CN201116450Y

CN201116450Y - Elastic screw anti-drag rigidity centralizer

Info

Publication number: CN201116450Y
Application number: CNU2007200818330U
Authority: CN
Inventors: 聂荣国
Original assignee: SICHUAN FIBLE OIL ENGINEERING TECHNOLOGY Co Ltd
Current assignee: Chengdu Western UnionPetro Engineering Technology Co., Ltd.
Priority date: 2007-11-08
Filing date: 2007-11-08
Publication date: 2008-09-17
Anticipated expiration: 2017-11-08

Abstract

The utility model discloses a flexible helical anti-drag rigid centralizer, which comprises a cylinder body and centralizing rib plates, wherein the centralizing rib plates are welded on the circumferential outer wall of the cylinder body and formed in arc shape, an included angle is formed between the centralizing rib plates and the radial direction of the cylinder body, and the centralizing rib plates are hollow enclosed helical flexible rigid centralizing rib plates. The hollow flexible helical centralizing rib plates can both bear large pressure and produce shrinkage strain when meeting highly strong pressure, and can recover the original form and rigidity when the highly strong pressure disappears, thereby well resolving the problem that solid centralizing rib plates are hindered because of incapability of deforming when meeting highly strong pressure. Simultaneously, the inclined centralizing rib plates lead cement slurry to produce turbulent current in well cementing operations, thereby greatly increasing the well cementing quality of cement slurry.

Description

Elastic helix drag reduction rigidity centralizer

Technical field

The utility model relates to a kind of centralizer, relates in particular to the elastic helix drag reduction rigidity centralizer that is used to set upright sleeve pipe in a kind of drilling process.

Background technology

In (oil, geology etc.) drilling process, well cementation is a very important job, its general method is: after brill reaches required drilling depth, need sleeve pipe be fixed on the center of well with cement paste, in order sleeve pipe to be fixed on the center of well as far as possible, now generally adopt the method that centralizer is installed outside sleeve pipe, centralizer adopts the mode of part evagination in the outside wall surface, make centralizer be in the center of well as far as possible, thereby make bunch tube be fixed on the center of well as far as possible.

Existing casing stabbing board mainly is divided into two kinds by its effect: spring-backed quill centralizer and rigidity casing stabbing board, the spring-backed quill centralizer is the Lantern structure, there is cylindrical shell at its two ends, several bandy elastic steel strips in middle part are installed between two ends, and such structure is convenient to by the vicissitudinous borehole segments of hole diameter.The defective of this casing stabbing board is: the elastic steel strip of centralizer may be obstructed because of wiping the extension borehole wall, so the spring-backed quill centralizer generally only is applied to common straight well, high angle hole and horizontal well is not all used; The body of rigidity casing stabbing board is the through-type cylindrical shell of a circumference closure, is distributed with the solid gusset of setting upright in the outer circumferential walls of cylindrical shell, and the mode that the mode of generally setting upright the casting of gusset and this body and function is made integral body or welding is rigidly connected.The setting upright gusset and can take place to wipe not hang and can in various types of wells, use of this centralizer with the borehole wall, but the righting rib slab is strong, and the back that is hampered itself is difficult to sex change takes place, and makes down the well resistance increase.

Summary of the invention

The purpose of this utility model provides a kind of elastic helix drag reduction rigidity centralizer with regard to being in order to address the above problem, this centralizer had both had the advantage of common rigidity casing stabbing board, be applicable in various types of wells, simultaneously again can be when meeting with obstruction by self rotation or generation part elastic deformation, avoid hindering, to reach the purpose under the smooth lower going-into-well of the resistance of reducing friction.

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

The utility model comprises cylindrical shell and set upright gusset, wherein sets upright gusset and is welded in the cylindrical shell outer circumferential walls, and is curved, and setting upright between the radial direction of gusset and cylindrical shell has angle, describedly sets upright the spirality elasticity rigidity righting rib plate that gusset is the sealing of hollow structure.

It is bigger that the elasticity of hollow structure is set upright the gusset pressure-bearing surface, and be the arc of sealing, can bear bigger pressure, shrinkage strain when running into high pressure in the part, thus can go into the well smoothly.Elasticity is set upright gusset can recover its original shape after external force disappears, thereby bunch tube is played centralizing function, makes bunch tube be in the center of well.With the utility model lower going-into-well following time, as run into stopping of part borehole wall projection, then the utility model can rotate under the gradient effect of setting upright gusset, thereby can avoid hindering, and the resistance of reducing friction guarantees that whole pipe string is lowered to well smoothly.When filling concrete is starched, what the utility model was gradient sets upright gusset under the washing away of cement paste, can drive the utility model and rotate, thereby make cement paste produce turbulent flow, turbulent flow is the most desirable cement paste occupied state in the well cementing operation, can improve cementing quality widely.

As optimal technical scheme of the present utility model, the angle between the described radial direction of setting upright gusset and cylindrical shell is 23 degree.

Angle between the described radial direction of setting upright gusset and cylindrical shell can be 20 degree.

Angle between the described radial direction of setting upright gusset and cylindrical shell can be 25 degree.

Angle between the described radial direction of setting upright gusset and cylindrical shell can be 30 degree.

Test shows that above-mentioned four angles and the angle between them all are more satisfactory angles.

Set upright the optimal technical scheme of gusset quantity as the utility model, the described quantity of setting upright gusset can be 4 to 8 according to the size of casing size.Test shows, the above-mentioned quantity of setting upright gusset manufacture, aspect such as cost, result of use can obtain more satisfactory resultant effect.

The beneficial effects of the utility model are:

The utility model is because elasticity is set upright the unique design of gusset: can avoid the obstruction that the borehole wall protrudes from two aspects: the one, and elasticity is set upright the hollow helical structure of gusset, can bear bigger pressure, can run into the elastic deformation that high pressure can produce the part again, can avoid preferably hindering; The 2nd, setting upright gusset has constant slope, drives whole centralizer general name rotation in the moment that meets with obstruction, thereby avoids hindering, and has avoided the generation of the accident of Ka Jing.The gusset of setting upright of the present utility model can recover its original shape after high pressure disappears, sleeve pipe has still been played better centralizing function.And the utility model tilt set upright gusset and in the well cementing operation process, can make cement paste produce turbulent flow, thereby improved the cementing quality of cement paste widely.

Description of drawings

Fig. 1 is a front view of the present utility model;

Fig. 2 is the A-A sectional view (one of transverse sectional view) among Fig. 1;

Fig. 3 is two of a transverse sectional view of the present utility model;

Fig. 4 is three of a transverse sectional view of the present utility model;

Fig. 5 is four of a transverse sectional view of the present utility model;

Fig. 6 is five of a transverse sectional view of the present utility model.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is further described in detail:

As shown in Figure 1, the utility model comprises cylindrical shell 1 and sets upright gusset 2, wherein set upright the outer circumferential walls that gusset 2 is welded in cylindrical shell 1, curved, set upright between the radial direction of gusset 2 and cylindrical shell 1 angle is arranged, as shown in Figure 2, set upright gusset 2 and set upright gusset for the spirality high resiliency rigidity of the sealing of hollow structure.

The angle of setting upright between the radial direction of gusset 2 and cylindrical shell 1 can be 20 degree, 23 degree, 25 degree, 30 degree (unmarked angle among the figure).Test shows that above-mentioned three angles and the angle between them all are more satisfactory angles.

As shown in Figure 2, the quantity of setting upright gusset 2 can be 4.

As shown in Figure 3, the quantity of setting upright gusset 2 can be 5.

As shown in Figure 4, the quantity of setting upright gusset 2 can be 6.

As shown in Figure 5, the quantity of setting upright gusset 2 can be 7.

As shown in Figure 6, the quantity of setting upright gusset 2 can be 8.

Test shows, the above-mentioned quantity of setting upright gusset 2 manufacture, aspect such as cost, effect can obtain more satisfactory resultant effect.

In conjunction with Fig. 1---Fig. 6, the elasticity rigidity righting rib plate 2 of hollow helical structure can bear bigger pressure, can produce local plastic strain again when running into high pressure, and can recover its original shape after high pressure disappears.In the use, with the utility model lower going-into-well intraocular the time, as run into the obstruction of part borehole wall ridge, then the utility model can rotate by plastic strain with under the gradient effect of setting upright gusset 2, goes into the well smoothly thereby avoiding obstacles guarantees bunch tube; When filling concrete was starched, the utility model can be set upright gusset 2 and can rotate under cement paste ground washes away gradient, thereby makes cement paste produce turbulent flow.Turbulent flow is the most desirable cement paste occupied state in the well cementing operation, thereby can improve cementing quality widely.

Claims

1, a kind of elastic helix drag reduction rigidity centralizer, comprise cylindrical shell and set upright gusset, wherein set upright gusset and be welded in the cylindrical shell outer circumferential walls, curved, setting upright between the radial direction of gusset and cylindrical shell has angle, it is characterized in that: the described gusset of setting upright is that the spirality high resiliency rigidity of the sealing of hollow structure is set upright gusset.

2, elastic helix drag reduction rigidity centralizer according to claim 1 is characterized in that: the angle between the described radial direction of setting upright gusset and cylindrical shell is 23 degree.

3, elastic helix drag reduction rigidity centralizer according to claim 1 is characterized in that: the angle between the described radial direction of setting upright gusset and cylindrical shell is 20 degree.

4, elastic helix drag reduction rigidity centralizer according to claim 1 is characterized in that: the angle between the described radial direction of setting upright gusset and cylindrical shell is 25 degree.

5, elastic helix drag reduction rigidity centralizer according to claim 1 is characterized in that: the angle between the described radial direction of setting upright gusset and cylindrical shell is 30 degree.

6, according to claim 1---the described elastic helix drag reduction of any one claim rigidity centralizer in 5, it is characterized in that: the described quantity of setting upright gusset is 4.

7, according to claim 1---the described elastic helix drag reduction of any one claim rigidity centralizer in 5, it is characterized in that: the described quantity of setting upright gusset is 5.

8, according to claim 1---the described elastic helix drag reduction of any one claim rigidity centralizer in 5, it is characterized in that: the described quantity of setting upright gusset is 6.

9, according to the described elastic helix drag reduction of any one claim rigidity centralizer in the claim 15, it is characterized in that: the described quantity of setting upright gusset is 7.

10, according to claim 1---the described elastic helix drag reduction of any one claim rigidity centralizer in 5, it is characterized in that: the described quantity of setting upright gusset is 8.