天然气工业2017，Vol.37Issue(8)：40-47,8.DOI:10.3787/j.issn.1000-0976.2017.08.005
四川盆地上震旦统灯四段气藏提高单井产量的技术措施
Technological measures for improving single-well productivity of gas reservoirs of Upper Sinian Deng 4 Member in the Sichuan Basin
摘要
Abstract
In the fourth member of Upper Sinian Dengying Fm (Deng 4 Member) in the Sichuan Basin,there are various types of reservoirs with strong heterogeneity,and the early exploratory wells are poorly developed.Therefore,it is in urgent need to research and develop stimulation technologies and measures suitable for different types of reservoirs so as to increase single-well productivity.In this paper,an optimization study was carried out in five aspects,and technical measures were put forward correspondingly.First,according to the analysis on the correlation between the productivity and the reservoir characteristics and fracture-vug development degree,it was proposed to drill deviated wells dominantly in Deng 4 Member and give consideration to the effective production of reserves of vertical layers.Second,the integrated string of stimulation-well completion-production was adopted for reservoir stimulation to reduce reservoir damage and improve well test efficiency.Third,sufficient consideration was given to borehole wall stability,reservoir stimulation and the damage to reservoirs before open hole completion suitable for reservoirs with developed fractures and vugs and perforated completion suitable for porous reservoirs were performed.Fourth,based on acid/rock reaction experiment results and the etch forms of etched fractures,it is determined to take high-temperature gelling acid as the host acid and self-generating acid prepad as the host prepad fluid for in-depth acid fracturing.And fifth,on the basis of reservoir characteristics,it is recommended to apply retarded acid fracturing in fracture-vug reservoirs,prepad acid fracturing in pore-vug reservoirs and complex fracture net based acid fracturing in porous reservoirs.These measures are practically taken at 31 wells and their single-well natural gas production rates measured at the wellhead average 68.33 × 104 m3/d,which is 22.85× 104 m3/d higher than those of early exploration wells.关键词
四川盆地/晚震旦世/储集层/类型/井型/完井方式/储层改造/工作液/分段酸化/天然气产量Key words
Sichuan Basin/Late Sinian/Reservoir/Type/Well type/Well completion system/Reservoir stimulation/Working liquid/Staged acidizing/Natural gas production rate引用本文复制引用
韩慧芬..四川盆地上震旦统灯四段气藏提高单井产量的技术措施[J].天然气工业,2017,37(8):40-47,8.基金项目
中国石油天然气股份有限公司重大科技专项“四川盆地深层高温高压含硫气藏储层改造技术研究与应用”(编号:2016E-0609). （编号:2016E-0609）
