Composite Water Shutoff Technology for Horizontal Wells of Ultra-deep Clastic Reservoir With Bottom Water

For horizontal wells of Clastic reservoirs in Tahe oilfield after multi-round water shutoff, wells potential became smaller, increase of oil rate of single-well by water shutoff decreased, and the water shutoff efficient declined. In this paper, composite water shutoff efficiency technology for ultra-deep clastic reservoirs with bottom water in Tahe oilfield was presented. The technology is a combination of different types of plugging agents, plugging agent slug with different intensity, and to increase the intensity and amount of plugging agents. It can decrease gradually decreasing trend of multi-round shutoff effect. The field test in Tahe oilfield TK107 H well has gained success, and certain stimulation effect has been achieved.