MEASUREMENTS IN A FLUID-CONTAINING EARTH BOREHOLE HAVING A MUDCAKE
First Claim
Patent Images
1. A method for determining a property of formations surrounding a fluid-containing borehole having a mudcake on the surface thereof, comprising the steps of:
- providing a first electrode at the borehole side of the mudcake and a second electrode at the formation side of the mudcake; and
measuring the electrokinetic potential between said first and second electrodes.
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Abstract
A method for determining true formation pressure in formations surrounding a fluid-containing borehole having a mudcake on the surface thereof, including the following steps: at a particular location in the borehole, monitoring the electrokinetic potential across the mudcake; modifying the borehole pressure at the particular location in the borehole; and determining the true formation pressure in the formations surrounding the particular location as being the borehole pressure at which the electrokinetic potential is substantially zero.
23 Citations
27 Claims
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1. A method for determining a property of formations surrounding a fluid-containing borehole having a mudcake on the surface thereof, comprising the steps of:
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providing a first electrode at the borehole side of the mudcake and a second electrode at the formation side of the mudcake; and measuring the electrokinetic potential between said first and second electrodes. - View Dependent Claims (2, 3)
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4. A method for determining true formation pressure in formations surrounding a fluid-containing borehole having a mudcake on the surface thereof, comprising the steps of:
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at a particular location in the borehole, monitoring the electrokinetic potential across the mudcake; modifying the borehole pressure at the particular location in the borehole; and determining the true formation pressure in the formations surrounding said particular location as being substantially the borehole pressure at which said electrokinetic potential is substantially zero. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A method for determining true formation pressure in formations surrounding a fluid-containing borehole having a mudcake on the surface thereof, comprising the steps of:
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modifying the pressure in the borehole; at a particular location in the borehole, determining a plurality of measurement pairs of borehole pressure and electrokinetic potential across the mudcake; and determining the true formation pressure at the particular location in the borehole, using said measurement pairs. - View Dependent Claims (12, 13, 14)
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15. Apparatus for measuring a property of the mudcake on a fluid-containing borehole in earth formations comprising:
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a logging device that is movable through the borehole; said logging device having first and second electrodes, said first electrode being positionable substantially adjacent to the mudcake on the borehole side thereof, and said second electrode being positionable to substantially penetrate the mudcake; and means for measuring the electrokinetic potential between said first and second electrodes. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification