Schlumberger Technology Corporation

John James

John C Rasmus

William Lesso

Richard John Meehan

Clinton Dane Chapman

Mbaga Louis Ahorukomeye

Edward M Tollefsen

Jonathan Guidry

Joseph Fang

Vincent Bricout

Scott Paul

Jim Belaskie

Amanda L Weber

Amr Khairy Mohamed Ahmed Essawi

Marcus Turner

A method for evaluating inflow or outflow in a subterranean wellbore includes acquiring first and second axially spaced pressure measurements in the wellbore. The pressure measurements may then be processed to obtain an interval density of drilling fluid between the measurement locations. A tool string including a large number of axially spaced pressure sensors (e.g., four or more or even six or more) electronically coupled with a surface processor via wired drill pipe may be used to obtain a plurality of interval densities corresponding to various wellbore intervals. The interval density may be measured during static conditions or while drilling and may be further processed to compute a density of an inflow constituent in the annulus. Changes in the computed interval density with time may be used as an indicator of either an inflow event or an outflow event.

Methods for evaluating inflow and outflow in a subterraean wellbore

A method for estimating equivalent top of fluid level or a theoretical surface annular back pressure in a subterranean wellbore includes acquiring first and second axially spaced pressure measurements in the wellbore. The pressure measurements may then be processed to compute the equivalent top of fluid level and/or theoretical surface annular back pressure of drilling fluid between the measurement locations. A tool string including a large number of axially spaced pressure sensors (e.g., four or more or even six or more) electronically coupled with a surface processor via wired drill pipe may be used to obtain a plurality of values corresponding to various wellbore intervals. The equivalent top of fluid level and/or theoretical surface annular back pressures may be used in automated managed pressure drilling operations.

Interval density pressure management methods

A method identifying a wellbore volume change while drilling a subterranean wellbore includes acquiring first and second axially spaced pressure measurements in the wellbore. The wellbore volume change may include, for example, a borehole washout or a borehole pack-off. The pressure measurements may then be processed to obtain an interval density of drilling fluid between the measurement locations. A tool string including a large number of axially spaced pressure sensors (e.g., four or more or even six or more) electronically coupled with a surface processor via wired drill pipe may be used to obtain a plurality of interval densities corresponding to various wellbore intervals. The interval densities may be measured while drilling and may be further evaluated as an indicator of a wellbore volume change.

Methods for evaluating borehole volume changes while drilling

Methods for evaluating inflow and outflow in a subterranean wellbore

A method evaluating a cuttings density while drilling a subterranean wellbore includes acquiring first and second axially spaced pressure measurements in the wellbore. The pressure measurements may then be processed to obtain an interval density of drilling fluid between the measurement locations. A tool string including a large number of axially spaced pressure sensors (e.g., four or more or even six or more) electronically coupled with a surface processor via wired drill pipe may be used to obtain a plurality of interval densities corresponding to various wellbore intervals. The interval density may be measured while drilling and may be further processed to compute a cuttings density in the annulus. Moreover, changes in the computed interval density with time while drilling may be used as an indicator of a change in cuttings density.

Methods for evaluating cuttings density while drilling

A system and a method determine movement of a drilling component, such as, for example, a tool, a drill bit or other wellbore device, within a wellbore. The system and method may process information obtained from the wellbore by using, for example, a numerical processing algorithm. The information may be data acquired during drilling of the wellbore. Rig surface data recording systems may track the position of the drill bit, the BHA and/or other component of the drill string during the time the component is within the wellbore. Downhole measuring devices may record data at various positions along the BHA and above the drill bit as a function of time.

System and method for determining movement of a drilling component in a wellbore

A method of determining a particular value on a display, comprises the steps of: moving a time log relative to a time line until the time line identifies a selected time on the time log; moving a plurality of values on the display in synchronism with the moving of the time log relative to the time line; and identifying one of the plurality of values on the display when the time line identifies the selected time on the time log, the one of the plurality of values on the display representing the particular value. The particular value on the display comprises a depth on a depth log representing a depth of a drill bit in a borehole. The depth log moves in synchronism with a movement of the time log when the time log moves relative to the time line.

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Houston, TX, United States of America

John James