ABSTRACT

The borehole televiewer is an acoustic logging tool that produces an acoustic image of the wellbore to delineate such features as fracture density, bedding planes, orientation, and vugs in the open hole and for determination of perforation patterns, pipe conditions, etc., in casing. This logging concept was introduced by the Mobil Oil Company in 1969. Subsequently several logging companies obtained licenses and offered this logging service to the industry. Due to a lack of acceptance by the industry, it was removed from the market except for one service company. The need for the information provided by the televiewer is now even greater since the production of hydrocarbons in many of today's reservoirs is through natural and induced fractures. Because no other combination of logs can provide data comparable to the televiewer, a reevaluation of this technique was made. Improved data recording techniques with a video tape recorder has enabled multiple logs to be produced from a single run in the borehole that highlights various features of the borehole. Further improvements in the data presentation include displaying the data on high resolution fiber optics recorder. Image enhancement techniques using homomorphic principles and fast Fourier transforms have been used to improve delineation of fractures.

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