CN201843567U

CN201843567U - Tubing plug capable of passing small hole

Info

Publication number: CN201843567U
Application number: CN2010205282641U
Authority: CN
Inventors: 马中原
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-09-14
Filing date: 2010-09-14
Publication date: 2011-05-25
Anticipated expiration: 2020-09-14

Abstract

The utility model relates to a petroleum machinery, in particular to a tubing plug for plugging a tubing inner hole on the lower part of small hole equipment positioned below a well. The tubing plug comprises a core rod (1). A jaw assembly (4), an upper slip guide taper sleeve (5), a middle connection sleeve (6), a lower slip guide taper sleeve (7), a lower connection sleeve (8), a sheath assembly (9) and a plugging assembly (10) are sleeved on the core rod (1). An upper slip assembly (11), an upper compression spring (12), a lower compression spring (13) and a lower slip assembly (14) are sleeved on the middle connection sleeve (6). The tubing plug can pass through a small hole of a downhole string tool such as a water distributor and the like to plug a tubing with the large inner diameter below the small hole, has the advantages of firm fixation in the tubing and high plugging reliability, can reliably plug the downhole tubing so as to prevent blowout and ensure the normal well overhauling operation, thereby playing the role of environment protection and safety production. The tubing plug has high using safety, is more convenient to use and is more beneficial to safety of oil field production.

Description

Undersize-hole oil pipe plugging device

Technical field

The utility model 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 modern petroleum production engineering implementation process is keeped in repair well, 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, after maintenance was finished, 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; arable land to the well periphery 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.How the snubbing serving technology blocks the key that the oil pipe endoporus becomes this technology in the well maintenance activity process after occurring, and the method that generally adopts is now:

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, plugging device can not be by 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 have employing in the tubing string bottom first next instrument, 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 unsuitable for adopting.

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 by 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 by 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 utility model provides a kind of Undersize-hole oil pipe plugging device that can be positioned at the large diameter oil pipe of its below assigned address by the little hole plug of down-hole string instruments such as injection well downhole flow regulator.

Technical solution of the present utility model is: it comprises core bar, the upper end of core bar is connected with send head main body, the lower end is connected with guide head, send on the core bar and be set with the claw assembly between head main body and the guide head from the top down in turn, upper slips guiding tapered sleeve, middle adapter sleeve, lower slips guiding tapered sleeve, lower joint sleeve, sheath assembly and obstruction 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 turn, be set with the upper slips assembly from the top down in turn between upper slips guiding tapered sleeve and the lower slips guiding tapered sleeve on middle adapter sleeve and the core bar, compression spring, following stage clip and lower slips assembly, 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 can make the locking steel ball when core bar is up with respect to middle adapter sleeve, the upper end of compression spring is pressed on the upper slips assembly, on the Ka Tai during the lower end is pressed in the middle part of the adapter sleeve, on the Ka Tai during the upper end of following stage clip is pressed in the middle part of the adapter sleeve, the lower end is pressed on the lower slips assembly, link to each other by 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 utility model is: it can be positioned at the large diameter oil pipe of its below assigned address by the little hole plug of down-hole string instruments such as injection well downhole flow regulator; has fixation in oil pipe; stop 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 by the aperture of injection well downhole flow regulator, by 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, solved 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 utility model 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 utility model 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 utility model 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, continue to keep sealing state, thereby satisfy 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 modern oil producing operation.

Description of drawings

Accompanying drawing is the utility model embodiment 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, the lower end is connected with guide head 3, send on the core bar 1 and be set with claw assembly 4 between head main body 2 and the guide head 3 from the top down in turn, upper slips guiding tapered sleeve 5, middle adapter sleeve 6, lower slips guiding tapered sleeve 7, lower joint sleeve 8, sheath assembly 9 and obstruction 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 turn, be set with upper slips assembly 11 from the top down in turn between upper slips guiding tapered sleeve 5 and the lower slips guiding tapered sleeve 7 on middle adapter sleeve 6 and the core bar 1, compression spring 12, following stage clip 13 and lower slips assembly 14, 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 restraints between upper slips assembly 11 and lower slips assembly 14 and the middle adapter sleeve 6 respectively, core bar 1 is provided with the undergauge section 17 that two sections axial location that can make locking steel ball 16 when core bar 1 is up with respect to middle adapter sleeve 6 are disengaged, the upper end of compression spring 12 is pressed on the upper slips assembly 11, the lower end is pressed on the card platform 61 at middle adapter sleeve 6 middle parts, the upper end of following stage clip 13 is pressed on the card platform 61 at middle adapter sleeve 6 middle parts, the lower end is pressed on the lower slips assembly 14, link to each other by shear pin 81 between lower joint sleeve 8 and the core bar 1, it is outside and be slidingly matched with it that the lower end slip cap of sheath assembly 9 is contained in the upper end of stopping up assembly 10.

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 by 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 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 and lower slips assembly 14 are made 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, one end of each slips connecting rod 25 is hinged mutually with an end of each slips 15 respectively, 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 of pressure cap 91, inner sheath 92, oversheath 93 and sliding sleeve 94, pressure cap 91 and inner sheath 92 slip caps 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 caps are contained in pressure cap 91 and oversheath 93 axially link to each other with core bar 1 by 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 and oversheath 93 are respectively lower shaft to the cylindrical body that is divided into some lobes, and inner sheath 92 is identical with oversheath 93 distinguish quantity, and each lobe body of inner sheath 92 and oversheath 93 intersects to stagger and blocks slit between lobe mutually.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 turn, 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 utility model is lowered in the down-hole oil tube by being connected in the wire rope that send on head main body 2 rope sockets 21 in use, it can arrive the position that needs arrival by the aperture of each injection well downhole flow regulator in the oil pipe, arrive behind the precalculated position by 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 by claw 42, the wire rope of carrying in the continuation is upwards spurred core bar 1 by 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 by bearing pin 95 and guide head 3 and stops up assembly 10 and continue up, when two undergauge sections 17 on the core bar 1 arrive 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 comes off, upper slips assembly 11 and lower slips assembly 14 are disengaged with the axial locking of middle adapter sleeve 6, compression spring 12 and following stage clip 13 flick upper slips assembly 11 and lower slips assembly 14 respectively up and down, thereby each slips 25 of upper slips assembly 11 and lower slips assembly 14 is outwards strutted respectively and is stuck on the tube inner wall securely up and down by upper slips guiding tapered sleeve 5 and the lower slips tapered sleeve 7 that leads respectively.Meanwhile core bar 1 drives that the tapered sleeve 101 that stops up assembly 10 upwards slides in the inner sheath 92 that inserts sheath assembly 9 and inner sheath 92 and oversheath 93 is strutted and protects 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 by the position that is connected steel ball 23 and is connected, connecting steel ball 23 drops, 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 stops up assembly 10 when down-hole pressure increases upwards is subjected to 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 of the blocked assembly 10 of each lobe body of inner sheath 92 and oversheath 93 and packing element 102 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

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), the lower end is connected with guide head (3), it is characterized in that: send on the core bar (1) between head main body (2) and the guide head (3) and be set with claw assembly (4) from the top down in turn, upper slips guiding tapered sleeve (5), middle adapter sleeve (6), lower slips guiding tapered sleeve (7), lower joint sleeve (8), sheath assembly (9) and obstruction 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 turn, middle adapter sleeve (6) and core bar (1) are gone up between upper slips guiding tapered sleeve (5) and the lower slips guiding tapered sleeve (7) and are set with upper slips assembly (11) from the top down in turn, compression spring (12), following stage clip (13) and lower slips assembly (14), 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 can make locking steel ball (16) when core bar (1) is up with respect to middle adapter sleeve (6), the upper end of compression spring (12) is pressed on the upper slips assembly (11), the lower end is pressed on the Ka Tai (61) at middle adapter sleeve (6) middle part, the upper end of following stage clip (13) is pressed on the Ka Tai (61) at middle adapter sleeve (6) middle part, the lower end is pressed on the lower slips assembly (14), link to each other by shear pin (81) between lower joint sleeve (8) and the core bar (1), it is outside and be slidingly matched with it that the lower end slip cap of sheath assembly (9) is contained in the upper end of stopping up assembly (10).

2. Undersize-hole oil pipe plugging device as claimed in claim 1, it is characterized in that the described head main body (2) that send is made 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 by 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 described core bar (1) is made 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 described claw assembly (4) is made 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 described upper slips guiding tapered sleeve (5) and be enclosed within core bar (1) and go up, prevent the spring (51) that core bar (1) glides 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 described upper slips assembly (11) and lower slips assembly (14) are made 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 mutually with an end of each slips (15) respectively, 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 described sheath assembly (9) is by pressure cap (91), inner sheath (92), oversheath (93) and sliding sleeve (94) constitute, 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), sliding sleeve (94) slip cap is contained in the outside of pressure cap (91) and oversheath (93), its upper end axially links to each other with core bar (1) by the bearing pin (95) that radially is fixed on the core bar (1), also is 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 described 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 each lobe body of inner sheath (92) and oversheath (93) intersects to stagger and blocks slit between lobe mutually.

9. the described Undersize-hole oil pipe plugging device of claim 1, it is characterized in that described obstruction assembly (10) by being sleeved on tapered sleeve (101), packing element (102) and fixed cover (103) formation that core bar (1) is gone up and axially linked to each other from the top down in turn, the lower end of fixed cover (103) and core bar (1) are fixedly connected.

10. Undersize-hole oil pipe plugging device as claimed in claim 9 is characterized in that described packing element (102) has the cylindrical body that goes up little conical through-hole down greatly for expansion arc.