关键词: 固井质量, 测井, 胶结强度, 层间封隔, 评价标准

Abstract: Up to now,the criteria of cement evaluation using logging data do not consider the depth.In China,the evaluation is limited in evaluating the quality of the cement sheath and ignores analyzing the cement zone-isolation abilities. Therefore,there are many erroneous evaluations.The data of channeling test,drilling,cementing,and cement logging,etc.have been analyzed statistically. A series of laboratory experiments have been made on the compressive strengths,the shear strengths of cement sheath interfaces and relative sonic responses,and their relations between have also been studied. From those above,a new criterion of cement evaluation in Oilfield J has been worked out based on the ideas as follow:(1) The cement evaluation criteria should vary with depths;(2) The zone-isolation evaluation can be done by analyzing the data of cement logging;(3) The shear strengths of cement sheath interfaces can also be used to evaluate the abilities of zone-isolation.

Key words: cementing quality, logging, bonding strength, zone isolation, evaluation criterion