钻孔
穿孔
断裂(地质)
地质学
分布式声传感
井筒
水力压裂
完井(油气井)
覆岩压力
石油工程
光纤传感器
岩土工程
材料科学
纤维
复合材料
冲孔
作者
Ge Jin,Gustavo Ugueto,Magdalena Wojtaszek,Artur Guzik,Dana Jurick,Kinzo Kishida
出处
期刊:Spe Journal
[Society of Petroleum Engineers]
日期:2021-04-09
卷期号:26 (05): 3255-3264
被引量:37
摘要
Summary The characteristics of hydraulic fractures in the near-wellbore region contain critical information related to the production performance of unconventional wells. We demonstrate a novel application of a fiber-optic-based distributed strain sensing (DSS) technology to measure and characterize near-wellbore fractures and perforation cluster efficiency during production. Distributed fiber-optic-based strain measurements are made based on the frequency shift of the Rayleigh scatter spectrum, which is linearly dependent on strain and temperature changes of the sensing fiber. Strain changes along the wellbore are continuously measured during the shut-in and reopening operations of a well. After removing temperature effects, extensional strain changes can be observed at locations around the perforation cluster during a shut-in period. We interpret that the observed strain changes are caused by near-wellbore fracture aperture changes caused by pressure increases within the near-wellbore fracture network. The depth locations of the measured strain changes correlate well with distributed acoustic sensing (DAS) acoustic intensity measurements that were measured during the stimulation of the well. The shape and magnitude of the strain changes differ significantly between two completion designs in the same well. Different dependencies between strain and borehole pressure can be observed at most of the perforation clusters between the shut-in and reopening periods. We assess that this new type of distributed fiber-optic measurement method can significantly improve understanding of near-wellbore hydraulic fracture characteristics and the relationships between stimulation and production from unconventional oil and gas wells.
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