Magnetic Variation Services, LLC

Timothy William Gee

Stefan Maus

Alexander Michael Mitkus

Todd W Benson

Richard Kulavik

Marc Willerth

Jin Sun

Jarrod Shawn DeVerse

Jason Truman Rice

Kenneth Robert McCarthy

Ann Kamel Fitzgerald

Jeshurun Micaiah Chisholm

Qianlong Liu

Brian Eugene Stokeld

A method and system for geosteering may generate a misfit function using a spline function. The misfit function may be used to accurately map errors or differences between TVD-based measurement data for one or more reference wells and MD-based measurement data collected during drilling of a subject well, in order to accurately determine a stratigraphic location of the subject well.

Geosteering methods and systems for improved drilling performance

Stratigraphic analysis includes determining misfit values between stratigraphic vertical depth of an offset wellbore, SVDand measured depth of a subject wellbore. A likelihood that the target measured depth is equal to or within a tolerance of stratigraphic vertical depth of the subject wellbore, SVD, for sequences of stratigraphic vertical depth is calculated. A probability weighted average and an uncertainty that the target measured depth for the subject wellbore, TMD, is equal to or within a tolerance of stratigraphic vertical depth of the subject wellbore, is calculated. A continuous probability function over a range of measured depth that the target measured depth for the subject wellbore, TMD, is equal to or within a tolerance of stratigraphic vertical depth of the subject wellbore, SVD, is calculated. The likelihood, the probability weighted average, the uncertainty, and the continuous probability function are used to make drilling decisions

Determining the likelihood and uncertainty of the wellbore being at a particular stratigraphic vertical depth

Systems and methods for using stratigraphic heat maps to steer a well being drilled. Data from one or more offset wells can be provided to a computer system and used with data from a well being drilled to generate one or more stratigraphic heat maps during the drilling of the subject well. The stratigraphic heat maps can be displayed and used to determine the location of the wellbore relative to one or more geological formations, including one or more target formations or within a target formation. Based on the use of the heat maps and the location of the wellbore relative to a target, the drill plan can be adjusted or updated and/or one or more drilling parameters or operations may be adjusted to drill the wellbore, such as to drill the wellbore to the target or to maximize the length of the wellbore within a target zone.

Steering a wellbore using stratigraphic misfit heat maps

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Englewood, CO, United States of America

Timothy William Gee