CN1046777A - Removable press-fracturing bridge plug - Google Patents
Removable press-fracturing bridge plug Download PDFInfo
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- CN1046777A CN1046777A CN 89102553 CN89102553A CN1046777A CN 1046777 A CN1046777 A CN 1046777A CN 89102553 CN89102553 CN 89102553 CN 89102553 A CN89102553 A CN 89102553A CN 1046777 A CN1046777 A CN 1046777A
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Abstract
The invention discloses a kind of removable press-fracturing bridge plug that is used for oil, gas well separate stratum fracfturing.The present invention is applicable to that casing inner diameter is the well of 118.62-127.3mm, can carry out separate stratum fracfturing to any one interval, can bear more than the pressure reduction 80MPa 130 ℃ of operating temperatures.The present invention by give up, sand control, deblocking, sealing, slips anchor, locking, a seat sealing mechanism assemble, particularly adopted step-like slips, main design parameters such as its thickness, width, length and the slips angle of wedge have all reached optimal value, adopted fan-shaped lock dog to separate sealing mechanism simultaneously, guaranteed that the press-fracturing bridge plug supporting capacity is big, damage minimum to sleeve pipe, be difficult for squeezing and ruin sleeve pipe, designed unique N type rail groove simultaneously, adopt hydraulic way to carry out seat and seal, give up, it seals, gives up, salvaging, deblocking flexible movements are reliable.
Description
The present invention relates to a kind of bridging plug that is used for oil, gas well separate stratum fracfturing.
Because the oil field deeply buried reservoir, in-place permeability is low, and fracturing is an indispensable well stimulation.Because the well segment length, oil reservoir is many, and general fracturing effect is relatively poor and thick, and repeated especially fracturing effect is poorer.In order to solve this contradiction, must take separate stratum fracfturing technology.The separate stratum fracfturing tubing string that use at present domestic each oil field is mainly by hydraulic expansion formula and hydraulic compression type packer, and these two kinds of packer set technologies are simpler, can multistagely carry out separate stratum fracfturing, successively each lamination opened.But when interlayer is thicker, join relatively difficulty of packer.These two kinds of dividing potential drop tubing strings all must adopt sandblaster just can make packer sealing simultaneously, have therefore brought some unsurmountable shortcomings: aqueous fracturing fluid is sheared seriously, fracturing fluid viscosity is reduced: because the sandblast effect is easily thin with the sleeve pipe thorn, even sting disconnected; Because sandblast, sand grains is clashed into mutually, sand grains is frangible, easily causes the sand card, and packer can not deblocking etc.As adopt the method for back-up sand to carry out separate stratum fracfturing, and operation technique complexity before and after its pressure break, consuming time taking a lot of work is in case be prone to accidents such as sand plug, sand card accidentally.
Mainly adopting hydraulic anchor and slip-type packer as companies such as Halliburton, Bakes abroad at present is upper packer, and releasing device and bridging plug are formed fracturing string as lower packet.Halliburton's 3 type retrieval bridge plugs are taked mechanical system, and seat envelope needs the dextrorotation tubing string, apply tubing string weight seat envelope then, carry on behind the counter-rotating tubing string during deblocking and get final product deblocking, also will rotate tubing string when giving up.It is wider that it adapts to the orientation, but not quite suitable for heavy duty service, because of its envelope, deblocking with give up and all will rotate tubing string, so not only operating difficulties, also be not easy to judge whether seat envelope or deblocking, sometimes repeated multiple times also seat incessantly, its locking mechanism adopts " S " type rail groove, and is tighter to the burden requirement of tool seat envelope, as do not reach pre-reservation envelope load, retaining mechanism is just inoperative, and bridging plug can not seal by seat, grasps for the well of different-diameter sleeve pipe is very difficult.During operation, in the lower going-into-well, its seat envelope, deblocking all must adopt special-purpose pulling and running tool to packer several times.Though Baker Co., Ltd has a kind of dividing potential drop tubing string can one time in the lower going-into-well, its envelope, deblocking all adopt rotation tubing string mode, make troubles equally.More than the main design parameters of slips anchor of two kinds of bridging plugs all do not reach optimal value, make its supporting capacity low, in the high pressure fracturing process, easily squeeze and ruin sleeve pipe.
Purpose of the present invention is exactly to consider the shortcoming of above press-fracturing bridge plug, provide a kind of by hydraulic base sealed, give up, deblocking is convenient and reliable, it is big to bear pressure reduction, stressed uniform removable press-fracturing bridge plug.The slips anchor and the retaining mechanism of new structure particularly are provided, and open type N type rail groove, improve the sleeve stress state, prevent the fracture of slips and come off the success rate of raising separate stratum fracfturing, minimizing working strength of workers.
The invention provides a kind of slips anchor of new structure, and its overall package form changed into the form of assembling piecewise, reach the optimal design value simultaneously with the main design parameters that guarantees slips, in order to limit the position of slips anchor, a stop collar is housed simultaneously in the block and the design of positioning joint place of slips holder; Also designed novel Sand-proof leather cup mechanism, controlled opening and withdrawal of Sand-proof leather cup by the interlock of the piston of giving up, lock dog, last supporting body and sheath; Designed the lock dog of sector structure in the deblocking device, increased stress surface, bearing load is big; For preventing to squeeze bad sleeve pipe, designed spacing ring on the present envelope piston, designed the rail groove of novel open type N type structure simultaneously.
Fig. 1, be the structure chart of removable press-fracturing bridge plug.
Fig. 2, be the assembling section of the fan-shaped lock dog of removable press-fracturing bridge plug.
Fig. 3, be the N type rail groove schematic diagram of removable press-fracturing bridge plug.
Removable press-fracturing bridge plug of the present invention as Figure 1-3, by give up, sand control, deblocking, sealing, slips anchor, locking, setting mechanism assemble. Give up with sand control mechanism by top connection 1 be connected pulling tube 2, two track pin 4, the pulling mandrel 3 that has the N-type chute of two symmetries as shown in Figure 3, the piston 6 of giving up, upper supporting bodies 7 be connected with Qi Nei four lock dogs 8, Sand-proof leather cup 9 and its underpart support ring 11, sheath 10, connect sheath and the position-limitting pin of the piston of giving up 12 and two shear pins 13 of giving up form. Separating sealing mechanism is connected the joint 15 that the bottom is connected with lock tube, the individual fan-shaped lock dog 17 of 6-8 that middle supporting body 18 is connected with Qi Nei, the lock tube 16 that is connected with joint 15 by upper center tube 14, the top of deblocking shear pin 5, floating structure and forms with upper supporting body. Hermetic unit by exterior central tube 23 and be enclosed within its outside 3-5 packing element 24, and lock tube and outer in The joint 22 that core barrel connects forms. This slips anchor is intermeshing and form with stop screw 28 fixing slips support 27 and stop collars 29 by stairstepping sphenoid 25, six stairstepping slips 26, six blocks and positioning joint 30. Lock portion is made up of 4 locks watts 31, adapter sleeve 32 and its inner lower center tubes 19. The lock tube 34 that its setting mechanism is connected by lock dog by the spacing ring 33 that is connected with lower center tube, setting piston 35, release plunger 36, lower supporting body 38 and its four in-built lock dogs 37, with lower supporting body, two setting shear pins 39 and lower contact 40 form. It is 118.62-127.3mm that removable press-fracturing bridge plug of the present invention is suitable for casing inner diameter, operting differential pressure 80MPa, 130 ℃ of operating temperatures.
The slips anchor of removable press-fracturing bridge plug of the present invention is made up of sphenoid 25, slips 26, slips support 27, stop screw 28, stop collar 29, positioning joint 30, sphenoid 25 and slips 26 all are ladder-type structure, such structure has limit function, making between slips 26 and the sphenoid 25 has the fixed interval (FI), guarantees the flexible movements of slips anchor. For 15 design parameters that make the slips anchor reach optimal value, and change whole slips support into combining structure, slips support 27 is mutually meshing by six blocks and ring-type positioning joint 30, and at meshing place internal diameter to be housed be 102-106mm, external diameter is 110-114mm, height is annular stop cover 29 location of 48-52mm, with 6 stop screws slips support is tightened to an integral body simultaneously. In order to satisfy the needs of MHF, the main design parameters of slips 26 reaches optimal value simultaneously: when using internal diameter as the sleeve pipe of 118-127mm, slips sheet number is 6, the slips angle of wedge is 15 °, slip insert face length degree is 118-122mm, slips thickness is 20-24mm, and the slips width is 28-34mm. So just increase the contact area of slips and sleeve pipe, increased the intensity of slips, greatly reduced the contact stress of slips and casing wall. The embodiment of its main design parameters and similar products at home and abroad relatively, for details see attached table 1.
(subordinate list 1)
| Design parameters | Removable press-fracturing bridge plug | Y221－114 | Baker Co., Ltd | The Halliburton | |
| Slips sheet number | Sheet | 6 | 6 | 4 | 6 |
| Slips thickness | mm | 21 | 23 | 18 | 15.5 |
| The slips angle of wedge | Degree | 15 | 15 | 20 | 12 |
| Slip insert face length degree | mm | 120 | 90 | 58 | 53 |
| The slips width | mm | 32 | 30 | 40 | 18 |
Of the present invention give up and sand control mechanism by pulling tube 2, pulling mandrel 3, track pin 4, the piston 6 of giving up, go up supporting body 7, four lock dogs 8, Sand-proof leather cup 9, sheath 10, support ring 11, four position-limitting pins 12 and two shear pins 13 of giving up and form.Sand-proof leather cup 9 of the present invention is fixed on supporting body 7 lower ends, and the bottom is supported by support ring 11, and the protective jacket 10 of Sand-proof leather cup is connected as a single entity by four position-limitting pins 12 and the piston 6 of giving up.Sand-proof leather cup with give up piston 6, lock dog 8, go up supporting body 7, sheath 10 is formed a linkage structure, the opening and regain of this structure control Sand-proof leather cup.When giving up, when certain pressure acts on piston 6 upper ends of giving up, descent of piston is cut off the shear pin 13 of giving up, and drives sheath 10 and go downwards to certain position, lock dog 8 releases, and Sand-proof leather cup opens simultaneously.
The sealing mechanism of separating of bridging plug of the present invention is made up of two deblocking pins 5, upper center tube 14, joint 15, lock tube 16, a 4-8 fan-shaped lock dog 17, middle supporting body 18.Upper center tube 14 upper ends and pulling mandrel 3 are with screwed connection, and the bottom is connected for floating with middle supporting body 18, under normal condition, does not bear any load, only plays the role of positioning.Deblocking shear pin 5 is fixed together pulling mandrel 3 and last supporting body 7.Uniform 4-8 fan-shaped lock dog 17 on the circumference of middle supporting body 18, as shown in Figure 2, the cross section of lock dog 17 is a sector structure, and maximum cambered surface radius is 40-50mm, and 4-6 zigzag tooth arranged on cambered surface, the length of lock dog is 30-50mm, increased contact area like this, improved stress, whole axial loads of bridging plug in bearing the high pressure fracturing process, not only satisfied requirement of strength, also made the more reasonable compactness of mechanism.
The seat sealing mechanism of bridging plug of the present invention mainly is made up of spacing ring 33, lock tube 34, seat envelope piston 35,36,4 lock dogs 37 of release plunger, 38,2 seats envelopes of following supporting body shear pin 39.There is an annular groove release plunger 36 lower ends, by two seat envelope shear pins 39 lock tube 34 and release plunger 36 are fixed up, on the circumference of following supporting body 38, be equipped with 4 lock dogs 37 ', a spacing ring 33 is adorned in the upper end of present envelope piston, its internal diameter is 102-106mm, external diameter is 110-114mm, it highly is the metal ring of 48-52mm, it with lower center tube 19 to be threaded, its major control seat envelope piston 35, make no matter how pressure changes in the fracturing process, the seat envelope load of bridging plug maintains in certain design load all the time.
Open type N type rail groove of the present invention, see Fig. 3, it is characterized in that two symmetrical N chutes on pulling mandrel 3, leaving, the width of its opening 43 and straight trough is 21-25mm, the length 230-260mm of its straight trough, the angle 42-48 on its inclined-plane 44 °, the angle on inclined-plane 45 is 38-45 °, the angle on inclined-plane 47 is 75-85 °, and the end face of its top dead-centre 46 is the plane.The end face of this rail groove top dead-centre contacts with the planar portions of track pin 4, and its supporting capacity is big.Present seal, give up, all do not want during deblocking rotation pipeline.When going into the well, track pin 4 is in 42 positions of rail groove; When giving up, the upper lifting pipe post, track pin through straight trough slip into the outlet and break away from; When salvaging, following drain line, track pin 4 slips into blind groove 46 automatically, on carry oil pipe and can salvage.If because of certain reason need be slipped out of the hand once more, but tubing string is transferred on right rotation limit, limit, and fishing socket is thrown off once more.
The major advantage of removable press-fracturing bridge plug of the present invention is as follows:
1, bridging plug of the present invention provides novel slips anchor by the main design parameters of preferred slips anchor, has solved slips and has squeezed the key issue of ruining sleeve pipe and slips fracture, coming off.The slips anchor improves the stress in the sleeve pipe after grappling, reach to improve the anti-purpose of squeezing the maximum emergency seat envelope load of ruining of sleeve pipe, makes pressing crack construction smooth, and obtains more satisfactory economic benefit.
2, bridging plug of the present invention has adopted the structure of seat envelope piston, give up piston and open type N type rail groove, has improved the complex process of in the past rotating tubing string, makes the seat envelope, gives up and salvage convenient and reliable, and once success is easy and simple to handle, is easy to grasp.
3, bridging plug of the present invention is owing to adopted sand control mechanism, and sand grains can not enter below the leather cup, has prevented the generation of sand card accident.
The problem that packer will be lowered to several times when 4, press-fracturing bridge plug of the present invention had solved operation has realized in lower going-into-well of one-trip string, and substep seat envelope has been simplified operation sequence.
Removable press-fracturing bridge plug of the present invention is to implement like this:
Removable press-fracturing bridge plug of the present invention when pressure break can with hydraulic anchor, upper packer etc. form together fracturing string press, seal under sealing two press in the middle of or the pressing crack construction of arbitrary layer of pressure break.In bridging plug was gone into the well process, track pin 4 was on the position of the straight runner 42 of rail groove, and lock dog 8 locks together pulling tube 2 and last supporting body 7.When the seat envelope height of bridging plug down to the design well depth, in oil pipe, suppress 10MPa, pressure acts on release plunger 36 upper ends and seat envelope piston lower end by lower passage, because the effect of bottom lock dog, seat envelope piston can not be up, has only release plunger, cuts off an envelope shear pin 39 under the effect of pressure, release plunger goes downwards to certain position, makes lock dog 37 releases.Under the effect of pressure, 35 beginnings of seat envelope piston are up, promote slips holder 27, slips 26 is strutted firmly be anchored on the sleeve pipe.Simultaneously, being contained in lock that card Philippe Vatuone band saw profile of tooth buckles watts 31 closes with the zigzag buckle teeth on up and the central tube, transfer tubing string then, tube post deadweight compression packing element 24 packing oil sets annular spaces, at this moment, watt 31 continuation of band saw profile of tooth padlock are up, and this state is locked on the relevant position, keep the packing state.Continue to suppress 22MPa then, fluid power acts on piston 6 upper ends of giving up by upper channel and makes it to cut off the shear pin 13 of giving up, and goes downwards to certain position, lock dog 8 releases of locking pulling tube 2.In the descent of piston process of giving up, the sheath 10 that drives protection Sand-proof leather cup 9 by position-limitting pin 12 is descending, and Sand-proof leather cup is opened automatically, is umbrella and is attached on the casing wall.Give up simultaneously and put aside, being honored as a queen at the seat of finishing upper tool to begin pressing crack construction.
After pressure break is finished, pressure is once release, the deblocking upper tool, the recoil of tubing string limit is transferred on the limit then, fling to the removable press-fracturing bridge plug top of fish, be fixed in the track pin 4 automatic rail grooves that import on the pulling mandrel 3 on the pulling tube 2, and change to blind groove top dead-centre 46, upper lifting pipe post again along 43, drive pulling mandrel 3 by the track pin on the pulling tube 24, cut off deblocking shear pin 5, the upper center tube 14 that is connected with the pulling mandrel is also simultaneously up, when being up to certain position, and the retaining mechanism automatic unlocking in the deblocking device, it is up that upper center tube 14 drives sphenoid by lock tube 16 parts such as grade again, slips reclaims, and the seal of packing simultaneously resets the bridging plug deblocking.The upper lifting pipe post promptly proposes well head.
Claims (6)
1, a kind of oil that is used for, the removable press-fracturing bridge plug of gas well separate stratum fracfturing, it is by giving up, sand control, deblocking, sealing, the slips anchor, locking, the seat sealing mechanism assembles, it is characterized in that: the slips 26 of described slips anchor and sphenoid 25 all are ladder-type structure, the thickness of its slips 26, width, main design parameters such as the facing length and the slips angle of wedge all reach the optimal design value, and stop collar 29 is housed in slips holder outside, described giving up and the Sand-proof leather cup 9 of sand control mechanism and the piston 6 of giving up, last supporting body 7, lock dog 8, sheath 10 is formed link gear, this lock dog 17 of separating in the sealing mechanism is sector structure, a spacing ring 33 is equipped with in described seat envelope piston 35 upper ends, and described rail groove is an open type N shape structure.
2, press-fracturing bridge plug according to claim 1, it is characterized in that described slips anchor is by sphenoid 25, slips 26, slips holder 27, stop screw 28, stop collar 29, positioning joint 30 assembles, said slips 26 and sphenoid 25 all are ladder-type structure, the main design parameters of slips 26 reaches optimal value simultaneously, when using internal diameter as the sleeve pipe of 118-127mm, slips sheet number is 6, slips thickness is 20-24mm, the slips width is 28-34mm, slip insert face length degree is 118-122mm, the slips angle of wedge is 15 °, and at slips holder 27 and positioning joint 30 meshing places internal diameter being housed is 102-106mm, and height is the annular stop cover 29 of 48-52mm.
3, press-fracturing bridge plug according to claim 1, it is characterized in that, described give up and sand control mechanism in Sand-proof leather cup 9 be fixed on supporting body 7 lower ends, the bottom is supported by support ring 11, the protective jacket 10 of Sand-proof leather cup is connected as a single entity by four position-limitting pins 12 and the piston 6 of giving up, and with the piston 6 of giving up, lock dog 8, upward supporting body 7, sheath 10 are formed a linkage structure.
4, press-fracturing bridge plug according to claim 1 is characterized in that, the described cross section of separating the lock dog 17 in the sealing mechanism is a sector structure, and maximum cambered surface radius is 40-50mm, and 4-6 zigzag tooth arranged on cambered surface, and the length of lock dog is 30-50mm.
5, bridging plug according to claim 1 is characterized in that, a spacing ring 33 is equipped with in described seat envelope piston 35 upper ends, and it is that internal diameter is 102-106mm, and external diameter is 110-114mm, and height is the metal ring of 48-52mm, it with lower center tube 19 to be threaded.
6, bridging plug according to claim 1, it is characterized in that described open type N type chute, the width of its opening 43 and straight trough is 21-25mm, the length of its straight trough is 230-260mm, the angle on its inclined-plane 44 is 42-48 °, the angle on inclined-plane 45 is 38-45 °, and the angle on inclined-plane 47 is 75-85 °, and the end face of its top dead-centre 46 is the plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102553 CN1018191B (en) | 1989-04-26 | 1989-04-26 | Removable press-fracturing bridge plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102553 CN1018191B (en) | 1989-04-26 | 1989-04-26 | Removable press-fracturing bridge plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1046777A true CN1046777A (en) | 1990-11-07 |
| CN1018191B CN1018191B (en) | 1992-09-09 |
Family
ID=4854787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89102553 Expired CN1018191B (en) | 1989-04-26 | 1989-04-26 | Removable press-fracturing bridge plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1018191B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337860A (en) * | 2010-09-03 | 2012-02-01 | 中国石油大学(北京) | Packer |
| CN104989320A (en) * | 2015-07-17 | 2015-10-21 | 牡丹江市井田石油钻采配件有限公司 | Sliding way type releasing bridge plug |
| CN109209292A (en) * | 2018-11-29 | 2019-01-15 | 友链（北京）信息咨询有限责任公司 | A kind of recyclable through tubing bridge plug of high divergence ratio |
-
1989
- 1989-04-26 CN CN 89102553 patent/CN1018191B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337860A (en) * | 2010-09-03 | 2012-02-01 | 中国石油大学(北京) | Packer |
| CN102337860B (en) * | 2010-09-03 | 2014-04-16 | 中国石油大学(北京) | Packer |
| CN104989320A (en) * | 2015-07-17 | 2015-10-21 | 牡丹江市井田石油钻采配件有限公司 | Sliding way type releasing bridge plug |
| CN104989320B (en) * | 2015-07-17 | 2017-07-07 | 牡丹江市井田石油钻采配件有限公司 | Chute type sub-releasing axle plug |
| CN109209292A (en) * | 2018-11-29 | 2019-01-15 | 友链（北京）信息咨询有限责任公司 | A kind of recyclable through tubing bridge plug of high divergence ratio |
| CN109209292B (en) * | 2018-11-29 | 2024-03-22 | 弗润联科(北京)石油科技有限公司 | Recoverable oil pipe bridge plug with high expansion ratio |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1018191B (en) | 1992-09-09 |
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