X-ray diffraction and dilation studies have shown that alloys near the stoichiometric TiNi composition undergo transformation into the related phases Ti2Ni and TiNi3 at low temperatures. The main factors controlling these phase transformations are alloy composition, temperature, and mode of plastic deformation. In plastic deformation, tensile or compressive stressing produced separate and unlike decomposition phases; this finding was dramatically demonstrated by unique temperature-sensitive dimensional changes in plastically deformed specimens. Changes of large magnitude in vibration damping have also been noted and appear related to variations in the phase equilibria of the system.

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American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Discussion of this paper is invited. Three copies of any discussion should be sent to the Society of Petroleum Engineers office. Such discussion may be presented at the above meeting and, with the paper, may be considered for publication in one of the two SPE magazines. Abstract A new technique is presented that will quantify the losses to the formations in the well bore utilizing tracer profiles. The method is supported analytically and provides a sound basis for tracer profiles not available with other surveys in the field today. This quantitative technique utilizes the intensity of the radioactive tracer material as a function of depth. As the material is lost through the casing performations and open hole sections into the formation, the intensity of the tracer material remaining in the borehole is related to the intensity before any losses occur. The gamma ray count rate is related to the intensity by correcting the observed count rate for system resolving time and integrating the corrected count rate as the tool moves through the radioactive material. The integral of the corrected count rate of each drag run through the material is normalized to the intensity before any losses to the formation take place. place. The accuracy of this system over an existing manual geometric approximation technique is demonstrated by several field examples. Introduction Current methods to determine the vertical water injection distribution include radioactive velocity measurements and radioactive tracer logging. Velocity determination is performed by measuring the time elapsed for a slug of radioactive material to travel a known distance between two detectors. The velocity measurement and the well bore diameter are then used to obtain quantitative injection distribution. The tracer profile technique utilizes a single detector to determine the injection profile by determining the intensity of the radioactive material in the well bore as a function of depth. A geometrical measurement is made of the recorded response in the surface unit and is related to the response of the tool as it passes through the radioactive slug as moving in the well bore. Comparison of the geometrical plots provide a profile of losses in the well bore. provide a profile of losses in the well bore. On occasions the velocity profile and the tracer profile have presented a difference in loss profile have presented a difference in loss percentage plots. percentage plots.