Application of squeeze-injection and plugging string in horizontal wells of Tahe oilfield

In the production process of the horizontal well, interlayer crossflow, external casing channeling and edge and bottom water coning often led to high water-cut. On the basis of mature squeeze-injection and plugging string of vertical wells, we improved the squeeze-injection bridging plug, drillable bridging plug, setting tool and string technology. And we developed a new technology of squeeze-injection and plugging string suitable for horizontal wells in which squeeze-injection bridging plug and midway setting prevention bridging plug are core tools. Squeeze-injection test in 2 wells and plugging test in 8 wells show that this technology is an effective means to solve the problem of interlayer crossflow and poor cementing quality. The technology is designed especially for horizontal well, reducing the time, cost and risk of string operation. It can be used independently or combined with other tools to effectively implement squeeze-inject and plugging operation for high water-cut layer or external casing channel.