System and method for determining BHA position during lateral drilling
A method for controlling drilling direction of a bore hole assembly (BHA) while laterally drilling through a formation involves accessing, by a surface steerable system, recent TVD corrected logging history data from a bore hole estimator, iteratively determining, by the surface steerable system, a formation bed dip of the formation being laterally drilled through, repeating the steps of accessing the recent TVD corrected logging history data and iteratively determining the formation bed dip of the formation responsive to additional well information, determining, by the surface steerable system, a most probable statistical match of a well bore positions to predicated well bore positions based on the accessed recent TVD corrected logging history data, the determined formation bed dip and the additional well information and providing, by the surface steerable system, geosteering feedback responsive to the determined most probable statistical match.
1. A control system for drilling, the control system comprising:
a processor having access to a memory media;
the memory media storing instructions executable by the processor for controlling drilling direction of a bore hole assembly (BHA) during lateral drilling by a drilling rig of a wellbore through a formation, the instructions further comprising instructions for:
accessing first logging data comprising logging data collected by the BHA over an evaluation length of the wellbore and corrected for true vertical depth (TVD) using a spatial path of the wellbore, wherein TVD represents a location with respect to both a vertical and horizontal axis;
determining a first bed dip of the formation by iteratively applying different values of bed dip to the first logging data to determine the first bed dip as a value of bed dip best matching with the first logging data;
determining a second bed dip by modifying the first bed dip based on drilling information collected during the lateral drilling, wherein the drilling information comprises at least one of: second logging data different from the first logging data, mud analysis data, and drilling equipment data;
estimating a subterranean location of the BHA based on the first logging data, the second bed dip, and the drilling information, wherein the subterranean location is the location of the BHA with respect to both a vertical and horizontal axis; and
using the subterranean location to modify steering of the lateral drilling of the wellbore.
2. The control system of claim 1 , wherein the first logging data comprise gamma radiation logging data.
3. The control system of claim 1 , wherein the spatial path of the wellbore is received from a bore hole estimator (BHE).
4. The control system of claim 3 , further comprising instructions for:
receiving inclination angle measurements and azimuth angle measurements from the BHA; and
enabling the BHE to use the inclination angle measurements and azimuth angle measurements to estimate the spatial path of the wellbore.
5. The control system of claim 1 , wherein the instructions for determining the first bed dip by iteratively applying different values of bed dip to the first logging data further comprise instructions for:
iterating the values of bed dip in 0.01 degree increments.
6. The control system of claim 1 , wherein the drilling equipment data includes at least one of: rate of penetration (ROP), weight on bit (WOB), build rate, and rotary build tendency.
7. The control system of claim 1 , wherein the instructions for using the subterranean location to modify steering of the lateral drilling further comprise instructions for:
adjusting a drilling target of the wellbore.
8. The control system of claim 1 , wherein the instructions for accessing the first logging data further comprise instructions for:
receiving user input specifying the evaluation length.
9. The control system of claim 1 , wherein the instructions for accessing the first logging data and determining the first bed dip further comprise instructions for:
varying the evaluation length to determine the first bed dip.
10. The control system of claim 1 , wherein the instructions for accessing the first logging data further comprise instructions for:
defining the evaluation length based on predetermined inflection points in the logging data collected by the BHA.
11. A method for drilling, the method comprising:
controlling drilling direction of a bore hole assembly (BHA) during lateral drilling by a drilling rig of a wellbore through a formation by a surface steerable control system, further comprising:
accessing first logging data comprising logging data collected by the BHA over an evaluation length of the wellbore and corrected for true vertical depth (TVD) using a spatial path of the wellbore, wherein TVD represents a location with respect to both a vertical and horizontal axis;
determining a first bed dip of the formation by iteratively applying different values of bed dip to the first logging data to determine the first bed dip as a value of bed dip best matching with the first logging data;
determining a second bed dip by modifying the first bed dip based on drilling information collected during the lateral drilling by the surface steerable control system, wherein the drilling information comprises at least one of: second logging data different from the first logging data, mud analysis data, and drilling equipment data;
estimating a subterranean location of the BHA based on the first logging data, the second bed dip, and the drilling information, wherein the subterranean location is the location of the BHA with respect to both a vertical and horizontal axis; and
using the subterranean location to modify steering of the lateral drilling of the wellbore by the surface steerable control system.
12. The method of claim 11 , wherein the first logging data comprise gamma radiation logging data.
13. The method of claim 11 , wherein the spatial path of the wellbore is received from a bore hole estimator (BHE).
14. The method of claim 13 , further comprising:
receiving inclination angle measurements and azimuth angle measurements from the BHA; and
enabling the BHE to use the inclination angle measurements and azimuth angle measurements to estimate the spatial path of the wellbore.
15. The method of claim 11 , wherein determining the first bed dip by iteratively applying different values of bed dip to the first logging data further comprises:
iterating the values of bed dip in 0.01 degree increments.
16. The method of claim 11 , wherein the drilling equipment data includes at least one of: rate of penetration (ROP), weight on bit (WOB), build rate, and rotary build tendency.
17. The method of claim 11 , wherein using the subterranean location to modify steering of the lateral drilling further comprises:
adjusting a drilling target of the wellbore.
18. The method of claim 11 , wherein accessing the first logging data further comprises:
receiving user input specifying the evaluation length.
19. The method of claim 11 , wherein accessing the first logging data and determining the first bed dip further comprises:
varying the evaluation length to determine the first bed dip.
20. The method of claim 11 , wherein accessing the first logging data further comprises:
defining the evaluation length based on predetermined inflection points in the logging data collected by the BHA.