CN204457583U - The tubing plug that freely glides can be dragged for - Google Patents

Abstract

The utility model discloses one and can drag for the tubing plug that freely glides, it improves on the basis of ZL201420608036.3 patent, be out of shape after utilizing pressure medium energy in down-hole oil tube to make expansion packing element pressurized, diameter increases, between expansion rubber sleeve and oil pipe endoporus, form reliable hermetically-sealed construction, realize effectively blocking oil pipe.Utilize open-top screw thread lock dog band to the feature slided, ensure that the sealing of blanking plug does not affect by ambient pressure lowers.Tiltedly carve the cooperation of formula slideway post and slider slips, realize the wall grappling with oil pipe endoporus.When needs are salvaged, as long as upwards pull fishing head, open pressure channel, utilize the pressure medium of down-hole that fishing head drive is protected on gland slideway post relative to slider slips and move, realize unlocking.Make it effectively to block oil pipe, can take out from oil pipe easily again.

Description

The tubing plug that freely glides can be dragged for

Technical field:

The utility model relates to blowout prevention plugging device in a kind of high-pressure oil pipe, particularly relates to a kind of Multifunctional oil-pipe blanking plug.

Background technology:

When oil well or water injection well carry out underground work, if there is pressure down-hole, usually need first to carry out kill-job or open flow step-down process.

For kill job, in operation process, well killing fluid produces deposit fouling shaft bottom in Well Killing Process, part even also can along hole or infiltration stratum, crack, and blocking gas channel, pollutes payzone near shaft bottom, affect stratum penetrating power, finally cause the minimizing of output and reduce recovery ratio.In addition, for low pressure oil gas well, after operation, difficulty discharged by well killing fluid, even killed by well more greatly payzone injury.Meanwhile, well killing fluid cannot be discharged ground because strata pressure is low, by other machine power, well killing fluid must be discharged ground and just can resume production, add extra mechanical effluent cost.For open flow operation, not only environmental requirement does not allow, and Local Layer pressure also can be made to reduce, and cause ground pollution.Therefore, the Operating Pressure measure of no killing well not open flow is more and more paid attention to by each oil field and promotes.

Along with the raising of field produces technical matters and the development need in oil field, down-hole Operating Pressure technology and Operating Pressure equipment have become oil field protecting field stressor layer, have not polluted stratum, do not polluted ground and have realized the important means that volume increase is stablized in oil field.

Adopt during the method for Operating Pressure and first will solve two place's problems: one is the sealing of the annular space of tubing and casing, and another is the blockage problem in oil pipe.For the sealing problem of annular space, prior art is quite ripe.And for blockage problem in oil pipe, because downhole tool is complicated and changeable, adds and be difficult to a kind of perfectly sound sealing way by the series of problems such as wax deposition fouling and Guan Bianguan leakage in oil pipe.

In order to solve the blockage problem in oil pipe, applicant is kind multifunctional high pressure tubing plug in utility model, and full and accurate in patent ZL201420608036.3 this technical scheme is disclosed, this multifunctional high pressure tubing plug structure is ingenious, can to utilize in oil pipe the pressure environment energy of self, be out of shape after making expansion packing element pressurized, diameter increases, between expansion rubber sleeve and oil pipe endoporus, form reliable hermetically-sealed construction, effectively can block oil pipe.Utilize open-top screw thread lock dog band to the feature slided, ensure that the sealing of blanking plug does not affect by ambient pressure lowers.Tiltedly carve the cooperation of formula slideway post and slider slips, realize the wall grappling with oil pipe endoporus.Therefore, in blocking process, need not manual operation, also applied external force can not realize carrying out effective shutoff to oil pipe automatically.This plugging structure can eliminate the insecure defect of oil pipe aperture error initiation shutoff simultaneously.Fool's shutoff can be realized.But it effectively can only block oil pipe, blanking plug can not be taken out from oil pipe.Once because of technological requirement aborting job, the blanking plug having knocked down oil pipe, because exiting, cannot resume production.Have to continue to trip out whole tubing string, until descend drain line to recover original state after taking out blanking plug again, reach the object of resuming production.So not only add difficulty to process choice, also can cause unnecessary waste in man-hour.Therefore, oil field more needs effectively to block oil pipe, the blanking plug that can therefrom take out easily again, has had such blanking plug just effectively can avoid the situation that cannot stop in time because of process reform to construct, has realized the object of resuming production fast.Its economic benefit and social benefit all very remarkable.

Utility model content:

The purpose of this utility model is to provide one can drag for the tubing plug that freely glides, and it improves on the basis of applicant ZL201420608036.3 patent, makes it effectively to block oil pipe, can take out from oil pipe easily again.

The technical scheme that the utility model is taked is as follows:

One can drag for the tubing plug that freely glides, and it is characterized in that: comprise non-movable piston, protects gland, movable plunger, slideway post, slider slips, fixed seating, central axis, expansion packing element, removable ring seat, opening One-way nut lock dog, shear sleeve, shear pin, ventilation adapter sleeve, Sealed casing pipe, guide head and fishing head, the upper sector hole of coaxial line and lower sector hole is provided with in the endoporus protecting gland, the hypomere sidewall protecting gland is provided with spacing slotted eye, internal thread hole is provided with in the upper surface of slideway post, the intermediate throughholes that both ends of the surface are led to is provided with at the center of slideway post, the side of slideway post is circumferentially equally provided with more than two wedged bottom chutes, in the endoporus of fixed seating, is provided with the internal thread hole of coaxial line from top to bottom successively, mating holes and axis hole, non-movable piston is screwed in the upper internal thread hole of slideway post upper end, the inner hole sleeve of movable plunger is contained on the cylindrical of non-movable piston, and by the shaft shoulder axial limiting of non-movable piston lower end, the hypomere of fishing head is hollow step cover, hypomere cylindrical is greater than epimere cylindrical, and its endoporus is divided into three sections, and hypomere is lower mating holes, stage casing is upper mating holes, and epimere is small ventilating holes, lower mating holes and upper mating holes coaxial line, small ventilating holes and upper mating holes lead to, and fishing head is sleeved in non-movable piston, wherein, upper mating holes coordinates with the cylindrical of non-movable piston, and lower mating holes matches with the cylindrical of movable plunger, protecting gland is sleeved on fishing head, and wherein go up sector hole and coordinate with the epimere cylindrical of fishing head, lower sector hole coordinates with the hypomere cylindrical of fishing head, slider slips is arranged in corresponding wedged bottom chute and spacing slotted eye respectively, and in a free state, the upper surface of slider slips is pushed down in the lower surface protecting gland, described central axis comprises connecting thread section from top to bottom, packing element section, anti-back buttless thread section, lock slots, changeover portion and piston section, fixed seating, expansion packing element, removable ring seat, opening One-way nut lock dog, shear sleeve and ventilation adapter sleeve are sleeved on setting on center shaft from top to bottom successively, wherein, fixed seating is tightened up by the nut be screwed in the connecting thread section of central axis, shear sleeve and removable ring seat spin integral, opening One-way nut lock dog rotation set is in the anti-back buttless thread section of central axis, and be positioned at the lower end of removable ring seat, the epimere of fixed seating is fixedly connected on slideway post hermetically, the upper end of Sealed casing pipe is screwed in the lower end of ventilation adapter sleeve hermetically, guide head is sealed in the lower end being screwed in Sealed casing pipe, the lock slots place that shear sleeve corresponds to central axis is circumferentially provided with equably and cuts off hole, all shear pin is housed cutting off in hole, shear pin is through cutting off hole plug-in card in lock slots, lower air vent is provided with at the center of central axis, the lower end of lower air vent interlinks with the side air vent of ventilation adapter sleeve, upper end is through the upper surface of central axis.

Further, the mode of being sealedly and fixedly connected between the epimere of fixed seating and slideway post is: fixed seating is screwed on the connection external screw thread on slideway post by the internal thread hole of epimere, be provided with seal at the mating holes of fixed seating with coordinating between cylinder, make the upper end of fixed seating realize sealing thread with slideway post lower end and be fixedly connected with.

Further, the quantity cutting off hole is 2 ~ 4, and divides equally along the circumference of shear sleeve.

Further, the side of slideway post is circumferentially equally provided with three wedged bottom chutes.

Described in the utility model drag for free downslide tubing plug using method and the course of work as follows:

When throwing stifled, above well head, connect an oil pipe short circuit, short circuit upper end sealing mounted valve, downward by guide head, protect gland direction upward, the utility model is dropped in the endoporus of oil pipe short circuit, then close the valve of short circuit upper end, when the utility model is along the free-falling of oil pipe endoporus, oil overpressure constantly increases, after the utility model drops to desired depth, high-pressure medium in oil pipe is exerted pressure to the utility model two ends, thread segment external diameter due to central axis is less than the diameter of piston section, therefore, pressure medium in oil pipe body will produce the trend of a compression to the sealed air-space in Sealed casing pipe, when the pressure differential at two ends is greater than shear pin shearing force, shear pin is cut off, Sealed casing pipe relative centre axle moves, thus drive shear sleeve, opening individual event nut lock dog, removable ring seat upwards slides together.Because the pressure medium in oil pipe body is to the effect of exerting pressure at the outside two ends of blanking plug, and slider slips is in bottom by protecting gland effect of weight, removable ring seat relative centre axle is up, drive on expansion packing element, fixed seating and slideway post and move, like this with regard to slider slips extend out to be engaged with oil pipe inner hole wall fixing, along with moving up further of Sealed casing pipe, shear sleeve, opening individual event nut lock dog, removable ring seat and expansion packing element, expansion packing element pressurized expands, by oil pipe endoporus sealing blocking.Now once open the valve of blanking plug top oil pipe, pressure in the oil pipe of blanking plug top will be released, and blanking plug bottom is because the partition of expansion packing element, pressure reduction will be produced up and down at blanking plug expansion packing element and promote Sealed casing pipe, shear sleeve, opening individual event nut lock dog, removable ring seat is up further, in the process, slider slips then can be softened, slider slips is supportted on oil pipe body inner hole wall, slideway post is stung securely solid in oil pipe body, expansion packing element after distortion and form reliable hermetically-sealed construction between oil pipe body endoporus, effectively can block the endoporus of oil pipe body, and be anchored on below bottom, even if the pressure medium in the oil pipe body of blanking plug bottom declines, because opening One-way nut lock dog has and can only upwards carry out, the feature that cannot pass downwards, removable ring seat so just can be stoped downwards to carry out, guarantee the long term seal effect of blanking plug, there will not be and affect blocking effect because Pressure Drop low bulk packing element elasticity recovers.

When the utility model takes out by needs from oil pipe, be enclosed within fishing head by specialized wire rope fishing tool, upwards tractive, fishing head is moved up, when upper side passage fishing head moving on to the central passage made in non-movable piston is to the dismounting air cavity of living between movable plunger upper end and fishing head bottom, because the pressure medium of down-hole is interlinked by the intermediate throughholes on the lower air vent of the side through hole of adapter sleeve of ventilating, central axis, slideway post and the central passage in non-movable piston, therefore pressure medium just forces on fishing head relative motion plunger and moves.Move on fishing head is under the promotion of hydraulic coupling, drive to protect on gland and move, force on the relative wedged bottom chute of slider slips and move, thus remove the locking between slider slips and tube inner wall.

It can thus be appreciated that the utility model structure is ingenious, the pressure environment energy of self can be utilized in down-hole oil tube, be out of shape after making expansion packing element pressurized, diameter increases, and forms reliable hermetically-sealed construction, effectively can block oil pipe between expansion rubber sleeve and oil pipe endoporus.Utilize open-top screw thread lock dog band to the feature slided, ensure that the sealing of blanking plug does not affect by ambient pressure lowers.Tiltedly carve the cooperation of formula slideway post and slider slips, realize the wall grappling with oil pipe endoporus.Therefore, in blocking process, need not manual operation, also applied external force can not realize carrying out effective shutoff to oil pipe automatically.This plugging structure can eliminate the insecure defect of oil pipe aperture error initiation shutoff simultaneously.The utility model not only structure is ingenious, and easy to use, low to the technical requirements of operator, can realize fool's shutoff.When needs are salvaged, as long as upwards pull fishing head, open pressure channel, be equally also utilize the pressure medium of down-hole that fishing head drive is protected on gland slideway post relative to slider slips cleverly to move, realize unlocking.

Accompanying drawing illustrates:

Fig. 1 is the structural representation of the utility model when being in commit condition;

Fig. 2 is the structural representation of fishing head;

Fig. 3 is the structural representation protecting gland;

Fig. 4 is the structural representation of fixed seating;

Fig. 5 is the structural representation of slideway post;

Fig. 6 is A-A cutaway view Amplified image in Fig. 5;

Fig. 7 is non-movable piston, protects gland, movable plunger, slideway post, assembly structure schematic diagram between slider slips and fishing head;

The structural representation of Fig. 8 central axis;

Fig. 9 is the structural representation of the utility model when being in sealed condition.

Figure 10 is the structural representation of the utility model when being in salvaging state.

In figure: 1-non-movable piston; 2-protects gland; 3-movable plunger; 4-slideway post; 5-slider slips; 6-fixed seating; 7-central axis; 8-expansion packing element; 9-removable ring seat; 10-opening One-way nut lock dog; 11-shear sleeve; 12-shear pin; 13-ventilates adapter sleeve; 14-Sealed casing pipe; 15-guide head; 16-fishing head; 17-nut; 18-side air vent;

19-sealed air-space; 20-oil pipe body; The upper sector hole of 21-; Sector hole under 22-; The spacing slotted eye of 23-; The upper internal thread hole of 41-; 42-intermediate throughholes; 43-wedged bottom chute; 44-connects external screw thread; 45-coordinates cylinder; 46-seal; 61-internal thread hole; 62-mating holes; 63-axis hole; 71-connecting thread section; 72-packing element section; 73-anti-back buttless thread section; 74-lock slots; 75-changeover portion; 76-piston section; Air vent under 77-; 161-hypomere cylindrical; 162-epimere cylindrical; Mating holes under 163-; The upper mating holes of 164-; 165-small ventilating holes; 166-dismantle compression ring; The 01-shaft shoulder; 02-central passage; 03-lateral access.

Detailed description of the invention:

Detailed description of the invention of the present utility model is described in detail below in conjunction with accompanying drawing:

Embodiment 1:

One can drag for the tubing plug that freely glides, as Figure 1-10 shows, comprise non-movable piston 1, protect gland 2, movable plunger 3, slideway post 4, slider slips 5, fixed seating 6, central axis 7, expansion packing element 8, removable ring seat 9, opening One-way nut lock dog 10, shear sleeve 11, shear pin 12, ventilation adapter sleeve 13, Sealed casing pipe 14, guide head 15 and fishing head 16, the upper sector hole 21 of coaxial line and lower sector hole 22 is provided with in the endoporus protecting gland 2, the hypomere sidewall protecting gland 2 is provided with spacing slotted eye 23, internal thread hole 41 is provided with in the upper surface of slideway post 4, the intermediate throughholes 42 that both ends of the surface are led to is provided with at the center of slideway post 4, the side of slideway post 4 is circumferentially equally provided with three wedged bottom chutes 43, the internal thread hole 61 of coaxial line is provided with from top to bottom successively in the endoporus of fixed seating 6, mating holes 62 and axis hole 63, non-movable piston 1 is screwed in the upper internal thread hole 41 of slideway post 4 upper end, the inner hole sleeve of movable plunger 3 is contained on the cylindrical of non-movable piston 1, and by the shaft shoulder 01 axial limiting of non-movable piston 1 lower end, the hypomere of fishing head 16 is hollow step cover, hypomere cylindrical 161 is greater than epimere cylindrical 162, its endoporus is divided into three sections, hypomere is lower mating holes 163, stage casing is upper mating holes 164, epimere is small ventilating holes 165, lower mating holes 163 and upper mating holes 164 coaxial line, small ventilating holes 165 and upper mating holes 164 lead to, fishing head 16 is sleeved in non-movable piston 1, wherein, upper mating holes 164 coordinates with the cylindrical of non-movable piston 1, lower mating holes 163 matches with the cylindrical of movable plunger 3, protecting gland 2 is sleeved on fishing head 16, and wherein go up sector hole 21 and coordinate with the epimere cylindrical 162 of fishing head 16, lower sector hole 22 coordinates with the hypomere cylindrical 161 of fishing head 16, slider slips 5 is arranged in corresponding wedged bottom chute 43 and spacing slotted eye 23 respectively, and in a free state, the upper surface of slider slips 5 is pushed down in the lower surface protecting gland 2, described central axis 7 comprises connecting thread section 71 from top to bottom, packing element section 72, anti-back buttless thread section 73, lock slots 74, changeover portion 75 and piston section 76, fixed seating 6, expansion packing element 8, removable ring seat 9, opening One-way nut lock dog 10, shear sleeve 11 and ventilation adapter sleeve 13 are sleeved on central axis 7 from top to bottom successively, wherein, fixed seating 6 is tightened up by the nut 17 be screwed in the connecting thread section 71 of central axis 7, shear sleeve 11 and removable ring seat 9 spin integral, opening One-way nut lock dog 10 rotation set is in the anti-back buttless thread section 73 of central axis 7, and be positioned at the lower end of removable ring seat 9, fixed seating 6 is screwed on the connection external screw thread 44 on slideway post 4 by the internal thread hole 61 of epimere, seal 46 is provided with coordinating between cylinder 45 at the mating holes 62 of fixed seating 6, make the upper end of fixed seating 6 realize sealing thread with slideway post 4 lower end to be fixedly connected with, the upper end of Sealed casing pipe 14 is screwed in the lower end of ventilation adapter sleeve 13 hermetically, guide head 15 is sealed in the lower end being screwed in Sealed casing pipe 14, lock slots 74 place that shear sleeve 11 corresponds to central axis 7 is circumferentially provided with 4 equably and cuts off hole, in each hole that cuts off, shear pin 12 is housed, shear pin 12 is through cutting off hole plug-in card in lock slots 74, lower air vent 77 is provided with at the center of central axis 7, the lower end of lower air vent 77 interlinks with the side air vent 18 of ventilation adapter sleeve 13, and upper end is through the upper surface of central axis 7.

Described in the utility model drag for free downslide tubing plug using method and the course of work as follows:

When throwing stifled, above well head, connect an oil pipe short circuit, short circuit upper end sealing mounted valve, downward by guide head 15, protect gland 2 direction upward, the utility model is dropped in the endoporus of oil pipe short circuit, then close the valve of short circuit upper end; When the utility model is along the free-falling of oil pipe endoporus, oily overpressure constantly increases, and after the utility model drops to desired depth, the high-pressure medium in oil pipe is exerted pressure to the utility model two ends, because the thread segment external diameter of central axis 7 is less than

The diameter of piston section 76, therefore, pressure medium in oil pipe body 20 will produce the trend of a compression to the sealed air-space 19 in Sealed casing pipe 14, when the pressure differential at two ends is greater than shear pin 12 shearing force, shear pin 12 is cut off, Sealed casing pipe 14 relative centre axle 7 moves, thus drives shear sleeve 11, opening individual event nut lock dog 10, removable ring seat 9 upwards to slide together.Because the pressure medium in oil pipe body 20 is to the effect of exerting pressure at the outside two ends of blanking plug, and slider slips 5 is in bottom by protecting gland 2 effect of weight, removable ring seat 9 relative centre axle 7 is up, drive on expansion packing element 8, fixed seating 6 and slideway post 4 and move, like this with regard to slider slips 5 extend out to be engaged with oil pipe inner hole wall fixing, along with moving up further of Sealed casing pipe 14, shear sleeve 11, opening individual event nut lock dog 10, removable ring seat 9 and expansion packing element 8, the sealing of oil pipe endoporus, by compression swelling, blocks by expansion packing element 8.Now once open the valve of blanking plug top oil pipe, pressure in the oil pipe of blanking plug top will be released, and blanking plug bottom is because the partition of expansion packing element 8, pressure reduction will be produced at blanking plug expansion packing element about 8 and promote Sealed casing pipe 14, shear sleeve 11, opening individual event nut lock dog 10, removable ring seat 9 is up further, in the process, slider slips then can be softened, slider slips is supportted on oil pipe body inner hole wall, slideway post is stung securely solid in oil pipe body, expansion packing element 8 after distortion and form reliable hermetically-sealed construction between oil pipe body 20 endoporus, effectively can block the endoporus of oil pipe body 20, and be anchored on below bottom, even if the pressure medium in blanking plug bottom oil pipe body 20 declines, because opening One-way nut lock dog 10 has and can only upwards carry out, the feature that cannot pass downwards, removable ring seat 9 so just can be stoped downwards to carry out, guarantee the long term seal effect of blanking plug, there will not be and affect blocking effect because Pressure Drop low bulk packing element 8 elasticity recovers.

When the utility model takes out by needs from oil pipe, be enclosed within fishing head 16 by specialized wire rope fishing tool, upwards tractive, fishing head 16 is moved up, when the upper side passage 03 fishing head 16 moving on to the central passage 02 made in non-movable piston 1 is to the dismounting air cavity of living between movable plunger 3 upper end and fishing head 16 bottom, pressure medium due to down-hole passes through the side through hole of ventilation adapter sleeve 13, the lower air vent 77 of central axis 7, intermediate throughholes 42 on slideway post 4 and the central passage 02 in non-movable piston 1 interlink, therefore pressure medium just forces on fishing head 16 relative motion plunger 3 and moves.Move on fishing head 16 is under the promotion of hydraulic coupling, drive to protect on gland 2 and move, force on the relative wedged bottom chute 43 of slider slips 5 and move, thus remove the locking between slider slips 5 and tube inner wall.

The embodiment dragging for free downslide tubing plug described in the utility model is not limited to above-described embodiment, and such as, the quantity of slider slips 5 and shear pin 12 can be arranged according to designing requirement, and the form of structure of central axis 7 such as also can to do at the change of function.As long as use all technical schemes of design principle of the present utility model all within protection domain of the present utility model.

Claims (4)

1. one kind can be dragged for the tubing plug that freely glides, it is characterized in that: comprise non-movable piston (1), protect gland (2), movable plunger (3), slideway post (4), slider slips (5), fixed seating (6), central axis (7), expansion packing element (8), removable ring seat (9), opening One-way nut lock dog (10), shear sleeve (11), shear pin (12), ventilation adapter sleeve (13), Sealed casing pipe (14), guide head (15) and fishing head (16), upper sector hole (21) and the lower sector hole (22) of coaxial line is provided with in the endoporus protecting gland (2), the hypomere sidewall protecting gland (2) is provided with spacing slotted eye (23), upper internal thread hole (41) is provided with in the upper surface of slideway post (4), the intermediate throughholes (42) that both ends of the surface are led to is provided with at the center of slideway post (4), the side of slideway post (4) is circumferentially equally provided with more than two wedged bottom chutes (43), the internal thread hole (61) of coaxial line is provided with from top to bottom successively in the endoporus of fixed seating (6), mating holes (62) and axis hole (63), non-movable piston (1) is screwed in the upper internal thread hole (41) of slideway post (4) upper end, the inner hole sleeve of movable plunger (3) is contained on the cylindrical of non-movable piston (1), and by the shaft shoulder (01) axial limiting of non-movable piston (1) lower end, the hypomere of fishing head (16) is hollow step cover, hypomere cylindrical (161) is greater than epimere cylindrical (162), its endoporus is divided into three sections, hypomere is lower mating holes (163), stage casing is upper mating holes (164), epimere is small ventilating holes (165), lower mating holes (163) and upper mating holes (164) coaxial line, small ventilating holes (165) and upper mating holes (164) lead to, fishing head (16) is sleeved in non-movable piston (1), wherein, upper mating holes (164) coordinates with the cylindrical of non-movable piston (1), lower mating holes (163) is matched with the cylindrical of movable plunger (3), protecting gland (2) is sleeved on fishing head (16), wherein go up sector hole (21) to coordinate with the epimere cylindrical (162) of fishing head (16), lower sector hole (22) coordinates with the hypomere cylindrical (161) of fishing head (16), slider slips (5) is arranged in corresponding wedged bottom chute (43) and spacing slotted eye (23) respectively, and in a free state, the upper surface of slider slips (5) is pushed down in the lower surface protecting gland (2), described central axis (7) comprises connecting thread section (71) from top to bottom, packing element section (72), anti-back buttless thread section (73), lock slots (74), changeover portion (75) and piston section (76), fixed seating (6), expansion packing element (8), removable ring seat (9), opening One-way nut lock dog (10), shear sleeve (11) and ventilation adapter sleeve (13) are sleeved on successively from top to bottom and are arranged on central axis (7), wherein, fixed seating (6) is tightened up by the nut (17) be screwed in the connecting thread section (71) of central axis (7), shear sleeve (11) and removable ring seat (9) spin integral, opening One-way nut lock dog (10) rotation set is in the anti-back buttless thread section (73) of central axis (7), and be positioned at the lower end of removable ring seat (9), the epimere of fixed seating (6) is fixedly connected on slideway post (4) hermetically, the upper end of Sealed casing pipe (14) is screwed in the lower end of ventilation adapter sleeve (13) hermetically, guide head (15) is sealed in the lower end being screwed in Sealed casing pipe (14), circumferentially be provided with equably at upper lock slots (74) place corresponding to central axis (7) of shear sleeve (11) and cut off hole, shear pin (12) is all housed cutting off in hole, shear pin (12) is through cutting off hole plug-in card in lock slots (74), lower air vent (77) is provided with at the center of central axis (7), the lower end of lower air vent (77) interlinks with the side air vent (18) of ventilation adapter sleeve (13), upper end is through the upper surface of central axis (7).

2. can drag for the tubing plug that freely glides according to claim 1, it is characterized in that: the mode of being sealedly and fixedly connected between the epimere of fixed seating (6) and slideway post (4) is: fixed seating (6) is screwed on the connection external screw thread (44) on slideway post (4) by the internal thread hole (61) of epimere, mating holes (62) in fixed seating (6) is provided with seal (46) with coordinating between cylinder (45), makes the upper end of fixed seating (6) realize sealing thread with slideway post (4) lower end and is fixedly connected with.

3. can drag for the tubing plug that freely glides according to claim 1, it is characterized in that: the quantity cutting off hole is 2 ~ 4, and divides equally along the circumference of shear sleeve (11).

4. can drag for the tubing plug that freely glides according to claim 1, it is characterized in that: on the side of slideway post (4), circumferentially equally be provided with three wedged bottom chutes (43).