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油井压裂后，随着开发生产的延续，裂缝由于受污染、堵塞、挤压等因素的影响，其导流能力逐渐降低，从而失去压裂的增油效果，在油层能量和储量没有得到充分发挥的情况下，需进行重复压裂。根据胜利五号桩油田桩７４块南区特低渗、高凝固点、高温异常、超深、且第一次压裂后初产高、递减快的油藏特点，对８口经过第一次压裂井的有效渗透率、岩石杨氏模量、泊松比、地应力剖面、地层能量和剩余可采储量进行了客观的评价，认为具备重复压裂的条件。用ＤＳＴ试井、水力压裂模拟和油藏数值模拟方法计算了原裂缝的几何形态，评价了导流能力。确定了桩７４块南区重复压裂选井选层的原则，筛选了重复压裂的压裂液和支撑剂，设计出了重复压裂方案，并优选出最优裂缝支撑半长在１１０～１２９ｍ之间。按设计方案施工，取得了良好的增油效果，裂缝导流能力较第一次压裂提高了４倍，生产１３３ｄ后，净收益达到１６６．９万元。
After oil well fracturing, with the continuation of development and production, due to the influence of pollution, blockage and extrusion, the diversion ability of fractures gradually decreases, thereby losing the effect of oil increase by fracturing. When the energy and reserves of fractures are not fully obtained In case of play, repeated fracturing is required. According to the characteristics of the reservoir of Shengli Wuzhuang Oilfield, pile 74 in South Area with extra-low permeability, high freezing point, high temperature anomaly and ultra-deep, and with high initial production and declining rate after the first fracturing, The effective permeability of fractures, rock Young’s modulus, Poisson’s ratio, geostress profile, formation energy and residual recoverable reserves were objectively evaluated, and the condition of repeated fracturing was considered. DST well test, hydraulic fracturing simulation and reservoir numerical simulation method to calculate the original fracture geometry, to assess the diversion capabilities. The principle of re-fracturing well selection in South Block 74 was determined. The fracturing fluid and proppant with repeated fracturing were screened out and the scheme of repeated fracturing was designed. The optimal fracturing half- Between 129m. According to the design scheme, a good effect of oil increase was achieved. The fracture diversion capacity increased by 4 times compared with the first fracturing. After 133 days of production, the net income reached 1,669,000 yuan.