Such current cement sheath evaluation devices as fluid-compensated bond logs or ultrasonic-type logging devices were used to determine the presence of primary cement channels. After analyzing only a relatively few problem wells, it became evident that something drastic had problem wells, it became evident that something drastic had happened to the cement sheath in each well. In all the wells investigated, clean cement was circulated to surface with no indication of lost circulation or fallback; however, the presence of a cement sheath was not evident.
The presence of a cement sheath was extremely difficult to prove on the ultrasonic logs as well. Without evidence of a viable cement sheath on any of the logging devices, the existence of a mud channel in the primary cement sheath was difficult to ascertain. With the understanding that full circulation was attained during primary cement placement, gas-cut cement is readily identifiable on ultrasonic logging devices, cement particles cannot enter formation-matrix permeability, and cement once it has set does not magically disappear from the annulus, it was readily apparent parent that something had destroyed the cement sheath.
Further investigations indicated that all these production casing strings had been exposed to either high internal test pressures or high surface flowing or injection temperatures. Sign In or Register. Advanced Search. Sign In. Skip Nav Destination Article Navigation. Close mobile search navigation Article navigation. Volume 7, Issue This article was originally published in. Previous Article. Article Navigation. December 01 Cement Sheath Stress Failure K.
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