缝洞型油藏注水替油失效井原因分析及治理方法

Failure reasons of water injection replacing oil in fractured-vuggy oil reservoirs and its countermeasures

付栋 李桂云 秦雪源 唐博超 杨烽 黄米娜 杨凤民

Fu Dong Li Guiyun Qin Xueyuan Tang Bochao Yang Feng Huang Mina Yang Fengmin

中国石化 西北油田分公司 采油三厂, 新疆 轮台 841600

No.3 Oil Production Plant, SINOPEC Northwest Company, Luntai, Xinjiang 841600, China

塔河油田奥陶系油藏为典型的缝洞型碳酸盐岩油藏。受多期构造作用、岩溶作用和成岩作用的叠加改造，形成了由孔、洞、缝组成的储集空间和渗流通道。自2005年在TK741井注水开发试验取得成功以来，西北油田针对能量快速递减的缝洞型油藏实施大规模注水开发，随着开发不断深入注水失效井逐步增多。以采油三厂为例，结合注水替油失效井注采比、注水排量、能量指示曲线以及注水指示曲线进行原因分析总结，合理运用物质平衡原理及油藏工程技术方法，针对不同失效类型进行剩余油分析，同时制定出相应的治理方法，并对现场应用效果进行评价，取得了良好效果。

The Ordovician oil reservoirs in the Tahe oil field are typical carbonate fractured-vuggy oil reservoirs. The reservoir spaces and immigration channels mainly consist of pores, caves and fissures, which were formed by superposition reformations including tectonic action, karstification and diagenesis. In view of the rapid decline of formation energy, water injection replacing oil has been implied in a great scale in the Northwest oil field since the success of water injection in well TK741 in 2005. However, the failure wells in water injection replacing oil are gradually increasing, and the failure well proportion is up to 22% in No. 3 Oil Production Plant region. The failure reasons of water injection replacing oil were analyzed and summarized based on injection-production ratio, water injection displacement, energy indicative curve and water injection indicative curve. Material balance mechanism and oil reservoir engineering technique were applied to analyze remaining oil in view of different fai-lure reasons. Some countermeasures were proposed and had achieved good effects in field practices.

https://doi.org/10.11781/sysydz2017S1056