CN205135449U - A rotary oil pipe conversion joint - Google Patents

Abstract

The utility model discloses a rotatory oil pipe crossover sub, the surface middle part of center tube is protruding to become the step shaft protruding, rotatory pressure-bearing subassembly and urceolus are all overlapped outside the center tube, wherein, the lower terminal surface top of rotatory pressure-bearing subassembly is at the up end of step shaft protruding, the surface of rotatory pressure-bearing subassembly and the upper end screw thread of urceolus are fixed, the lower extreme of top connection and the upper end outer surface screw thread of center tube are fixed, every first sealing washer seals at the hookup location of center tube and top connection, the lower extreme of urceolus and the upper end outer surface screw thread of bottom connection are fixed, second sealing washer and spacer ring all overlap on the center tube, the cooperation of second sealing washer and spacer ring is pushed up between the up end of bottom connection and the lower terminal surface of step shaft protruding, first roller group evenly installs a plurality of first roller inslot that open on the bottom connection; the technical problem that the rotary joint in the prior art is prone to eccentric wear of the framework sealing ring during working is effectively solved, the service life of the tool is prolonged, and therefore construction quality is guaranteed.

Description

A rotary oil pipe conversion joint

technical field

The utility model relates to the technical field of oil and gas field development, in particular to a rotary oil pipe conversion joint.

Background technique

The rotary tubing conversion joint is a device commonly used in downhole operations to allow bottomhole tools to rotate freely. The load that the rotary tubing conversion joint can bear and the sealing effect of the sealing ring play an important role in the quality of the entire downhole operation.

The existing rotary joint is composed of a hollow rotating shaft, a shaft sleeve, a connecting head, a bearing, a skeleton sealing ring, an annular groove, and a sealing protruding ring, and the rotating seal is realized by relying on the skeleton sealing ring and the hollow rotating shaft during operation. This kind of rotary joint bearing is arranged on one side of the sealing ring, which will lead to poor stability of the rotary joint, and then it is easy to produce eccentric wear on the skeleton sealing ring when the rotary joint is working, which eventually leads to seal failure.

Utility model content

The embodiment of the utility model solves the technical problem that the rotary joint in the prior art tends to cause eccentric wear to the skeleton sealing ring by providing a rotary oil pipe conversion joint.

A rotary oil pipe conversion joint provided by an embodiment of the utility model includes: an upper joint, a central pipe, a rotating pressure bearing assembly, an outer cylinder, at least one first sealing ring, a second sealing ring, a spacer ring, a lower joint, a first roller set;

The middle part of the outer surface of the central pipe protrudes into a stepped shaft, and the rotating pressure-bearing assembly and the outer cylinder are both sleeved on the outside of the central pipe, wherein the lower end surface of the rotating pressure-bearing assembly rests on the The upper end surface of the stepped shaft protrusion, the outer surface of the rotating pressure-bearing assembly is screwed to the upper end of the outer cylinder, the lower end of the upper joint is screwed to the upper outer surface of the central pipe, and each of the first The sealing ring is sealed at the connection position between the central tube and the upper joint, the lower end of the outer cylinder is screwed to the outer surface of the upper end of the lower joint, and the second sealing ring and the spacer ring are both sleeved on the upper end of the lower joint. On the central tube, the second seal ring and the spacer ring fit between the upper end surface of the lower joint and the lower end surface of the stepped shaft protrusion, and the first roller group is evenly installed on the In the multiple first roller grooves opened on the lower joint;

The lower end of the lower joint is connected to a downhole tool, and the lower joint transmits torque to the outer cylinder, and the outer cylinder transmits torque to the rotating pressure-bearing assembly, so that driven by the downhole tool, the The lower joint, the outer cylinder and the rotating pressure-bearing assembly rotate together, while the central pipe, the upper joint and the oil pipe connected to the lower end of the upper joint are all stationary.

Preferably, the rotating pressure-bearing assembly includes: a thrust bearing seat, a thrust bearing and a second roller set;

Both the thrust bearing seat and the thrust bearing are sleeved on the outer surface of the central tube, and the outer surface of the thrust bearing seat is fixed on the inner surface of the upper end of the outer cylinder by threads, wherein one side of the thrust bearing The upper end surface of the stepped shaft is pushed against, the lower end surface of the thrust bearing seat is pressed against the other side of the thrust bearing, and the inner surface of the upper end of the thrust bearing seat is annularly evenly distributed with a plurality of axial second Roller grooves, each of the second roller grooves is equipped with a roller of the second roller set.

Preferably, the lower end surface of the spacer ring is against the upper end surface of the lower joint, the lower end surface of the second sealing ring is against the upper end surface of the spacer ring, and the upper end surface of the second sealing ring is against the upper end surface of the lower joint. The lower end surface of the stepped shaft is convex.

Preferably, the outer surface of the lower end of the lower joint is provided with external threads to be threadedly connected with the downhole tool.

Preferably, the inner surface of the upper end of the upper joint is provided with an internal thread to be threadedly connected with the oil pipe.

Preferably, at least one sealing groove is formed on the outer surface of the upper end of the central pipe around the pipe wall, and one of the first sealing rings is installed in each sealing groove.

Preferably, the thrust bearing and the outer surface of the central tube are clearance fit.

Preferably, there is clearance fit between the spacer ring and the outer surface of the central tube.

Preferably, the second sealing ring is a Y-shaped sealing ring.

Preferably, the first sealing ring is an O-ring.

One or more technical solutions provided in the embodiments of the utility model have at least the following technical effects or advantages:

The rotary oil pipe conversion joint provided by the embodiment of the utility model adopts the second rotating pressure-bearing component to convert the sliding friction force between the central tube and the thrust bearing seat into rolling friction force, and adopts the first roller group to convert the central tube and the thrust bearing seat into rolling friction force. The sliding friction between the lower joints is transformed into rolling friction, thereby greatly reducing the wear between parts and avoiding seal failure, thus effectively solving the problem of eccentric wear of the skeleton sealing ring in the prior art when the rotary joint is working Problems, increase the life of the tool, thereby ensuring the quality of construction.

Furthermore, in the rotary oil pipe conversion joint provided by the embodiment of the utility model, the thrust bearing is placed between the upper end surface of the stepped shaft protrusion of the center pipe and the lower end surface of the thrust bearing seat, so that the rotary oil pipe conversion joint can bear a relatively large load pressure, greatly The axial pressure bearing capacity of the rotary oil pipe conversion joint is enhanced, and it can still rotate freely in the axial direction under the condition of axial pressure bearing, so that the rotary oil pipe conversion joint provided by the utility model realizes the installation of heavy tools to The effect of working under pressure.

Furthermore, the rotary oil pipe conversion joint provided by the embodiment of the utility model adopts the Y-shaped sealing ring with automatic compensation function, and the edge wear of the Y-shaped sealing ring has no effect on the sealing effect, and the greater the fluid pressure in the center pipe, the better the sealing effect , thus achieving a better sealing effect for the rotary oil pipe conversion joint.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description It is only an embodiment of the utility model, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a structural schematic diagram of a transfer oil pipe conversion joint according to an embodiment of the present invention;

Fig. 2 is a cross-sectional view along A-A of Fig. 1 .

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Referring to Figure 1, a rotary oil pipe conversion joint provided by the present invention includes: an upper joint 1, a central pipe 2, a rotating pressure-bearing assembly, an outer cylinder 3, at least one first sealing ring 4, and a second sealing ring 5 , spacer ring 6, lower joint 7, the first roller set.

The middle part of the outer surface of the central pipe 2 protrudes into a stepped shaft protrusion 2-1, and the rotating pressure-bearing assembly and the outer cylinder 3 are both sleeved outside the central pipe 2, wherein the lower end surface of the rotating pressure-bearing assembly is pushed against the stepped shaft protrusion 2-1 The upper end surface of the upper end of the rotating pressure-bearing assembly is threaded to the upper end of the outer cylinder 3, the lower end of the upper joint 1 is threaded to the upper outer surface of the central tube 2, and each first sealing ring 4 is sealed between the central tube 2 and the upper end. The connection position of the joint 1, the lower end of the outer cylinder 3 and the outer surface of the upper end of the lower joint 7 are threaded and fixed, the second sealing ring 5 and the spacer ring 6 are both sleeved on the central tube 2, and the second sealing ring 5 and the spacer ring 6 cooperate to top Between the upper end surface of the lower joint 7 and the lower end surface of the stepped shaft protrusion 2-1, the inner surface of the lower joint 7 is annularly evenly opened with a plurality of axial first roller grooves 7-1, namely: a plurality of first roller grooves 7-1 The roller grooves 7 - 1 are annularly distributed on the inner surface of the lower joint 7 , and each first roller groove 7 - 1 is along the axial direction of the lower joint 7 . A roller 8 of the first roller group is installed in each first roller groove 7-1; the lower end of the lower joint 7 is connected to the downhole tool, and the lower joint 7 transmits the torque to the outer cylinder 3, and the outer cylinder 3 transmits the torque Give the rotating pressure-bearing assembly such that driven by the downhole tool, the lower joint 7 and the outer cylinder 3 rotate together with the rotating pressure-bearing assembly, while the central pipe 2, the upper joint 1 and the tubing connected to the upper end of the upper joint 1 are all stationary .

In a specific embodiment, six first roller grooves 7-1 are evenly opened on the lower joint 7, and the first roller set has six rollers 8, and each first roller groove 7-1 houses a roller. Column 8. Of course, in the specific implementation process, there may also be four or eight first roller grooves 7-1 or the like, and each first roller groove 7-1 is equipped with one of the first roller groups. Roller 8.

As shown in FIG. 2 , in a specific implementation process, the rotating pressure bearing assembly includes: a thrust bearing housing 9 , a thrust bearing 10 and a second roller set. The thrust bearing seat 9 and the thrust bearing 10 are both sleeved on the outer surface of the central tube 2, and the outer surface of the thrust bearing seat 10 is threadedly fixed on the inner surface of the upper end of the outer cylinder 3, wherein one side of the thrust bearing stands on the stepped shaft protrusion 2-1 The upper end surface of the thrust bearing seat 9 is on the other side of the thrust bearing 10, and the inner surface of the upper end of the thrust bearing seat 9 is annularly evenly distributed with a plurality of axial second roller grooves 9-1. A roller 11 of the second roller group is housed in the two roller grooves 9-1, and the roller 11 rolls in the second roller groove 9-1, and each roller 11 is along the circumference of the outer surface of the central tube 2. to free scrolling. Specifically, there is clearance fit between the thrust bearing 10 and the outer surface of the central tube 2 .

In a specific embodiment, six second roller grooves 9-1 are evenly opened on the thrust bearing seat 9, and the second roller set has six rollers 11, and each second roller groove 9-1 contains There is a roller 11. Of course, in the specific implementation process, four or eight second roller grooves 9-1 can also be evenly opened, etc., and a roller 11 is installed in each second roller groove 9-1.

In the rotary pressure-bearing assembly in the above technical solution, the setting of the thrust ball bearing 10 enables the rotary oil pipe conversion joint provided by the embodiment of the present utility model to withstand relatively large axial pressure, and the gap between the thrust bearing 10 and the outer surface of the center pipe 2 For clearance fit, the sliding friction between the thrust bearing 10 and the central tube 2 is avoided, and the sliding friction is converted into rolling friction by the roller 11, thus greatly reducing the wear between the parts at one end and increasing the friction provided by the utility model. The service life of the rotary oil pipe conversion joint greatly improves the success rate of construction operations.

Specifically, the lower end surface of the spacer ring 6 is pressed against the upper end surface of the lower joint 7, the lower end surface of the second sealing ring 5 is pressed against the upper end surface of the spacer ring 6, and the upper end surface of the second sealing ring 5 is pressed against the stepped shaft protrusion 2-1 the lower end face. Preferably, the second sealing ring 5 is a Y-shaped sealing ring. Using the Y-shaped sealing ring enables the rotary oil pipe conversion joint provided by the utility model to still achieve rotary dynamic sealing when rotating, and the edge wear of the Y-shaped sealing ring 5 has a great impact on the sealing effect. No impact, but with automatic compensation function, so the Y-shaped sealing ring 5 realizes the technical effect that the greater the fluid pressure in the central tube 2, the better the sealing effect. In the specific implementation process, the spacer ring 6 and the outer surface of the center tube 2 are clearance fit, thus avoiding the friction between the center tube 2 and the spacer ring 6, and the roller 8 converts sliding friction into rolling friction, Therefore, the wear between the parts on the other end is greatly reduced.

Specifically, the outer surface of the lower end of the lower joint 7 is provided with external threads for threaded connection with downhole tools. Specifically, the inner surface of the upper end of the upper joint 1 is provided with an internal thread for threaded connection with the oil pipe.

Specifically, at least one sealing groove is formed on the outer surface of the upper end of the central pipe 2 around the pipe wall of the central pipe 2, and a first sealing ring 4 is installed in each sealing groove. For example, for example, the outer surface of the upper end of the central tube 2 is circumferentially provided with two sealing grooves, and a first sealing ring 4 is installed in each sealing groove. Specifically, the first sealing ring 4 may use, but is not limited to, an O-ring.

Through one or more technical solutions provided in the above-mentioned embodiments of the present invention, at least the following technical effects or advantages are obtained:

The rotary oil pipe conversion joint provided by the embodiment of the utility model adopts the second rotating pressure-bearing component to convert the sliding friction force between the central tube and the thrust bearing seat into rolling friction force, and adopts the first roller group to convert the central tube and the thrust bearing seat into rolling friction force. The sliding friction between the lower joints is transformed into rolling friction, thereby greatly reducing the wear between parts and avoiding seal failure, thus effectively solving the problem of eccentric wear of the skeleton sealing ring in the prior art when the rotary joint is working Problems, increase the life of the tool, thereby ensuring the quality of construction.

Furthermore, in the rotary oil pipe conversion joint provided by the embodiment of the utility model, the thrust bearing is placed between the upper end surface of the stepped shaft protrusion of the center pipe and the lower end surface of the thrust bearing seat, so that the rotary oil pipe conversion joint can bear a relatively large load pressure, greatly The axial pressure bearing capacity of the rotary oil pipe conversion joint is enhanced, and it can still rotate freely in the axial direction under the condition of axial pressure bearing, so that the rotary oil pipe conversion joint provided by the utility model realizes the installation of heavy tools to The effect of working under pressure.

Furthermore, the rotary oil pipe conversion joint provided by the embodiment of the utility model adopts the Y-shaped sealing ring with automatic compensation function, and the edge wear of the Y-shaped sealing ring has no effect on the sealing effect, and the greater the fluid pressure in the center pipe, the better the sealing effect , thus achieving a better sealing effect for the rotary oil pipe conversion joint.

While preferred embodiments of the present invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, the appended claims are intended to be interpreted to cover the preferred embodiment and all changes and modifications which fall within the scope of the present invention.

Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

Claims (10)

1. A rotary oil pipe conversion joint, characterized in that it includes: an upper joint, a central pipe, a rotating pressure-bearing assembly, an outer cylinder, at least one first sealing ring, a second sealing ring, a spacer ring, a lower joint, a first roller column group; The middle part of the outer surface of the central pipe protrudes into a stepped shaft, and the rotating pressure-bearing assembly and the outer cylinder are both sleeved on the outside of the central pipe, wherein the lower end surface of the rotating pressure-bearing assembly rests on the The upper end surface of the stepped shaft protrusion, the outer surface of the rotating pressure-bearing assembly is screwed to the upper end of the outer cylinder, the lower end of the upper joint is screwed to the upper outer surface of the central pipe, and each of the first The sealing ring is sealed at the connection position between the central tube and the upper joint, the lower end of the outer cylinder is screwed to the outer surface of the upper end of the lower joint, and the second sealing ring and the spacer ring are both sleeved on the upper end of the lower joint. On the central tube, the second seal ring and the spacer ring fit between the upper end surface of the lower joint and the lower end surface of the stepped shaft protrusion, and the first roller group is evenly installed on the In the multiple first roller grooves opened on the lower joint; The lower end of the lower joint is connected to a downhole tool, and the lower joint transmits torque to the outer cylinder, and the outer cylinder transmits torque to the rotating pressure-bearing assembly, so that driven by the downhole tool, the The lower joint, the outer cylinder and the rotating pressure-bearing assembly rotate together, while the central pipe, the upper joint and the oil pipe connected to the lower end of the upper joint are all stationary. 2. The rotary oil pipe conversion joint according to claim 1, wherein the rotary pressure bearing assembly comprises: a thrust bearing seat, a thrust bearing and a second roller set; Both the thrust bearing seat and the thrust bearing are sleeved on the outer surface of the central tube, and the outer surface of the thrust bearing seat is fixed on the inner surface of the upper end of the outer cylinder by threads, wherein one side of the thrust bearing The upper end surface of the stepped shaft is pushed against, the lower end surface of the thrust bearing seat is pressed against the other side of the thrust bearing, and the inner surface of the upper end of the thrust bearing seat is annularly evenly distributed with a plurality of axial second Roller grooves, each of the second roller grooves is equipped with a roller of the second roller set. 3. The rotary oil pipe conversion joint according to claim 2, wherein the lower end surface of the spacer ring is against the upper end surface of the lower joint, and the lower end surface of the second sealing ring is against the spacer ring The upper end surface of the second seal ring abuts against the lower end surface of the stepped shaft protrusion. 4. The rotary tubing conversion joint according to claim 3, characterized in that, the outer surface of the lower end of the lower joint is threadedly connected with the downhole tool. 5. The rotary oil pipe conversion joint according to claim 3, characterized in that, the inner surface of the upper end of the upper joint is provided with an internal thread to be threadedly connected with the oil pipe. 6. The rotary oil pipe conversion joint according to claim 3, wherein at least one sealing groove is formed on the outer surface of the upper end of the central pipe around the pipe wall, and one of the first sealing grooves is installed in each sealing groove. lock up. 7. The rotary oil pipe conversion joint according to claim 3, wherein the thrust bearing and the outer surface of the center pipe are clearance fit. 8 . The rotary oil pipe conversion joint according to claim 3 , wherein the gap fit is between the spacer ring and the outer surface of the center pipe. 9 . 9. The rotary oil pipe conversion joint according to claim 3, wherein the second sealing ring is a Y-shaped sealing ring. 10. The rotary oil pipe conversion joint according to claim 3, wherein the first sealing ring is an O-ring sealing ring.