公开(公告)号：US6016288A

公开(公告)日：2000-01-18

申请号：US687207

申请日：1996-07-25

申请人： Terrence G. Frith

发明人： Terrence G. Frith

IPC分类号： E21B47/18 ,  G01V1/40

CPC分类号： E21B47/187

摘要： An improved servo-driven pulser is disclosed, for use in measurement while drilling applications. In the pulser, a battery powered on-board DC electric motor is used to operate a servo-valve, which in turn adjusts internal tool fluid pressures to cause operation of a main valve to substantially reduce mud flow to a drill bit, thereby creating a positive pressure pulse detectable at the surface. De-energizing the motor driving the pilot valve results in re-adjustment of internal fluid pressures, causing the main valve to reopen, thereby terminating the pressure pulse.

摘要翻译： 公开了一种改进的伺服驱动脉冲发生器，用于在钻孔应用时的测量。 在脉冲发生器中，使用电池供电的板载DC电动机来操作伺服阀，其继而调节内部工具流体压力，以使主阀的操作基本上减少到钻头的泥浆流量，由此产生 表面可检测到正压脉冲。 对驱动先导阀的马达的断电导致内部流体压力的重新调节，使主阀重新打开，从而终止压力脉冲。

公开(公告)号：US07243740B2

公开(公告)日：2007-07-17

申请号：US10984466

申请日：2004-11-09

申请人： Terrence G. Frith

发明人： Terrence G. Frith

IPC分类号： E21B4/02

CPC分类号： E21B21/002

摘要： A filter assembly including a primary flow passageway having at least one filter deployed therein and a secondary flow passageway having a bypass filter deployed therein is provided. The filter assembly further includes a bypass valve assembly configured to selectively open and close the secondary flow passageway when a fluid pressure is respectively above and below an adjustable, predetermined threshold value. Exemplary embodiments of this invention may be coupled to a drill string and advantageously utilized to filter drilling fluid downhole. Such embodiments tend to advantageously improve the filtering efficiency and safety of drilling operations.

摘要翻译： 提供一种过滤器组件，其包括具有其中部署的至少一个过滤器的主流动通道和其中布置有旁路过滤器的二次流动通道。 过滤器组件还包括旁通阀组件，其构造成当流体压力分别高于和低于可调节的预定阈值时选择性地打开和关闭二次流动通道。 本发明的示例性实施例可以联接到钻柱并且有利地用于在井下过滤钻井液。 这样的实施例倾向于有利地提高钻井作业的过滤效率和安全性。