CN211950369U - Small-bore high-strength buckle-changing quick drilling tool joint - Google Patents
Small-bore high-strength buckle-changing quick drilling tool joint Download PDFInfo
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- CN211950369U CN211950369U CN202020176252.0U CN202020176252U CN211950369U CN 211950369 U CN211950369 U CN 211950369U CN 202020176252 U CN202020176252 U CN 202020176252U CN 211950369 U CN211950369 U CN 211950369U
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Abstract
The utility model discloses a small-bore high-strength variable-buckle quick drilling tool joint, which comprises a joint body, wherein two ends of the joint body are simultaneously provided with threads, the right end of the joint body is provided with API standard external threads, the left end of the joint body is provided with internal threads which are special buttress threads, the center of the joint body is provided with an internal flow guide channel which is axially communicated, the joint of the right end part of the internal threads of the joint body and the internal flow guide channel forms an inner axial end face, the inner axial end face serves as a main sealing circular bead end face, and the main sealing circular bead end face is sealed by an end column face; the joint of the end face of the main sealing shoulder and the internal thread is provided with a negative angle shoulder, the negative angle shoulder is a conical surface seal, the angle of the negative angle shoulder ranges from-11 degrees to-14 degrees, and the joint body is provided with a radially contracted annular stress release necking ring table at the starting end of the special buttress thread. The novel steel pipe has the characteristics of small outer diameter, a negative-angle shoulder structure, variable taper design, variable buckle design and the like, and is high in operation speed, uniform in stress distribution, high in strength and good in reliability.
Description
Technical Field
The utility model belongs to the technical field of the new well drilling, later stage well cementation and the workover treatment technique of complicated oil reservoir and specifically relates to a small-bore 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 difficult-to-use reserves such as low permeability and broken blocks and complex oil reservoirs, the working environment of a drilling tool is worse, and a drilling tool joint is the weakest link of a drilling string and is very easy to lose efficacy in the drilling process. The common API standard drilling tool thread has non-uniform stress distribution under the condition of complex load stress, and the load borne by the root of the external thread is the largest and is gradually decreased backwards in sequence. Under the working state of the underground, the thread is under the action of various loads, and the stress distribution of the thread is in a 'high two sides and low middle' situation. Thus, the load-bearing strength of 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. Therefore, the development of complex reservoirs puts increasing demands on drill tool joints, and small-bore, high-strength, fast-operating joints are in urgent need.
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 tooth height of the internal thread is designed to be 1.67mm-1.87mm, the tooth 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 small-bore high strength becomes detains quick drilling tool joint, overcome current drilling tool screw thread stress distribution inhomogeneous, the external diameter is big, joint strength is low, the slow scheduling problem of operation speed, have that external diameter size is little, negative angle circular bead structure, become the tapering design, become characteristics such as detain the design, the operation speed is fast, stress distribution is even, intensity is high, good reliability.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a small-caliber high-strength variable-buckle quick drilling tool joint comprises a joint body, wherein threads are simultaneously arranged at two ends of the joint body, API standard external threads are arranged at the right end of the joint body, internal threads are arranged at the left end of the joint body and are special buttress threads, an axially-through internal flow guide channel is arranged at the center of the joint body, an inner axial end face is formed at the joint of the right end part of the internal threads of the joint body and the internal flow guide channel, the inner axial end face serves as a main sealing shoulder end face, and the main sealing shoulder end face is sealed by an end column face; the joint of the end face of the main sealing shoulder and the internal thread is provided with a negative angle shoulder, the negative angle shoulder is a conical surface seal, the angle of the negative angle shoulder is-11 degrees to-14 degrees, and a radially contracted annular stress release necking ring platform is processed at the starting end position of the special buttress thread of the joint body; the length of the stress relief neck ring platform is 19.10 mm-25.60 mm, and the diameter of the stress relief neck ring platform is 86.80 mm-128.88 mm.
Further, an auxiliary sealing shoulder end face is continuously machined at the initial end of the stress release necking ring table of the joint body, and the auxiliary sealing shoulder end face is end-column face sealing; and the end surface of the auxiliary sealing shoulder is provided with an axial annular positioning convex part.
Furthermore, the radial outer end of the positioning convex part and the end face of the auxiliary sealing shoulder are in concave arc transition, and the radial inner end of the positioning convex part and the axial tail end of the stress release necking ring platform are in concave arc transition; and the axial tail end of the stress release necking ring platform and the thread starting end adopt convex circular arc transition.
Further, the outer diameter of the joint body is 118mm-127 mm.
Furthermore, the special buttress thread adopts a variable taper design, the taper at two ends is 1:14, the thread pitch is 3 teeth per 25.4mm, and the crest flattening width is 1.65 mm; the middle part of the special buttress thread adopts a taper of 1:9, the thread pitch is 5 teeth per 25.4mm, and the crest flattening width is 1.48 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:
1. the special buttress thread which is optimized through parameter design is adopted in the joint internal thread, 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. 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 1.65mm, 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;
2. 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 1.48 mm;
3. a stress release necking ring platform is designed on the internal 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, a stress release necking ring table is arranged at the external 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 release neck ring platform is 19.10 mm-25.60 mm, and the diameter of the stress release neck ring platform is 86.80 mm-128.88 mm;
4. the connector adopts a variable buckle design, and one end of the external thread adopts an API standard thread and is connected with a conventional API standard drilling tool; the other end is a nonstandard special thread which is connected with a pipeline with the same special nonstandard thread;
5. the bearing surface of the joint adopts a negative angle shoulder, the angle of the bearing surface is-11 degrees to-14 degrees, and the angle of the guide surface is +3 degrees to +12 degrees. The joint 1 has the characteristics of accurate positioning, high make-up and break-out speed and the like.
6. The outer diameter of the connector is 128-168 mm, and is smaller than the size of a conventional API connector.
The joint has small outer diameter size and can adapt to the well condition of complex oil reservoirs; 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. A stress release necking ring platform is designed on the internal 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 the utility model has the advantages of small caliber, uniform stress distribution, high connection strength, accurate positioning, high speed of screwing on and off, and the like.
Drawings
FIG. 1 is a schematic cross-sectional view of a small-bore high-strength buckle-changing quick drill tool joint according to the present invention;
FIG. 2 is an enlarged schematic view of a stress relief neck ring land;
fig. 3 is an enlarged view of the 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 neck ring platform; 5 is an external thread; 6 is a negative angle shoulder; 7 is the left outer end face of the joint; 8 is an internal flow guide channel; 9 is the diameter of the stress release neck ring platform; 10 is the length of the stress release neck ring platform; 11 is a positioning convex part transition arc; 12 is a stress release necking ring platform transition arc; 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 is a thread guide surface; 18 is a threaded load-bearing surface; and 19 is a positioning convex part.
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: a small-caliber high-strength variable-buckle quick drilling tool joint comprises a joint body 1, wherein threads are simultaneously arranged at two ends of the joint body, as shown in figure 1, the right end of the joint body 1 can be provided with external threads or internal threads (not shown in the figure, but omitted, and clear to a person skilled in the art), for example, the right end of the joint body 1 is provided with API standard external threads, and then can be connected with an API standard external threaded pipe; the left end of the connector body 1 is provided with an internal thread which is a special buttress thread, namely the internal thread 5, the joint of the right end part of the internal thread of the connector body and the inner diversion channel forms an inner axial end face, the inner axial end face serves as a main sealing shoulder end face 2, the main sealing shoulder end face is end cylindrical seal, the joint of the main sealing shoulder end face and the internal thread is provided with a negative angle shoulder 6, and the negative angle shoulder is conical seal.
Furthermore, the angle of the negative angle shoulder is-11 degrees to-14 degrees, and the angle of the guide surface is +3 degrees to +12 degrees.
Furthermore, although the joint body is provided with the radially contracted annular stress release neck ring platform 4 at the starting end position of the special buttress thread and is in fitting connection with the stress release groove formed outside the joint in matching connection, the joint in matching connection with the stress release groove is not shown in the drawing, according to the application, a person skilled in the art can simultaneously manufacture the joint matched with the stress release neck ring platform 4 and the stress release groove in matching connection. 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.
Furthermore, the joint body is continuously processed with an auxiliary sealing shoulder end surface 3 at the initial end of the stress release neck ring platform, and the auxiliary sealing shoulder end surface is an end cylindrical surface seal.
Further, the length of the stress relief neck ring table is 19.10 mm-25.60 mm, and the diameter of the stress relief neck ring table is 86.80 mm-128.88 mm.
Furthermore, an axial annular positioning convex part 19 is arranged on the end surface of the auxiliary sealing shoulder.
Furthermore, the radial outer end of the positioning convex part and the end face of the auxiliary sealing shoulder are in concave arc transition.
Furthermore, the radial inner end of the positioning convex part and the axial tail end of the stress release necking ring platform are in concave arc transition.
Furthermore, the axial tail end of the stress release neck ring platform and the thread starting end adopt convex circular arc transition.
Furthermore, an inner flow guide channel which is axially communicated is formed in the center of the joint body.
Further, the outer diameter D of the joint body is 118mm-127 mm.
Furthermore, the special buttress thread adopts a variable taper design, the taper at two ends is 1:14, the thread pitch is 3 teeth per 25.4mm, and the crest flattening width is 1.65 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 1.48 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. Can effectively reduce stress concentration and enhance the joint connection strength.
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.
1. The special buttress thread which is optimized through parameter design is adopted in the joint internal thread, 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. 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 1.65mm, 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;
2. 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 1.48 mm;
3. a stress release necking ring platform is designed on the internal 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, a stress release necking ring table is arranged at the external 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 release neck ring platform is 19.10 mm-25.60 mm, and the diameter of the stress release neck ring platform is 86.80 mm-128.88 mm;
4. the connector adopts a variable buckle design, and one end of the external thread adopts an API standard thread and is connected with a conventional API standard drilling tool; the other end is a nonstandard special thread which is connected with a pipeline with the same special nonstandard thread;
5. the bearing surface of the joint adopts a negative angle shoulder, the angle of the bearing surface is-11 degrees to-14 degrees, and the angle of the guide surface is +3 degrees to +12 degrees. The joint 1 has the characteristics of accurate positioning, high make-up and break-out speed and the like.
6. The outer diameter of the connector is 128-168 mm, and is smaller than the size of a conventional API connector.
The joint has small outer diameter size and can adapt to the well condition of complex oil reservoirs; 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. A stress release necking ring platform is designed on the internal 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 the utility model has the advantages of small caliber, uniform stress distribution, high connection strength, accurate positioning, high speed of screwing on and off, and the like.
Example 2:
referring to fig. 1 to 3, the present invention provides a technical solution: a small-caliber high-strength variable-buckle quick drilling tool joint comprises a joint body 1, wherein threads are simultaneously arranged at two ends of the joint body, as shown in figure 1, the right end of the joint body 1 can be provided with external threads or internal threads (not shown in the figure, but omitted, and clear to a person skilled in the art), for example, the right end of the joint body 1 is provided with API standard external threads, and then can be connected with an API standard external threaded pipe; the left end of the connector body 1 is provided with an internal thread which is a special buttress thread, namely the internal thread 5, the joint of the right end part of the internal thread of the connector body and the inner diversion channel forms an inner axial end face, the inner axial end face serves as a main sealing shoulder end face 2, the main sealing shoulder end face is end cylindrical seal, the joint of the main sealing shoulder end face and the internal thread is provided with a negative angle shoulder 6, and the negative angle shoulder is conical seal.
Furthermore, the angle of the negative angle shoulder is-11 degrees to-14 degrees, and the angle of the guide surface is +3 degrees to +12 degrees.
Furthermore, although the joint body is provided with the radially contracted annular stress release neck ring platform 4 at the starting end position of the special buttress thread and is in fitting connection with the stress release groove formed outside the joint in matching connection, the joint in matching connection with the stress release groove is not shown in the drawing, according to the application, a person skilled in the art can simultaneously manufacture the joint matched with the stress release neck ring platform 4 and the stress release groove in matching connection. 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.
Furthermore, the joint body is continuously processed with an auxiliary sealing shoulder end surface 3 at the initial end of the stress release neck ring platform, and the auxiliary sealing shoulder end surface is an end cylindrical surface seal.
Further, the length of the stress relief neck ring table is 19.10 mm-25.60 mm, and the diameter of the stress relief neck ring table is 86.80 mm-128.88 mm.
Furthermore, an axial annular positioning convex part 19 is arranged on the end surface of the auxiliary sealing shoulder.
Furthermore, the radial outer end of the positioning convex part and the end face of the auxiliary sealing shoulder are in concave arc transition.
Furthermore, the radial inner end of the positioning convex part and the axial tail end of the stress release necking ring platform are in concave arc transition.
Furthermore, the axial tail end of the stress release neck ring platform and the thread starting end adopt convex circular arc transition.
Furthermore, an inner flow guide channel which is axially communicated is formed in the center of the joint body.
Further, the outer diameter D of the joint body is 118mm-127 mm.
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 (8)
1. A small-caliber high-strength variable-buckle quick drilling tool joint comprises a joint body, wherein threads are simultaneously arranged at two ends of the joint body, API standard external threads are arranged at the right end of the joint body, internal threads are arranged at the left end of the joint body and are special buttress threads, an axially-through internal flow guide channel is arranged at the center of the joint body, an inner axial end face is formed at the joint of the right end part of the internal threads of the joint body and the internal flow guide channel, the inner axial end face serves as a main sealing shoulder end face, and the main sealing shoulder end face is sealed by an end column face;
the connector is characterized in that a negative angle shoulder is arranged at the joint of the end face of the main sealing shoulder and the internal thread, the negative angle shoulder is a conical surface seal, the angle of the negative angle shoulder is-11 degrees to-14 degrees, and a radially contracted annular stress release necking ring platform is processed at the starting end of the special buttress thread of the connector body; the length of the stress relief neck ring platform is 19.10 mm-25.60 mm, and the diameter of the stress relief neck ring platform is 86.80 mm-128.88 mm.
2. The small-caliber high-strength variable-buckle quick drilling tool joint as claimed in claim 1, wherein an auxiliary sealing shoulder end face is continuously machined at the initial end of the stress release neck ring table of the joint body, and the auxiliary sealing shoulder end face is an end cylindrical seal; and the end surface of the auxiliary sealing shoulder is provided with an axial annular positioning convex part.
3. The small-caliber high-strength buckle-changing quick drilling tool joint as claimed in claim 2, wherein the radially outer end of the positioning convex part and the end face of the auxiliary sealing shoulder are in concave arc transition, and the radially inner end of the positioning convex part and the axial end of the stress release necking ring platform are in concave arc transition; and the axial tail end of the stress release necking ring platform and the thread starting end adopt convex circular arc transition.
4. A small-bore high-strength change-buckle rapid drill coupling according to claim 1, 2 or 3, wherein the coupling body has an outer diameter of 118mm to 127 mm.
5. The small-caliber high-strength variable-buckle quick drill joint as claimed in claim 4, wherein the special buttress thread is designed to be tapered, the taper at two ends is 1:14, the thread pitch is 3 teeth per 25.4mm, and the crest flat cutting width is 1.65 mm; the middle part of the special buttress thread adopts a taper of 1:9, the thread pitch is 5 teeth per 25.4mm, and the crest flattening width is 1.48 mm.
6. The small-caliber high-strength thread-change quick drill joint as claimed in claim 5, wherein 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.
7. The small-caliber high-strength variable-buckle rapid drilling tool joint according to claim 6, wherein the thread guide surface is in arc transition connection with the crest, and the thread guide surface is in arc transition connection with the root.
8. The small-caliber high-strength variable-buckle rapid drilling tool joint according to claim 6, wherein the thread bearing surface and the crest are in circular arc transitional connection, and the thread bearing surface and the root are in circular arc transitional connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020176252.0U CN211950369U (en) | 2020-02-17 | 2020-02-17 | Small-bore high-strength buckle-changing quick drilling tool joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020176252.0U CN211950369U (en) | 2020-02-17 | 2020-02-17 | Small-bore high-strength buckle-changing quick drilling tool joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211950369U true CN211950369U (en) | 2020-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020176252.0U Expired - Fee Related CN211950369U (en) | 2020-02-17 | 2020-02-17 | Small-bore high-strength buckle-changing quick drilling tool joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211950369U (en) |
-
2020
- 2020-02-17 CN CN202020176252.0U patent/CN211950369U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201117 Termination date: 20220217 |
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| CF01 | Termination of patent right due to non-payment of annual fee |