WebThe Dual Induction Log provides four measurements: Deep and Medium Induction curve, Shallow Focused Laterolog and a Spontaneous Potential curve. It is suitable in high-resistive mud systems. Application Detection … WebInduction logging tools were designed to work in oil-based drilling mud as laterolog does not works in the absence of conductive medium.In their simplest form induction tools are made of minimum two coils with one acting as transmitter and other acting as receivers mounted on mandrel co-axially.Modern induction tools operates at varied range of ...
Petrophysical data sources - PetroWiki
WebJun 25, 2015 · Annulus formation is a common phenomenon, caused by the sweeping of conductive ions from the formation by the invading borehole fluid. Fluid-flow models predict annulus formation in a wide range of formation/borehole fluid conditions. Annulus formation has been observed with both water-based mud (WBM) and oil-based mud (OBM). WebIn the late 1940s, induction log was developed, which works in nonconductive oil-based mud environments. ... Common resistivity tools include, but are not limited to, dual laterolog and microspherically focused log. Additionally, dual induction logs are also employed to determine fluid type and saturation, and are equipped with induction coils ... microcontroller embedded linux
Formation resistivity determination - PetroWiki
WebJun 24, 2015 · In such areas, there may, therefore, be few resistivity logs. Laterologs are preferred to induction logs when the drilling mud has moderate to high salinity. This … WebAug 1, 2012 · The recently discovered carbonate reservoirs off-shore Brazil are typically drilled with oil-based mud to avoid drilling and completion problems in the 2000 m of salt overlying the reservoir. NMR logs are routinely run in the reservoir section and the interpretation methods developed for carbonates drilled with water-based mud have … Laterologand induction logging tools each have unique characteristics that favor their use in specific situations and applications. The induction log is generally recommended for holes drilled with only moderately conductive drilling muds or nonconductive muds (e.g., oil-based mud (OBM)) and for empty … See more Commercial induction tools consist of multiple coil arrays designed to optimize vertical resolution and depth of investigation. However, to illustrate induction-tool … See more To produce adequate sensitivity to the uninvaded zone, induction tools perforce include signals from a large volume of formation. The challenge is to determine exactly where the measurement is coming from in the formation. … See more One of the challenges of measuring formation resistivity is to sort out the resistivity of the invaded zone from that of the virgin zone. The … See more Because the direct transmitter-receiver mutual coupling of a two-coil array can produce a voltage several thousand times that from a formation, … See more the oracle new paltz