CN201560724U

CN201560724U - Roller type low-friction resistance rigid casing centralizer

Info

Publication number: CN201560724U
Application number: CN2009203069910U
Authority: CN
Inventors: 周战云; 陈道元; 陈永军; 常伟; 孙杰
Original assignee: Cementing Engineering Office Of Sinopec Group Zhongyuan Petroleum Exploration Bureau; China Petrochemical Corp
Current assignee: Cementing Engineering Office Of Sinopec Group Zhongyuan Petroleum Exploration Bureau; China Petrochemical Corp
Priority date: 2009-07-28
Filing date: 2009-07-28
Publication date: 2010-08-25
Anticipated expiration: 2019-07-28

Abstract

The utility model relates to a roller type low-friction resistance rigid casing centralizer, which belongs to the technical field of casing centralizers used in well drilling and well completion construction for exploration and development of petroleum and natural gas fossil energy. The roller type low-friction resistance rigid casing centralizer comprises a main body, a rolling bearing and a roller shaft. The main body is a tubular body with an annular cross section, and a plurality of centralizing strips in even number are uniformly distributed on the outer tube wall of the main body; and the rolling bearing is fixed on the centralizing strips through the roller shaft and is in rolling friction with the roller shaft as well as the well wall. The double-rolling friction can effectively reduce the resistance of a casing entering a highly-deviated well or a horizontal well, and ensure the centralization of the casing in the well pit of the highly-deviated well or the horizontal well, so as to ensure smooth construction and improve well cementation quality.

Description

Roller type hangs down frictional resistance sleeve pipe rigidity centralizer

Technical field

The utility model relates to the low frictional resistance sleeve pipe rigidity centralizer of a kind of roller type, belongs to oil, the working sleeve pipe erection device of the underground energy exploration production drilling of natural gas completion technical field.

Background technology

In oil, natural gas probing development process, in order to make big gradient and horizontal well when the completion, sleeve pipe can either be placed in the middle in well, again can be with lower frictional force smoothly down to the design well depth, the designer mostly tends to adopt rolling friction formula sleeve pipe rigidity centralizer to guarantee that sleeve pipe sets upright effect.And the rigid casing centralizer that generally adopts at present, low frictional resistance sleeve pipe rigidity centralizer (number of patent application: 91224622.7, authorize publication number: CN2120175), the sleeve pipe rolling wheel centralizer (number of patent application: 200820103420.2, authorize publication number: CN201196035) all have different defectives separately.The rigid casing centralizer is by centralizer body and protrude spiral on the body cylindrical or vertical-type is set upright rib and formed, though this kind centralizer can guarantee to set upright effect, is sliding friction when still going into well and between the borehole wall, and it is bigger that sleeve pipe is gone into well resistance; Low frictional resistance casing stabbing board by centralizer body, set upright rib and be embedded in the steel ball of setting upright in the rib and form, though can becoming sliding friction, this kind centralizer is rolling friction, but steel ball and borehole wall contact area are less, be easy to because of the stressed excessive borehole wall that is absorbed in, the effect that frictional force reduces is unsatisfactory.The sleeve pipe rolling wheel centralizer is then set upright several parts such as rib, oval window, axle, roller, dog screw, slip-off preventing card, screw hole and is formed by body, spiral, structure more complicated not only, and owing to still be sliding friction between roller and the axle, when radial force is big slightly, axle easy deformation and cause frictional force further to increase, drag-reduction effect is not very desirable.

The utility model content

The purpose of this utility model is exactly to eliminate the deficiency of existing casing stabbing board, fully reduce well resistance under high angle hole and the horizontal well casing pipe, provide the low frictional resistance sleeve pipe rigidity centralizer of a kind of roller type to guarantee that sleeve pipe goes into well smoothly, guaranteeing to set upright on the basis of effect simultaneously, guarantee cementing quality.

The utility model is made up of body, rolling bearing, roller shaft, and body is a tubular body, and cross section is an annular, is evenly equipped with righting strip by even number on the body outer tube wall; Rolling bearing is fixed on the righting strip by roller shaft.

The utility model can effectively reduce high angle hole and horizontal well casing pipe is gone into well resistance, guarantees high angle hole and the horizontal well casing pipe centralizer in well, and then guarantees that construction smoothly, improves cementing quality.

Description of drawings

Fig. 1 is the low frictional resistance sleeve pipe rigidity centralizer front view of roller type;

Fig. 2 is the A-A sectional view of the low frictional resistance sleeve pipe rigidity centralizer of roller type.

Among the figure: 1-body, 2-rolling bearing, 3-roller shaft, 4-righting strip.

The specific embodiment

By shown in Figure 1, the utility model is made up of body 1, rolling bearing 2, roller shaft 3, and body 1 is a tubular body, and cross section is an annular, is evenly equipped with righting strip 4 by even number on body 1 outer tube wall, can be 3-6; Rolling bearing 2 is fixed on the righting strip 4 by roller shaft 3.

The utility model is installed in down on the casing by designing requirement, be rolling friction between rolling bearing 2 and the roller shaft 3, simultaneously, also become rolling friction between the rolling bearing 2 and the borehole wall, pass through double scrolling, frictional resistance when reducing sleeve pipe greatly and going into well guarantees that sleeve pipe transfers to projected depth in horizontal hole.

Claims

1. a roller type hangs down frictional resistance sleeve pipe rigidity centralizer, form by body (1), rolling bearing (2), roller shaft (3), body (1) is a tubular body, and cross section is an annular, it is characterized in that being evenly equipped with righting strip (4) by even number on body (1) outer tube wall; Rolling bearing (2) is fixed on the righting strip (4) by roller shaft (3).