The Casing Programme and Completion Technology of Reinjection Well in Porous Sandstone Reservoir in Tianjin, China

Abstract

It is quite early to make a study and test on reinjection into porous sandstone reservoirs in Tianjin, and make a certain extent of success, as focusing on the casing programme and completion technology of reinjection wells in porous sandstone reservoirs has just occurred in the latest five years. Different casing programmes have been designed for different types of porous sandstone reservoirs in the Tianjin area, including the single open large-diameter borehole with gravel packing, the second open monolayer strainer, and the reinjection wells changed from abandoned oil wells. This last programme is accomplished through analysis of the reservoir’s structure, reservoir simulation, practical application in the well, and reinjection testing. On the side of completion technology, we adopted a series of techniques consisting of improving the mud capability, well-passing and wall-breaking before running casing, and joint well-washing. Practice shows these methods have good effects worthy of further application.