CN105484696A - Recyclable blanking plug in oil tubing - Google Patents

Recyclable blanking plug in oil tubing Download PDF

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Publication number
CN105484696A
CN105484696A CN201610050924.1A CN201610050924A CN105484696A CN 105484696 A CN105484696 A CN 105484696A CN 201610050924 A CN201610050924 A CN 201610050924A CN 105484696 A CN105484696 A CN 105484696A
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CN
China
Prior art keywords
slips
wall
mandrel
seat
fixedly installed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201610050924.1A
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Chinese (zh)
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CN105484696B (en
Inventor
朱进府
王群琪
路尧
曹华
乔书校
张春达
崔航波
单锋
李超
何文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
XINJIANG SINOPETROLEUM ENGINEERING Co Ltd
Original Assignee
XINJIANG SINOPETROLEUM ENGINEERING Co Ltd
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Application filed by XINJIANG SINOPETROLEUM ENGINEERING Co Ltd filed Critical XINJIANG SINOPETROLEUM ENGINEERING Co Ltd
Priority to CN201610050924.1A priority Critical patent/CN105484696B/en
Publication of CN105484696A publication Critical patent/CN105484696A/en
Application granted granted Critical
Publication of CN105484696B publication Critical patent/CN105484696B/en
Active legal-status Critical Current
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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/127Packers; Plugs with inflatable sleeve
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/129Packers; Plugs with mechanical slips for hooking into the casing

Abstract

The invention relates to the technical field of a blanking plug device in an oil tube and provides a recyclable blanking plug in the oil tube. The recyclable blanking plug comprises a back off sub, a fishing head, an unsetting mandrel, an upper slips barrel, a rubber packer mandrel, a lower slips seat, a lower joint, a lower mandrel and a locking pawl, wherein an upper mounting shaft cavity opening downwards is formed in the back off sub; the fishing head is arranged in the upper mounting shaft cavity in a sleeving manner, and the inner wall of the lower part of the fishing head is fixedly mounted together with the outer wall of the upper part of the unsetting mandrel; long shaft holes are formed uniformly in the circumference of the upper part of the unsetting mandrel. The blanking plug is reasonable and compact in structure and convenient to use, a steel wire running tool is used during setting and unsetting, and setting and unsetting operation is simple and feasible, larger gripping force can be provided under the condition that good plugging is guaranteed, the plug does not move after plugging, and sealing is guaranteed; meanwhile, the plug can be recycled after unsetting, can perform setting in any position in the oil tube, the plugging pressure is high, various working condition requirements are met, and the cost is reduced effectively.

Description

Blanking plug in reclaimed oil pipe
Technical field
The present invention relates to blocking device technical field in oil pipe, is blanking plug in a kind of reclaimed oil pipe.
Background technology
In Oil/gas Well well workover process, often to play lower tubular column, in order to prevent blowout, all well control equipment to be installed, long-rangely can implement moment closing well to annular space when there is overflow or blowout, but some blowouts also occurring in tubing string, is that fine thread connects because oil pipe connects, after there is overflow, installing wellhead cock sometimes has difficulties, and causes gas blowout accident.Particularly construct at carbonate reservoir, construct under being often in well killing fluid constantly leakage state during well workover, in order to equilibrium strata pressure majority adopts " cage " method, during lift pipe string, in tubing string, blowout prevention annoyings the well workover technology person of entering always, particularly when deep-well is constructed, play one-trip string often to need for a long time, the hour of danger of blowout exists, and carrying out effectively blocking when lift pipe string to bottom in tubing string is extremely urgent problem.In addition, aborning leak stopping water time also need blocking in oil pipe.Existing blanking plug in oil pipe mostly is disposable blocking, needs to bore mill or propose with tubing string when opening, and fashionablely needs special tool down, under enter after cannot reclaim, bore except trouble, adds additional operating cost.We are at the thinking of research: design a kind of with the blanking plug in oil pipe entered under steel wire, can setting shutoff in optional position, steel wire instrument can be used after operation completes to reclaim in oil pipe, recover latus rectum in oil pipe.
Summary of the invention
The invention provides blanking plug in a kind of reclaimed oil pipe, overcome the deficiency of above-mentioned prior art, its can effectively solve existing blanking plug in oil pipe complex operation, lower fashionable need special tool and under enter after cannot reclaim and problem that operating cost is high.
Technical scheme of the present invention is realized by following measures: blanking plug in a kind of reclaimed oil pipe, comprises back-off sub, fishing head, deblocking mandrel, upper slips cylinder, packing element mandrel, lower slips seat, lower contact, lower mandrel, locking pawl, there is downward opening upper installation axocoel the inside of back-off sub, fishing head is sleeved in installation axocoel, the lower inner wall of fishing head and the external wall of upper portion of deblocking mandrel are fixedly installed togather, the top of deblocking mandrel is circumferentially evenly provided with the major axis hole of at least two, deblocking mandrel below fishing head is set with upper slips seat, the top external diameter of upper slips seat is less than lower outer diameter, the middle part outer wall of upper slips seat is the upper frustum of transition upper slips seat external wall of upper portion and bottom outer wall, the top of upper slips seat is provided with the spacing hole corresponding with major axis hole, the axial length of spacing hole is less than the axial length in major axis hole, upper slips seat external wall of upper portion below spacing hole is circumferentially evenly provided with the upper protruding block of at least three, upper slips stopper slot is formed between adjacent two upper protruding blocks, in upper slips stopper slot, by upper slips ring, upper slips is installed, the lower inner wall of upper slips is for match upper conical with upper frustum, the top external diameter of upper slips is less than the lower outer diameter of upper slips, the bottom outer wall of upper slips is distributed with grappling tooth, the upper end outer wall of upper slips is provided with fixture block, upper slips jacket casing is contained on the upper slips seat below back-off sub, the hole of topping bar that the bottom of upper slips cylinder has internal diameter and upper slips top external diameter to match, correspondence top bar hole upper slips cylinder on be provided with the upper latch notch corresponding with upper fixture block, upper fixture block lays respectively in upper latch notch, upper slips cylinder above upper latch notch is installed with connecting pin, connecting pin is positioned at the top in spacing hole and major axis hole, be installed with between upper slips cylinder and upper slips seat and set pin, ring of giving up is provided with between back-off sub and upper slips seat, give up between ring and back-off sub and be fixedly installed togather by pin of giving up, upper slips seat outer wall above ring of giving up is installed with C type ring, the external diameter of C type ring is greater than the internal diameter of ring of giving up, the bottom outer wall of upper slips seat is provided with slips and connects outer groove, deblocking mandrel below upper slips seat is set with packing element assembly, the top that slips connects annular groove and packing element assembly is fixedly installed togather, the bottom of packing element assembly is provided with lower slips and installs annular groove, packing element assembly inside lower slips installation annular groove is provided with crown locking external tooth upward, the upper inside wall of lower slips seat and lower slips are installed annular groove and are fixedly installed togather, opening up installation cavity is had in the top of lower contact, the bottom of lower slips seat and the inwall of installation cavity are fixedly installed togather, there is opening up lower installation axocoel the inside of lower slips seat, what the inside of lower installation axocoel had internal diameter to reduce successively top bar hole and hole of getting out of a predicament or an embarrassing situation, lower mandrel is positioned at the bottom in hole of getting out of a predicament or an embarrassing situation, the external diameter of lower mandrel and the diameter compatible in hole of getting out of a predicament or an embarrassing situation, the bottom outer wall of deblocking mandrel and the upper inside wall of lower mandrel are fixedly installed togather, deblocking pin is installed with between lower mandrel and lower slips seat, through hole is provided with on the lower mandrel of deblocking pin in same radial line, the bottom outer wall of lower slips seat is the grappling installation annular groove that external diameter is less than lower slips seat top external diameter, it is the lower frustum that annular groove is installed in transition lower slips seat outer wall and grappling that grappling installs annular groove to the grappling lower slips seat outer wall installed above annular groove, grappling installation annular groove is circumferentially evenly provided with the lower protruding block of at least three, lower slips stopper slot is formed between adjacent two lower protruding blocks, in lower slips stopper slot, by lower slips ring, lower slips is installed, the lower outer diameter of lower slips is less than the external diameter of lower slips, the upper inside wall of lower slips is the inferior pyramidal platform that matches with lower frustum, the external wall of upper portion of lower slips is distributed with grappling tooth, the lower end outer wall of lower slips is circumferentially evenly provided with the lower fixture block of at least two, lower slips jacket casing is contained on the lower slips seat above lower contact, the hole of getting out of a predicament or an embarrassing situation that the top of lower slips cylinder has internal diameter and lower slips lower outer diameter to match, correspondence get out of a predicament or an embarrassing situation hole lower slips cylinder on be provided with the lower bayonet socket corresponding with lower fixture block, lower fixture block lays respectively in lower bayonet socket, be provided with locking pawl topping bar between hole and deblocking mandrel, locking pawl cylindrically, the lower inner wall of locking pawl is integrally fixed with land in locking, in locking below land to locking pawl top locking pawl on be intervally distributed with axial grid, the upper inside wall of locking pawl is provided with crown locking internal tooth down, and locking external tooth and locking internal tooth match.
Here is the further optimization and/or improvements to foregoing invention technical scheme:
Above-mentioned packing element assembly comprises packing element mandrel, packing element, spacer ring and connecting cylinder; The upper end outer wall of packing element mandrel is integrally fixed with connection ring set, the inwall connecting ring set is connected annular groove with slips and is fixedly installed togather, the bottom of packing element mandrel is set with connecting cylinder, the bottom outer wall of connecting cylinder is provided with lower slips and annular groove is installed, the upper inside wall that lower slips installs annular groove and lower slips seat is fixedly installed togather, and the packing element mandrel outer wall below connecting cylinder is provided with crown locking external tooth upward; Packing element mandrel between connection ring set and connecting cylinder is set with successively the packing element of at least two from top to bottom, packing element mandrel between adjacent two packing elements is set with spacer ring, the lower end outside connecting ring set is provided with conical ring platform, the upper end arranged outside of connecting cylinder has conical ring platform, being respectively arranged with conical ring platform outside the upper and lower side of spacer ring, is the conical surface matched with conical ring platform outside the two ends, upper end of packing element.
The inwall of above-mentioned connecting cylinder is provided with sealing ring, and lower slips is installed on annular groove and is provided with sealing ring, and the lower mandrel outer wall above and below deblocking pin is respectively arranged with sealing ring.
The bottom outer wall of above-mentioned upper slips distributes the grappling tooth of crown towards horizontal process; Or/and, the external wall of upper portion of lower slips distributes crown down have grappling tooth; Or/and the tapering of lower frustum is greater than the tapering of frustum.
The back-off sub of above-mentioned correspondence being installed axocoel top is circumferentially radially distributed with the balance pipe of at least one.
The lower inner wall of above-mentioned fishing head and the external wall of upper portion of deblocking mandrel are fixedly installed togather by screw thread, the bottom of lower slips seat and the inwall of installation cavity are fixedly installed togather by screw thread, the bottom outer wall of deblocking mandrel and the upper inside wall of lower mandrel are fixedly installed togather by screw thread, the inwall connecting ring set is connected annular groove with slips and is fixedly installed togather by screw thread, and the upper inside wall of lower slips seat and lower slips are installed annular groove and be fixedly installed togather by screw thread.
Reasonable and compact in structure of the present invention, easy to use, the present invention enters instrument under setting and all adopting steel wire with deblocking, and set with deblocking that operation is simple, larger snap-in force can also be provided under guarantee shutoff good situations, not move after making shutoff of the present invention, ensure sealing, meanwhile, the present invention, after deblocking completes, can reclaim, the present invention can set optional position in oil pipe, shutoff pressure is high, meets various working condition requirement, effectively reduces costs.
Accompanying drawing explanation
Accompanying drawing 1 is that the first half master of the embodiment of the present invention looks half section structural representation.
Accompanying drawing 2 is that the latter half master of the embodiment of the present invention looks half section structural representation.
Accompanying drawing 3 is that the master of locking pawl in the present invention is depending on analysing and observe structure for amplifying schematic diagram.
Accompanying drawing 4 is that the A-A of accompanying drawing 3 is to sectional structure schematic diagram.
Coding in accompanying drawing is respectively: 1 is back-off sub, 2 is upper installation axocoel, 3 is fishing head, 4 is deblocking mandrel, 5 is major axis hole, 6 is upper slips seat, 7 is upper frustum, 8 is spacing hole, 9 is upper protruding block, 10 is lower slips ring, 11 is upper slips ring, 12 is upper slips, 13 is upper conical, 14 is grappling tooth, 15 is upper fixture block, 16 is upper slips cylinder, 17 is upper latch notch, 18 is connecting pin, 19 for setting pin, 20 is ring of giving up, 21 is pin of giving up, 22 is C type ring, 23 is locking external tooth, 24 is lower slips seat, 25 is lower contact, 26 is installation cavity, 27 is lower installation axocoel, 28 is hole of topping bar, 29 is hole of getting out of a predicament or an embarrassing situation, 30 is lower mandrel, 31 is deblocking pin, 32 is grappling installation annular groove, 33 is lower frustum, 34 is lower protruding block, 35 is lower slips, 36 is inferior pyramidal platform, 37 is lower fixture block, 38 is lower slips cylinder, 39 is lower bayonet socket, 40 is locking pawl, land in 41 lockings, 42 is grid, 43 is locking internal tooth, 44 is packing element mandrel, 45 for connecting ring set, 46 is connecting cylinder, 47 is packing element, 48 is spacer ring, 49 is conical ring platform, 50 is sealing ring, 51 is balance pipe.
Detailed description of the invention
The present invention by the restriction of following embodiment, can not determine concrete embodiment according to technical scheme of the present invention and actual conditions.
In the present invention, for convenience of description, the description of the relative position relation of each parts is all be described according to the Butut mode of Figure of description 1, as: the position relationship of upper and lower, left and right etc. determines according to the Butut direction of Figure of description.
Below in conjunction with embodiment and accompanying drawing, the invention will be further described:
As shown in accompanying drawing 1,2,3, in this reclaimed oil pipe, blanking plug comprises back-off sub 1, fishing head 3, deblocking mandrel 4, upper slips cylinder 6, lower slips seat 24, lower contact 25, lower mandrel 30, locking pawl 40, there is downward opening upper installation axocoel 2 inside of back-off sub 1, fishing head 3 is sleeved in installation axocoel 2, the lower inner wall of fishing head 3 and the external wall of upper portion of deblocking mandrel 4 are fixedly installed togather, the top of deblocking mandrel 4 is circumferentially evenly provided with the major axis hole 5 of at least two, deblocking mandrel 4 below fishing head 3 is set with upper slips seat 6, the top external diameter of upper slips seat 6 is less than lower outer diameter, the middle part outer wall of upper slips seat 6 is the upper frustum 7 of transition upper slips seat 6 external wall of upper portion and bottom outer wall, the top of upper slips seat 6 is provided with the spacing hole 8 corresponding with major axis hole 5, the axial length of spacing hole 8 is less than the axial length in major axis hole 5, upper slips seat 6 external wall of upper portion below spacing hole 8 is circumferentially evenly provided with the upper protruding block 9 of at least three, upper slips stopper slot is formed between adjacent two upper protruding blocks 9, in upper slips stopper slot, by upper slips ring 11, upper slips 12 is installed, the lower inner wall of upper slips 12 is for match upper conical 13 with upper frustum 7, the top external diameter of upper slips 12 is less than the lower outer diameter of upper slips 12, the bottom outer wall of upper slips 12 is distributed with grappling tooth 14, the upper end outer wall of upper slips 12 is provided with fixture block 15, upper slips cylinder 16 is sleeved on the upper slips seat 6 below back-off sub 1, the hole of topping bar that the bottom of upper slips cylinder 16 has internal diameter and upper slips 12 top external diameter to match, correspondence top bar hole upper slips cylinder 16 on be provided with the upper latch notch 17 corresponding with upper fixture block 15, upper fixture block 15 lays respectively in upper latch notch 17, upper slips cylinder 16 above upper latch notch 17 is installed with connecting pin 18, connecting pin 18 is positioned at the top in spacing hole 8 and major axis hole 5, be installed with between upper slips cylinder 16 and upper slips seat 6 and set pin 19, ring 20 of giving up is provided with between back-off sub 1 and upper slips seat 6, give up between ring 20 and back-off sub 1 and be fixedly installed togather by pin 21 of giving up, upper slips seat 6 outer wall above ring 20 of giving up is installed with C type ring 22, the external diameter of C type ring 22 is greater than the internal diameter of ring 20 of giving up, the bottom outer wall of upper slips seat 6 is provided with slips and connects outer groove, deblocking mandrel 4 below upper slips seat 6 is set with packing element assembly, the top that slips connects annular groove and packing element assembly is fixedly installed togather,
The bottom of packing element assembly is provided with lower slips and installs annular groove, packing element assembly inside lower slips installation annular groove is provided with crown locking external tooth 23 upward, the upper inside wall of lower slips seat 24 and lower slips are installed annular groove and are fixedly installed togather, opening up installation cavity 26 is had in the top of lower contact 25, the bottom of lower slips seat 24 and the inwall of installation cavity 26 are fixedly installed togather, there is opening up lower installation axocoel 27 inside of lower slips seat 24, what the inside of lower installation axocoel 27 had internal diameter to reduce successively top bar hole 28 and hole 29 of getting out of a predicament or an embarrassing situation, lower mandrel 30 is positioned at the bottom in hole 29 of getting out of a predicament or an embarrassing situation, the external diameter of lower mandrel 30 and the diameter compatible in hole 29 of getting out of a predicament or an embarrassing situation, the bottom outer wall of deblocking mandrel 4 and the upper inside wall of lower mandrel 30 are fixedly installed togather, deblocking pin 31 is installed with between lower mandrel 30 and lower slips seat 24, through hole is provided with on the lower mandrel 30 of deblocking pin 31 in same radial line, the bottom outer wall of lower slips seat 24 is the grappling installation annular groove 32 that external diameter is less than lower slips seat 24 top external diameter, it is the lower frustum 33 that annular groove 32 is installed in transition lower slips seat 24 outer wall and grappling that annular groove 32 to grappling lower slips seat 24 outer wall installed above annular groove 32 is installed in grappling, grappling installation annular groove 32 is circumferentially evenly provided with the lower protruding block 34 of at least three, lower slips stopper slot is formed between adjacent two lower protruding blocks 34, in lower slips stopper slot, by lower slips ring 10, lower slips 35 is installed, the lower outer diameter of lower slips 35 is less than the external diameter of lower slips 35, the upper inside wall of lower slips 35 is the inferior pyramidal platform 36 that matches with lower frustum 33, the external wall of upper portion of lower slips 35 is distributed with grappling tooth 14, the lower end outer wall of lower slips 35 is circumferentially evenly provided with the lower fixture block 37 of at least two, lower slips cylinder 38 is sleeved on the lower slips seat 24 above lower contact 25, the hole of getting out of a predicament or an embarrassing situation that the top of lower slips cylinder 38 has internal diameter and lower slips 35 lower outer diameter to match, correspondence get out of a predicament or an embarrassing situation hole lower slips cylinder 38 on be provided with the lower bayonet socket 39 corresponding with lower fixture block, lower fixture block 37 lays respectively in lower bayonet socket 39, be provided with locking pawl 40 topping bar between hole and deblocking mandrel 4, locking pawl 40 cylindrically, the lower inner wall of locking pawl 40 is integrally fixed with land 41 in locking, in locking below land 41 to locking pawl 40 top locking pawl 40 on be intervally distributed with axial grid 42, the upper inside wall of locking pawl 40 is provided with crown locking internal tooth 43 down, and locking external tooth 23 and locking internal tooth 43 match.
Packing element assembly can adopt under the effect of active force above packing element assembly or/and below packing element assembly in existing known technology can the packing element device of spreading; Upper slips 12 can slide axially along upper slips seat 6 under the constraint of upper slips stopper slot and upper slips ring 11, and lower slips 35 can slide axially along lower slips seat 24 under the constraint of lower slips stopper slot and lower slips ring 10; The present invention enters under adopting steel wire instrument, and jarring sets; Salvage with steel wire instrument during deblocking, whole operation process is simple, convenient, does not need special tool(s), equipment; Locking pawl 40 in the present invention, can keep lock-out state, make packing element assembly be in compressive state all the time, ensure sealing after the compression of packing element assembly; Locking pawl 40 is flexible, and when deblocking mandrel 4 is carried, locking pawl 40 can open, and makes lockout failure; The present invention under enter to set after, upwards jarring, shears and gives up after pin 21, and back-off sub 1 proposes well head with steel wire instrument, and the present invention stays in oil pipe except the outer remainder of back-off sub 1, exposes fishing head 3 simultaneously, is beneficial to next deblocking salvage; After the present invention sets in oil pipe, deblocking mandrel 4, not by power up or down, sets reliable; During deblocking, deblocking mandrel 4 is carried, and through hole exposes, and two-way pressure balances, and instrument deblocking is reliable.
The specific embodiment of the present invention is:
When setting, blanking plug in reclaimed oil pipe of the present invention is connected with entering instrument under steel wire, when the present invention is lowered into precalculated position in well, enter instrument under steel wire to transfer fast suddenly, lower slips 35 is made to open under gravity, block tube inner wall, then jarring back-off sub 1 downwards, cut off and set pin 19, upper slips cylinder 16 and upper slips 12 are moved down, and when connecting pin 18 comes downwards to the bottom of spacing hole 8, upper slips seat 6 is driven to move down, now, connecting pin 18 is with upper slips 12, upper slips cylinder 16, upper slips seat 6 is together descending along major axis hole 5, extruding packing element assembly, locking pawl 40 locks packing element assembly under locking internal tooth 43 with the cooperation of locking external tooth 23 simultaneously simultaneously, packing element assembly is kept to be compressive state, through repeatedly jarring, the complete compression-expansion of packing element assembly can be made, space in sealing oil pipe, now, upper slips 12 and lower slips 35 are all snapped on tube inner wall, reach the object of shutoff oil pipe, after the present invention sets, upwards jarring, cut off pin 21 of giving up, back-off sub 1 proposes well head with steel wire instrument, the apparatus of the present invention except back-off sub 1 are left in oil pipe, realize oil pipe inner blocking.
During deblocking, under enter steel wire instrument, salvage after fishing head 3, upwards jarring, cut off deblocking pin 31, deblocking mandrel 4 moves, now, through hole exposes, deblocking mandrel 4 inner fluid and lower slips seat 24 external fluid are communicated, packing element assembly two-way pressure is balanced, when moving on deblocking mandrel 4 continues, lower mandrel 30 acts in the interior land 41 of locking, locking pawl 40 is outwards opened, lockout failure, the compression elasticity release of packing element assembly, continuation is carried deblocking mandrel 4, deblocking mandrel 4 drives connecting pin 18, connecting pin 18 drives on upper slips cylinder 16 and moves, make upper slips 12 deblocking, simultaneously, upper slips seat 6 moves, packing element assembly resets, communicate in oil pipe, continuation is carried deblocking mandrel 4, lower slips seat 24 moves, lower slips 35 deblocking.
According to actual needs, blanking plug in above-mentioned reclaimed oil pipe can be made further optimization and/or improvements:
As shown in accompanying drawing 1,2, packing element assembly comprises packing element mandrel 44, connecting cylinder 46, packing element 47 and spacer ring 48; The upper end outer wall of packing element mandrel 44 is integrally fixed with and connects ring set 45, the inwall connecting ring set 45 is connected annular groove with slips and is fixedly installed togather, the bottom of packing element mandrel 44 is set with connecting cylinder 46, the bottom outer wall of connecting cylinder 46 is provided with lower slips and annular groove is installed, the upper inside wall that lower slips installs annular groove and lower slips seat 24 is fixedly installed togather, and packing element mandrel 44 outer wall below connecting cylinder 46 is provided with crown locking external tooth 23 upward; Packing element mandrel 44 between connection ring set 45 and connecting cylinder 46 is set with successively the packing element 47 of at least two from top to bottom, packing element mandrel 44 between adjacent two packing elements 47 is set with spacer ring 48, the lower end outside connecting ring set 45 is provided with conical ring platform 49, the upper end arranged outside of connecting cylinder 46 has conical ring platform 49, being respectively arranged with conical ring platform 49 outside the upper and lower side of spacer ring 48, is the conical surface matched with conical ring platform 49 outside the two ends, upper end of packing element 47.Described packing element 47 is hollow rubber cylinder, it is the conical surface matched with conical ring platform 49 outside two ends, like this, the two ends of packing element 47 can coordinate after packing element 47 compression-expansion preferably with being connected ring set 45, spacer ring 48 and connecting cylinder 46, ensure that packing element 47 expands the reliability of work; When setting, upper slips seat 6 moves down, and extruding packing element mandrel 44 moves down, compression packing element 47, when in the process that packing element mandrel 44 moves down, locking pawl 40 locks packing element mandrel 44 under locking internal tooth 43 with the cooperation of locking external tooth 23 simultaneously, keeps packing element 47 in compressive state; During deblocking, after through hole exposes, deblocking mandrel 4 inner fluid and lower slips seat 24 external fluid communicate, make packing element 47 pressure balance, when moving on deblocking mandrel 4 continues, lower mandrel 30 acts in the interior land 41 of locking, locking pawl 40 is outwards opened, lockout failure, the compression elasticity release of packing element 47, packing element 47 resets.
As shown in Figure 1, the inwall of connecting cylinder 46 is provided with sealing ring 50, lower slips is installed on annular groove and is provided with sealing ring 50, and lower mandrel 30 outer wall above and below deblocking pin 31 is respectively arranged with sealing ring 50.The inwall and lower slips installation annular groove of connecting cylinder 46 arrange sealing ring 50 respectively, make connecting cylinder 46 can play the effect of slipper seal in the process moved up and down, lower mandrel 30 outer wall above and below deblocking pin 31 is respectively arranged with sealing ring 50, make lower mandrel 30 before upper moving, lower mandrel 30 and lower slips seat 24 can be sealed preferably.
As shown in accompanying drawing 1,2, the bottom outer wall of upper slips 12 distributes the grappling tooth 14 of crown towards horizontal process; Or/and, the external wall of upper portion of lower slips 35 distributes crown down have grappling tooth 14; Or/and the tapering of lower frustum 33 is greater than the tapering of frustum 7.Lower slips 35 crown is down, instantly fashionable, and blanking plug in jarring reclaimed oil pipe of the present invention, makes lower slips 35 better be engaged tube inner wall from the top down, provides larger support force for blanking plug in reclaimed oil pipe of the present invention sets; Upper slips 12 crown is level, is conducive to upper slips 12 and upper slips seat 6 moves downward, and is convenient to packing element 47 and sets; The tapering of upper frustum 7 and lower frustum 33 is different, and lower frustum 33 tapering is greater than frustum 7 tapering, is fashionablely conducive to blanking plug in reclaimed oil pipe of the present invention and sets down, is conducive to blanking plug deblocking in reclaimed oil pipe of the present invention when above carrying.
As shown in accompanying drawing 1,2, the back-off sub 1 of correspondence being installed axocoel 2 top is circumferentially radially distributed with at least one balance pipe 51.The setting of balance pipe 51 be conveniently enter under steel wire instrument press down or on carry in the process of back-off sub 1, the inside and outside fluid-phase of apparatus of the present invention can be made to be communicated with, to avoid apparatus of the present invention to build the pressure to be obstructed in implementation process and affect the course of work.
As shown in Figure 1, the lower inner wall of fishing head 3 and the external wall of upper portion of deblocking mandrel 4 are fixedly installed togather by screw thread, the bottom of lower slips seat 24 and the inwall of installation cavity 26 are fixedly installed togather by screw thread, the bottom outer wall of deblocking mandrel 4 and the upper inside wall of lower mandrel 30 are fixedly installed togather by screw thread, the inwall connecting ring set 45 is connected annular groove with slips and is fixedly installed togather by screw thread, and the upper inside wall of lower slips seat 24 and lower slips are installed annular groove and be fixedly installed togather by screw thread.Be threaded and facilitate installation and removal.
The present invention enters instrument under adopting steel wire, and when setting, downward jarring back-off sub 1 sets, and sets backward upper jarring back-off sub 1; Enter instrument during deblocking under steel wire and salvage fishing head 3, carrying directly just can deblocking, simple to operate; Locking pawl 40 in the present invention, can keep packing element 47 to compress after plugging device sets, and ensure that shutoff is good, when needs deblocking, locking pawl 40 can unlock, and packing element mandrel 44 is moved, packing element 47 resilience; The conical surface of upper slips seat 6 and lower slips seat 24 in opposite directions, namely upper slips seat 6 conical surface upwards, lower slips seat 24 conical surface is downward, centre is provided with packing element assembly, when there being pressure differential in oil pipe, and side's motion that the directional pressure that pressure is large is little, the slip spider conical surface of the side that pressure is little just struts slips, larger snap-in force is provided, does not move after making shutoff of the present invention, ensure sealing; The present invention can set optional position in oil pipe, and shutoff pressure is high, meets various working condition requirement.
Above technical characteristic constitutes embodiments of the invention, and it has stronger compliance and implementation result, can increase and decrease non-essential technical characteristic according to actual needs, meet the demand of different situations.

Claims (10)

1. a blanking plug in reclaimed oil pipe, is characterized in that comprising back-off sub, fishing head, deblocking mandrel, upper slips cylinder, packing element mandrel, lower slips seat, lower contact, lower mandrel, locking pawl, there is downward opening upper installation axocoel the inside of back-off sub, fishing head is sleeved in installation axocoel, the lower inner wall of fishing head and the external wall of upper portion of deblocking mandrel are fixedly installed togather, the top of deblocking mandrel is circumferentially evenly provided with the major axis hole of at least two, deblocking mandrel below fishing head is set with upper slips seat, the top external diameter of upper slips seat is less than lower outer diameter, the middle part outer wall of upper slips seat is the upper frustum of transition upper slips seat external wall of upper portion and bottom outer wall, the top of upper slips seat is provided with the spacing hole corresponding with major axis hole, the axial length of spacing hole is less than the axial length in major axis hole, upper slips seat external wall of upper portion below spacing hole is circumferentially evenly provided with the upper protruding block of at least three, upper slips stopper slot is formed between adjacent two upper protruding blocks, in upper slips stopper slot, by upper slips ring, upper slips is installed, the lower inner wall of upper slips is for match upper conical with upper frustum, the top external diameter of upper slips is less than the lower outer diameter of upper slips, the bottom outer wall of upper slips is distributed with grappling tooth, the upper end outer wall of upper slips is provided with fixture block, upper slips jacket casing is contained on the upper slips seat below back-off sub, the hole of topping bar that the bottom of upper slips cylinder has internal diameter and upper slips top external diameter to match, correspondence top bar hole upper slips cylinder on be provided with the upper latch notch corresponding with upper fixture block, upper fixture block lays respectively in upper latch notch, upper slips cylinder above upper latch notch is installed with connecting pin, connecting pin is positioned at the top in spacing hole and major axis hole, be installed with between upper slips cylinder and upper slips seat and set pin, ring of giving up is provided with between back-off sub and upper slips seat, give up between ring and back-off sub and be fixedly installed togather by pin of giving up, upper slips seat outer wall above ring of giving up is installed with C type ring, the external diameter of C type ring is greater than the internal diameter of ring of giving up, the bottom outer wall of upper slips seat is provided with slips and connects outer groove, deblocking mandrel below upper slips seat is set with packing element assembly, the top that slips connects annular groove and packing element assembly is fixedly installed togather, the bottom of packing element assembly is provided with lower slips and installs annular groove, packing element assembly inside lower slips installation annular groove is provided with crown locking external tooth upward, the upper inside wall of lower slips seat and lower slips are installed annular groove and are fixedly installed togather, opening up installation cavity is had in the top of lower contact, the bottom of lower slips seat and the inwall of installation cavity are fixedly installed togather, there is opening up lower installation axocoel the inside of lower slips seat, what the inside of lower installation axocoel had internal diameter to reduce successively top bar hole and hole of getting out of a predicament or an embarrassing situation, lower mandrel is positioned at the bottom in hole of getting out of a predicament or an embarrassing situation, the external diameter of lower mandrel and the diameter compatible in hole of getting out of a predicament or an embarrassing situation, the bottom outer wall of deblocking mandrel and the upper inside wall of lower mandrel are fixedly installed togather, deblocking pin is installed with between lower mandrel and lower slips seat, through hole is provided with on the lower mandrel of deblocking pin in same radial line, the bottom outer wall of lower slips seat is the grappling installation annular groove that external diameter is less than lower slips seat top external diameter, it is the lower frustum that annular groove is installed in transition lower slips seat outer wall and grappling that grappling installs annular groove to the grappling lower slips seat outer wall installed above annular groove, grappling installation annular groove is circumferentially evenly provided with the lower protruding block of at least three, lower slips stopper slot is formed between adjacent two lower protruding blocks, in lower slips stopper slot, by lower slips ring, lower slips is installed, the lower outer diameter of lower slips is less than the external diameter of lower slips, the upper inside wall of lower slips is the inferior pyramidal platform that matches with lower frustum, the external wall of upper portion of lower slips is distributed with grappling tooth, the lower end outer wall of lower slips is circumferentially evenly provided with the lower fixture block of at least two, lower slips jacket casing is contained on the lower slips seat above lower contact, the hole of getting out of a predicament or an embarrassing situation that the top of lower slips cylinder has internal diameter and lower slips lower outer diameter to match, correspondence get out of a predicament or an embarrassing situation hole lower slips cylinder on be provided with the lower bayonet socket corresponding with lower fixture block, lower fixture block lays respectively in lower bayonet socket, be provided with locking pawl topping bar between hole and deblocking mandrel, locking pawl cylindrically, the lower inner wall of locking pawl is integrally fixed with land in locking, in locking below land to locking pawl top locking pawl on be intervally distributed with axial grid, the upper inside wall of locking pawl is provided with crown locking internal tooth down, and locking external tooth and locking internal tooth match.
2. blanking plug in reclaimed oil pipe according to claim 1, is characterized in that packing element assembly comprises packing element mandrel, packing element, spacer ring and connecting cylinder; The upper end outer wall of packing element mandrel is integrally fixed with connection ring set, the inwall connecting ring set is connected annular groove with slips and is fixedly installed togather, the bottom of packing element mandrel is set with connecting cylinder, the bottom outer wall of connecting cylinder is provided with lower slips and annular groove is installed, the upper inside wall that lower slips installs annular groove and lower slips seat is fixedly installed togather, and the packing element mandrel outer wall below connecting cylinder is provided with crown locking external tooth upward; Packing element mandrel between connection ring set and connecting cylinder is set with successively the packing element of at least two from top to bottom, packing element mandrel between adjacent two packing elements is set with spacer ring, the lower end outside connecting ring set is provided with conical ring platform, the upper end arranged outside of connecting cylinder has conical ring platform, being respectively arranged with conical ring platform outside the upper and lower side of spacer ring, is the conical surface matched with conical ring platform outside the two ends, upper end of packing element.
3. blanking plug in reclaimed oil pipe according to claim 2, the inwall that it is characterized in that connecting cylinder is provided with sealing ring, lower slips is installed on annular groove and is provided with sealing ring, and the lower mandrel outer wall above and below deblocking pin is respectively arranged with sealing ring.
4. blanking plug in reclaimed oil pipe according to claim 1, the bottom outer wall that it is characterized in that upper slips distributes the grappling tooth of crown towards horizontal process; Or/and, the external wall of upper portion of lower slips distributes crown down have grappling tooth; Or/and the tapering of lower frustum is greater than the tapering of frustum.
5. blanking plug in the reclaimed oil pipe according to Claims 2 or 3, the bottom outer wall that it is characterized in that upper slips distributes the grappling tooth of crown towards horizontal process; Or/and, the external wall of upper portion of lower slips distributes crown down have grappling tooth; Or/and the tapering of lower frustum is greater than the tapering of frustum.
6. blanking plug in reclaimed oil pipe according to claim 1, is characterized in that the balance pipe corresponding upper back-off sub of installing axocoel top being circumferentially radially distributed with at least one.
7. blanking plug in the reclaimed oil pipe according to Claims 2 or 3 or 5, is characterized in that the balance pipe corresponding upper back-off sub of installing axocoel top being circumferentially radially distributed with at least one.
8. blanking plug in the reclaimed oil pipe according to Claims 2 or 3, it is characterized in that the lower inner wall of fishing head and the external wall of upper portion of deblocking mandrel are fixedly installed togather by screw thread, the bottom of lower slips seat and the inwall of installation cavity are fixedly installed togather by screw thread, the bottom outer wall of deblocking mandrel and the upper inside wall of lower mandrel are fixedly installed togather by screw thread, the inwall connecting ring set is connected annular groove with slips and is fixedly installed togather by screw thread, and the upper inside wall of lower slips seat and lower slips are installed annular groove and be fixedly installed togather by screw thread.
9. blanking plug in reclaimed oil pipe according to claim 5, it is characterized in that the lower inner wall of fishing head and the external wall of upper portion of deblocking mandrel are fixedly installed togather by screw thread, the bottom of lower slips seat and the inwall of installation cavity are fixedly installed togather by screw thread, the bottom outer wall of deblocking mandrel and the upper inside wall of lower mandrel are fixedly installed togather by screw thread, the inwall connecting ring set is connected annular groove with slips and is fixedly installed togather by screw thread, and the upper inside wall of lower slips seat and lower slips are installed annular groove and be fixedly installed togather by screw thread.
10. blanking plug in reclaimed oil pipe according to claim 7, it is characterized in that the lower inner wall of fishing head and the external wall of upper portion of deblocking mandrel are fixedly installed togather by screw thread, the bottom of lower slips seat and the inwall of installation cavity are fixedly installed togather by screw thread, the bottom outer wall of deblocking mandrel and the upper inside wall of lower mandrel are fixedly installed togather by screw thread, the inwall connecting ring set is connected annular groove with slips and is fixedly installed togather by screw thread, and the upper inside wall of lower slips seat and lower slips are installed annular groove and be fixedly installed togather by screw thread.
CN201610050924.1A 2016-01-26 2016-01-26 Blanking plug in reclaimed oil pipe Active CN105484696B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106522869A (en) * 2016-12-30 2017-03-22 新疆能新科油气技术有限公司 Shaft cast-plugging device and mounting method thereof
CN106593343A (en) * 2016-12-15 2017-04-26 中国石油天然气股份有限公司 Preset soluble casing plugging device and application method thereof
CN112360392A (en) * 2020-12-08 2021-02-12 中国石油天然气集团有限公司 Maintenance method for oil pipe plugging bridge plug and main valve of gas production tree

Citations (5)

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Publication number Priority date Publication date Assignee Title
US3460616A (en) * 1967-07-26 1969-08-12 Dresser Ind Retrievable packer
CN201539229U (en) * 2009-11-04 2010-08-04 中国石油天然气股份有限公司 Preset type oil-pipe blanking plug with snubbing service
CN202300306U (en) * 2011-08-29 2012-07-04 中国石油化工股份有限公司 Oil pipe detecting and blanking plug
CN202467753U (en) * 2011-12-14 2012-10-03 中国石油天然气股份有限公司 Blanking plug for tail tube of oil and water well
CN205577937U (en) * 2016-01-26 2016-09-14 新疆华油油气工程有限公司 But blanking plug in recovery type oil pipe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3460616A (en) * 1967-07-26 1969-08-12 Dresser Ind Retrievable packer
CN201539229U (en) * 2009-11-04 2010-08-04 中国石油天然气股份有限公司 Preset type oil-pipe blanking plug with snubbing service
CN202300306U (en) * 2011-08-29 2012-07-04 中国石油化工股份有限公司 Oil pipe detecting and blanking plug
CN202467753U (en) * 2011-12-14 2012-10-03 中国石油天然气股份有限公司 Blanking plug for tail tube of oil and water well
CN205577937U (en) * 2016-01-26 2016-09-14 新疆华油油气工程有限公司 But blanking plug in recovery type oil pipe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106593343A (en) * 2016-12-15 2017-04-26 中国石油天然气股份有限公司 Preset soluble casing plugging device and application method thereof
CN106522869A (en) * 2016-12-30 2017-03-22 新疆能新科油气技术有限公司 Shaft cast-plugging device and mounting method thereof
CN112360392A (en) * 2020-12-08 2021-02-12 中国石油天然气集团有限公司 Maintenance method for oil pipe plugging bridge plug and main valve of gas production tree
CN112360392B (en) * 2020-12-08 2022-03-04 中国石油天然气集团有限公司 Maintenance method for oil pipe plugging bridge plug and main valve of gas production tree

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