Application of short liner cementing technique in casing damaged well governing of the Tahe oil field

With the long-term development of water, nitrogen injection in the Tahe oil field, well casing damage becomes more and more serious, especially in some old wells, due to the long working time of casing pipe, poor cementing quality, and low casing pipe strength. Pipes often broke at casing suspension or weak parts. As a result, formation water invaded, leading to high water cut in oil wells. The main technologies for casing damage governing are seal plugging and cementing; however, they have a limited applicability and short finite time. At present, a short liner cementing technique is used in the Tahe oil field, and can solve the problem of oil well casing damage at once and forever. In this paper, through the analysis of the three types of casing damage governing methods, focusing on the advantages of the short liner cementing technique, it provides an important basis for the promotion of the technique.