CONTROL OF MANAGED PRESSURE DRILLING
    2.
    发明申请
    CONTROL OF MANAGED PRESSURE DRILLING 审中-公开
    管理压力钻井控制

    公开(公告)号:US20160138350A1

    公开(公告)日:2016-05-19

    申请号:US14649782

    申请日:2013-12-05

    Abstract: Method for controlling bottomhole pressure in a borehole during managed pressure drilling. In the drilling procedure fluid is circulated down a drillstring and to surface through an annulus between the drillstring and an inner-wall of the borehole. A compressor/pump is used to inject gas into the returning drilling fluid at a gas injection point. The method comprises receiving a target bottomhole pressure; determining actual bottomhole pressure during the procedure; and adjusting a variable as directed by a feedback controller, which operates to reduce the difference between the target pressure and the measured pressure. The manipulated variable may be one or any combination of: (1) pressure of drilling fluid at the entry of the fluid into the drillstring, (2) the flow rate of drilling fluid out of the drillstring into the annulus, (3) pressure of the gas exiting from the compressor, and (4) the injection rate of the gas.

    Abstract translation: 在管理压力钻井期间控制井眼井底压力的方法。 在钻井过程中,流体沿着钻柱循环并通过钻柱和钻孔的内壁之间的环形区域循环。 压缩机/泵用于在气体注入点将气体注入回流钻井液中。 该方法包括接收目标井底压力; 确定程序期间的实际井底压力; 以及根据反馈控制器的指示调整变量,所述反馈控制器用于减小目标压力和所测量的压力之间的差异。 操纵变量可以是以下一种或任意组合:(1)钻井液在流入钻柱时的压力,(2)钻井液从钻柱进入环空的流量,(3)压力 从压缩机排出的气体,和(4)气体的喷射速率。

    Downhole determination of drilling state

    公开(公告)号:US09631477B2

    公开(公告)日:2017-04-25

    申请号:US14072677

    申请日:2013-11-05

    CPC classification number: E21B47/024 E21B44/005

    Abstract: A method for determining a drilling state of a bottom hole assembly in a wellbore includes acquiring one or more downhole sensor measurements and processing the sensor measurements using a downhole processor to determine a drilling state of the bottom hole assembly. An operating state of the bottom hole assembly may be automatically changed in response to the determined drilling state. A method for computing a dynamic drilling energy of a bottom hole assembly includes acquiring at least one sensor measurement and processing the sensor measurements to obtain at least one of (i) an energy of axial motion of the bottom hole assembly, (ii) an energy of rotational motion of the bottom hole assembly, and (iii) an energy of lateral motion of the bottom hole assembly.

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