METHOD FOR DETERMINING A FLUID CONTACT LEVEL IN A FORMATION

摘要

1. A probe for determining the depth of a fluid contact level according to claim 1 comprising a first pressure probe comprising a first pressure transducer which is mounted in a measuring chamber of which one side is permeable to the first fluid and impermeable to the second fluid, which side is pressed against the borehole wall during a predetermined period of time while the pressure transducer is actuated; a second pressure probe comprising a second pressure transducer which is mounted in a measuring chamber of which one side is permeable to the second fluid and impermeable to the first fluid, which side is pressed against the borehole wall during a predetermined period of time while the second pressure transducer is actuated. 2. The probe assembly of claim 1, comprising an elongate probe carrier body to which the first and second fluid transducer are movably secured at diametrically opposite locations such that the transducers can simultaneously be expanded against and retracted from the borehole wall. 3. The probe assembly of claim 1, wherein probe assembly is designed to measure the oil-water contact level and the first pressure probe has a measuring chamber which is filled with water and has a side made of a selective water permeable ceramic membrane which is in use pressed against the borehole wall and the second pressure probe has an oil-filled measuring chamber and a side made of a selective oil permeable membrane which is in use pressed against the borehole wall.