致密砂岩气藏多层合采气水交互越流模拟实验  

Simulation experiment on the gas-water interaction crossflow during the multi-layer commingled production of tight sandstone gas reservoirs

作　　者：李奇 高树生[3] 刘华勋[3] 叶礼友[3] 安为国[3] 刘广昊 LI Qi;GAO Shusheng;LIU Huaxun;YE Liyou;AN Weiguo;LIU Guanghao(University of Chinese Academy of Sciences,Beijing 100190,China;Institute of Porous Flow&Fluid Mechanics,Chinese Academy of Sciences,Langfang,Hebei 065000,China;Department of Porous Flow&Fluid Mechanics,PetroChina Research Institute of Petroleum Exploration&Development,Langfang,Hebei 065000,China;No.1 Oil Production Plant,PetroChina Huabei Oilfield Company,Renqiu,Hebei 062552,China)

机构地区：[1]中国科学院大学 [2]中国科学院渗流流体力学研究所 [3]中国石油勘探开发研究院渗流所 [4]中国石油华北油田公司第一采油厂

出　　处：《天然气工业》2022年第1期133-145,共13页Natural Gas Industry

基　　金：国家自然科学基金项目“超深层天然气开发基础理论研究”(编号:U1762216);中国石油天然气股份有限公司前瞻性基础性研究项目“复杂天然气田开发关键技术研究”(编号:2021DJ17)。

摘　　要：鄂尔多斯盆地苏里格致密砂岩气是中国石油长庆油田公司天然气开发的核心对象,由于有效砂体规模小、储层非均质性强、物性致密,长期以来被誉为“磨刀石上闹革命”。为了解决苏里格致密砂岩气藏直井多层合采时普遍产水的复杂渗流问题,基于苏里格致密砂岩气藏砂体纵向叠置类型分析,突破常规多层合采实验方法,设计了复杂气藏双层流动多点测压衰竭开发实验流程,建立不同开发方式下气、水层间可交互越流的双层开发动态物理模拟实验。研究结果表明:①致密砂岩气水层交替叠置型气藏在多层合采过程中,普遍存在层间气水交互越流现象;②储集层纵向非均质性、含水饱和度以及开发方式是影响层间两相交互越流最主要的因素,直接影响气藏采收率;③多层合采的高含水层(60%<S_(w)<100%)与气层渗透率比值越大,生产中后期层间干扰对气藏生产的抑制作用越强,需采取相应的调整措施;④低渗气层与致密水层(渗透率小于0.1mD)合采时,未见严重的水窜越流现象,对气藏整体采收率影响较小,易实现气藏高效开发。结论认为,模拟实验研究成果为苏里格致密气高效开发提供了新思路和新技术,对提高致密气藏采收率具有重要现实意义,为其他致密气田高效开发具有借鉴意义。The tight sandstone gas in Sulige of the Ordos Basin is the core object of natural gas development in PetroChina Changqing Oilfield, and it has been known as the "revolution on the grindstone" for a long time due to the small size of effective sandbody, strong reservoir heterogeneity and tight physical property. In order to solve the problem of complex seepage that water production is common during the multi-layer commingled production of Sulige tight sandstone gas reservoir by horizontal wells, this paper analyzes the vertical superimposition types of sandbodies in Sulige tight sandstone gas reservoir. Based on this, the conventional experimental method of multi-layer commingled production is broken through, and the experimental procedure for the depletion development of complex gas reservoir with double-layer flow and multi-point pressure measurement is designed. In addition, a dynamic physical simulation experiment for the double-layer development with gas-water interaction crossflow under different development modes is developed. And the following research results are obtained. First, the phenomenon of gas-water interaction crossflow between layers is common during the multi-layer commingled production of the tight sandstone gas reservoir with gas layers interactively superimposing with water layers. Second, vertical reservoir heterogeneity, water saturation and development mode are the most important factors influencing the two-phase interaction crossflow between layers, which directly affect the recovery rate of gas reservoir. Third, the permeability ratio of high water cut layer (60%<S_(w)<100%) to gas layer is higher during the multi-layer commingled production, and the inhibitory effect of inter-layer interference on gas reservoir production gets stronger in the middle and late stages of production, so it is necessary to take the corresponding treatment measures. Fourth, when a low-permeability gas layer and a tight water layer (permeability<0.1 mD) are coproduced, no serious water channeling is observed

关 键 词：鄂尔多斯盆地 苏里格 致密砂岩气藏 气、水层合采 渗流规律 层间越流 气水交互 

分 类 号：TE37[石油与天然气工程—油气田开发工程]