Effect of reservoir’s permeability and porosity on the performance of cellular development model for enhanced geothermal system

Investigation of Static and Dynamic Seal Performances of a Rubber O-Ring

Effects of steel properties on the local buckling response of high strength pipelines subjected to reverse faulting

Buckling failure mode analysis of buried X80 steel gas pipeline under reverse fault displacement

Analysis of buried pipelines subjected to reverse fault motion using the vector form intrinsic finite element method

Buckling behaviour analysis of a buried steel pipeline in rock stratum impacted by a rockfall

. Reverse fault movement is one of the threats for the structural integrity of buried oil-gas pipelines caused by earthquakes. Buckling behavior of the buried pipeline was investigated by finite element method. Effects of fault displacement, internal pressure, diameter-thick ratio, buried depth and friction coefficient on buckling behavior of the buried steel pipeline were discussed. The results show that internal pressure is the most important factor that affecting the pipeline buckling pattern. Buckling mode of non-pressure pipeline is collapse under reverse fault. Wrinkles appear on buried pressure pipeline when the internal pressure is more than 0.4 Pmax. Four buckling locations appear on the buried pressure pipeline under bigger fault displacement. There is only one wrinkle on the three locations of the pipeline in the rising formation, but more wrinkles on the fourth location. Number of the wrinkle ridges and length of the wavy buckling increase with the increasing of friction coefficient. Number of buckling location decreases gradually with the decreasing of diameter-thick ratio. A protective device of buried pipeline was designed for preventing pipeline damage crossing fault area for its simple structure and convenient installation. Those results can be used to safety evaluation, maintenance and protection of buried pipelines crossing fault area.

/pdf/numerical-simulation-of-buckling-behavior-of-the-buried-4smy42b6cx.pdf

Numerical simulation of buckling behavior of the buried steel pipeline under reverse fault displacement

In order to study the performance of the dynamic seal and static seal of D-ring, the FEM models of D-ring and O-ring were built, and the process of reciprocating seal of the D-ring was simulated. In addition, the effects of pre-compression, medium pressure, friction coefficient, and rubber hardness on sealing performance were discussed. The friction coefficients between rubber sealing ring and steel part, under different lubrication conditions, were measured through the experiment. The results show that, in static seal, the maximum contact stress of the D-ring increases with the increasing of pre-compression, friction coefficient, medium pressure, and rubber hardness. Besides, O-ring can be well replaced by D-ring in static seal. Since it can avoid distortion and twisting effectively in reciprocating dynamic seal and prolong its working life, D-ring has a better sealing performance in reciprocating seal than O-ring. As the friction coefficient grows, the amplitude of the maximum contact stress fluctuation increases as well as the fluctuation of the cross-section deformation which has a bad influence on sealing performance and fatigue life of the D-ring.

Static and Dynamic Sealing Performance Analysis of Rubber D-Ring Based on FEM

https://onlinelibrary.wiley.com/doi/pdf/10.1002/ese3.473

Production capacity and mining plan optimization of fault/fracture‐controlled EGS model in Gonghe Basin

https://onlinelibrary.wiley.com/doi/pdf/10.1002/ese3.524

Han Zhang

Papers

Buckling behaviour analysis of a buried steel pipeline in rock stratum impacted by a rockfall

Numerical simulation of buckling behavior of the buried steel pipeline under reverse fault displacement

Static and Dynamic Sealing Performance Analysis of Rubber D-Ring Based on FEM

Production capacity and mining plan optimization of fault/fracture‐controlled EGS model in Gonghe Basin

Local buckling evolution mechanism of a buried steel pipe under fault movements