Overview and Practical Understanding of the Construction of Shale Oil Hydraulic Fracture Field Labs in the Ordos Basin
Drawing on the successful experience of HFTS in North America,Changqing Oilfield has planned the construction of HFFL in the third phase of hydraulic fracturing test site around the goal of further improving single well production.The I phase started in 2022 and completed in 2024.It is the first complete hydraulic fracturing test site in China.The first phase focuses on the interbedded shale oil Chang 71 and Chang 72 reservoirs,and the construction adheres to the research path of"pre-pressure geology-engineering integrated design,inversion fitting of pressure test response,and verification and analysis and evaluation of post-pressure coring",and comprehensively applies 10 16-well tests such as optical fiber,double-well microseismic,downhole television,tracer and coring,and systematically carries out fine evaluation of artificial fracture morphology,multi-cluster fracturing and fluid production contribution rate,etc.,and the main understandings include:①various types of underground fractures after shale oil pressure,A total of 431 fractures were found during the 300 m coring process,including 115 fracturing fractures and 239 bedding fractures.②The complexity of the fractures is far beyond expectations,the total number of artificial fractures is much greater than the number of clusters,and the local expansion is not strictly in accordance with the direction of the maximum principal stress,and the fractures are obviously deflected,communicated,and bent due to the comprehensive influence of lithology and natural fracture development.③The length and extension of hydraulic fractures are long,the overall height of the fractures is controlled,the proppant is widely distributed in the coring cuttings,and the support is also observed on the fracture surface.④ The multi-cluster fractureed at 100%,but the propagation process showed dynamic changes,the sand distribution was different,and the average uniformity index of optical fiber evaluation was 61.8%.⑤The long-term dynamic tracking of prenatal cesarean stage showed that after 6 months of production,the contribution of multi-fissure segment and high-quality dessert segment gradually became prominent.In summary,the hydraulic test site provides a more accurate and scientific theoretical supply for Changqing shale oil to re-understand the reservoir,re-understand the fracture-controlled reserves,re-understand the fracture and re-understand the production,which plays a very important role in the optimization of the well pattern,the formulation of development technology and the optimal design of volume fracturing,and also plays a demonstration and leading role in the construction of the domestic hydraulic fracturing test site.
Ordos Basinshale oilhydraulic fracturing test siteoptical fiber
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