Schlumberger Technology Corporation

Wellworc, Inc.

David P Smith

Scott A Grubb

Bruce E Smith

Michael B Smith

Sarmad Adnan

L Michael McKee

Michael Hayes Kenison

Zhanke Liu

Robert Bucher

Mirjam Zwanenburg

Michelle Torregrossa

Liam Zsolt

Embodiments of this disclosure confirm a leak and determine a depth of the leak in a well of a drilling system. The drilling system include a circulating fluid and a fluid caliper having a density contrast relative to a density of the circulating fluid. Fluid mass flow and fluid density data are continually collected by an inlet and outlet side flow measurements. A measured surface pressure, a measured downhole pressure, a user-defined managed depth window, and a target equivalent circulating density at the user-defined managed depth window are inputted to a microprocessor. The microprocessor adjusts the fluid density data for temperature and pressure; calculates a mass flow balance and a wellbore pressure; compares the measured density and mass flow in with the measured density and mass flow out; and determines, based upon the comparing, the presence of the leak and the depth of the leak.

Real time flow analysis methods and continuous mass balance and wellbore pressure calculations from real-time density and flow measurements

Embodiments of a system and method of this disclosure continually determine a mass balance of a drilling or circulating system, using mass flow and density data adjusted for temperature and pressure. The system and method may be used to continually monitor and control wellbore pressures to achieve over-balanced managed pressure drilling ('MPD'). In some embodiments, the system and method may be used as a fluid tracking engine. In other embodiments, the system and method may be used to accurately track a fluid caliper intended to survey the well to determine string volumes or borehole volumes; an example is determining the volume of cement needed to circulate the cement or bring the cement up to desired height. The system and method may be used to track the effects of mixing. The system and method may also be used as a viscometer.

A technique facilitates monitoring of pipe, such as coiled tubing. The monitoring may be used to detect conditions which occur within the pipe itself or in components employed along an interior of the pipe. A magnetic sensor system is positioned along an exterior of the pipe, e.g. coiled tubing. During relative movement between the pipe and the magnetic sensor system, the magnetic sensor system monitors for the condition, e.g. change/abnormality, of interest. In some applications, the magnetic sensor system is used to monitor changes in a physical property of the pipe, and/or a component within the pipe, during a succession of operations employing the pipe.

Monitoring pipe conditions

A technique provides an orientation system combined with downhole equipment used in a well. An orientation device is mounted in the downhole equipment, e.g. a bottom hole assembly, for actuation during angular displacement of the downhole equipment. A sensor is mounted to cooperate with the orientation device in detecting the angular displacement.

System and method for measuring an orientation of a downhole tool

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Anchorage, AK, United States of America

David P Smith