Measurement-while-drilling assembly using real-time toolface oriented measurements
First Claim
1. A rotatable downhole assembly adapted for conveying in a borehole and determining a parameter of interest of a medium proximate to the borehole, the downhole assembly comprising:
- (a) a navigation assembly which provides a measurement indicative of toolface angle of the downhole assembly, said navigation assembly associated with a first processor;
(b) a directional evaluation device which provides measurements indicative of the parameter of interest, said directional evaluation device associated with a second processor; and
(c) a common bus operatively connected to the first processor and the second processor.
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Accused Products
Abstract
This invention provides a measurement-while-drilling (MWD) downhole assembly for use in drilling boreholes which utilizes directional formation evaluation devices on a rotating assembly in conjunction with toolface orientation sensors. The data from the toolface orientation sensors are analyzed by a processor and toolface angle measurements are determined at defined intervals. Formation evaluation sensors operate substantially independently of the toolface orientation sensors and measurements of the formation evaluation sensors are analyzed in combination with the determined toolface angle to obtain formation parameters.
61 Citations
33 Claims
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1. A rotatable downhole assembly adapted for conveying in a borehole and determining a parameter of interest of a medium proximate to the borehole, the downhole assembly comprising:
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(a) a navigation assembly which provides a measurement indicative of toolface angle of the downhole assembly, said navigation assembly associated with a first processor; (b) a directional evaluation device which provides measurements indicative of the parameter of interest, said directional evaluation device associated with a second processor; and (c) a common bus operatively connected to the first processor and the second processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of determining a parameter of interest of a medium proximate to a borehole using a rotating assembly in said borehole, the method comprising:
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(a) obtaining information about a tool-face angle of the assembly during rotation thereof; (b) using a directionally sensitive evaluation device for obtaining measurements indicative of the parameter of interest, said measurements being obtained separately over a plurality of specified time intervals; (c) determining from said obtained information and said measurements of the directionally sensitive evaluation device, partially processed measurements indicative of the parameter of interest over a plurality of sectors of said tool face angle; and (d) approximating said partially processed measurements by a series expansion that includes a sinusoidal variation with said tool face angle. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of obtaining a processed image of a borehole in an earth formation using a rotating downhole assembly in said borehole, the method comprising:
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(a) obtaining information about a tool-face angle of the assembly during rotation thereof; (b) using a directionally sensitive evaluation device for obtaining measurements indicative of a property of said earth formation at a plurality of tool-face angles; (c) repeating (a) and (b) at a plurality of different times and obtaining a raw data set; (d) fitting said raw data set at each of said plurality of different times with a fitting function to obtain a partially processed data set; (e) applying a low pass filter to said partially processed data set at each of said plurality of tool-face angles and defining a fully processed data set; and (f) displaying said fully processed data set as an image. - View Dependent Claims (32, 33)
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Specification