油套管螺纹接头
By designing segmented internal threads and specific parameters for oil casing threaded joints, the problems of easy sticking and poor sealing performance in existing threaded joints have been solved, achieving efficient anti-sticking and sealing effects while reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENGYANG VALIN STEEL TUBE CO LTD
- Filing Date
- 2025-09-17
- Publication Date
- 2026-07-17
AI Technical Summary
Existing oil casing threaded joints are prone to problems such as thread sticking, poor sealing performance, and high processing costs.
Design an oil casing threaded joint, in which the internal thread is divided into a first internal thread section and a second internal thread section. By setting specific tooth height, tooth groove width and inclination angle relationships, appropriate clearance and interference are formed to improve anti-galling performance and sealing performance, and reduce production and processing costs.
It achieves excellent anti-sticking and sealing performance, reduces the fluctuation of the fastening torque, reduces the risk of leakage, and lowers production and processing costs.
Smart Images
Figure CN224515136U_ABST
Abstract
Claims
1. A tubing-casing threaded joint characterized by, The oil casing threaded joint has a central axis (L), and the oil casing threaded joint includes: An external threaded connector (1) is provided with an external thread, wherein the external thread has a tooth height H1; An internal threaded connector (2) is provided with an internal thread, wherein the external thread and the internal thread are engaged. The internal thread includes a first internal thread segment (21) and a second internal thread segment (22) connected to the first internal thread segment (21). The first internal thread segment (21) has a tooth height H2, and the second internal thread segment (22) has a tooth height H3. Along the central axis (L), the second internal thread segment (22) is located between the end face of the first internal thread segment (21) and the external threaded connector (1). The relationship between the tooth height H1 and the tooth height H2 satisfies: H2-H1=0.2mm~0.4mm, the relationship between the tooth height H1 and the tooth height H3 satisfies: H3-H1=0mm~0.05mm, and the relationship between the tooth groove width L23 of the second internal thread segment (22) and the tooth thickness width L11 of the external thread satisfies: L23-L11=0.02mm~0.05mm.
2. A tubing-casing threaded joint according to claim 1, characterized in that, The relationship between the tooth thickness width L11 of the external thread and the tooth groove width L21 of the first internal thread segment (21) satisfies: L21-L11=0.02mm~0.05mm.
3. A tubing-casing threaded joint according to claim 1, characterized in that, The second internal thread segment (22) includes 1 to 3 internal thread teeth.
4. A tubing-casing thread joint according to any one of claims 1 to 3, characterized in that The external thread has an outer bearing surface (11) and an outer guide surface (12). Along the central axis (L), the outer bearing surface (11) and the outer guide surface (12) are located on both sides of the external thread and are inclined relative to the central axis (L). The inclination angle α1 of the outer bearing surface (11) is in the range of -4° to 3°, and the inclination angle α2 of the outer guide surface (12) is in the range of 10° to 40°.
5. A tubing-casing threaded joint according to claim 4, characterized in that, The internal thread has an inner bearing surface (23) and an inner guide surface (24). Along the central axis (L), the inner bearing surface (23) and the inner guide surface (24) are located on both sides of the internal thread and are inclined relative to the central axis (L). The inner bearing surface (23) has an inclination angle β1 and the inner guide surface (24) has an inclination angle β2, where β1 = α1 and β2 = α2.
6. A tubing-casing thread joint according to any one of claims 1 to 3, characterized in that The tooth height H1 of the external thread is in the range of 1.5mm to 2.3mm.
7. A tubing-casing thread joint according to any one of claims 1 to 3, characterized in that The pitch of the external thread and the pitch of the internal thread are both P, and the pitch P ranges from 3.17 mm to 8.47 mm.
8. A tubing-casing thread joint according to any one of claims 1 to 3, characterized in that The taper of the external thread and the taper of the internal thread both range from 1:16 to 1:
18.
9. The oil casing threaded joint according to any one of claims 1 to 3, characterized in that, The relationship between the tooth thickness width L11 and the tooth groove width L12 of the external thread satisfies: L11 = L12.
10. A tubing-casing threaded joint according to claim 9, characterized in that, The tooth thickness width L11 of the external thread ranges from 1.58 mm to 4.23 mm.