METHOD TO ESTIMATE CASING PIPE CEMENTING QUALITY WITHIN MULTISTRING LINING INTERVALS Russian patent published in 2007 - IPC G01V1/40 

FIELD: development survey, particularly to control gas and oil wall casing pipe cementing quality.

SUBSTANCE: method to estimate cementing quality of casing pipes within lining including several strings involves providing logging with acoustic cementing quality control apparatus; recording acoustic waves reflected from each string coupling and from reservoir boundaries inside well; identifying acoustic waves and referring thereof to one of wave types, namely to the first type - waves propagating along each well lining string (Lamb waves), to the second type - waves propagating along several connected lining sections as along integral lining, and to the third type - surface waves defined by surface, which separates liquid and solid bodies (Stoneley waves). Cementing defect presence may be detected from the first and/or the second reflected wave type presence and Stoneley wave absence. Perfect cementing quality may be detected from absence or rapid damping of the first and/or the second deflected wave types and from Stoneley wave presence.

EFFECT: increased accuracy.

1 dwg