CN210948528U

CN210948528U - Centralizer

Info

Publication number: CN210948528U
Application number: CN201920630647.0U
Authority: CN
Inventors: 周战云; 刘高军; 李社坤; 马小龙; 郭子文; 任文亮
Original assignee: Sinopec Oilfield Service Corp; Sinopec Zhongyuan Petroleum Engineering Co Ltd; Well Cementation Co of Sinopec Zhongyuan Petroleum Engineering Co Ltd
Current assignee: Sinopec Oilfield Service Corp; Sinopec Zhongyuan Petroleum Engineering Co Ltd; Well Cementation Co of Sinopec Zhongyuan Petroleum Engineering Co Ltd
Priority date: 2019-05-05
Filing date: 2019-05-05
Publication date: 2020-07-07
Anticipated expiration: 2029-05-05

Abstract

The utility model discloses a centralizer, which comprises an upper hoop, a lower hoop and an elastic righting sheet, wherein the upper hoop and the lower hoop are coaxially arranged, and the elastic righting sheet is a spiral righting sheet; the maximum outer diameter of the elastic righting sheet is larger than the outer diameter of the upper hoop, and the maximum outer diameter of the elastic righting sheet is larger than the outer diameter of the lower hoop; the elastic righting piece is detachably connected with the upper hoop and the lower hoop through screws. During the use, with the external casing operation of going on of centralizer suit at the sleeve pipe, because the biggest external diameter of elasticity righting piece is greater than the external diameter of upper hoop and lower hoop simultaneously, consequently, when the centralizer passes through undergauge or the anomalous well section of well footpath, the contact takes place with the wall of a well first for the elasticity righting piece to driving away the sleeve pipe and leaving the wall of a well, ensure the centering degree of sleeve pipe in the well. The elastic centralizing pieces are spirally distributed in the same direction, so that the centralizer can rotate under the action of the friction force of the well wall in the running-in process, the centralizing posture of the centralizer can be conveniently adjusted, and the centralizer can smoothly pass through a reduced diameter or irregular well section.

Description

Centralizer

Technical Field

The utility model belongs to the technical field of drilling engineering cementing tool technique and specifically relates to a centralizer is related to.

Background

In oil well cementing engineering, a centralizer plays an important role in ensuring the centering degree of a borehole inner casing, and is usually arranged outside the casing in order to ensure the well cementing quality.

The centralizer comprises an elastic centralizing piece, an upper hoop and a lower hoop, two ends of the elastic centralizing piece are respectively connected with the upper hoop and the lower hoop, and the elastic centralizing piece is arranged in parallel with the axis of the hoop. During the running-in process of the centralizer, the posture is not easy to adjust and smoothly passes through when a hole shrinkage well section or a well section with an irregular well diameter is met.

Therefore, how to facilitate the centralizer to pass through a section of a hole with a reduced diameter or an irregular hole diameter is a technical problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a centralizer, which can facilitate the centralizer to pass through a hole section with a reduced diameter or an irregular hole diameter.

In order to achieve the above object, the present invention provides the following solutions:

a centralizer comprises an upper hoop, a lower hoop and an elastic centralizing piece, wherein the upper hoop and the lower hoop are coaxially arranged, and the elastic centralizing piece is a spiral centralizing piece;

the maximum outer diameter of the elastic righting piece is larger than the outer diameter of the upper hoop, and the maximum outer diameter of the elastic righting piece is larger than the outer diameter of the lower hoop;

the elastic righting piece (3) is detachably connected with the upper hoop (1) and the lower hoop (2) through screws.

In a specific embodiment, the number of the elastic righting sheets is at least 4, and the elastic righting sheets are spirally and uniformly distributed between the upper hoop and the lower hoop in the same direction.

In another specific embodiment, the helix angle of the elastic right sheet is greater than 0 ° and the helix angle of the elastic right sheet is less than 15 °.

In another specific embodiment, the elastic stabilizing sheet is integrally connected with the upper hoop and the lower hoop.

In another specific embodiment, the connection between the elastic righting piece and the upper hoop is provided with a first transition fillet.

In another specific embodiment, the connection between the elastic righting piece and the lower hoop is provided with a second transition fillet.

In another specific embodiment, the outer diameter of the upper hoop is equal to the outer diameter of the lower hoop.

In another specific embodiment, the spring-righting tab is a leaf spring.

According to the utility model discloses an each embodiment can make up as required wantonly, and the embodiment that obtains after these combinations is also in the utility model discloses the scope is the utility model discloses a part of the concrete implementation mode.

In a specific embodiment of the utility model, when using the utility model discloses a during the centralizer, carry out the casing pipe operation with the centralizer suit in the sheathed tube outside, because the external diameter of the biggest of elasticity centralizer piece is greater than the external diameter of upper hoop ring and lower hoop ring simultaneously, consequently, when the centralizer passes through undergauge or the anomalous well section of footpath, the contact takes place with the wall of a well earlier for elasticity centralizer piece can take lead to, and drives away the sleeve pipe and leave the wall of a well, ensures the degree of residence of sleeve pipe in the well. The elastic centralizing pieces are spirally distributed in the same direction, so that the centralizer can rotate under the action of the friction force of the well wall in the running-in process, the centralizing posture of the centralizer can be conveniently adjusted, and the centralizer can smoothly pass through a reduced diameter or irregular well section.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without any novelty.

Fig. 1 is a schematic front view of the centralizer provided by the present invention;

fig. 2 is a schematic view of a top view structure of the centralizer provided by the present invention.

Wherein, in fig. 1-2:

the hoop comprises an upper hoop 1, a lower hoop 2, an elastic righting sheet 3, a first transition fillet 4 and a second transition fillet 5.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without making novelty work belong to the protection scope of the present invention.

Example one

As shown in fig. 1-2, the present invention provides a centralizer. Wherein, the centralizer comprises an upper hoop 1, a lower hoop 2 and an elastic centralizing piece 3.

The both ends of elasticity piece 3 are right fixed with upper hoop 1 and lower hoop 2 respectively, and specifically, upper hoop 1 is located the top of elasticity piece 3, and lower hoop 2 is located the bottom of elasticity piece 3, and upper hoop 1 and the coaxial setting of lower hoop 2. The elastic righting piece 3 has certain elasticity, and the number of the elastic righting pieces can be any number.

The elastic righting piece 3 is a spiral righting piece, so that the centralizer can rotate under the action of the elastic righting piece 3 and the friction force of the well wall, and the righting posture of the centralizer can be adjusted conveniently.

The maximum outer diameter of the elastic righting piece 3 is larger than the outer diameter of the upper hoop 1, and the maximum outer diameter of the elastic righting piece 3 is larger than the outer diameter of the lower hoop 2. It should be noted that the maximum outer diameter of the elastic centralizer 3 refers to the maximum vertical distance from the outer side surface of the elastic centralizer 3 to the axis of the upper hoop.

When using the utility model discloses a during centralizer, carry out the casing pipe operation in the sheathed tube outside with centralizer suit, because the biggest external diameter of elasticity piece 3 is greater than the external diameter of upper hoop 1 and lower hoop 2 simultaneously, consequently, when centralizer passes through undergauge or the anomalous well section of well footpath, elasticity piece 3 can take lead to the contact with the wall of a well earlier to drive away the sleeve pipe and leave the wall of a well, ensure the degree of centering of sleeve pipe in the well. Because the elastic righting pieces 3 are spirally distributed in the same direction, the centralizer can rotate under the action of the friction force of the well wall in the running-in process, the righting posture of the centralizer can be conveniently adjusted, and the centralizer can smoothly pass through a hole shrinkage or irregular well section.

Example two

The utility model provides a second embodiment, the structure of the centralizer in this embodiment and the centralizer in embodiment one is similar, just has not been repeated to the same part, only introduces the difference.

In this embodiment, the utility model discloses a number of elasticity piece 3 is 4 at least, needs to explain that, elasticity piece 3 also can be below 4, in this embodiment, the number of using elasticity piece 3 to right is 4 at least as an example.

The elastic righting sheets 3 are spirally and uniformly distributed between the upper hoop 1 and the lower hoop 2 in the same direction. The elastic centralizing pieces 3 which are spirally distributed in the same direction can enable annular fluid to generate spiral turbulence and improve annular fluid state, so that the well cementation replacement efficiency can be improved, and further, the well cementation quality is improved.

Further, the utility model discloses a helical angle of elasticity piece 3 of righting is greater than 0, and the helical angle of elasticity piece 3 of righting is less than 15. The helix angle of the elastic-straightening sheet 3 may be adjusted as necessary.

Further, the utility model discloses an elasticity is right piece 3 and is connected with

last hoop

1 and 2 integrated into one piece of hoop down, has increaseed elasticity and has right between piece 3 and the last hoop 1 and elasticity right piece 3 and hoop 2 down between the joint strength down. The connection between the elastic stabilizing sheet 3 and the upper hoop 1 and the lower hoop 2 may be a detachable connection such as welding or a screw.

Further, the utility model discloses a junction that piece 3 and last hoop 1 were right to elasticity is provided with first transition fillet 4, has reduced the stress concentration of the junction that piece 3 and last hoop 1 were right to elasticity. It should be noted that a chamfer may be provided instead of the first transition fillet 4.

Further, the utility model discloses a junction that piece 3 and hoop 2 down are right to elasticity is provided with second transition fillet 5, has reduced the stress concentration of the junction of piece 3 and hoop 2 down is right to elasticity. It should be noted that a chamfer may be provided instead of the second transition fillet 5.

Further, the utility model discloses an outer diameter of going up hoop 1 equals with the outer diameter of hoop 2 down, is convenient for go up hoop 1 and hoop 2's manufacturing down.

Further, this real novel elastic righting piece 3 that discloses is the spring leaf, and it should be explained that elastic righting piece 3 also can be other elastic sheet that have elasticity.

Use the utility model discloses a during centralizer, with the centralizer suit outside the sleeve pipe and carry out the casing pipe operation down, because the biggest external diameter that piece 3 was right to elasticity is greater than the external diameter of upper hoop 1 and lower hoop 2, consequently, piece 3 can at first take place to contact with the wall of a well is right to elasticity to drive away the sleeve pipe and leave the wall of a well, ensure the degree of centering of sleeve pipe in the well. The elastic righting pieces 3 are spirally distributed in the same direction, so that the righting device can rotate under the action of the friction force of the well wall in the running process, the righting posture can be conveniently adjusted, and the well section with the reduced diameter or irregular well diameter can be smoothly passed; in addition, the elastic centralizing pieces 3 which are spirally distributed in the same direction can also enable annular fluid to generate spiral turbulence, and annular fluid state is improved, so that well cementation replacement efficiency can be improved, and well cementation quality is improved.

To sum up, the utility model provides a centralizer can take place to rotate at the lower casing in-process, ensures smoothly through the anomalous well section of undergauge or well diameter, simultaneously, still can effectively disturb annular space fluid, improves the annular space flow state, improves well cementation replacement efficiency, improves the well cementation quality.

It should be noted that the terms indicating the directions such as top, bottom, up, down, etc. in the present document are set in the directions of fig. 1 in the specification, and are used for convenience of description only and have no other specific meanings.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.

The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A centralizer comprises an upper hoop (1), a lower hoop (2) and an elastic centralizing piece (3), wherein the upper hoop (1) and the lower hoop (2) are coaxially arranged, and the centralizer is characterized in that the elastic centralizing piece (3) is a spiral centralizing piece;

the maximum outer diameter of the elastic righting piece (3) is larger than the outer diameter of the upper hoop (1), and the maximum outer diameter of the elastic righting piece (3) is larger than the outer diameter of the lower hoop (2);

2. Centralizer, according to claim 1, characterized by the fact that the number of said elastic righting blades (3) is at least 4 and is uniformly distributed helically in the same direction between said upper hoop (1) and said lower hoop (2).

3. Centralizer according to claim 1, characterized in that the helix angle of the elastic righting tab (3) is greater than 0 ° and the helix angle of the elastic righting tab (3) is less than 15 °.

4. Centralizer according to claim 1, characterized in that the connection of the elastic righting tab (3) with the upper hoop (1) is provided with a first transition fillet (4).

5. A centralizer as claimed in any one of claims 1-4, characterised in that the connection of the resilient centralizer sheet (3) to the lower hoop (2) is provided with a second transition radius (5).

6. A centraliser according to any one of claims 1-4, characterised in that the outer diameter of the upper hoop (1) is equal to the outer diameter of the lower hoop (2).

7. A centraliser according to any one of claims 1-4, characterised in that the resilient centraliser segment (3) is a spring segment.