注氮气控制稠油油藏底水水锥技术

针对单家寺稠油油藏主力油层水淹严重，热采油汽比接近蒸汽吞吐经济极限的现状，对注氮气控制底水锥进及热氮混注提高热采采收率技术进行了有益探索。矿场试验结果表明，该技术有效地抑制底水锥进和蒸汽超覆，改善了吞吐井生产效果，成为“十五”期间巨厚块状底水稠油油藏多周期吞吐后控制底水锥进、提高热采采收率的有效手段之一。

Nitrogen injection technique for controlling bottom water coning in heavy oil reservoir

EOR technique of thermal recovery for controlling bottom water coning in nitrogen injection and heat nitrogen mixed injection are explored in the light of the present situation that watered out severely appears in major reservoirs and oil steam ratio in the thermal recovery is near the economic limit of steam stimulation in heavy oil reservoir of Shanjiasi area. The field experiment results show that bottom water coning and steam override may be suppressed effectively and the production effect of the steam stimulated well may be improved by using this technique, and it is becoming one of the effective measures for controlling the bottom water coning and improving oil recovery of thermal recovery after several cyclic stimulation in heavy oil reservoir with massive bottom water during "tenth five" period.