CN213807594U - Centralizer with well hole trimming function - Google Patents

Abstract

The utility model discloses a centralizer with a well finishing function, which belongs to the field of drilling engineering equipment, wherein a centralizer body is cylindrical, a plurality of grooves are uniformly arranged on the centralizer body along the circumferential direction of the cross section, and rollers are arranged in the grooves; the roller is divided into a cylindrical profile arranged in the middle and tapered profiles arranged on two sides of the roller, the surface of the cylindrical profile is provided with second hard teeth, and the surface of the tapered profile is provided with first hard teeth; the centering device also comprises a main shaft arranged in the center of the roller, wherein the length of the main shaft is greater than that of the roller, two ends of the main shaft are connected with the centering device body through fixing structures, and bearing groups sleeved on the main shaft are arranged on two sides of the roller; the utility model discloses increased the space between centralizer and the well, improved the mobility of drilling fluid, the cleanness of detritus and the trafficability characteristic of drilling tool, reduced the risk of taking place the accident in the pit, more effectively improved the maintained well effect of the gyro wheel that plays broken rock effect.

Description

Centralizer with well hole trimming function

Technical Field

The utility model relates to a drilling engineering equipment field, in particular to centralizer with function is maintained to well.

Background

Currently, centralizers, also known as stabilizers, are petroleum downhole tools that are attached to a petroleum drill string or are part of a bottom hole assembly, and can be divided into two categories, a drill string centralizer and a bottom hole assembly, depending on the position of the drill string, and their functions include: the well track is controlled, the functions of centralizing and supporting points are realized in the drill string, and the well track and the curvature are controlled together with other components of the drill string; the method comprises the following steps of (1) well hole trimming, wherein the centralizer can perform certain reaming on the shrinkage or bending of a well hole in the drilling process of a drilling column, perform certain trimming on the irregularity of the well wall, and improve the well bore quality; the vibration of the drill stem is reduced, the violent vibration of the drill stem and a bottom hole assembly in a borehole in the drilling process is reduced, the service life of the tool is prolonged, and meanwhile, the abrasion of the tool is reduced.

The centralizer can be divided into an integral centralizer, a replaceable sleeve centralizer, a roller centralizer and the like according to the structure, wherein the roller centralizer is characterized in that three rollers capable of freely rotating are mounted on a body, and the roller centralizer has the functions of a conventional centralizer, and besides the functions of the conventional centralizer, the rotating rollers contact a well wall, so that the friction force between the centralizer and the well wall can be greatly reduced; meanwhile, for the abnormal conditions of borehole shrinkage, borehole irregularity and the like which often occur, the rollers of the roller centralizer can be used for crushing and trimming rocks at abnormal positions of the borehole wall to form a regular borehole diameter, so that the drilling quality is improved; roller centralizers are also known as reamers because of their wellbore-trimming function.

At present, the main structural forms of the domestic roller centralizer are composed of a centralizer body, rollers, roller shafts, a fixing structure, fixing bolts and the like. One of the major problems with its use in drilling applications is: the freely rotating rollers, roller shafts, fixing structures and the like are all arranged on ribs protruding from the body, for example, the three-roller centralizer is arranged on three ribs protruding from the body, and the protruding ribs and the body are always taken as a firm whole, so that the whole roller centralizer is very heavy, the space between the centralizer and a well hole is reduced, the flowing of drilling mud and the cleaning of drilling debris are influenced, the movement of a drill column is influenced, and the risk of drilling accidents is increased; on the other hand, the raised rib wing as a fixed structure can not freely rotate like a roller, and the function of the raised rib wing is just similar to that of a conventional centralizer, and the raised rib wing can not play the roles of reducing friction force and rotating and crushing rocks.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the background art, the utility model aims to provide a centralizer with well is maintained function to solve the problem that proposes among the background art.

The purpose of the utility model is realized through the following technical scheme: a centralizer with a well hole trimming function comprises a centralizer body, wherein the centralizer body is cylindrical, three grooves are uniformly formed in the centralizer body in the circumferential direction of the cross section, and rollers are arranged in the grooves; the roller is divided into a cylindrical profile arranged in the middle and tapered profiles arranged on two sides of the roller, the radius of the roller at the tapered profile is gradually reduced from the part close to the cylindrical profile to two ends, second nut teeth are uniformly distributed on the surface of the cylindrical profile, and first nut teeth are uniformly distributed on the surface of the tapered profile; the roller further comprises a main shaft arranged in the center of the roller, the length of the main shaft is greater than that of the roller, two ends of the main shaft are connected with the centralizer body through fixing structures, bearing groups sleeved on the main shaft are arranged on two sides of the roller, the bearing groups sequentially comprise a second bearing, a first bearing and a buffer component from the roller to the outside, and the centralizer body is further provided with a water hole penetrating through the centralizer body;

further, the fixing structure is a fixing bolt or a wedge-shaped structure;

furthermore, the fixing structure also comprises a breathing hole which is arranged on the fixing structure in a penetrating way;

further, the first bearing and the second bearing are wear-resistant hard alloy bearings;

preferably, the first bearing and the second bearing are polycrystalline diamond bearings;

further, the shape of the roller is one of an ellipsoid shape, a stepped cylinder and a cone;

further, the buffer component is one of a disc spring, a rubber elastic body and a parallel spring group;

preferably, the number of grooves and rollers includes, but is not limited to, three.

Furthermore, only the roller (2) protruding out of the outline of the centralizer body (1)

The utility model discloses following positive technological effect has:

1. the utility model provides a design of gyro wheel centralizer, through the utility model discloses increased the space between centralizer and the well, improved the mobility of drilling fluid, the cleanness of detritus and the trafficability characteristic of drilling tool, reduced the risk of taking place the accident in the pit.

2. The roller centralizer provided by the invention has the advantages that the effect of an effective component, namely the roller, is maximized, only the roller with the functions of rotary trimming and centralizing is exposed out of the outline of the centralizer body, and the raised static flap is not arranged, so that the action area of the roller is increased, and the centering and trimming effects are improved.

3. The utility model adopts a brand-new design, the rotary roller consists of a cylinder outline with thicker middle part and outlines with gradually reduced sizes at two ends, and a large number of teeth are respectively arranged on the surface of each outline, thereby effectively improving the well trimming effect of the roller playing the role of breaking rocks; and a group of wear-resistant bearings are respectively arranged at the two ends of the roller for supporting, and a buffer part is used for buffering, so that the service life of the roller is prolonged.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

fig. 2 is a front view of the present invention;

fig. 3 is a schematic perspective view of the centralizer body of the present invention;

fig. 4 is a schematic perspective view of the roller and the fixing structure of the present invention;

fig. 5 is a schematic perspective view of the roller of the present invention;

fig. 6 is a schematic perspective view of the roller of the present invention;

in fig. 1-6: 1-a centralizer body; 2-a roller; 3-a fixed structure; 4-a groove; 5-water eye; 7-a main shaft; 8-a cushioning component; 9-a first bearing; 10-a second bearing; 11-a radial bearing; 21-a tapered profile; 22-cylinder profile; 23-a first solid tooth; 24-a second tooth; 31-a fixing bolt; 32-breathing hole.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Example one

As shown in fig. 1 to 4, the utility model relates to a centralizer with well finishing function, which comprises a centralizer body 1, wherein the centralizer body 1 is cylindrical, a plurality of grooves 4 are uniformly arranged on the centralizer body 1 along the circumferential direction of the cross section, and rollers 2 are arranged in the grooves 4; the roller 2 is divided into a cylindrical profile 22 arranged in the middle and tapered profiles 21 arranged on two sides of the roller, the radius of the roller 2 at the position of the tapered profile 21 is gradually reduced from the part close to the cylindrical profile 22 to two ends, second hard teeth 24 are uniformly distributed on the surface of the cylindrical profile 22, and first hard teeth 23 are uniformly distributed on the surface of the tapered profile 21; the roller 2 further comprises a main shaft 7 arranged at the center of the roller 2, the length of the main shaft 7 is larger than that of the roller 2, two ends of the main shaft 7 are connected with the centralizer body 1 through fixing structures 3, bearing sets are arranged on two sides of the roller 2 and sleeved on the main shaft 7, the bearing sets sequentially comprise a second bearing 10, a first bearing 9 and a buffer component 8 from the roller 2 to the outside, and the centralizer body 1 is further provided with a water hole 5 penetrating through the centralizer body 1.

The centralizer is characterized in that a plurality of grooves 4 are formed in a centralizer body 1, idler wheels 2 capable of rotating freely are mounted in the grooves 4 respectively, the idler wheels are fixed on the centralizer body 1 through fixing structures 3 at two ends, a water hole 5 penetrating through the centralizer body 1 is arranged and is used as an internal channel of drilling fluid, the outer contour of the centralizer body 1 is a regular cylinder, and only the idler wheels 2 exposed out of the surface of the cylinder are arranged; the external profile of the centralizer body cancels the protruding rib wing in the existing centralizer, so that two advantages can be obtained; one advantage has increased the space between centralizer and the well drilling well hole, has improved the mobility of the drilling fluid through this space, has reduced the risk that foreign matter such as detritus blocked here, and another advantage is that only can the free rotation's of exposing cylinder surface gyro wheel, does not have static convex muscle wing, has increased the rotatory broken active area of gyro wheel, has improved the repairment effect to the well hole.

Further, the roller 2 comprises a thicker cylindrical profile 22, and tapered profiles 21 with gradually reduced sizes are respectively arranged at the upper end and the lower end of the cylindrical profile 22; the thicker cylindrical profile 22, which mainly acts as a borehole centralizer, is provided with a large number of uniformly distributed second teeth 24 on its surface; the tapered profile 21, which is progressively smaller in size, mainly acts to trim the hole when the centralizer moves axially, being provided on its surface with a large number of first, uniformly distributed, teeth 23 capable of cutting rock; a main shaft 7 is arranged in the roller 2, the main shaft 7 can be fixed through the fixing structure 3, and the roller 2 can freely rotate on the main shaft 7; two groups of bearing sets are respectively arranged on the main shaft 7 at the upper end and the lower end of the roller 2, each bearing set comprises a second bearing 10 fixed with the roller 2, a first bearing 9 fixed with the fixed structure 3 and a buffer part 8 arranged between the first bearing 9 and the fixed structure 3; through the design, the centralizer body is taken as a relative coordinate system, the centralizer body 1, the fixed structure 3, the main shaft 7, the first bearing 9 and the buffer part 8 are relatively static parts, and the roller 2 and the second bearing 10 are relatively rotating parts; axial force loaded on the roller when the centralizer moves along the axial direction is loaded between the bearings, the bearings are lubricated and cooled through drilling fluid flowing through, and the buffer part 8 has a buffer effect on suddenly increased load.

The axial load of the roller 2 is borne by a second bearing 10, a first bearing 9 and a buffer part 8 which are respectively arranged at the upper end and the lower end, and the bearings are lubricated by drilling fluid flowing through; the radial load of the roller 2 is carried by a radial bearing 11 arranged in an inner hole of the roller 2 and the main shaft 7, the radial bearing 11 can be a copper alloy radial bearing with self-lubricating property, the matching surface of the main shaft 7 can be provided with a wear-resistant processing surface, and the radial bearings are lubricated by pre-filled lubricating grease.

Example two

On the basis of embodiment one, gyro wheel 2 passes through fixed knot to be constructed 3 to be fixed on centralizer body 1, and fixed knot constructs 3 and establishes respectively at the both ends of gyro wheel, and its structure cooperatees with recess 4, and fixed knot constructs 3 and can fix on centralizer body 1 through fixing bolt 31, does the equivalent replacement, also can fix on centralizer body 1 through the mode of wedge structure.

EXAMPLE III

On the basis of the first embodiment, a breathing hole 32 is additionally arranged on the fixed structure 3 to communicate the internal lubricating grease cavity with the external pressure.

Example four

On the basis of embodiment one, first bearing 9, second bearing 10 are wear-resisting carbide class bearing, the utility model discloses a bearing can be replaced by other bearings that have high wear resistance such as polycrystalline diamond bearing, preferably polycrystalline diamond bearing, and its reason is that polycrystalline diamond bearing has excellent surface wear resistance, surface hardness and long-time life.

EXAMPLE five

On the basis of the first embodiment, the outer contour of the roller 2 may be one of an ellipsoid, a stepped cylinder and a cone, and theoretically, a structure with a relatively continuous outer surface may be used in the specific shape of the roller 2 of the present invention.

EXAMPLE six

On the basis of the first embodiment, the utility model discloses a buffer unit 8 can adopt other similar structures that can play the cushioning effect, for example belleville spring, rubber elastic body, parallelly connected spring group etc..

EXAMPLE seven

On the basis of embodiment one, the utility model discloses a recess 4 is a plurality of, and is preferred three, follows the utility model discloses a concrete application scene, the utility model discloses a size has certain restriction, too few then can not reach the designing requirement, and too many will be very complicated again, and is just higher to the requirement of machining precision, through the experience of long-term application, the recess sets up to have better implementation effect when three.

In the foregoing, various embodiments of the present invention have been described with reference to specific examples. However, it should be understood that: the description of the various embodiments is not intended to limit the invention. The above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, which is defined by the claims.

Claims (9)

1. A centralizer with a well finishing function comprises a centralizer body (1) and is characterized in that,

the centralizer body (1) is cylindrical, a plurality of grooves (4) are uniformly formed in the centralizer body (1) along the circumferential direction of the cross section, and rollers (2) are arranged in the grooves (4);

the roller (2) is divided into a cylindrical profile (22) arranged in the middle and tapered profiles (21) arranged on two sides of the roller, the radius of the roller (2) at the position of the tapered profiles (21) is gradually reduced from a part close to the cylindrical profile (22) to two ends, second nut teeth (24) which are uniformly distributed are arranged on the surface of the cylindrical profile (22), and first nut teeth (23) which are uniformly distributed are arranged on the surface of the tapered profiles (21); gyro wheel (2) are still including setting up in main shaft (7) at gyro wheel (2) center, and the length of main shaft (7) is greater than the length of gyro wheel (2), and the both ends of main shaft (7) are passed through fixed knot and are constructed (3) and be connected with centralizer body (1), and the both sides of gyro wheel (2) are provided with the bearing group of cover establishing on main shaft (7), and the bearing group outwards is second bearing (10), first bearing (9) and buffer component (8) in proper order from gyro wheel (2), and centralizer body (1) still is provided with eye (5) of lining up centralizer body (1).

2. Centralizer with wellbore conditioning function according to claim 1, characterized in that the fixing structure (3) is a fixing bolt or a wedge structure.

3. Centralizer with wellbore conditioning function according to claim 2, characterized by further comprising a breathing hole (32), said breathing hole (32) being provided through the fixed structure (3).

4. Centralizer with wellbore conditioning function according to claim 1, characterized in that said first (9) and second (10) bearings are wear resistant cemented carbide type bearings.

5. Centralizer with wellbore conditioning function according to claim 4, characterized in that said first (9) and second (10) bearings are polycrystalline diamond bearings.

6. The centralizer with wellbore conditioning function according to claim 1, wherein the roller (2) is shaped as one of an ellipsoid, a stepped cylinder and a cone.

7. Centralizer with wellbore conditioning function according to claim 1, characterized in that the damping member (8) is one of a belleville spring, a rubber elastomer, a set of parallel springs.

8. Centralizer with wellbore conditioning function according to claim 1, characterised in that the number of grooves (4) and rollers (2) includes, but is not limited to, three.

9. Centralizer with wellbore conditioning function according to claim 1, characterised by the fact that the only roller (2) protruding from the profile of the centralizer body (1).

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