METHODS AND APPARATUS FOR WELLBORE ANNULUS CEMENTING

摘要

A tubular installation in place in a wellbore includes a tubing string andcementedannular zones and annular zones free of cement between the tubing string andthewellbore wall. The annular zones are isolated from each other by annularpackers onthe tubing and the cemented annular zones are cemented through at least a pairofcementing ports axially spaced apart along the wall of the tubular string eachprovidingcommunication between the inner bore and the annular zone to be cemented.Cementin each cemented zone is introduced through a first of the cementing ports,with cementcirculation permitted by evacuation from the zone through a second of thecementingports. The cemented zones stabilize the wellbore and annular zones free ofcement areopen to receive fracing fluid through a frac port on the tubing string.