CN107829710B - Annular valve plate type underground safety device - Google Patents
Annular valve plate type underground safety device Download PDFInfo
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- CN107829710B CN107829710B CN201710822108.2A CN201710822108A CN107829710B CN 107829710 B CN107829710 B CN 107829710B CN 201710822108 A CN201710822108 A CN 201710822108A CN 107829710 B CN107829710 B CN 107829710B
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- 238000007789 sealing Methods 0.000 claims abstract description 66
- 238000003780 insertion Methods 0.000 claims abstract description 35
- 230000037431 insertion Effects 0.000 claims abstract description 35
- 238000005086 pumping Methods 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 230000007246 mechanism Effects 0.000 claims description 28
- 239000011148 porous material Substances 0.000 claims description 19
- 125000004122 cyclic group Chemical group 0.000 claims description 4
- 239000012530 fluid Substances 0.000 abstract description 15
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Display Devices Of Pinball Game Machines (AREA)
Abstract
An annular valve plate type downhole safety device is disclosed, comprising a main body, an upper cover positioned above the main body and a lower cover positioned below the main body; the main body is provided with a hollow channel and an inner sealing insertion pipe penetrating through the hollow channel, the top end of the inner sealing insertion pipe is used for being communicated with an oil pumping pipe, and the bottom end of the inner sealing insertion pipe is used for being communicated with a pump cylinder at the bottom end of an oil pipe column; the inner hole arranged in the inner sealing insertion pipe forms an independent transmission channel between the pump barrel and the oil pumping pipe. The application relates to but not limited to offshore oil exploitation technology, and the application of the application can effectively overcome the defects in the prior art, and can realize that downhole fluid can still return in a controlled manner when a sucker rod or a small oil pipe is placed in an oil pipe.
Description
Technical Field
the application relates to but is not limited to offshore oil exploitation technology, in particular to an annular valve plate type downhole safety device.
background
According to relevant regulations of national marine oil safety production, offshore gas wells, spontaneous injection wells and spontaneous overflow wells are provided with downhole packers; a downhole safety valve is arranged below the surface of the sea bed by 30 meters, so that the damage to an ocean platform and an ocean environment caused by the accidental upward return of downhole fluid is prevented.
at present, a plurality of large cement pile leg type platforms are put into use, and as the platform space becomes larger, a plurality of rod pumps, such as a belt pumping unit or a chain pumping unit, are sequentially applied to an offshore platform; in addition, some complex oil production technologies like the core-tube jet pump oil production technology are also applied to offshore platforms.
however, these oil recovery techniques usually require a sucker rod or small oil pipe to be placed in the oil pipe, which directly results in the failure of the prior art downhole safety valve due to the valve plate being blocked by the sucker rod or small oil pipe, and the prior art downhole safety valve cannot be normally opened and closed.
Disclosure of Invention
The technical problem that this application was solved provides an annular valve plate formula safety device in pit, can effectively overcome the defect that exists among the prior art, and fluid in the pit still can return out with controlling when can realizing placing sucker rod or little oil pipe in the oil pipe.
in order to solve the technical problem, the application provides an annular valve plate type downhole safety device which comprises a main body, an upper cover positioned above the main body and a lower cover positioned below the main body;
the main body is provided with a hollow channel and an inner sealing insertion pipe penetrating through the hollow channel, the top end of the inner sealing insertion pipe is used for being communicated with an oil pumping pipe, and the bottom end of the inner sealing insertion pipe is used for being communicated with a pump cylinder at the bottom end of an oil pipe column; the inner hole arranged in the inner sealing insertion pipe forms an independent transmission channel between the pump barrel and the oil pumping pipe.
The annular valve plate type underground safety device can also be characterized in that,
A central pipe sleeved outside the inner sealing insertion pipe is arranged in the upper cover, and an annular cavity between the upper cover and the central pipe forms a second annular flow passage for oil and gas conveying of the sucker rod pump; the main body is provided with a plurality of pore channels, the top ends of the pore channels are communicated with the second annular flow channel, and a plugging mechanism for plugging the bottom ends of the pore channels is arranged in the lower cover;
the plugging mechanism is connected with a control mechanism, and the control mechanism is used for controlling the switching between the opening state and the plugging state of the plugging mechanism.
the annular valve plate type underground safety device can also be characterized in that,
The plugging mechanism comprises a cone positioned in the lower cover, the top end face of the cone is an external conical surface, the bottom inner edge of the main body is an internal conical surface, the bottom end of the pore passage is positioned in the internal conical surface, and conical surfaces between the external conical surface and the internal conical surface are matched to form a conical surface sealing structure.
The annular valve plate type underground safety device can also be characterized in that,
the plugging mechanism further comprises a spring and a centering ring sleeved on the outer side of the cone, an annular step surface is arranged in the lower cover, the top end of the spring is in contact with the centering ring, the bottom end of the spring is in contact with the annular step surface of the lower cover, and the bottom end of the cone is inserted into a middle channel of the annular step surface.
The annular valve plate type underground safety device can also be characterized in that,
the control mechanism comprises a piston cavity arranged on the main body and a columnar piston arranged in the piston cavity, the bottom end of the columnar piston is connected with the righting ring, and a hydraulic control connecting port communicated with a hydraulic control pipeline is arranged at the top end of the piston cavity.
The annular valve plate type underground safety device can also be characterized in that,
the top end of the upper cover is communicated with an oil feeding pipe, and the bottom end of the upper cover is sleeved on the outer edge of the top end of the main body; the top end of the lower cover is sleeved on the outer edge of the bottom end of the main body, and the bottom end of the lower cover is communicated with a lower oil pipe.
The annular valve plate type underground safety device can also be characterized in that,
the upper cover and the upper oil pipe, and the lower cover and the lower oil pipe are in threaded connection through oil pipes; and the upper cover and the main body and the lower cover and the main body are in sealed threaded connection.
The annular valve plate type underground safety device can also be characterized in that,
the bottom end of the central tube is connected with the inner edge of the top end of the main body, the top end of the inner sealing insertion tube penetrates through the inside of the central tube and is communicated with the oil pumping tube, and a sealing surface is arranged between the inner sealing insertion tube and the central tube.
The annular valve plate type underground safety device can also be characterized in that,
the outside cover of interior seal intubate is equipped with sealed piston, and sealed piston's lateral wall is provided with cyclic annular seal groove, is provided with the sealing washer in the cyclic annular seal groove, the sealing washer is used for constituting sealed face between interior seal intubate and the center tube.
the annular valve plate type underground safety device can also be characterized in that,
And the top end of the columnar piston is provided with a columnar piston seal.
the above technical scheme of this application has following beneficial effect:
Compared with the prior art, the annular valve plate type downhole safety device provided by the invention can be applied to a rod pump or a concentric tube jet pump, and can avoid the problem that the conventional downhole safety device cannot be used on the rod pump or the concentric tube jet pump; in addition, the underground safety device provided by the invention allows a sucker rod or a small oil pipe to be placed in the valve body, so that underground fluid is pumped to the ground, namely the normal production of the sucker rod cannot be influenced by the operation of the safety device; in addition, when an emergency occurs, the underground safety device is closed in time by cutting off the pressure of the ground hydraulic control pipeline, so that underground fluid is prevented from returning upwards, and offshore platform equipment, safety and marine environment are protected.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the invention. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
the accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
FIG. 1 is a schematic diagram of the application of the present invention;
FIG. 2 is a schematic view of the overall structure of the present invention in the closed state;
FIG. 3 is a schematic view of the lower half of the present invention in the open state;
FIG. 4 is a schematic structural view of the main body of the present invention;
FIG. 5 is a schematic view of the assembly of the cylindrical piston, cone, centralizing ring and spring of the present invention;
FIG. 6 is an assembled view of a portion of the assembly of the present invention;
FIG. 7 is an enlarged partial schematic view of the piston seal of the inner seal cannula of the present invention;
FIG. 8A is a schematic representation of the invention in the open position with downhole fluid flowing through the upper half of the invention;
FIG. 8B is a schematic representation of the bottom half of the invention with downhole fluid flowing in the open position;
FIG. 9A is a schematic representation of the flow of downhole fluid through the upper half of the invention in the closed state of the invention;
FIG. 9B is a schematic representation of the invention in a closed position with downhole fluid flowing through the lower half of the invention;
reference numerals:
1-lower cover; 2-cone; 3-a body; 4-a spring; 5-a righting ring; 6-inner sealing cannula; 7-a central tube; 8, covering the cover; 9-a hydraulic control connecting port; 100-inner hole; 101-a first annular flow channel; 102-a tunnel; 103-a second annular flow passage; 11-a cylindrical piston; 11A-cylindrical piston seal; 12-a piston cavity; 13-sealing thread III; 14-a sucker rod; 15-feeding an oil pipe; 16-oil pipe descending; 17-tubing thread; 18-a pilot operated line; 19-downhole safety devices; 22-external conical surface; 25-an offshore platform; 26-tubing string; 27-a pump cylinder; 28-a packer; 29-well head; 31-inner conical surface; 62-a sealing piston; 62A-seal ring; 63-sealing thread II; 71-bell mouth; 81-sealing thread I.
Detailed Description
Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As shown in fig. 1, the present invention provides an application scenario of the annular valve plate type downhole safety device. When the offshore platform 25 adopts a sucker rod pump or a concentric pipe jet pump to produce oil, the annular valve plate type downhole safety device 19 provided by the invention is placed on an oil pipe column 26, and the corresponding well depth is generally required to be 30 meters lower than the sea bottom; wherein the sucker rod 14 or small oil pipe can pass through the annular valve plate type downhole safety device 19 provided by the invention and the packer 28 and finally can reach the pump barrel 27, the sucker rod pump or the concentric pipe jet pump can work normally, and the fluid can return to the well head 29; when an emergency occurs, the pressure supply of the hydraulic control pipeline 18 is cut off, so that the downhole safety device 19 provided by the invention is closed, the fluid in the tubing string 26 is prevented from accidentally returning upwards, and the safety of personnel and equipment on a platform can be effectively protected.
The technical scheme of the embodiment of the invention is further explained by the specific composition of the annular valve plate type downhole safety device.
The first embodiment is as follows:
As shown in fig. 2, an embodiment of the present invention provides an annular valve plate type downhole safety device, which includes a main body 3, an upper cover 8 located above the main body 3, and a lower cover 1 located below the main body 3.
The main body 3 is provided with a hollow channel and an inner sealing insertion pipe 6 penetrating through the hollow channel, the top end of the inner sealing insertion pipe 6 is used for being communicated with an oil pumping pipe 14, and the bottom end of the inner sealing insertion pipe 6 is used for being communicated with a pump cylinder 27 at the bottom end of an oil pipe column; the inner bore 100 provided in the inner sealed spigot 6 provides a separate transfer passage between the pump barrel 27 and the oil extraction tube 14 to ensure proper operation of the oil extraction tube 14.
the bottom end of the upper cover 8 can be sleeved on the top end outer edge of the main body 3, the top end of the upper cover 8 can be communicated with an oil feeding pipe 15, the upper cover 8 can be internally provided with a central pipe 7, an annular cavity between the upper cover 8 and the central pipe 7 is a second annular flow passage 103, and the second annular flow passage 103 is an oil and gas conveying passage of the sucker rod pump. The bottom end of the central tube 7 is connected with the inner edge of the top end of the main body 3, and the top end of the inner sealing insertion tube 6 can penetrate through the inside of the central tube 7 and is communicated with the oil pumping tube; and a sealing surface is arranged between the central pipe 7 and the inner sealing insertion pipe 6 so as to effectively prevent produced oil gas of the sucker rod pump from going upwards through an annular cavity between the central pipe 7 and the inner sealing insertion pipe 6.
The top end of the lower cover 1 can be sleeved on the outer edge of the bottom end of the main body 3, the bottom end of the lower cover 1 can be communicated with a lower oil pipe 16, and an annular cavity between the lower cover 1 and the inner sealing insertion pipe 6 is an oil-gas conveying channel of the sucker-rod pump. A plurality of pore passages 102 are formed in the main body 3, and the top ends of the pore passages 102 are communicated with a second annular flow passage 103 formed between the central tube 7 and the upper cover 8; the lower cover 1 is provided with a plugging mechanism for plugging the bottom end of the pore passage 102.
in the specific operation, when the plugging mechanism is in an open state, oil gas can smoothly enter the bottom end of the pore channel 102 from the annular cavity between the lower cover 1 and the inner sealing insertion tube 6 and flow into the second annular flow channel 103 through the top end of the pore channel 102, and then normal oil gas conveying operation of the sucker rod pump can be realized. When the plugging mechanism is in a plugging state, the bottom end of the pore passage 102 is in a plugging state, and oil gas can stay in an annular cavity between the lower cover 1 and the inner sealing insertion tube 6, so that the oil gas return accident under an emergency condition can be effectively avoided, and the safety of platform personnel and equipment can be effectively protected.
Referring to fig. 3, 4 and 5, in this embodiment, the plugging mechanism includes a cone 2 located inside the lower cover 1, a top end surface of the cone 2 is an external conical surface 22, a bottom end inner edge of the main body 3 is an internal conical surface 31, and conical surfaces between the external conical surface 22 and the internal conical surface 31 cooperate to form a conical surface sealing structure; the bottom end of the duct 102 is located in the inner conical surface 31, and the conical surface sealing mechanism can effectively seal the bottom end of the duct 102; the outer conical surface 22 and the inner conical surface 31 are preferably smooth metal conical surfaces to form a corresponding metal conical surface sealing structure, so that the stability of the conical surface sealing structure can be effectively ensured.
Further, the plugging mechanism further comprises a spring 4 and a righting ring 5 sleeved outside the cone 2, an annular step surface is arranged inside the lower cover 1, the top end of the spring 4 is in contact with the righting ring 5, and the bottom end of the spring 4 is in contact with the annular step surface of the lower cover 1; the bottom end of the cone 2 can be inserted into the intermediate passage of the annular step surface. The initial state of the spring 4 may be a compressed state, that is, the top end of the spring 4 pushes up the centralizing ring 5 and the cone 2, and firmly abuts the outer conical surface 22 of the cone 2 against the inner conical surface 31, and the duct 102 is in a blocked state. When the centralizing ring 5 is under the action of external pressure, the spring 4 positioned below the centralizing ring 5 is compressed, meanwhile, the bottom end of the cone 2 is continuously inserted downwards into the middle channel of the annular step surface, the outer conical surface 22 of the cone 2 is separated from the inner conical surface 31, and the pore channel 102 can be communicated.
In this embodiment, the plugging mechanism is further connected to a control mechanism, and the control mechanism is configured to control switching between an open state and a plugging state of the plugging mechanism. The control mechanism comprises a piston cavity 12 arranged on the main body 3 and a columnar piston 11 arranged in the piston cavity 12, a columnar piston seal 11A is arranged at the top end of the columnar piston 11, the bottom end of the columnar piston is connected with the righting ring 5, pressure change at the top end of the columnar piston can be converted into up-down movement of the columnar piston, and then the righting ring 5 can be driven to perform corresponding up-down movement operation, so that the opening or the effective control of the plugging state of the plugging mechanism can be finally realized.
As shown in fig. 6, 1-2 piston cavities 12 are formed in the main body 3, and a key groove is formed at the bottom end of the columnar piston 11; the key groove and the righting ring 5 can realize convenient connection operation; the top end of the piston cavity 12 can be provided with a hydraulic control connecting port 9, and the hydraulic control connecting port 9 can be connected with a hydraulic control pipeline 18; by the control operation of the hydraulic control line 18, the pressure control operation in the piston chamber can be realized, and further the up-and-down movement control operation of the columnar piston 11 can be realized.
as shown in fig. 7, a sealing piston 62 is sleeved outside the inner sealing insertion tube 6, an annular sealing groove is formed in a side wall of the sealing piston 62, and a sealing ring 62A is arranged in the annular sealing groove; the sealing ring 62A can form effective sealing of the first annular flow passage 101 formed by the inner sealing insertion tube 6 and the central tube 7, and can effectively prevent produced oil gas of the sucker rod pump from going upwards through an annular cavity between the central tube 7 and the inner sealing insertion tube 6. In this embodiment, the top end of the central tube 7 is provided with a flare 71, and the flare 71 is provided to facilitate the insertion operation of the sealing piston 62.
in this embodiment, 1-8 holes 102 are uniformly distributed on the main body 3, and the axis of the hole 102 is preferably parallel to the axis of the main body 3.
In the embodiment, the top end of the upper cover 8 is connected with the upper oil pipe 15 through an oil pipe thread 17, and the bottom end of the upper cover 8 is connected with the top end of the main body 3 through a sealing thread I81; the bottom end of the central tube 7 is connected with the top end of the main body 3 through a sealing thread II 63; the top end of the lower cover 1 is connected with the bottom end of the main body 3 through a sealing thread III 13, the bottom end of the lower cover 1 is also connected with a lower oil pipe 16 through an oil pipe thread 17, and the inner sealing insertion pipe 6 is connected with the sucker rod 14 through a connecting structure of the oil pipe thread.
The working process of the annular valve plate type underground safety device provided by the invention is as follows:
When a sucker-rod pump or a concentric pipe jet pump of an offshore platform is normally produced, as shown in fig. 8A to 8B, the cylindrical piston 11 in the main body 3 generates piston thrust under the pressure supply of the hydraulic control pipeline 18 to push the cone 2 and compress the spring 4 to move downwards, at this time, the annular outer conical surface 22 at the top end of the cone 2 is separated from the annular inner conical surface 31 at the bottom end of the main body 3, and the pore passage 102 is in a conducting state; due to the sealing action of the sealing piston 62, the oil gas flow cannot continue to flow upwards through the first annular flow passage 101 formed by the inner sealing insertion tube 6 and the central tube 7, only flows to the second annular flow passage 103 through the pore passage 102 on the main body 3, continues to flow upwards from the second annular flow passage 103, and finally reaches the wellhead.
When the offshore platform encounters an emergency, the pressure supply of the hydraulic control pipeline 18 is cut off, the downhole safety device 19 provided by the invention is closed, at the moment, the fluid in the valve body flows as follows, and as shown in fig. 9A-9B, the oil-gas flow cannot continue to flow upwards through the first annular flow channel 101 formed by the inner sealing insertion pipe 6 and the central pipe 7 due to the sealing effect of the inner sealing insertion pipe piston 62; meanwhile, as the hydraulic control pipeline 18 is cut off, the columnar piston 11 in the main body 3 loses the piston thrust, the cone 2 moves upwards under the resilience force of the spring 4 until the annular outer conical surface 22 at the top end of the cone 2 is attached to the annular inner conical surface 31 at the bottom end of the main body 3, so that the conical surface is sealed by metal, at the moment, the pore channel 102 is in a blocking state, and oil-gas flow cannot flow upwards through the pore channel 102 on the main body 3; therefore, at this time, the oil gas flow channel in the oil pipe string 26 is completely cut off, and oil gas fluid cannot flow upwards, so that the aims of protecting platform equipment, personnel safety and marine environment are fulfilled.
It should be noted that the annular valve plate type downhole safety device 19 provided by the present invention is in an open state or a closed state, and does not affect the normal operation of the sucker rod pump or the concentric tube jet pump.
The annular valve plate type downhole safety device provided by the invention can be applied to a rod pump or a concentric tube jet pump, and can avoid the problem that the conventional downhole safety device cannot be used on the rod pump or the concentric tube jet pump; in addition, the annular valve plate type underground safety device provided by the invention allows a sucker rod or a small oil pipe to be placed in the valve body and allows the sucker rod to reciprocate up and down, so that underground fluid is pumped to the ground, namely the normal production of the sucker rod cannot be influenced by the operation of the safety device; in addition, when an emergency occurs, the underground safety device is closed in time by cutting off the pressure of the ground hydraulic control pipeline, so that underground fluid is prevented from returning upwards, and offshore platform equipment, safety and marine environment are protected.
In the description of the present application, the terms "disposed," "connected," "fixed," and the like are used in a broad sense, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
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 application. 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.
it should be understood by those skilled in the art that the embodiments of the present invention are described above, but the descriptions are only for the purpose of facilitating understanding of the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the embodiments of the invention as defined by the appended claims.
Claims (8)
1. an annular valve plate type downhole safety device is characterized by comprising a main body, an upper cover positioned above the main body and a lower cover positioned below the main body;
The main body is provided with a hollow channel and an inner sealing insertion pipe penetrating through the hollow channel, the top end of the inner sealing insertion pipe is used for being communicated with an oil pumping pipe, and the bottom end of the inner sealing insertion pipe is used for being communicated with a pump cylinder at the bottom end of an oil pipe column; an inner hole arranged in the inner sealing insertion pipe forms an independent transmission channel between the pump barrel and the oil pumping pipe;
a central pipe sleeved outside the inner sealing insertion pipe is arranged in the upper cover, and an annular cavity between the upper cover and the central pipe forms a second annular flow passage for oil and gas conveying of the sucker rod pump; the main body is provided with a plurality of pore channels, the top ends of the pore channels are communicated with the second annular flow channel, and a plugging mechanism for plugging the bottom ends of the pore channels is arranged in the lower cover; the plugging mechanism is connected with a control mechanism, and the control mechanism is used for controlling the switching between the opening state and the plugging state of the plugging mechanism;
the outside cover of interior seal intubate is equipped with sealed piston, and sealed piston's lateral wall is provided with cyclic annular seal groove, is provided with the sealing washer in the cyclic annular seal groove, the sealing washer is used for constituting sealed face between interior seal intubate and the center tube.
2. An annular valve plate downhole safety device according to claim 1,
The plugging mechanism comprises a cone positioned in the lower cover, the top end face of the cone is an external conical surface, the bottom inner edge of the main body is an internal conical surface, the bottom end of the pore passage is positioned in the internal conical surface, and conical surfaces between the external conical surface and the internal conical surface are matched to form a conical surface sealing structure.
3. the annular valve plate downhole safety device of claim 2,
The plugging mechanism further comprises a spring and a centering ring sleeved on the outer side of the cone, an annular step surface is arranged in the lower cover, the top end of the spring is in contact with the centering ring, the bottom end of the spring is in contact with the annular step surface of the lower cover, and the bottom end of the cone is inserted into a middle channel of the annular step surface.
4. the annular valve plate downhole safety device of claim 3,
The control mechanism comprises a piston cavity arranged on the main body and a columnar piston arranged in the piston cavity, the bottom end of the columnar piston is connected with the righting ring, and a hydraulic control connecting port communicated with a hydraulic control pipeline is arranged at the top end of the piston cavity.
5. The annular valve plate downhole safety device of any of claims 1-4,
The top end of the upper cover is communicated with an oil feeding pipe, and the bottom end of the upper cover is sleeved on the outer edge of the top end of the main body; the top end of the lower cover is sleeved on the outer edge of the bottom end of the main body, and the bottom end of the lower cover is communicated with a lower oil pipe.
6. an annular valve plate downhole safety device according to claim 5,
The upper cover and the upper oil pipe, and the lower cover and the lower oil pipe are in threaded connection through oil pipes; and the upper cover and the main body and the lower cover and the main body are in sealed threaded connection.
7. The annular valve plate downhole safety device of any of claims 1-4,
The bottom end of the central tube is connected with the inner edge of the top end of the main body, the top end of the inner sealing insertion tube penetrates through the inside of the central tube and is communicated with the oil pumping tube, and a sealing surface is arranged between the inner sealing insertion tube and the central tube.
8. An annular valve plate downhole safety device according to claim 4,
And the top end of the columnar piston is provided with a columnar piston seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710822108.2A CN107829710B (en) | 2017-09-12 | 2017-09-12 | Annular valve plate type underground safety device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710822108.2A CN107829710B (en) | 2017-09-12 | 2017-09-12 | Annular valve plate type underground safety device |
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| CN107829710A CN107829710A (en) | 2018-03-23 |
| CN107829710B true CN107829710B (en) | 2019-12-06 |
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|---|---|---|---|---|
| CN108086947B (en) * | 2017-11-27 | 2020-04-17 | 中国海洋石油集团有限公司 | Downhole safety tool for concentric tubing strings |
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| CN107829710A (en) | 2018-03-23 |
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