CN211397489U - High-strength buckle-changing quick drilling tool joint - Google Patents

Abstract

The utility model discloses a high strength becomes to detain quick drilling tool joint, including connecting the body, connect the body both ends and be public head, set up same special buttress thread simultaneously at both ends promptly, connect the axial terminal surface of the public head of body as main sealed circular bead terminal surface, main sealed circular bead terminal surface is sealed for the end column face, the outward flange of main sealed circular bead terminal surface is processed into the negative angle circular bead, connect the body at special buttress thread end position processing stress relief groove. And an auxiliary sealing shoulder is continuously machined at the tail end of the stress relief groove of the joint body. The utility model discloses have characteristics such as the design is detained to the change, the taper design becomes, negative angle circular bead structure, advantages such as the operation is fast, stress distribution is even, intensity is high, good reliability. The problems of uneven stress distribution, low connection strength, low operation speed and the like of the conventional drilling tool thread can be solved.

Description

High-strength buckle-changing quick drilling tool joint

Technical Field

The utility model belongs to the technical field of the new well drilling, later stage well cementation and the supporting instrument of workover treatment of hyposmosis oil reservoir technique and specifically relates to a high strength becomes detains quick drilling tool joint.

Background

Along with the rapid increase of complex wells such as deep wells, ultra-deep wells, extended reach wells, high-temperature and high-pressure gas wells and the gradual development of high-difficulty-to-use reserve oil reservoirs such as low permeability and broken blocks, the working environment of a drilling tool is worse, and drilling tool accidents occur at times. The tool joint is the weakest link of the drill string and is very easy to fail in the drilling process. According to statistics, 60% -75% of drill string failure accidents occur at the joint. The joint threads are the weakest link on the joint. The joint threads are in a special position in the whole drill string system, are subjected to various static or dynamic loads such as pretightening force, tension, torsion, bending and the like, and are corroded by drilling mud and a bottom medium, the stress is more complex, the damage of the joint threads is a main form of drilling tool accidents, the design reasonability and the reliability of the joint threads of the drilling tool are important conditions for ensuring the efficient and safe implementation of the whole drilling tool system, and the success or failure of drilling engineering is directly related.

In the common API standard drill tool joint, under the condition of complex load stress, the distribution of stress has unevenness, the load borne by the root of the external thread is the largest, the load is gradually decreased backwards, and the stress distribution is in the situation of high two sides and low middle. Thus, the load bearing strength of the drill bit and thus the entire drilling system is greatly reduced. Meanwhile, the existing API standard drilling tool threaded joint is difficult to position during shackle removal, and the operation speed is low.

With the increasing rigor of the well drilling technology and the development of new oil reservoir development technology, the development of a drill tool joint with uniform stress, high strength and rapid operation is urgently needed.

Application No.: 201210125083.8 relates to a special buttress thread oil casing coupling joint, include coupling and body through threaded connection, the axial middle part of coupling inner wall is provided with annular inside step column face, the both ends processing of coupling has standard buttress internal thread, the rear end that the buttress internal thread is close to the inside step column face is provided with the inside seal screw thread, processing has standard buttress external screw thread on the outer wall of body tip, the front end of buttress external screw thread is provided with the external seal screw thread, the inside seal screw thread adopts the special buttress thread that loading end flank angle is negative angle with the external seal screw thread. The invention adds the special buttress thread with a negative angle at the flank angle of the bearing surface at the end part of the standard buttress thread of the coupling and the pipe body to form a barb type tooth-type trapezoidal thread structure, and adds the bearing contact surface for resisting compression load at the end part of the thread, thereby greatly increasing the connection strength and the compression load resistance of the joint and simultaneously improving the torque resistance of the joint.

Application No.: 201810319628.6 is a special threaded connection comprising a box and a pin having metal contact surfaces including threaded portion contacts and non-threaded portion contacts. The contact of the thread part comprises the contact of the tooth top of the internal thread tooth of the female buckle and the tooth bottom of the external thread of the male buckle, and the contact of the bearing surfaces of the internal thread tooth and the external thread tooth. The non-thread part contact comprises inner thread sealing surface contact, outer thread sealing surface contact, first conical surface contact of the inner thread and the outer thread, and step surface contact of the inner thread and the outer thread. When the screwed joint is screwed down, the sealing surfaces of the inner thread and the outer thread form interference fit to play a role in sealing. According to the invention, through the improved thread structure and the certain distance between the position of the sealing surface and the step surface, compared with the prior art, the invention integrates high connection strength, high compression resistance, high torque resistance, high bending resistance, high temperature resistance and other performances, is convenient for field actual operation, and reduces the abnormal production time of the company A.

Application No.: 201520010738.6 provides a nonstandard 374.65mm buttress thread casing joint, which comprises a casing external thread joint (1) and a casing collar (2), wherein a buttress external thread is processed on the casing external thread joint (1), a matched buttress internal thread is processed on the casing collar (2), and the casing external thread joint (1) and the casing collar (2) are connected with the buttress external thread through the buttress internal thread; the diameter D4 of the large end of the external thread joint (1) of the sleeve is 374.65mm, and the intermediate diameter E7 of the external thread is 373.075 mm. Through adopting the utility model provides a nonstandard 374.65mm buttress thread casing joint can produce the 374.65mm nonstandard sleeve pipe that the oil field needs, satisfies the requirement of oil field exploration and development.

Application No.: 201410664517.0 discloses a direct connection type double-step threaded joint which includes a box and a pin, and further, in the axial direction of the direct connection type double-step threaded joint, the box has in order: the first thread section, the female joint shoulder transition section, the female joint torque shoulder, the female joint sealing surface and the second thread section; in the axial direction of the direct connection type double-step threaded joint, the male joint has in order: the male connector comprises a third thread section, a male connector sealing surface, a male connector torque shoulder, a male connector shoulder transition section and a fourth thread section; the first thread section and the second thread section are internal thread sections, the third thread section and the fourth thread section are external thread sections, the first thread section is in thread engagement with the fourth thread section, the second thread section is in thread engagement with the third thread section, and the female joint sealing surface and the male joint sealing surface are in interference sealing. The direct-connection type double-step threaded joint has good compression resistance and torque resistance, excellent air tightness and high connection strength.

Application No.: 201420221141.1 application date: 2014-04-30 discloses a hermetic seal threaded joint structure for an oil casing with a large-angle guide surface. The joint adopts a metal interference sealing mode of a conical surface to a spherical surface. The internal thread is provided with a spherical seal, the external thread is provided with a conical seal and a cylindrical transition surface, and the torque shoulder is designed into a negative angle. The thread form adopts a large-angle guide surface and a small-angle bearing surface, the internal thread tooth height is increased, the high connection strength of the connector is ensured, the interference magnitude of low threads is reduced, the annular stress of the threaded connector is reduced, and the thread anti-thread gluing capacity is improved. The design of the inner sealing arc surface and the outer sealing conical surface of the joint ensures that the joint has reasonable contact pressure distribution and metal interference deformation after being buckled, ensures the anti-thread gluing performance of the joint and greatly improves the sealing performance of the joint. The coupling is respectively provided with an internal thread 3, an internal cylindrical transition surface 4, an internal cylindrical surface and internal spherical surface connecting conical surface 5, an internal spherical surface sealing section 6, an internal spherical surface and coupling torque shoulder connecting conical surface 7, a coupling torque shoulder 8 and a coupling center connecting section 9 along the coupling end surface to the center in the axial direction. After the upper buckle is screwed, the inner cylindrical transition surface of the coupling is in clearance fit with the cylindrical surface of the pipe body, and the tooth top of the internal thread is in metal interference fit with the tooth bottom of the external thread, the sealing section of the internal spherical surface, the sealing section of the external conical surface and the torque shoulder. The included angle between the connecting conical surface 5 of the inner cylindrical surface and the inner spherical surface and the central axis is 2-25 degrees, and the radius of the spherical surface is 43-152 mm. The angle between the external thread and the connection conical surface 15 of the outer cylindrical surface and the axis is 65 degrees, and the end surface 14 of the tube body is-15 degrees. Transition circular arcs or spherical surfaces are arranged between the connecting sections on the coupling and the pipe body. The product specification is phi 139.7mm multiplied by 9.17mm, and the steel grade is P110. The external diameter and wall thickness of the pipe body and the coupling refer to the standard requirements of API5 CT. The thread taper is 1: 16, 5 threads are arranged on every 25.4mm of length, the height of the internal thread is designed to be 1.67mm-1.87mm, the height of the external thread is designed to be 1.575mm, the thread guide surface is 30-45 degrees, the bearing surface is 0 degree, and the interference of the main seal is selected to be 0.05mm-0.3 mm. The torque shoulder is designed to be-15 degrees, and the radius of the sealing spherical surface is 43mm-152 mm. The utility model discloses a patent has joint strength height, and it is convenient to go up to detain, and sealing performance is good, advantages such as easily processing.

The technical solutions of the above-disclosed technologies, the technical problems to be solved, and the advantageous effects thereof are all different from the present invention, and no technical inspiration exists in the above-disclosed technical documents for more technical features, technical problems to be solved, and advantageous effects thereof.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high strength becomes detains quick drilling tool joint has characteristics such as become to detain design, variable taper design, negative angle circular bead structure, and the operation is fast, stress distribution is even, intensity is high, advantages such as good reliability. The problems of uneven stress distribution, low connection strength, low operation speed and the like of the conventional drilling tool thread can be solved.

In order to achieve the purpose, the utility model discloses a following technical scheme, a high strength becomes detains quick drilling tool joint, including connecting the body, connect the body both ends and be public head, set up same special buttress thread simultaneously promptly at both ends, connect the axial terminal surface of the public head of body as main sealing circular bead terminal surface, main sealing circular bead terminal surface is sealed for the end column face, negative angle circular bead has been seted up to the outward flange of main sealing circular bead terminal surface, and negative angle circular bead is sealed for the conical surface.

Further, the negative angle shoulder angle is-11 to-14.

Further, the joint body is provided with a radial contracted annular stress relief groove at the tail end position of the special buttress thread.

Furthermore, the joint body is continuously processed with an auxiliary sealing shoulder end face at the tail end of the stress release groove, and the auxiliary sealing shoulder end face is sealed by an end column face.

Furthermore, the length of the stress relief groove is 24.10 mm-27.60 mm, and the diameter of the stress relief groove is 106.80 mm-136.62 mm.

Furthermore, an axial annular abdicating groove is formed in the end face of the auxiliary sealing shoulder.

Furthermore, the radial outer end of the abdicating groove and the end face of the auxiliary sealing shoulder are in concave arc transition.

Furthermore, the radial inner end of the abdicating groove and the axial tail end of the stress release groove are in concave arc transition.

Furthermore, the axial starting end of the stress release groove and the tail end of the thread are in convex arc transition.

Further, an inner chamfer is arranged on the inner wall of the outer end opening of the joint body.

Further, the joint body has an outer diameter of 177.80mm and an overall length of 559.20 mm.

Furthermore, the length of the special buttress thread is 208.20mm, a variable taper design is adopted, the taper is 1:14 at two ends, the thread pitch is 3 teeth per 25.4mm, and the crest flattening width is 1.726 mm.

Furthermore, the taper of the middle part of the special buttress thread is 1:9, the thread pitch is 5 teeth per 25.4mm, and the crest flattening width is 1.526 mm.

Furthermore, the thread form angle of the thread guide surface of the special buttress thread is 9-12 degrees, and the thread form angle of the thread bearing surface is 2-4 degrees.

Furthermore, the thread guide surface and the tooth top are in arc transitional connection, and the thread guide surface and the tooth bottom are in arc transitional connection.

Furthermore, the thread bearing surface and the tooth crest are in arc transitional connection, and the thread bearing surface and the tooth bottom are in arc transitional connection.

Compared with the prior art, the utility model following beneficial effect has:

the connector adopts the special buttress thread with variable taper design after parameter design optimization, the stress distribution is uniform, the problem of high two sides and low middle of the stress distribution is solved, and the connection strength and the anti-thread gluing capability are improved.

Stress release grooves are formed in the inner thread and the outer thread, so that the stress value is effectively reduced, the reduction amplitude reaches 30.0% -50%, and the extreme load resistance of the joint can be effectively improved due to the pressure distribution state.

The joint shoulder adopts a negative angle bearing surface, so that the sealing interference magnitude can be controlled, a certain degree of air sealing capability can be provided, the end parts are prevented from being separated from each other, and the corrosion resistance of a sealing surface is enhanced.

Therefore, the utility model has the advantages of uniform stress distribution, high connection strength, accurate positioning, high screwing-in and unscrewing speed and the like.

Drawings

FIG. 1 is a schematic sectional view of a high strength buckle-changing quick drill tool joint according to the present invention;

FIG. 2 is an enlarged view of a stress relief groove;

fig. 3 is an enlarged schematic view of the external thread.

In the figure: 1 is a joint body; 2 is the end surface of the main sealing shoulder; 3 is the end face of the auxiliary sealing shoulder; 4 is a stress release groove; 5 is an external thread; 6 is a negative angle shoulder; 7 is an inner chamfer; 8 is an internal flow guide channel; 9 is the diameter of the stress groove; 10 is the stress relief groove length; 11 is a transition arc of the abdicating groove; 12 is a transition arc of the stress relief groove; 13 is the crest flattening width; 14 is a tooth bottom transition arc; 15 is a tooth top transition great arc; 16 is a tooth top transition small arc; 17. a thread guide surface; 18. a threaded load-bearing surface; 19. a yielding groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1:

referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides a high strength becomes to detain quick drilling tool joint, includes and connects body 1, connects the body both ends and is public head, and same special buttress thread is seted up simultaneously at both ends promptly, and external screw thread 5 promptly, and the axial terminal surface of the public head of joint body is as main sealing circular bead terminal surface 2, and main sealing circular bead terminal surface is sealed for the end column face, negative angle circular bead 6 has been seted up to the outward flange of main sealing circular bead terminal surface, and the negative angle circular bead is sealed for the conical surface.

Further, the negative angle shoulder angle is-11 to-14.

Further, the joint body is provided with a radial contracted annular stress relief groove 4 at the tail end position of the special buttress thread.

Furthermore, the joint body is continuously processed with an auxiliary sealing shoulder end surface 3 at the tail end of the stress release groove, and the auxiliary sealing shoulder end surface is end-column surface sealing.

Furthermore, the length of the stress relief groove is 24.10 mm-27.60 mm, and the diameter of the stress relief groove is 106.80 mm-136.62 mm.

Furthermore, an axial annular abdicating groove 19 is formed in the end face of the auxiliary sealing shoulder.

Furthermore, the radial outer end of the abdicating groove and the end face of the auxiliary sealing shoulder are in concave arc transition.

Furthermore, the radial inner end of the abdicating groove and the axial tail end of the stress release groove are in concave arc transition.

Furthermore, the axial starting end of the stress release groove and the tail end of the thread are in convex arc transition.

Furthermore, an inner flow guide channel which is axially communicated is formed in the center of the joint body, and an inner chamfer 7 is formed in the inner wall of the outer end opening of the inner flow guide channel 8.

Further, the joint body has an outer diameter of 177.80mm and an overall length of 559.20 mm.

Furthermore, the length of the special buttress thread is 208.20mm, a variable taper design is adopted, the taper is 1:14 at two ends, the thread pitch is 3 teeth per 25.4mm, and the crest flattening width is 1.726 mm.

Furthermore, the taper of the middle part of the special buttress thread is 1:9, the thread pitch is 5 teeth per 25.4mm, and the crest flattening width is 1.526 mm.

Further, the thread form angle of the thread guide surface 17 of the special buttress thread is 9-12 degrees, and the thread form angle of the thread bearing surface 18 is 2-4 degrees.

Further, the thread guide surface and the tooth crest are in arc transition connection, namely, a tooth crest transition great arc 15, and the thread guide surface and the tooth bottom are in arc transition connection, namely, a tooth bottom transition arc 14.

Further, the thread bearing surface and the tooth crest are in arc transition connection, namely, a tooth crest transition small arc 16, and the thread bearing surface and the tooth bottom are in arc transition connection, namely, a tooth bottom transition arc 14.

A high-strength buckle-changing quick drilling tool joint is of a two-end structure, the outer diameter of the joint is 177.80mm, the total length of the joint is 559.20mm, a buckle changing design is adopted, the outer thread end is a non-standard special thread, and the inner diameter of the outer thread is 101.80mm, the length of the outer thread is 208.20mm, and the joint is connected with a pipeline with the same special non-standard thread;

the external thread of the joint adopts the special buttress thread after parameter design optimization, the stress distribution is uniform, the problem of high two sides and low middle part of the stress distribution is solved, and the connection strength and the anti-thread gluing capability are improved. The thread design adopts a variable taper design, the taper is 1:14 at two ends, the thread pitch is 3 teeth per 25.4mm, the crest flattening width is 1.726mm, the thread form angle of the thread guide surface is 9-12 degrees, and the thread form angle of the thread bearing surface is 2-4 degrees; the middle part of the joint thread adopts a taper of 1:9, the thread pitch is 5 teeth per 25.4mm, and the crest flattening width is 1.526 mm;

and a stress relief groove is designed on the external thread of the joint. When the joint bears static or dynamic load, the contact pressure distribution on the sealing surface is extremely uneven, the stress is mainly concentrated at the corner of the external thread shoulder, and the contact pressure of most areas of the sealing surface is almost zero, so that the stress distribution is not beneficial to the sealing of the joint. In order to relieve stress concentration and increase the contact area of the sealing surface, the stress release groove is formed in the outer thread shoulder, so that the stress value can be effectively reduced, the reduction amplitude reaches 30.0% -50%, and the fatigue failure resistance of the joint is further effectively improved. The length of the stress groove is 24.10 mm-27.60 mm, and the diameter of the stress groove is 106.80 mm-136.62 mm;

in the process of screwing, the change of the shoulder angle greatly affects the sealing performance of the sealing surface of the special threaded joint, and the shoulder angle is designed into a negative angle, so that the sealing magnitude of interference can be controlled, a certain degree of air sealing capability can be provided, the end parts are prevented from being separated from each other, and the corrosion resistance of the sealing surface is enhanced. Therefore, the edge of the shoulder sealing end face 2 adopts the negative-angle shoulder 6, the angle of the negative-angle shoulder is-11 degrees to-14 degrees, and the joint 1 has the characteristics of alignment, high make-up and break-out speed and the like. The negative angle shoulder 6 is a conical seal.

The joint 1 has two end structures which are the same and are connected with other non-standard special internal threaded pipes; the omission of the other end in fig. 1 is also clear.

As shown in fig. 1 and 3, the joint 1 has a conical surface and cylindrical surface two-stage sealing structure, and the main seal is a main seal shoulder end surface 2; the auxiliary seal is an auxiliary seal shoulder end surface 3 which is cylindrical seal; the edge of the shoulder sealing end face 2 adopts a negative-angle shoulder 6, the angle of the negative-angle shoulder is-11 degrees to-14 degrees, and the joint 1 has the characteristics of alignment, high make-up and break-out speed and the like. The negative angle shoulder 6 is a conical seal.

As shown in fig. 2, the joint 1 is provided with a stress relief groove 4, the length 10 of the stress relief groove is 24.10 mm-27.60 mm, and the diameter 9 of the stress relief groove is 106.80 mm-136.62 mm; the stress value is effectively reduced by 30.0-50%, and the fatigue failure resistance of the joint can be effectively improved by the pressure distribution state.

As shown in fig. 3, the external thread 5 of the joint 1 is a special buttress thread with variable taper design after parameter design optimization, the taper at two ends is 1:14, the thread pitch is 3 teeth per 25.4mm, and the crest flattening width is 1.726 mm; the middle part adopts 5 teeth with the taper of 1:9 and the thread pitch of 25.4mm, and the crest flattening width is 1.526 mm; the thread guide surface 17 thread form angle is 9-12 degrees, the thread bearing surface 18 thread form angle is 2-4 degrees, stress concentration can be effectively reduced, and joint connection strength is enhanced.

Example 2:

referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides a high strength becomes to detain quick drilling tool joint, includes and connects body 1, connects the body both ends and is public head, and same special buttress thread is seted up simultaneously at both ends promptly, and external screw thread 5 promptly, and the axial terminal surface of the public head of joint body is as main sealing circular bead terminal surface 2, and main sealing circular bead terminal surface is sealed for the end column face, negative angle circular bead 6 has been seted up to the outward flange of main sealing circular bead terminal surface, and the negative angle circular bead is sealed for the conical surface.

Further, the negative angle shoulder angle is-11 to-14.

Further, the joint body is provided with a radial contracted annular stress relief groove 4 at the tail end position of the special buttress thread.

Furthermore, the joint body is continuously processed with an auxiliary sealing shoulder end surface 3 at the tail end of the stress release groove, and the auxiliary sealing shoulder end surface is end-column surface sealing.

Furthermore, the length of the stress relief groove is 24.10 mm-27.60 mm, and the diameter of the stress relief groove is 106.80 mm-136.62 mm.

Furthermore, an axial annular abdicating groove 19 is formed in the end face of the auxiliary sealing shoulder.

Furthermore, the radial outer end of the abdicating groove and the end face of the auxiliary sealing shoulder are in concave arc transition.

Furthermore, the radial inner end of the abdicating groove and the axial tail end of the stress release groove are in concave arc transition.

Furthermore, the axial starting end of the stress release groove and the tail end of the thread are in convex arc transition.

Furthermore, an inner flow guide channel which is axially communicated is formed in the center of the joint body, and an inner chamfer 7 is formed in the inner wall of the outer end opening of the inner flow guide channel 8.

Further, the joint body has an outer diameter of 177.80mm and an overall length of 559.20 mm.

Furthermore, the length of the special buttress thread is 208.20mm, a variable taper design is adopted, the taper is 1:14 at two ends, the thread pitch is 3 teeth per 25.4mm, and the crest flattening width is 1.726 mm.

Furthermore, the taper of the middle part of the special buttress thread is 1:9, the thread pitch is 5 teeth per 25.4mm, and the crest flattening width is 1.526 mm.

Further, the thread form angle of the thread guide surface 17 of the special buttress thread is 9-12 degrees, and the thread form angle of the thread bearing surface 18 is 2-4 degrees.

Further, the thread guide surface and the tooth crest are in arc transition connection, namely, a tooth crest transition great arc 15, and the thread guide surface and the tooth bottom are in arc transition connection, namely, a tooth bottom transition arc 14.

Example 3:

referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides a high strength becomes to detain quick drilling tool joint, includes and connects body 1, connects the body both ends and is public head, and same special buttress thread is seted up simultaneously at both ends promptly, and external screw thread 5 promptly, and the axial terminal surface of the public head of joint body is as main sealing circular bead terminal surface 2, and main sealing circular bead terminal surface is sealed for the end column face, negative angle circular bead 6 has been seted up to the outward flange of main sealing circular bead terminal surface, and the negative angle circular bead is sealed for the conical surface.

Further, the negative angle shoulder angle is-11 to-14.

Further, the joint body is provided with a radial contracted annular stress relief groove 4 at the tail end position of the special buttress thread.

Furthermore, the joint body is continuously processed with an auxiliary sealing shoulder end surface 3 at the tail end of the stress release groove, and the auxiliary sealing shoulder end surface is end-column surface sealing.

Furthermore, the length of the stress relief groove is 24.10 mm-27.60 mm, and the diameter of the stress relief groove is 106.80 mm-136.62 mm.

Furthermore, an axial annular abdicating groove 19 is formed in the end face of the auxiliary sealing shoulder.

Furthermore, the radial outer end of the abdicating groove and the end face of the auxiliary sealing shoulder are in concave arc transition.

Furthermore, the radial inner end of the abdicating groove and the axial tail end of the stress release groove are in concave arc transition.

Furthermore, the axial starting end of the stress release groove and the tail end of the thread are in convex arc transition.

Furthermore, an inner flow guide channel which is axially communicated is formed in the center of the joint body, and an inner chamfer 7 is formed in the inner wall of the outer end opening of the inner flow guide channel 8.

Further, the joint body has an outer diameter of 177.80mm and an overall length of 559.20 mm.

Furthermore, the length of the special buttress thread is 208.20mm, a variable taper design is adopted, the taper is 1:14 at two ends, the thread pitch is 3 teeth per 25.4mm, and the crest flattening width is 1.726 mm.

Furthermore, the taper of the middle part of the special buttress thread is 1:9, the thread pitch is 5 teeth per 25.4mm, and the crest flattening width is 1.526 mm.

Further, the thread form angle of the thread guide surface 17 of the special buttress thread is 9-12 degrees, and the thread form angle of the thread bearing surface 18 is 2-4 degrees.

Example 4:

referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides a high strength becomes to detain quick drilling tool joint, includes and connects body 1, connects the body both ends and is public head, and same special buttress thread is seted up simultaneously at both ends promptly, and external screw thread 5 promptly, and the axial terminal surface of the public head of joint body is as main sealing circular bead terminal surface 2, and main sealing circular bead terminal surface is sealed for the end column face, negative angle circular bead 6 has been seted up to the outward flange of main sealing circular bead terminal surface, and the negative angle circular bead is sealed for the conical surface.

Further, the negative angle shoulder angle is-11 to-14.

Further, the joint body is provided with a radial contracted annular stress relief groove 4 at the tail end position of the special buttress thread.

Furthermore, the joint body is continuously processed with an auxiliary sealing shoulder end surface 3 at the tail end of the stress release groove, and the auxiliary sealing shoulder end surface is end-column surface sealing.

Furthermore, the length of the stress relief groove is 24.10 mm-27.60 mm, and the diameter of the stress relief groove is 106.80 mm-136.62 mm.

Furthermore, an axial annular abdicating groove 19 is formed in the end face of the auxiliary sealing shoulder.

Furthermore, the radial outer end of the abdicating groove and the end face of the auxiliary sealing shoulder are in concave arc transition.

Furthermore, the radial inner end of the abdicating groove and the axial tail end of the stress release groove are in concave arc transition.

Furthermore, the axial starting end of the stress release groove and the tail end of the thread are in convex arc transition.

Furthermore, an inner flow guide channel which is axially communicated is formed in the center of the joint body, and an inner chamfer 7 is formed in the inner wall of the outer end opening of the inner flow guide channel 8.

Further, the joint body has an outer diameter of 177.80mm and an overall length of 559.20 mm.

Example 5:

referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides a high strength becomes to detain quick drilling tool joint, includes and connects body 1, connects the body both ends and is public head, and same special buttress thread is seted up simultaneously at both ends promptly, and external screw thread 5 promptly, and the axial terminal surface of the public head of joint body is as main sealing circular bead terminal surface 2, and main sealing circular bead terminal surface is sealed for the end column face, negative angle circular bead 6 has been seted up to the outward flange of main sealing circular bead terminal surface, and the negative angle circular bead is sealed for the conical surface.

Further, the negative angle shoulder angle is-11 to-14.

Further, the joint body is provided with a radial contracted annular stress relief groove 4 at the tail end position of the special buttress thread.

Furthermore, the joint body is continuously processed with an auxiliary sealing shoulder end surface 3 at the tail end of the stress release groove, and the auxiliary sealing shoulder end surface is end-column surface sealing.

Furthermore, the length of the stress relief groove is 24.10 mm-27.60 mm, and the diameter of the stress relief groove is 106.80 mm-136.62 mm.

Furthermore, an axial annular abdicating groove 19 is formed in the end face of the auxiliary sealing shoulder.

Furthermore, the radial outer end of the abdicating groove and the end face of the auxiliary sealing shoulder are in concave arc transition.

Furthermore, the radial inner end of the abdicating groove and the axial tail end of the stress release groove are in concave arc transition.

Furthermore, the axial starting end of the stress release groove and the tail end of the thread are in convex arc transition.

Furthermore, an inner flow guide channel which is axially communicated is formed in the center of the joint body, and an inner chamfer 7 is formed in the inner wall of the outer end opening of the inner flow guide channel 8.

Example 6:

referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides a high strength becomes to detain quick drilling tool joint, includes and connects body 1, connects the body both ends and is public head, and same special buttress thread is seted up simultaneously at both ends promptly, and external screw thread 5 promptly, and the axial terminal surface of the public head of joint body is as main sealing circular bead terminal surface 2, and main sealing circular bead terminal surface is sealed for the end column face, negative angle circular bead 6 has been seted up to the outward flange of main sealing circular bead terminal surface, and the negative angle circular bead is sealed for the conical surface.

Further, the negative angle shoulder angle is-11 to-14.

Further, the joint body is provided with a radial contracted annular stress relief groove 4 at the tail end position of the special buttress thread.

Furthermore, the joint body is continuously processed with an auxiliary sealing shoulder end surface 3 at the tail end of the stress release groove, and the auxiliary sealing shoulder end surface is end-column surface sealing.

Furthermore, the length of the stress relief groove is 24.10 mm-27.60 mm, and the diameter of the stress relief groove is 106.80 mm-136.62 mm.

Furthermore, an axial annular abdicating groove 19 is formed in the end face of the auxiliary sealing shoulder.

Furthermore, the radial outer end of the abdicating groove and the end face of the auxiliary sealing shoulder are in concave arc transition.

Furthermore, the radial inner end of the abdicating groove and the axial tail end of the stress release groove are in concave arc transition.

Furthermore, the axial starting end of the stress release groove and the tail end of the thread are in convex arc transition.

Example 7:

referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides a high strength becomes to detain quick drilling tool joint, includes and connects body 1, connects the body both ends and is public head, and same special buttress thread is seted up simultaneously at both ends promptly, and external screw thread 5 promptly, and the axial terminal surface of the public head of joint body is as main sealing circular bead terminal surface 2, and main sealing circular bead terminal surface is sealed for the end column face, negative angle circular bead 6 has been seted up to the outward flange of main sealing circular bead terminal surface, and the negative angle circular bead is sealed for the conical surface.

Further, the negative angle shoulder angle is-11 to-14.

Further, the joint body is provided with a radial contracted annular stress relief groove 4 at the tail end position of the special buttress thread.

Furthermore, the joint body is continuously processed with an auxiliary sealing shoulder end surface 3 at the tail end of the stress release groove, and the auxiliary sealing shoulder end surface is end-column surface sealing.

Furthermore, the length of the stress relief groove is 24.10 mm-27.60 mm, and the diameter of the stress relief groove is 106.80 mm-136.62 mm.

Furthermore, an axial annular abdicating groove 19 is formed in the end face of the auxiliary sealing shoulder.

Example 8:

referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides a high strength becomes to detain quick drilling tool joint, includes and connects body 1, connects the body both ends and is public head, and same special buttress thread is seted up simultaneously at both ends promptly, and external screw thread 5 promptly, and the axial terminal surface of the public head of joint body is as main sealing circular bead terminal surface 2, and main sealing circular bead terminal surface is sealed for the end column face, negative angle circular bead 6 has been seted up to the outward flange of main sealing circular bead terminal surface, and the negative angle circular bead is sealed for the conical surface.

Further, the negative angle shoulder angle is-11 to-14.

Further, the joint body is provided with a radial contracted annular stress relief groove 4 at the tail end position of the special buttress thread.

Furthermore, the joint body is continuously processed with an auxiliary sealing shoulder end surface 3 at the tail end of the stress release groove, and the auxiliary sealing shoulder end surface is end-column surface sealing.

Example 9:

referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides a high strength becomes to detain quick drilling tool joint, includes and connects body 1, connects the body both ends and is public head, and same special buttress thread is seted up simultaneously at both ends promptly, and external screw thread 5 promptly, and the axial terminal surface of the public head of joint body is as main sealing circular bead terminal surface 2, and main sealing circular bead terminal surface is sealed for the end column face, negative angle circular bead 6 has been seted up to the outward flange of main sealing circular bead terminal surface, and the negative angle circular bead is sealed for the conical surface.

Further, the negative angle shoulder angle is-11 to-14.

Further, the joint body is provided with a radial contracted annular stress relief groove 4 at the tail end position of the special buttress thread.

Example 10:

referring to fig. 1 to 3, the present invention provides a technical solution: the utility model provides a high strength becomes to detain quick drilling tool joint, includes and connects body 1, connects the body both ends and is public head, and same special buttress thread is seted up simultaneously at both ends promptly, and external screw thread 5 promptly, and the axial terminal surface of the public head of joint body is as main sealing circular bead terminal surface 2, and main sealing circular bead terminal surface is sealed for the end column face, negative angle circular bead 6 has been seted up to the outward flange of main sealing circular bead terminal surface, and the negative angle circular bead is sealed for the conical surface.

Further, the negative angle shoulder angle is-11 to-14.

Although fig. 1 to 3 are used in all the above embodiments, it is obvious to those skilled in the art that separate drawings are not shown as long as the parts or structural features missing in the embodiments are removed from the drawings. As will be clear to the skilled person. Of course, the embodiments with more components are only the preferred embodiments, and the embodiments with fewer components are the basic embodiments, but the basic objects of the invention can also be achieved, so all of them are within the protection scope of the present invention.

All parts and parts which are not discussed in the present application and the connection mode of all parts and parts in the present application belong to the known technology in the technical field, and are not described again.

In the present application, the term "plurality" means two or more unless expressly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (16)

1. The utility model provides a high strength becomes quick drilling tool joint of detaining, includes the joint body, connects the body both ends and is public head, and same special buttress thread is seted up simultaneously at both ends promptly, connects the axial terminal surface of the public head of body as main sealing circular bead terminal surface, and main sealing circular bead terminal surface is sealed for the end post face, its characterized in that, negative angle circular bead has been seted up to the outward flange of main sealing circular bead terminal surface, and negative angle circular bead is sealed for the conical surface.

2. A high strength drop-out quick drill coupling as claimed in claim 1, wherein said negative angle shoulder angle is between-11 ° and-14 °.

3. A high strength variable buckle quick drill coupling as claimed in claim 1, wherein said coupling body is formed with radially constricted annular stress relief grooves at the distal end of the special buttress threads.

4. The high strength buckle changing quick drilling tool joint according to claim 3, wherein the joint body is further machined with an auxiliary sealing shoulder end surface at the end of the stress relief groove, and the auxiliary sealing shoulder end surface is an end-to-end cylindrical seal.

5. A high strength buckle change quick tool joint as claimed in claim 3 or 4, wherein the length of the stress relief groove is 24.10 mm-27.60 mm, and the diameter of the stress relief groove is 106.80 mm-136.62 mm.

6. The high strength buckle changing quick drilling tool joint according to claim 4, wherein the end face of the auxiliary sealing shoulder is provided with an axial annular relief groove.

7. The high strength buckle changing quick drilling tool joint according to claim 6, wherein the radially outer end of the abdicating groove and the end surface of the auxiliary sealing shoulder are in concave arc transition.

8. The high strength buckle changing quick drilling tool joint according to claim 7, wherein the radially inner end of the abdicating groove and the axial end of the stress relief groove are in concave arc transition.

9. The high strength buckle changing quick drill coupling according to claim 8, wherein the axial start of the stress relief groove and the end of the thread are in convex arc transition.

10. The high strength change buckle rapid drilling tool joint according to claim 3, 4 or 9, wherein the inner wall of the outer port of the joint body is provided with an inner chamfer.

11. A high strength buckle quick drill coupling according to claim 1 or 2 or 3 or 4 or 9, wherein the coupling body has an outer diameter of 177.80mm and an overall length of 559.20 mm.

12. The high strength variable thread quick drill coupling of claim 11, wherein the special buttress thread length is 208.20mm, the variable taper design is adopted, the taper is 1:14 at both ends, the thread pitch is 3 teeth per 25.4mm, and the crest flattened width is 1.726 mm.

13. The high strength variable thread quick drill coupling of claim 12, wherein the special buttress thread has a taper of 1:9 in the middle portion, a pitch of 5 teeth per 25.4mm, and a crest flattened width of 1.526 mm.

14. The high strength change-buckle rapid tool joint of claim 13, wherein the thread lead angle of the special buttress thread is 9 ° -12 °, and the thread back angle is 2 ° -4 °.

15. The high strength buckle changing quick drill coupling according to claim 14, wherein the thread guide surface is in circular arc transition connection with the crest and the thread guide surface is in circular arc transition connection with the root.

16. The high strength buckle quick tool joint of claim 14 wherein the thread bearing surface is in circular arc transition with the crest and the thread bearing surface is in circular arc transition with the root.

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