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Line 17: − + − + − ! Minimum Hole Size (in.)+ − ! Maximum Hole Size (in.)+ − − ! S − ! B − ! K − ! O − ! Excentered − ! Stand-Off (in.) − ! Centered − ! Recommended logging speed (ft/hr) Line 267:
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{| class = "wikitable"
{| class = "wikitable"
|-
|-
|+ {{table number|1}}Basic tool table
|+ {{table number|1}}Basic tool table<sup>a</sup>
|-
|-
! Tool
! rowspan=2 | Tool || rowspan=2 | Minimum Hole Size (in.) || rowspan=2 | Maximum Hole Size (in.) || colspan=5 | Mud Type<sup>b</sup> || colspan=3 | Preferred Hole Positions || rowspan=2 | ! Recommended logging speed (ft/hr)
|-
! F || S || B || K || O || Excentered || Stand-Off (in.) || Centered
! F
|-
|-
| [[Basic open hole tools#Spontaneous potential|SP]]
| [[Basic open hole tools#Spontaneous potential|SP]]
|}
|}
<sup>a</sup><sub>Symbols: √ = good conditions, × = unsuitable conditions, - = marginally acceptable conditions, NR = not recommended, NA = not applicable, M = with special modifications.</sub><br>
<sup>b</sup><sub>Mud types: F = freshwater (low salt), S = high salt, B = barite, K = high potassium salt, O = oil-based.</sub>
Computerized surface systems and cable communication systems have made tool combinations virtually unlimited. However, the combining of different tools into a single logging run may be limited by more than the physical ability to hook them together. Some devices are designed to operate excentered, some centered, and some stood off from the borehole wall. Tool positioning is important in ensuring valid environmental corrections. Table 1 includes optimum hole positions for each device. Caution should be used in combining a tool designed to be excentered, such as the neutron, with one designed to be centered, such as the sonic. The environmental effects upon the measurement may be uncorrectable. Also note that the maximum and minimum hole sizes are general recommendations only. Some logging devices are modified for larger and smaller holes.
Computerized surface systems and cable communication systems have made tool combinations virtually unlimited. However, the combining of different tools into a single logging run may be limited by more than the physical ability to hook them together. Some devices are designed to operate excentered, some centered, and some stood off from the borehole wall. Tool positioning is important in ensuring valid environmental corrections. Table 1 includes optimum hole positions for each device. Caution should be used in combining a tool designed to be excentered, such as the neutron, with one designed to be centered, such as the sonic. The environmental effects upon the measurement may be uncorrectable. Also note that the maximum and minimum hole sizes are general recommendations only. Some logging devices are modified for larger and smaller holes.