Relationship of Drilling Mud Resistivity to Mud Filtrate Resistivity
Jan 1, 2014 · Sherborne and Newton investigated the relationship of mud resistivity to mudfiltrate resistivity and concluded that, "The resistivity of the mud inmost cases closely approximates that of its filtrate," and "In fact, with the exception of Aquagel and its filtrate, the figures for any particularmud and filtrate are almost identical."
Relationships Between the Mud Resistivity, Mud Filtrate Resistivity ...
An investigation was conducted on the resistivities of oil-emulsion muds, mud filtrates, and mud cakes to determine if these values conformed to the relationships for aqueous muds.
measurements of spontaneous potential and mud-filtrate resistivity to estimate the formation-water resistivity. The cross- plot method uses porosity values and observed resistivity of saturated rock to estimate the formation-water resistivity. Neither method was an accurate estimator. However, in areas
Formation resistivity determination - PetroWiki
Jun 25, 2015 · In a permeable formation, mud resistivity is commonly 1 to 3 orders of magnitude lower than the formation resistivity, or, in the case of oil-based mud (OBM), it can be much higher.
Dakota--Petrophysics 6--Resistivity Logs - University of Kansas
The replacement of formation water by mud filtrate involves a change of pore water resistivity. Figure 12. Spontaneous potential (SP) spherically focussed (SFL) medium- (ILM) and deep- (ILD) induction resistivity logs from KGS Jones #1.
Analysis of resistivity of mud, mud filtrate, and mud cake as …
There are two methods of determining the resistivity of mud filtrate and mud cake, one being direct measurement at surface temperature and the other the conversion of mud resistivity (R/sub m/) measured at surface temperature into resistivity of mud filtrate and mud cake using appropriate charts.
Analysis Of Resistivity Of Mud, Mud Filtrate And Mud Cake As
Every log analyst is aware that the resistivities of mud filtrate (Rmf) and mud cake (Rmc) are very important parameters involved in log interpretation. These go directly into the computation of formation water resistivity, water saturation in the flushed zone and porosity.
Modeling formation resistivity changes due to invasion and …
Oct 1, 2018 · Resistivity of mud filtrate and formation water at any formation temperature can be converted into equivalent NaCl concentration by combining two empirical relations: one that relates concentration of NaCl solutions with corresponding electrical resistivity at a specified temperate (75 ℉) (Worthington et al., 1990), and a second correlation ...
Mud filtrate invasion in formations results in separation of apparent resistivities with different investigation depths, which thereby can be used to qualitatively identify the...
[PDF] Relationship of Drilling Mud Resistivity to Mud Filtrate ...
s: The effect of salt contamination on the plastic viscosity and electrical resistivity of bentonite drilling mud (6% w/w) was investigated. The salt (NaCl) content in the mud was varied up to 0.3%. … Expand