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塔河缝洞型碳酸盐岩油藏复杂缝酸压技术研究
石油实验地质
2016年 38卷 第S1期
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Title
Acid fracturing for complex fractures in fractured-vuggy reservoirs in Tahe oil field
Authors
Yang Yuqin
Zhao Bing
Li Nan
He Xiaobo
Hu Wenting
单位
中国石化 西北油田分公司 石油工程技术研究院, 乌鲁木齐 830011
Organization
Research Institute of Engineering Technology, SINOPEC Northwest Company, Urumqi, Xinjiang 830011, China
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.
关键词：
缝洞型油藏;
酸压;
复杂缝;
裂缝延伸准则;
随机建模;
Keywords:
fractured-vuggy reservoir;
acid fracturing;
complex fracture;
fracture propagation criterion;
stochastic modeling;
DOI
https://doi.org/10.11781/sysydz2016S1145
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