摘要
采用长岩心多点测压物理模拟实验新方法,在原始含水饱和度分别为30%、70%条件下,对常规空气渗透率分别为1.63×10^(-3)、0.58×10^(-3)、0.175×10^(-3)、0.063×10^(-3)μm^(2)的砂岩储层岩心样品开展了气藏衰竭开采物理模拟实验,记录实验过程中由近井到远井区域不同位置地层压力的变化特征,揭示了致密砂岩气藏储量动用规律,形成了含水致密砂岩气藏动用范围评价数学方法,建立了动用范围与储层渗透率、含水饱和度之间关系图版。结果表明:不同渗透率储层动用规律差异显著,对于1.63×10^(-3)μm^(2)的储层,动用范围非常大;对于常规空气渗透率为0.58×10^(-3)μm^(2)的储层,动用范围扩展速度较快,即使含水饱和度高达56.6%,废弃产量(初期配产的10%)下的动用范围也可以达到550 m,极限动用范围可达240 km,储量动用主要受砂体边界控制,动用范围内地层压力分布较为平缓;对于常规空气渗透率为0.063×10^(-3)μm^(2)的储层,动用范围由近井向外围扩展缓慢,即使含水饱和度仅为31.6%,废弃产量(初期配产的10%)下动用范围只有16 m,极限动用范围仅为2.1 km,且动用范围内地层压力分布呈现凹深漏斗形态,储量动用除了受砂体边界控制外,还会受到动用范围影响。该研究成果为类似气藏开发井网部署、加密调整等提供参考依据。
With the help of new physical simulating experiment method for the multi-point pressure test of the long core,a physical simulating experiment of gas-reservoir depletion production is carried out using sandstone reservoir core samples with conventional air permeability of 1.63×10^(-3)μm^(2),0.58×10^(-3)μm^(2),0.175×10^(-3)μm^(2)and 0.063×10^(-3)μm^(2) respectively under the conditions of 30%and 70%original water saturations.During the experiment,the variation characteristics of formation pressure in different positions from near well to far well are recorded,revealing the reserves producing law of the tight sandstone gas reservoir,and the mathematics method of evaluating the developed range of water-bearing tight sandstone gas reservoir is developed,and at last the relationship charts between producing range,reservoir permeability and water saturation were established.The results show that the producing rules of the reservoir with different permeabilities are obviously different for the reservoir with the permeability of 1.63×10^(-3)μm^(2),the producing scope is wide;for the reservoir with conventional air permeability of 0.58×10^(-3)μm^(2),the producing scope is expanded rapidly and is 550 m for the abandonment production(10%of the initial allocated production)when the water saturation is as high as 56.6%,and the limit producing range can reach 240 km,whose reserves producing is mainly controlled by the boundary of the sandbody with relatively gentle of formation pressure distribution in the developed range;for the reservoir with conventional air permeability of 0.063×10^(-3)μm^(2),the producing range are expanded slowly from near well to outside,even if the water saturation is 31.6%,the producing range for abandoned production(10%of the initial allocated production)is only 16 m and 2.1 km for the limit producing range,among which the distribution of formation pressure is a deep funnel,the reserves producing is controlled by the boundary of sandbody and affected by the producing scope.The study res
作者
胡勇
焦春艳
王继平
肖红林
梅青燕
陈颖莉
谢坤
罗皓
郭长敏
HU Yong;JIAO Chunyan;WANG Jiping;XIAO Honglin;MEI Qingyan;CHEN Yingli;XIE Kun;LUO Hao;GUO Changmin(PetroChina Research Institute of Exploration and Development, Beijing 100083, China;Changqing Oilfield Company of PetroChina,Xi’an 710018, China;PetroChina Southwest Oil & Gas Field Company, Chengdu 610051,China;MOE Key Laboratory of Enhancing Oil and Gas Recovery, Northeast Petroleum University, Daqing 163318, China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2021年第4期154-161,共8页
Petroleum Geology & Oilfield Development in Daqing
基金
国家科技重大专项“致密砂岩气有效开发评价技术”(2011ZX05013-002)
国家自然科学青年科学基金项目“致密砂岩微纳米孔喉系统对储层含气性及气水运移的控制机理”(51704326)。
关键词
致密砂岩
含水
气藏储量
动用规律
实验研究
tight sandstone
water bearing
gas reservoir reserves
producing law
experimental research
