Characteristics of nuclear LWD density measurements in elliptical boreholes - a modeling study
The effect of tool rotation on the density porosity predicted in elliptical boreholes by a nuclear logging-while-drilling density (LWD) measurement is studied using Monte Carlo modeling techniques. Laboratory calibration of such borehole conditions would be difficult. The response of a dual-detector device is calculated by rotating the sonde in the elliptical hole and associated porosity corrections are computed by two averaging procedures, one over the entire borehole and the other over the quadrant of closest contact. An equivalent circular borehole procedure to represent the rotation in elliptical holes is then postulated and successfully tested in the Monte Carlo model to eliminate the large number of CPU-intensive direct Monte Carlo simulations that were found necessary in the elliptical well bore configuration.
- OSTI ID:
- 471927
- Report Number(s):
- CONF-961003-; TRN: 96:006579-0048
- Resource Relation:
- Conference: 71. annual technical conference and exhibition of the Society of Petroleum Engineers, Denver, CO (United States), 6-9 Oct 1996; Other Information: PBD: 1996; Related Information: Is Part Of 1996 SPE annual technical conference and exhibition: Formation evaluation and reservoir geology; PB: 960 p.
- Country of Publication:
- United States
- Language:
- English
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