Application of Coiled Tubing Technology in Water Finding and Water Plugging in Directional Multi-layer Combined Production Wells

Water production of gas well affects the normal production, and plugging water is an effective method to solve the problem of water production. For some wells which water production horizon are not clear, accurately finding out the water production horizon can improve the success rate of water plugging. But for the high inclination of the multi-layer commingled producing wells or horizontal wells, the conventional methods of cable/wire operation test for finding water are difficult. A method introduced in this paper can effectively solve the problem of the limitation of finding water in wire/cable test of high inclination multi-layer combined production wells. It is mainly to use coiled tubing technology, cooperate with temporary plugging system to plug different production horizons, and at the same time, combine with the change of ground production data, so as to judge the water producing horizon. After optimizing plugging agent system, coiled tubing is used to implement fixed-point plugging to achieve the purpose of accurate water plugging. The laboratory experiment and field application show that the technology has a certain reference significance for water exploration and plugging in highly deviated wells and horizontal wells.