CN102444387A - Tie-back self-lock mechanism for suspended packer - Google Patents
Tie-back self-lock mechanism for suspended packer Download PDFInfo
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- CN102444387A CN102444387A CN2011104146193A CN201110414619A CN102444387A CN 102444387 A CN102444387 A CN 102444387A CN 2011104146193 A CN2011104146193 A CN 2011104146193A CN 201110414619 A CN201110414619 A CN 201110414619A CN 102444387 A CN102444387 A CN 102444387A
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Abstract
The invention discloses a tie-back self-lock mechanism for a suspended packer, which comprises a tie-back device and a self-locking device. The tie-back device comprises an upper connector, a central pipe, an elastic claw limit sleeve, an elastic claw and a tie-back inserting pipe. The self-lock device comprises a back-off connector, a tie-back barrel and a lower connector. The upper connector, the central pipe, the elastic claw limit sleeve and the tie-back inserting pipe are in threaded connection from up to down. The back-off connector, the tie-back barrel and the lower connector are in threaded connection from up to down. A ladder-shaped male buckle thread is arranged at the lower end of the elastic claw, a ladder-shaped female buckle thread matched with the elastic is arranged at the lower end of the back-off connector, the elastic claw moves up and down in the axial direction in a slide groove formed between the central pipe and the elastic claw limit sleeve, the tie-back barrel is positioned under the back-off connector, and the tie-back inserting pipe is positioned below the elastic claw. The tie-back self-lock mechanism can substitute tubular columns needing waterpower anchors to enable the tubular columns to be reliable in sealing, can pull out tie-back oil pipe strings at any time, and avoids accidents of oil-gas well engineering.
Description
Technical field
The present invention relates to the downhole tool manufacturing technology field that the well fracturing acid stimulation is transformed, exactly relate to a kind of hanging packer that is used for oil gas well underground fracture acidizing treatment and completion oil recovery gas production production and use the tieback self-locking mechanism.
Background technology
Need tool pipe strings such as hanging packer, open hole packer, pitching sliding sleeve, pressure reduction sliding sleeve be sent into the downhole designs degree of depth through drilling rod before the horizontal well bore hole staged fracturing acidizing treatment sets and hangs; Take out then and send into drilling tool; Be lowered to tieback intubate and oil pipe string; Tieback is in the tieback tube of hanging packer upper end, so that construction of follow-up fracture acidizing and later stage production oil recovery gas production.In fracture acidizing construction and in the produce hydrocarbons process, if in the pipe pressure and fluid and variation of temperature are arranged, can cause that oil pipe pipe string produces flex effect, influence the sealing of tieback intubate and tieback tube, in the time of seriously even can cause downhole tool and oil pipe damage.For fear of the appearance of the problems referred to above, the scene prevents that generally through using hydraulic anchor to be used for fixing oil pipe oil pipe is flexible.But existing hydraulic anchor leans on anchor fluke two ends pressure reduction to make anchor fluke stretch out anchoring string through the anchor fluke grappling, owing to have seal request between anchor fluke and the body, so anchor fluke is cylindrical, and the assemblage gap between anchor fluke and the body is very little.
Publication number is CN201276996Y, and the Chinese patent document that open day is on July 22nd, 2009 discloses a kind of hydraulic anchor, is made up of anchor body, anchor fluke, interstage sleeve; The anchor fluke hole is arranged on the anchor body, the reducing shoulder is arranged in the anchor fluke hole, anchor fluke is packed in the anchor body in the anchor fluke hole; Anchor fluke has with the anchor fluke hole and cooperates; The moving range of anchor fluke is end face to a reducing shoulder of anchor fluke, and interstage sleeve is installed in the inside of anchor body, and linked hole is arranged on the interstage sleeve.Gland is arranged at the interstage sleeve bottom, and gland connects with anchor body lower thread.The reducing shoulder is arranged in the anchor fluke hole, and anchor fluke is packed in the anchor body in the anchor fluke hole, in the anchor body interstage sleeve is arranged, and anchor fluke can only move within the specific limits, can not come off, and uses reliably, can prevent the anchor fluke card tubing string that comes off, and avoids oil well generation engineering accident.
But with above-mentioned patent documentation is that the prior art of representative still exists following deficiency: this hydraulic anchor in well after the long-term work owing to reasons such as corrosion, fouling, sand settings; Possibly be not easy to regain by anchor fluke on the one hand; Cause anchor fluke card tubing string, the interior tubing string of well can not be proposed, on the other hand maybe be because the seal failure between anchor fluke and the body; Cause the tubing string blow-by, cause oil gas well generation engineering accident.
Summary of the invention
For solving the problems of the technologies described above; The present invention proposes a kind of hanging packer and seal self-locking mechanism with tieback, the present invention can replace the situation that down-hole string need be lowered to hydraulic anchor, not only can trip out tieback oil pipe pipe string at any time; Also make the tubing string sealing reliable, the Oil-Gas Well Engineering accident can not take place.
The present invention realizes through adopting following technical proposals:
A kind of hanging packer is used the tieback self-locking mechanism, comprises tieback assembly and self-locking device, it is characterized in that: described tieback assembly comprises top connection, central tube, bullet pawl stop collar, plays pawl and tieback intubate; Described self-locking device comprises back-off connector, tieback tube and lower contact; Said top connection, central tube, bullet pawl stop collar and tieback intubate are from top to bottom through being threaded; Described back-off connector, tieback tube and lower contact are from top to bottom through being threaded; Play the pawl lower end and be provided with trapezoidal pin thread screw thread; Back-off connector lower end is provided with and plays the trapezoidal box screw thread of pawl coupling; Play pawl central tube with play in the chute that forms between the pawl stop collar lower slider vertically, said tieback tube is positioned under the back-off connector, the tieback intubate is positioned under the bullet pawl.
Said central tube lower end outer wall is provided with an axial limiting shoulder at least, and the axial limiting shoulder is along the axial direction setting of central tube, and stops the radially rotation of said bullet pawl on central tube.
A plurality of axial limiting shoulders are evenly distributed on the central tube lower end.
Be provided with the gap that is higher than said trapezoidal pin thread screw thread tooth depth between said central tube and the bullet pawl bottom.
The top connection external diameter of said tieback intubate is less than playing the pawl bottom diameter.
The upper end of said top connection connects oil pipe pipe string.
Compared with prior art, the beneficial effect that the present invention reached is following:
1, adopts tieback assembly of the present invention and self-locking device; Tieback string no longer need be lowered to hydraulic anchor; Make the tubing string sealing reliable; Avoid because matched in clearance seal failure between anchor fluke and the body and anchor fluke can not be regained card tubing string initiation Oil-Gas Well Engineering accident, simultaneously, when tieback string need trip out also can through on carry back-off mode trip out.
2, among the present invention, the central tube lower end is evenly distributed with the axial limiting shoulder, and restriction plays pawl and can not along the circumferential direction rotate, and can only slide along axis direction.
3, among the present invention, between central tube and the bullet pawl bottom gap that is higher than the trapezoidal thread tooth depth is arranged, make the bullet pawl that enough distortion shrink space arranged.
4, among the present invention, the top connection external diameter of tieback intubate is less than playing the pawl bottom diameter, plays the pawl lower end so that cause that the top connection of tieback intubate is filled in when carrying on the tieback string, stops to play pawl and shrink release.
Description of drawings
To combine the Figure of description and the specific embodiment that the present invention is done further detailed description below, wherein:
Fig. 1 is the structural representation of the present invention in the down-hole.
Fig. 2 is the sectional view after accompanying drawing 1 is cut open from A-A.
Mark among the figure:
1, top connection, 2, central tube, 3, play the pawl stop collar, 4, play pawl, 5, the back-off connector, 6, the tieback intubate, 7, the tieback tube, 8, lower contact, 9, chute, 10, the gap.
The specific embodiment
The invention discloses a kind of hanging packer and use the tieback self-locking mechanism, comprise tieback assembly and self-locking device, described tieback assembly comprises top connection, central tube, bullet pawl stop collar, plays pawl and tieback intubate; Described self-locking device comprises back-off connector, tieback tube and lower contact; Said top connection, central tube, bullet pawl stop collar and tieback intubate are from top to bottom through being threaded; Described back-off connector, tieback tube and lower contact are from top to bottom through being threaded; Play the pawl lower end and be provided with trapezoidal pin thread screw thread; Back-off connector lower end is provided with and plays the trapezoidal box screw thread of pawl coupling; Play pawl central tube with play in the chute that forms between the pawl stop collar lower slider vertically, said tieback tube is positioned under the back-off connector, the tieback intubate is positioned under the bullet pawl.
Preferred forms of the present invention is following:
Structure of the present invention and annexation: the present invention includes tieback assembly and self-locking device; Tieback assembly is made up of top connection 1, central tube 2, bullet pawl stop collar 3, bullet pawl 4, tieback intubate 6, and self-locking device is made up of back-off connector 5, tieback tube 7, lower contact 8; Play pawl 4 lower ends trapezoidal pin thread screw thread is arranged; Back-off connector 5 lower ends have and the trapezoidal box screw thread that plays pawl 4 couplings; Play pawl 4 can central tube 2 with play in the chute that pawl stop collar 3 forms lower slider vertically; Central tube 2 lower ends are evenly distributed with the axial limiting shoulder, and restriction plays pawl 4 and can not along the circumferential direction rotate, and can only slide along axis direction; Between central tube 2 and bullet pawl 4 bottoms gap that is higher than the trapezoidal thread tooth depth is arranged, make the bullet pawl that plays pawl 4 that enough distortion shrink space arranged; The top connection external diameter of tieback intubate 6 is less than playing pawl 4 bottom diameters, plays pawl 4 lower ends so that cause that the top connection of tieback intubate 6 is filled in when carrying on the tieback string, stops to play pawl and shrink release; Tieback tube 7 is positioned under the back-off connector 5, and tieback intubate 6 is positioned at and plays under the pawl 4; Top connection 1 in the tieback assembly, central tube 2, bullet pawl stop collar 3, tieback intubate 6 are connected through screw thread from top to bottom, and self-locking device also is connected through screw thread from top to bottom; The upper end of top connection 1 is used to connect oil pipe pipe string.
Predominant use of the present invention: the self-locking device by back-off connector 5, tieback tube 7, lower contact 8 are formed is sent into projected depth in the well by drilling rod in advance with hanging packer and downhole tool pipe string, and the hanging packer suspension trips out and sends into drilling tool after setting and giving up; Be lowered to the tieback assembly of forming by top connection 1, central tube 2, bullet pawl stop collar 3, bullet pawl 4, tieback intubate 6 with oil pipe; After tieback intubate 6 is inserted tieback tubes 7, along with tieback string continue transfer, the trapezoidal pin thread bottom of thread that plays pawl 4 lower ends can contact the trapezoidal box screw thread in the back-off connector 5; Play pawl 4 this moment and can not shrink bullet pawl insertion back-off connector 5; Move vertically after playing pawl 4 tops and being played pawl stop collar 3 and limit axially-movable but play pawl 4, play pawl 4 this moment and will shrink and play pawl, the trapezoidal pin thread screw thread in its lower end inserts in the interior trapezoidal box screw thread of back-off connector 5; Tieback string continues to transfer until playing pawl stop collar 3 lower surfaces and contacts with back-off connector 5 upper surfaces; Tieback intubate 6 is inserted tieback tube 7 fully and is realized sealing in the pipe at this moment, and the screw thread that plays simultaneously on pawl 4 and the back-off connector 5 also is combined together fully, at this moment; If on carry tieback string; The top connection of tieback intubate 6 just can be filled in and play pawl 4 lower ends, stops to play pawl contraction release, so mechanism realizes self-locking.
When needs trip out tieback string, upper lifting pipe post then, the top connection of tieback intubate 6 is filled in and is played pawl 4 lower ends; Stop and play pawl contraction release; Just going back to the adapter post then, the trapezoidal thread that play between pawl 4 and the back-off connector 5 this moment will carry out back-off, separate fully with back-off connector 5 screw threads until playing pawl 4; Tieback string is self-locking no longer, mentions tubing string on can continuing.
The present invention also can be connected on other downhole tools that need tieback, realizes the tieback sealing and the auto-lock function of tubing string.
Claims (6)
1. a hanging packer is used the tieback self-locking mechanism, comprises tieback assembly and self-locking device, it is characterized in that: described tieback assembly comprises top connection, central tube, bullet pawl stop collar, plays pawl and tieback intubate; Described self-locking device comprises back-off connector, tieback tube and lower contact; Said top connection, central tube, bullet pawl stop collar and tieback intubate are from top to bottom through being threaded; Described back-off connector, tieback tube and lower contact are from top to bottom through being threaded; Play the pawl lower end and be provided with trapezoidal pin thread screw thread; Back-off connector lower end is provided with and plays the trapezoidal box screw thread of pawl coupling; Play pawl central tube with play in the chute that forms between the pawl stop collar lower slider vertically, said tieback tube is positioned under the back-off connector, the tieback intubate is positioned under the bullet pawl.
2. hanging packer according to claim 1 is used the tieback self-locking mechanism; It is characterized in that: said central tube lower end outer wall is provided with an axial limiting shoulder at least; The axial limiting shoulder is along the axial direction setting of central tube, and stops the radially rotation of said bullet pawl on central tube.
3. hanging packer according to claim 1 is used the tieback self-locking mechanism, it is characterized in that: a plurality of axial limiting shoulders are evenly distributed on the central tube lower end.
4. use the tieback self-locking mechanism according to claim 1 or 2 or 3 described hanging packers, it is characterized in that: be provided with the gap that is higher than said trapezoidal pin thread screw thread tooth depth between said central tube and the bullet pawl bottom.
5. hanging packer according to claim 4 is used the tieback self-locking mechanism, it is characterized in that: the top connection external diameter of said tieback intubate is less than playing the pawl bottom diameter.
6. hanging packer according to claim 5 is used the tieback self-locking mechanism, it is characterized in that: the upper end of said top connection connects oil pipe pipe string.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110414619.3A CN102444387B (en) | 2011-12-13 | 2011-12-13 | Tie-back self-lock mechanism for suspended packer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110414619.3A CN102444387B (en) | 2011-12-13 | 2011-12-13 | Tie-back self-lock mechanism for suspended packer |
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| CN102444387A true CN102444387A (en) | 2012-05-09 |
| CN102444387B CN102444387B (en) | 2015-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110414619.3A Active CN102444387B (en) | 2011-12-13 | 2011-12-13 | Tie-back self-lock mechanism for suspended packer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105003227A (en) * | 2015-08-03 | 2015-10-28 | 中国石油集团川庆钻探工程有限公司 | Separable type hydraumatic sliding sleeve for oil gas well |
| CN106567688A (en) * | 2016-11-04 | 2017-04-19 | 中国石油天然气股份有限公司 | Mechanical-hydraulic hybrid setting and unsetting packer for fracturing |
| CN110145292A (en) * | 2019-05-18 | 2019-08-20 | 中国石油天然气股份有限公司 | A kind of elastic lock sleeve sanding machine |
| CN112796695A (en) * | 2021-01-26 | 2021-05-14 | 四川省威沃敦化工有限公司 | Back-inserting mechanism of split type well completion packer |
| CN113803017A (en) * | 2020-06-15 | 2021-12-17 | 中国石油化工股份有限公司 | Take orbital liner hanger |
| CN113802992A (en) * | 2020-06-12 | 2021-12-17 | 中国石油化工股份有限公司 | Back-inserting tool |
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| CN2677595Y (en) * | 2003-12-15 | 2005-02-09 | 金红玲 | Lifting hydraulic cartridge container hanger |
| CN2775289Y (en) * | 2004-04-13 | 2006-04-26 | 孔宪春 | Spring lock jaw repeat seating and sealing packer |
| US20080257560A1 (en) * | 2007-04-20 | 2008-10-23 | Brisco David P | Running Tool for Expandable Liner Hanger and Associated Methods |
| CN101881143A (en) * | 2010-07-02 | 2010-11-10 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Drillable ball injection sliding sleeve suitable for horizontal well |
| CN202370465U (en) * | 2011-12-13 | 2012-08-08 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Tieback self-locking mechanism for suspended packer |
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- 2011-12-13 CN CN201110414619.3A patent/CN102444387B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2677595Y (en) * | 2003-12-15 | 2005-02-09 | 金红玲 | Lifting hydraulic cartridge container hanger |
| CN2775289Y (en) * | 2004-04-13 | 2006-04-26 | 孔宪春 | Spring lock jaw repeat seating and sealing packer |
| US20080257560A1 (en) * | 2007-04-20 | 2008-10-23 | Brisco David P | Running Tool for Expandable Liner Hanger and Associated Methods |
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| CN202370465U (en) * | 2011-12-13 | 2012-08-08 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Tieback self-locking mechanism for suspended packer |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105003227A (en) * | 2015-08-03 | 2015-10-28 | 中国石油集团川庆钻探工程有限公司 | Separable type hydraumatic sliding sleeve for oil gas well |
| CN105003227B (en) * | 2015-08-03 | 2018-05-25 | 中国石油集团川庆钻探工程有限公司 | The detachable hydraulic sliding sleeve of oil/gas well |
| CN106567688A (en) * | 2016-11-04 | 2017-04-19 | 中国石油天然气股份有限公司 | Mechanical-hydraulic hybrid setting and unsetting packer for fracturing |
| CN106567688B (en) * | 2016-11-04 | 2019-03-08 | 中国石油天然气股份有限公司 | A kind of mixed dynamic seat solution packer of the mechanical-hydraulic for pressure break |
| CN110145292A (en) * | 2019-05-18 | 2019-08-20 | 中国石油天然气股份有限公司 | A kind of elastic lock sleeve sanding machine |
| CN113802992A (en) * | 2020-06-12 | 2021-12-17 | 中国石油化工股份有限公司 | Back-inserting tool |
| CN113803017A (en) * | 2020-06-15 | 2021-12-17 | 中国石油化工股份有限公司 | Take orbital liner hanger |
| CN112796695A (en) * | 2021-01-26 | 2021-05-14 | 四川省威沃敦化工有限公司 | Back-inserting mechanism of split type well completion packer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102444387B (en) | 2015-04-08 |
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Effective date of registration: 20200911 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Co-patentee after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Patentee after: CHINA NATIONAL PETROLEUM Corp. Address before: 610051, Sichuan Province, Chenghua District, Chengdu two ring road, paragraph 6, four North Ruifeng Lane Patentee before: DOWNHOLE OPERATION COMPANY, CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. |