CBMT固井质量评价分析OA

Quality evaluation of well cementing mainly involves examining the bonding condition of the first interface between the outer cement sheath and the outer wall of the casing,as well as the second interface between the casing and the formation.It also involves examining the complex cementing conditions such as micro annular gaps and channeling in the cement sheath.Taking the logging data obtained by the self-de-veloped instrument CBMT of CNOOC Oilfield Services as an example,the factors that affect the interpreta-tion of cementing quality is analyzed.Based on the different manifestations of casing waves and formation waves,the bonding situation of the first and second interfaces is qualitatively analyzed.Combined with on-site cementing quality evaluation examples,the reasons for poor cementing quality are summarized.It is be-lieved that the instrument eccentricity,cement filling situation outside the casing,engineering measures,etc.affect the cementing quality evaluation.