CN213016223U - Self-adaptive friction-reducing resistance centralizer - Google Patents

Abstract

The utility model provides a self-adaptation friction-reducing resistance centralizer, includes annular outer retaining ring of circle and the annular interior fender ring of circle, and the equidistant muscle of rightting that is provided with in the outer retaining ring outside, it has the recess to open on the outer retaining ring, and it has circular through-hole to open on the interior fender ring, recess and circular through-hole correspond the setting each other, be provided with spherical roller on the recess, radial displacement of fender ring including circular through-hole is used for the restriction spherical roller, spherical roller and drilling rod direct contact. The utility model discloses can realize rightting and falling the effect of rubbing simultaneously to the drilling rod body.

Description

Self-adaptive friction-reducing resistance centralizer

Technical Field

The utility model relates to an oil field well drilling tool technical field, in particular to self-adaptation friction-reducing resistance centralizer.

Background

At present, in the drilling process of a large displacement well and a horizontal well, friction torque generated by friction between a drill rod and a well wall or a casing is a key problem for limiting the drilling technology to advance to a deep well and an ultra-deep well. In addition, the stability of the bottom hole assembly and the drill rods nearby the bottom hole assembly is maintained on the premise of ensuring the structural standard of the well bore, the deviated well bore can enable the drilling tool to be subjected to larger lateral force, and the lateral force can influence the well bore structure in a reverse mode while aggravating the abrasion of the drilling tool to form vicious circle. The long-time friction between the drilling tool and the well wall or the casing can wear through the casing, and in severe cases, the drilling tool can be stuck, and even the whole well is scrapped.

The installation of the friction reducing tool is the most commonly adopted friction reducing means on the drilling site at the present stage, but the foreign drilling tool with better friction reducing effect is expensive, and the cost of the drilling tool is difficult to support for the well site with common benefit. In China, two methods are mainly adopted for friction reduction and drag reduction, one is to spray special materials on a drilling tool, but the method has severe damage to a coating due to severe underground environment, and the good friction reduction effect is difficult to ensure. Secondly, design friction reduction drag reduction nipple joint, this type of instrument structure is complicated, and most only possesses the friction reduction effect of one direction, though can play certain friction reduction effect, but the effect is not good enough and the life-span is on a short side. Generally, fewer underground tools capable of meeting the requirements of centralization and friction reduction are provided, but centralization and friction reduction are key problems for improving the extending drilling capability of horizontal wells and directional wells.

Disclosure of Invention

In order to overcome the not enough of above-mentioned prior art, the utility model aims to provide a self-adaptation falls rubs and hinders centralizer can realize rightting and fall the effect of rubbing simultaneously to the drilling rod body.

In order to realize the purpose, the utility model discloses a technical scheme is:

the utility model provides a self-adaptation friction-reducing resistance centralizer, includes that 3 outer retainer rings of annular are 3 and the annular interior fender ring 5 of annular, and 3 outside equidistant righting muscle 2 that are provided with of outer retainer ring, it has the recess to open on the outer retainer ring 3, and it has circular through-hole to open on the interior fender ring 5, recess and circular through-hole correspond the setting each other, be provided with spherical roller 4 on the recess, circular through-hole is used for restricting the radial displacement of fender ring 5 including spherical roller 4, spherical roller 4 and drilling rod direct contact.

The outer retainer rings 3 are two half outer retainer rings, and the splicing positions of the half outer retainer rings are provided with inner hexagonal cylindrical head screws, positioning pins, positioning pin holes and stepped threaded holes.

4 hemispherical recesses that the diameter is 25mm are evenly distributed to 3 epaxial equipartitions of outer retaining ring to the axis is the benchmark, and each equipartition 5 hemispherical recesses of 60 degrees of skew from top to bottom, diameter are 25 mm.

The righting rib 2 on the outer side of the outer retainer ring 3 is a streamline righting rib.

The inner surface of the outer retainer ring 3 is coated with a wear-resistant layer by using a ceramic material, and the groove is hemispherical.

The inner baffle ring 5 is of two semicircular ring structures, and the end part of the inner baffle ring 5 is provided with an end cover 1 for fixing.

The circle center of the circular through hole arranged on the inner baffle ring 5 is uniformly distributed with 4 circular holes at the center position on the outer cylindrical bus of the inner baffle ring 5, and the circular through holes are uniformly distributed with 5 circular through holes by offsetting 60 degrees up and down by taking the circle center connecting line of the central circular hole as a reference.

The diameter of the spherical roller 4 is 24 mm.

The utility model has the advantages that:

the utility model discloses install on the drilling rod body, along with the motion of drilling rod and move, play and right the drilling rod, improve the effect of drilling string stability.

When the drill rod cannot move due to the fact that the friction force is too large due to stratum factors, the tool is directly contacted with a well wall due to the fact that the diameter of the tool is larger than that of the drill rod body, accordingly, the axial movement of the drill rod and the freedom degree of axial rotation are released, sliding friction between the drill rod body and a stratum or a sleeve is converted into rolling friction, and the effect of reducing friction resistance is achieved.

The inner surface of the complete retainer ring is provided with hemispherical grooves which are distributed in an even-odd staggered manner (5-4-5 ), so that the fatigue damage to the drill rod caused by stress concentration is avoided.

The circular hole of the inner retainer ring is coaxial with the spherical groove of the outer retainer ring, and the function of limiting the spherical roller is achieved.

The streamlined righting rib has the minimum blocking effect on the drilling fluid, and the drilling fluid is convenient to carry rock debris to be discharged.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the half outer retainer ring of the present invention.

Fig. 3a is a front view of the half outer retainer ring of the present invention.

Fig. 3b is a cross-sectional view of the half outer retainer ring of the present invention.

Fig. 4 is a schematic structural view of the half inner baffle ring of the present invention.

Fig. 5a is a front view of the half inner retainer ring of the present invention.

Fig. 5b is a cross-sectional view of the inner retainer ring of the present invention.

Fig. 6 is a schematic view of the end cap structure of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1-6: the device consists of an end cover 1, an outer retainer ring 3, an inner retainer ring 5 and a spherical roller 4. The outer retainer ring 3 is provided with a centering rib 2, the maximum diameter of the centering rib is consistent with the diameter of a well hole, and the function of centering the drill rod is achieved. The drill rod body moves in an annular area formed by the rollers 4 and the inner baffle ring 5, the drill rod is directly contacted with the rollers 4, sliding friction between the drill rod and a well wall or a sleeve is converted into rolling friction, and frictional resistance is greatly reduced.

The centralizer has the total length of 1020mm and the maximum outer diameter of 215.9mm, and the outer diameter of the adaptable drill rod is 127 mm. The above dimensions represent only one dimension of the invention, but are not to be understood as a limitation of the scope of the invention.

The end cap 1 is provided with internal threads for connecting the two inner half retaining rings to form a complete inner retaining ring 5.

The outer retainer ring 3 is formed by connecting two half outer retainer rings by inner hexagonal cylindrical head screws, and a joint surface is provided with a positioning pin, a positioning pin hole and a stepped threaded hole. The outer surface is provided with a streamline righting rib. The inner surface is coated with a wear resistant layer of ceramic material and is provided with hemispherical recesses.

The hemispherical grooves arranged on the inner surface of the outer retainer ring 3 are distributed as follows: 4 hemispherical grooves with the diameter of 25mm are uniformly distributed on the axis of the half retaining ring, 5 hemispherical grooves are uniformly distributed by vertically offsetting 60 degrees by taking the axis as a reference, and the diameter of each hemispherical groove is 25 mm.

The inner baffle ring 5 is a complete inner baffle ring 5 formed by connecting two half inner baffle rings by end covers 1, and a joint surface is provided with a positioning pin and a positioning pin hole. The outer surface of the ceramic material is coated with wear-resistant ceramic material and is provided with circular through holes.

The centre of a circle of the circular through hole that the inner blocking ring 5 set up is on the outer cylindrical surface generating line of blocking ring, 4 circular ports of central position equipartition to 60 degrees each equipartition 5 circular through holes of skew about using the central circular hole centre of a circle line as the benchmark, for the radial displacement of blocking ring 5 including restriction roller 4. The roller 4 has a diameter of 24 mm.

The utility model discloses a theory of operation:

the outer retainer ring 3 is provided with a groove for placing the spherical roller 4, the spherical roller 4 is placed in the groove arranged on the inner surface of one half outer retainer ring, the outer surface of the inner retainer ring 5 provided with the circular through hole is tightly attached to the inner surface of the outer retainer ring 3, and the spherical roller 3 is limited in the hemispherical groove. And then the other half of the outer retainer ring, the rollers and the other half of the inner retainer ring are installed. And assembling and positioning the two installed half bodies on the drill rod body by using positioning pins, and connecting the two half outer check rings by using inner hexagonal cylindrical head screws. Then the end cover is connected to the inner retaining ring through threads, the drill rod body moves in an annular area formed by the spherical roller 4 and the retaining ring, sliding friction between the drill rod body and a well wall or a sleeve is converted into rolling friction, and the effect of reducing friction resistance is achieved. The outer surface of the outer retainer ring 3 is provided with the streamline type righting rib 2, so that the effects of righting the drill rod body and disturbing the drilling fluid are achieved, the flow speed of the drilling fluid at the position can be accelerated, rock debris accumulation is prevented, and the drilling efficiency and quality are improved.

Claims (8)

1. The utility model provides a self-adaptation friction-reducing resistance centralizer, its characterized in that, including annular outer retaining ring (3) of circle and annular interior fender ring (5), outer retaining ring (3) outside equidistant be provided with right muscle (2), it has the recess to open on outer retaining ring (3), and it has circular through-hole to open on interior fender ring (5), the recess corresponds the setting with circular through-hole each other, be provided with spherical roller (4) on the recess, radial displacement of fender ring (5) including circular through-hole is used for restricting spherical roller (4), spherical roller (4) and drilling rod direct contact.

2. The self-adaptive friction reducing centralizer according to claim 1, wherein the outer retainer rings (3) are two half outer retainer rings, and the splicing positions of the half outer retainer rings are provided with inner hexagonal cylindrical head screws, positioning pins, positioning pin holes and stepped threaded holes.

3. The self-adaptive friction-reducing resistance centralizer according to claim 1, wherein 4 hemispherical grooves with the diameter of 25mm are uniformly distributed on the axis of the outer retainer ring (3), 5 hemispherical grooves with the diameter of 25mm are uniformly distributed on the axis of the outer retainer ring, and the diameters of the hemispherical grooves are 25mm when the outer retainer ring is vertically deviated by 60 degrees.

4. An adaptive friction reducing centralizer according to claim 1, characterized in that the centralizing ribs (2) outside the outer retainer ring (3) are streamlined centralizing ribs.

5. An adaptive friction reducing centralizer according to claim 1, characterized in that the inner surface of the outer retainer (3) is coated with a ceramic material as a wear resistant layer, and the grooves are hemispherical.

6. An adaptive friction reducing centralizer according to claim 1, characterized in that the inner baffle ring (5) is two semicircular ring structures, and the end of the inner baffle ring (5) is provided with an end cover (1) for fixing.

7. The self-adaptive friction-reducing resistance centralizer according to claim 1, wherein the circle center of the circular through hole arranged on the inner baffle ring (5) is on the generatrix of the outer cylindrical surface of the inner baffle ring (5), 4 circular holes are uniformly distributed in the center position, and 5 circular through holes are uniformly distributed in the positions which are vertically deviated by 60 degrees by taking the connection line of the circle centers of the circular holes as a reference.

8. An adaptive friction reducing centralizer, according to claim 1, characterized in that said spherical rollers (4) have a diameter of 24 mm.

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