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Use the procedure outlined in the table below to estimate formation water density at reservoir conditions using R<sub>w</sub>. The approximate error is ±10% (after <ref name=ch05r4 />).
 
Use the procedure outlined in the table below to estimate formation water density at reservoir conditions using R<sub>w</sub>. The approximate error is ±10% (after <ref name=ch05r4 />).
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# Gather data: formation temperature (T<sub>f</sub> ), water resistivity (R<sub>w</sub> ), and formation pressure. Estimate pressure by multiplying depth by 0.433 psi/ft or other appropriate gradient. Check for T<sub>f</sub> errors.
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# Estimate sodium chloride (NaCl) concentration from R using Figure 5-5.
! Step
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# Estimate density from wt % NaCl and temperature using Figure 5-6.
! Action
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| Gather data: formation temperature (T<sub>f</sub> ), water resistivity (R<sub>w</sub> ), and formation pressure. Estimate pressure by multiplying depth by 0.433 psi/ft or other appropriate gradient. Check for T<sub>f</sub> errors.
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| 2
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| Estimate sodium chloride (NaCl) concentration from R using Figure 5-5.
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| 3
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| Estimate density from wt % NaCl and temperature using Figure 5-6.
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|}
      
==Gather data==
 
==Gather data==

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