CN210033354U

CN210033354U - Slip tooth synchronizing mechanism of casing head

Info

Publication number: CN210033354U
Application number: CN201920940997.7U
Authority: CN
Inventors: 续伟; 宿官礼; 王富涛; 孙荣华; 郑志刚
Original assignee: Shengli Oilfield Haorui Petroleum Machinery Co Ltd
Current assignee: Shengli Oilfield Haorui Petroleum Machinery Co Ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-02-07
Anticipated expiration: 2029-06-21

Abstract

The utility model discloses a casing head slips tooth synchronizing mechanism, including casing head, slips casing and supporting seat, be equipped with the toper platform on the casing head inner wall, the supporting seat is located on the toper platform, be equipped with the ring type seal circle between supporting seat and the slips casing, the inner chamber of slips casing is equipped with a plurality of slips teeth, slips casing and slips tooth are connected through the back taper face cooperation, the internal surface radian of slips tooth and tubular column surface radian looks adaptation; the outer circle surface of two adjacent slips tooth looks remote ends is equipped with synchronous mounting groove respectively, and synchronous mounting groove is located slips tooth's the inverted cone face, is equipped with round pin chock in two synchronous mounting grooves, and the radian of round pin chock is the same with slips tooth radian and with the coaxial setting of slips tooth, the surface of round pin chock and the contact of the back taper fitting surface of slips casing. The utility model discloses enable the synchronous even atress of slips, do not produce the dislocation when guaranteeing the atress between the slips, be in on the coplanar all the time, guaranteed sufficient chucking power.

Description

Slip tooth synchronizing mechanism of casing head

Technical Field

The utility model relates to an oil drilling wellhead assembly, concretely relates to casing head slips tooth lazytongs.

Background

Slip hangers are frequently used for hanging and connecting casing pipes in current oil drilling, and slip teeth in the slip hangers are basically designed to be annular split structures. However, in actual use, the casing string at the wellhead location may not be perfectly coaxial with the casing head bore due to different well bore designs (especially horizontal or deviated wells with smaller kick-offs) or cementing of the wells. Therefore, after the slip hanger is installed, the acting force of the sleeve on the slip teeth is not uniform, the slip teeth are easy to generate dislocation, the suspension force is influenced, and even the problem that a sleeve pipe column falls off is caused.

Disclosure of Invention

The utility model aims at providing a defect to prior art exists, provide a rational in infrastructure, the synchronous even atress of slips tooth does not produce the dislocation when guaranteeing the atress between the slips tooth, is in on the coplanar all the time, has guaranteed sufficient clamping force to guarantee the casing head slips tooth lazytongs of well head safety.

The technical scheme is as follows: a casing head slip synchronizing mechanism comprises a casing head and a slip shell installed in an inner cavity of the casing head, wherein a supporting seat is arranged below the slip shell, a conical table is arranged on the inner wall of the casing head, the supporting seat is located on the conical table, an annular sealing ring is arranged between the supporting seat and the slip shell, a plurality of arc-shaped split slip teeth are arranged in the inner cavity of the slip shell, the slip shell and the slip teeth are connected in a matched mode through inverted conical surfaces, and the radian of the inner surface of the slip teeth is matched with that of the outer surface of a pipe column;

the outer circle surfaces of two adjacent slips tooth looks remote ends are equipped with the synchronous mounting groove that extends to slips tooth axis direction respectively, synchronous mounting groove is located slips tooth's the inverted cone face, is equipped with the round pin piece that is used for connecting two adjacent slips tooth in two synchronous mounting grooves, the radian of round pin piece is the same with slips tooth radian and with the coaxial setting of slips tooth, the surface of round pin piece contacts with the back taper fitting surface of slips casing.

Preferably, the synchronous mounting groove is perpendicular to the slip insert axis.

Preferably, the outer surface of the cotter block located in the synchronizing installation groove is flush with the outer circumferential surface of the slip insert.

Preferably, the slip teeth comprise a lower reverse cone and an upper reverse cone which are arranged on the two outer surfaces of the slip teeth and are parallel to each other, and the lower reverse cone and the upper reverse cone are connected together in a smooth transition mode.

Preferably, the length of the lower inverse taper is greater than the length of the upper inverse taper.

Preferably, the pin stopping block is detachably connected with the slip teeth through the synchronous mounting groove, and the outer surface of the pin stopping block is of an arc-shaped conical surface structure corresponding to the outer circumferential surface of the slip teeth.

Compared with the prior art, the utility model, have following advantage: simple structure, the design has the slips of round pin piece of hindering, can link together adjacent slips to make the sleeve pipe under to the inhomogeneous condition of slips effort, can avoid the problem of the asynchronous atress of a plurality of slips, guaranteed the sufficient chucking power of slips, and the homogeneity of atress, the even chucking sleeve pipe of ability.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a partial schematic view of the hanger;

in the figure: 1. a casing head; 2. slip teeth; 3. a slip housing; 4. a supporting seat; 5. an annular seal ring; 6. a conical table; 7. a pipe string; 8. a synchronous mounting groove; 9. a pin stop block; 21. a lower inverted cone; 22. an upper reverse taper body.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Referring to fig. 1-3, a casing head slip synchronous mechanism comprises a casing head 1, split slip teeth 2, a slip shell 3, a support seat 4 and an annular seal ring 5. Be equipped with the tapered table 6 on the 1 inner wall of casing head, supporting seat 4 installs on tapered table 6, and 3 bottoms of slips casing are sat on supporting seat 4, install ring type seal 5 between and seal up, and the inner chamber of slips casing 3 is equipped with a plurality of curved split type slips 2, and slips casing 3 is connected through the cooperation of the down-cone face with slips 2, and slips 2's internal surface radian and 7 outer surface radian looks adaptations of tubular column. Under the action of the dead weight of the pipe column 1, the dead weight is transmitted to the slip shell 3 through the slip teeth 2 and then applied to the annular sealing ring 5 to excite the annular sealing ring 5 to realize sealing.

The outer circle surface of the opposite ends of two adjacent slips 2 is provided with the synchronous mounting groove 8 that extends to slips axis direction respectively, and the both ends of every slips 2 all are equipped with synchronous mounting groove 8. The synchronous mounting groove 8 is perpendicular to the axis of the slip teeth 2, the synchronous mounting groove 8 is located on the inverted conical surface of the slip teeth 2, and therefore the pin blocking blocks 9 arranged in the two synchronous mounting grooves 8 can be used for connecting the two adjacent slip teeth 2, and linkage performance is achieved. When one of the slip teeth 2 is stressed, the other slip teeth 2 are synchronously driven to be stressed synchronously, so that the sufficient clamping force and the stress uniformity of the slip teeth 2 are ensured, and the pipe column 7 can be uniformly clamped.

In addition, the radian of the pin stop block 9 is the same as that of the slip teeth 2 and is coaxially arranged with the slip teeth 2, the pin stop block 9 is detachably connected with the slip teeth 2 through the synchronous mounting groove 8, the outer surface of the pin stop block 9 is of an arc-shaped conical surface structure corresponding to the outer circumferential surface of the slip teeth 2, and the outer surface of the pin stop block 9 is in contact with the inverted cone-shaped matching surface of the slip shell 3 after mounting, namely the outer surface of the pin stop block 9 is flush with the outer circumferential surface of the slip teeth 2. Like this when the slips 2 when the atress back with 3 conical surface cooperations of slips casing, round pin stop block 9 does not influence the normal use of toper fitting surface, and every slips 2 all connects through round pin stop block 9 after the installation moreover and forms a whole, produces clamping force to tubular column 7 in step, does not produce the dislocation when guaranteeing the atress between the slips 2, is in the coplanar all the time.

The slip teeth 2 comprise a lower reverse cone 21 and an upper reverse cone 22 which are arranged on the outer surfaces of the slip teeth and are parallel to each other, and the lower reverse cone 21 and the upper reverse cone 22 are connected together in a smooth transition mode. The length of the lower reverse taper body 21 is longer than that of the upper reverse taper body 22. Make slips 2 and slips casing 3 be connected through two sections back taper face, can play better effect of holding tightly on the one hand, on the other hand can be spacing, makes tubular column 7 stop to move in the axial, can also improve the leakproofness.

When the slip teeth 2 are processed, a synchronous mounting groove 8 for mounting the pinning stop block 9 is processed on the excircle, and the pinning stop block 9 is assembled. And a matched synchronous mounting groove 8 is processed on the outer circle of the adjacent slip teeth 2. During the field installation, install slips hanger (by slips 2, round pin stop block 9, slips casing 3, ring type seal 5 and supporting seat 4 are constituteed jointly) in the hole of casing head 1 earlier, under the effect of tubular column 7 dead weight, on slip 2 was used to the dead weight, when any slip 2 atress, other slip 2 was synchronous with the slip that first atress under round pin stop block 9 effect, laminating tubular column 7 simultaneously, exerted even clamping force to tubular column 7 jointly. Meanwhile, gravity is transmitted to the slip shell 3 through the slip teeth 2 and then applied to the annular sealing ring 5 to excite the annular sealing ring 5 to realize sealing. Therefore, the clamping force of each clamping tile tooth 2 can be ensured to be uniform, so that the annular sealing ring 5 is stressed uniformly, and the sealing of the hanger is ensured to be effective all the time.

The utility model discloses can avoid under the operating condition slips 2 asynchronous problem completely, guarantee sufficient chucking power to and the homogeneity of atress. The working state of the slip teeth of the 18 installed wells is recorded on site, the uniform synchronism of the slip teeth is found to be 100%, and the purpose of uniformly clamping the casing pipe is achieved. The slip teeth 2 are ensured not to be dislocated when stressed and are always positioned on the same plane.

The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the spirit of the present invention, and the changed contents still belong to the protection scope of the present invention.

Claims

1. A casing head slip synchronizing mechanism comprises a casing head and a slip shell arranged in an inner cavity of the casing head, and is characterized in that a supporting seat is arranged below the slip shell, a conical table is arranged on the inner wall of the casing head, the supporting seat is located on the conical table, an annular sealing ring is arranged between the supporting seat and the slip shell, a plurality of arc split-type slip teeth are arranged in the inner cavity of the slip shell, the slip shell and the slip teeth are connected in a matched mode through inverted conical surfaces, and the radian of the inner surface of the slip teeth is matched with that of the outer surface of a pipe column;

2. The casing head slip synchronizing mechanism of claim 1, wherein: the synchronous mounting groove is perpendicular to the slip tooth axis.

3. The casing head slip synchronizing mechanism of claim 2, wherein: the outer surface of the pin stop block positioned in the synchronous mounting groove is flush with the outer circumferential surface of the slip insert.

4. The casing head slip synchronizing mechanism of claim 1, wherein: the slip teeth comprise a lower inverted cone and an upper inverted cone which are arranged on the outer surfaces of the slip teeth in parallel, and the lower inverted cone and the upper inverted cone are connected together in a smooth transition mode.

5. The casing head slip synchronizing mechanism of claim 4, wherein: the length of the lower inverted cone is larger than that of the upper inverted cone.

6. The casing head slip synchronizing mechanism of claim 3, wherein: the pin stop block is detachably connected with the slip teeth through the synchronous mounting groove, and the outer surface of the pin stop block is of an arc-shaped conical surface structure corresponding to the outer circumferential surface of the slip teeth.