公开(公告)号：US20180291728A1

公开(公告)日：2018-10-11

申请号：US15765476

申请日：2016-09-30

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Oney ERGE ,  Ines DE MATA CECILIO ,  Richard DEARDEN ,  Jonathan DUNLOP ,  Walter David ALDRED ,  Ashley Bernard JOHNSON ,  lead REZEK ,  Benjamin Peter JEFFRYES

IPC: E21B47/10 ,  E21B21/08 ,  E21B47/06 ,  G06N7/00

Abstract: A method for detecting an influx and/or loss of circulation in a wellbore, comprising measuring a condition in the wellbore using a downhole sensor; determining that a positive displacement pump is shut off or turned on; predicting pit volume and/or gas concentration at a plurality of time points after the positive displacement pump is shut off or turned on using the measured condition in the wellbore prior to the positive displacement pump is shut off or turned on, wherein the measured condition correlates with the pit volume and/or gas concentration; measuring pit volume and/or gas concentration at the plurality of time points; comparing the predicted and the measured pit volumes and/or gas concentrations at the plurality of time points; and producing a warning signal if the difference between the predicted and the measured pit volumes and/or gas concentrations is greater than a pre determined value.

公开(公告)号：US20210062636A1

公开(公告)日：2021-03-04

申请号：US16644454

申请日：2018-09-04

Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

Inventor： Benjamin Peter JEFFRYES ,  Nathaniel WICKS ,  Shunfeng ZHENG

IPC: E21B44/04 ,  E21B3/02

Abstract: Methods and apparatus for controlling drill string rotation. The apparatus may be a control system for controlling a driver operable to rotate a drill string to form a wellbore extending into a subterranean formation. The control system may include a first controller operable to control rotation of the driver and a second controller communicatively connected with the first controller. During the drilling operations the first and/or second controller may be operable to generate a rotational speed command based on status information indicative of operational status of the drill string, and thereby cause the driver to rotate the drill string based on the rotational speed command

公开(公告)号：US20190391604A1

公开(公告)日：2019-12-26

申请号：US16564936

申请日：2019-09-09

Applicant: Schlumberger Technology Corporation

Inventor： Benjamin Peter JEFFRYES ,  John Cook ,  Steven Antony Gahlings

IPC: G05D19/02 ,  E21B47/00 ,  E21B44/00 ,  E21B43/12 ,  G05B15/02

Abstract: A method for changing a set point of a system where period of a dominant resonance of the system is determined, a change profile for the set point change is processed; a time period for the set point change based on the period of the dominant resonance in order to minimize excitation of the dominant resonance is also processed; and the set point change is actioned according to the processed change profile and the time period.