CN208966250U - A kind of integral bottom slips casing head - Google Patents

Abstract

The utility model discloses a kind of integral bottom slips casing heads, including casing, casing head ontology, slip insert, retaining screw, holding screw, described sleeve pipe is steel-tube construction, described sleeve pipe head ontology and the slip insert are coaxially nested in the outside of described sleeve pipe, the slip insert is located at the lower inside of described sleeve pipe head ontology, the retaining screw passes through the retaining screw hole of described sleeve pipe head body bottom portion, it is screwed into the threaded hole of the slip insert, the holding screw is screwed into the set screw hole of described sleeve pipe head body bottom portion.Compared with prior art, slip spider and the integral formula of casing head body design in traditional structure are increased structural strength, improve Product Safety by the utility model；Traditional bolt locking is changed to holding screw locking, product human-machine operation is optimized, while reducing the quantity of product locking point, saves the product set-up time, improve product installation effectiveness.

Description

A kind of integral bottom slips casing head

Technical field

The utility model belongs to oil recovery/gas wellhead equipment technical field, is specifically related to a kind of integral bottom slip sleeve Tube head.

Background technique

At present both at home and abroad wellhead assembly connect substantially using welded type with surface pipe connection type, screw-type connection Three kinds are connected with split type bottom slips.Wherein split type bottom slips connection structure is mainly by bolt, nut, slip spider, card Watt tooth, casing head ontology and well head pedestal composition.As shown in Figure 1.The structure is cooperated by screw bolt and nut, by casing, slips Seat, slip insert, casing head ontology link together.

The major defect of the prior art is:

(1) screw bolt and nut is located at below casing head ontology, when operator's tightening nut, needs tool reaching casing head Ontology, which issues, to be operated, and is operated inconvenient.

(2) due to the obstruction of well head pedestal support plate, the operating space of tightening nut is limited, and operator needs to carry out multiple Screwing operations could be by nut tightening in place.

(3) in order to guarantee the secured of such connection structure, the quantity for being equipped with screw bolt and nut is more, and operator needs will be every A nut all screws, time-consuming and laborious.

Utility model content

In order to overcome the deficiencies of the prior art, the utility model provides a kind of integral bottom slips casing head, for operation Person provides reasonable, comfortable operating space, reduces the quantity of connector, reduces the set-up time of casing head, improves installation effect Rate.

The technical solution of the utility model is:

A kind of integral bottom slips casing head, including casing, casing head ontology, slip insert, retaining screw, clamp screw Nail, described sleeve pipe head ontology and the slip insert are coaxially nested in the outside of described sleeve pipe, and described sleeve pipe head body bottom portion is equipped with The external peripheral surface of conical socket, the slip insert is the conical surface, and the slip insert is located at the bottom inside of described sleeve pipe head ontology And the conical surface is matched with the inner wall of the conical socket；The lower part of described sleeve pipe head ontology and the slips tooth side are logical It crosses attachment device to be detachably connected, described sleeve pipe head body bottom portion side, which is equipped with, oppresses the slip insert and slip insert is made to hold institute tightly The holding screw of casing is stated, circular conical surface is equipped at the top of the holding screw, is equipped at the top of the slip insert and matches with the circular conical surface The step of conjunction.

It is further preferred that the attachment device is across the retaining screw hole of described sleeve pipe head body bottom portion side and institute State the retaining screw of threaded hole connection the described sleeve pipe head ontology and the slip insert of slips tooth side.

Further, the retaining screw hole is unthreaded hole.

It is further preferred that the circular conical surface at the top of the holding screw is 45 °.

It is further preferred that the step of the slips tooth side is 45 °.

It is further preferred that described sleeve pipe is steel-tube construction.

Compared with prior art, the utility model by traditional structure slip spider and casing head body design it is integral Formula increases structural strength, improves Product Safety；Traditional bolt locking is changed to holding screw locking, is optimized Product human-machine operation, while reducing the quantity of product locking point, the product set-up time is saved, product installation effect is improved Rate.

Detailed description of the invention

It, below will be to institute in embodiment description for the clearer technical solution for illustrating the utility model embodiment Attached drawing to be used is needed to do simple introduction, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be attached according to these Figure obtains other accompanying drawings.

Fig. 1 is the traditional type floor structure of falling slips schematic diagram；

Fig. 2 is the utility model structure diagram；

Fig. 3 is the schematic diagram after the utility model is installed；

Fig. 4 is the structure sectional view of casing head ontology；

Fig. 5 is the structure sectional view of slip insert；

Fig. 6 is the bottom view of Fig. 5；

Fig. 7 is holding screw schematic diagram；

In figure: 1, casing head ontology, 2, slip insert, 3, holding screw, 4, retaining screw, 5, casing, 6, set screw hole, 7, retaining screw hole, 8, conical socket, 9,45 ° of steps, 10, threaded hole, 11,45 ° of circular conical surfaces.

Specific embodiment

Here is that the present invention will be further described in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 2-7, a kind of integral bottom slips casing head, including casing 5, casing head ontology 1, slip insert 2, maintenance Screw 4, holding screw 6, casing head ontology 1 and slip insert 2 are coaxially nested in the outside of casing 5, and 1 bottom of casing head ontology is equipped with Conical socket 8, casing head ontology 1 carry the weight of slip insert 2 and casing 5 by conical socket 8；The outer circle weekly form of slip insert 2 Face is the conical surface, and slip insert 2 is located at the conical surface of the bottom inside of casing head ontology 1 and slip insert 2 and the taper of casing head ontology 1 The inner wall of groove matches, and slip insert 2 can be achieved in this way along the conical surface inner wall of conical socket and lock locking；1 bottom of casing head ontology Portion is connect with 2 side of slip insert by retaining screw 4, when transferring casing 5 in this way, guarantees that the internal diameter of slip insert 2 is greater than casing 5 Outer diameter prevents from blocking convenient for decentralization casing 5.1 bottom sides of casing head ontology are equipped with compressing slip insert 2 and hold slip insert 2 tightly The holding screw 6 of casing 5 is equipped with circular conical surface at the top of holding screw 6, is equipped with the step cooperated with 5 circular conical surfaces at the top of slip insert 2, The circular conical surface at 6 top of holding screw is 45 °, and the step of 2 side of slip insert is 45 °.In this way when tightening holding screw 6, tightening 45 ° of circular conical surfaces 11 at the top of screw 6 are matched with 45 ° of steps 9 of 2 side of slip insert, make slip insert 2 along cooperate the conical surface to moving down It is dynamic, so that slip insert 2 be made to hold casing 5 tightly.

The retaining screw hole 7 that 1 lower side retaining screw 4 of casing head ontology passes through is unthreaded hole.

When nominally installing wellhead assembly, first by casing head ontology 1, slip insert 2, holding screw 3, retaining screw 4 are assembled into casing head general assembly, and then casing 5 transfers to designated depth, and casing head general assembly is placed on surface pipe, due to solid The effect of position screw 4, slip insert 2 are tightly attached to 1 bottom pyramidal groove inner wall of casing head ontology, and the diameter of bore of slip insert 2 is greater than The outer diameter of casing 5, so casing 5 is directly inserted into 1 bottom of casing head.Retaining screw 4 is screwed out into slip insert 2, from casing head Ontology 1 takes out.Slip insert 2 is glided due to gravity along 1 bottom pyramidal groove inner wall of casing head ontology, until slip insert 2 connects Touch casing 5.Holding screw 3 is screwed at this time, and under the action of 1 set screw hole screw thread of casing head ontology, holding screw 3 is to casing The center of head ontology 1 is mobile, under the cooperation of 45 ° of steps 9 of 45 ° of circular conical surfaces 11 and slip insert 2 of holding screw 3, slip insert 2 Continuation is moved down along 1 bottom pyramidal groove inner wall of casing head ontology, and is drawn close to the center of casing head ontology 1, and slip insert 2 holds set tightly Pipe 5.Due to the effect of 5 self gravity of casing, it will drive slip insert 2 and continue under 1 bottom pyramidal groove inner wall of casing head ontology Move, and drawn close to the center of casing head ontology 1, further ensure casing 5 connect with casing head 1 it is safe and reliable.

The configuration of the present invention is simple reduces the quantity of product locking point convenient for operation, saves the product set-up time, improves Product installation effectiveness；Using integrated design, structural strength is increased, improves Product Safety.

The utility model is not limited to above-mentioned embodiment, within the knowledge of those skilled in the art, The present invention can also be realized without departing from the purpose of the present invention. Make a variety of changes, and the content after variation still falls within the utility model Protection scope.

Claims (6)

1. a kind of integral bottom slips casing head, it is characterised in that: including casing, casing head ontology, slip insert, maintenance spiral shell Nail, holding screw, described sleeve pipe head ontology and the slip insert are coaxially nested in the outside of described sleeve pipe, described sleeve pipe head ontology Bottom is equipped with conical socket, and the external peripheral surface of the slip insert is the conical surface, and the slip insert is located at described sleeve pipe head ontology The bottom inside and conical surface is matched with the inner wall of the conical socket；The lower part of described sleeve pipe head ontology and the slips Tooth side is detachably connected by attachment device, and described sleeve pipe head body bottom portion side, which is equipped with, oppresses the slip insert and make slips Tooth holds the holding screw of described sleeve pipe tightly, and circular conical surface is equipped at the top of the holding screw, be equipped at the top of the slip insert with it is described The step of circular conical surface cooperation.

2. a kind of integral bottom slips casing head according to claim 1, it is characterised in that: the attachment device is to wear The retaining screw hole for crossing described sleeve pipe head body bottom portion side connects described sleeve pipe head sheet with the threaded hole of the slips tooth side The retaining screw of body and the slip insert.

3. a kind of integral bottom slips casing head according to claim 2, it is characterised in that: the retaining screw hole is Unthreaded hole.

4. a kind of integral bottom slips casing head according to claim 1, it is characterised in that: at the top of the holding screw Circular conical surface be 45 °.

5. a kind of integral bottom slips casing head according to claim 1, it is characterised in that: the slips tooth side Step is 45 °.

6. a kind of integral bottom slips casing head according to claim 1, it is characterised in that: described sleeve pipe is steel pipe knot Structure.