Some aspects of leak-tightness of oil and gas wells structures
A well, being looked upon as a structure, should provide leak-tightness of casing string annulus by means of a reliable separation of rocks. However, judging by the experience, the existing well structures as well as technical and process solutions of casing strengthening in many cases do not provide leak-tightness and do not exclude possibility of inter-zonal communication and between casing pressure. The article presents solutions aimed at improvement of rocks exposure quality and their separation developed on the basis of analysis of factors influencing a well leak-tightness and pressure loss.