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- W2905539729 abstract "Accurate characterization of the size and shape of the borehole is critical to the effective borehole correction for logging while drilling (LWD) measurements. It is also necessary for the real-time evaluation of geomechanical wellbore stability and for optimizing drilling operation and determining proper completion strategies. The pseudo-caliper measurement can be derived from LWD azimuthal density measurement, where a linear empirical model is employed to calculate the tool standoffs. However, we found that as the tool standoff continues to increase, the model could no longer describe the variation in borehole size accurately. In this paper, the responses of LWD azimuthal density measurement under different logging conditions are studied using the Monte Carlo modeling method. To improve the estimation of borehole geometry, a new model is proposed to determine tool standoffs and measure the borehole caliper. Simulation models with different degrees of borehole enlargement are built to investigate the performance of the model. Compared with the currently used method, the wellbore caliper values calculated using the new method are more consistent with the actual values. A field example with mechanical caliper measured from wireline logs is also presented to validate the effectiveness of the proposed method." @default.
- W2905539729 created "2018-12-22" @default.
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- W2905539729 date "2019-03-01" @default.
- W2905539729 modified "2023-10-16" @default.
- W2905539729 title "Improvement in the method for borehole caliper measurement based on azimuthal gamma-gamma density well logging" @default.
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- W2905539729 doi "https://doi.org/10.1016/j.apradiso.2018.12.014" @default.
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