不连续隔夹层底水油藏水平井水淹特征及氮气抑水机理  

Horizontal Well Flooding Performance and Nitrogen Suppression Mechanism in Bottom-Aquifer Reservoir with Discontinuous Interlayers

作　　者：王泊[1] Wang Bo(Sinopec Henan Oilfield Company,Nanyang,Henan 473400,China)

机构地区：[1]中国石化河南油田分公司

出　　处：《特种油气藏》2019年第6期135-140,共6页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金“蒸汽+非凝析气热力泡沫在多孔介质中的运移及滞留机理”(51104165)

摘　　要：为了有效抑制河南GC油田不连续隔夹层底水油藏的水淹状况并改善开发效果,利用一维驱替模型研究了气水两相的渗流特征,通过二维可视化物理模拟技术开展了不连续隔夹层底水油藏水平井开发的水淹特征研究,并开展了氮气抑水增油机理的研究与分析。研究结果表明,水平井生产过程中,底水自夹层裂口处向水平段逐渐推进,形成辐射状的水淹剖面,水平井的入口端至中部为主要的水淹范围,形成较大的剩余油分布范围;氮气注入后,优先进入渗流阻力小的水淹区域,在重力分异作用下推水下移,同时氮气以分散状态存在,起到抑水增油的效果。现场应用进一步证明,注氮气具有抑水增油的效果。该研究对于分析不连续隔夹层底水油藏水淹规律及探索底水油藏适宜的治理措施具有重要的实践指导意义。In order to effectively suppress the flooding and improve the development performance of the bottom-aquifer reservoir with discontinuous interlayers in GC Oilfieldof Henan,the 1D displacement model was used to study the gas-water two phase seepage performance.The horizontal well flooding performance of bottom-aquifer reservoir with discontinuous interlayers were researched through 2D visual physical simulation technology.In addition,this research also provides an analysis on the nitrogen suppression mechanism.Result shows that the bottom-aquifer advances from the crack of interlayer to the lateral section,which leads to a radial flooding profile.The major flooding section is from the inlet end to the middle part of lateral section,which results in a large remaining oil distribution.The nitrogen preferentially flows into the flooded section with small flow resistance after injection.The water is displaced by the nitrogen under the effect of gravity differentiation,and the nitrogen shows a disperse state,which can suppress water and enhance oil recovery.Field application further proves the performance of water suppression and enhancing oil recovery.This research could provide certain practical guidance for analyzing the flooding performance and exploring suitable countermeasures of bottom-aquifer reservoir with discontinuous interlayers.

关 键 词：不连续隔夹层 底水油藏 水平井 氮气 物理模拟 可视化 

分 类 号：TE357.45[石油与天然气工程—油气田开发工程]