Identification of flow cut-off pattern and prediction of cut-off time of gas–liquid two-phase flow in pipeline-riser system DOI

Tianyu Liu,

Hanxuan Wang, Suifeng Zou

и другие.

Physics of Fluids, Год журнала: 2025, Номер 37(5)

Опубликована: Май 1, 2025

For offshore pipeline-riser systems, cyclic flow cut-off in slugging pattern should be identified and necessarily mitigated to satisfy the requirement of normal operation gas–liquid separator. Since conventional studies on identification were not directly related harmfulness decision control, this study develops a risk assessment method for riser systems based characteristic parameters outlet signals, achieving an accuracy exceeding 90% at different valve openings. Notably, maintains exceptional performance under high-pressure conditions, with reaching 96.74% 10 MPa. On other hand, focuses prediction duration time cycle instead period. We establish predictive model choking conditions. Validation across diverse pipeline demonstrates strong reliability model, exhibiting maximum errors 30%. The model's coefficients can fitted by small dataset without significant loss accuracy, are conservative, indicating applicability field operation. These findings offer theoretical insights practical solutions enhancing operational safety oil gas transportation systems.

Язык: Английский

Experimental study on flow regime classification and riser pressure fluctuation characteristics in the long-distance pipeline S-shaped riser system DOI
Yeqi Cao, Qiang Xu,

Yuwen Li

и другие.

Experimental Thermal and Fluid Science, Год журнала: 2025, Номер unknown, С. 111467 - 111467

Опубликована: Март 1, 2025

Язык: Английский

Процитировано

1
Experimental investigation of coherent structures and acoustic properties of a steam jet condensation in crossflow using proper orthogonal decomposition DOI

Aoyue Hong,

Qiang Xu, Tengfei Nie

и другие.

International Journal of Multiphase Flow, Год журнала: 2025, Номер unknown, С. 105146 - 105146

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0
Potential variables forautomatic slugging control by topside choking in pipeline–riser systems DOI Creative Commons
Yaohua Du,

Hanxuan Wang,

Quanhong Wu

и другие.

Deleted Journal, Год журнала: 2025, Номер 2(3)

Опубликована: Май 16, 2025

When using topside choking to eliminate severe slugging in offshore pipeline–riser systems, the resulting stability and effectiveness depend critically on choice of variables associated control model. In this study, both potential process manipulated are investigated via manual experiments. Monotonicity linearity adopted as principles for selecting optimal variables, availability signals an field is also considered. Both amplitude-domain time-domain studied, which five recommended variable, while resistance factor valve variable; other may act auxiliary How determine set value variable discussed. Validation experiments with automatic show that optimized enable faster stabilization. This study offers a reference design fields.

Язык: Английский

Процитировано

0
The Prediction of the Valve Opening Required for Slugging Control in Offshore Pipeline Risers Based on Empirical Closures and Valve Characteristics DOI Creative Commons

Jiqiang Fu,

Quanhong Wu,

Jie Sun

и другие.

Journal of Marine Science and Engineering, Год журнала: 2025, Номер 13(5), С. 981 - 981

Опубликована: Май 19, 2025

Topside choking is a common way to eliminate severe slugging flow in pipeline riser systems offshore oil and gas fields. However, lack of fundamentals two-phase gives rise difficulty the model selection valves effective control valves. In this study, prediction valve opening required for based on measurable parameters investigated experimentally theoretically. It found that resistance coefficient factor almost same risers simple vertical pipes when eliminated. Therefore, fluid can be approximated by conditions pipe. The target achieve dual-frequency fluctuation, it quantitatively converted pressure drop valve. Based these two empirical enclosures, worked out using fraction theoretical resistance. non-slip better than drift-flux final optimal opening. An explicit calculation corresponding established, making more convenient select design stage exploitation. average absolute error proposed +0.01%, which smaller simulation performed OLGA 7.0 software (+4.91% before tuning +0.08% after tuning). A field case with flexible S-shape proves good applicability (with deviation ±2%). applications uncertain factors operation are also discussed.

Язык: Английский

Процитировано

0
Identification of flow cut-off pattern and prediction of cut-off time of gas–liquid two-phase flow in pipeline-riser system DOI

Tianyu Liu,

Hanxuan Wang, Suifeng Zou

и другие.

Physics of Fluids, Год журнала: 2025, Номер 37(5)

Опубликована: Май 1, 2025

For offshore pipeline-riser systems, cyclic flow cut-off in slugging pattern should be identified and necessarily mitigated to satisfy the requirement of normal operation gas–liquid separator. Since conventional studies on identification were not directly related harmfulness decision control, this study develops a risk assessment method for riser systems based characteristic parameters outlet signals, achieving an accuracy exceeding 90% at different valve openings. Notably, maintains exceptional performance under high-pressure conditions, with reaching 96.74% 10 MPa. On other hand, focuses prediction duration time cycle instead period. We establish predictive model choking conditions. Validation across diverse pipeline demonstrates strong reliability model, exhibiting maximum errors 30%. The model's coefficients can fitted by small dataset without significant loss accuracy, are conservative, indicating applicability field operation. These findings offer theoretical insights practical solutions enhancing operational safety oil gas transportation systems.

Язык: Английский

Процитировано

0