摘要
红河油田长8致密砂岩油藏启动压力梯度大,油井技术极限井距小,必须对储层进行压裂改造才能提高单井控制储量。由于长8储层普遍发育裂缝,天然裂缝、压裂人工缝的综合作用增加了油井井距的确定难度。首先通过实验测定启动压力梯度,建立启动压力梯度与渗透率的关系,确定基质储层区油井技术极限井距;其次考虑储层裂缝发育程度,总结矿场经验,综合确定油井合理井距。
Because the high threshold pressure gradient of the Triassic Chang 8 tight sand- stone reservoirs in Honghe oilfield, technology critical well spacing was small, reservoir frac- turing was the only way to improve single well controlled reserves. Natural fractures were developed widely in Chang 8 reservoir, natural fractures and compression fractures increased the difficulty in determining the well spacing. The observed start-up pressure gradient was derived through processing experimental data, the power function of start-up pressure gradi- ent and permeability was obtained, which was could be used to calculate the technology critical well spacing. On this basis, the development of reservoir fracture and mine experi- ences were also considered to determine the reasonable well spacing in Honghe oilfield tight sandstone reservoirs.
出处
《石油化工应用》
CAS
2015年第9期48-50,共3页
Petrochemical Industry Application
关键词
致密砂岩油藏
启动压力梯度
技术极限井距
tight sandstone reservoirs
threshold pressure gradient
technology critical wellspacing
