Some articles on formation, formations, formation water:
... The origin of SP across formation can be attributed to two processes involving the movement of ions Streaming potential (Ek) Electrochemical potential (Ec) Streaming potential originates from the ... The streaming potential appears when mud filtrate is forced into the formation under the differential pressure between mud column and formation ... potential is produced when the flow takes place across mud-cake in front of permeable formations, across permeable formations being invaded, and across shale ...
... difference between the drilling mud and the formation water acts as a natural battery and will cause several voltage effects ... of charged ions between the hole and the formation water where there is enough permeability in the rock ... The most important voltage is set up as a permeable formation permits ion movement, reducing the voltage between the formation water and the mud ...
Famous quotes containing the words water and/or formation:
“Man is but a reed, the feeblest one in nature; but he is a thinking reed. The entire universe need not arm itself to crush hima vapor, a drop of water suffices to kill him. But if the universe were to crush him, man would still be nobler than that which killed him, because he knows that he dies and the advantage which the universe has over him; the universe knows nothing of this.”
—Blaise Pascal (16231662)
“That for which Paul lived and died so gloriously; that for which Jesus gave himself to be crucified; the end that animated the thousand martyrs and heroes who have followed his steps, was to redeem us from a formal religion, and teach us to seek our well-being in the formation of the soul.”
—Ralph Waldo Emerson (18031882)