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  • Open Access


    An Analysis of the Static and Dynamic Behavior of the Hydraulic Compensation System of a Multichannel Valve

    Jikang Xu1,4, Ruichuan Li1,2,*, Yi Cheng2, Yanchao Li3, Junru Yang3, Chenyu Feng4, Xinkai Ding2, Huazhong Zhang5

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.7, pp. 1817-1836, 2023, DOI:10.32604/fdmp.2023.022602

    Abstract Electro-hydraulic proportional valve is the core control valve in many hydraulic systems used in agricultural and engineering machinery. To address the problem related to the large throttling losses and poor stability typically associated with these valves, here, the beneficial effects of a triangular groove structure on the related hydraulic response are studied. A mathematical model of the pressure compensation system based on the power-bond graph method is introduced, and the AMESim software is used to simulate its response. The results show that the triangular groove structure increases the jet angle and effectively compensates for the More > Graphic Abstract

    An Analysis of the Static and Dynamic Behavior of the Hydraulic Compensation System of a Multichannel Valve

  • Open Access


    Sand Production Prediction and Safe Differential Pressure Determination in a Deepwater Gas Field

    Hao Qiu1, Yi Wu1, Min Wen1, Xuesong Xing1, Zening Hou1, Nan Ma1, Zizhen Zhang2, Rui Zhang2,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.3, pp. 579-592, 2023, DOI:10.32604/fdmp.2022.020297

    Abstract Sand production is a critical issue during the development of offshore oil and gas fields. Certain gas fields (e.g. the AB gas field) have high porosity and high permeability, and with water at the bottom of the reservoir, the risk of sand production greatly increases at high differential pressures. Based on reservoir properties, geological conditions, production requirements, and well logging data, in this study an ultrasonic time difference method, a B index method, and a S index method are used together with a model of rock mass failure (accounting for water influx and pressure depletion)… More >

  • Open Access


    Influence of the Hole Chamfer on the Characteristics of a Multi-hole Orifice Flowmeter

    Caizhe Hao1, Xiaoming Song1, *, Zhining Jia1

    FDMP-Fluid Dynamics & Materials Processing, Vol.15, No.4, pp. 391-401, 2019, DOI:10.32604/fdmp.2019.07771

    Abstract In order to analyze the influence of the hole chamfer on the metering performances of a Multi-hole Orifice Flowmeter and optimize the related orifice structure, a multi-hole orifice flowmeter with DN80 and throttle ratio of 0.45 was considered in the present study. The flow field characteristics were determined in the framework of a CFD technique. The results show that the multi-hole orifice flowmeter with filleting transition around the throttle orifice has higher accuracy in a wide range of the space of parameters, and is more suitable for accurate measurement of fluid in process control. More >

  • Open Access


    Research on a Triaxial Rate of Penetration (ROP) Model Related to Unloading in Oil & Gas Drilling

    Hui Zhang1, Deli Gao1,2, Xiaopin Xie1

    CMES-Computer Modeling in Engineering & Sciences, Vol.90, No.1, pp. 47-64, 2013, DOI:10.3970/cmes.2013.090.047

    Abstract In oil & gas drilling engineering, the rock breaking efficiency as well as the trajectory of the Well should be quantitatively and accurately described by an ideal triaxial Rate of Penetration (ROP) model, taking into account the various objective and subjective factors. However, with the existing triaxial ROP models, it is difficult to achieve these goals. The applications of the existing ROP models are limited, especially in under-balanced drilling (air drilling, foam drilling etc.), because the unloading effect (i.e. the effect of the bottom hole differential pressure on the formation force) has been rarely considered.… More >

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