CN208966261U - Removable bridge plug - Google Patents

Abstract

The utility model provides a removable bridge plug, belonging to the field of oil and gas well sealing equipment, comprising an inner cylinder body, a ball seat, an outer cylinder body, a plugging ball, a baffle plate and a bridge plug main body; the upper end of the inner cylinder body is inserted into the outer cylinder body, and the lower end of the inner cylinder body is detachably connected with the bridge plug main body; the ball seat is arranged in the inner barrel body from the upper end of the inner barrel body, a first cavity is arranged in the ball seat, a first opening is formed in the top of the first cavity, a second opening is formed in the bottom of the first cavity, and a blocking ball used for sealing the second opening is arranged in the first cavity; the baffle sets up and is used for the first opening of shutoff in the urceolus, and the baffle is provided with a plurality of through-holes with first cavity intercommunication, and the aperture of through-hole is less than the diameter of shutoff ball. The utility model provides a can get formula bridging plug passes through the baffle with the shutoff ball restriction in the ball seat for when solving can get formula bridging plug and using in horizontal well and viscous crude well, make can get formula bridging plug accomplish the shutoff work of pit shaft.

Description

Detachable bridge plug

Technical field

The utility model relates to oil/gas well sealing device field more particularly to a kind of detachable bridge plugs.

Background technique

Bridge plug is that have the characteristics that working procedure is few, the period is short, card envelope position is accurate for oil/gas well sealing, general point For permanent type bridge plug and two kinds of detachable bridge plug.

Wherein, detachable bridge plug is mainly made of setting mechanism, anchor mechanism, sealing mechanism etc., is widely used in formation testing, is repaired Lower part well section is blocked when the constructions such as well, test, oil-gas Layer transformation.When using detachable bridge plug, using tubing string by detachable bridge plug It is sent into the predetermined position of pit shaft, the ball sealer of sealing is then put into detachable bridge plug by tubing string again, is beaten later Work is pressed, can realize that bridge plug sets and gives up, and then completes the closure to pit shaft.

But when detachable bridge plug in horizontal well and heavy oil wells in use, its effect is with regard to not satisfactory because when desirable When formula bridge plug is lowered into the predetermined position of pit shaft, hole deviation is excessive or tubing string in fluid it is feeding-up etc. due to, put into ball sealer It can not be successfully the opening for reaching ball seat, the opening of ball seat can not be sealed, cause to block pit shaft using detachable bridge plug Work be unable to complete successfully.

Utility model content

The utility model provides a kind of detachable bridge plug, carries out ball sealer smoothly in place and to the opening of ball seat close Envelope, smoothly completes the closure to pit shaft.

To achieve the goals above, the utility model adopts the following technical solution:

On the one hand the utility model provides a kind of detachable bridge plug, including inner cylinder, ball seat, outer barrel, ball sealer, gear Plate and bridge plug main body；The upper end of the inner cylinder is inserted into the outer barrel, the lower end of the inner cylinder and the bridge plug master Body is detachably connected；The ball seat is mounted in the inner cylinder from the upper end of the inner cylinder, and the ball seat is internally provided with First cavity, the top of first cavity are equipped with the first opening, and the bottom of first cavity is equipped with the second opening, and described The ball sealer for sealing second opening is provided in first cavity；The baffle plate setting is in outer barrel for blocking institute The first opening is stated, and the baffle plate setting there are multiple through-holes being connected to first cavity, the aperture of the through-hole is less than institute State the diameter of ball sealer.

Compared with prior art, a kind of detachable bridge plug provided by the utility model has the following advantages that；

Detachable bridge plug provided by the utility model comprising inner cylinder, ball seat, outer barrel, ball seat is from inner cylinder Upper end is mounted in inner cylinder, and ball seat is internally provided with the first cavity, and the top of the first cavity is equipped with the first opening, the first cavity Bottom be equipped with second opening, and be provided in the first cavity for seal second be open ball sealer；Baffle plate setting is in outer cylinder In vivo for blocking the first opening, and baffle plate setting has multiple through-holes being connected to the first cavity, and the aperture of through-hole, which is less than, to be blocked The diameter of ball.When needing to transfer detachable bridge plug, in the first cavity by the default setting of ball sealer, and will be blocked by baffle Ball is limited in ball seat, for solving detachable bridge plug in horizontal well and heavy oil wells in use, ball sealer can not launch ball Problem in seat makes detachable bridge plug complete the closure work of pit shaft.

Further, the outer barrel includes first diameter section and second diameter section, and the outer diameter of the first diameter section is small In the outer diameter of second diameter section, the outer surface of the first diameter section and the outer surface transition position of second diameter section form First Terrace.

Further, the bridge plug main body is sleeved on the lower end of the inner cylinder, and the bridge plug main body is towards the ball seat End face abutted with the end face of second diameter section.

Further, the internal diameter of the first diameter section be less than second diameter section internal diameter, the first diameter section it is interior The inner surface transition position of surface and second diameter section forms second step face；The inner cylinder is located in the second diameter section, The upper end of the inner cylinder is abutted with the second step face.

Further, the internal diameter of the inner cylinder is less than the internal diameter of the first diameter section, and the baffle is mounted on described On the upper surface of inner cylinder.

Further, the edge of the baffle is equipped with bolt hole, and the upper surface of the inner cylinder is equipped with and the bolt hole Corresponding threaded hole, between the baffle and the upper surface of the inner cylinder by pass through the bolt hole bolt connection and The bolt is threadedly coupled with the threaded hole.

Further, the cross sectional shape of the inner cylinder, outer barrel and baffle is circle, the outer circumference surface of the baffle It is provided with external screw thread, is equipped with the internal screw thread cooperated with the external screw thread in the outer barrel.

Further, the ball seat includes the straight tube for being inserted into the inner cylinder and being interference fitted with the inner cylinder, The upper end of the straight tube is provided with first opening, and the lower end of the straight tube is provided with a bottom, and the cylinder bottom is provided with described Second opening.

Further, the cylinder bottom is hemispherical dome structure, and the central area of hemispherical dome structure is arranged in second opening.

Further, the straight tube and the cylinder bottom are structure as a whole.

In addition to the utility model described above solve the technical issues of, constitute technical solution technical characteristic and by Outside beneficial effect brought by the technical characteristic of these technical solutions, what detachable bridge plug provided by the utility model can solve The other technical characteristics and these technical characteristic bring beneficial effects for including in other technologies problem, technical solution, will be Further details of explanation is made in specific embodiment.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be practical to this New embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below Attached drawing be only that a part of the embodiment of the utility model is not paying creation for those of ordinary skill in the art Property labour under the premise of, can also be obtained according to these attached drawings other attached drawings.

Fig. 1 is the structural schematic diagram of detachable bridge plug provided by the embodiment of the utility model；

Fig. 2 is the connection schematic diagram of baffle and ball seat in Fig. 1；

Fig. 3 is the structural schematic diagram of baffle in Fig. 2；

Fig. 4 is the structural schematic diagram of ball seat in Fig. 2；

Fig. 5 is outer barrel and inner cylinder connection schematic diagram in Fig. 1；

Fig. 6 is the structural schematic diagram of outer barrel in Fig. 5.

Description of symbols:

10- outer barrel, 20- inner cylinder,

21- first diameter section, 22- second diameter section,

23- First terrace, 24- second step face,

30- baffle, 31- through-hole,

40- ball sealer, 50- ball seat,

The first cavity of 51-, 52- first are open,

53- second is open, 54- straight tube,

55- bottoms.

Specific embodiment

In order to keep the above objects, features, and advantages of the utility model more obvious and easy to understand, below in conjunction with this reality With the attached drawing in new embodiment, the technical scheme in the utility model embodiment is clearly and completely described.Obviously, Described embodiment is only a part of the embodiment of the utility model, instead of all the embodiments.It is practical new based on this Embodiment in type, those of ordinary skill in the art's all other reality obtained without creative labor Example is applied, the range of the utility model protection is belonged to.

In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " suitable The orientation or positional relationship of the instructions such as hour hands ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is orientation based on the figure Or positional relationship, be merely for convenience of describing the present invention and simplifying the description, rather than the device of indication or suggestion meaning or Element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limit to the utility model System.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include at least one this feature.The meaning of " plurality " is at least two, such as two in the description of the present invention, It is a, three etc., unless otherwise specifically defined.

In the present invention unless specifically defined or limited otherwise, fisrt feature is in the second feature " on " or " down " It can be that the first and second features directly contact or the first and second features are by intermediary mediate contact.Moreover, first is special Sign can be fisrt feature above the second feature " above ", " above " and " above " and be directly above or diagonally above the second feature, or only Indicate that first feature horizontal height is higher than second feature.Fisrt feature under the second feature " below ", " below " and " below " can be with It is that fisrt feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.

As shown in Figures 1 to 4, the utility model embodiment provides a kind of detachable bridge plug comprising inner cylinder 20, ball Seat 50, outer barrel 10, ball sealer 40, baffle 30 and bridge plug main body；The upper end of inner cylinder 20 is inserted into outer barrel 10, inner cylinder 20 lower end is detachably connected with bridge plug main body；Ball seat 50 is mounted in inner cylinder 20 from the upper end of inner cylinder 20, in ball seat 50 Portion is provided with the first cavity 51, and the top of the first cavity 51 is equipped with the first opening 52, and the bottom of the first cavity 51 is equipped with second and opens Mouth 53, and the ball sealer 40 for sealing the second opening 53 is provided in the first cavity 51；Baffle 30 is arranged in outer barrel 10 For blocking the first opening 52, and baffle 30 is provided with multiple through-holes 31 being connected to the first cavity 51, and the aperture of through-hole 31 is small In the diameter of ball sealer 40.

Specifically, inner cylinder 20 and outer barrel 10 can choose as hollow cylindrical body, inner cylinder 20 and outer barrel 10 are equal It can choose to be made with certain thickness steel pipe；Wherein, the inner wall of the upper end of inner cylinder 20 is provided with internal screw thread, the upper end Outer wall be provided with external screw thread, the inner wall of outer barrel 10 is provided with the internal screw thread to match with the external screw thread of inner cylinder 20, inner cylinder Body 20 is linked together with outer barrel 10 by internal screw thread and external screw thread.It is understood that inner cylinder 20 in the present embodiment The outer diameter of upper end and the internal diameter of the lower end of outer barrel 10 be equipped with, the two can be by the way of interference fit by inner cylinder 20 upper end is plugged in outer barrel 10.

Ball seat 50 is mounted on the upper end of inner cylinder 20, and ball seat 50 can be the straight tube of a sealed bottom, sets inside ball seat 50 It is equipped with the first cavity 51, the section axial along it is in U-shape, and the upper end of the first cavity 51 is provided with the first opening 52, the first cavity 51 bottom is provided with the second opening 53, and the second opening 53 is connected to the cavity of inner cylinder 20, is provided with envelope in the first cavity 51 Stifled ball 40, the diameter of ball sealer 40 are greater than the latus rectum of the second opening 53, can be effectively sealed the second opening 53.

Exemplary, ball sealer 40 is made of metal material or non-metallic material, and ball sealer 40 can be set into solid Ball, it can be provided spherical shell is preferably made ball sealer of metal material, especially with corrosion resistant metal material Production, makes it have corrosion resistance, and under complicated oil liquid environment, structure will not be destroyed, and the structure for promoting ball sealer is strong Degree.In addition, ball sealer 40 is chosen to medicine ball, the structural strength of ball sealer 40 can be enhanced, in the case where pit shaft suppresses state, envelope Stifled ball 40 will not generate deformation or breakage, can be effectively sealed to the second opening.

It is provided with baffle 30 at the first opening 52 of ball seat 50, baffle 30 is located in outer barrel 10, and 30 distance of baffle The end face distance of first opening 52 of ball seat 50 is less than the diameter of ball sealer 40, prevents ball sealer 40 from transferring in detachable bridge plug When pit shaft, ball sealer 40 is skidded off out of first cavity 51.Baffle 30 is provided with multiple through-holes 31 being connected to the first cavity 51, And the aperture of through-hole 31 is less than the diameter of ball sealer 40, prevents ball sealer 40 from skidding off from through-hole 31.

Specifically, must be provided with through-hole 31 on baffle 30, to guarantee that liquids and gases can pass through；Because in retrievable bridge During filling in tripping in oil/gas well, liquid is had from bridge plug main body and enters inner cylinder 20, needs to flow out from ball seat 50, so Baffle 30 needs guaranteeing also liquid be allowed to flow through while blocking ball sealer 40, it is therefore desirable to through-hole be arranged on baffle 30 31, and the bore size of through-hole 31 can not be excessive or too small, needs to guarantee that ball sealer 40 cannot pass through through-hole 31, while also wanting Guarantee that liquid can quickly pass through the through-hole 31.It is understood that in order to reduce the resistance to liquid, on baffle 30 Cloth is provided with multiple through-holes 31, and in the present embodiment, the hole shape of through-hole 31 can be triangle, circle, rectangular or rectangle Deng preferably through-hole 31 being arranged to round logical as long as guaranteeing that the opening size of through-hole 31 is less than the diameter of ball sealer 40 Hole.

In addition, needing to apply pressure fluid to ball seat 50 when using detachable bridge plug seal shaft, so baffle 30 needs There is certain compression strength, therefore it is preferable to use metal material manufactures for baffle 30, and there is certain thickness.The present embodiment In, there is the preferred metallic copper of baffle 30 production, metallic copper good corrosion resistance to keep away under the oil liquid environment of underground complexity Structural strength is destroyed from corroding to oil liquid, reduces the anti-pressure ability of baffle 30.

The upper end of outer barrel 10 with tubing string (not shown) for connecting, bridge plug main body (not shown) and inner cylinder 20 lower end is detachably connected, and ball sealer 40 is arranged at the second opening 53 of ball seat 50, and ball seat 50 is made to become a unidirectional pressure Power valve, i.e. liquid or gas can enter in the upper end of outer barrel 10 from entering after ball seat 50 in the main channel of bridge plug main body, When applying pressure fluid into the upper end of outer barrel 10, pressure fluid can press second opening of the ball sealer 40 by ball seat 50 53 block, and then realize that ball sealer 40 realizes the sealing to the second opening 53, realize the pressure transmitting downward along inner cylinder 20, Finally realize that bridge plug main body falls off from inner cylinder 20 using this conducting pressure, to realize the sealing to pit shaft.

Detachable bridge plug provided by the embodiment of the utility model is additionally arranged baffle 30 at the first opening 52 of ball seat 50, Ball sealer 40 can be limited in the first cavity 51 of ball seat 50 by the baffle 30, and ball sealer 40 can follow detachable bridge plug one It rises in tripping in pit shaft, even if detachable bridge plug is in horizontal well or heavy oil wells, ball sealer 40 is also maintained at the of ball seat 50 In one cavity 51, and then it can guarantee that detachable bridge plug can smoothly complete the work of setting pit shaft.

As shown in Figures 5 and 6, outer barrel 10 includes first diameter section 21 and second diameter section 22, first diameter section 21 Outer diameter is less than the outer diameter of second diameter section 22, the outer surface of first diameter section 21 and the outer surface transition position shape of second diameter section 22 At First terrace 23.Specifically, outer barrel 10 includes first diameter section 21 and second diameter section 22, and 21 He of first diameter section Second diameter section 22 is integrally formed；The outer diameter of first diameter section 21 is less than the outer diameter of second diameter section 22, therefore first diameter section The transition position of 21 outer surfaces and the outer surface of second diameter section 22 forms First terrace 23；Outer barrel 10 passes through first diameter section In 21 insertion tubing strings and fixed, First terrace 23 is connected on the end face of tubing string, can make to make between outer barrel 10 and tubing string Firmly there is good transmission effect.It is understood that external screw thread has can be set in the first diameter section 21 of outer barrel 10, The internal screw thread matched with external screw thread is provided at the position that tubing string is connect with first diameter section 21, therefore outer barrel 10 is outside Screw thread and internal screw thread are connected in tubing string.In addition, the first diameter section 21 of outer barrel 10 and tubing string can also select others solid Mode is determined, for example, first diameter section 21 is inserted into tubing string by first diameter section 21 and tubing string using interference fit mounting means And it is fixed.

On the basis of the above embodiments, bridge plug main body is sleeved on the lower end of inner cylinder 20, and bridge plug main body is towards ball seat 50 End face abutted with the end face of second diameter section 22.Specifically, the insertion of bridge plug main body is mounted on the lower end of inner cylinder 20, bridge plug master Body and inner cylinder 20 are fixed by shear pin, and the end face of the insertion end of bridge plug main body and the end face of second diameter section 22 are supported It connects, therefore after cutting shear pin from the active force that second diameter section 22 is transferred to bridge plug main body, bridge plug main body is from outer barrel It falls off on 10, during bridge plug main body falls off, the locking device of itself setting is started to work, and is sealed against being connected to pit shaft It is interior, realize the sealing to pit shaft.

On the basis of the above embodiments, the internal diameter of first diameter section 21 is less than the internal diameter of second diameter section 22, and first is straight The inner surface of diameter section 21 and the inner surface transition position of second diameter section 22 form second step face 24；It is straight that inner cylinder 20 is located at second In diameter section 22, the upper end of inner cylinder 20 is abutted with second step face 24.Specifically, outer barrel 10 includes first diameter section 21 and the Two diameter segments 22, and first diameter section 21 and second diameter section 22 are integrally formed, the internal diameter of first diameter section 21 is straight less than second The internal diameter of diameter section 22, therefore the transition position of the inner surface of first diameter section 21 and the inner surface of second diameter section 22 forms second Terrace 24 provides positioning when being mounted on outer barrel 10 for the insertion of inner cylinder 20.

On the basis of the above embodiments, the internal diameter of inner cylinder 20 is less than the internal diameter of first diameter section 21, and baffle 30 is installed On the upper surface of inner cylinder 20.Specifically, the internal diameter of inner cylinder 20 is less than the internal diameter of first diameter section 21, formed for baffle 30 The loading end of installation, baffle 30 are detachably connected on above-mentioned loading end, can also be fixed by the way of welding or bonding On loading end, it is to be understood that when baffle 30 is mounted on loading end, the physical dimension of baffle 30 is less than outer inner cylinder 10 internal diameter guarantees that baffle 30 can slide in outer barrel 10, can smoothly be placed on loading end.

On the basis of the above embodiments, the edge of baffle 30 is equipped with bolt hole, and the upper surface of inner cylinder 20 is equipped with and spiral shell Keyhole corresponding threaded hole passes through the bolt connection across bolt hole and bolt between baffle 30 and the upper surface of inner cylinder 20 It is threadedly coupled with threaded hole.Specifically, baffle 30 can select circular slab to make, its edge is provided with multiple bolts hole, Multiple threaded holes corresponding with bolt hole are provided on the upper surface of inner cylinder 20, baffle 30 is provided with bolt in bolt hole, And in the threaded hole of the upper surface of the thread segment insertion inner cylinder 20 of bolt, and it is together by a threaded connection, baffle is fastened On the upper surface of inner cylinder 20.Due to being connected between baffle 30 and the upper surface of inner cylinder 20 by passing through the bolt of bolt hole It connects, and bolt is threadedly coupled with threaded hole, when baffle 30 damages, convenient for the replacement of baffle 30.

It is understood that baffle 30 can also be directly installed on the first 52 ends of opening of ball seat 50, will can block in advance Ball 40 is put into ball seat 50, then baffle 30 is sealed on to the open end of ball seat 50, such baffle by way of being threadedly engaged 30 just become an entirety with ball seat 50, and ball sealer 40 will not be skidded off from ball seat 50 when placing detachable bridge plug, in turn Meet detachable bridge plug to use in horizontal well or heavy oil wells.

Exemplary, ball seat 50 selects a straight tube, and the upper end is provided with the first opening 52, and bottle cap can be set into baffle 30 The side convex of shape, baffle 30 stretches out an annular sidewall, and the internal diameter of annular sidewall is identical as 50 outer diameter of ball seat, and annular sidewall is set It is equipped with internal screw thread, the side wall positioned at the upper end of ball seat 50 is provided with external screw thread, and baffle 30 is caught in the upper end of ball seat 50, and by outer Screw thread and internal screw thread screw.It can also be provided with internal screw thread in the upper end inner wall of straight tube, be arranged to a circular slab in baffle 30, External screw thread is provided on its outer circumference surface, baffle 30 is mounted in straight tube by external screw thread and internal screw thread, for convenience of baffle 30 Screw-in installation, baffle 30 can its end face be provided with for tool clamping clamping part, this aid portion, which can choose, to be arranged to revolve Button, knob can also be with 30 integral productions of baffle.

In the present embodiment, the cross sectional shape of inner cylinder 20, outer barrel 10 and baffle 30 is circle, the excircle of baffle 30 Face is provided with external screw thread, is equipped with the internal screw thread cooperated with external screw thread in outer barrel 10.Specifically, baffle 30 is arranged in outer barrel 10 It is interior, and be arranged close to the first opening 52 of ball seat 50, the section of outer barrel 10 and baffle 30 is circle, the outer circle of baffle 30 It is provided with external screw thread on circumferential surface, the internal screw thread that 30 external screw thread of baffle matches is provided on the inner wall of the upper end of outer barrel 10, keeps off Plate 30 is mounted in outer barrel 10 by internal screw thread and external screw thread, and regulating fender 30 makes in the fitting depth of 20 upper end of inner cylinder The distance of the end face of first opening 52 of the baffle 30 apart from ball seat 50 is less than the diameter of ball sealer 40, prevents ball sealer 40 from ball seat It is skidded off in 50.

Referring to Fig. 4, ball seat 50 includes the straight tube 54 for being inserted into inner cylinder 20 and being interference fitted with inner cylinder 20, straight tube 54 upper end is provided with the first opening 52, and the lower end of straight tube 54 is provided with a bottom 55, and cylinder bottom 55 is provided with the second opening 53.Specifically , ball seat 50 includes straight tube 54 and cylinder bottom 55, and straight tube 54 can be made of the steel pipe with certain wall thickness, and cylinder bottom 55 can be with For an arc panel, and it is wrapped in the lower end of straight tube 54, and straight tube 54 and cylinder bottom 55 surround the first cavity 51.The lower end of straight tube 54 Insertion in the upper end of inner cylinder 20 and with the interference fit of inner cylinder 20, the upper end of straight tube 54 is provided with the first opening 52, first Opening 52 is connected to the cavity of outer barrel 10.It is threadedly coupled it is understood that straight tube 54 can be used with inner cylinder 20, In, the outer surface of straight tube 54 is provided with external screw thread, and inner cylinder 20 is provided with the internal screw thread matched with the external screw thread of straight tube 54.

On the basis of the above embodiments, cylinder bottom 55, which can choose, is open 53 settings in hemisphere for hemispherical dome structure, second The central area of shape structure.Specifically, cylinder bottom 55 selects a hemispherical shell structure, in the central area of hemispherical shell structure It is provided with the second opening 53, i.e., the second opening 53 is located at the lowest part of hemispherical shell structure, guarantees that ball sealer 40 is beaten in pit shaft Under pressure condition, the second opening 53 can be sealed.It is understood that hemispherical shell structure can weld in straight tube 54 On the end face of lower end, it can also be threadedly attached on the end face of 54 lower end of straight tube.

In the present embodiment, straight tube 54 and cylinder bottom 55 are structure as a whole, and straight tube 54 and cylinder bottom 55 use integrally formed mode Production, can enhance the structural strength of ball seat 50, prevent ball seat 50 in the case where pit shaft suppresses state, and cylinder bottom 55 falls off from straight tube 54, Pit shaft can not be realized setting.

Illustratively, straight tube 54 can be fabricated to a straight tube, and cylinder bottom 55 can be fabricated to hemispherical dome structure, and 54 He of straight tube Cylinder bottom 55 can be integrally formed by the way of casting, be formed in the interior thereof the first cavity 51 to ball seat 50 after molding.Ball seat 50 are provided with the second opening 53 at the top center at its bottom 55, and the second opening 53 is connected in the inner chamber body of inner cylinder 20；Directly One end of cylinder 54 is connect with cylinder bottom 55, and the other end of straight tube 54 is provided with the first opening 52, the first opening 52 and outer barrel 10 The cavity of upper end is connected to, and is provided with baffle 30 at the first opening 52, prevents the ball sealer 40 being arranged in the first cavity 51 It is skidded off out of ball seat.

Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new The range of each embodiment technical solution of type.

Claims (10)

1. a kind of detachable bridge plug, which is characterized in that including inner cylinder, ball seat, outer barrel, ball sealer, baffle and bridge plug main body；

The upper end of the inner cylinder is inserted into the outer barrel, and the lower end of the inner cylinder detachably connects with the bridge plug main body It connects；

The ball seat is mounted in the inner cylinder from the upper end of the inner cylinder, and the ball seat is internally provided with the first cavity, The top of first cavity is equipped with the first opening, and the bottom of first cavity is equipped with the second opening, and first cavity Inside it is provided with the ball sealer for sealing second opening；

The baffle plate setting in outer barrel for blocking first opening, and the baffle plate setting have it is multiple with described first The through-hole of cavity connection, the aperture of the through-hole are less than the diameter of the ball sealer.

2. detachable bridge plug according to claim 1, which is characterized in that the outer barrel includes first diameter section and second Diameter segment, the outer diameter of the first diameter section are less than the outer diameter of second diameter section, the outer surface and second of the first diameter section The outer surface transition position of diameter segment forms First terrace.

3. detachable bridge plug according to claim 2, which is characterized in that the bridge plug main body is sleeved on the inner cylinder The end face of lower end, the bridge plug main body towards the ball seat is abutted with the end face of second diameter section.

4. detachable bridge plug according to claim 3, which is characterized in that the internal diameter of the first diameter section is straight less than second The internal diameter of diameter section, the inner surface of the first diameter section and the inner surface transition position of second diameter section form second step face；

The inner cylinder is located in the second diameter section, and the upper end of the inner cylinder is abutted with the second step face.

5. detachable bridge plug according to claim 3, which is characterized in that it is straight that the internal diameter of the inner cylinder is less than described first The internal diameter of diameter section, the baffle are mounted on the upper surface of the inner cylinder.

6. detachable bridge plug according to claim 1, which is characterized in that the edge of the baffle is equipped with bolt hole, described The upper surface of inner cylinder is equipped with threaded hole corresponding with the bolt hole, leads between the baffle and the upper surface of the inner cylinder Bolt connection and the bolt across the bolt hole is crossed to be threadedly coupled with the threaded hole.

7. detachable bridge plug according to claim 1, which is characterized in that the section of the inner cylinder, outer barrel and baffle Shape is circle, and the outer circumference surface of the baffle is provided with external screw thread, is equipped in the outer barrel and cooperates with the external screw thread Internal screw thread.

8. detachable bridge plug according to claim 1, which is characterized in that the ball seat includes being inserted into the inner cylinder And the straight tube with inner cylinder interference fit, the upper end of the straight tube are provided with first opening, the lower end of the straight tube It is provided with a bottom, the cylinder bottom is provided with second opening.

9. detachable bridge plug according to claim 8, which is characterized in that the cylinder bottom be hemispherical dome structure, described second The central area of hemispherical dome structure is arranged in opening.

10. detachable bridge plug according to claim 8, which is characterized in that the straight tube and the cylinder bottom are structure as a whole.