通过新的流量控制理念改善油井和油藏管理实践,延长受窜水影响的生产井的寿命,位于阿联酋阿布扎比的某大型碳酸盐岩油田

Jhon Robert Ortiz Requena, Maryvi Martinez, Fatma AlShehhi, Fareed Ahmad Daudpota, A. Fawzy
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引用次数: 0

摘要

X油田位于阿联酋,自20世纪70年代以来一直采用水驱作为二次采油策略进行开发。随着水前缘向油库推进,许多油田普遍采用减小节流孔以控制含水趋势的做法。然而,在生产中高含水的井中,这种做法已被证明会在井筒底部产生过量的水沉淀,导致井过早失活。X油田北部Z油藏是一个采用外围注水模式的黑色油区。自第一次采油以来,生产井一直采用自然举升方式,并将继续采用自然举升方式,直到人工举升项目在几年内投入使用。与此同时,由于水侵加速的风险更高,因此越来越多的井提前停产,油田生产平台也面临着生产可持续性的挑战。这导致了对井和油藏管理策略的重新评估,以确定改进的做法,以最大限度地延长湿井的自然生命周期,并确保符合油田生产配额。因此,设计并采用了一种新的井管理方法,在早期阶段识别和优化可能受水负荷管理不当影响的井。从概念上讲,这种新的实践包括全面分析井的操作条件,最终产生一个流动操作窗口,该窗口可以改善井筒中的多相流性能,最大限度地减少水滑,避免水滑沉降及其相关问题,同时遵守最佳油藏管理的技术准则。根据从便携式测试作业、饱和度测井、PLT和生产监测中收集的观察和数据;该方法被称为临界流量分析,已成功应用于X油田Z油藏的几口自然流动井,含水率在15 - 40%之间,延长了自然寿命,增加了采收率,避免了非活动管柱数量对现场管理KPI的负面影响。在Z油藏中,临界流量分析是一种综合的油井管理评估和作业理念,它有助于更有效地管理高风险地区的油井,并以更节省成本的方式进行作业,此外,它还有助于建立油井和油藏管理的最佳实践,这些实践可以推广到该地区的模拟油田。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Improving Well and Reservoir Management Practice Through New Flow Control Philosophy that Prolongs the Life of Production Wells Affected by Water Breakthrough in A Giant Carbonate Oil Field, Abu Dhabi, United Arab Emirates
X Field located in the United Arab Emirates has been developed since 1970's by waterflooding as secondary recovery strategy. As water front advances into oil bank, the well operation practice commonly adopted in many fields for oil wells cutting water has consisted in reducing choke aperture in an attempt to control the water cut trend. However, in wells producing moderate to high water cut, this practice has proven to generate excess water settling in the bottom of the wellbore leading to premature inactivation of the wells. The reservoir Z in the north of X Field, is a black oil block operated by peripheral and pattern waterflooding. The production wells have been operating by natural lifting since first oil and will continue in natural flow until the Artificial Lift projects are commissioned within a few years. Meanwhile, the field production plateau has been increased arising challenges of production sustainability due to higher risk of acceleration of water breakthrough and consequently higher number of wells becoming inactive earlier. This led to re-assess the Well and Reservoir management strategy to define improved practices oriented to maximize the natural life cycle of wet wells and ensure the compliance of the field production quota. As a result, a new well management approach was devised and adopted to identify and optimize at the earliest stage, wells potentially affected by water loading mismanage. Conceptually, this new practice consisted in comprehensively analyzing well operating conditions, which ultimately generated a flow operating window that improved the multiphase flow performance in wellbores, minimized water slippage avoiding it to settle down and its associated problems, whilst respecting the compliance of technical guidelines for optimum reservoir management. Based on observations and data gathered from portable testing jobs, saturation logs, PLT and production monitoring; a methodology referred in this work as Critical Flow Analysis, has been successfully implemented in several naturally flowing wells with water cuts ranging from 15 – 40 % in Reservoir Z in X Field, which resulted in prolonged natural life, extra oil recovered, and avoided the negative impact of inactive string count on the Field Management KPI. The Critical Flow analysis has been a comprehensive well management evaluation and operation philosophy in Reservoir Z which helped to manage more efficiently and in cost-saving fashion the performance of oil wells located in high risk areas, in addition to contribute with stablishing best practices for well and reservoir management that could be extended to analog fields in the area.
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