Production and stimulation monitoring
AssigneeSchlumber Technology Corporation
InventorsDominic Joseph Brady, Mehdi Ghommem, Xiangdong Qiu, Mustapha Abbad
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Abstract
A downhole electrode assembly is provided for deployment in a wellbore that traverses a rock formation, wherein the wellbore is filled with a wellbore fluid. The electrode assembly includes an electrode for contacting the rock formation and a pliable structure that is configured during operation to contact the rock formation and provide a fluid barrier that isolates the electrode from the wellbore fluid. The assembly further includes a force member configured to apply a force that presses the assembly against the rock formation.
Claims20
A downhole electrode assembly for deployment in a wellbore that traverses a rock formation, wherein the wellbore is filled with a wellbore fluid, the assembly comprising:
- an electrode for contacting the rock formation;
- a pliable structure that is configured during operation to contact the rock formation and provide a fluid barrier that isolates the electrode from the wellbore fluid;
- and
- a force member configured to apply a force that presses the assembly against the rock formation.
A method for characterizing a rock formation that is traversed by a wellbore, the method comprising:
- deploying at least one downhole electrode in contact with the rock formation at a desired location in the wellbore, wherein the at least one downhole electrode is operably coupled to an acquisition unit;
- injecting a first fluid into the rock formation;
- using the downhole electrode and acquisition unit to measure and record a first potential signal in response to flow of the first fluid in the rock formation;
- injecting a pad of a second fluid into the rock formation, wherein the second fluid is different from the first fluid;
- using the downhole electrode and acquisition unit to measure and record a second potential signal in response to flow of the pad of a second fluid in the rock formation;
- and
- inferring a property of the rock formation using the first potential and the second potential.
Dependencies are inferred from the claim text.