Patent ID: 8230915

Claim:
A method for determining vertical placement of injected fluid, the method comprising: providing a plurality of temperature detectors, each of the plurality of temperature detectors configured to provide a temperature estimate at an approximately known depth of a borehole, the detectors disposed at various radial angles around the borehole and configured to provide each temperature estimate at an approximately known radial angle within the borehole, the known radial angle comprising a relative radial angle and/or an absolute radial angle; providing a thermal insulator having a first thermal conductivity configured to thermally isolate the plurality of temperature detectors from an injection conduit and extending across a zone of interest in a formation, wherein the first thermal conductivity is lower than a second thermal conductivity of materials between the formation and the plurality of temperature detectors; injecting a fluid through the injection conduit into an injection zone in the formation; and determining a vertical extent of the injected fluid in the formation across the zone of interest based on the temperature estimate for each temperature detector; and detecting a fracture-borehole deviation when a highest fracture indicator and a lowest fracture indicator exhibit a narrower temperature response than at least one central fracture indicator.