifted.

10. The integrated variable displacement lifting method for steam injection and oil recovery as claimed in claim 9, characterized by comprising the following steps:

lifting steam injection: during construction, the small plunger is preset in the small pump barrel and is put in along with the oil pipe, and the large plunger is put in along with the sucker rod; when the pump is collided, the upper body and the lower body of the disconnecting device enter a butt joint state, the measuring is good, the anti-impact distance is good, marks are made on the rod column, then the pumping rod is lifted up to drive the plunger to go up in series until the disconnecting device is disconnected, at the moment, the small plunger naturally falls back to the bottom of the pump, the plunger is continuously lifted up to the outside of the pump barrel, the steam injection channel is constructed, and at the moment, hot steam injected into the well is injected into the stratum along with the steam injection channel;

after soaking and open flow, lowering the large plunger to the marked position, namely swabbing a bottom dead center, and producing by using a large pump at the moment to realize large-displacement quick drainage; when the later liquid amount is not enough, the rod column is lowered through the oil pumping unit, the upper body of the disconnecting device and the lower body of the disconnecting device are butted again, the large plunger and the small plunger are connected in series into a whole, and then the connecting device is lifted to the original bottom dead center position, so that the displacement can be reduced, and the small pump is lifted.

Technical Field

The invention relates to the technical field of steam huff and puff exploitation of heavy oil wells, in particular to a steam injection and oil extraction integrated variable displacement lifting device and method.

Background

In the exploitation mode of the steam huff and puff well, the injection-production integrated technology is widely applied, the utilization rate of injected heat energy can be effectively improved, the exploitation effect of the huff and puff well can be improved, the construction process can be saved, and the operation cost can be reduced.

The formation water storage of the steam huff-and-puff well is continuously increased along with the rise of the turns, and the time for draining water in the early stage of pumping is longer and longer. Meanwhile, due to the physical properties of the stratum and crude oil, the huff and puff periods of a plurality of huff and puff wells are too short, the only oil extraction time is limited by the discharge capacity of the oil pump, the water drainage time is large, the effective oil extraction time is short, the discharge capacity of the oil pump needs to be improved, and the water drainage period needs to be shortened. And at the later stage of the oil extraction stage, the liquid amount is greatly reduced, and the discharge capacity of the oil well pump needs to be reduced to realize the coordination of supply and discharge. The contradiction between the early-stage quick drainage and the later-stage slow oil recovery is gradually increased, and the demand of the variable displacement oil recovery technology is increasingly increased.

In view of this, the demands of the injection-production integration technology and the variable displacement lifting technology are increasingly overlapping. The existing lifting method can meet the requirements of single injection-production integration or single variable displacement lifting, such as a long-plunger injection-production pump, a bias valve oil well pump and the like, can realize the integration of steam injection and oil production, achieves the purposes of saving construction procedures and reducing operation cost, but cannot complete displacement conversion; the conventional variable-displacement oil well pump can realize variable-displacement lifting, realizes the supply and discharge matching of the fore-and-aft period of the huff and puff well, improves the oil-gas ratio, but does not have the steam injection function and cannot realize the injection and production integration. Therefore, a lifting method and a lifting device which combine the injection-mining integrated mining function and the variable displacement lifting function into a whole are not seen at present.

Application No.: 201910395250.2, filing date: 2019-05-13 relates to a tandem double-acting injection pump for a high water-cut oil well, which mainly comprises a disconnector, an upper tubing coupling, a double-acting oil-well pump assembly, an intermediate coupling, an intermediate pump cylinder, a core bar, a double-acting water injection pump assembly, a swirler assembly and a flow passage, wherein the upper end of the double-acting oil-well pump assembly is connected with the upper tubing coupling, an upper plunger is arranged in the double-acting oil-well pump assembly, the disconnector is arranged at the upper end of the disconnector joint of the upper plunger, the lower end of the double-acting oil-well pump assembly is sequentially connected with the intermediate coupling and the intermediate pump cylinder, the lower end of the intermediate pump cylinder is connected with the double-acting water injection pump assembly, a lower plunger is arranged in the double-acting water injection pump assembly, the lower plunger is connected with the upper plunger through the core bar, and the swirler assembly is arranged at the lower end of the double-acting water injection pump assembly. The pumping rod reciprocates once, and the pump finishes oil extraction twice and water injection twice respectively, so that the flow fluctuation of liquid entering the downhole cyclone can be reduced, and the separation efficiency of the downhole cyclone is improved.

Application No.: 201320847954.7, filing date: 2013-12-22 relates to an oil extraction device, in particular to a serial injection pump, which has the technical scheme that: the oil pumping device comprises an oil pipe, a pumping rod, a small pump barrel, a small plunger, a disconnecting device, a large pump barrel and a large plunger, wherein the pumping rod is arranged in the oil pipe, the oil pipe is sequentially connected with the small pump barrel and the large pump barrel from top to bottom, the small plunger is arranged in the small pump barrel, the large plunger is arranged in the large pump barrel, the pumping rod is connected with the small plunger, and the small plunger is connected with the large plunger through the disconnecting device; the utility model has the advantages that: the structure that oil recovery double-plunger pump establishes ties realizes annotating and adopts the integration, has improved work efficiency, realizes changeing fast and takes out, has improved oil field production efficiency.

Application No.: 201120187629.3, filing date: 2011-05-24 discloses an ultra-thick oil injection and production oil well pump, which is particularly suitable for the production of ultra-thick oil wells. The utility model discloses by taking off and connecing ware (2), pump barrel assembly (6), plunger assembly (12), solid fixed valve assembly (19) are constituteed, hollow sucker rod is connected through taking off and connecing ware (2) in plunger assembly (12), plunger (7), it has a plurality of plungers to annotate vapour groove (8) and pump barrel to annotate vapour groove (9) to open on pump barrel (10), an urceolus (11) are equipped with to pump barrel (10) outside, urceolus (11) are last, the lower extreme passes through urceolus top connection (5), thermal-insulated oil pipe is connected to urceolus lower clutch (20), a catch (16) is equipped with between plunger lower clutch (13) and solid fixed valve top connection (18), because have taking off and connecing ware (2) between oil-well pump and the hollow sucker rod, can realize pouring into hollow sucker rod again after the steam has been annotated, thereby can realize oozing hot water technology and electric heating technology on the pump, and can annotate steam to the stratum at arbitrary well section.

Application No.: 201320025350.4, filing date: 2013-01-07 discloses an integrated oil well pump for steam injection and oil extraction of super heavy oil, which is particularly suitable for the exploitation of super heavy oil wells. The utility model discloses by taking off and connecing ware assembly (2), sealed locking assembly (5), pump barrel assembly (10), plunger assembly (11), standing valve assembly (18) are constituteed, open the lower part of plunger lower clutch (13) of its plunger assembly (11) has a groove (14) and two spiral jack catch (15), ejector pin (16) and horizontal pole (17) that a cross links to each other are equipped with to the upper portion of standing valve assembly (18), open the support ring (8) up end of pump barrel assembly (10) has one and sealed locking assembly (5) sealing ring (6) matched with conical surface, open the lower terminal surface of support ring (8) of pump barrel assembly (10) has one and sealed locking assembly (5) jack catch (7) matched with conical surface; the utility model discloses can realize big pump footpath oil-well pump and annotate steam thermal recovery and mix heating technology such as hot water or cable heating on the pump to can annotate steam to the stratum at arbitrary well section.

Application No.: 200520114995.0, filing date: 2005-08-03 discloses a high-efficiency energy-saving thick oil pump with a rod, which comprises a polish rod, an oil pipe, a traveling valve, a plunger, a pump cylinder, a sealed polish rod, a sealed short section, a fixed valve, a disconnecting mechanism and a fixed valve seat. The device is characterized in that the fixed valve is positioned at the top of the pump cylinder, the traveling valve is arranged below the fixed valve seat, a large-diameter pump cylinder with an enlarged inner diameter is arranged in the middle of the pump cylinder, and a spring ejector rod is arranged and fixed in a channel of the fixed valve. The formation fluid can generate an upward force on the plunger, so that the energy conservation of the pumping unit is realized, and the pumping efficiency is improved under the double actions of the upward inertia force of the formation fluid and the active downward capturing force of the plunger. The pump can meet the requirements of steam huff and puff or steam injection and oil extraction of a steam-driven oil well, and can also meet the technical requirements of acidification, blockage removal, paraffin removal, scale removal and the like under the condition that the oil well does not move a tubular column.

Application No.: 89206034.4, filing date: 1989-04-28A variable displacement thick oil pump for steam production is provided, which comprises an oil inlet valve connected between the pump barrel and the sealing short joint, and a disconnecting device (6) connected between the pump plunger and the polish rod, so that the plunger and the polish rod can be disconnected or connected at will. The cavity is enlarged along with the separation of the plunger and the polish rod; the size of the pump body is reduced along with the butt joint of the plunger and the polished rod, so that the liquid discharge amount of the pump is also changed. The pump not only realizes the pumping change of the fixed pipe column after steam injection, but also meets the production requirements of each stage of steam injection and oil extraction, and in the same steam handling period, the pump production does not need to be changed, thereby reducing the heat loss of an oil layer, prolonging the pump detection period and improving the oil well yield.

The technical scheme of the disclosed technology, the technical problems to be solved and the beneficial effects are all different from the technical scheme of the invention, or the technical field or the application occasion is different, and no technical inspiration exists in the technical scheme disclosed above.

Disclosure of Invention

The invention aims to provide a steam injection and oil extraction integrated variable displacement lifting device and method, which can realize steam injection and oil extraction integrated extraction, can realize dynamic matching of displacement and well conditions, shorten the drainage period, improve the heat energy utilization rate and prolong the production cycle.

In order to achieve the purpose, the invention adopts the following technical scheme:

an injection and oil extraction integrated variable displacement lifting device comprises:

the upper end of the large pump cylinder is connected with an oil pipe;

the large plunger is arranged inside the large pump barrel and is of a hollow structure;

the upper end of the small pump cylinder is connected with the lower end of the large pump cylinder;

the small plunger is arranged inside the small pump barrel and is of a solid structure;

the upper end of the disconnecting device is connected with the lower end of the large plunger, and the lower end of the disconnecting device is connected with the upper end of the small plunger;

and the steam injection outer pipe is sleeved outside the large pump barrel and the small pump barrel, and annular steam injection channels are formed between the inner wall of the steam injection outer pipe and the outer walls of the two pump barrels.

Furthermore, the upper end of the steam injection outer pipe is also connected with an oil pipe, and the lower end of the oil pipe is plugged towards the upper port of the annular steam injection channel.

Furthermore, the large pump barrel is provided with a second radial steam injection hole which is communicated with the annular steam injection channel, the large plunger is provided with a first radial steam injection hole, and the first steam injection hole is also communicated with the annular steam injection channel when running to the second steam injection hole.

Further, still include:

the bottom end of the inner cavity of the large pump barrel is also provided with a bias cavity, the bottom of the bias cavity is provided with an oil feeding port communicated to the inner cavity of the steam injection outer pipe, the fixed valve is arranged in the bias cavity, and the fixed valve is used for blocking the oil feeding port in a one-way mode, namely the one-way valve.

Further, still include:

the bottom port of the large plunger is provided with the traveling valve which also belongs to a one-way valve, and the lower port of the traveling valve is communicated with the offset cavity.

Furthermore, an oil outlet is formed in the upper end of the large plunger, an expanding limiting ring is arranged on the outer wall of the upper end of the small plunger, and the outer diameter of the expanding limiting ring is larger than the inner diameter of an upper port of the small pump barrel.

Further, the upper end of the large plunger is connected with a sucker rod.

Further, the disconnector comprises:

the upper body of the disconnecting and connecting device is a clamping groove body and is connected to the lower end of the large plunger piston or the lower end of the traveling valve at the lower end of the large plunger piston;

the lower body of the disconnecting device is a clamping head which is clamped in the clamping groove body, and the lower end of the clamping head is connected with a small plunger.

In order to achieve the purpose, the invention adopts the following technical scheme:

an integrated variable displacement lifting method for steam injection and oil extraction comprises the following steps:

lowering steam injection: during construction, the small plunger is preset in the small pump barrel and is put in along with the oil pipe, and the large plunger is put in along with the sucker rod; when the pump is bumped, the upper body and the lower body of the disconnecting device enter a butt joint state, the large plunger and the small plunger are connected in series into a whole, meanwhile, the large plunger and the steam injection hole on the large pump barrel enter an overlapped state, the construction of the steam injection channel is completed, and at the moment, hot steam injected into the well is injected into the stratum along with the steam injection channel;

after well stewing and blowout, lifting the sucker rod to drive the large plunger to move upwards until the disconnecting device is disconnected, naturally dropping the small plunger to the bottom of the pump, lifting the rod column to prevent impact distance, lowering the large plunger to a bottom dead center, and producing by using the large pump to realize large-displacement quick drainage; when the later liquid amount is not enough, the rod column is lowered through the oil pumping unit, the upper body of the disconnecting device and the lower body of the disconnecting device are butted again, the large plunger and the small plunger are connected in series into a whole, and then the connecting device is lifted to the original bottom dead center position, so that the displacement can be reduced, and the small pump is lifted.

Further, the method comprises the following steps:

lifting steam injection: during construction, the small plunger is preset in the small pump barrel and is put in along with the oil pipe, and the large plunger is put in along with the sucker rod; when the pump is collided, the upper body and the lower body of the disconnecting device enter a butt joint state, the measuring is good, the anti-impact distance is good, marks are made on the rod column, then the pumping rod is lifted up to drive the plunger to go up in series until the disconnecting device is disconnected, at the moment, the small plunger naturally falls back to the bottom of the pump, the plunger is continuously lifted up to the outside of the pump barrel, the steam injection channel is constructed, and at the moment, hot steam injected into the well is injected into the stratum along with the steam injection channel;

after soaking and open flow, lowering the large plunger to the marked position, namely swabbing a bottom dead center, and producing by using a large pump at the moment to realize large-displacement quick drainage; when the later liquid amount is not enough, the rod column is lowered through the oil pumping unit, the upper body of the disconnecting device and the lower body of the disconnecting device are butted again, the large plunger and the small plunger are connected in series into a whole, and then the connecting device is lifted to the original bottom dead center position, so that the displacement can be reduced, and the small pump is lifted.

Compared with the prior art, the invention has the following beneficial effects:

according to the on-site process requirements, the large plunger piston is put to the bottom or is completely lifted out of the pump barrel, so that a steam injection channel can be constructed, and the steam injection function is realized; the large plunger or the plunger string is lifted for a certain distance, the large pump barrel and the side hole on the large plunger are staggered, the steam injection hole is closed, and the position is used as the bottom dead center of pumping, so that oil extraction production can be carried out. When the large pump barrel and the large plunger are matched for production independently, the lifting capacity is high, the discharge capacity is high, and early-stage quick liquid drainage of a huff-puff well can be realized; after the disconnecting and connecting device is in butt joint and a serial plunger string is formed, the lifting capacity is reduced, the discharge capacity is reduced, but the feedback force is increased, and the working condition at the later stage of throughput is better adapted. And the injection-production integrated variable displacement lifting can be realized by operating according to the functions.

The lifting method and the lifting device can be applied to a steam huff-puff well, can realize the integrated exploitation of steam injection and oil extraction, can also realize the dynamic matching of the discharge capacity and the well condition, shorten the drainage period and improve the heat energy utilization rate. Has wide application prospect.

Drawings

Fig. 1 is a schematic structural diagram of an integrated variable displacement lifting device for steam injection and oil extraction.

In the figure: 1-large pump cylinder; 2-large plunger; 3-steam injection outer pipe; 4-steam injection hole; 5-the upper body of the disconnecting and connecting device; 6-the lower body of the disconnector; 7-small pump cylinder; 8-small plunger; 9-traveling valve; 10-a fixed valve; 11-sucker rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

referring to fig. 1, the present invention provides a technical solution:

an injection and oil extraction integrated variable displacement lifting device comprises:

the upper end of the large pump cylinder is connected with an oil pipe;

the large plunger 2 is arranged inside the large pump barrel and is of a hollow structure;

the upper end of the small pump cylinder is connected with the lower end of the large pump cylinder;

the small plunger 8 is arranged inside the small pump barrel and is of a solid structure;

the upper end of the disconnecting device is connected with the lower end of the large plunger, and the lower end of the disconnecting device is connected with the upper end of the small plunger;

and the steam injection outer pipe 3 is sleeved outside the large pump barrel and the small pump barrel, and annular steam injection channels are formed between the inner wall of the steam injection outer pipe and the outer walls of the two pump barrels.

Furthermore, the upper end of the steam injection outer pipe is also connected with an oil pipe, and the lower end of the oil pipe is plugged towards the upper port of the annular steam injection channel.

Furthermore, the large pump barrel is provided with a second radial steam injection hole which is communicated with the annular steam injection channel, the large plunger is provided with a first radial steam injection hole, and the first steam injection hole is also communicated with the annular steam injection channel when running to the second steam injection hole. And marking a label for the two steam injection holes on the drawing, namely the steam injection hole 4.

Further, still include:

the bottom end of the inner cavity of the large pump barrel is further provided with an offset cavity, the bottom of the offset cavity is provided with an oil feeding port communicated to the inner cavity of the steam injection outer pipe, the fixed valve is installed in the offset cavity, and the fixed valve is used for blocking the oil feeding port in a one-way mode, namely the one-way valve.

Further, still include:

and the bottom port of the large plunger piston is provided with a traveling valve 9 which also belongs to a one-way valve, and the lower port of the traveling valve is communicated with the offset cavity.

Furthermore, an oil outlet is formed in the upper end of the large plunger, an expanding limiting ring is arranged on the outer wall of the upper end of the small plunger, and the outer diameter of the expanding limiting ring is larger than the inner diameter of an upper port of the small pump barrel.

Further, the upper end of the large plunger is connected with a sucker rod 11.

Further, the disconnector comprises:

the upper body of the disconnecting and connecting device is a clamping groove body and is connected to the lower end of the large plunger piston or the lower end of the traveling valve at the lower end of the large plunger piston;

the lower body of the disconnecting device 6 is a clamping head which is clamped in the clamping groove body, and the lower end of the clamping head is connected with a small plunger.

The device consists of a large pump barrel 1, a large plunger 2, a steam injection outer pipe 3, a disconnecting device upper body 5, a disconnecting device lower body 6, a small pump barrel 7, a small plunger 8, a traveling valve 9 and a fixed valve 10. The big plunger 2 is connected with the sucker rod 11 and can move up and down along with the sucker rod. The large pump barrel 1 and the large plunger 2 are provided with side holes, and the side holes can be butted when colliding with a pump to form a steam injection hole 4 so as to provide a passage for hot steam to enter an oil layer. In addition, the large plunger 2 is completely lifted out of the pump cylinder, and a steam injection channel can be formed by the way of abdication. After the hot steam comes out of the steam injection hole, the hot steam descends to the position below the pump along a wall clamping cavity constructed by the steam injection outer pipe 3 and enters an oil layer. The upper body 5 of the disconnecting device is connected with the lower end of the large plunger 2, the lower body 6 of the disconnecting device is connected with the upper end of the small plunger 8, the two can realize butt joint through a pump collision, and realize disconnection after lifting for a certain stroke, the butt joint and the disconnection of the disconnecting device are used for realizing butt joint and disconnection between the large plunger 2 and the small plunger 8, when the disconnecting device is in butt joint, the large plunger 2 and the small plunger 8 are connected in series to form a plunger string, and can move up and down along with the sucker rod 11.

The injection-production integrated variable displacement lifting method is realized by the device: according to the on-site process requirements, the large plunger 2 is put to the bottom, or the large plunger 2 is completely lifted out of the pump barrel, so that a steam injection channel can be constructed, and the steam injection function is realized; and lifting the large plunger or the plunger string for a certain distance to enable the side holes on the large pump barrel 1 and the large plunger 2 to be staggered, closing the steam injection hole, and taking the position as a bottom dead center of pumping, thereby carrying out oil extraction production. When the large pump barrel 1 and the large plunger 2 are used for production independently, the lifting capacity is high, the discharge capacity is high, and early-stage quick liquid drainage of a huff-puff well can be realized; after the disconnecting and connecting device is in butt joint and a serial plunger string is formed, the lifting capacity is reduced, the discharge capacity is reduced, but the feedback force is increased, and the working condition at the later stage of throughput is better adapted. And the injection-production integrated variable displacement lifting can be realized by operating according to the functions.

Mode one (downward steam injection): during construction, the small plunger 8 is preset in the small pump barrel 7 and is lowered along with an oil pipe, and the large plunger 2 is lowered along with the sucker rod 11. When the pump is bumped, the upper body 5 and the lower body 6 of the disconnecting device enter a butt joint state, the large plunger and the small plunger are connected in series into a whole, meanwhile, the large plunger 2 and the steam injection hole 4 on the large pump barrel 1 enter an overlapped state, the construction of a steam injection channel is completed, and at the moment, hot steam injected into the well is injected into a stratum along with the steam injection channel.

After well stewing and open flow, the pumping rod 11 is lifted up to drive the large plunger to move upwards until the disconnecting device is disconnected, at the moment, the small plunger 8 naturally falls back to the bottom of the pump, after the rod column is lifted to prevent impact distance, the large plunger is lowered to a bottom dead center, and at the moment, the large pump is used for production alone, so that rapid liquid drainage is realized. When the later liquid amount is not enough, the rod column is lowered through the oil pumping unit, the upper body 5 of the disconnecting device and the lower body 6 of the disconnecting device are butted again, the large plunger and the small plunger are connected in series into a whole, and then the upper body of the disconnecting device and the lower body of the disconnecting device are lifted to the original bottom dead center position, so that the displacement can be reduced, and the small pump is lifted.

Mode two (steam injection upwards): during construction, the small plunger 8 is preset in the small pump barrel 7 and is lowered along with an oil pipe, and the large plunger 2 is lowered along with the sucker rod 11. When the pump is bumped, the upper body 5 and the lower body 6 of the disconnecting device enter a butt joint state, the measuring is good, the anti-impact distance is good, marks are made on a rod column, then the pumping rod 11 is lifted up to drive the plunger to go up in series until the disconnecting device is disconnected, at the moment, the small plunger 8 naturally falls back to the bottom of the pump, the plunger 2 is continuously lifted up to the outside of the pump barrel, the steam injection channel is constructed, and at the moment, hot steam injected into the well is injected into the stratum along with the steam injection channel.

After the well is closed and the open flow is carried out, the large plunger piston is lowered to the mark which is made before, namely, the bottom dead center is swabbed, and the large pump is used for production at the moment, so that the rapid liquid drainage is realized. When the later liquid amount is not enough, the rod column is lowered through the oil pumping unit, the upper body 5 of the disconnecting device and the lower body 6 of the disconnecting device are butted again, the large plunger and the small plunger are connected in series into a whole, and then the upper body of the disconnecting device and the lower body of the disconnecting device are lifted to the original bottom dead center position, so that the displacement can be reduced, and the small pump is lifted.

Example 2:

referring to fig. 1, the present invention provides a technical solution:

an injection and oil extraction integrated variable displacement lifting device comprises:

the upper end of the large pump cylinder is connected with an oil pipe;

the large plunger 2 is arranged inside the large pump barrel and is of a hollow structure;

the upper end of the small pump cylinder is connected with the lower end of the large pump cylinder;

the small plunger 8 is arranged inside the small pump barrel and is of a solid structure;

the upper end of the disconnecting device is connected with the lower end of the large plunger, and the lower end of the disconnecting device is connected with the upper end of the small plunger;

and the steam injection outer pipe 3 is sleeved outside the large pump barrel and the small pump barrel, and annular steam injection channels are formed between the inner wall of the steam injection outer pipe and the outer walls of the two pump barrels.

Furthermore, the upper end of the steam injection outer pipe is also connected with an oil pipe, and the lower end of the oil pipe is plugged towards the upper port of the annular steam injection channel.

Furthermore, the large pump barrel is provided with a second radial steam injection hole which is communicated with the annular steam injection channel, the large plunger is provided with a first radial steam injection hole, and the first steam injection hole is also communicated with the annular steam injection channel when running to the second steam injection hole. And marking a label for the two steam injection holes on the drawing, namely the steam injection hole 4.

Further, still include:

the bottom end of the inner cavity of the large pump barrel is further provided with an offset cavity, the bottom of the offset cavity is provided with an oil feeding port communicated to the inner cavity of the steam injection outer pipe, the fixed valve is installed in the offset cavity, and the fixed valve is used for blocking the oil feeding port in a one-way mode, namely the one-way valve.

Further, still include:

and the bottom port of the large plunger piston is provided with a traveling valve 9 which also belongs to a one-way valve, and the lower port of the traveling valve is communicated with the offset cavity.

Furthermore, an oil outlet is formed in the upper end of the large plunger, an expanding limiting ring is arranged on the outer wall of the upper end of the small plunger, and the outer diameter of the expanding limiting ring is larger than the inner diameter of an upper port of the small pump barrel.

Further, the upper end of the large plunger is connected with a sucker rod 11.

Example 3:

referring to fig. 1, the present invention provides a technical solution:

an injection and oil extraction integrated variable displacement lifting device comprises:

the upper end of the large pump cylinder is connected with an oil pipe;

the large plunger 2 is arranged inside the large pump barrel and is of a hollow structure;

the upper end of the small pump cylinder is connected with the lower end of the large pump cylinder;

the small plunger 8 is arranged inside the small pump barrel and is of a solid structure;

the upper end of the disconnecting device is connected with the lower end of the large plunger, and the lower end of the disconnecting device is connected with the upper end of the small plunger;

and the steam injection outer pipe 3 is sleeved outside the large pump barrel and the small pump barrel, and annular steam injection channels are formed between the inner wall of the steam injection outer pipe and the outer walls of the two pump barrels.

Furthermore, the upper end of the steam injection outer pipe is also connected with an oil pipe, and the lower end of the oil pipe is plugged towards the upper port of the annular steam injection channel.

Furthermore, the large pump barrel is provided with a second radial steam injection hole which is communicated with the annular steam injection channel, the large plunger is provided with a first radial steam injection hole, and the first steam injection hole is also communicated with the annular steam injection channel when running to the second steam injection hole. And marking a label for the two steam injection holes on the drawing, namely the steam injection hole 4.

Further, still include:

the bottom end of the inner cavity of the large pump barrel is further provided with an offset cavity, the bottom of the offset cavity is provided with an oil feeding port communicated to the inner cavity of the steam injection outer pipe, the fixed valve is installed in the offset cavity, and the fixed valve is used for blocking the oil feeding port in a one-way mode, namely the one-way valve.

Further, still include:

and the bottom port of the large plunger piston is provided with a traveling valve 9 which also belongs to a one-way valve, and the lower port of the traveling valve is communicated with the offset cavity.

Example 4:

referring to fig. 1, the present invention provides a technical solution:

an injection and oil extraction integrated variable displacement lifting device comprises:

the upper end of the large pump cylinder is connected with an oil pipe;

the large plunger 2 is arranged inside the large pump barrel and is of a hollow structure;

the upper end of the small pump cylinder is connected with the lower end of the large pump cylinder;

the small plunger 8 is arranged inside the small pump barrel and is of a solid structure;

the upper end of the disconnecting device is connected with the lower end of the large plunger, and the lower end of the disconnecting device is connected with the upper end of the small plunger;

and the steam injection outer pipe 3 is sleeved outside the large pump barrel and the small pump barrel, and annular steam injection channels are formed between the inner wall of the steam injection outer pipe and the outer walls of the two pump barrels.

Furthermore, the upper end of the steam injection outer pipe is also connected with an oil pipe, and the lower end of the oil pipe is plugged towards the upper port of the annular steam injection channel.

Furthermore, the large pump barrel is provided with a second radial steam injection hole which is communicated with the annular steam injection channel, the large plunger is provided with a first radial steam injection hole, and the first steam injection hole is also communicated with the annular steam injection channel when running to the second steam injection hole. And marking a label for the two steam injection holes on the drawing, namely the steam injection hole 4.

Example 5:

referring to fig. 1, the present invention provides a technical solution:

an injection and oil extraction integrated variable displacement lifting device comprises:

the upper end of the large pump cylinder is connected with an oil pipe;

the large plunger 2 is arranged inside the large pump barrel and is of a hollow structure;

the upper end of the small pump cylinder is connected with the lower end of the large pump cylinder;

the small plunger 8 is arranged inside the small pump barrel and is of a solid structure;

the upper end of the disconnecting device is connected with the lower end of the large plunger, and the lower end of the disconnecting device is connected with the upper end of the small plunger;

and the steam injection outer pipe 3 is sleeved outside the large pump barrel and the small pump barrel, and annular steam injection channels are formed between the inner wall of the steam injection outer pipe and the outer walls of the two pump barrels.

Furthermore, the upper end of the steam injection outer pipe is also connected with an oil pipe, and the lower end of the oil pipe is plugged towards the upper port of the annular steam injection channel.

Example 6:

referring to fig. 1, the present invention provides a technical solution:

an injection and oil extraction integrated variable displacement lifting device comprises:

the upper end of the large pump cylinder is connected with an oil pipe;

the large plunger 2 is arranged inside the large pump barrel and is of a hollow structure;

the upper end of the small pump cylinder is connected with the lower end of the large pump cylinder;

the small plunger 8 is arranged inside the small pump barrel and is of a solid structure;

the upper end of the disconnecting device is connected with the lower end of the large plunger, and the lower end of the disconnecting device is connected with the upper end of the small plunger;

and the steam injection outer pipe 3 is sleeved outside the large pump barrel and the small pump barrel, and annular steam injection channels are formed between the inner wall of the steam injection outer pipe and the outer walls of the two pump barrels.

Although fig. 1 is used for all the above embodiments, it is obvious to those skilled in the art that a separate drawing is not shown as long as the parts or structural features missing in the embodiments are removed from the drawing. As will be clear to the skilled person. Of course, the embodiments with more components are only the best embodiments, and the embodiments with less components are the basic embodiments, but the basic objects of the invention can also be achieved, so all of them are within the protection scope of the invention.

All parts and parts which are not discussed in the present application and the connection mode of all parts and parts in the present application belong to the known technology in the technical field, and are not described again. Such as welding, threaded connections, etc.

In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.