Systems and methods for downhole resistance measurements
AssigneeSchlumberger Technology Corporation
InventorsMark Hofacker, Jordi Juan Segura Dominguez, Carlos Urdaneta
Life of this patent
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Abstract
A system may convey a conveyance line including an electrical cable in a downhole environment. A system may measure a distributed electrical resistance of the electrical cable. A system may select a first point of the electrical cable. A system may, based on a first electrical resistance at the first point and a known initial electrical resistance, determine a first cable temperature of the electrical cable at the first point.
Claims11
A method of measuring temperature in a downhole environment, the method comprising:
- conveying a conveyance line including an electrical cable in the downhole environment;
- measuring a distributed electrical resistance of the electrical cable;
- selecting a first point of the electrical cable;
- based on a first electrical resistance at the first point and a known initial electrical resistance, determining a first cable temperature of the electrical cable at the first point;
- selecting a second point of the electrical cable;
- measuring an external temperature proximate to the second point;
- based on a second electrical resistance at the second point and the known initial electrical resistance, determining a second cable temperature of the electrical cable at the second point;
- determining a temperature offset based on the external temperature and the second cable temperature;
- and
- adjusting the first cable temperature based on the temperature offset.
A method of measuring temperature in a downhole environment, the method comprising:
- conveying a conveyance line including an electrical cable in the downhole environment, wherein the electrical cable is a portion of a hybrid cable including an optical line;
- measuring a distributed electrical resistance of the electrical cable;
- selecting a first point of the electrical cable;
- based on a first electrical resistance at the first point and a known initial electrical resistance, determining a first cable temperature of the electrical cable at the first point;
- selecting a second point of the electrical cable;
- measuring an optical temperature proximate to the second point;
- based on a second electrical resistance at the second point and the known initial electrical resistance, determining a second cable temperature of the electrical cable at the first point;
- determining a temperature offset based on the optical temperature and the second cable temperature;
- and
- adjusting the first cable temperature based on the temperature offset.
Dependencies are inferred from the claim text.