碳酸盐岩高温储层酸压工艺应用现状

Application Status of Acid Fracturing Technique in High-Temperature Carbonate Reservoir

碳酸盐岩高温储层酸压存在以下难点:酸岩反应速度过快,导致酸液有效作用距离短;酸蚀蚓孔的形成与不断扩大,增加了酸液滤失量;添加剂在高温作用下其性能大大下降。针对以上难点,碳酸盐岩高温储层酸压的关键在于能否获得较长的有效缝长。这就要求所选酸液应具有优良的缓速性能、降滤失性能和降阻性能。文章从酸压滤失机理出发,介绍了适用于碳酸盐岩高温储层酸压的工艺技术应用现状。

The difficulties of acid fracturing technology in high-temperature reservoir of carbonate rock follow: the reaction speed of acid rock is too fast to lead to minish the effective distance of acid liquid, and the formation and enlargement of wormhole during acid fracturing increase the loss of acid liquid, as well as the performance of additive in high-temperature reservoir descend greatly. So, the key process of acid fracturing technique in high-temperature carbonate reservoir is to get the larger and effective slit. This demands that the selected acid liquid must have some characters such as the lower reaction speed and the better fluid loss performance as well as the better friction reducing performance. Based on analyzing filtration mechanism of acid fracturing, this paper introduces the present application situation of the process be suit for acid fracturing technique in high-temperature carbonate reservoir