Method and apparatus for pressure based mass flow control

    公开(公告)号:US12000723B2

    公开(公告)日:2024-06-04

    申请号:US17651751

    申请日:2022-02-18

    发明人: Junhua Ding

    摘要: Mass flow controllers that can provide for improved bleeding time and can be manufactured with less complexity and cost are provided. A mass flow controller includes a body having a valve outlet bore defining a flow path and an adjustable valve configured to control flow of a gas through the flow path. A valve element includes an outlet orifice of the adjustable valve and is disposed within the bore. The mass flow controller further includes a pressure drop element disposed coaxially with the valve element within the bore. An upstream pressure sensor is configured to detect a pressure at a location in the flow path between the adjustable valve and the pressure drop element, and a controller is configured to determine a flow rate through the flow path based on pressure as detected by the upstream pressure sensor.

    DRILLING MUD FLOW METERING SYSTEM AND METHOD

    公开(公告)号:US20230266155A1

    公开(公告)日:2023-08-24

    申请号:US17678524

    申请日:2022-02-23

    摘要: A mud flow measurement system includes a flow pipe, a Coriolis meter, a differential pressure sensor, and a mud flow measurement module. The mud flow measurement module is configured to select a calibration curve corresponding to a drilling mud injected into the well, determine a measured density based on the signal from each of the vibration sensors and the selected calibration curve, determine a differential pressure across the Coriolis meter from the differential pressure sensor, and compute a calculated mass flow rate, Qmass, of the multiphase mud flow using equation






    Q
    mass

    =




    C
    d



    A
    t




    1
    -

    β
    4







    2

    ρ
    *
    Δ

    P




    ,




    where Cd is a calibration constant, At is a cross-sectional area of the measurement tube, β is a ratio of the internal diameters of the flow pipe the measuring tube, ρ is the density of the multiphase mud, and ΔP is the differential pressure across the Coriolis meter, where ρ is the measured density determined from the Coriolis meter.

    DIAGNOSTIC SYSTEM, DIAGNOSTIC METHOD, DIAGNOSTIC PROGRAM, AND FLOW RATE CONTROLLER

    公开(公告)号:US20180266865A1

    公开(公告)日:2018-09-20

    申请号:US15918871

    申请日:2018-03-12

    IPC分类号: G01F7/00 G01F1/88 G01F25/00

    摘要: The present invention intends to more accurately diagnose a function of a flow rate sensor regardless of a variation in measurement ambient condition. The present invention includes: a flow rate sensor for measuring the flow rate of fluid; a correction part adapted to measure an output value of the flow rate sensor or a value related to the output value (hereinafter collectively referred to as an “output-related value”), relates the measured output-related value and a corresponding measurement ambient condition to each other, and in accordance with the measurement ambient condition in measurement data, correct the output-related value or a reference value that is predetermined in order to determine whether the output-related value is normal; and a diagnostic part adapted to compare the output-related value and the reference value on the basis of a correction result by the correction part and correct the function of the flow rate sensor.

    Pressure-based gas flow controller with dynamic self-calibration

    公开(公告)号:US09910448B2

    公开(公告)日:2018-03-06

    申请号:US14345275

    申请日:2014-03-14

    摘要: A method of measuring a molecular rate of gas flow from an upstream source of gas at a pressure higher than a pressure of a destination includes flowing the gas through an upstream valve into a cavity of known volume, then through a restrictor element before proceeding to the destination, controlling the upstream valve to vary a flow rate of the gas through the upstream valve in a determined manner such that its average pressure in the cavity correlates with an average level of gas flow and such that variations in pressure in the cavity induced by varying the flow rate of gas through the upstream valve in the determined manner induce instantaneous pressure variations smaller than 30% of the average pressure in that cavity; and using the variations in the pressure in the cavity associated with varying the flow rate of gas through the upstream valve in the determined manner to determine the molecular rate of gas flow to the destination in real time.