Improving Lightweight Cement Evaluation in the Geothermal Environment

摘要

Logging techniques using low-density foam cement require careful evaluation to ensure that they are being implemented and interpreted correctly. The challenge to the geothermal environment is that as low-density foam has gained popularity, its use and interpretation has become increasingly difficult to evaluate. Previous work detailed the use of ultrasonic devices and evaluated new cement interpretation techniques in ten wells. These techniques include suggestions for log inputs, log quality control and the use of pressure to eliminate a potential micro annulus effect. In this paper three case studies applying these techniques are examined to reveal the effectiveness of cement evaluation and to recommend solutions to problems uncovered.