US2015315904A1PendingUtilityA1
Integrated Wellbore Caliper
Assignee: SCHLUMBERGER TECHNOLOGY CORPPriority: Dec 28, 2012Filed: Dec 17, 2013Published: Nov 5, 2015
Est. expiryDec 28, 2032(~6.4 yrs left)· nominal 20-yr term from priority
Inventors:Mauro Manclossi
E21B 47/082E21B 47/08E21B 47/085
37
PatentIndex Score
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Claims
Abstract
Systems and methods are provided for an integrated caliper measurement obtained based on caliper measurements from at least two downhole tools. In one example, a system for obtaining such an integrated caliper includes several caliper tools and data processing circuitry. The caliper tools may respectively obtain caliper measurements of a wellbore. The data processing circuitry may assign respective weights to the respective caliper measurements and combine the weighted caliper measurements to obtain an integrated caliper measurement. The confidence factors may be determined based at least partly on at least two of a plurality of weighting functions. These weighting functions may each relate a confidence of the caliper measurements to an environmental or drilling characteristic occurring when the caliber measurements are obtained.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A system comprising:
a plurality of caliper tools configured to obtain respective caliper measurements of a wellbore; and data processing circuitry configured to assign respective confidence factors to weight the respective caliper measurements and combine the weighted caliper measurements to obtain an integrated caliper measurement, wherein the confidence factors are determined based at least partly on at least two of a plurality of weighting functions that each relate a confidence of the caliper measurements to an environmental or drilling characteristic occurring when the caliber measurements are obtained.
2 . The system of claim 1 , wherein the plurality of caliper tools comprises an ultrasonic caliper tool configured to obtain an ultrasonic caliper.
3 . The system of claim 1 , wherein the plurality of caliper tools comprises a gamma density tool configured to obtain a density-derived caliper.
4 . The system of claim 1 , wherein the plurality of caliper tools comprises three or more caliper tools that provide three or more respective caliper measurements.
5 . The system of claim 1 , wherein the data processing circuitry is configured to assign the respective confidence factors to the respective caliper measurements based at least in part on a characteristic of drilling fluid in the wellbore.
6 . The system of claim 5 , wherein the characteristic of the drilling fluid in the wellbore comprises a mud weight of the drilling fluid, a mud type of the drilling fluid, a mud slowness of the drilling fluid, or a photoelectric factor associated with the drilling fluid, or any combination thereof.
7 . The system of claim 1 , wherein the data processing circuitry is configured to assign the respective confidence factors to the respective caliper measurements based at least in part on a characteristic of operation of a drill string that houses the plurality of caliper tools.
8 . The system of claim 7 , wherein the characteristic of operation of the drill string comprises a rotation speed of the drill string, an amount of eccentering of the drill string in the wellbore, or a rate of penetration of the drill string in the wellbore, or any combination thereof.
9 . The system of claim 1 , wherein the data processing circuitry is configured to assign the respective confidence factors to the respective caliper measurements based at least in part on a condition of the wellbore or of a drill string that houses the plurality of caliper tools, wherein the condition is configured to be input by a human operator of the system.
10 . The system of claim 1 , comprising at least one other tool configured to ascertain a condition of the wellbore or of a drill string that houses the plurality of caliper tools, wherein the data processing circuitry is configured to assign the respective weights to the respective caliper measurements based at least in part on the condition of the wellbore.
11 . One or more tangible non-transitory machine-readable media storing instructions to:
receive a first caliper measurement deriving from a first downhole tool; receive a second caliper measurement deriving from a second downhole tool; receive a plurality of conditions under which the first downhole tool obtained the first caliper measurement and under which the second downhole tool obtained the second caliper measurement; determine a first confidence factor representing a degree of confidence that the first caliper measurement is accurate based at least in part on a plurality of weighting factors each associated with one of the plurality of conditions; determine a second confidence factor representing a degree of confidence that the second caliper measurement is accurate based at least in part on a plurality of weighting factors each associated with one of the plurality of conditions; and determine an integrated caliper measurement using the first caliper measurement, the first confidence factor, the second caliper measurement, and the second confidence factor.
12 . The machine-readable media of claim 11 , wherein:
the instructions to determine the first confidence factor comprise instructions to determine a first plurality of weight factors each relating to a response of the first downhole tool to at least two of the plurality of conditions and determine the first confidence factor based at least in part on the first plurality of weight factors; and the instructions to determine the second confidence factor comprise instructions to determine a second plurality of weight factors each relating to a response of the second downhole tool to at least two of the plurality of conditions and determine the second confidence factor based at least in part on the second plurality of weight factors.
13 . The machine-readable media of claim 12 , wherein:
the instructions to determine the first confidence factor comprise instructions to multiply the first plurality of weight factors together, wherein each of the first plurality of weight factors represents a value between 0 and 1; and the instructions to determine the second confidence factor comprise instructions to multiply the second plurality of weight factors together, wherein each of the second plurality of weight factors represents a value between 0 and 1.
14 . The machine-readable media of claim 11 , wherein the instructions to determine the integrated caliper measurement comprise instructions to weight the first caliper measurement based on a relationship between the first confidence factor to the second confidence factor and to weight the second caliper measurement based on a relationship between the second confidence factor to the first confidence factor.
15 . The machine-readable media of claim 11 , wherein the instructions to determine the integrated caliper measurement accord with the following relationships:
I
C
A
L
=
ndcqf
·
D
C
A
V
+
nucqf
·
U
C
A
V
;
ndcqf
=
D
C
Q
F
D
C
Q
F
+
U
C
Q
F
;
and
nucqf
=
U
C
Q
F
D
C
Q
F
+
U
C
Q
F
;
where ICAL represents the integrated caliper measurement, DCAV represents the first caliper measurement, UCAV represents the second caliper measurement, DCQF represents the first confidence factor, and UCQF represents the second confidence factor.
16 . The machine-readable media of claim 11 , comprising instructions to determine a confidence factor of the integrated caliper measurement in accordance with the following relationships:
I
C
Q
F
=
ndcqf
·
D
C
Q
F
+
nucqf
·
U
C
Q
F
;
ndcqf
=
D
C
Q
F
D
C
Q
F
+
U
C
Q
F
;
and
nucqf
=
U
C
Q
F
D
C
Q
F
+
U
C
Q
F
;
where ICQF represents the confidence factor of the integrated caliper measurement, DCQF represents the first confidence factor, and UCQF represents the second confidence factor.Join the waitlist — get patent alerts
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