厄瓜多尔低幅度构造强天然水驱油田开发形势与技术对策

Production status and technical solutions for reservoirs with low relief structure and strong natural aquifer in Ecuador

在总结厄瓜多尔低幅度构造强天然水驱油田自2006年2月以来取得的开发成果和已形成的开发配套技术的基础上,分析了油田开发面临的形势和挑战,提出了技术需求和稳产策略。研究区面临的主要开发形势包括:储采比小,储量替换率低,区块稳产基础差;主力油田剩余油分布零散,挖潜难度大;老区可供加密的井位有限;主力油层单一且厚度小,措施实施难度大;设备老化,电力故障频繁,开井时率低。针对研究区的开发形势和挑战,提出了油田开发的技术需求和稳产策略,主要包括低幅度构造识别、剩余油分布预测、水平井开发技术、老井剩余油挖潜、特高含水期稳油控水配套技术和注采系统优化等。

Based on the summary of achievements and technologies of oilfield development for Ecuador reservoirs with low relief struc-ture and strong natural aquifer since 2006, the current situation and challenges are analyzed herein, and then, some expected tech-niques and solutions for stabilizing oil production are proposed. The suitable technologies for exploration and development of this blockinclude: techniques for identification of low-relief traps and integrated predication for thin reservoirs, fine reservoir description tech-niques, remaining oil distribution prediction, cluster horizontal wells with large displacement in jungle, techniques for controlling watercut and stabilizing oil rate in ultra-high water cut stage. The current situation and challenges of the block include: due to the low re-serve-production ratio and reserve replacement rate, the block has weak reserve basis for stable oil production; the remaining oil inmain fields is distributed very complex and scattered, and very difficult to locate; there's no space for infilling wells in oil areas; theunique pay zone has small remaining thickness, the wells have little potential for stimulation; due to the large liquid production, the ca-pacity of surface equipment cannot meet the requirement for stimulation, therefore, some wells with high water cut have to be shut off tocontrol the water yielding. Aiming at the current situation and challenges mentioned above, this paper presented some expected tech-niques and solution for stabilizing oil production, including identification of low relief traps, remaining oil distribution prediction, hori-zontal well techniques, integrated stimulation techniques and optimization of injection-production system.