Transferring logging data from an offset well location to a target well location
AssigneeLandmark Graphics Corporation
InventorsXinpu Shen, Guoyang Shen
Life of this patent
Estimating the term…
Abstract
Systems and methods for transferring logging data from an offset well location to a target well location by adjusting the logging data to account for the difference in correlated depths between the target well and the offset well where logging data is acquired.
Claims18
A computer-based method for transferring logging data from an offset well location to a target well location, which comprises:
- measuring true vertical depth (TVD) values for an offset well and a target well respectively;
- compiling a top-table by correlating each TVD measurement from the offset well with a respective TVD measurement for a predicted trajectory of the target well;
- calculating a normal compaction trend for the offset well using logging data for the offset well;
- calculating an inclination of the normal compaction trend using any two TVD measurements from the offset well and the respective logging data at the two TVD measurements;
- calculating a logging data ratio for the logging data at each respective TVD measurement from the offset well using the inclination, each TVD measurement from the offset well, each correlated TVD measurement for the target well from the top-table and a computer processor;
- transferring the logging data from the location of the offset well to the location of the target well by multiplying the logging data at each TVD measurement for the offset well by the logging data ratio for each respective TVD measurement from the offset well;
- and
- using the logging data transferred to the target well location to predict at least one of overburden stress, effective stress, and pore pressure along the predicted trajectory of the target well.
A non-transitory program carrier device tangibly carrying computer executable instructions for transferring logging data from an offset well location to a target well location, the instructions being executable to implement:
- measuring true vertical depth (TVD) values for an offset well and a target well respectively;
- compiling a top-table by correlating each TVD measurement from the offset well with a respective TVD measurement for a predicted trajectory of the target well;
- calculating a normal compaction trend for the offset well using logging data for the offset well;
- calculating an inclination of the normal compaction trend using any two TVD measurements from the offset well and the respective logging data at the two TVD measurements;
- calculating a logging data ratio for the logging data at each respective TVD measurement from the offset well using the inclination, each TVD measurement from the offset well, and each correlated TVD measurement for the target well from the top-table;
- transferring the logging data from the location of the offset well to the location of the target well by multiplying the logging data at each TVD measurement for the offset well by the logging data ratio for each respective TVD measurement from the offset well;
- and
- using the logging data transferred to the target well location to predict at least one of overburden stress, effective stress, and pore pressure along the predicted trajectory of the target well.
A non-transitory program carrier device tangibly carrying computer executable instructions for transferring logging data from an offset well location to a target well location, the instructions being executable to implement:
- measuring true vertical depth (TVD) values for an offset well and a target well respectively;
- compiling a top-table by correlating each TVD measurement from the offset well with a respective TVD measurement for a predicted trajectory of the target well;
- calculating an inclination of a normal compaction trend for the offset well using any two TVD measurements from the offset well and respective logging data for the offset well at the two TVD measurements;
- calculating a logging data ratio for the logging data at each respective TVD measurement from the offset well using the inclination, each TVD measurement from the offset well, and each correlated TVD measurement for the target well from the top-table;
- transferring the logging data from the location of the offset well to the location of the target well by multiplying the logging data at each TVD measurement for the offset well by the logging data ratio for each respective TVD measurement from the offset well;
- and
- using the logging data transferred to the target well location to predict at least one of overburden stress, effective stress, and pore pressure along the predicted trajectory of the target well.
Dependencies are inferred from the claim text.