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A direct connection type double-step threaded joint

A threaded joint and double-step technology, which is applied in the field of double-step threaded joints, can solve problems such as the inability of the casing to enter the well, and achieve the effects of good compression resistance and torque resistance, excellent air-tight performance, and excellent connection strength

Active Publication Date: 2016-05-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the wellbore conditions are complex, the casing may not be able to go into the well

Method used

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  • A direct connection type double-step threaded joint
  • A direct connection type double-step threaded joint
  • A direct connection type double-step threaded joint

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Embodiment Construction

[0035] The direct-connection double-step threaded joint of the present invention will be further explained and described in conjunction with the accompanying drawings and specific examples below. However, such explanations and descriptions do not constitute undue limitations on the technical solution of the present invention.

[0036] figure 1 with figure 2 Each shows the structure of the direct connection type double-step threaded joint in an embodiment of the present invention.

[0037] Such as figure 1 with figure 2As shown, the direct connection type double-step threaded joint T in this embodiment includes a sleeve female joint 1 and a male joint 2 . In the axial direction of the direct-connection double-step threaded joint, the female joint has in turn: a first threaded section 11, a female joint shoulder transition section 12, a female joint torque shoulder 13, a female joint sealing surface 14 and a second threaded section 15, while the male joint 2 has in turn: t...

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Abstract

The invention provides a direct connection type double-step threaded joint comprising a female joint and a male joint. In the axial direction of the direct connection type double-step threaded joint, the female joint successively comprises a first threaded section, a female joint shoulder transition section, a female joint torque shoulder, a female joint sealing surface and a second threaded section. In the axial direction of the direct connection type double-step threaded joint, the male joint successively comprises a third threaded section, a male joint sealing surface, a male joint torque shoulder, a male joint shoulder transition section and a fourth threaded section. The first threaded section and the second threaded section are internal threaded sections, and the third threaded section and the fourth threaded section are external threaded sections. The first threaded section and the fourth threaded section are in threaded engagement and the second threaded section and the third threaded section are in threaded engagement. The female joint sealing surface and the male joint sealing surface are in interference seal. The direct connection type double-step threaded joint has favorable anti-compressing and anti-torque capability, excellent gas sealing performance and greater connecting strength.

Description

technical field [0001] The invention relates to a threaded joint, in particular to a double-step threaded joint. Background technique [0002] With the continuous development of oil extraction, the oil and gas fields that are relatively easy to exploit are decreasing year by year, followed by the exploitation of deeper and harsher oil and gas field areas, and the mining technology has also changed from the original conventional mining method to the unconventional mining method. Oil casings are usually subjected to complex working conditions such as internal pressure, external pressure, tension, compression, bending and torsion in the downhole. Therefore, in this case, the service conditions of oil casings become very severe. . For example, in the process of shale gas exploitation, long horizontal wells and the use of staged hydraulic fracturing technology put forward more stringent performance requirements for the connection joint structure of oil casing. It meets the tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/08
Inventor 詹先觉王琍
Owner BAOSHAN IRON & STEEL CO LTD
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