CN217380442U - High anti-fatigue drill tool joint - Google Patents
High anti-fatigue drill tool joint Download PDFInfo
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- CN217380442U CN217380442U CN202220937189.7U CN202220937189U CN217380442U CN 217380442 U CN217380442 U CN 217380442U CN 202220937189 U CN202220937189 U CN 202220937189U CN 217380442 U CN217380442 U CN 217380442U
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Abstract
The utility model discloses a high antifatigue drilling tool connects. The female joint is provided with a female joint main shoulder, female joint threads and a female joint auxiliary shoulder, the female joint threads comprise conventional female thread teeth and three first special female thread teeth close to the female joint main shoulder, the tooth form angle beta of a bearing surface of the conventional female thread teeth is 25-45 degrees, and the angle difference alpha between the bearing surface of the special female thread and the bearing surface of the conventional female thread teeth is 0.1-5 degrees; the pin is provided with a pin main shoulder, a pin thread and a pin auxiliary shoulder, the pin thread comprises a conventional pin thread and first three special pin threads close to the pin auxiliary shoulder, the thread form angle beta of a bearing surface of the conventional pin thread is 25-45 degrees, and the angle difference alpha between the bearing surface of the special pin thread and the bearing surface of the conventional pin thread is 0.1-5 degrees. The utility model discloses a back is buckled in the moment of torsion was applyed with female joint to drilling tool male joint, can show and reduce joint thread bottom of the tooth stress extreme value, makes whole joint screw thread section stress distribution relatively more even.
Description
Technical Field
The utility model relates to an oil well tubular column instrument that uses in the oil and gas exploration development process especially relates to a high antifatigue drilling tool connects suitable for oil and gas exploitation such as super deep well, crooked well and extended reach well.
Background
Oil well string tools as referred to herein include oil casing, tubing, and drill string components (kelly, drill pipe, heavy-walled drill pipe, drill collars, crossover joints, etc.).
The oil and gas drilling and production industry is always breaking through the existing drilling limit, and the drilling quantity and depth records of special working conditions are continuously refreshed. The breakthrough of the drilling limit has higher and higher requirements on the technical quality of the petroleum drilling tool, in order to meet the drilling technical requirements, in the development of the drill string joint thread technology, a designer reasonably adds an inner shoulder structure on the basis of the API drill tool joint single-shoulder structure, optimizes parameters such as thread taper, thread pitch and the like, and the torsional strength of the developed high-torsion-resistant and ultrahigh-torsion-resistant drill tool joint is improved by more than 70 percent compared with the API drill tool joint.
Along with the great increase of the applied torque, the local stress concentration of the corresponding thread teeth is more and more obvious, and the local thread tooth bottom of the joint often generates early fatigue cracks in use, even the fatigue cracks cause quick puncture and fracture, thereby bringing great economic loss to an oil field. Stress on each thread of the existing drill tool joint under a complex load condition has the characteristics of large stress of the threads at two ends and small stress of the threads at the middle section, and the stress distribution is unreasonable, so that the potential of the threads at the middle section cannot be fully exerted, and the threads at two ends fail due to premature fatigue.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high antifatigue drilling tool joint, mainly solve the defect that above-mentioned prior art exists, compare with current oil drilling tool joint helicitic texture, design special screw thread tooth form structure at screw thread both ends high stress area, the lock fit back on the moment of torsion is applyed to pin joint and box, can show and reduce joint screw thread root stress extreme value, it is relatively more even to make whole joint screw thread section stress distribution, at super deep well, have very good fatigue resistance in the rotatory drilling-in process of harsh well conditions such as crooked well section or big displacement well, can improve drilling string life by a wide margin.
In order to achieve the above purpose, the technical scheme of the utility model is that:
the utility model provides a high antifatigue drill joint, includes the same box and the male joint of internal and external diameter which characterized in that: the female joint is provided with a female joint main shoulder, female joint threads and a female joint auxiliary shoulder, the female joint threads comprise conventional female thread teeth and first three special female thread teeth close to the female joint main shoulder, the tooth form angle beta of a bearing surface of the conventional female thread teeth is 25-45 degrees, the angle difference alpha of the bearing surface of the special female thread and the bearing surface of the conventional female thread teeth is 0.1-5 degrees, and the tooth form angle of the bearing surface of the special female thread is beta-alpha;
the male connector is provided with a male connector main shoulder, a male connector thread and a male connector auxiliary shoulder, the male connector thread comprises a conventional male thread tooth and first three special male thread teeth close to the male connector auxiliary shoulder, the tooth form angle beta of a bearing surface of the conventional male thread tooth is 25-45 degrees, the angle difference alpha of the bearing surface of the special male thread and the bearing surface of the conventional male thread tooth is 0.1-5 degrees, and the tooth form angle of the bearing surface of the special male thread is beta-alpha.
The high anti-fatigue drill tool joint is characterized in that: the range of the thread taper of the female joint and the thread taper of the male joint is 1: 3-1: 32.
The high anti-fatigue drill tool joint is characterized in that: the range of the thread lead of the female joint and the thread lead of the male joint is 4.23 mm-12.7 mm.
The high anti-fatigue drill tool joint is characterized in that: the female connector and the male connector are made of steel or titanium alloy or aluminum alloy.
Compared with the prior art, the utility model, have following outstanding advantage: the utility model discloses in the female joint screw thread section, the preceding three screw thread that is close to female joint owner circular bead is special female screw thread, in the male joint screw thread section, the preceding three that is close to the vice circular bead of male joint is special male screw thread, when the lock fit on the moment of torsion is applyed to male joint and female joint, special female screw thread region has certain clearance with it between the conventional screw thread of cooperation male joint, there is certain clearance between the regional conventional screw thread of female joint with special male screw thread, corresponding region has been alleviated in the clearance of these two places because the high stress that produces greatly warp, can show and reduce joint both ends screw thread root stress extreme value, screw thread middle section stress increases, make whole joint screw thread section stress distribution more even, and then guarantee oil drilling tool is in super deep well, harsh well conditions such as crooked well section or big displacement well rotary drilling in-process has very good fatigue resistance ability.
Drawings
Fig. 1 is a schematic view of the male connector and the female connector of the present invention.
Fig. 2 is a local area a in the schematic diagram of the snap-fit of the male connector and the female connector of the present invention.
Fig. 3 is a local area B in the schematic diagram of the snap-fit of the male connector and the female connector of the present invention.
FIG. 4 is a schematic view of a conventional box thread profile.
FIG. 5 is a schematic view of a conventional pin thread profile.
Fig. 6 is a schematic view of the special female thread profile of the present invention.
Fig. 7 is a schematic view of the special male thread profile of the present invention.
Fig. 8 is a schematic view showing a conventional female thread ridge superimposed on a special female thread ridge.
Fig. 9 is a schematic view showing a conventional male thread ridge superimposed with a special male thread ridge.
FIG. 10 is a graph of stress distribution trend of each thread of the box joint analyzed by finite element numerical simulation of the joints of the examples and comparative examples.
FIG. 11 is a graph showing the stress distribution of threads of a pin in a finite element numerical simulation analysis of the joints of examples and comparative examples.
In the figure, 1 is a female joint; 11-a female connector main shoulder; 12-box threads; 121-conventional female thread ridge; 1211-conventional box thread bearing surface; 1212-conventional female thread crest; 1213-conventional female thread ridge guide surfaces; 1214-conventional female thread root; 122-special female thread ridge; 1221-special box thread bearing surface; 1222 special female thread crest; 1223-special female thread ridge guide surface; 1224-special female thread root; 13-a female connector secondary shoulder; 2-a male connector; 21-male connector main shoulder; 22-male joint threads; 221-conventional male thread ridge; 2211-conventional male thread ridge guide surface; 2212-conventional male thread root; 2213-conventional pin bearing face; 2214-conventional male thread crest; 222-special male thread ridge; 2221-special male thread ridge guide surface; 2222-special male thread root; 2223-Special pin thread bearing surface; 2224-special male thread crest; 23-male connector sub shoulder; a to k are male connector thread teeth; l-u are female joint screw threads; wherein a, b and c are the first three special male thread teeth close to the secondary shoulder of the male joint; l, m and n are the first three special female threads near the main shoulder of the female connector.
Detailed Description
Referring to fig. 1-9, the present invention discloses a drill tool joint with high fatigue resistance. As shown in the figure: the special female thread bearing surface 1221 comprises a female joint 1 and a male joint 2 with the same inner diameter and outer diameter, wherein the female joint 1 is provided with a female joint main shoulder 11, female joint threads 12 and a female joint auxiliary shoulder 13, the female joint threads comprise a conventional female thread ridge 121 and first three special female thread ridges 122 close to the female joint main shoulder 11, the tooth form angle beta of a conventional female thread bearing surface 1211 is 25-45 degrees, the angle difference alpha between the special female thread bearing surface 1221 and the conventional female thread bearing surface 1211 is 0.1-5 degrees, and the tooth form angle of the special female thread bearing surface 1221 is beta-alpha; the pin 2 is provided with a pin main shoulder 21, a pin thread 22 and a pin secondary shoulder 23, the pin thread comprises a conventional pin thread 221 and three first special pin threads 222 close to the pin secondary shoulder 23, the tooth form angle β of the conventional pin thread bearing surface 2213 is 25-45 °, the angle difference α between the special pin thread bearing surface 2223 and the conventional pin thread bearing surface 2213 is 0.1-5 °, and the tooth form angle of the special pin thread bearing surface 2223 is β - α.
In the utility model, the taper range of the female joint thread 12 and the taper range of the male joint thread 22 are 1: 3-1: 32.
The utility model discloses in, female joint screw thread 12 helical pitch and the 22 helical pitch scopes of pin joint screw thread are 4.23mm ~ 12.7 mm.
In the utility model discloses, the material of female joint 1 and male joint 2 is steel or titanium alloy or aluminum alloy.
In the machining process of the female joint thread 12, all thread teeth are machined by a conventional female thread tool, and then the first three special female thread teeth 122 close to a main shoulder 11 of the female joint are machined by a special female thread tool;
in the process of processing the male connector thread 22, all thread teeth are processed by a conventional male thread tool, and then the first three special male thread teeth 222 close to the male connector secondary shoulder 23 are processed by a special male thread tool.
Examples
A double-shoulder steel drill rod joint with the steel grade of 120ksi, the outer diameter of 127.0mm and the inner diameter of 65.09mm is selected, and as shown in the figures 1-9, the high-fatigue-resistance petroleum drilling tool joint and the machining method thereof comprise a female joint 1 and a male joint 2 which are the same in inner diameter and outer diameter.
The female joint 1 is provided with a female joint main shoulder 11, female joint threads 12 and a female joint auxiliary shoulder 13, the female joint threads comprise a conventional female thread ridge 121 and three first special female thread ridges 122 close to the female joint main shoulder 11, the tooth form angle beta of a conventional female thread ridge bearing surface 1211 is 30 degrees, and the angle difference alpha between the special female thread bearing surface 1221 and the conventional female thread ridge bearing surface 1211 is 2 degrees;
the male connector 2 is provided with a male connector main shoulder 21, a male connector thread 22 and a male connector secondary shoulder 23, the male connector thread comprises a conventional male thread ridge 221 and three first special male thread ridges 222 close to the male connector secondary shoulder 23, the tooth form angle beta of a conventional male thread ridge bearing surface 2213 is 30, and the angle difference alpha between the special male thread bearing surface 2223 and the conventional male thread ridge bearing surface 2213 is 2 degrees;
in the process of processing the female joint thread 12, all thread teeth are processed by a conventional female thread tool, and the first three special female thread teeth 122 close to the main shoulder 11 of the female joint are processed by a special female thread tool;
in the process of processing the male connector thread 22, all thread teeth are processed by a conventional male thread tool, and the first three special male thread teeth 222 close to the male connector auxiliary shoulder 23 are processed by a special male thread tool;
the taper of the female joint thread 12 and the taper of the male joint thread 22 are 1: 16;
the lead range of the box thread 12 and the pin thread 22 is 7.26 mm;
a30600 N.m torque is applied to the joint, and the stress values of the threads of the female joint and the male joint are analyzed through finite element numerical simulation.
Comparative example
A double-shoulder steel drill rod joint with the steel grade of 120ksi, the outer diameter of 127.0mm and the inner diameter of 65.09mm is selected and comprises a female joint 1 and a male joint 2 which have the same inner diameter and outer diameter.
The female joint 1 is provided with a female joint main shoulder 11, female joint threads 12 and a female joint auxiliary shoulder 13, and the female joint threads are conventional female thread teeth 121;
the male connector 2 is provided with a male connector main shoulder 21, a male connector thread 22 and a male connector auxiliary shoulder 23, and the male connector thread comprises a conventional male thread ridge 221;
the taper of the female joint thread 12 and the taper of the male joint thread 22 are 1: 16;
the lead range of the box thread 12 and the pin thread 22 is 7.26 mm;
a30600 N.m torque is applied to the joint, and the stress values of the threads of the female joint and the male joint are analyzed through finite element numerical simulation.
Compared with the finite element numerical simulation analysis result of the comparative example connector, as shown in fig. 10, by adopting the connector thread structure technology of the utility model, the stress values at the two ends of the female connector are obviously reduced, the stress value of the middle thread section is slightly improved, and the whole stress distribution is more excellent; as shown in figure 11, adopt prior art, the stress value of the j and k screw thread of male joint is higher than the local plastic deformation that takes place of joint material yield strength, has dangerous hidden danger, and adopts the utility model discloses a joint thread structure technique, the male joint both ends stress value all reduces to some extent, and middle screw thread section stress value improves to some extent, and whole stress distribution is more excellent.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. All equivalent changes and modifications made according to the content of the claims of the present invention shall fall within the technical scope of the present invention.
Claims (4)
1. The utility model provides a high antifatigue drill tool connects, includes the same box (1) of internal and external diameter and male joint (2), its characterized in that: the female joint (1) is provided with a female joint main shoulder (11), female joint threads (12) and a female joint auxiliary shoulder (13), the female joint threads comprise a conventional female thread tooth (121) and three front special female thread teeth (122) close to the female joint main shoulder (11), the tooth form angle beta of a conventional female thread tooth bearing surface (1211) is 25-45 degrees, the angle difference alpha between the special female thread bearing surface (1221) and the conventional female thread tooth bearing surface (1211) is 0.1-5 degrees, and the tooth form angle of the special female thread bearing surface (1221) is beta-alpha;
the male connector (2) is provided with a male connector main shoulder (21), a male connector thread (22) and a male connector auxiliary shoulder (23), the male connector thread comprises a conventional male thread tooth (221) and three first special male thread teeth (222) close to the male connector auxiliary shoulder (23), the tooth form angle beta of a conventional male thread tooth bearing surface (2213) is 25-45 degrees, the angle difference alpha between the special male thread bearing surface (2223) and the conventional male thread tooth bearing surface (2213) is 0.1-5 degrees, and the tooth form angle of the special male thread bearing surface (2223) is beta-alpha.
2. A high fatigue resistance drill collar as recited in claim 1, wherein: the taper range of the female joint thread (12) and the taper range of the male joint thread (22) are 1: 3-1: 32.
3. A high fatigue resistance drill collar as recited in claim 1, wherein: the lead range of the female joint thread (12) and the lead range of the male joint thread (22) are 4.23-12.7 mm.
4. A high fatigue resistance drill collar as recited in claim 1, wherein: the female joint (1) and the male joint (2) are made of steel or titanium alloy or aluminum alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220937189.7U CN217380442U (en) | 2022-04-22 | 2022-04-22 | High anti-fatigue drill tool joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220937189.7U CN217380442U (en) | 2022-04-22 | 2022-04-22 | High anti-fatigue drill tool joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217380442U true CN217380442U (en) | 2022-09-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220937189.7U Active CN217380442U (en) | 2022-04-22 | 2022-04-22 | High anti-fatigue drill tool joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217380442U (en) |
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2022
- 2022-04-22 CN CN202220937189.7U patent/CN217380442U/en active Active
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