涪陵页岩气田微注入测试应用研究  

Application of pre-frac injection falloff diagnostic test in Fuling Shale gas field

作　　者：黄艺 HUANG Yi(Exploration&Development Research Institute of Jianghan Oilfield Company,SINOPEC,Wuhan,Hubei 430000,China)

机构地区：[1]中国石化江汉油田分公司勘探开发研究院,湖北武汉430000

出　　处：《石油地质与工程》2023年第1期116-120,共5页Petroleum Geology and Engineering

摘　　要：页岩气藏由于低孔低渗的特性,需采用水平井分段压裂的方式开采。地层压力、渗透率、破裂压力等地层参数是压裂施工设计的重要依据,涪陵页岩气田主要运用微注入压降测试获取地层参数。文中针对五峰组-龙马溪组的6井次微注入压降测试展开分析,利用G函数曲线判断地层漏失特性,并利用ACA、双对数曲线分析获得原始地层压力和有效渗透率。微注入压降测试需按照要求一次性完成,若中断后重新泵注,会导致解释的原始地层压力值偏高;微注入压降测试可以快速认识地层压力水平,对于无法开展静压测试的新区块较为实用。结果表明,涪陵页岩气田原始地层渗透率和静压系数值分区明显,1区与2区原始地层渗透率相近,且均高于3区;1区与2区接近常压气藏,3区与4区为高压气藏。Due to low porosity and low permeability, shale gas reservoirs need to be exploited by staged fracturing with horizontal wells.Formation parameters such as formation pressure, permeability and fracture pressure are important for fracturing construction design, and then the pre-frac injection falloff diagnostic test is carried out in Fuling shale gas field.By taking the analysis on 6 wells from Wufeng-Longmaxi formation, the G function curve is used to judge the formation leakage, and the original formation pressure and effective permeability have been obtained from ACA and double logarithmic curve analysis.It is noted that the test should be completed at one time as required.If the pump is re-injected after interruption, the interpreted original formation pressure will be higher.Besides, the test can be used for rapid assessment of shale reservoirs unable to perform static pressure test.Zoning characteristics show that the original formation permeability and static pressure coefficient values are obviously divided, the permeability of Zone 1 and 2 are similar, both higher than Zone 3.Zone 1 and 2 belong to normal pressure reservoirs, and Zone 3 and 4 are high-pressure gas reservoirs.

关 键 词：涪陵页岩气田 微注入压降测试 G函数分析 试井解释 

分 类 号：TE249[石油与天然气工程—油气井工程]