摘要
针对含水砂岩气藏储量动用规律认识不清这一难题,采用长岩心多点测压物理模拟实验方法及装置,选用渗透率分别为0.047×10^(−3)μm^(2)、0.064×10^(−3)μm^(2)、0.154×10^(−3)μm^(2)、0.175×10^(−3)μm^(2)、0.602×10^(−3)μm^(2)、1.74×10^(−3)μm^(2)6个渗透率级别天然基质岩心,开展了含水饱和度分别为0%、30%、40%、50%、60%、70%左右条件下系列衰竭开采物理模拟实验,研究了储层基质渗透率和含水饱和度大小对储层瞬时产气量、压降波及特征,以及不同开发阶段(稳产期末、废弃条件和极限条件)储量动用程度(R)的影响。结果表明:①储层基质产气能力和储量动用程度受储层基质渗透率和含水饱和度双重控制,但在气藏开发不同阶段其敏感界限值不同,应高度关注开采过程中不同渗透率储层的含水饱和度变化特征,尽可能要将含水饱和度控制在临界值范围内才能实现有效动用;②依据废弃条件下储量动用程度特征图,以储量动用程度分别为60%和80%对应的储层渗透率和含水饱和度为指标,构建了一套储量动用分级评价界限图版,划分出优先动用、条件动用、潜力动用3个层级,明确了各层级对应的储层参数界限,可为现场优质储层优先和确定储量动用序列提供前瞻性指导。
To address the difficult problem of poor understanding of the reservoir mobilization law of water-bearing sandstone gas reservoirs,a multi-point piezometric physical simulation experiment method and apparatus were used for long cores.Six natural matrix cores with permeability levels of 0.047,0.064,0.154,0.175,0.602,and 1.74×10^(−3)μm^(2) were selected,and a series of physical simulation experiments of depletion extraction were conducted under the conditions of water content saturation of about 0%,30%,40%,50%,60%,and 70%,respectively.The effects of reservoir matrix permeability and water saturation on the instantaneous gas production,pressure drop curve and characteristics of the reservoir,as well as the degree of reserve utilization(R)at different development stages(end of steady production,abandonment conditions and ultimate conditions)were investigated.The results show that:(1)the gas production capacity of reservoir matrix and the degree of reservoir utilization are controlled by both reservoir matrix permeability and water content saturation,but the sensitive threshold value is different in different stages of gas reservoir development.(2)Based on the characteristic diagram of the degree of utilization under the abandoned condition,a set of reserve utilization classification evaluation boundary map is constructed with the reservoir permeability and water content saturation corresponding to 60%and 80%of the reservoir utilization degree respectively as the indexes,and three levels of priority utilization,conditional utilization and potential utilization are divided,and the reservoir parameters corresponding to each level are clearly defined,which can provide prospective guidance for prioritizing and determining the sequence of reservoir utilization for high-quality reservoirs in the field.
作者
江良冀
王国锋
胡勇
王继平
李忠诚
焦春艳
郭世超
郭长敏
陈璐瑶
JIANG Liangji;WANG Guofeng;HU Yong;WANG Jiping;LI Zhongcheng;JIAO Chunyan;GUO Shichao;GUO Changmin;CHEN Luyao(PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;PetroChina Qinghai Oilfield Company,Dunhuang 736202,China;CNPC Key Laboratory of Oil&Gas Underground Storage Engineering,Langfang 065007,China;PetroChina Changqing Oilfield Company,Xi'an 710018 China;Exploration and Development Research Institute of PetroChina Jilin Oilfield Company,Songyuan 138000,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2023年第7期1137-1145,共9页
Natural Gas Geoscience
基金
中国石油重大科技专项“水驱碎屑岩气藏剩余气分布规律与提高采收率方法研究”(编号:2022KT0904)
“水侵气藏提高采收率及低丰度复杂气藏开发技术研究”(编号:2021DJ1705)联合资助.
关键词
含水砂岩气藏
储量动用
分级评价
实验研究
物理模拟
Water-bearing sandstone gas reservoir
Reservoir mobilization
Graded evaluation
Experimental study
Physical simulation
