Changes

==Controlling RFT quality==

==Controlling RFT quality==

The table below describes how to control RFT quality. For details, see Gunter & Moore.<ref name=ch05r9 />

The list below describes how to control RFT quality. For details, see Gunter & Moore.<ref name=ch05r9 />

# Inspect the tool and check calibration before going in the hole.

# Run quartz and strain gauges simultaneously. Record both readings independently. Normalize to one another after completing the survey.

# Maintain a slight overflow of mud to keep the level in the borehole constant during the survey and to prevent mud hydrostatic pressure errors.

# Take mud hydrostatic pressures while descending into the hole to give the instruments time to equilibrate to changing temperature and pressure and to provide a mud hydrostatic pressure profile.

| 1 || Inspect the tool and check calibration before going in the hole.

# Check for tool errors by calculating mud hydrostatic pressures at different depths from mud weight; check them against measured mud hydrostatic pressures at the same depths.

| 2 || Run quartz and strain gauges simultaneously. Record both readings independently. Normalize to one another after completing the survey.

| 3 || Maintain a slight overflow of mud to keep the level in the borehole constant during the survey and to prevent mud hydrostatic pressure errors.

| 4 || Take mud hydrostatic pressures while descending into the hole to give the instruments time to equilibrate to changing temperature and pressure and to provide a mud hydrostatic pressure profile.

| 5 || Check for tool errors by calculating mud hydrostatic pressures at different depths from mud weight; check them against measured mud hydrostatic pressures at the same depths.

==See also==

==See also==