Aiming at the contradictions and challenges in the development of low permeability reservoirs in offshore oilfields,taking oilfield A as the target,spacing between injection and production wells,number of fractures generated,spacing between fractures,and fracture half length were all optimized.Research on the feasibility of using the same tubing for both fracturing operation and flowing production,continuous mixing of fracturing fluid,and high performance proppants was conducted.Based on the work above and by applying double safety control system,multistage fracturing technology was for the first time pilot tested in horizontal wells in offshore low permeability reservoirs.The test made the first breakthrough in the operation scale—"1 000 m3 of liquid,100 m3 of proppant".Upon fracturing the natural flow production reached 120 m3/d,so it was very successful.The work here provides a new mode for the development of offshore low permeability reservoirs.%针对海上低渗透油田开发面临的矛盾和挑战,以A油田为目标,通过设计优化注采井井距、压裂裂缝条数、裂缝间距、裂缝半长等参数,研究压裂+自喷生产一体化管柱、连续混配压裂液和高性能支撑剂等多级压裂工艺,应用双安全控制系统,在海上低渗透油田首次成功实施了水平井多级压裂技术先导试验取得了首次突破“千方液、百方砂”的压裂规模,压裂后自喷产量达到120 m3/d,为海上低渗油田开发提供了新模式.
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