An Uneven Acid Injection Technology for Long-Lateral Horizontal Wells in Complex Carbonate Reservoirs: Simulation, Optimisation and Practice

Honglan Zou, M. Cui, He Liu, C. Liang, Ping-li Liu, Heng Xue, Pei-shan Wang
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引用次数: 2

Abstract

Focusing on the characteristics of long horizontal interval (>800m) and strong heterogeneity of complex carbonate reservoir, this paper puts forward a high efficiency uneven acid distribution technology, consequently solving the problems of high large scale and financially-challenged acidizing result. It takes the damage profile in productivity established stage or liquid production profile in the stable production stage for horizontal wells as the designed core, and selects optimal injecting point and interval in the long-interval horizontal well to maximize stimulation effect with minimal acid. This paper establishes an integrated mathematical model for the quantitative analysis of non-uniform damage of horizontal well simulated acidizing diverting and the acid-etched wormholes propagation for complicated carbonate reservoir. Besides, the matching technological methods and strategies, such as whole or local selective acid injection using coil tubing, inert liquid injection in the annulus, and the secondary segmented acidizing displacement, were presented. This technology has been applied in the AHDEB and HALFAYA oilfield, completing 296 wells acidizing treatments. The results demonstrated that the average acidizing volume decreased from 500-900m3 to 150m3 and production significantly increased.
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复杂碳酸盐岩油藏长分支水平井不均匀注酸技术:模拟、优化与实践
针对复杂碳酸盐岩储层水平段长(bb0 ~ 800m)、非均质性强的特点,提出了一种高效的不均匀配酸技术,解决了酸化效果规模大、经济困难的问题。以水平井产能建立阶段的损害剖面或稳产阶段的产液剖面为设计核心,在长段水平井中选择最佳注入点和注入段,以最小的酸量实现增产效果最大化。建立了复杂碳酸盐岩储层水平井模拟酸化转向不均匀损伤及酸蚀虫孔扩展定量分析的综合数学模型。提出了螺旋管整体或局部选择性注酸、环空惰性液体注入、二次分段酸化驱替等配套技术方法和策略。该技术已应用于AHDEB和HALFAYA油田,完成了296口井的酸化处理。结果表明,平均酸化量由500 ~ 900m3降至150m3,产量显著提高。
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