分层注水技术在中亚RN非均质碳酸盐岩油田的应用

Application of selective water injection in heterogeneous carbonate reservoirs in RN Oilfield,Middle Asia

RN油田是中石油海外经营开采最早的、中亚规模较大的碳酸盐岩油藏。油田自然递减率高,主力油藏地层压力保持水平低,纵向动用程度不高,层间矛盾大。结合油田实际情况,研究了3种分层注水技术——液力投捞分层注水、同心双管分层注水、桥式偏心分层注水技术。现场应用表明,桥式偏心分层注水和同心双管分注技术应用效果显著,液力投捞分注技术不适用于该油田。该研究对海外碳酸盐岩油田开发具有重要指导意义。

RN oilifled is the earliest large oilifeld in Middle Asia developed by Petrochina overseas. The oilifeld faced high produc-tion decline, low reservoir pressure maintaining, low vertical producing degree, serious conlficts between layers. According to actual conditions of the oilifeld, three types of effective and economic separated layer water injection techniques have been selected：separated layer water injection by hydraulic running and pulling, concentric pipe separated layer water injection and bridge-type eccentric separate layer water injection. Field application shows bridge-type eccentric separated layer water injection and concentric pipe separated layer water injection work well in this oilifeld, separated layer water injection by hydraulic running and pulling is not suitable for this ifeld. The research results are instructive to the high efifcient development of overseas carbonate oil ifelds.