Volume fracturing technology for tight sandstone reservoir stimulation in Liushagang Formation in Hainan
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摘要: 福山凹陷流沙港组致密砂岩是海南福山油田勘探开发的重要目标之一。受复杂构造演化影响，该区致密砂岩具有砂泥薄互层明显、低孔低渗、高温等特征，为了解决以往储层改造中经常出现的施工压力高、缝高失控、砂堵、单井产量低、压裂后产量下降快等问题。借鉴非常规体积压裂技术，采用变排量、人工隔层控缝高、暂堵转向等工艺，同时进一步优化压裂液，应用纳米增效洗油剂，在福山油田致密砂岩开展了4口井次试验。研究结果表明：非常规体积压裂技术可有效降低砂堵风险，提高福山油田致密砂岩储层的改造效果。变排量、人工隔层控缝高、暂堵转向压裂等储层改造工艺的实施，有效控制了缝高，提高了储层的压开程度。纳米增效洗油剂的应用，最大限度地降低了液体对地层和裂缝的伤害，发挥了纳米液滴渗吸洗油作用，增加了油气井的稳产期。Abstract: The tight sandstone of Liushagang Formation is one of the important targets for the exploration and development of the Fushan Oilfield in Hainan. Affected by complex structural evolution， the tight sandstone in this area has the characteristics of obvious thin interbedded sand and mud， low porosity， low permeability， and high temperature. In order to solve the problems such as high operation pressure， out-of-control fracture height， sand plugging， and low single well output and rapid output decline after fracturing in the past reservoir treatment， drawing on the unconventional reservoir volume fracturing technology， tests were conducted in four wells in the tight sandstone of Fushan Oilfield with the use of variable displacement and artificial barriers to control fracture heights， temporary plugging for fracture direction change， as well as optimization of fracturing fluids， and application of nano-synergy oil washing agents. The research results show that unconventional reservoir volume fracturing technology can effectively reduce the risk of sand plugging and improve the stimulation effect of tight sandstone reservoirs in Fushan Oilfield. The implementation of reservoir reconstruction techniques such as variable displacement， artificial barriers to control fracture heights， and temporary plugging for fracture direction change have effectively controlled fracture heights and increased the open degree of the reservoir. The application of the nano synergistic oil washing agent minimizes the damage of the liquid to the formation and fractures， exploits the effect of nano droplets to absorb and wash oil， and increases the stable production period of oil and gas wells.
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