CN101929317B - Undersize-hole oil pipe plugging device - Google Patents

Undersize-hole oil pipe plugging device Download PDF

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Publication number
CN101929317B
CN101929317B CN201010281004A CN201010281004A CN101929317B CN 101929317 B CN101929317 B CN 101929317B CN 201010281004 A CN201010281004 A CN 201010281004A CN 201010281004 A CN201010281004 A CN 201010281004A CN 101929317 B CN101929317 B CN 101929317B
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CN
China
Prior art keywords
slips
assembly
core bar
sleeve
oil pipe
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CN201010281004A
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Chinese (zh)
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CN101929317A (en
Inventor
马中原
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马中原
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Priority to CN201010281004A priority Critical patent/CN101929317B/en
Publication of CN101929317A publication Critical patent/CN101929317A/en
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Publication of CN101929317B publication Critical patent/CN101929317B/en

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Abstract

The invention relates to petroleum machinery, particularly to an oil pipe plugging device for plugging the inner hole of an oil pipe positioned below underground small-hole equipment, which comprises a core bar (1), wherein a clamping claw assembly (4), an upper slip guide taper sleeve (5), a middle connecting sleeve (6), a lower slip guide taper sleeve (7), a lower connecting sleeve (8), a jacket assembly (9) and a plug assembly (10) are sleeved on the core bar (1); and an upper slip assembly (11), an upper pressure spring (12), a lower pressure spring (13) and a lower slip assembly (14) are sleeved on the middle connecting sleeve (6). The oil pipe plugging device can be used for plugging a large-inside-diameter oil pipe positioned below thereof through the small hole of underground pipe column tools, such as a water distributor and the like, has the advantages of firm fixation in the oil pipe and high plugging reliability, can also be used for reliably plugging the underground oil pipe to prevent blowout from occurring, and ensures the normal water-well major repair operation, thereby playing roles of environmental protection and safe production, being high in use safety and more convenient to use and more beneficial to the safety of oilfield production.

Description

Undersize-hole oil pipe plugging device

Technical field

The present invention relates to petroleum machinery, particularly a kind of tubing plug that is used to stop up the oil pipe endoporus of the aperture equipment below that is positioned at the down-hole.

Background technology

When the petroleum production engineering implementation process is keeped in repair well in modern times; Need together trip out ground to water injection string together with the injection well downhole flow regulator that is used for water filling and carry out maintenance update; Be suggested in the surface process at tubing string; The stratum high pressure that long-term injecting water forms is that stratum energy can produce loss, and after maintenance was accomplished, recovering strata pressure needed high strength water filling in 60 days just can reach the needs of production at least.In the time of the stratum energy loss; Production to peripheral oil well causes very big influence; And formation waters a large amount of in maintenance process flow out ground with high pressure, cause environment pollution, and the arable land peripheral to well also can cause damage; Do not leak so press for a kind of stratum energy that can keep now, can protect the new method and the instrument of surrounding enviroment again.After the snubbing serving technology occurs, how to block the key that the oil pipe endoporus becomes this technology in the well maintenance activity process, the method that generally adopts now is:

One, the way of tubing plug shutoff; But the external diameter at tubing plug shutoff position and the internal diameter of oil pipe are wanted interference fit; Tubing plug can only arrive the upper level internal diameter of multistage injection well downhole flow regulator in the tubing string; The injection well downhole flow regulator mider hole is less than the oil pipe endoporus, and plugging device can not be through the aperture of injection well downhole flow regulator, and that is to say can't shutoff at most of tubing string below the upper level injection well downhole flow regulator.

Two, directly descend the aperture of instrument shutoff injection well downhole flow regulator, but because the specifications and models of injection well downhole flow regulator are numerous and diverse, and corroded at underground injection well downhole flow regulator sealing position for a long time, plugging effect is bad.

Three, also be employed in tubing string bottom next instrument earlier, then to the method for tubing string filling coagulating agent, but that this method is implemented is long in time limit, operation is cumbersome, cost is high, poor reliability, is inappropriate for employing.

Because down-hole pressure is very big; Reliable obstruction oil pipe also is not easy; And more scabrous be the large diameter oil pipe that little hole plug through down-hole string instruments such as injection well downhole flow regulators is positioned at its below assigned address; Blanking plug not only is not easy through aperture but also is not easy to stop up oil pipe, still belongs to insurmountable technical barrier so far.

Summary of the invention

The purpose of this invention is to provide a kind of Undersize-hole oil pipe plugging device that can be positioned at the large diameter oil pipe of its below assigned address through the little hole plug of down-hole string instruments such as injection well downhole flow regulator.

Technical solution of the present invention is: it comprises core bar; The upper end of core bar is connected with send head main body, lower end to be connected with guide head; Send on the core bar and be set with claw assembly, upper slips guiding tapered sleeve, middle adapter sleeve, lower slips guiding tapered sleeve, lower joint sleeve, sheath assembly between head main body and the guide head from the top down in order and stop up assembly; Upper slips guiding tapered sleeve, middle adapter sleeve, lower slips guiding tapered sleeve, lower joint sleeve and sheath assembly head and the tail from the top down are fixedly connected in order; Be set with upper slips assembly, compression spring, following stage clip and lower slips assembly from the top down in order on the middle adapter sleeve of position and the core bar between upper slips guiding tapered sleeve and the lower slips guiding tapered sleeve; The slips of upper slips assembly and upper slips guiding tapered sleeve are slidingly matched; The slips of lower slips assembly and lower slips guiding tapered sleeve are slidingly matched; Pass through locking steel ball axial restraint between upper slips assembly and lower slips assembly and the middle adapter sleeve respectively; Core bar is provided with two sections undergauge sections of being disengaged of axial location that when core bar is up with respect to middle adapter sleeve, can make the locking steel ball, the upper end of compression spring be pressed in upper slips assembly upper and lower end be pressed on the Ka Tai at adapter sleeve middle part, the card platform upper and lower end at adapter sleeve middle part was pressed on the lower slips assembly during the upper end of following stage clip was pressed in; Link to each other through shear pin between lower joint sleeve and the core bar, it is outside and be slidingly matched with it that the lower end slip cap of sheath assembly is contained in the upper end of stopping up assembly.

Technique effect of the present invention is: it can be positioned at the large diameter oil pipe of its below assigned address through the little hole plug of down-hole string instruments such as injection well downhole flow regulator, has fixation in oil pipe, stops up the high advantage of reliability; Thereby it can reliably block down-hole oil tube and prevent blowout; Guarantee normal well heavy repair task, thereby play the effect of protection environment and safety in production, it is safe to use; Use more conveniently, more help the safety of field produces.

It can directly arrive the bottommost of tubing string through the aperture of injection well downhole flow regulator, through the action of a series of mechanisms, water injection string is carried out effective shutoff, thereby thoroughly solve the key of snubbing serving blocking technology.

It realizes that the key of technical scheme is: 1, dual-grip assembly detent mechanism; 2, expanding is stopped up the assembly sealing mechanism; 3, double-deck distinguish sheath assembly expansion protection mechanism; 4, adjustable lock watt retaining mechanism.

This blanking plug non-action state external diameter is less than the aperture of injection well downhole flow regulator; Can arrive the bottom of tubing string smoothly, solve the problem of reliable location, 1, it has adopted spring mechanism control bi-directional slip assembly; Solved the problem of tool pressure fluctuation global failure; After this blanking plug arrives assigned address, a compulsory location is arranged, can be securely fixed on the tube inner wall; 2, solved the problem of minor diameter packing element envelope large diameter endoporus, the present invention adopts the special-shaped packing element of special hollow-core construction, and it can block the tube inner wall than its big mm more than 20 with little external diameter; 3, the present invention has adopted double-deck distinguish sheath assembly expanding packing element protective device, has solved to bear the high pressure capability problems after the packing element sealing; After packing element sealing oil pipe produced high pressure, the bearing capacity of packing element can reach 20-50MPA, is unlikely to cause the damage and the leakage of packing element, and this also is the key point of present technique; 4, it has solved the pressure variation issue in the course of work; The present invention has adopted the unsteady retaining mechanism of lock watt formula; This mechanism has guaranteed when strata pressure changes; Packing element can tighten up with the variation of strata pressure, and when pressure diminishes, continues to keep sealing state, thereby satisfies the needs in the overall process of well maintenance construction.

Problem, the packing element that this blanking plug efficiently solves small holes problem, the reliable orientation problem of instrument, minor diameter packing element shutoff large diameter oil pipe bear high pressure and do not damage and in the problem that can operate as normal, the course of work pressure change the problem of reliable shutoff.This programme is through tens of time improvement, perfect, test and improve perfect arduous process again, has finally reached desirable effect.It has implements convenient, numerous advantages such as functional reliability is high, economy, environmental protection, can bring into play irreplaceable effect in the oil producing operation in modern times.

Description of drawings

Accompanying drawing is an embodiment of the invention segmentation sectional view.

The specific embodiment

As shown in the figure; It comprises core bar 1; The upper end of core bar 1 is connected with send head main body 2, lower end to be connected with guide head 3; Send on the core bar 1 and be set with claw assembly 4, upper slips guiding tapered sleeve 5, middle adapter sleeve 6, lower slips guiding tapered sleeve 7, lower joint sleeve 8, sheath assembly 9 between head main body 2 and the guide head 3 from the top down in order and stop up assembly 10; Upper slips guiding tapered sleeve 5, middle adapter sleeve 6, lower slips guiding tapered sleeve 7, lower joint sleeve 8 and sheath assembly 9 head and the tail from the top down are fixedly connected in order; Be set with upper slips assembly 11, compression spring 12, following stage clip 13 and lower slips assembly 14 from the top down in order on the middle adapter sleeve 6 of position and the core bar 1 between upper slips guiding tapered sleeve 5 and the lower slips guiding tapered sleeve 7; The slips 15 of upper slips assembly 11 is slidingly matched with upper slips guiding tapered sleeve 5; The slips 15 of lower slips assembly 14 is slidingly matched with lower slips guiding tapered sleeve 7, and respectively through locking steel ball 16 axial restraints, core bar 1 is provided with two sections undergauge sections 17 that the axial location that locks steel ball 16 is disengaged between upper slips assembly 11 and lower slips assembly 14 and the middle adapter sleeve 6; The upper end of compression spring 12 is pressed in upper slips assembly 11 upper and lower ends and is pressed on the card platform 61 at middle adapter sleeve 6 middle parts; Card platform 61 upper and lower ends at adapter sleeve 6 middle parts were pressed on the lower slips assembly 14 during the upper end of following stage clip 13 was pressed in, and linked to each other through shear pin 81 between lower joint sleeve 8 and the core bar 1, and the lower end slip cap of sheath assembly 9 is contained in the outside, upper end of obstruction assembly 10 and is slidingly matched with it.

Send head main body 2 by rope socket 21 axially link to each other with rope socket 21 with the upper end, the lower end constitutes with the top connection body 22 that the upper end of core bar 1 links to each other; The lower end of top connection body 22 is through the top axial mutually clamping of connection steel ball 23 with core bar 1; Be provided with lower end and claw assembly 4 between top connection body 22 and the claw assembly 4 and link to each other, be sleeved on be connected with core bar 1 upper joint sleeve 24 of position of top connection body 22, top connection body 22 link to each other with the upper end of core bar 1 contact be drawn out is connected that steel ball 23 comes off behind upper joint sleeve 24 upper ends, top connection body 22 and core bar 1 can throw off.

Core bar 1 is made up of the last core bar 18, middle core bar 19 and the following core bar 20 that axially link to each other.The below of locking steel ball 16 positions between upper slips assembly 11 and lower slips assembly 14 and the middle adapter sleeve 6 on the core bar 19 during two undergauge sections 17 on the core bar 1 are located at respectively.

Claw assembly 4 constitutes by being sleeved on the claw main body 41 on the core bar 1 and the upper end upwards can be stuck between the oil pipe, the lower end is hinged respectively in claw main body 41 lower ends 3 claws 42.

Be provided with in the upper slips guiding tapered sleeve 5 and be enclosed within on the core bar 1, prevent spring 51 that core bar 1 glides automatically and lock watts 52; The lower surface upper and lower end that the upper end of spring 51 is pressed in claw assembly 4 is pressed in lock watt 52 upper ends; Lock watt 52 lower ends withstand on the lock watt seat of being located in the upper slips guiding tapered sleeve 5 53, and the outer wall of core bar 1 is provided with one section unidirectional groove 20 that matches with the unidirectional latch of locking watts 52.

Be respectively equipped with several locking steel ball holes 62 with upper slips assembly 11 and lower slips assembly 14 opposite positions on the middle adapter sleeve 6.

Upper slips assembly 11 is made up of with the slips connecting rod base 26 that is sleeved on the middle adapter sleeve 6 some (2 or 3) slips 15, some (2 or 3) slips connecting rods 25 respectively with lower slips assembly 14; One end of each slips connecting rod 25 is hinged with an end of each slips 15 respectively mutually, the other end is hinged on respectively on the slips connecting rod base 26, and the internal perisporium of each slips connecting rod base 25 is provided with locking steel ball groove 27.Each slips 15 of upper slips assembly 11 upwards is slidingly matched with the oat tail groove structure of being located on upper slips guiding tapered sleeve 5 male cone (strobilus masculinus)s respectively, and each slips 15 of lower slips assembly 14 is slidingly matched with the oat tail groove structure of being located on lower slips guiding tapered sleeve 7 male cone (strobilus masculinus)s downwards respectively.

Sheath assembly 9 is made up of pressure cap 91, inner sheath 92, oversheath 93 and sliding sleeve 94; Pressure cap 91 is contained on the core bar 1 with inner sheath 92 slip caps; Oversheath 93 is enclosed within on the inner sheath 92, the upper end of inner sheath 92 is fixed on the upper end of oversheath 93; The upper end of oversheath 93 is connected on the pressure cap 91; Outside, its upper end that sliding sleeve 94 slip caps are contained in pressure cap 91 and oversheath 93 axially link to each other with core bar 1 through the bearing pin 95 that radially is fixed on the core bar 1, also are provided with the fixed stably nail 96 that prevents that bearing pin 95 from coming off on the bearing pin 95.Inner sheath 92 is respectively lower shaft to the cylindrical body that is divided into some lobes with oversheath 93, and inner sheath 92 is identical with oversheath 93 distinguish quantity, and crossing staggering of each lobe body of inner sheath 92 and oversheath 93 blocked the slit between lobe each other.Sliding sleeve 94 can prevent that sheath assembly 9 lower going-into-well inner sheaths of following time 92 and oversheath 93 be not by damage.

Stop up assembly 10 and constitute by being sleeved on the tapered sleeve 101, packing element 102 and the fixed cover 103 that also axially link to each other on the core bar 1 from the top down in order, the lower end of fixed cover 103 and core bar 1 are fixedly connected.Packing element 102 is the big down cylindrical body that little conical through-hole for expansion arc has.This structure of packing element 102 can guarantee that it reliably blocks the endoporus of oil pipe when expanding.The top of packing element 102 is provided with the oversheath 104, the bottom that are connected with tapered sleeve 101 and is provided with the adapter sleeve 105 that is connected respectively with fixed cover 103 and core bar 1.

Blanking plug of the present invention is lowered in the down-hole oil tube through being connected in the wire rope that send on head main body 2 rope sockets 21 in use; It can need the position of arrival through the aperture arrival of each injection well downhole flow regulator in the oil pipe; Arrive behind the precalculated position through on carry wire rope to drive this blanking plug up; When the upper end of each claw 42 of claw assembly 4 is stuck in the seaming position that is connected between the oil pipe; Claw assembly 4, upper slips guiding tapered sleeve 5, middle adapter sleeve 6, lower slips guiding tapered sleeve 7, lower joint sleeve 8 and sheath assembly 9 are blocked by oil pipe through claw 42; The wire rope of carrying in the continuation makes core bar 1 by upwards pulling through rope socket 21 and top connection body 22; The shear pin 81 that is connected between lower joint sleeve 8 and the core bar 1 can be cut off; Core bar 1 drives sliding sleeve 94 through bearing pin 95 and guide head 3 and continues up with obstruction assembly 10; When two undergauge sections 17 on the core bar 1 arrived locking steel ball 16 latched positions between upper slips assembly 11 and lower slips assembly 14 and the middle adapter sleeve 6 respectively, locking steel ball 16 came off, and the axial locking with middle adapter sleeve 6 is disengaged upper slips assembly 11 with lower slips assembly 14; Compression spring 12 and following stage clip 13 with upper slips assembly 11 and lower slips assembly 14 respectively upwards with flick downwards, thereby each slips 25 of upper slips assembly 11 and lower slips assembly 14 is outwards strutted respectively upwards and is stuck on the tube inner wall securely downwards by upper slips guiding tapered sleeve 5 and lower slips guiding tapered sleeve 7 respectively.Meanwhile core bar 1 drives the tapered sleeve 101 that stops up assembly 10 and upwards slides in the inner sheath 92 that inserts sheath assembly 9 and inner sheath 92 and oversheath 93 strutted and protect in packing element 102 outsides; Packing element 102 is squeezed to expand the oil pipe endoporus is sealed simultaneously; When the lower end of top connection body 22 and core bar 1 are suggested upper joint sleeve 24 through the position that is connected steel ball 23 and is connected; Connect steel ball 23 and drop, send the be connected disengagement of head main body 22, send head main body 22 to be proposed well head by wire rope with core bar 1.

The packing element 102 that when down-hole pressure increases, stops up assembly 10 upwards receives the extruding of sheath assembly 9 to continue the inwall that radial dilatation blocks oil pipe under the effect of down-hole pressure; After strutting, the tapered sleeve 101 and the packing element 102 of the blocked assembly 10 of each lobe body of inner sheath 92 and oversheath 93 can support staggered protecting on tube inner wall on packing element 102 tops; Prevent that packing element 102 from damaging; Because core bar 1 is located at lock watts 52 in the upper slips guiding tapered sleeve 5 upwards locks and can not glide, guide head 3 can be held packing element 102 can not reduce plugging effect when down-hole pressure reduces.

Claims (9)

1. Undersize-hole oil pipe plugging device; It comprises core bar (1); The upper end of core bar (1) is connected with send head main body (2), lower end to be connected with guide head (3); It is characterized in that: send on the core bar (1) to be set with claw assembly (4), upper slips guiding tapered sleeve (5), middle adapter sleeve (6), lower slips guiding tapered sleeve (7), lower joint sleeve (8), sheath assembly (9) between head main body (2) and the guide head (3) from the top down in order and to stop up assembly (10); Upper slips guiding tapered sleeve (5), middle adapter sleeve (6), lower slips guiding tapered sleeve (7), lower joint sleeve (8) and sheath assembly (9) head and the tail from the top down are fixedly connected in order; Be set with upper slips assembly (11), compression spring (12), following stage clip (13) and lower slips assembly (14) between upper slips guiding tapered sleeve (5) and the lower slips guiding tapered sleeve (7) on the middle adapter sleeve (6) of position and the core bar (1) from the top down in order; The slips (15) of upper slips assembly (11) is slidingly matched with upper slips guiding tapered sleeve (5); The slips (15) of lower slips assembly (14) is slidingly matched with lower slips guiding tapered sleeve (7); Pass through locking steel ball (16) axial restraint between upper slips assembly (11) and lower slips assembly (14) and the middle adapter sleeve (6) respectively; Core bar (1) is provided with two sections undergauge sections (17) of being disengaged of axial location that when core bar (1) is up with respect to middle adapter sleeve (6), can make locking steel ball (16); The upper end of compression spring (12) is pressed in upper slips assembly (11) upper and lower end and is pressed on the Ka Tai (61) at middle adapter sleeve (6) middle part; Ka Tai (61) upper and lower end that the upper end of following stage clip (13) is pressed in middle adapter sleeve (6) middle part is pressed on the lower slips assembly (14); Link to each other through shear pin (81) between lower joint sleeve (8) and the core bar (1); The lower end slip cap of sheath assembly (9) is contained in the outside, upper end of obstruction assembly (10) and is slidingly matched with it, and core bar (1) is gone up and axial continuous tapered sleeve (101), packing element (102) and fixed cover (103) constitute by being sleeved in order from the top down to stop up assembly (10), and the lower end of fixed cover (103) and core bar (1) are fixedly connected.
2. Undersize-hole oil pipe plugging device as claimed in claim 1; It is characterized in that the said head main body (2) that send is made up of the top connection body (22) that rope socket (21) axially links to each other with rope socket (21) with the upper end, the lower end links to each other with the upper end of core bar (1); The lower end of top connection body (22) is through connecting the top axial clamping mutually of steel ball (23) and core bar (1), is provided with lower end and claw assembly (4) between top connection body (22) and the claw assembly (4) and links to each other, is sleeved on be connected with core bar (1) upper joint sleeve (24) of position of top connection body (22).
3. Undersize-hole oil pipe plugging device as claimed in claim 1 is characterized in that said core bar (1) is made up of the last core bar (18) that axially links to each other, middle core bar (19) and following core bar (20).
4. Undersize-hole oil pipe plugging device as claimed in claim 1 is characterized in that said claw assembly (4) is made up of 3 claws (42) that claw main body (41) and upper end upwards can be stuck between the oil pipe, the lower end is hinged respectively in claw main body (41) lower end that are sleeved on the core bar (1).
5. Undersize-hole oil pipe plugging device as claimed in claim 1; It is characterized in that being provided with in the said upper slips guiding tapered sleeve (5) and be enclosed within spring (51) that core bar (1) went up, prevented that core bar (1) from gliding automatically and lock watt (52); The lower surface upper and lower end that the upper end of spring (51) is pressed in claw assembly (4) is pressed in lock watt (52) upper end; Lock watt (52) lower end withstands on the lock watt seat of being located in the upper slips guiding tapered sleeve (5) (53), and the outer wall of core bar (1) is provided with one section unidirectional groove (20) that matches with the unidirectional latch of lock watt (52).
6. Undersize-hole oil pipe plugging device as claimed in claim 1; It is characterized in that said upper slips assembly (11) and lower slips assembly (14) are made up of some slips (15), some slips connecting rods (25) and the slips connecting rod base (26) that is sleeved on the middle adapter sleeve (6) respectively; One end of each slips connecting rod (25) is hinged with an end of each slips (15) respectively mutually, the other end is hinged on respectively on the slips connecting rod base (26), and the internal perisporium of each slips connecting rod base (25) is provided with locking steel ball groove (27).
7. Undersize-hole oil pipe plugging device as claimed in claim 1; It is characterized in that said sheath assembly (9) is made up of pressure cap (91), inner sheath (92), oversheath (93) and sliding sleeve (94); Pressure cap (91) and inner sheath (92) slip cap are contained on the core bar (1); Oversheath (93) is enclosed within on the inner sheath (92), the upper end of inner sheath (92) is fixed on the upper end of oversheath (93); The upper end of oversheath (93) is connected on the pressure cap (91); Outside, its upper end that sliding sleeve (94) slip cap is contained in pressure cap (91) and oversheath (93) axially link to each other with core bar (1) through the bearing pin (95) that radially is fixed on the core bar (1), also are provided with the fixed stably nail (96) that prevents that bearing pin (95) from coming off on the bearing pin (95).
8. Undersize-hole oil pipe plugging device as claimed in claim 7; It is characterized in that said inner sheath (92) and oversheath (93) are respectively lower shaft to the cylindrical body that is divided into some lobes; Inner sheath (92) is identical with oversheath (93) distinguish quantity, and crossing staggering of each lobe body of inner sheath (92) and oversheath (93) blocked the slit between lobe each other.
9. Undersize-hole oil pipe plugging device as claimed in claim 1 is characterized in that said packing element (102) has the cylindrical body that goes up little conical through-hole down greatly for expansion arc.
CN201010281004A 2010-09-14 2010-09-14 Undersize-hole oil pipe plugging device CN101929317B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201010281004A CN101929317B (en) 2010-09-14 2010-09-14 Undersize-hole oil pipe plugging device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201010281004A CN101929317B (en) 2010-09-14 2010-09-14 Undersize-hole oil pipe plugging device

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CN101929317A CN101929317A (en) 2010-12-29
CN101929317B true CN101929317B (en) 2012-10-10

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102493777B (en) * 2011-12-14 2014-01-01 中国石油天然气股份有限公司 Hydraulic release plugging device
CN102900385A (en) * 2012-11-06 2013-01-30 中国石油天然气股份有限公司 Over chuck distance steel wire operation slip plug
CN103775025B (en) * 2014-03-03 2017-03-01 青岛海蚨奥工贸有限公司 Sizing collar
CN104499985A (en) * 2014-10-19 2015-04-08 盐城市金巨石油机械制造有限公司 Multifunctional high-pressure oil pipe plug and use method thereof
CN104763371B (en) * 2015-02-10 2018-06-15 盐城市金巨石油机械制造有限公司 Free downslide tubing plug and its application method can be dragged for
CN105275439B (en) * 2015-10-26 2018-01-05 中国石油天然气股份有限公司 Water filling well operations hanging injection well downhole flow regulator blowout plug

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GB480579A (en) * 1937-07-22 1938-02-24 Hydril Co Improved plug for closing pipes in wells
US4545433A (en) * 1983-10-24 1985-10-08 Schlumberger Technology Corporation Reinforcing element and demand sensitive pressure intensifier for sealing a well casing
CN2773305Y (en) * 2004-10-21 2006-04-19 辽河石油勘探局 Hydraulic self sealing hole stopper with position concerned releasement
CN201027527Y (en) * 2007-04-26 2008-02-27 曹庆仁 Plugging device
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
CN201843567U (en) * 2010-09-14 2011-05-25 马中原 Tubing plug capable of passing small hole

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Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB480579A (en) * 1937-07-22 1938-02-24 Hydril Co Improved plug for closing pipes in wells
US4545433A (en) * 1983-10-24 1985-10-08 Schlumberger Technology Corporation Reinforcing element and demand sensitive pressure intensifier for sealing a well casing
CN2773305Y (en) * 2004-10-21 2006-04-19 辽河石油勘探局 Hydraulic self sealing hole stopper with position concerned releasement
CN201027527Y (en) * 2007-04-26 2008-02-27 曹庆仁 Plugging device
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
CN201843567U (en) * 2010-09-14 2011-05-25 马中原 Tubing plug capable of passing small hole

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Address before: 157000 No. 308 peony street, Xi'an District, Heilongjiang, Mudanjiang

Patentee before: Ma Zhongyuan

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