CN203066893U

CN203066893U - Centering device for reaming well section

Info

Publication number: CN203066893U
Application number: CN 201320008171
Authority: CN
Inventors: 陈洋; 王东; 郑军
Original assignee: Sichuan Better Oil Technology Co Ltd
Current assignee: Sichuan Better Oil Technology Co Ltd
Priority date: 2013-01-08
Filing date: 2013-01-08
Publication date: 2013-07-17
Anticipated expiration: 2023-01-08

Abstract

The utility model discloses a centering device for a reaming well section. The centering device for the reaming well section comprises two end cylinders with same diameters and a plurality of elastic centering strips which are connected between the two end cylinders, the two ends of the elastic centering strips are vertical elements which have the same axial direction with the end cylinders, the middle sections of the elastic centering strips are convex circular arc strips, and the two end cylinders and all the elastic centering strips are of an integrated structure. The two ends of elastic centering strips in a traditional centering device are free of a vertical element structure. Good elasticity is acquired due to the fact that the vertical elements are arranged at the two ends of the elastic centering strips of the centering device for the reaming well section, and the centering device can easily pass the reaming well section and maintain elasticity. Compared with a structure of welding the end cylinders and the centering strips in a connection mode, the centering device for the reaming well section applies the integrated structure of the end cylinders and the centering strips, the whole structure is stable, large extrusion force can be borne, the centering strips have sufficient elasticity and adaptability, so that the high centering degree of the centering device can be guaranteed, and strong adaptability is provided.

Description

Reaming hole well section centralizer

Technical field

The utility model relates to a kind of elastic centralizer, relates in particular to a kind of reaming hole well section centralizer.

Background technology

Centralizer is used for oil gas field makes sleeve pipe keep in well between two parties when being lowered to sleeve pipe, to improve cementing quality.Centralizer is divided into elastic centralizer and rigidity centralizer, and the righting strip of elastic centralizer is applicable to relatively that because having elasticity the well interior diameter changes greatly or gradient oil gas field greatly.Existing elastic centralizer, the two ends of its elasticity righting strip directly are connected with the end tube, the stage casing that is almost the righting strip entire length is circular arc to outer lug, it is no problem that this centralizer uses in the little well of internal diameter varies, but when reaming hole well section was used, centralizer will pass through very long upper strata sleeve pipe, and the external diameter of centralizer is bigger than the internal diameter of upper strata sleeve pipe, tripping force can appear, to transfer power big, causes sleeve pipe to be lowered to problems such as difficulty.In addition, traditional elastic centralizer adopts a plurality of elasticity righting strips to be welded in two structures between the end tube, its shortcoming is: owing to be welded construction, so its firm degree is influenced by welding quality, the situation that may occur the damage because welding quality is not high in the use brings hidden danger for the safe handling of centralizer; The pressure that welded construction can be born centralizer is also more limited, elastic centralizer is damaged, and the elasticity righting strip is in needing than the The Small Well section by diameter during contracting, its elasticity and compliance are all not enough, may cause centralizer or to be damaged by minor diameter well section, thereby it is placed in the middle that sleeve pipe is difficult in well, has a strong impact on cementing quality.

The utility model content

The purpose of this utility model provides a kind of elastomeric reaming hole well section centralizer with regard to being in order to address the above problem.

The utility model is achieved through the following technical solutions above-mentioned purpose:

Reaming hole well section centralizer described in the utility model, comprise two with the end tube of diameter and be connected in described two many elasticity righting strips of holding between the tube, the two ends of described elasticity righting strip are and the homoaxial vertical element of described end tube that the stage casing of described elasticity righting strip is evagination circular arc bar; The length difference of two vertical elements at same described elasticity righting strip two ends, the length difference of two vertical elements of the same end of two adjacent described elasticity righting strips; Described elasticity righting strip add up to even number; Be integrated between described two end tubes and all described elasticity righting strip.Said structure make the elasticity righting strip to the position of the arc section of outer lug not in the stage casing of righting strip, but be positioned at the stage casing but a close wherein end, arc section on two adjacent described elasticity righting strips is staggeredly located, and then another is partial to the lower end to be partial to the upper end as one.When entering the less upper strata sleeve pipe of internal diameter, distributions because the arc section on the righting strip interlaces, initially the quantity of the righting strip of pressurized has only half of righting strip sum, so the tripping force of centralizer is little.After entering the upper strata sleeve pipe, the distribution because the arc section on the righting strip interlaces, setting upright of obtaining a little is distributed in end positions, stressed more uniform and stable, frictional force reduces, be not prone to the stifled fault of card so the power of transferring is little, make the rotation of the axially-movable of sleeve pipe and circumferencial direction smooth, be more conducive to being lowered to of sleeve pipe.After passing through the upper strata sleeve pipe, because end tube and elasticity righting strip are integrated, it is very big that the elasticity of this structure permission elasticity righting strip can be done, thereby make the elasticity righting strip can produce bigger resilience in the reaming hole section, guarantees that sleeve pipe occupy the well center.

As preferably, described elasticity righting strip is six.

The beneficial effects of the utility model are:

The circular arc raised section of comparing the righting strip of traditional elastic centralizer is positioned at the centre position of righting strip, the position of the circular arc raised section of elasticity righting strip of the present utility model is positioned at the stage casing but a close wherein end, arc section on two adjacent elasticity righting strips is staggeredly located, when entering the less upper strata sleeve pipe of internal diameter, the distribution because the arc section on the righting strip interlaces, the quantity of the righting strip of initial pressurized has only half of righting strip sum, so the tripping force of centralizer is little; After entering the upper strata sleeve pipe, the distribution because the arc section on the righting strip interlaces, setting upright of obtaining a little is distributed in end positions, stressed more uniform and stable, frictional force reduces, be not prone to the stifled fault of card so the power of transferring is little, make the rotation of the axially-movable of sleeve pipe and circumferencial direction smooth, be more conducive to being lowered to of sleeve pipe; After entering diameter and becoming big reaming hole section, because end tube and elasticity righting strip be integrated, thus the elastic centralizer that the elasticity righting strip can the be more traditional bigger resilience of generation and can not damaging, thus the centralizer of sleeve pipe guaranteed.

Description of drawings

Fig. 1 is the front view that reaming hole well section described in the utility model is used centralizer;

Fig. 2 is the front view of reaming hole well section described in the utility model when using with centralizer.

The specific embodiment

The utility model is described in further detail below in conjunction with accompanying drawing:

As shown in Figure 1, reaming hole well section centralizer described in the utility model, comprise two with the end tube 1 of diameter and be connected in two many elasticity righting strips between the end tube 1, the two ends of elasticity righting strip are and end tube 1 homoaxial vertical element 3 that the stage casing of elasticity righting strip is evagination circular arc bar 2; The length difference of two vertical elements 3 at same elasticity righting strip two ends, the length difference of two vertical elements 3 of the same end of two adjacent elasticity righting strips; The elasticity righting strip add up to 6, also can be other even number; Be integrated between two end tubes 1 and all elasticity righting strip.

As shown in Figure 2, when centralizer of the present utility model used in reaming hole well section, the reaming hole well section installed inside of the borehole wall 5 had upper strata sleeve pipe 4, and centralizer then is sleeved on the sleeve pipe 6 that is positioned; When centralizer is positioned at the enlarged diameter section of the borehole wall 5, because the external diameter of the evagination circular arc bar 2 in elasticity righting strip stage casing is much larger than the external diameter of the sleeve pipe 6 that is positioned, so evagination circular arc bar 2 makes the sleeve pipe 6 that is positioned occupy center in the borehole wall 5 as far as possible; At centralizer during through upper strata sleeve pipe 4, at first make the end tube 1 of diameter minimum through in the upper strata sleeve pipe 4, be that the vertical element 3 of elasticity righting strip one end (upper end among Fig. 2) is through in the upper strata sleeve pipe 4 then, the vertical element 3 that begins to have only 3 elasticity righting strips is through in the upper strata sleeve pipe 4, and the vertical element 3 of other three elasticity righting strips is again through in the upper strata sleeve pipe 4 then; When the evagination circular arc bar 2 of elasticity righting strip during through upper strata sleeve pipe 4, because the external diameter of evagination circular arc bar 2 is greater than the internal diameter of upper strata sleeve pipe 4, the interior contracting so can be squeezed, but because the evagination circular arc bar 2 that once has only 3 elasticity righting strips is through upper strata sleeve pipe 4, so that its tripping force is compared the evagination circular arc bar 2 of 6 traditional elasticity righting strips is littler through upper strata sleeve pipe 4 simultaneously; In this process, the pressure that evagination circular arc bar 2 is subjected to can pass to the vertical element 3 at two ends, because vertical element 3 itself has elasticity, so the dual elasticity of vertical element 3 and evagination circular arc bar 2 makes whole centralizer can't damage centralizer by upper strata sleeve pipe 4 smoothly, restore to the original state under its elastic reaction by its elasticity righting strip of back, continue performance and make the sleeve pipe 6 of being positioned effect placed in the middle.

Claims

1. reaming hole well section centralizer, comprise two with the end tube of diameter and be connected in described two many elasticity righting strips of holding between the tube, it is characterized in that: the two ends of described elasticity righting strip are and the homoaxial vertical element of described end tube that the stage casing of described elasticity righting strip is evagination circular arc bar; The length difference of two vertical elements at same described elasticity righting strip two ends, the length difference of two vertical elements of the same end of two adjacent described elasticity righting strips; Described elasticity righting strip add up to even number; Be integrated between described two end tubes and all described elasticity righting strip.

2. reaming hole well section centralizer according to claim 1, it is characterized in that: described elasticity righting strip is six.