Mechanical analysis of production casing damage due to sand production

Key words:  sand production  casing damage  cavity  sand production volume  mechanicel analysis

Abstract:

Based on the theory of M. M. PROMOJIYFAKONOV，cavity configuration was analyzed considering the interaction of casing and formation. The shape of cavity wss a kind of para curve. The calculation formula of the axial force acting on the casing at the cavity was derived. By considering casing damage as destabilization bending of compression oolumn with fixed terminals，the relation between casing damage and sand production volume was established. The influence of different steel grade and wall thickness on sand production volume wss analyzed while casing is destabilized. tt is shown that the casing with high intensity and big wall thickness should be used in the oil fields with serious sand production. The results an help to design casing for the fields，and judge if casing damage has taken place by monitoring sand production volume. So effective measures of sand oontrcl can be taken to prevent casing damage.