Resistivities of Mud (Rm), Mudcake (Rmc) and Mud Filtrate (Rmf)?

[yasiobasio123]

Hi Friends,

If we don't have the Log Header, how can we find Resistivities of Mud (Rm), Mudcake (Rmc) and Mud Filtrate (Rmf)?

Thanks..

[geologist_wael]

If You do NOT HAVE THE HEADER :
MAKE FOLLOW
1 - To determine the Rm : Select any interval which has big washout, then read the value of MSFL in this case the value of MSFL consider the value of RM.
2- To determine the Rmf : from the following equation Rmf = Km (Rm)^1.07 Where K Varying Between 0.847 - 0.35 for Mud Weigh 10-18 Where
Mud Weight (lbm/gal) or PPG---------------------------- Km
10 ----------------------------------------------------- 0.847
11 ----------------------------------------------------- 0.708
12 ----------------------------------------------------- 0.584
13 ----------------------------------------------------- 0.488
14 ----------------------------------------------------- 0.412
16 ------------------------------------------------------ 0.380
18 ------------------------------------------------------ 0.350

3- To determine Rmc from the following Equation :
Rmc = 0.69 Rmf (Rm/Rmf)^2.65

[edisonnadeak]

If You do NOT HAVE THE HEADER :
MAKE FOLLOW
1 - To determine the Rm : Select any interval which has big washout, then read the value of MSFL in this case the value of MSFL consider the value of RM.
2- To determine the Rmf : from the following equation Rmf = Km (Rm)^1.07 Where K Varying Between 0.847 - 0.35 for Mud Weigh 10-18 Where
Mud Weight (lbm/gal) or PPG---------------------------- Km
10 ----------------------------------------------------- 0.847
11 ----------------------------------------------------- 0.708
12 ----------------------------------------------------- 0.584
13 ----------------------------------------------------- 0.488
14 ----------------------------------------------------- 0.412
16 ------------------------------------------------------ 0.380
18 ------------------------------------------------------ 0.350

3- To determine Rmc from the following Equation :
Rmc = 0.69 Rmf (Rm/Rmf)^2.65

Just adding 1 point : We should determine the temperature at the washout interval first. We could found the wellfile record for found the information about drilling fluid using for that well.

[colmeseks]

thank for the information, it's helping me so much