CN209179704U - A self-positioning screw drill centralizer - Google Patents

Abstract

The utility model discloses a self-positioning screw drill centralizer, which comprises a universal shaft, the tail end of the universal shaft is connected with a transmission shaft, the outer ring of the transmission shaft is provided with a housing, and the front end of the housing is provided with a A limit cap, a limit groove is arranged on the housing at the lower end of the limit cap, and a rack centralizer is embedded in the limit groove, and a positioning groove is arranged at the tail end of the housing, which is located at the The housing at the rear end of the positioning groove is screwed with a positioning ring; the front end of the rack centralizer is provided with a limit block, and the limit block is embedded in the limit groove, and the tail end of the rack centralizer It extends backward and is provided with a positioning block. The positioning block is embedded in the positioning groove and fixed by the positioning ring; the front end of the rack centralizer engages with the shell surface of the transmission shaft, and the tail end of the rack centralizer passes through the The positioning ring is locked, and the position of the rack centralizer can be adjusted according to the bending point line of the cardan shaft, so as to realize the directional deflection of the screw drilling tool.

Description

A self-positioning screw drill centralizer

technical field

The utility model relates to the field of oil exploration equipment, in particular to a self-positioning screw drill centralizer.

Background technique

The screw drilling tool is a downhole dynamic drilling tool widely used in petroleum drilling, mainly including a bypass valve assembly, a motor assembly, a cardan shaft assembly and a transmission shaft assembly, and is fixedly connected from top to bottom. Cardan shafts mainly include petal-type cardan shafts, flexure-type cardan shafts and ball-jointed cardan shafts, among which ball-joint cardan shafts have a longer service life than petal-type cardan shafts and lower costs than flexure-type cardan shafts. And be widely used. Screw drilling centralizers include conventional centralizers and replaceable centralizers. In order to meet the requirements of drilling, replaceable centralizers can be equipped. Customers can replace suitable centralizers at the well site at any time according to the situation. However, the conventional screw drill Tool centralizers have the following deficiencies:

For example, the application number is 201520416417.6, and the patent name is a utility model patent for a screw drilling tool centralizer: a centralizer is set on the outside of the screw body, and the centralizer includes a first centralizer, a second centralizer and a third centralizer connected in sequence device. Although this screw drill centralizer can reduce the sliding ratio, each part of the existing centralizer must correspond one by one, which is not only unfavorable for installation and disassembly, but also inconvenient for mass production.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings of the existing technical solutions, the utility model provides a self-positioning screw drill centralizer, the front end of the rack centralizer engages with the shell surface of the drive shaft, and the tail end of the rack centralizer is locked by a positioning ring , the position of the rack centralizer can be adjusted according to the bending point line of the cardan shaft to realize directional deflection of the screw drilling tool, which can effectively solve the problems raised by the background technology.

The technical scheme that the utility model solves its technical problem adopts is:

A self-positioning screw drill centralizer, comprising a cardan shaft, the tail end of the cardan shaft is connected with a transmission shaft, the outer ring of the transmission shaft is provided with a housing, and the front end of the housing is provided with a limit cap, which is located at The housing at the lower end of the limiting cap is provided with a limiting groove, and a rack centralizer is embedded in the limiting groove, and a positioning groove is arranged at the tail end of the housing, and a positioning groove located at the rear end of the positioning groove A positioning ring is screwed on the housing;

The front end of the rack centralizer is provided with a limit block, and the limit block is embedded in the limit groove. The rear end of the rack centralizer extends backward and is provided with a positioning block. The positioning block It is embedded in the positioning groove and fixed by the positioning ring.

Further, a shock absorber is arranged between the rack centralizer and the housing, the shock absorber is sleeved on the housing, the shock absorber includes an inner cylinder and an outer cylinder, and the two inner cylinders The end is bent toward the center to be provided with a hook cavity, and the two ends of the outer cylinder are provided with steps, and the steps are engaged in the hook cavity, and a plurality of fixing grooves are arranged on the inner side wall of the outer cylinder, and the fixing grooves A buffer spring is installed inside.

Further, the limiting cap and the housing are of an integrated structure, the rack centralizer, the limiting block and the positioning block are of an integrated structure, and several limiting grooves are arranged around the perimeter of the housing, And the length of the limiting groove is twice the length of the upper limiting block of the rack centralizer.

Further, the length direction of the rack centralizer is consistent with the length direction of the transmission shaft, and an anti-loosening washer is arranged between the positioning ring and the rack centralizer.

Compared with the prior art, the beneficial effects of the present utility model are:

(1) The housing of the utility model is set on the transmission shaft, the housing of the cardan shaft and the housing of the transmission shaft are tightened, and the rack centralizer is adjusted to a proper position according to the bending point line of the cardan shaft, and the gear The front end of the rack centralizer is inserted into the limit groove provided on the shell, the tail end of the rack centralizer is engaged in the positioning groove, and the positioning ring is tightened to fix the rack centralizer on the outer end surface of the shell. This centralizer is not only simple in structure, suitable for mass production, but also easy to operate and disassemble, which effectively solves the problem of one-to-one alignment between the centralizer and the cardan shaft housing in the prior art;

(2) A shock-absorbing cylinder is arranged between the housing and the centralizer of the utility model, and the shock-absorbing cylinder is set on the housing, and the buffer spring in the shock-absorbing cylinder can effectively reduce the acting force on the housing and act on the transmission shaft. Arrived a very good protective effect.

Description of drawings

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is the schematic diagram of the sectional structure of the housing of the utility model;

Fig. 3 is a structural schematic diagram of the shock absorbing cylinder of the present invention.

Labels in the figure:

1-cardan shaft; 2-housing; 3-rack centralizer; 4-positioning ring; 5-drive shaft; 6-limiting cap; 7-limiting groove; 8-positioning groove; 9-limiting block; 10-positioning block; 11-shock absorbing cylinder;

111-inner cylinder; 112-outer cylinder; 113-back hook chamber; 114-step; 115-fixing groove; 116-buffer spring.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

As shown in Figures 1 to 3, the utility model provides a self-positioning screw drilling tool centralizer, including a universal shaft 1, the front end of the universal shaft 1 is connected to the rotor of the motor, and the tail end of the universal shaft 1 is connected to the transmission The water cap of the shaft 5 connects the rotor of the motor with the transmission shaft 5, and transmits the output torque and rotating speed of the motor to the drill bit through the transmission shaft 5.

In this embodiment, the outer ring of the transmission shaft 5 is provided with a casing 2, the casing of the cardan shaft 1 is screwed and connected with the casing 2 of the transmission shaft 5, and a rack centralizer 3 is provided outside the casing 2. The front end of the housing 2 is provided with a limiting cap 6, the housing 2 at the lower end of the limiting cap 6 is provided with a limiting groove 7, the front end of the rack centralizer 3 is provided with a limiting block 9, and the limiting block 9 is embedded in the limiting The length of the limit groove 7 is twice the length of the upper limit block 9 of the rack centralizer 3; a positioning groove 8 is arranged at the tail end of the housing 2, and the tooth The tail end of the bar centralizer 3 extends backward, and is provided with a positioning block 10, the positioning block 10 is embedded in the positioning groove 8, and the housing 2 located at the rear end of the positioning groove 8 is screwed with a positioning ring 4, through which the positioning ring 4 The rack centralizer 3 is fixed on the end face of the housing 2. Since the rack centralizer 3 is mounted on the end face of the housing 2 in an engaging manner, the rack centralizer 3 is easy to operate and disassemble, has strong practicability and a simple structure, and is suitable for Mass production, cost saving.

It is further explained that the limit cap 6 and the housing 2 are of an integrated structure, which improves the stability of the overall structure. Adjust the rack centralizer 3 to an appropriate position to realize the directional deflection of the screw drilling tool, effectively solving the problem that the centralizer of the screw drilling tool in the prior art needs to be aligned with the cardan shaft housing one by one, and improving work efficiency.

It should be added that the rack centralizer 3, the limit block 9 and the positioning block 10 are of an integrated structure, the length direction of the rack centralizer 3 is consistent with the length direction of the transmission shaft 5, and the rack centralizer 3 is four-sided All of them are truss-shaped structures with inclined planes, which enhance the firmness of the rack centralizer 3, prolong the service life of the rack centralizer 3, and save costs. An anti-loosening gasket is arranged between the positioning ring 4 and the rack centralizer 3, Moreover, the tightening direction of the positioning ring 4 is consistent with the rotation direction of the transmission shaft 5, so that the installation of the rack centralizer 3 is more stable and avoids falling off during use.

In this embodiment, a shock absorber 11 is arranged between the rack centralizer 3 and the housing 2, and the shock absorber 11 is set on the housing 2. The shock absorber 11 includes an inner cylinder 111 and an outer cylinder 112. The two ends of the cylinder 111 are bent toward the center to be provided with a hook chamber 113, and the two ends of the outer cylinder 112 are provided with steps 114, and the steps 114 are engaged in the hook chamber 113, and the inner wall of the outer cylinder 112 is provided with several fixing grooves 115 , the buffer spring 116 is installed in the fixed groove 115, when drilling, the rack centralizer 3 is forced to squeeze the outer cylinder 112, and the buffer spring 116 arranged between the outer cylinder 112 and the inner cylinder 111 can effectively reduce the rack centralizer. The force that the device 3 acts on the housing 2 plays a very good role in protecting the transmission shaft 5, prolonging the service life of the screw drilling tool and improving work efficiency.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments are to be considered in all respects as exemplary and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is therefore intended that the All changes within the meaning and range of the required equivalents are embraced within the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (4)

1. the tail end of a kind of self-positioning centralizer for screwdrill, including universal shaft (1), the universal shaft (1) is connected with transmission shaft (5), it is characterised in that: transmission shaft (5) outer ring is provided with shell (2), and shell (2) front end is provided with limited cap (6), It is provided with limiting groove (7) on the shell (2) of the limited cap (6) lower end, rack gear is embedded in the limiting groove (7) The tail end of centralizer (3), the shell (2) is provided with locating slot (8), is located on the shell (2) of the locating slot (8) rear end and revolves Conjunction has positioning ring (4)；

The front end of the rack gear centralizer (3) is provided with limited block (9), and the limited block (9) is inlaid in limiting groove (7), The tail end of the rack gear centralizer (3) extends back, and is provided with locating piece (10), and the locating piece (10) is inlaid in locating slot (8) in, and it is fixed by positioning ring (4).

2. a kind of self-positioning centralizer for screwdrill according to claim 1, it is characterised in that: be located at the rack gear righting It is provided between device (3) and shell (2) damper cylinder (11), the damper cylinder (11) is sleeved on shell (2), the damper cylinder It (11) include inner cylinder (111) and outer cylinder (112), the both ends of the inner cylinder (111) are provided with back hook chamber (113) to center curvature, The both ends of the outer cylinder (112) are provided with step (114), and the step (114) is fastened in back hook chamber (113), the outer cylinder (112) it is provided on inner sidewall several fixing grooves (115), buffer spring (116) is installed in the fixing groove (115).

3. a kind of self-positioning centralizer for screwdrill according to claim 1, it is characterised in that: the limited cap (6) and Shell (2) is an integral structure, and the rack gear centralizer (3), limited block (9) and locating piece (10) are an integral structure, institute It states limiting groove (7) and shell (2) perimeter is provided with several, and the length of the limiting groove (7) is that the rack gear is helped Twice of positive device (3) upper limit position block (9) length.

4. a kind of self-positioning centralizer for screwdrill according to claim 1, it is characterised in that: the rack gear centralizer (3) length direction is consistent with the length direction of transmission shaft (5), is provided between the positioning ring (4) and rack gear centralizer (3) Check washer.