CN211448608U - Forced deblocking packer - Google Patents
Forced deblocking packer Download PDFInfo
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- CN211448608U CN211448608U CN202020071237.XU CN202020071237U CN211448608U CN 211448608 U CN211448608 U CN 211448608U CN 202020071237 U CN202020071237 U CN 202020071237U CN 211448608 U CN211448608 U CN 211448608U
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Abstract
The utility model relates to a forced deblocking packer, which is structurally characterized in that a setting liquid inlet parting joint is arranged on a central tube, and the position of the setting liquid inlet parting joint corresponds to the position of a sealing rubber cylinder; the outer circumference of the central tube is connected with a lifting piston in a sliding way, the inner circumference of the central tube is provided with a balance sealing cavity, the central tube is provided with a balance cavity liquid passing seam, and the position of the balance cavity liquid passing seam corresponds to the position of the balance sealing cavity; the outer circumference of the lower end part of the lifting piston is in sealing fit with the upper rubber cylinder seat, the upper rubber cylinder seat is connected with the upper end of the sealing rubber cylinder in a threaded sealing way, and a sealed liquid containing cavity is formed at the upper ends of the central tube, the lower end part of the lifting piston, the upper rubber cylinder seat and the sealing rubber cylinder and absorbs liquid in the sealing rubber cylinder when the volume of the liquid containing cavity is increased; the upper end of the lifting piston is in threaded connection with the upper joint, and the middle part of the lifting piston is provided with a locking pin which is positioned with the central pipe. The packer provides a forcible lifting liquid accommodating cavity, liquid in the rubber sleeve can be forcedly pumped to the liquid absorbing cavity, the rubber sleeve is forcibly recycled, and the problem that a drilling tool is stuck due to the fact that the rubber sleeve of the packer is not unsealed is solved.
Description
Technical Field
The invention relates to a forced unsetting packer which is used for stratum reconstruction measures and technologies such as multi-stage staged fracturing, acidification and the like of an oil well and a natural gas well.
Background
The prior art is the construction operation of multistage, staged fracturing and acidizing of the conventional expanding packer. The process can meet the construction requirements in the conventional construction well; but in special well construction, such as: in the construction of special oil wells or natural gas wells with large sand volume construction wells, large discharge construction wells, high stratum density and the like, due to the influences of the well conditions such as long working time of the packer, high working pressure or sand blockage, sand burying and the like, the packer cannot be unsealed or liquid is sealed, so that the packer cannot be unsealed due to the fact that the inside of a rubber sleeve cannot be discharged, the drilling tool is blocked, the construction efficiency is influenced, and certain economic loss can be caused.
Disclosure of Invention
The invention provides a packer capable of being unsealed forcibly, which is provided with a forcibly lifting liquid accommodating cavity, can forcibly pump liquid in a rubber cylinder to a liquid absorbing cavity and forcibly recover the rubber cylinder, and solves the problem that a drilling tool is blocked due to the fact that the rubber cylinder of the packer is not unsealed.
In order to solve the problems, the invention creates the following specific technical scheme: a forced deblocking packer comprises an upper joint, a lower joint, a central pipe, an upper rubber sleeve seat and a sealing rubber sleeve, wherein a setting liquid inlet separation seam is arranged on the central pipe, and the position of the setting liquid inlet separation seam corresponds to the position of the sealing rubber sleeve; the outer circumference of the central tube is connected with a lifting piston in a sliding way, the inner circumference of the lifting piston is provided with a balance sealing cavity, the central tube is provided with a balance cavity liquid passing seam, and the position of the balance cavity liquid passing seam corresponds to the position of the balance sealing cavity; the outer circumference of the lower end part of the lifting piston is in sealing fit with the upper rubber cylinder seat, the upper rubber cylinder seat is connected to the upper end of the sealing rubber cylinder in a threaded sealing manner, a sealed liquid containing cavity is formed by the central pipe, the lower end part of the lifting piston, the upper rubber cylinder seat and the upper end part of the sealing rubber cylinder, and liquid in the sealing rubber cylinder is absorbed when the volume of the liquid containing cavity is increased; the upper end of the upward lifting piston is in threaded connection with the upper joint, and the middle of the upward lifting piston is provided with a locking pin which is positioned with the central pipe.
The outside screw thread sealing connection coupling of center tube, the locking pin inserts in the locating hole of coupling after lifting piston threaded connection, and is equipped with the sealing washer respectively in the both sides of locking pin.
Circle thread sealing connection sand control pipe in the upper end of coupling, be equipped with locking piece feed liquor parting joint at the lower extreme of sand control pipe, be equipped with the through-hole in the coupling corresponding position, the through-hole internal seal sets up hydraulic locking piece, is equipped with corresponding fixed slot on carrying the piston, hydraulic locking piece cooperates with fixed slot under the high-pressure liquid effect of entering in locking piece feed liquor parting joint, and fixed slot and hydraulic locking piece's fitting surface is the fillet transition face.
The upper end of the sand control pipe is provided with a pressure relief liquid passing separation seam, one-way valves are uniformly distributed on the circumference of the upper joint, and the direction of the one-way valves is that liquid flows out from the inner cavity of the pipe to the outer cavity of the pipe; after the upper joint is lifted and moved, the position of the one-way valve corresponds to the position of the pressure relief liquid passing gap, and the liquid pressure in the central pipe is discharged.
The upper end of the sealing rubber cylinder is vulcanized and bonded with the connecting joint, the inner circumference of the connecting joint is in threaded connection with the central pipe, and the sealing rubber cylinder, the connecting joint and the central pipe are vulcanized and bonded together; the outer circumference of the connecting joint is connected with an upper rubber cylinder seat in a sealing way.
The lower end of the upward lifting piston is provided with a radial piston balance hole, one end of the piston balance hole is a small-diameter hole, the upper end of the small-diameter hole is communicated with the balance sealing cavity, and the lower end of the small-diameter hole is sealed and isolated from the liquid accommodating cavity; the other end of the piston balance hole is a large-diameter hole, the liquid pressure of the large-diameter hole acts on the upper rubber cylinder seat, and sealing structures are arranged at two ends of the large-diameter hole in a sealing mode.
This force deblocking packer has adopted the structure that liquid held the chamber, after producing relative motion between last piston and the last bobbin base, makes liquid hold the liquid in the big increase of cavity and forces the absorption packing element to make the packing element force the deblocking, improved production efficiency.
A coupling is arranged between the lifting piston and the central tube, and the locking pin is clamped with the coupling, so that the overall strength is improved.
The hydraulic locking block is arranged on the upper part of the coupling, so that the coupling, the sand control pipe and the lifting piston do not move relatively in the working process, and the structure is stable.
The upper joint is provided with a one-way valve, and in the forced deblocking process, the pressure in the central pipe is discharged, so that the sealing rubber cylinder is ensured to have no internal pressure effect.
In order to ensure that the upper end of the sealing rubber cylinder is communicated with the liquid containing cavity, the sealing rubber cylinder is vulcanized into an integrated structure with the central pipe and the connecting structure.
The upper lifting piston is provided with a piston balance hole, so that the adsorption force between the upper rubber cylinder seat and the upper lifting piston is increased, and the stability of each part in the setting process is ensured.
Drawings
FIG. 1 is a schematic diagram of a forced unset packer.
Fig. 2 is a partially enlarged view of fig. 1.
Detailed Description
As shown in fig. 1 and 2, the packer comprises an upper joint 1, a lower joint 8, a central pipe 5, an upper rubber sleeve seat 6 and a sealing rubber sleeve 7, wherein a setting liquid inlet separation seam 16 is arranged on the central pipe 5 and corresponds to the sealing rubber sleeve 7 in position; the outer circumference of the central tube 5 is connected with the lifting piston 3 in a sliding way, the inner circumference of the lifting piston 3 is provided with a balance sealing cavity 27, the central tube 5 is provided with a balance cavity liquid passing seam 15, and the position of the balance cavity liquid passing seam 15 corresponds to the position of the balance sealing cavity 27; the outer circumference of the lower end part of the lifting piston 3 is in sealing fit with the upper rubber cylinder base 6, the upper rubber cylinder base 6 is connected with the upper end of the sealing rubber cylinder 7 in a threaded sealing way, a sealed liquid containing cavity 20 is formed by the central tube 5, the lower end part of the lifting piston 3, the upper rubber cylinder base 6 and the upper end part of the sealing rubber cylinder 7, and liquid in the sealing rubber cylinder 7 is absorbed when the volume of the liquid containing cavity 20 is increased; the upper end of the upper lifting piston 3 is connected with the upper connector 1 in a threaded manner, and the middle part of the upper lifting piston 3 is provided with a locking pin 10 positioned with the central pipe 5. When the locking pin 10 is cut off by external force, the lifting piston 3 moves upwards, the liquid containing cavity 20 is enlarged, liquid in the rubber sleeve can be forcibly pumped to the liquid containing cavity, the rubber sleeve is forcibly recycled, and the problem that the drilling tool is stuck due to the fact that the rubber sleeve of the packer is not unsealed is solved.
The outside screw thread of center tube 5 connect with coupling 4 sealingly, insert into the locating hole of coupling 4 after locking pin 10 and lifting piston 3 threaded connection, and be equipped with the sealing washer respectively in the both sides of locking pin 10.
Circle thread sealing connection sand control pipe 2 in the upper end of coupling 4, be equipped with locking piece feed liquor parting joint 13 at the lower extreme of sand control pipe 2, be equipped with the through-hole in coupling 4 corresponding position, the through-hole internal seal sets up hydraulic locking piece 14, be equipped with corresponding fixed slot 25 on lifting piston 3, hydraulic locking piece 14 cooperates with fixed slot 25 under the high-pressure liquid effect of locking piece feed liquor parting joint 13 internal access, and fixed slot 25 is the fillet transition surface with the fitting surface of hydraulic locking piece 14, this transition fillet has realized that the in-process that lifting piston 3 moved up promotes hydraulic locking piece 14 and contracts to coupling 4 in.
The upper end of the sand control pipe 2 is provided with a pressure relief liquid passing gap 12, one-way valves 9 are uniformly distributed on the circumference of the upper joint 1, and the direction of the one-way valves 9 is that liquid flows out from the inner cavity of the pipe to the outer cavity of the pipe; after the upper joint 1 is lifted and moved, the position of the one-way valve 9 corresponds to the position of the pressure relief liquid-passing gap 12, and the liquid pressure in the central pipe is discharged.
The upper end of the sealing rubber cylinder 7 is vulcanized and bonded with a connecting joint 26, the inner circumference of the connecting joint 26 is in threaded connection with the central pipe 5, and the sealing rubber cylinder 7, the connecting joint 26 and the central pipe 5 are vulcanized and bonded together; the outer circumference of the connecting joint 26 is hermetically connected with the upper rubber cylinder seat 6.
The lower end of the upward lifting piston 3 is provided with a radial piston balance hole 11, one end of the piston balance hole 11 is a small-diameter hole, the upper end of the small-diameter hole is communicated with a balance sealing cavity 27, and the lower end of the small-diameter hole is sealed and isolated with the liquid accommodating cavity 20; the other end of the piston balance hole 11 is a large-diameter hole, the liquid pressure of the large-diameter hole acts on the upper rubber cylinder base 6, the two ends of the piston balance hole are sealed to form sealing structures, the piston balance hole 11 is used for balancing the internal pressure and the external pressure of the upper piston 3, and the overall pressure balance in the working process is guaranteed.
The pressure-relief liquid-passing parting line 12, the locking block liquid inlet parting line 13 and the balance cavity liquid inlet parting line 15 are processed in the circumferential direction along the axial direction by adopting a linear cutting method, and the width of the gap is smaller than the diameter of small gravel, so that the effect of blocking silt is achieved, and the whole service life of the packer is prolonged.
The setting and unsealing method for controlling the forced unsealing packer to set and unseal the tubular column comprises the following steps:
1) setting: in the construction process, liquid enters the sealing rubber barrel 7 from the setting liquid inlet gap 16 of the central pipe 5, the sealing rubber barrel 7 is sealed in an expanding mode, meanwhile, the liquid enters through the locking block liquid inlet gap 13, the hydraulic locking block 14 is pushed to be locked with the lifting piston 3, the liquid enters the balance sealing cavity 27 through the balance cavity liquid inlet gap 15, the lifting piston 3 is locked, and the packer completes setting;
2) deblocking: after fracturing construction, no pressure exists in the central pipe, the sealing rubber cylinder 7 retracts, deblocking is smoothly carried out, drilling is smoothly carried out within the specified tonnage, and the lifting piston 3 of the packer is not started at the moment;
3) and (3) forced deblocking: if the drill is stopped, the sealing rubber tube 7 cannot be retracted smoothly, the upper connector 1 is lifted up at the moment, the upper lifting piston 3 is driven to move upwards forcibly, the fixed clamping groove 25 pushes the hydraulic locking block 14 to retract, and meanwhile, the locking pin 10 is cut off; in the process of moving the upward piston 3 upwards, the volume of the liquid accommodating cavity 20 is increased, and the liquid in the sealing rubber cylinder 7 is absorbed by the liquid accommodating cavity 20, so that the sealing rubber cylinder 7 is passively retracted; after the upward lifting piston 3 moves upwards, the one-way valve 9 is communicated with the pressure relief liquid-passing gap 12, so that the pressure in the central tube 5 is discharged, the sealing rubber tube is guaranteed not to be acted by the internal pressure any more, and forced deblocking is smoothly completed.
Claims (6)
1. The utility model provides a force deblocking packer, includes top connection (1), lower clutch (8), center tube (5), last bobbin base (6) and sealed packing element (7), its characterized in that: a setting liquid inlet separation seam (16) is arranged on the central tube (5) and corresponds to the sealing rubber cylinder (7); the outer circumference of the central tube (5) is connected with a lifting piston (3) in a sliding way, the inner circumference of the lifting piston (3) is provided with a balance sealing cavity (27), the central tube (5) is provided with a balance cavity liquid passing seam (15), and the position of the balance cavity liquid passing seam (15) corresponds to the position of the balance sealing cavity (27); the outer circumference of the lower end part of the lifting piston (3) is in sealing fit with the upper rubber cylinder seat (6), the upper rubber cylinder seat (6) is connected to the upper end of the sealing rubber cylinder (7) in a threaded sealing manner, a sealed liquid accommodating cavity (20) is formed by the central tube (5), the lower end part of the lifting piston (3), the upper rubber cylinder seat (6) and the upper end part of the sealing rubber cylinder (7), and liquid in the sealing rubber cylinder (7) is absorbed when the volume of the liquid accommodating cavity (20) is increased; the upper end of the upper lifting piston (3) is in threaded connection with the upper joint (1), and the middle part of the upper lifting piston (3) is provided with a locking pin (10) positioned with the central pipe (5).
2. The forced unset packer of claim 1, wherein: the outside screw thread sealing connection coupling (4) of center tube (5), insert in the locating hole of coupling (4) after locking pin (10) and lift piston (3) threaded connection, and be equipped with the sealing washer respectively in the both sides of locking pin (10).
3. The forced unset packer of claim 2, wherein: circle thread sealing connection sand control pipe (2) in the upper end of coupling (4), lower extreme at sand control pipe (2) is equipped with locking piece feed liquor crack (13), be equipped with the through-hole in coupling (4) corresponding position, the through-hole internal seal sets up hydraulic locking piece (14), be equipped with corresponding fixed slot (25) on carrying piston (3), hydraulic locking piece (14) are in locking piece feed liquor crack (13) the high-pressure liquid effect of entering down with fixed slot (25) cooperation, and the fitting surface of fixed slot (25) and hydraulic locking piece (14) is the fillet transition surface.
4. The forced unset packer of claim 3, wherein: the upper end of the sand control pipe (2) is provided with a pressure relief liquid passing gap (12), check valves (9) are uniformly distributed on the circumference of the upper joint (1), and the direction of the check valves (9) is that liquid flows out from the inner cavity of the pipe to the outer cavity of the pipe; after the upper joint (1) is lifted and moved, the position of the one-way valve (9) corresponds to the position of the pressure relief liquid passing gap (12), and the liquid pressure in the central pipe is discharged.
5. The forced unset packer of claim 1 or 4, wherein: the upper end of the sealing rubber cylinder (7) is vulcanized and bonded with a connecting joint (26), the inner circumference of the connecting joint (26) is in threaded connection with the central pipe (5), and the sealing rubber cylinder (7), the connecting joint (26) and the central pipe (5) are vulcanized and bonded together; the outer circumference of the connecting joint (26) is connected with the upper rubber cylinder seat (6) in a sealing way.
6. The forced unset packer of claim 3, wherein: the lower end of the upward lifting piston (3) is provided with a radial piston balance hole (11), one end of the piston balance hole (11) is a small-diameter hole, the upper end of the small-diameter hole is communicated with a balance sealing cavity (27), and the lower end of the small-diameter hole is sealed and isolated with the liquid accommodating cavity (20); the other end of the piston balance hole (11) is a large-diameter hole, the liquid pressure of the large-diameter hole acts on the upper rubber cylinder seat (6), and two ends of the large-diameter hole are sealed to form sealing structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020071237.XU CN211448608U (en) | 2020-01-14 | 2020-01-14 | Forced deblocking packer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020071237.XU CN211448608U (en) | 2020-01-14 | 2020-01-14 | Forced deblocking packer |
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| CN211448608U true CN211448608U (en) | 2020-09-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110905438A (en) * | 2020-01-14 | 2020-03-24 | 铁岭曲氏石油技术开发服务有限公司 | Forced unsetting packer and control method thereof |
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2020
- 2020-01-14 CN CN202020071237.XU patent/CN211448608U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110905438A (en) * | 2020-01-14 | 2020-03-24 | 铁岭曲氏石油技术开发服务有限公司 | Forced unsetting packer and control method thereof |
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