Apparatus and methods for making azimuthal resistivity measurements

• US 9,767,153 B2
• Filed: 03/22/2017
• Issued: 09/19/2017
• Est. Priority Date: 06/12/2013
• Status: Expired due to Fees

• Current Assignee: Well Resolutions Technology
• Original Assignee: Well Resolutions Technology
• Inventors: Wang, Tsili
• Primary Examiner(s): LEDYNH, BOT L
• Application Number:
  US15/466,507
• Publication Number:
  US 20170193050A1
• Time in Patent Office: 181 Days
• Field of Search: 324333, 324339
• CPC Class Codes: E21B 17/1078 Stabilisers or centralisers for casing, tubing or drill pipes devices for off-center positioning E21B17/10; E21B17/1007 - E21B17/1064 take precedence
• CPC Class Codes: E21B 44/005 Below-ground automatic control systems
• CPC Class Codes: E21B 47/024 of devices in the borehole determining slope or direction of the borehole E21B47/022
• CPC Class Codes: E21B 47/09 Locating or determining the position of objects in boreholes or wells , e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
• CPC Class Codes: E21B 49/00 Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
• CPC Class Codes: E21B 7/062 the tool shaft rotating inside a non-rotating guide travelling with the shaft E21B7/067 and E21B7/068 take precedence
• CPC Class Codes: G01V 3/12 operating with electromagnetic waves operating with millimetre waves G01V8/005
• CPC Class Codes: G01V 3/26 operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device with electromagnetic waves G01V3/30
• CPC Class Codes: G01V 3/28 using induction coils
• CPC Class Codes: G01V 3/30 operating with electromagnetic waves
• CPC Class Codes: G01V 3/34 Transmitting data to recording or processing apparatus; Recording data
• CPC Class Codes: G06F 16/24554 Unary operations; Data partitioning operations
• CPC Class Codes: G06F 16/24578 using ranking

Abstract

A method of data binning includes the steps of partitioning a circumference of a tool face into M number of sectors, defining each data point relating to resistivity information by a fidelity function g(Φ), assigning to each data point a weight for each of the M number of sectors, wherein the weight is associated with an integral of the fidelity function g(Φ) over the sector, and computing an average of the data points weighted by their respective weights for each of the M sectors.

Claims

1. A method of data binning comprising:

partitioning a circumference of a tool face into M number of sectors;

defining each data point relating to resistivity information by a fidelity function g(Φ

);

assigning to each data point a weight for each of the M number of sectors, wherein the weight is associated with an integral of the fidelity function g(Φ

) over the sector; and

computing an average of the data points weighted by their respective weights for each of the M sectors.

2. A method of data binning comprising:

acquiring data at multiple tool face angles;

partitioning a circumference of the tool face into M number of sectors;

defining each data point relating to resistivity information by a fidelity function g(Φ

);

assigning to each data point a weight for each of the M number of sectors, wherein the weight is associated with an integral of the fidelity function g(Φ

) over the sector; and

computing an average of the data points weighted by their respective weights for each of the M sectors.

3. The method of claim 2, wherein acquired data is regularly distributed in a tool face domain.

4. The method of claim 2, wherein acquired data is irregularly distributed in a tool face domain.

5. The method of claim 2, wherein a rotation speed of the tool face is varied.

6. The method of claim 2, wherein a total of the M sectors are formed to cover the entire tool face angle range of 0°

to 360°

.

7. The method of claim 2, wherein a data point that resides close to a boundary between adjacent sectors contributes a value to binned values of both sectors.

8. The method of claim 7, wherein a data point that resides on the boundary between two adjacent sectors is split into the two adjacent sectors.

9. The method of claim 7, wherein a data point that resides within one sector but is within a range of uncertainty to the boundary is assigned to both adjacent sectors with different weights.

10. The method of claim 9, wherein the range of uncertainty is within at least one degree of the tool face angle.

11. The method of claim 9, wherein the range of uncertainty is within at least three degrees of the tool face angle.

12. The method of claim 9, wherein the range of uncertainty is within at least five degrees of the tool face angle.