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A Prediction Method for Sealing Contact Pressure Stress of Special Threaded Joints under Thermal Recovery Conditions

A special thread and sealing contact technology, applied in special data processing applications, instruments, design optimization/simulation, etc., can solve the problems of not considering the temperature cycle characteristics of casing joint materials, sealing contact pressure stress thread connection leakage failure, etc., to achieve The effect of treating the failure problem of seal leakage and ensuring the integrity of the seal

Active Publication Date: 2021-04-30
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

At present, the design of casing strings in thermal recovery wells does not consider the temperature cycle characteristics of casing joint materials during long-term service, and the reduction of sealing contact pressure stress leads to the hidden danger of leakage failure of threaded connections

Method used

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  • A Prediction Method for Sealing Contact Pressure Stress of Special Threaded Joints under Thermal Recovery Conditions
  • A Prediction Method for Sealing Contact Pressure Stress of Special Threaded Joints under Thermal Recovery Conditions
  • A Prediction Method for Sealing Contact Pressure Stress of Special Threaded Joints under Thermal Recovery Conditions

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Embodiment Construction

[0028] The present invention is described in further detail below:

[0029] Aiming at the problem of sealing failure of special threaded joints under thermal recovery conditions, the temperature cycle characteristics (such as image 3 ), including the strength reduction at high temperature of steam injection (such as Figure 4 ), stress relaxation in the soaking stage of the well (such as Figure 5 ), the Bauschinger effect of multiple rounds of operations (such as Figure 6 ), construct the elastic-plastic equation of the joint material, the stress relaxation model, and the Bauschinger effect model. Combined with material anisotropy, the relational expression describing strength change and contact stress change is introduced, and the contact pressure stress prediction model of joint radial main seal / axial auxiliary seal is established, and a special thread joint seal contact pressure stress prediction method is formed.

[0030] (1) Numerical simulation of special threaded ...

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Abstract

The invention discloses a method for predicting the contact pressure stress of the sealing contact pressure of special threaded joints under thermal recovery conditions. First, numerically simulate the stress field distribution of the joint sealing contact surface at the initial room temperature and the optimum make-up torque; ‑Based on the operating conditions, characterize the temperature cycle characteristics of joint materials during long-term service; thirdly, based on the temperature cycle characteristics, construct the mechanical model of joint material strength and contact stress; finally, introduce the constructed material strength and contact stress model, combined with material Anisotropy, establish a numerical model of the contact pressure stress of the radial main seal / axial auxiliary seal of the joint during long-term service, and form a prediction method for the contact pressure stress of the special threaded joint seal under thermal recovery conditions. The present invention introduces the influence of temperature cycles on contact pressure stress during multiple rounds of injection-production operations in thermal recovery, provides a prediction method for contact pressure stress, and provides a solid foundation for the safety evaluation of service casing strings in thermal recovery wells and the prevention and treatment of leakage failure. Technical Support.

Description

technical field [0001] The invention belongs to the application field of oil and gas exploitation engineering, and in particular relates to a method for predicting the sealing contact pressure stress of special threaded joints in thermal recovery working conditions. Background technique [0002] The casing connection of thermal recovery wells mainly adopts API partial ladder thread, and its sealing performance mainly depends on the filled thread compound. The experimental results show that the thread grease filled at a temperature below 180°C can play a sealing role, but when the temperature rises above 200°C, the thread compound is prone to volatilization and deterioration, and the sealing performance of the connecting thread fails. [0003] The special threaded joint adds a radial main seal and an axial auxiliary seal torque shoulder structure in the structural design, no longer relying solely on the thread interference fit and the sealing effect of thread grease. That is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F119/14
CPCG06F30/23G06F2119/06
Inventor 王航杨尚谕朱丽娟路彩虹田涛蒋龙韩礼红
Owner BC P INC CHINA NAT PETROLEUM CORP
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