Temperature logging for flow outside casing of wells
OwnerClaude E. Cooke, Jr.inventor
Life of this patent
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Abstract
Apparatus and method for detecting varying flow velocity at differing points outside the casing in a wellbore are provided. The flow is detected by stationary temperature sensors inside the casing. Logging means, sensors left in the well with data storage, data telemetry to surface and downhole alarm systems are provided. Measurements are used for detecting lack of mechanical integrity of a wellbore, hydraulic fracture extent along a wellbore, vertical flow in a formation or other occurrences of non-uniform flow.
Claims20
A method for detecting flow of a fluid at a selected location outside a casing of a well comprising:
- placing a plurality of stationary temperature sensors having means for deflecting flow away from the sensors in contact with the inside wall of the casing at the selected location, the sensors being spaced apart and in proximity to a plane transverse to the axis of the casing;
- and
- measuring differences in temperature of the casing wall to detect flow of fluid outside the casing.
Apparatus for detecting the presence of a hydraulic fracture at a selected location in a well having a casing, the casing having an inside wall, comprising:
- means for positioning a plurality of temperature sensors at fixed points in contact with the inside wall of the casing at the selected location;
- means for deflecting fluid flow inside the casing away from the sensors;
- and
- electronic means for measuring differences in temperature of the casing wall at points of contact of sensors on the casing wall.
Apparatus for detecting the presence of flow in a formation at a selected location surrounding a well having a casing, the casing having an inside wall, the flow being in a direction along the wellbore, comprising:
- means for positioning a plurality of temperature sensors at fixed points in contact with the inside wall of the casing at the selected location;
- means for deflecting fluid flow inside the casing away from the sensors;
- and
- electronic means for measuring differences in temperature of the casing wall at the points of contact.
Dependencies are inferred from the claim text.