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...number|1}}Resistivity profiles of formations with fresh and saltwater mud filtrate invasion.]] ...1]] shows resistivity profiles of formations with fresh and saltwater mud filtrate invasion.

* Resistivity of the mud filtrate (R_mf) at measured temperature, found on the log header. If only ...and follow the procedure below to convert R_mf to equivalent mud filtrate resistivity (R_mf _eq).

...be mud filtrate. Proper analysis of the sample involves discriminating the filtrate from the native formation fluids.

...formation water samples, if available, are invariably contaminated by mud filtrate. ''R''_w is therefore usually calculated, and there are three met ...sub>mfe</sub>. Thus, the standard equation that relates the SSP to the mud filtrate and uninvaded formation water resistivities is

* Filtrate invasion ===Filtrate invasion===

...which due to their ability to hold a limited volume, usually recover only filtrate. (For more on formation testers, see [[Wireline formation testers]].)

.... This causes a zone with a good gas show when drilled to recover only mud filtrate or to appear water saturated when later tested or electric logged. In zones * Mud filtrate (water loss) amount

...''R''_w) reaches 1.0 or more. If there is no contrast in the mud filtrate and formation water salinities, there is no measurable SP. A typical presen ...asurements are usually unfavorably influenced by nonconductive mud and mud filtrate. The presentation of the dual laterolog is very similar to the presentation

...ikely to take place in permeable zones where there is a finite flow of mud filtrate into the formation.

...ub>rw</sub> ≈ 0). The '''imbibition curve''' relates to performance due to filtrate invasion from water injection or flushing from natural water drive.

...most likely corresponds to a streaming potential effect resulting from mud filtrate into the fractures.

...fluid saturating the rock immediately surrounding the borehole—usually mud filtrate (use 1.0 for freshwater and 1.1 for saltwater mud)

...of the reasons that could cause skin damage is invasion caused by the mud filtrate and cement fluid loss. To improve the productivity, the perforation length

...The initial flow period of 3-5 min removes the “supercharge” effect of mud filtrate near wellbore. The first buildup is run for 60 min to determine a valid ''P ...off into the target zone and doping the mud with nitrates will distinguish filtrate from recovered formation water.

...in wells generate the following data: the resistivity of the wellbore mud filtrate = 0.165 ohm-m resistivity of water = 0.18 ohm-m, the resistivity of the zon #* Saturation of mud filtrate in the washing zone are:

...that are not addressed by charts. Since the SP responds in part to the mud filtrate resistivity, no two SP curves will be recorded under exactly the same envir

| Problems with filtrate recovery on DST and RFT

...he [[drilling fluid]], severe formation damage can occur. The drilling mud filtrate penetrates the reservoir, causing swelling and [[hydrocarbon migration|migr

...ithout thermal effect), BHT is the bottom hole temperature, Rmf is the mud filtrate resistivity, SP is the spontaneous potential log reading, F is the formatio

The SP can be an fair estimator of shale volume in areas where mud filtrate and formation water resistivities contrast.