Comprehensive method of processing measurement while drilling data from one or more sensors
AssigneeBaker Hughes Incorporated
InventorsRussel R. Randall, David M. Schneider, Mark W. Hutchinson, Steven L. Hobart
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Abstract
The present invention relates to the transformation of measurement while drilling (MWD) data acquired during various time intervals into corresponding equal depth intervals. Once the data are transformed into the depth domain, depth based statistical, filtering sensor resolution matching and depth shifting techniques are utilized. The transformation process maximizes sensor vertical resolution while minimizing observed and statistical errors associated with sensor response.
Claims35
A method for translating raw data acquired from a MWD system operating in a well borehole wherein the raw data are acquired at spaced time intervals and are translated onto corresponding evenly spaced depth intervals, the method comprising the steps of;
- (a) acquiring raw data in spaced time intervals using a sensor in a well borehole and comprising a part of a MWD system;
- (b) assigning to said raw data, depth values corresponding to the locations of acquisition;
- (c) placing said raw data onto a first evenly spaced depth grid;
- (d) positioning data onto points of said first depth grid by filtering said raw data using a first depth filter thereby creating a second data set;
- (e) for selected points of said first evenly spaced depth grid not containing data, providing data for said points by interpolating adjacent points of said first evenly spaced depth grid containing data;
- (f) applying a second filter, a deconvolution process or both to said second data set creating a third data set;
- (g) placing said third data set onto a second evenly spaced depth grid with spacing greater than said first evenly spaced depth grid;
- and
- (h) retaining elements of said third data set which fall upon the grid points of said second evenly spaced depth grid thereby creating a fourth data set.
A method for translating two or more raw data sets acquired with a MWD system operating in a well borehole where the raw data are acquired at spaced time intervals and are translated onto corresponding evenly spaced depth intervals, the method comprising the steps of;
- (a) acquiring, in timed intervals, sets of raw data from one or more sensors mounted within said MWD system;
- (b) assigning to said raw data in each set depth values corresponding to the locations of acquisition;
- (c) placing said raw data from each said set onto a first evenly spaced depth grid;
- (d) positioning data onto points of said first evenly spaced depth grid by filtering each said raw data set using a center weighted first filter thereby creating second data sets;
- (e) for any point of said first evenly spaced depth grid not containing data for a given second data set, filling said point for each given said second data set by interpolating adjacent points containing data within said given second set;
- (f) applying a second center weighted filter, a deconvolution process or both to each said second data set thereby removing any aliasing and thereby creating third data sets;
- (g) placing each of said third data sets onto a second evenly spaced depth grid with spacing an integer multiple of said first evenly spaced depth grid;
- and
- (h) retaining elements of each of said third data sets which fall upon the grid points of said second evenly spaced depth grid thereby creating forth data sets.
A system for acquiring and translating one or more raw data sets from at least one sensor in a MWD system operating in a borehole wherein the raw data are acquired at spaced time intervals and are translated onto corresponding evenly spaced depth intervals, comprising:
- (a) sensor means for a MWD system for acquiring said raw data from a well borehole;
- (b) means for receiving said raw data from said sensor or sensors;
- (c) means of assigning a depth value to each measured raw data value corresponding to the location of acquisition;
- (d) means for positioning each of said raw data sets onto a first evenly spaced depth grid;
- (e) means for positioning data onto points of said first evenly spaced depth grid by filtering said raw data sets using a center weighted first filter thereby creating second data sets;
- (f) for any point of said first evenly spaced depth grid not containing data for a given said second data set, means of filling said point for each given second data set by interpolating adjacent points containing data within said second data set;
- (g) means for applying a deconvolution process, a second center weighted filter, or both to each said second data set thereby removing any aliasing and thereby creating third data sets;
- (h) means for placing said third data sets onto a second evenly spaced depth grid with the spacing of said evenly spaced depth grid being an integer multiple of said first evenly spaced depth grid;
- (i) means for retaining elements of each said third data sets which fall upon a grid point of said second evenly spaced depth grid thereby creating a fourth data sets;
- and
- (j) means for recording said fourth data sets.
A method of translating raw data acquired from a MWD system operating in a well borehole wherein the raw data are acquired at spaced time intervals and are translated onto corresponding evenly spaced depth intervals, the method comprising the steps of:
- (a) acquiring raw data in spaced time intervals using a sensor in a well borehole and comprising a part of a MWD system;
- (b) assigning to said raw data, depth values corresponding to the locations of acquisition;
- (c) placing said raw data onto an evenly spaced depth grid;
- (d) positioning data onto points of said depth grid by filtering said raw data using a first depth filter thereby creating a second data set;
- (e) for selected points of said evenly spaced depth grid not containing data, providing data for said points by interpolating adjacent points of said evenly spaced depth grid containing data;
- and
- (f) applying a second filter to said second data set thereby creating a third data set.
A system for acquiring and translating raw data from at least one sensor in a MWD system operating in a well borehole wherein the raw data are acquired at spaced time intervals and are translated onto corresponding spaced depth intervals, comprising:
- (a) sensor means for a MWD system for acquiring said raw data from a well borehole;
- (b) means for receiving raw data from said sensor or sensors;
- (c) means for assigning a depth value to each measured raw data value corresponding to location of acquisition;
- (d) means of positioning raw data onto an evenly spaced grid;
- (e) means of positioning data onto points of said evenly spaced grid by filtering said raw data using a first center weighted depth filter thereby creating a second data set;
- (f) for any point of said evenly spaced depth grid not containing data for said second data set, means of filling said point by interpolating adjacent points containing data within said second set;
- (g).. means for applying a second center weighted depth filter to said second data set thereby removing any aliasing and thereby creating a third data set;
- and
- (h) means of recording said third data set.
Dependencies are inferred from the claim text.