Spontaneous potential as discussed is the potential difference that occurs naturally in the earth. If you plan to drill into the earth’s crust you need to have adequate knowledge on this theory. Do you believe you understand it clearly? If so then take up the test below and see if the results are in your favor. All the best!
True resistivity of the uninvaded formation (Rt)
A qualitative indicator of formation permeability
Mud filtrate resistivity (Rmf)
Formation porosity
Electrokinetic processes relate to the movement of fluid at the borehole/formation interface, while electrochemical processes relate to ionic imbalances between fluids.
Electrokinetic processes relate to ionic imbalances between fluids, while electrochemical processes relate to the movement of fluid at the borehole/formation interface.
Electrokinetic potentials
Electrochemical potentials
Membrane potential
Liquid junction potential
Membrane potential
Liquid junction potential
Electrokinetic potential
Membrane potential
Liquid junction potential
Electrokinetic potential
A downhole electrode and a current return electrode, both located on the tool
A downhole electrode and casing
A downhole electrode and a reference electrode at the surface
A downhole electrode and the wireline
Water-based mud
Cased hole
Air-drilled hole
Oil-based mud
Borehole drilled with very heavy mud
Hydrostatic pressure in the borehole balances formation pressure
Borehole drilled with light mud
Hydrostatic pressure is less in the formation than in the borehole
Rmf = Rw
Rmf > Rw
Rmf < Rw
Electrochemical potential
Electrokinetic potential
Membrane potential
Liquid junction potential
Determination of formation water resistivity (Rw)
Determination of volume of shale
Estimation of diameter of invasion
Well-to-well correlation
Determination of bed thickness
True
False
Voltage
Resistivity
Current
Power
Water-based mud
Cased hole
Air-drilled hole
Oil-based mud
Wait!
Here's an interesting quiz for you.