CN102654042A - Coiled tubing fracture packer - Google Patents
Coiled tubing fracture packer Download PDFInfo
- Publication number
- CN102654042A CN102654042A CN201210144787XA CN201210144787A CN102654042A CN 102654042 A CN102654042 A CN 102654042A CN 201210144787X A CN201210144787X A CN 201210144787XA CN 201210144787 A CN201210144787 A CN 201210144787A CN 102654042 A CN102654042 A CN 102654042A
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- seal assembly
- lining
- central tube
- coiled tubing
- backwash
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Abstract
The invention discloses a coiled tubing fracture packer, comprising a central pipe, a back flushing valve assembly and a seal assembly, wherein an L-shaped track slot is formed in the central pipe, and a lower joint is connected with the lower end of the central pipe; the back flushing valve is connected with the upper end of the central pipe, an upper joint is connected with the upper end of the back flushing valve assembly, the back flushing valve assembly comprises a back flushing valve seat and a valve body, the back flushing valve seat is sleeved outside a valve body, the back flushing valve seat and the valve body are connected through a shear pin, and a back flushing channel is formed in the back flushing valve seat; and the seal assembly is sleeved outside the central pipe, an interlayer runner is arranged between the seal assembly and the central pipe, the seal assembly is movably connected or far away the back flushing valve assembly, and a track pin is arranged on the seal assembly and can change a track and slide in the L-shaped track slot along with the movement of the seal assembly. The coiled tubing fracture packer disclosed by the invention does not need to carry out tap seat seal and enables the seal assembly to slide in the L-shaped track slot through track-changing sliding of the track pin so as to realize the seal of the packer.
Description
Technical field
The present invention relates to fracturing tool field in the oil field development, particularly relate to a kind of coiled tubing pressure break packer that in the complicated track well, need not pitching seat envelope.
Background technology
Along with continually developing of all kinds of complicated track wells in oil field such as horizontal well, sidetracked hole and cluster well, proposed new problem for the fracturing technology technology.In the existing pressure break packer in oil field, mainly contain three kinds of rotation tubing string mechanical block envelope pressure break packer, pitching hydraulic base sealed packer and hydraulic base sealed packers.Wherein,
Rotation tubing string mechanical block envelope pressure break packer is because complicated well track makes moment of torsion and ballast be difficult for being delivered on the packer, and packer is difficult for the seat envelope.
The hydraulic base sealed pressure break packer of pitching makes the difficult ball seat that arrives of steel ball be difficult for the seat envelope because of the influence of oily cap and wax in the pit shaft.
Hydraulic base sealed pressure break packer is told sand because of pressing the anti-row in back, and fracturing sand is prone to sand pipe laying post and blocks tubing string.
In existing coiled tubing pressure break packer, mechanical block envelope is not too suitable, and designs a kind of pitching seat envelope that need not, and the pressure break packer that carries out backwash easily has good practical value in the complicated track well.
Summary of the invention
The objective of the invention is, a kind of coiled tubing pressure break packer is provided, it need not carry out pitching seat envelope, and it is to slide through track pin switching tracks in L type track groove seal assembly is slided, and realizes the seat envelope of packer with this.
Above-mentioned purpose of the present invention can adopt following technical proposal to realize:
A kind of coiled tubing pressure break packer, said packer comprises: central tube, which is provided with L type track groove, the lower end of said central tube is connected with lower contact; The backwash valve assembly, it is connected the upper end of said central tube, and the upper end of said backwash valve assembly connects top connection; Said backwash valve assembly comprises backwash valve seat and valve body, and said backwash valve cover for seat is located at the outside of valve body, and is connected with shear pin between the two; Said backwash valve seat is provided with the backwash passage, is not cut off under the state at shear pin, and said backwash passage is blocked by valve body; Cut off under the state at shear pin, move on the valve body and leave the backwash passage; Seal assembly; It is set in the outside of said central tube; And be provided with the interlayer runner between the two, said seal assembly connects movably or away from said backwash valve assembly, seal assembly is provided with track pin; Along with moving of seal assembly, the slip that can in said L type track groove, switch tracks of said track pin.
Aforesaid coiled tubing pressure break packer; Said backwash valve assembly also comprises fluid sealant spare and pressure cap; Said fluid sealant spare sealing shroud is located at the outside of said central tube, and is connected the lower end of said backwash valve seat, and the bottom of said pressure cap has annular holder portion; Said annular holder portion is connected the below of said fluid sealant spare, and the top of pressure cap is threaded on the said backwash valve seat.
Aforesaid coiled tubing pressure break packer, said L type track groove comprises: elongated slot, it is along the axis direction setting that is parallel to said central tube, and the upper end of elongated slot is the elongated slot top dead-centre; Short hook groove; It has short groove and hook groove, and the hook groove is connected with elongated slot through short groove, and short groove is along favouring the setting of central tube axis direction; The hook groove is along the axis direction setting that is parallel to central tube; The upper end of said hook groove is short hook groove top dead-centre, and the lower end of short groove is short hook groove bottom dead centre, and said elongated slot top dead-centre is positioned at the top of short hook groove top dead-centre.
Aforesaid coiled tubing pressure break packer; Said seal assembly comprises lining, the packing element group, the leather cup seat with set upright leather cup; Said lining is set in the outside of said central tube; Connect under the said backwash valve component states at said seal assembly, the top of said lining is connected on the seal assembly and seals said interlayer runner, and the upper end of said lining has the lining projection; Said packing element group, the leather cup seat with set upright the outside that leather cup all is set in said lining, and the packing element group is connected between lining projection and the leather cup seat, sets upright the lower end that leather cup is connected the leather cup seat, said track pin is fixed on the said lining.
Aforesaid coiled tubing pressure break packer, the top of said lining is provided with and can be used for pushing up the jacking block of establishing said seal assembly, and said lining projection is positioned at the below of jacking block.
Aforesaid coiled tubing pressure break packer, said packing element group has a plurality of packing elements, is connected with spacer ring between two adjacent packing elements.
Aforesaid coiled tubing pressure break packer, the bottom of said lining is provided with pawl spring.
The characteristics and the advantage of the pressure break packer of the embodiment of the invention are: its central tube is provided with L type track groove, and the interlayer runner is arranged on seal assembly and the central tube, makes the packer design attitude under the lower going-into-well smoothly; The seat envelope need not pitching when pressing crack construction; Only need the upper lifting pipe post, just can carry out normal pressing crack construction, adopt backwash valve during backwash; The sealing assembly moves down the dual fail-safe design of unlatching, and the possibility that makes tubing string sand card is minimum.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a coiled tubing fracturing technology sketch map;
Fig. 2 is that the coiled tubing pressure break packer of the embodiment of the invention partly cuts open sketch map before setting;
Fig. 2 A is the generalized section along the A A line of Fig. 2;
Fig. 2 B is the local enlarged diagram of expansion of the central tube of the embodiment of the invention, its corresponding diagram 2 and show the location status of track pin at short hook groove top dead-centre;
Fig. 3 is that the coiled tubing pressure break packer of the embodiment of the invention partly cuts open sketch map after setting;
Fig. 3 A is the local enlarged diagram of expansion of the central tube of the embodiment of the invention, its corresponding diagram 3 and show the location status of track pin at the elongated slot top dead-centre;
Fig. 4 is the local enlarged diagram of expansion of the central tube of the embodiment of the invention, and it shows the location status of track pin at short hook groove bottom dead centre.
The specific embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Upper-lower position described in this paper is to be directed against the user mode of pressure break packer after getting into the down-hole, and exactly, the top connection position of said pressure break packer is last, and the lower contact position is down.
As shown in Figure 1, pressure break packer A is connected with hydraulic anchor B and coiled tubing C in turn in use above it, and at this pressure break packer A that will connect successively from the bottom to top, hydraulic anchor B and coiled tubing C are called tubing string, and the outside of tubing string is provided with sleeve pipe D.
Coiled tubing pressure break packer extremely shown in Figure 4 like Fig. 2, that the embodiment of the invention proposes, it comprises central tube 1, backwash valve assembly 2 and seal assembly 3.Said central tube 1 is provided with L type track groove 1a, and the lower end of said central tube 1 is connected with lower contact 4.Said backwash valve assembly 2 is connected the upper end of central tube 1, and the upper end of said backwash valve assembly 2 connects top connection 5.Said seal assembly 3 is set in the outside of said central tube 1; And be provided with interlayer runner 6 between the two; Said seal assembly 3 connects or away from said backwash valve assembly 2 movably; Seal assembly 3 is provided with track pin 7, along with moving of seal assembly 3, and the slip that can in said L type track groove 1a, switch tracks of said track pin 7.
In the embodiment of the invention; Owing to be provided with interlayer runner 6 between seal assembly 3 and the central tube 1; Make the pressure break packer can successfully be lowered to the downhole designs position, the L type track groove 1a on the central tube 1 can be used for the slip that switches tracks of track pin 7, to carry out seat envelope and deblocking with the requirement of pressing crack construction.That is to say that the embodiment of the invention need not pitching seat envelope, central tube 1 can force seal assembly 3 slips to realize the seat envelope of packer through track pin 7, so makes this coiled tubing pressure break packer in the complicated track well, also can use.In addition, the packer of the embodiment of the invention also has backwash valve assembly 2, makes it in the complicated track well, carry out the backwash construction easily.
Said backwash valve assembly 2 comprises backwash valve seat 2a and valve body 2b; Said backwash valve seat 2a is set in the outside of valve body 2b, and is connected with shear pin 2c between the two, and said backwash valve seat 2a is provided with backwash passage 2d; When shear pin 2c is not cut off; Said backwash passage 2d is blocked by valve body 2b, when shear pin 2c is cut off, moves on the valve body 2b and leaves backwash passage 2d.
Wherein, said backwash passage 2d can have a plurality of, and it circumferentially is evenly distributed on the backwash valve seat 2a.
In the present embodiment, when carrying out the backwash construction, two passages are arranged.The firstth, backwash passage 2d, that is, during counter suppressing, pressure is cut off shear pin 2c, moves on the valve body 2b, makes backwash passage 2d be opened in coiled tubing C, and sleeve pipe D and packer runner are open-minded.Second is interlayer runner 6, that is, counter to push away seal assembly 3 descending for pressure during backwash, and interlayer runner 6 is by open-minded, and fluid returns into the packer root through interlayer runner 6 and returns the ground sand function that realizes recoiling along coiled tubing C again.
Furthermore; Said backwash valve assembly 2 also comprises fluid sealant spare 2e and pressure cap 2f; Said fluid sealant spare 2e sealing shroud is located at the outside of said central tube 1, and is connected the lower end of said backwash valve seat 2a, and the bottom of said pressure cap 2f has the annular holder 2g of portion; The said annular holder 2g of portion is connected the below of said fluid sealant spare 2e, and the top of pressure cap 2f is threaded on the said backwash valve seat 2a.
In the present embodiment; Fluid sealant spare 2e is fixedly connected on the lower end of backwash valve assembly 2 through pressure cap 2f, and the bottom of pressure cap 2f is the annular holder 2g of portion, and the annular holder 2g of portion holds fluid sealant spare 2e; Make fluid sealant spare 2e partly expose; When moving on the seal assembly 3, can be connected with fluid sealant spare 2e, thereby can seal interlayer runner 6 better to make things convenient for.
As an embodiment of the invention, like Fig. 2,2B, Fig. 3,3A and shown in Figure 4, said L type track groove 1a comprise elongated slot 1b and short hook groove.Said elongated slot 1b is along the axis direction setting that is parallel to said central tube 1, and the upper end of elongated slot 1b is elongated slot top dead-centre 1c.Said short hook groove has short groove 1d and hook groove 1e; Hook groove 1e is connected with elongated slot 1b through short groove 1d, and short groove 1d is along favouring central tube 1 axis direction setting, and promptly short groove 1d and central tube 1 axis have an angle; Hook groove 1e is along the axis direction setting that is parallel to central tube 1; The upper end of said hook groove 1e is short hook groove top dead-centre 1f, and the lower end of short groove 1d is short hook groove bottom dead centre 1g, and said elongated slot top dead-centre 1c is positioned at the top of short hook groove top dead-centre 1f.
Wherein, said L type track groove 1a can enclose a circle at the external surface of central tube 1, to make things convenient for the switch tracks slip of track pin 7 in L type track groove 1a.
As an embodiment of the invention, said seal assembly 3 comprises lining 3a, the packing element group, leather cup seat 3b with set upright leather cup 3c.Said lining 3a is set in the outside of said central tube 1, and when said seal assembly 3 connected said backwash valve assembly 1, the top of said lining 3a was connected on the seal assembly 3 and seals said interlayer runner 6, and the upper end of said lining 3a has lining projection 3d.Said packing element group, leather cup seat 3b with set upright the outside that leather cup 3c all is set in said lining 3a, and the packing element group is connected between lining projection 3d and the leather cup seat 3b, sets upright the lower end that leather cup 3c is connected leather cup seat 3b, said track pin 7 is fixed on the said lining 3a.
The top of said lining 3a can be provided with and can be used for pushing up the jacking block 3e that establishes said seal assembly 3, and said lining projection 3d is positioned at the below of jacking block 3e.Furthermore, said jacking block 3e can directly push up and be located on the said fluid sealant spare 2e, makes interlayer runner 6 to be closed better.
Said packing element group can have a plurality of packing element 3f, is connected with spacer ring 3g between two adjacent packing element 3f.Herein, have two packing element 3f and a spacer ring 3g.
The bottom of said lining 3a can be provided with pawl spring 3h.Particularly, the connector 3i of pressure cap and so on hold pawl spring 3h and with set upright leather cup 3c and be connected, thereby make pawl spring 3h and set upright leather cup 3c and locate better.
In addition, shown in Fig. 2 A, the both sides of central tube 1 are pruned one section and present the plane symmetrically, and so central tube 1 matches with seal assembly 3, and the part that central tube 1 is pruned can form interlayer runner 6.Certainly, in addition, also can be cut out one section in the inboard of the lining 3a of seal assembly 3, so lining 3a also cooperates with central tube 1 and can form the interlayer runner.
The packer of the embodiment of the invention has passed through the seat envelope, three processes of deblocking and backwash in use.
To design attitude, promptly before setting, said track pin 7 is positioned at short hook groove top dead-centre 1f place (shown in Fig. 2 B) with the tubing string lower going-into-well; Carry out setting of packer then, specifically be, earlier with carrying on the tubing string; Since seal assembly 3 set upright leather cup 3c and sleeve pipe D belongs to interference fit, during the upper lifting pipe post, under the frictional force effect of setting upright leather cup 3c and sleeve pipe D; Track pin 7 enters into short hook groove bottom dead centre 1g (as shown in Figure 4) by the short hook groove top dead-centre 1f of the L type track groove 1a of central tube 1; Then tubing string is transferred, track pin 7 enters into the elongated slot top dead-centre 1c (shown in Fig. 3 A) of elongated slot 1b, and completion sets.
After tubing string connects well head, in coiled tubing C, just suppress, pressure acts on to be set upright on the leather cup 3c, and it is up to promote seal assembly 3; Dock with the fluid sealant spare 2e in the backwash valve assembly 2, sealed interlayer runner 6, continue to suppress; Force is set upright leather cup 3c extruding packing element 3f, makes the packing element 3f envelope that rises, at this moment; Hydraulic anchor B grappling under the effect of interior pressure has prevented the tubing string wriggling, can carry out normal pressing crack construction subsequently.When pressing crack construction finishes, the packing element 3f of seal assembly 3 reclaims deblocking after the pressure release.
Describe about backwash process is existing in the above, repeat no more at this.
The above is merely several embodiments of the present invention, and those skilled in the art can carry out various changes or modification to the embodiment of the invention and do not break away from the spirit and scope of the present invention according to application documents are disclosed.
Claims (7)
1. coiled tubing pressure break packer is characterized in that said packer comprises:
Central tube which is provided with L type track groove, and the lower end of said central tube is connected with lower contact;
The backwash valve assembly, it is connected the upper end of said central tube, and the upper end of said backwash valve assembly connects top connection; Said backwash valve assembly comprises backwash valve seat and valve body, and said backwash valve cover for seat is located at the outside of valve body, and is connected with shear pin between the two; Said backwash valve seat is provided with the backwash passage, is not cut off under the state at shear pin, and said backwash passage is blocked by valve body; Cut off under the state at shear pin, move on the valve body and leave the backwash passage;
Seal assembly; It is set in the outside of said central tube; And be provided with the interlayer runner between the two, said seal assembly connects movably or away from said backwash valve assembly, seal assembly is provided with track pin; Along with moving of seal assembly, the slip that can in said L type track groove, switch tracks of said track pin.
2. coiled tubing pressure break packer according to claim 1; It is characterized in that said backwash valve assembly also comprises fluid sealant spare and pressure cap, said fluid sealant spare sealing shroud is located at the outside of said central tube; And be connected the lower end of said backwash valve seat; The bottom of said pressure cap has annular holder portion, and said annular holder portion is connected the below of said fluid sealant spare, and the top of pressure cap is threaded on the said backwash valve seat.
3. coiled tubing pressure break packer according to claim 1 is characterized in that, said L type track groove comprises:
Elongated slot, it is along the axis direction setting that is parallel to said central tube, and the upper end of elongated slot is the elongated slot top dead-centre;
Short hook groove; It has short groove and hook groove, and the hook groove is connected with elongated slot through short groove, and short groove is along favouring the setting of central tube axis direction; The hook groove is along the axis direction setting that is parallel to central tube; The upper end of said hook groove is short hook groove top dead-centre, and the lower end of short groove is short hook groove bottom dead centre, and said elongated slot top dead-centre is positioned at the top of short hook groove top dead-centre.
4. according to any described coiled tubing pressure break packer of claim 1 to 3, it is characterized in that said seal assembly comprises lining; The packing element group; The leather cup seat with set upright leather cup, said lining is set in the outside of said central tube, connects under the said backwash valve component states at said seal assembly; The top of said lining is connected on the seal assembly and seals said interlayer runner, and the upper end of said lining has the lining projection; Said packing element group, the leather cup seat with set upright the outside that leather cup all is set in said lining, and the packing element group is connected between lining projection and the leather cup seat, sets upright the lower end that leather cup is connected the leather cup seat, said track pin is fixed on the said lining.
5. coiled tubing pressure break packer according to claim 4 is characterized in that the top of said lining is provided with and can be used for pushing up the jacking block of establishing said seal assembly, and said lining projection is positioned at the below of jacking block.
6. coiled tubing pressure break packer according to claim 4 is characterized in that said packing element group has a plurality of packing elements, is connected with spacer ring between two adjacent packing elements.
7. coiled tubing pressure break packer according to claim 4 is characterized in that the bottom of said lining is provided with pawl spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210144787.XA CN102654042B (en) | 2012-05-10 | 2012-05-10 | Coiled tubing fracture packer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210144787.XA CN102654042B (en) | 2012-05-10 | 2012-05-10 | Coiled tubing fracture packer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102654042A true CN102654042A (en) | 2012-09-05 |
| CN102654042B CN102654042B (en) | 2014-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210144787.XA Active CN102654042B (en) | 2012-05-10 | 2012-05-10 | Coiled tubing fracture packer |
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| CN (1) | CN102654042B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107780876A (en) * | 2017-10-18 | 2018-03-09 | 中国石油天然气股份有限公司 | A kind of Trajectory of Horizontal Well formula Tubing Packer and packing method |
| CN110821443A (en) * | 2018-08-09 | 2020-02-21 | 中国石油天然气股份有限公司 | RD valve perforation protector and layered perforation oil testing tubular column |
| CN111058793A (en) * | 2018-10-16 | 2020-04-24 | 中国石油化工股份有限公司 | Gradual unsealing device |
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| CN202560155U (en) * | 2012-05-10 | 2012-11-28 | 中国石油天然气股份有限公司 | Continuous oil pipe fracturing packer |
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| CN2573661Y (en) * | 2002-06-17 | 2003-09-17 | 侯宗 | Spinning separated layer injection packer |
| US20060090904A1 (en) * | 2004-11-02 | 2006-05-04 | Mcguire Bob | Cup tool, cup tool cup and method of using the cup tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107780876A (en) * | 2017-10-18 | 2018-03-09 | 中国石油天然气股份有限公司 | A kind of Trajectory of Horizontal Well formula Tubing Packer and packing method |
| CN110821443A (en) * | 2018-08-09 | 2020-02-21 | 中国石油天然气股份有限公司 | RD valve perforation protector and layered perforation oil testing tubular column |
| CN110821443B (en) * | 2018-08-09 | 2021-09-28 | 中国石油天然气股份有限公司 | RD valve perforation protector and layered perforation oil testing tubular column |
| CN111058793A (en) * | 2018-10-16 | 2020-04-24 | 中国石油化工股份有限公司 | Gradual unsealing device |
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| Publication number | Publication date |
|---|---|
| CN102654042B (en) | 2014-09-24 |
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