CN105937369A - Retractable high-pressure sealing tie-back device with locking mechanism - Google Patents
Retractable high-pressure sealing tie-back device with locking mechanism Download PDFInfo
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- CN105937369A CN105937369A CN201610483220.3A CN201610483220A CN105937369A CN 105937369 A CN105937369 A CN 105937369A CN 201610483220 A CN201610483220 A CN 201610483220A CN 105937369 A CN105937369 A CN 105937369A
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- sealing
- locking mechanism
- lock claw
- high pressure
- intubates
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
The invention relates to a retractable high-pressure sealing tie-back device with a locking mechanism. The device comprises a sealing insertion pipe and a sealing cylinder, an adjusting ring, a force transmission joint and a locking claw are sequentially arranged on the outer side of the upper end of the sealing insertion pipe from top to bottom, the force transmission joint and the locking claw can move up and down on the sealing insertion pipe, and a sealing device is arranged at the lower end of the sealing insertion pipe; the sealing device comprises three sealing covers, the adjacent sealing covers are connected through threads, the locking claw is connected with the inner side of the upper portion of the sealing cylinder, and the lower portion of the sealing cylinder is a sealing face. By means of the locking function of the locking claw, it is guaranteed that the sealing insertion pipe and the sealing cylinder are not separated in the fracturing construction process; by means of the sealing device, high-pressure sealing between the sealing insertion pipe and the sealing cylinder is guaranteed; the sealing device is composed of three stages of mutually independent units which do not interfere with one another, and it is guaranteed that when the first-stage sealing unit is damaged, sealing performance is not affected.
Description
Technical field
The invention belongs to well fracturing technical field, be specifically related to the reversible high pressure sealing tieback assembly of a kind of with locking mechanism, for docking of open hole packer staged fracturing top tieback string and bottom Back-off Pipe String.
Background technology
Continuous exploitation along with world petroleum resource, the petroleum resources that reservoir properties preferably, is relatively easily exploited is fewer and feweri, the low-grade petroleum resources that the most substantial amounts of reservoir properties is complicated, well yield is low is becoming the main body produced on oil, natural gas, the oil gas field effective exploitation to be obtained of reservoir properties difference, it is crucial for improving yield, and horizontal well has become as a kind of effective means improving hypotonic oil gas field well yield in recent years.Wherein open-hole horizontal well becomes a kind of important completion methods of horizontal wells greatly with long-pending with formation-engaging surfaces, open hole packer fracturing strings relies on drilling rod to send into, and gives up, trip out top rod after packer setting, connect sealing with oil pipe again and intubate tieback, it is achieved tubing string seals.
The sealing used in early days intubates only sealing function, not with locking mechanism, when pressing crack construction, owing to operation pressure fluctuates, easily cause string creep, thus cause sealing to intubate and depart from sealing drum, and during wriggling, seal the sealing device that intubates the most damaged and lose sealability, top tubing string can only be changed to complete follow-up pressing crack construction, increase construction cost and operating risk.And change tubing string and need kill-job, segmentation correctional effect may finally be made to not fully reach purpose of design, affect oil gas well yield.Mostly it is made up of multiple-sealed circle and back-up ring simultaneously as seal the sealing mechanism that intubates, is damaged when wherein one sealing ring and after coming off, whole sealing unit will be moved, and causes seal failure, thus affects pressing crack construction safety.
Summary of the invention
It is an object of the invention to overcome prior art seals and intubate not locking and sealing unit, the most separate and easily cause sealing to intubate and sealing drum departs from and the problem of seal failure.
For this, the invention provides the reversible high pressure sealing tieback assembly of a kind of with locking mechanism, intubate including sealing and sealing drum, described sealing intubates outside upper end and to be sequentially provided with regulation ring, force transmission joint and lock claw from top to bottom, force transmission joint and lock claw can move up and down on sealing intubates, sealing intubates lower end and is provided with sealing device, described sealing device includes three seal closures, screwed connection is relied between adjacent seal closure, described lock claw is connected to sealing drum upper inner, and described sealing drum bottom is sealing surface.
Described seal closure is sequentially provided with sealing ring, back-up ring, polytetrafluoro pad one, spacer ring, polytetrafluoro pad two from top to bottom.
Described polytetrafluoro pad one and polytetrafluoro pad about two are respectively arranged at two ends with the grommet of bowl structure.
Described grommet is bowl structure.
Described sealing intubates upper outside and is circumferentially with power transmission groove, and power transmission groove is positioned at below regulation ring.
Described force transmission joint internal circumferential is provided with inwardly protruded force transfer key, and force transfer key can move up and down in power transmission groove.
The lower end of described lock claw is provided with a cone.
Described lock claw is divided into 6 lobes.
Described sealing device lower end is set to taper, and taper is up big and down small.
Beneficial effects of the present invention:
(1) the reversible high pressure sealing tieback assembly of this with locking mechanism of the present invention utilizes the lock function of lock claw, ensure that in pressing crack construction process seal intubate with sealing drum without departing from, guaranteed by sealing device to seal the high pressure sealing intubating between sealing drum, and sealing device divides three grades of separate unit compositions, and do not interfere with each other mutually, ensure that sealing is unaffected when wherein primary seal unit is damaged, additionally, lock claw is unidirectional left-hand thread screw thread, can be realized it separate with sealing drum by rotating forward to intubate when technique needs, convenient dismounting.
(2) the reversible high pressure sealing tieback assembly of this with locking mechanism of the present invention sets sealing ring, back-up ring, polytetrafluoro pad one, spacer ring, polytetrafluoro pad two on the seal closure of sealing device the most successively; back-up ring provides protection for sealing ring; it is prevented to be damaged when moving in sealing drum; and two-stage polytetrafluoro pad is separated by spacer ring; prevent from interfering, it is ensured that sealing effectiveness.
(3) the reversible high pressure sealing tieback assembly of this with locking mechanism of the present invention by setting the grommet of bowl structure respectively at polytetrafluoro pad one and polytetrafluoro pad about two two ends, plays the effect of protection polytetrafluoro pad.
(4) the reversible high pressure sealing tieback assembly of this with locking mechanism of the present invention is provided with power transmission groove on sealing intubates, force transfer key is had inside force transmission joint, power transmission bond energy moves up and down in power transmission groove, when rotary seal intubates, and the cooperation transmission moment of torsion of force transfer key and power transmission groove, torque drive is reached force transmission joint, driving the movement of lock claw, seal and intubate and the lock claw axial displacement of generation, lock claw intubates top along sealing and moves, enlarged outside diameter, locks with sealing drum.
(5) the reversible high pressure sealing tieback assembly of this with locking mechanism of the present invention is by setting a cone in the lower end of lock claw, when after the unidirectional left-hand thread thread lock at lock claw and sealing drum top, on propose sealing when intubating, cone can support to inside lock claw, make lock claw external diameter become big, increase and intubate the latching force between sealing drum.
(7) the reversible high pressure sealing tieback assembly of this with locking mechanism of the present invention is taper by arranging sealing device lower end, up big and down small, facilitates sealing to intubate insertion sealing drum.
(8) the reversible high pressure sealing tieback assembly of this with locking mechanism of the present invention is by being connected lock claw top with force transmission joint lower thread, the more fastening that lock claw and force transmission joint connect can be made, ensure that force transmission joint drives lock claw and sealing to intubate the axial displacement of generation, lock with sealing drum.
Below with reference to accompanying drawing, the present invention is described in further details.
Accompanying drawing explanation
Fig. 1 is that the present invention seals the structural representation intubated after inserting sealing drum；
Fig. 2 is the structural representation that the present invention seals intubation seal device；
Fig. 3 is the sealing cannula structures schematic diagram of the present invention；
Fig. 4 is the force transmission joint structural representation of the present invention；
Fig. 5 is the lock claw structural representation of the present invention.
Description of reference numerals: 1, sealing intubates；2, regulation ring；3, force transmission joint；4, lock claw；5, sealing drum；6, sealing device；7, power transmission groove；8, sealing ring；9, back-up ring；10a, polytetrafluoro pad one；10b, polytetrafluoro pad two；11, spacer ring；12, grommet；13, seal closure；14, cone；15, force transfer key.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in further detail:
Embodiment 1:
nullNot locking and sealing unit is intubated in order to prior art seals，The most separate and easily cause sealing intubate and sealing drum depart from and the problem of seal failure，Present embodiments provide the reversible high pressure sealing tieback assembly of a kind of with locking mechanism，As shown in Figure 1，1 and sealing drum 5 is intubated including sealing，Described sealing intubates outside 1 upper end and to be sequentially provided with regulation ring 2 from top to bottom、Force transmission joint 3 and lock claw 4，Force transmission joint 3 and lock claw 4 can intubate in sealing and move up and down on 1，Sealing intubates 1 lower end and is provided with sealing device 6，Described sealing device 6 includes three seal closures 13，Screwed connection is relied between adjacent seal closure 13，Described lock claw 4 is connected to 5 inner sides of sealing drum，Lock claw 4 lower outside is provided with unidirectional left-hand thread screw thread，Threaded with the unidirectional left-hand thread of sealing drum 5 upper inner，Described sealing drum 5 bottom is sealing surface.
The operation principle of the reversible high pressure sealing tieback assembly of this with locking mechanism of the present invention is as follows:
Sealing intubates 1 upper end and is provided with regulation ring 2, the position of force transmission joint 3 is adjusted by regulation ring 2, force transmission joint 3 and lock claw 4 connect, and force transmission joint 3 and lock claw 4 can intubate in sealing and move up and down on 1, lock claw 4 top is threaded connection with force transmission joint 3 bottom, make the more fastening that lock claw 4 and force transmission joint 3 connect, ensure that force transmission joint 3 drives lock claw 4 and sealing to intubate the 1 axial displacement of generation, lock with sealing drum 5, lock claw 4 lower outside is provided with unidirectional left-hand thread screw thread, after sealing intubates 1 insertion sealing drum 5, lock claw 4 and the unidirectional left-hand thread thread lock of sealing drum 5 upper inner, guarantee the two without departing from.
When applying internal high pressure or axial tension, sealing intubate 1 and lock claw 4 there is axial displacement, lock claw 4 intubates 1 top along sealing and moves, enlarged outside diameter, lock with sealing drum 5, axial tension is transferred to sealing by lock claw 4 and intubates on 1, reduce the risk that lock claw 4 is pulled off, sealing drum 5 bottom is sealing surface, seal sealing device 6 realization and the sealing of sealing drum 5 intubating 1 dependence its underpart, sealing device 6 is made up of three separate sealing units, screwed connection is relied between it, guarantee ought wherein primary seal unit receive damage and in the case of losing sealability, additionally two-stage sealability is unaffected.Sealing if desired intubates 1 take out from sealing drum 5, apply axial tension 1-2 ton, owing to lock claw 4 is unidirectional left-hand thread screw thread, only need to rotate forward sealing intubates 1, moment of torsion is transferred to lock claw 4 by force transmission joint 3, in rotation process keep axial tension 1-2 ton constant, when pulling force suddenly disappears, show sealing intubate 1 and sealing drum 5 have disengaged from.
The present invention utilizes the lock function of lock claw, ensure that in pressing crack construction process seal intubate with sealing drum without departing from, guaranteed by sealing device to seal the high pressure sealing intubating between sealing drum, and sealing device divides three grades of separate unit compositions, and it does not interfere with each other mutually, it is ensured that when wherein primary seal unit is damaged, sealing is unaffected, additionally, lock claw is unidirectional left-hand thread screw thread, can realize it separate with sealing drum by rotating forward to intubate when technique needs, convenient dismounting.
Embodiment 2:
On the basis of embodiment 1, present embodiments provide the reversible high pressure sealing tieback assembly of a kind of with locking mechanism, 1 and sealing drum 5 is intubated including sealing, described sealing intubates outside 1 upper end and to be sequentially provided with regulation ring 2, force transmission joint 3 and lock claw 4 from top to bottom, force transmission joint 3 and lock claw 4 can intubate in sealing and move up and down on 1, sealing intubates 1 lower end and is provided with sealing device 6, described sealing device 6 includes three seal closures 13, screwed connection is relied between adjacent seal closure 13, described lock claw 4 is connected to 5 inner sides of sealing drum, and described sealing drum 5 bottom is sealing surface.Further; as shown in Figure 2; described seal closure 13 is sequentially provided with sealing ring 8, back-up ring 9, polytetrafluoro pad one 10a, spacer ring 11, polytetrafluoro pad two 10b from top to bottom; back-up ring 9 provides protection for sealing ring 8; it is prevented to be damaged when moving in sealing drum; and two-stage polytetrafluoro pad is separated by spacer ring 11, prevent from interfering.
Further, described polytetrafluoro pad one 10a and polytetrafluoro pad two 10b is respectively arranged at two ends with grommet 12 up and down, and described grommet 12 is bowl structure.Grommet 12 is bowl assembling structure, shields at polytetrafluoro pad two ends.
Embodiment 3:
On the basis of embodiment 2, present embodiments provide the reversible high pressure sealing tieback assembly of a kind of with locking mechanism, 1 and sealing drum 5 is intubated including sealing, described sealing intubates outside 1 upper end and to be sequentially provided with regulation ring 2, force transmission joint 3 and lock claw 4 from top to bottom, force transmission joint 3 and lock claw 4 can intubate in sealing and move up and down on 1, sealing intubates 1 lower end and is provided with sealing device 6, described sealing device 6 includes three seal closures 13, screwed connection is relied between adjacent seal closure 13, described lock claw 4 is connected to 5 inner sides of sealing drum, and described sealing drum 5 bottom is sealing surface.Further, as shown in Figure 3, described sealing intubates 1 upper outside and is circumferentially with four power transmission grooves 7, as shown in Figure 4, power transmission groove 7 is positioned at below regulation ring 2, described force transmission joint 3 internal circumferential is provided with four inwardly protruded force transfer keys 15, and four force transfer keys 15 move up and down at four power transmission grooves 7 respectively.
When rotary seal intubates 1, the cooperation transmission moment of torsion of force transfer key 15 and power transmission groove 7, torque drive is reached force transmission joint 3, drive lock claw 4 movement, seal intubate 1 and lock claw 4 there is axial displacement, lock claw 4 intubates 1 top along sealing and moves, enlarged outside diameter, locks with sealing drum 5.
Embodiment 4:
On the basis of embodiment 3, present embodiments provide the reversible high pressure sealing tieback assembly of a kind of with locking mechanism, 1 and sealing drum 5 is intubated including sealing, described sealing intubates outside 1 upper end and to be sequentially provided with regulation ring 2, force transmission joint 3 and lock claw 4 from top to bottom, force transmission joint 3 and lock claw 4 can intubate in sealing and move up and down on 1, sealing intubates 1 lower end and is provided with sealing device 6, described sealing device 6 includes three seal closures 13, screwed connection is relied between adjacent seal closure 13, described lock claw 4 is connected to 5 inner sides of sealing drum, and described sealing drum 5 bottom is sealing surface.Further, as it is shown in figure 1, the lower end of described lock claw 4 is provided with a cone 14, after lock claw 4 and sealing drum 5 lock, above proposing sealing when intubating 1, it is internal that cone 14 can support to lock claw 4 so that lock claw 4 external diameter becomes big, increases and intubates the latching force between 1 and sealing drum 5.Further, as it is shown in figure 5, described lock claw 4 is divided into 6 lobes, external diameter can expand or shrink under external force.
Embodiment 5:
On the basis of embodiment 4, present embodiments provide the reversible high pressure sealing tieback assembly of a kind of with locking mechanism, 1 and sealing drum 5 is intubated including sealing, described sealing intubates outside 1 upper end and to be sequentially provided with regulation ring 2, force transmission joint 3 and lock claw 4 from top to bottom, force transmission joint 3 and lock claw 4 can intubate in sealing and move up and down on 1, sealing intubates 1 lower end and is provided with sealing device 6, described sealing device 6 includes three seal closures 13, screwed connection is relied between adjacent seal closure 13, described lock claw 4 is connected to 5 inner sides of sealing drum, and described sealing drum 5 bottom is sealing surface.Further, intubating 1 insertion sealing drum 5 for the ease of sealing, the most described sealing device 6 lower end is set to taper, up big and down small.
Exemplified as above is only the illustration to the present invention, is not intended that the restriction to protection scope of the present invention, within the every and same or analogous design of the present invention belongs to protection scope of the present invention.
Claims (9)
1. the reversible high pressure sealing tieback assembly of a with locking mechanism, (1) and sealing drum (5) is intubated including sealing, it is characterized in that: described sealing intubates outside (1) upper end and to be sequentially provided with regulation ring (2) from top to bottom, force transmission joint (3) and lock claw (4), force transmission joint (3) and lock claw (4) can intubate in sealing and move up and down on (1), sealing intubates (1) lower end and is provided with sealing device (6), described sealing device (6) includes three seal closures (13), screwed connection is relied between adjacent seal closure (13), described lock claw (4) is connected to sealing drum (5) upper inner, described sealing drum (5) bottom is sealing surface.
The reversible high pressure sealing tieback assembly of with locking mechanism the most according to claim 1, it is characterised in that: described seal closure (13) is sequentially provided with sealing ring (8), back-up ring (9), polytetrafluoro pad one (10a), spacer ring (11), polytetrafluoro pad two (10b) from top to bottom.
The reversible high pressure sealing tieback assembly of a kind of with locking mechanism the most according to claim 1, it is characterised in that: described polytetrafluoro pad one (10a) and polytetrafluoro pad two (10b) are respectively arranged at two ends with grommet (12) up and down.
The reversible high pressure sealing tieback assembly of with locking mechanism the most according to claim 3, it is characterised in that: described grommet (12) is bowl structure.
The reversible high pressure sealing tieback assembly of with locking mechanism the most according to claim 1, it is characterised in that: described sealing intubates (1) upper outside and is circumferentially with power transmission groove (7), and power transmission groove (7) is positioned at below regulation ring (2).
The reversible high pressure sealing tieback assembly of with locking mechanism the most according to claim 1, it is characterised in that: described force transmission joint (3) internal circumferential is provided with inwardly protruded force transfer key (15), and force transfer key (15) can move up and down in power transmission groove (7).
The reversible high pressure sealing tieback assembly of with locking mechanism the most according to claim 1, it is characterised in that: described sealing intubates the lower end of (1) upper lock claw (4) and is provided with a cone (14).
The reversible high pressure sealing tieback assembly of with locking mechanism the most according to claim 1, it is characterised in that: described lock claw (4) is divided into 6 lobes.
The reversible high pressure sealing tieback assembly of with locking mechanism the most according to claim 1, it is characterised in that: described sealing device (6) lower end is set to taper, and taper is up big and down small.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610483220.3A CN105937369B (en) | 2016-06-28 | 2016-06-28 | A kind of reversible high pressure sealing tieback assembly of with locking mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610483220.3A CN105937369B (en) | 2016-06-28 | 2016-06-28 | A kind of reversible high pressure sealing tieback assembly of with locking mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN105937369A true CN105937369A (en) | 2016-09-14 |
| CN105937369B CN105937369B (en) | 2019-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610483220.3A Active CN105937369B (en) | 2016-06-28 | 2016-06-28 | A kind of reversible high pressure sealing tieback assembly of with locking mechanism |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2332807Y (en) * | 1998-03-13 | 1999-08-11 | 杜晓瑞 | High pressure sealing joint |
| CN201013255Y (en) * | 2007-03-07 | 2008-01-30 | 中国石油天然气股份有限公司 | Back-off sub |
| CN202832255U (en) * | 2012-09-22 | 2013-03-27 | 张秀梅 | Jaw-type hollow uncoupling device |
| CN103015911A (en) * | 2012-11-29 | 2013-04-03 | 中国石油集团长城钻探工程有限公司 | Articulated oil tube tie-back sealing device |
| CN203308392U (en) * | 2013-05-24 | 2013-11-27 | 中国石油化工股份有限公司 | High-pressure gas injection tubular column sealing plug |
| CN205858199U (en) * | 2016-06-28 | 2017-01-04 | 中国石油天然气股份有限公司 | A kind of novel reversible high pressure sealing tieback assembly |
-
2016
- 2016-06-28 CN CN201610483220.3A patent/CN105937369B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2332807Y (en) * | 1998-03-13 | 1999-08-11 | 杜晓瑞 | High pressure sealing joint |
| CN201013255Y (en) * | 2007-03-07 | 2008-01-30 | 中国石油天然气股份有限公司 | Back-off sub |
| CN202832255U (en) * | 2012-09-22 | 2013-03-27 | 张秀梅 | Jaw-type hollow uncoupling device |
| CN103015911A (en) * | 2012-11-29 | 2013-04-03 | 中国石油集团长城钻探工程有限公司 | Articulated oil tube tie-back sealing device |
| CN203308392U (en) * | 2013-05-24 | 2013-11-27 | 中国石油化工股份有限公司 | High-pressure gas injection tubular column sealing plug |
| CN205858199U (en) * | 2016-06-28 | 2017-01-04 | 中国石油天然气股份有限公司 | A kind of novel reversible high pressure sealing tieback assembly |
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| Publication number | Publication date |
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| CN105937369B (en) | 2019-02-15 |
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