Study on the Interaction Mechanism of Packer Slips and Thick Wall Casing

摘要

The slips should go into casing for certain depth to set the packer when well testing, but the casing may bedamaged seriously if the setting force is too large. To make known the interaction mechanism of packer and casing, andthen provide basis for the choice of hanging load of casing and shape optimization of slips, the maximum hoop stress ofcasing in the inner wall was deduced by the thick wall theory and the limited setting force was obtained by the strengththeory. The changes of the limited setting force of casing with the variable length of packer and the face angle of slip teethwere discussed taking the general packer and casing as example. It was found that the limited setting force of casingincreased with the length of slip when the packer and casing kept the same. The shorter the slip, the faster the force grows.Also, the limited setting force of casing increased non-linearly with the face angle of slip teeth. The smaller the angle, thefaster the force grows.