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    • 6. 发明授权
    • Annulus pressure operated downhole choke and associated methods
    • 环形压力操作井下扼流圈及相关方法
    • US6073698A
    • 2000-06-13
    • US370450
    • 1999-08-10
    • Roger L. SchultzKent Beck
    • Roger L. SchultzKent Beck
    • E21B34/00E21B34/06E21B34/10E23B34/10E23B49/08
    • E21B34/108E21B34/063E21B2034/002
    • A downhole choke and associated methods provide enhanced efficiency and accuracy in well sampling and testing operations due to its capability for substantially minimizing the amount of time needed to establish steady state flow conditions in a well, and the ability to sample fluids downhole at varying downhole flow restrictions. In a described embodiment, a downhole choke is operable to restrict fluid flow therethrough by applying a predetermined fluid pressure to an annulus formed between the choke and the wellbore. The downhole choke has an axial flow passage formed therethrough, a portion of which has interchangeable flow areas. The flow areas are interchanged upon application of the predetermined fluid pressure, and again interchanged upon expiration of a time delay. One of the flow areas permits substantially unrestricted fluid flow therethrough, and another of the flow areas permits restricted flow therethrough.
    • 井下扼流圈和相关方法由于其能够大幅度地最小化在井中建立稳态流动条件所需的时间量以及在不同井下流动下在井下采样的能力的能力,从而提高了井采样和测试操作的效率和精度。 限制 在所描述的实施例中,井下扼流圈可操作以通过对形成在扼流圈和井眼之间的环形空间施加预定流体压力来限制流体流动。 井下扼流器具有穿过其形成的轴向流动通道,其一部分具有可互换的流动区域。 流动区域在施加预定流体压力时互换,并且在时间延迟期满时再次互换。 一个流动区域允许基本上不受限制的流体流过其中,另一个流动区域允许限制流过其中。