Enhanced measurement of azimuthal dependence of subterranean parameters
AssigneePathFinder Energy Services, Inc.
InventorSamuel Mark Haugland
Life of this patent
Estimating the term…
Abstract
A method for estimating an azimuthal dependence of a parameter of a borehole using logging sensor measurements acquired as a function of azimuth of the logging sensors is provided. The method includes acquiring at least one logging sensor measurement and a corresponding azimuth from a downhole tool. The method further includes processing a convolution of the logging sensor measurement and corresponding azimuth with a predetermined window function to determine convolved logging sensor data for at least one azimuthal position. Certain embodiments of this invention may be advantageously utilized in LWD imaging applications to provide for superior image resolution and noise rejection as compared to prior art imaging techniques.
Claims38
A method for estimating an azimuthal dependence of a parameter of a borehole using logging sensor measurements acquired as a function of azimuth of said logging sensors, the method comprising:
- (a) rotating a downhole tool in a borehole, the tool including at least one logging sensor and at least one azimuth sensor, data from the logging sensor being operable to assist determination of a parameter of the borehole;
- (b) causing the at least one logging sensor and the at least one azimuth sensor to acquire at least one data pair, each data pair comprising a logging sensor measurement and a corresponding azimuth;
- (c) processing a convolution of selected data pairs with a predetermined window function to determine convolved logging sensor data for at least one azimuthal position.
A method for forming an image of a parameter of a borehole using logging sensor measurements acquired as a function of azimuth of said logging sensors, the method comprising:
- (a) rotating a downhole tool at a first longitudinal position in the borehole, the tool including at least one logging sensor and at least one azimuth sensor, data from the logging sensor being operable to assist determination of a parameter of the borehole;
- (b) causing the at least one logging sensor and the at least one azimuth sensor to acquire at least one data pair, each data pair comprising a logging sensor measurement and a corresponding azimuth;
- (c) processing a convolution of selected data pairs with a predetermined window function to determine convolved logging sensor data for at least one azimuthal position;
- (d) repositioning the downhole tool and rotating it at a second longitudinal position in the borehole and repeating (b) and (c).
A system for estimating an azimuthal dependence of a parameter of a borehole using logging sensor measurements acquired as a function of azimuth of said logging sensors, the system comprising:
- a downhole tool including at least one logging sensor and at least one azimuth sensor, data from the logging tool being operable to assist determination of a parameter of the borehole, the downhole tool further including a controller disposed to convolve logging sensor data with a predetermined window function, the downhole tool operable to be coupled to a drill string and rotated in a borehole;
- the controller configured to:
- (A) cause the at least one logging sensor and the at least one azimuth sensor to acquire at least one data pair, each data pair comprising a logging sensor measurement and a corresponding azimuth;
- and
- (B) process a convolution of selected data pairs with a predetermined window function to determine convolved logging sensor data for at least one azimuthal position.
A computer readable medium storing a software program, the software program configured to enable a processor to perform a method for estimating an azimuthal dependence of a parameter of a borehole using logging sensor measurements acquired as a function of azimuth of said logging sensors, the method comprising:
- (a) causing at least one logging sensor and at least one azimuth sensor deployed on a downhole tool to acquire at least one data pair, each data pair comprising a logging sensor measurement and a corresponding azimuth;
- (b) processing a convolution of selected data pairs with a predetermined window function to determine convolved logging sensor data for at least one azimuthal position.
Dependencies are inferred from the claim text.