CN214944073U

CN214944073U - Non-rotating casing centralizer

Info

Publication number: CN214944073U
Application number: CN202120513741.5U
Authority: CN
Inventors: 段凯军
Original assignee: Mudanjiang Hanjie Petroleum Technology Co ltd
Current assignee: Mudanjiang Hanjie Petroleum Technology Co ltd
Priority date: 2021-03-11
Filing date: 2021-03-11
Publication date: 2021-11-30
Anticipated expiration: 2031-03-11

Abstract

A non-rotating casing centralizer comprises an upper joint, a centralizing main body, a supporting sleeve, a rotating sleeve, a centralizing plate, plate reeds and sliding bearings, wherein the rotating sleeve is embedded on the centralizing main body and the supporting sleeve, the sliding bearings are respectively embedded at the end parts of two ends of the rotating sleeve, the centralizing plate is embedded on the outer side surface of the rotating sleeve, the plate reeds are arranged between the centralizing plate and the centralizing main body, the centralizer is suitable for oil well surface casing and technical casing sections, the structural design that the rotating sleeve can freely rotate relative to the centralizing main body is adopted, the centralizing plate and the centralizing sleeve are relatively static in work, the friction damage of the casing and the centralizer is avoided, the production quality of an oil well can be ensured, the well cementation operation efficiency is improved, the production cost of the oil well is reduced, meanwhile, a plate spring sheet is adopted to support the centralizing plate structure, the centralizer has the characteristics of good stability and high reliability, and is applied to the production of offshore oil fields, the method can solve the technical bottleneck existing in offshore oilfield well cementation operation, perfect the well cementation technical process and improve the technical level of well completion.

Description

Non-rotating casing centralizer

Technical Field

The utility model relates to a sleeve pipe centralizer, in particular to non-rotating sleeve pipe centralizer.

Background

The well cementation of the oil well is a technological process of putting a casing in a drilled open hole, then injecting cement slurry into an annular space between the casing and the well hole, and consolidating the casing and a bottom layer into a whole, wherein in the technological process, the cement slurry is injected from the bottom of the oil well at high pressure through a pipe column sent into a sleeve, in order to ensure the production quality of the oil well, a sleeve centralizer is installed on the pipe column according to the requirements of well cementation technical specifications so as to keep the well body structure of the oil well centered and aligned, the casing centralizer applied in actual production usually comprises two types of rigid centralizer and flexible centralizer, the centralizers are fixedly installed and connected with the pipe column in use, and because the pipe column needs to keep a certain speed of technological rotation in the well cementation process, the rotating centralizer centralizing surface and the sleeve generate mutual friction, and the mutual friction can not only form friction resistance to influence the working efficiency of the pipe column, the friction damage of the casing or the centralizer is easily caused, the production quality of an oil well is influenced, too high production consumption is caused, meanwhile, the damaged centralizer is frequently replaced, the adverse effect on the well cementation operation efficiency is directly caused, particularly in an offshore oil field, the adverse effect on the well cementation operation is particularly obvious due to the mutual friction between the centralizer and the sleeve because the stability of a drilling and production platform is relatively low and a pipe column needs to keep a high rotating speed to dynamically control and adjust the well body structure of the oil well, and the technical bottleneck of the well cementation operation of the offshore oil field is formed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a non-rotating casing centralizer is applied to oil well top layer sleeve pipe and technical casing section, improves well cementation operating efficiency, reduces oil well manufacturing cost.

A non-rotating casing centralizer, comprising: the upper joint is provided with an internal thread which is matched with a pipe column, the lower end of the upper joint is provided with an external thread, the upper end of the righting main body is provided with an internal thread which is matched with the external thread at the lower end of the upper joint and is fixedly connected with the upper joint in a matched manner, the lower end of the righting main body is provided with an external thread which is matched with the pipe column, the body is provided with a circumference reducing and forms a reducing shoulder, the supporting sleeve is of a cylindrical structure, the inner diameter of the cylinder is matched with the structure formed at the upper part of the righting main body and is sleeved at the upper end of the righting main body, the outer circumferential surface of the cylinder is provided with a reducing shoulder, the rotating sleeve is also of a cylindrical structure, the rotating sleeve is embedded between the upper part of the righting main body and the lower part of the supporting sleeve, the reducing shoulder on the supporting sleeve and the reducing shoulder on the righting main body, and the inner side surface of the righting main body is correspondingly matched with the outer side surface structure of the righting main body, the upper end face and support between the reducing circular bead on the cover, lower terminal surface with right between the reducing circular bead on the main part respectively inlay and be put the slide bearing, along circumference evenly distributed on the lateral surface seted up 2 ~ 6 axial inlay grooves, still seted up the guiding gutter that the axial is link up simultaneously, right the board section and be bow-shaped protruding shape, the bellying is circular cylinder, corresponds spacing respectively and inlays and put in inlay the groove, the leaf spring piece corresponds respectively to be set up right between board and the right main part, elastic support right the board protrusion in the periphery of rotating sleeve.

Further, preferably, an interference fit structure is arranged between the support sleeve and the righting main body.

Furthermore, preferably, the rotating sleeve and the centering body and the supporting sleeve are in clearance fit with each other.

The beneficial effects of the utility model are that, a non-rotating casing centralizer suitable for oil well top casing and technical casing section is provided, adopt the swivel sleeve can right the structural design of main part free rotation relatively, it is static relatively with righting the sleeve to right the board in the work, the friction of sleeve pipe and centralizer has been avoided and has been damaged, can guarantee oil well production quality, improve well cementation operating efficiency, reduce oil well production cost, and simultaneously, adopt the leaf spring piece to support the righting plate structure, still it is good to right the stability of sleeve righting, the characteristics that the reliability type is high, be applied to in the production of offshore oil field, can solve the technique "bottleneck" that exists in the oil field well cementation operation, perfect well cementation technical process, improve well completion technical level.

Drawings

FIG. 1 is a diagram of a non-rotating casing centralizer centralizing plate in a convex configuration.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a view showing a structure of a non-rotating casing centralizer in an internally retracted state.

Fig. 4 is a sectional view taken along line B-B in fig. 3.

Detailed Description

The technical solution claimed by the present invention is described in detail below with reference to the following embodiments and accompanying drawings.

A non-rotating casing centralizer is composed of an upper joint 1, a centralizing main body 2, a supporting sleeve 8, a rotating sleeve 3, a centralizing plate 4, a plate reed 5, a sliding bearing 7 and a limiting clamping block 6, wherein the upper end of the upper joint 1 is provided with internal threads, the lower end of the upper joint is provided with external threads, the upper end of the centralizing main body 2 is matched and fixedly connected with the upper joint 1, the lower end of the centralizing main body is provided with external threads, the body is provided with a circumference reducing and forms a reducing shoulder, the supporting sleeve 8 is of a cylindrical structure, the inner diameter of the cylindrical body is structurally matched with the upper part of the centralizing main body 2 and is sleeved at the upper end of the centralizing main body 2 in an interference fit manner, the outer circumferential surface of the cylindrical body is provided with a reducing shoulder, the rotating sleeve 3 is also of a cylindrical structure and is embedded between the upper part of the centralizing main body 2 and the lower part of the supporting sleeve 8, the shoulder on the supporting sleeve 8 and the reducing shoulder on the centralizing main body 2 in a clearance fit manner, the upper end face and the support sleeve 8 are provided with reducing shoulders, the lower end face and the centering body 2 are provided with reducing shoulders, the sliding bearings 7 are respectively embedded between the upper end face and the lower end face, 5 axial embedding grooves 9 are uniformly distributed on the outer side face along the circumference, the limiting clamping blocks 6 are respectively and fixedly installed at the two axial ends of the

embedding grooves

9, 4 axially through diversion trenches 10 are also arranged at intervals of the embedding grooves, the cross section of the centering plate 4 is in an arched convex shape, the convex surfaces are circular cylindrical surfaces and are respectively limited by the limiting clamping blocks 6 and embedded in the embedding grooves 9, the plate spring pieces 5 are respectively and correspondingly arranged between the centering plate 4 and the centering body 2, the centering plate 4 is elastically supported, and the sliding bearings 7 are alloy ring sliding bearings.

The non-rotating casing centralizer is suitable for primary and secondary drilling sections to centralize an oil well surface casing and a technical casing, when in use, the upper end and the lower end of the non-rotating casing centralizer are connected to the positions, corresponding to the well centralizing sections, on a pipe column, the centralizing plate 4 on the non-rotating casing centralizer is in a protruding state before an oil well is put into the oil well, as shown in figures 1 and 2, the centralizing plate 4 is elastically supported by a plate spring 5, so that the two ends of the centralizing plate are tightly abutted against a limiting clamping block 6, the protruding surface of an arch-shaped bulge fully protrudes out of the outer circumferential surface of a rotating sleeve 3, after the pipe column is put into the oil well, as shown in figures 3 and 4, the centralizing plate 4 is restrained by a centralizing sleeve to overcome the elastic tension of the plate spring 5 to be inwardly retracted, the protruding surface is in surface contact with the centralizing sleeve, and the 5 centralizing plates 4 are uniformly distributed to jointly act, the centralizing body 2 is kept at the central position of the centralizing sleeve, and the centralizing sleeve is controlled to be aligned; in the process of well cementation, the rotating sleeve 3 is in clearance fit with the centering body and the supporting sleeve, and sliding bearings 7 are respectively arranged between the rotating sleeve 3 and the supporting sleeve 8 as well as between the rotating sleeve 3 and the centering body 2, so that the rotating sleeve 3 can be ensured to freely rotate relative to the centering body 2, therefore, the rotating sleeve 3 cannot rotate along with a pipe column under the action of friction force of the centering sleeve but forms a relatively static non-rotating centering action with the centering sleeve, and as the friction influence between the rotating sleeve 3 and the centering sleeve is avoided, the friction damage of a casing and a centralizer is avoided, the production quality of an oil well is ensured, and the centralizer can be recycled, thereby reducing the production consumption and improving the working efficiency; meanwhile, the structure that the plate reeds 5 support the righting plate 4 is adopted, so that the contact between the righting plate 4 and the righting sleeve surface can be kept, and the righting posture of the righting plate 4 can be adjusted by the plate reeds 5 when the righting plate 4 meets a blocking obstacle on a shaft, so that the righting stability and reliability of the righting sleeve are fully improved.

Claims

1. A non-rotating casing centralizer, comprising: the upper joint (1), the centering body (2), the supporting sleeve (8), the rotating sleeve (3), the centering plate (4), the plate spring piece (5) and the sliding bearing (7), wherein an internal thread is arranged at the upper end of the upper joint (1), an external thread is arranged at the lower end of the upper joint, an internal thread matched with the external thread at the lower end of the upper joint (1) is arranged at the upper end of the centering body (2), the internal thread is matched and fixedly connected with the upper joint (1), an external thread is arranged at the lower end of the centering body, a circumference reducing shoulder is arranged on the body of the centering body and forms a reducing shoulder, the supporting sleeve (8) is of a cylindrical structure, the inner diameter of the cylindrical body is matched with the upper part of the centering body (2) in a structure and sleeved at the upper end of the centering body (2), the reducing shoulder is arranged on the circumference surface at the outer side of the cylindrical body, and the rotating sleeve (3) is also of a cylindrical structure and is sleeved on the upper part of the centering body (2) and the lower part of the supporting sleeve (8), Support the reducing circular bead on cover (8) with between the reducing circular bead on the body of righting (2), the medial surface with the lateral surface structure of the body of righting (2) forms and corresponds the cooperation, at the up end with support between the reducing circular bead on cover (8), down the terminal surface with it has inlayed respectively to right between the reducing circular bead on the body of righting (2) slide bearing (7), along circumference evenly distributed on the lateral surface 2 ~ 6 axial inlay recess (9) have been seted up, the guiding gutter (10) that the axial link up still have been seted up simultaneously, it is bow-shaped protruding shape to right board (4) section, the bellying face is circular cylinder, corresponds respectively spacing inlay and puts in inlay in recess (9), board reed (5) correspond the setting respectively right board (4) with right between the body of righting (2).

2. The non-rotating casing centralizer of claim 1 wherein: the supporting sleeve (8) and the righting main body (2) are in an interference fit structure.

3. A non-rotating casing centralizer, according to claim 2, wherein: the rotating sleeve (3) and the righting main body (2) and the supporting sleeve (8) are in clearance fit with each other.

4. A non-rotating casing centralizer, according to any of claims 1 to 3, wherein: the sliding bearing (7) is an alloy ring sliding bearing.