CN112761568A - Packer - Google Patents
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- CN112761568A CN112761568A CN202011629496.0A CN202011629496A CN112761568A CN 112761568 A CN112761568 A CN 112761568A CN 202011629496 A CN202011629496 A CN 202011629496A CN 112761568 A CN112761568 A CN 112761568A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention belongs to the field of oilfield development tools, and discloses a packer which comprises a body, a rubber sleeve, a sliding sleeve and a control valve core; the rubber cylinder is sleeved outside the body and can perform radial reciprocating expansion and retraction relative to the body; the inner part of the body is provided with a medium containing cavity, a sliding sleeve hole, a valve core hole, a first oil path and a second oil path, the medium containing cavity is used for containing a medium for driving the rubber cylinder to seat, the sliding sleeve hole is axially communicated with the valve core hole, the sliding sleeve is positioned in the sliding sleeve hole and can move in a reciprocating manner, the control valve core is positioned in the valve core hole and can move in a reciprocating manner, one end of the first oil path is communicated with the valve core hole, the other end of the first oil path is communicated with a gap between the body and the rubber cylinder, one end of the second oil path is communicated with the; the sliding sleeve is selectively connected with the control valve core and can drive the control valve core to reciprocate so as to control the on-off relation of the first oil path and the second oil path through the valve core hole. The packer is simple and convenient to operate, and can realize repeated setting and unsealing operations.
Description
Technical Field
The invention belongs to the field of oilfield development tools, and particularly relates to a packer.
Background
The packer is a downhole tool having an elastic sealing element, which can seal the annular space between the pipe strings with various sizes and between the well bores and between the pipe strings, isolate the production zone, control production (injection) fluid and protect the casing, and thus is widely used in oil wells, gas wells, well completions and the like in the oil industry.
At present, the existing packer has various types and different functions, and almost has larger packing capacity. However, the existing packer has the following problems in the working process:
1. the steps of controlling the sealing and unsealing are complicated, the operation is troublesome, the workload is large, and the working time is long;
2. packers cannot be set multiple times in a well, for example hydraulic packers use hydraulic cylinders to squeeze a sealing material to achieve setting. During setting, the sealing material expands, and when unset, the lifting column unlocks the locking ring, wherein before setting, to prevent setting halfway, pins are required for fixing, and when setting, the pins are cut short, which results in irreversible operation.
Disclosure of Invention
In order to improve the convenience of setting and unsealing operations and realize multiple setting and unsealing operations, the invention provides a packer with a brand-new structure. The packer comprises a body, a rubber sleeve, a sliding sleeve and a control valve core; the rubber cylinder is sleeved outside the body, two ends of the rubber cylinder are respectively and hermetically fixed with the outer surfaces of two ends of the body, and the middle section of the rubber cylinder can perform radial reciprocating expansion and retraction relative to the body; the rubber cylinder sealing device is characterized in that a medium containing cavity, a sliding sleeve hole, a valve core hole, a first oil path and a second oil path are arranged in the rubber cylinder sealing device, the medium containing cavity is used for containing a medium for driving the rubber cylinder to seal and a high-pressure medium for releasing, the sliding sleeve hole is axially communicated with the valve core hole, the sliding sleeve is located in the sliding sleeve hole and can move in a reciprocating manner, the control valve core is located in the valve core hole and can move in a reciprocating manner, one end of the first oil path is communicated with the valve core hole, the other end of the first oil path is communicated with a gap between the rubber cylinder and the body, one end of the second oil path is communicated with the medium containing cavity, and the other; the sliding sleeve is selectively connected with the control valve core and can drive the control valve core to reciprocate so as to control the on-off relationship of the first oil path and the second oil path through the valve core hole.
Preferably, the packer is also provided with a driving piston, a control assembly, a sliding sleeve elastic element and a valve core elastic element; the driving piston is located at one end in the valve core hole and can axially reciprocate, the sliding sleeve hole is formed in the driving piston, the sliding sleeve elastic piece is located in the sliding sleeve hole and is in contact with the sliding sleeve so as to drive the sliding sleeve to move towards the valve core hole relative to the driving piston, the control assembly is located between the driving piston and the sliding sleeve so as to limit the movement of the sliding sleeve relative to the driving piston, the valve core elastic piece is located in the valve core hole, one end of the valve core elastic piece is in contact with the lower end face of the driving piston, and the other end of the valve core elastic piece is in contact with the upper end face of the control valve core so as to drive the control valve core to axially move relative to the driving piston.
Further preferably, the control assembly comprises a control piston, a piston hole, a control elastic member and a control groove; the piston hole is formed in the driving piston, the control elastic part is located in the piston hole, the control piston is located in the piston hole and is in contact with the control elastic part, the control piston can extend into the sliding sleeve hole under the driving of the control elastic part, and the control groove is formed in the outer surface of the sliding sleeve; when the sliding sleeve overcomes the action force of the sliding sleeve elastic part and is positioned in the sliding sleeve hole, the control piston extends into the control groove, so that the sliding sleeve and the control valve core are axially connected; when the control piston is recovered into the piston hole, the sliding sleeve extends to the valve core hole under the action force of the sliding sleeve elastic part, so that the sliding sleeve is disconnected with the control valve core.
Further preferably, a control oil path is arranged on the driving piston; one end of the control oil way is communicated with the valve core hole, and the other end of the control oil way extends into the piston hole so as to drive the control piston to overcome the piston elastic part to recover and move by high-pressure medium introduced into the valve core hole.
Further preferably, an auxiliary oil path is arranged on the driving piston; one end of the auxiliary oil path is communicated with an external control medium, and the other end of the auxiliary oil path extends into the piston hole so as to assist the piston elastic piece to drive the control piston to extend into the piston groove.
Preferably, the packer is provided with a deblocking oil path and a piston elastic piece; one end of the deblocking oil path is communicated with an external control medium, the other end of the deblocking oil path extends to the upper end face of the driving piston, the piston elastic piece is located in the valve core hole, one end of the piston elastic piece is in contact with the lower end face of the driving piston, and the other end of the piston elastic piece is in contact with the body.
Preferably, the packer is also provided with a hook; the hook is rotationally connected with the driving piston, one end of the hook is rotationally connected with the sliding sleeve, and the other end of the hook is axially and selectively connected with the control valve core; when the sliding sleeve moves relative to the control valve core in a direction close to the control valve core, the sliding sleeve drives the hook to rotate, so that the hook is disconnected from the control valve core; when the sliding sleeve moves relative to the control valve core in the direction far away from the control valve core, the sliding sleeve drives the hook to rotate, so that the hook is connected with the control valve core.
Preferably, a balance oil way is arranged on the sliding sleeve; one end of the balance oil way is communicated with the valve core hole, and the other end of the balance oil way extends to the containing cavity where the sliding sleeve elastic part is located.
Preferably, a third oil way is arranged on the control valve core; the third oil passage communicates a portion of the spool hole that communicates with the first oil passage with a portion of the spool hole that communicates with the second oil passage.
Preferably, the rubber cylinder is fixedly connected with the body through the upper sleeve and the lower sleeve, and the upper sleeve and the lower sleeve are connected with the rubber cylinder in a trapezoidal buckle mode.
Compared with the packer with the existing structure, the packer has the following beneficial technical effects:
1. in the packer, the control valve core and the sliding sleeve which can move in a reciprocating mode are arranged in the body, the first oil way and the second oil way are arranged on the body, the first oil way is communicated with a gap between the rubber sleeve and the body, and the second oil way is communicated with the medium containing cavity. At the moment, the selective connection between the sliding sleeve and the control valve core in the reciprocating movement process is utilized, so that the control valve core is accurately driven to carry out axial reciprocating movement, the on-off control of the control valve core on the first oil path and the second oil path is achieved, and the reciprocating expansion and retraction control of the rubber cylinder is realized by matching with the change of the medium pressure in the medium accommodating cavity, so that the setting and unsealing operations are realized. Like this, not only can realize the repeated operation many times of seat seal and deblocking, moreover only need the motion of control sliding sleeve and cooperate the medium to hold the change of medium pressure in the chamber can to greatly reduced control's complexity improves the convenience of operation.
2. In the invention, the drive piston is driven and controlled by the aid of the introduced deblocking medium and the piston elastic piece through the deblocking oil path, and the control valve core is driven to move through the sliding sleeve and the hook, so that deblocking operation is realized. Therefore, the setting and unsealing media can be independently controlled, so that the setting and unsealing operation processes can be clearly distinguished, and the reliability and effectiveness of repeated setting and unsealing operations are improved.
3. In the invention, the sliding sleeve is arranged on the driving piston, and the driving piston is provided with a hook which is rotationally connected, so that one end of the hook is rotationally connected with the sliding sleeve, and the other end of the hook is selectively and axially connected with the control valve core. At the moment, in the process that the sliding sleeve axially reciprocates relative to the driving piston, the connection relation between the hook and the control valve core can be directly controlled, and the sliding sleeve controls the reciprocating motion of the control valve core. Therefore, the reciprocating movement of the control valve core can be realized completely through controlling the medium pressure in the medium containing cavity and the unsealing oil path, so that repeated operations of setting and unsealing operations can be completed, and the convenience of the setting and unsealing operations is improved.
Drawings
FIG. 1 is a schematic structural diagram of a packer in an unset state according to the present embodiment;
fig. 2 is a schematic structural diagram of the packer of the present embodiment in a set state.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
Referring to fig. 1 and 2, the packer of the present embodiment includes a body 1, a packing element 2, a sliding sleeve 3 and a control valve core 4. Wherein, the outside at body 1 is established to packing element 2 cover to the both ends of packing element 2 form sealed fixed with the both ends surface of body 1 respectively, and the interlude of packing element 2 then can carry out radial reciprocal inflation and retraction for body 1, thereby forms seat and deblocking. The inner part of the body 1 is provided with a medium containing cavity 111, a sliding sleeve hole 112, a valve core hole 113, a first oil path 121 and a second oil path 122, the medium containing cavity 111 is used for containing a medium for driving the rubber cylinder 2 to seat, the sliding sleeve hole 112 and the valve core hole 113 are axially communicated, the sliding sleeve 3 is positioned in the sliding sleeve hole 112 and can axially reciprocate, the control valve core 4 is positioned in the valve core hole 113 and can axially reciprocate, one end of the first oil path 121 is communicated with the valve core hole 113, the other end of the first oil path is communicated with a gap between the body 1 and the rubber cylinder 2, one end of the second oil path 122 is communicated with the medium containing cavity 111, and the other end of the second oil path is connected with the valve. The sliding sleeve 3 is movably connected with the control valve core 4, and can drive the control valve core 4 to perform axial synchronous reciprocating movement so as to control the on-off relationship of the first oil path 121 and the second oil path 122 through the valve core hole 113.
When the medium containing cavity 111 is filled with high-pressure medium, the control valve core 4 and the sliding sleeve 3 keep a connection relation, and the control valve core 4 moves to a position where the first oil path 121 and the second oil path 122 are communicated through the valve core hole 113 along with the sliding sleeve 3, the high-pressure medium in the medium containing cavity 111 can sequentially flow to a gap between the rubber cylinder 2 and the body 1 through the second oil path 122, the valve core hole 113 and the first oil path 121 to drive the rubber cylinder 2 to radially expand, after the rubber cylinder 2 expands to a position, the sliding sleeve 3 is disconnected from the control valve core 4, so that the control valve core 4 moves to a position where the first oil path 121 and the second oil path 122 are disconnected, the high-pressure medium is sealed between the rubber cylinder 2 and the body 1, and seat sealing is completed.
When the medium containing cavity 111 is communicated with a low-pressure medium, the sliding sleeve 3 is connected with the control valve core 4 again, and the control valve core 4 is driven to the position where the first oil path 121 and the second oil path 122 are communicated through the valve core hole 113, a high-pressure medium between the rubber cylinder 2 and the body 1 flows into the medium containing cavity 111 through the first oil path 121, the valve core hole 113 and the second oil path 122 to release pressure, so that the rubber cylinder 2 retracts, and unsealing is completed.
As shown in fig. 1 and 2, the packer of this embodiment further includes a driving piston 5, a control assembly 6, a sliding sleeve elastic member 71 and a valve core elastic member 72. The driving piston 5 is located at one end in the valve core hole 113 and can perform axial reciprocating movement, the sliding sleeve hole 112 is directly formed on the driving piston 5 in the axial direction, and the sliding sleeve elastic member 71 is a helical spring and is located in the sliding sleeve hole 112 to keep contact with the sliding sleeve 3 so as to drive the sliding sleeve 3 to move towards the direction of the valve core hole 113 relative to the driving piston 5. The control assembly 6 is located between the drive piston 5 and the sliding sleeve 3 to limit the axial movement of the sliding sleeve 3 relative to the drive piston 5, i.e. to control whether the sliding sleeve 3 and the drive piston 5 remain in an axially fixed connection. The spool elastic member 72 is also a coil spring and is located in the spool hole 113, one end of which is held in contact with the lower end surface of the drive piston 5 and the other end of which is held in contact with the upper end surface of the control spool 4 to drive the control spool 4 to move axially relative to the drive piston 5.
At this time, under the condition that the sliding sleeve is in contact connection with the control valve core, the control valve core can move relative to the driving piston and keep at a position for disconnecting the first oil path and the second oil path under the action force of the control elastic piece. On the contrary, when the sliding sleeve is connected with the control valve core and the sliding sleeve is fixedly connected with the driving piston in the axial direction through the control assembly, the driving piston can move the control valve core to the position where the first oil path is communicated with the second oil path through the sliding sleeve. Therefore, the control valve core can be driven to axially reciprocate by controlling the connection relation between the driving piston and the sliding sleeve and the reciprocating movement of the driving piston along the axial direction, and further the communication relation between the first oil path and the second oil path is controlled.
In the present embodiment, the control assembly 6 includes a control piston 61, a piston bore 62, a control elastic member 63, and a control groove 64. Wherein, the piston hole 62 is opened on the driving piston 5 along the radial direction, the control elastic member 63 is a thread spring and is positioned in the piston hole 62, the control piston 61 is positioned in the piston hole 62 and is kept in contact with the control elastic member 63, and can extend into the sliding sleeve hole 112 under the driving of the control elastic member 63, and the control groove 64 is opened on the outer surface of the sliding sleeve 3 along the circumferential direction.
When the sliding sleeve 3 overcomes the acting force of the sliding sleeve elastic member 71 and is retracted into the sliding sleeve hole 112, the control piston 61 extends into the control groove 64 under the acting force of the control elastic member 63, so that the sliding sleeve 3 and the control piston 61 form an axial connection, and simultaneously the sliding sleeve 3 and the control valve core 4 form an axial connection. When the control piston 61 is retracted into the piston hole 62 against the force of the control elastic member 63 to release the axial connection with the sliding sleeve 3, the sliding sleeve 3 extends out of the sliding sleeve hole 112 by the sliding sleeve elastic member 71 to release the axial connection with the control valve core 4.
At this moment, the position of the sliding sleeve and the connection relation between the sliding sleeve and the control valve core can be controlled by overcoming the control elastic piece and the sliding sleeve elastic piece, namely, the control valve core can be controlled to control the on-off between the first oil path and the second oil path by adjusting the acting force of the control elastic piece and the sliding sleeve elastic piece, namely, the control on the setting medium pressure and the unsetting medium pressure is achieved. Similarly, in other embodiments, other structural style can also be adopted to the control assembly, for example choose for use the pole and directly carry out axial fixity with the sliding sleeve and be connected to can realize the action of remote control pole, thereby reach the drive sliding sleeve and for drive piston axial reciprocating motion, and then the axial displacement of control case.
As shown in fig. 1 and 2, the drive piston 5 of the present embodiment is provided with a control oil passage 51. One end of the control oil path 51 is communicated with the valve core hole 113, and the other end extends into the piston hole 62, so as to introduce the high-pressure medium in the valve core hole 113 and drive the control piston 61 to perform the recovery movement against the control elastic member 63.
At the moment, the control piston can directly reciprocate under the interaction force between the high-pressure medium and the control elastic part in the medium containing cavity, so that the movement of the sliding sleeve relative to the driving piston is controlled, and the control of the control valve core is further achieved. Therefore, the action of the control valve core can be directly controlled by the pressure of the high-pressure medium filled in the subsequent medium containing cavity by presetting the pretightening force of the control elastic piece, so that the automation of control is realized, and the convenience of the operation of the packer is improved.
As shown in fig. 1 and fig. 2, in the packer of the present embodiment, a deblocking oil path 8 and a piston elastic member 73 are further provided. One end of the unsealing oil path 8 is communicated with an external control medium, the other end of the unsealing oil path extends to the upper end face of the driving piston 5, the piston elastic piece 73 is arranged in the valve core hole 113 along the axial direction by a thread spring, one end of the piston elastic piece is contacted with the lower end face of the driving piston 5, and the other end of the piston elastic piece is contacted with the body 1.
At the moment, an external control medium is led to the upper end face of the driving piston through the deblocking oil path, so that an acting force moving downwards is formed on the driving piston, when the pressure rises to overcome the acting force of the piston elastic piece, the driving piston can move towards the direction of the control valve core and drives the control piston to move towards the direction of the control valve core, so that the control piston and the control valve core form a connection relation and the control piston and the driving piston form an axial connection, then the driving piston can drive the control valve core to move through the sliding sleeve under the action of restoring force of the piston elastic piece by reducing the pressure of the external control medium, and further the first oil path is communicated with the second oil path, and the purpose of deblocking is achieved. Similarly, in other embodiments, other modes can be selected to control the reciprocating movement of the driving piston according to the use working condition, and even an electric pole or an air cylinder is directly selected to control the axial reciprocating movement of the driving piston.
In addition, in the case of a motion control of the drive piston with an external control medium, an auxiliary oil path 52 is provided in the drive piston 5. One end of the auxiliary oil path 52 is communicated with an external control medium through the unsealing oil path 8, and the other end extends into the piston hole 62, so that the auxiliary control elastic piece 63 drives the control piston 61 to extend into and be kept in the piston groove 64, and the stability and reliability of the axial connection between the control piston 61 and the driving piston 5 are improved.
As shown in fig. 1 and 2, a hook 9 is further provided in the packer of this embodiment. The hook 9 is of an arc-shaped structure and is rotatably connected with the driving piston 5, one end of the hook 9 is rotatably connected with the sliding sleeve 3, and the other end of the hook is axially and selectively connected with the control valve core 4. When the sliding sleeve 3 is connected with the control valve core 4 through the hook 9 and further moves towards the direction close to the control valve core 4, the sliding sleeve 3 drives the hook 9 to rotate, so that the hook 9 is disconnected with the control valve core 4. On the contrary, when the sliding sleeve 3 and the control valve core 4 are in a close and non-connection state and move relatively in a direction away from the control valve core 4, the sliding sleeve 3 drives the hook 9 to rotate reversely, so that the hook 9 and the control valve core 4 are connected again.
Wherein, be equipped with a boss in the control case tip of this embodiment and be used for linking up with the couple each other, like this, at the sliding sleeve for drive piston reciprocating motion's in-process, rotate through driving the couple, make the tip of couple and the boss of control case link up with being connected to form the selection connection control between sliding sleeve and the control case.
As shown in fig. 1 and 2, a balance oil path 31 is further provided on the sliding sleeve 3. One end of the balance oil path 31 is communicated with the valve core hole 113, and the other end extends to the part of the sliding sleeve elastic part 71 in the sliding sleeve hole 112, so that the two ends of the sliding sleeve 3 are simultaneously kept in contact with the medium in the valve core hole 113, and the sliding sleeve 3 is precisely controlled by the sliding valve elastic part 71 to reciprocate, and the sliding sleeve 3 and the control valve core 4 are precisely controlled.
In addition, in this example, the control valve core 4 is of a cylindrical structure, the first oil path 121 and the second oil path 122 are respectively the inner side and the outer side of the control valve core 4, and the first oil path 121 is blocked in a manner of forming a line seal between the control valve core 4 and the body 1, so as to cut off the first oil path 121 and the second oil path 122. Therefore, a third oil passage 123 is provided in the control spool 4 so as to extend radially through the wall thickness thereof, and the portion of the spool bore 113 communicating with the first oil passage 121 and the portion of the spool bore 113 communicating with the second oil passage 122 are communicated through the third oil passage 123. Like this, under the condition that sliding sleeve and control valve core form axial connection, also can guarantee that the passageway that forms through the case hole between first oil circuit and the second oil circuit has sufficient through-flow area to guarantee the medium and hold the fast flow of medium between chamber and packing element and the body, improve the reaction rate of setting and deblocking, obtain more setting and deblocking effect.
In addition, as shown in fig. 1 and fig. 2, in this embodiment, the rubber tube 2 is fixedly connected to the main body 1 by the upper jacket 101 and the lower jacket 102, and the upper jacket 101, the lower jacket 102 and the rubber tube 2 are connected by a trapezoidal buckle, so as to improve the sealing effect on the rubber tube 2 and prevent the medium leakage during the setting and unsealing processes.
As shown in fig. 1 and fig. 2, when the packer of this embodiment is used for setting and unsetting operation in a well, the two ends of the medium containing cavity 111 in the body 1 are connected to the medium pipeline for controlling setting, the medium for setting is drained to the medium containing cavity 111, the unsetting oil path 8 is connected to the external pipeline for controlling unsetting, and then the whole packer is placed to the setting position in the well, and then setting and unsetting operation are performed, and the specific process is as follows:
in the process of putting the packer to a required position in the well, the sliding sleeve 3 is kept connected with the control valve core 4 through the hook 9, the sliding sleeve 3 overcomes the sliding sleeve elastic piece 71 and is recovered into the sliding sleeve hole 112, the control piston 61 extends into the control groove 64 to keep the sliding sleeve 3 and the driving piston 4 in an axial fixed connection, and therefore the control valve core 4 overcomes the acting force of the valve core elastic piece 72 and is kept at a position where the first oil path 121 and the second oil path 122 are communicated through the valve core hole 113.
When the seat sealing operation is performed, the high-pressure medium in the medium accommodating cavity 111 sequentially passes through the second oil path 122, the valve core hole 113 and the first oil path 121 to flow to a gap position between the rubber cylinder 2 and the body 1, and the rubber cylinder 2 is gradually driven to expand outwards relative to the body 1 along with the pressure rise of the high-pressure medium. When the pressure of the high-pressure medium rises, and the high-pressure medium flowing into the piston bore 62 through the control oil passage 51 can drive the control piston 61 to be recovered into the piston bore 62 against the urging force of the control elastic member 63, when the control piston 61 loses the connection with the control groove 64, the sliding sleeve 3 starts to extend to the valve core hole 113 relative to the driving piston 5 under the driving action force of the sliding sleeve elastic piece 71, thereby driving the hook 9 to rotate, enabling the hook 9 to be disconnected from the control valve core 4, simultaneously the control valve core 4 starts to axially move under the driving acting force of the valve core elastic part 72, and finally moves to a position where the first oil passage 121 is blocked, cuts off the communication between the first oil passage 121 and the second oil passage 122, thereby sealing the high-pressure medium between the rubber cylinder 2 and the body 1 and keeping the expansion state of the rubber cylinder 2 to finish the setting operation. After that, the high-pressure medium in the medium container 11 can be decompressed, so that the control valve core 4 can be kept in an effective stable seat under the action of the valve core elastic piece 72.
When carrying out the deblocking operation, the upper end of drive piston 5 that will external deblocking medium introduce through deblocking oil circuit 8 in the first stage to overcome piston elastic component 73 drive piston 5 and carry out axial displacement, thereby drive sliding sleeve 3 and remove to the direction that is close to control valve core 4. When the sliding sleeve 3 contacts the control valve core 4 and the unsealing medium drives the driving piston 5 to overcome the piston elastic piece 73 and continue to move, the sliding sleeve 3 overcomes the sliding sleeve elastic piece 71 and recovers to the sliding sleeve hole 112 relative to the driving piston 5 by taking the control valve core 4 as a reference, so as to drive the hook 9 to rotate reversely, and the hook 9 is rotated to the position of reconnecting with the control valve core 4. At the same time, the control groove 64 moves with the sliding sleeve 3 to a position aligned with the control piston 61, so that the control piston 61 re-extends into the control groove 64 under the action of the control elastic member 63, and an axially fixed connection is formed between the control piston 61 and the driving piston 5. Furthermore, the auxiliary oil passage 52 leads the high-pressure deblocking medium at the upper end of the drive piston 5 to the piston bore portion in which the control elastic member 63 is located, so that the auxiliary control elastic member 63 stabilizes the control piston 61 in a position in which it is connected to the piston groove 64. In the second stage, the unsealing medium in the unsealing oil path 8 is decompressed, so that the driving piston 5 starts to move upwards under the restoring action force of the piston elastic piece 73, the control valve core 4 is driven to move upwards through the sliding sleeve 3 and the hook 9, the control valve core 4 is enabled to unseal the first oil path 121, and then the high-pressure medium between the rubber cylinder 2 and the body 1 is released into the medium accommodating cavity 11 through the first oil path 121, the valve core hole 113 and the second oil path 122, so that the rubber cylinder 2 loses the effect of the high-pressure medium and retracts, and the unsealing operation is completed.
The process is repeated in sequence, and multiple setting and unsetting operations of the packer can be realized by controlling the medium pressure change in the medium containing cavity and the unsetting oil way, so that repeatable multiple setting operations are realized. In the process, the seat sealing pressure and the unsealing pressure can be changed by adjusting the pretightening force of the control elastic piece, the valve core elastic piece and the piston elastic piece, so that the accurate and flexible control of the seat sealing and unsealing operation is improved.
Claims (10)
1. A packer is characterized by comprising a body, a rubber barrel, a sliding sleeve and a control valve core; the rubber cylinder is sleeved outside the body, two ends of the rubber cylinder are respectively and hermetically fixed with the outer surfaces of two ends of the body, and the middle section of the rubber cylinder can perform radial reciprocating expansion and retraction relative to the body; the rubber cylinder sealing device is characterized in that a medium containing cavity, a sliding sleeve hole, a valve core hole, a first oil path and a second oil path are arranged in the rubber cylinder sealing device, the medium containing cavity is used for containing a medium for driving the rubber cylinder to seal and a high-pressure medium for releasing, the sliding sleeve hole is axially communicated with the valve core hole, the sliding sleeve is located in the sliding sleeve hole and can move in a reciprocating manner, the control valve core is located in the valve core hole and can move in a reciprocating manner, one end of the first oil path is communicated with the valve core hole, the other end of the first oil path is communicated with a gap between the rubber cylinder and the body, one end of the second oil path is communicated with the medium containing cavity, and the other; the sliding sleeve is selectively connected with the control valve core and can drive the control valve core to reciprocate so as to control the on-off relationship of the first oil path and the second oil path through the valve core hole.
2. The packer of claim 1, wherein the packer is further provided with a drive piston, a control assembly, a sliding sleeve elastomer, and a spool elastomer; the driving piston is located at one end in the valve core hole and can axially reciprocate, the sliding sleeve hole is formed in the driving piston, the sliding sleeve elastic piece is located in the sliding sleeve hole and is in contact with the sliding sleeve so as to drive the sliding sleeve to move towards the valve core hole relative to the driving piston, the control assembly is located between the driving piston and the sliding sleeve so as to limit the movement of the sliding sleeve relative to the driving piston, the valve core elastic piece is located in the valve core hole, one end of the valve core elastic piece is in contact with the lower end face of the driving piston, and the other end of the valve core elastic piece is in contact with the upper end face of the control valve core so as to drive the control valve core to axially move relative to the driving piston.
3. A packer according to claim 2, wherein the control assembly comprises a control piston, a piston bore, a control spring, and a control groove; the piston hole is formed in the driving piston, the control elastic part is located in the piston hole, the control piston is located in the piston hole and is in contact with the control elastic part, the control piston can extend into the sliding sleeve hole under the driving of the control elastic part, and the control groove is formed in the outer surface of the sliding sleeve;
when the sliding sleeve overcomes the action force of the sliding sleeve elastic part and is positioned in the sliding sleeve hole, the control piston extends into the control groove, so that the sliding sleeve and the control valve core are axially connected; when the control piston is recovered into the piston hole, the sliding sleeve extends to the valve core hole under the action force of the sliding sleeve elastic part, so that the sliding sleeve is disconnected with the control valve core.
4. The packer of claim 3, wherein the drive piston is provided with a control oil path; one end of the control oil way is communicated with the valve core hole, and the other end of the control oil way extends into the piston hole so as to drive the control piston to overcome the piston elastic part to recover and move by high-pressure medium introduced into the valve core hole.
5. The packer of claim 3, wherein the drive piston is provided with an auxiliary oil passage; one end of the auxiliary oil path is communicated with an external control medium, and the other end of the auxiliary oil path extends into the piston hole so as to assist the piston elastic piece to drive the control piston to extend into the piston groove.
6. The packer of claim 2, wherein the packer is provided with a deblocking oil path and a piston elastomer; one end of the deblocking oil path is communicated with an external control medium, the other end of the deblocking oil path extends to the upper end face of the driving piston, the piston elastic piece is located in the valve core hole, one end of the piston elastic piece is in contact with the lower end face of the driving piston, and the other end of the piston elastic piece is in contact with the body.
7. A packer as claimed in claim 2, further provided with a hook; the hook is rotationally connected with the driving piston, one end of the hook is rotationally connected with the sliding sleeve, and the other end of the hook is axially and selectively connected with the control valve core;
when the sliding sleeve moves relative to the control valve core in a direction close to the control valve core, the sliding sleeve drives the hook to rotate, so that the hook is disconnected from the control valve core; when the sliding sleeve moves relative to the control valve core in the direction far away from the control valve core, the sliding sleeve drives the hook to rotate, so that the hook is connected with the control valve core.
8. The packer of claim 2, wherein the sliding sleeve is provided with a balance oil path; one end of the balance oil way is communicated with the valve core hole, and the other end of the balance oil way extends to the containing cavity where the sliding sleeve elastic part is located.
9. The packer according to any one of claims 1 to 8, wherein a third oil path is provided on the control valve core; the third oil passage communicates a portion of the spool hole that communicates with the first oil passage with a portion of the spool hole that communicates with the second oil passage.
10. A packer as claimed in any one of claims 1 to 8, wherein the packing element is fixedly connected to the body by the upper and lower casings, and the upper and lower casings are connected to the packing element by means of a trapezoidal button.
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|---|---|---|---|
| CN202011629496.0A CN112761568B (en) | 2020-12-30 | 2020-12-30 | Packer |
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| CN202011629496.0A CN112761568B (en) | 2020-12-30 | 2020-12-30 | Packer |
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| CN112761568B CN112761568B (en) | 2022-12-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216892A (en) * | 2021-05-27 | 2021-08-06 | 亓桂景 | Downhole packer |
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| CN112761568B (en) | 2022-12-13 |
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Effective date of registration: 20221107 Address after: 257000 Yantai Road 103 Industrial Park, Dongying District, Dongying City, Shandong Province Applicant after: SHENGLI FANLAND OIL EQUIPMENT CO.,LTD. Address before: 252300 West unit 402, building 2, xinyuanyuan community, Yanggu County, Liaocheng City, Shandong Province Applicant before: Wu Fang |
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