High temperature downhole gauge system
AssigneeZenith Oilfield Technology Limited
InventorDavid Sirda Shanks
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Abstract
A gauge system and method for monitoring well pressure at temperatures in excess of 300° C. used in permanent monitoring of oil and gas wellbores. The gauge system includes an analog output transducer and a long cable which is an extruded mineral insulated multi-core cable with a seam welded corrosion resistant metal outer sheath. The transducer is enclosed in a pressure tight corrosion resistant housing and the housing is pressure sealed to the metal outer sheath. The method includes applying signal conditioning and processing to the measurements to compensate for characteristics of the transducer, the cable and the environment and thereby provide continuous monitoring of the wellbore.
Claims24
A gauge system for use in wellbores, the system comprising an analogue output transducer and a cable, wherein the cable is an extruded mineral insulated multi-core with a seam welded corrosion resistant metal outer sheath;
- the transducer is enclosed in a pressure tight corrosion resistant housing;
- and the housing is pressure sealed to the metal outer sheath.
A method of continuous monitoring in a wellbore, the method comprising the steps:
- (a) connecting an analogue output transducer to a cable of extruded mineral insulated multi-core with a seam welded corrosion resistant metal outer sheath;
- (b) mounting the transducer and connector in a pressure tight corrosion resistant housing;
- (c) pressure sealing the housing against the metal outer sheath;
- (d) mounting the housing on tubing and running the tubing into a wellbore, to a high temperature location;
- (e) taking measurements from the transducer;
- and
- (f) applying signal conditioning and processing to measurements to compensate for characteristics of the transducer, the cable and the environment and thereby provide continuous monitoring of the wellbore.
Dependencies are inferred from the claim text.