Acid fracturing for complex fractures in fractured-vuggy reservoirs in Tahe oil field
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摘要: 缝洞体是塔河油田油气的主要储集空间，通过酸压工艺沟通缝洞体是实现这类油藏高效开发的主要手段。侧钻井放空、漏失现象揭示在井周不同方位均发育缝洞体。由于酸压人工裂缝延伸方向主要受控于最大水平主应力方向，造成非主应力方向上的缝洞体沟通困难。增加酸压裂缝复杂程度是提高井周不同方位缝洞体沟通的有效措施。通过建立复杂天然裂缝条件下人工裂缝延伸模型，评价了不同岩石参数对裂缝复杂程度的影响：摩擦系数 > 水平应力差 > 逼近角 > 岩石抗张强度 > 内聚力。研究形成了复杂缝酸压配套工艺技术并开展5井次现场应用，平均单井增油5 909.7 t。Abstract: The main reservoir types in Ordovician carbonate formation in Tahe oil field are dissolution fractures and caves. Acid fracturing is one of the main methods of oil field development. Venting and leakage during sidetracking show that a lot of caves distributed nearby, but not connected to well because of single acid fracture extending direction. Increasing the complexity of acid fracturing may contribute to improve the probability of link between well and caves which distributed along different directions. A fracture extending compute model is proposed under the conditions of complex natural fracture. Different rock mechanic parameters which have influence on fracture's complexity are assessed:friction coefficient > horizontal stress difference > approximation angle > tensile strength > cohesion. Acid fracturing for complex fractures is applied in 5 wells, obtaining 5 909.7 t oil in average for each well.
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