海上低渗储层垂向跨度大、砂泥互层发育,若采用常规笼统压裂方法改造储层,多簇裂缝竞争起裂导致部分薄油层无法得到充分改造,压裂产量衰减快;若采用机械分层压裂,由于隔层封隔能力弱,易使储层压窜引起砂卡管柱,且海上压裂高投入、低产出矛盾突出。针对以上难题,采用基于地质工程双甜点的精细分簇技术对改造段进行射孔,通过缝口暂堵改善段内各簇孔眼的进液分布,优化暂堵参数，实现多簇裂缝均衡起裂,优选低伤害高温海水基压裂液降低储层伤害和海上用液成本,通过高频压力监测技术实时解释多簇压裂进液点,最终形成了适用于海上大跨度低渗砂泥互层的“精细分簇+暂堵匀扩+高频压力监测”多簇暂堵控流压裂技术。多簇暂堵控流压裂技术在海上首次应用取得了显著增产效果,产油量超100 m³/d,较常规笼统压裂井增产5倍。实施效果表明,多簇暂堵控流压裂技术可有效提高砂泥互层的簇间动用率和改造程度,为海上低渗储层经济有效开发提供有力的技术支撑。

The offshore low-permeability reservoirs feature a large vertical span and the development of thin interbedded layer. If the conventional general fracturing is adopted for reservoir transformation, the competition between multiple clusters of fractures can lead to inadequate transformation of some thin oil layers, resulting in rapid decay of fracturing production. If mechanical stratification is adopted, the weak sealing capability of the separator can lead to sand jamming in the strings due to reservoir breakthrough, and the contradiction between high input and low output is prominent. To address these challenges, the fine clustering technology based on geological and engineering dual dessert was used to perforate the transformation section. The fluid distribution into each cluster of orifices in the section was improved by temporary plugging at the fracture opening. By optimizing the temporary plugging parameters, the balanced initiation of multi-cluster fractures was realized. Low-damage, high-temperature seawater-based fracturing fluids are selected to reduce reservoir damage and offshore fluid costs. High-frequency pressure monitoring technology enables real-time interpretation of multi-cluster fracturing inlet points. Finally, the “fine clustering+temporary plugging and uniform expansion+high-frequency monitoring” multi-cluster temporary plugging and flow-controlled fracturing technology suitable for offshore low-permeability silty clay interbedded layer has been developed. The first application of this technology offshore has achieved the significant increase in production, with daily oil production of exceeding 100 m³/d, which is 5 times higher than that of conventional general fracturing wells. The implementation results show that the multi-cluster temporary plugging and flow-controlled fracturing technology can effectively improve the inter-cluster production rate and transformation degree of thin interbedded layer, providing robust technical support for the economic and effective development of offshore low-permeability reservoirs.