Hydraulic fracturing initiation and near-wellbore nonplanar propagation from horizontal perforated boreholes in tight formation
Hydraulic fracturing initiation and near-wellbore nonplanar propagation from horizontal perforated boreholes in tight formation
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致密地层中水平射孔钻孔的水力压裂启动和近井筒非平面扩展
DOI：
10.1016/j.jngse.2018.05.021
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发表时间：
2018-07
影响因子：
--
通讯作者：
Hou B
中科院分区：
文献类型：
--
作者：
Zhang Ruxin;Hou Bing;Shan Qinglin;Tan Peng;Wu Yue;Gao Jie;Guo Xiaofeng;Hou B
致密地层在中国地区储量丰富，具有很高的经济开发价值。射孔压裂具有低渗透、低孔隙度、高密度等特点，导致裂缝压力高、裂缝扩展受限、裂缝几何形状复杂，需要广泛应用于这些油层的开发。要解决这些问题，必须了解和描述不同施工条件下的裂缝扩展机理。为此，在大量三轴水力压裂模拟实验的基础上，研究了不同射孔参数(射孔密度、射孔长度、射孔直径、射孔相位、射孔间距)和不同水平应力对比对致密地层射孔水平井裂缝几何形状、起裂和扩展的影响。实验中观察到三种类型的裂缝形态：一次射孔或连通性好的多次射孔可形成单一平坦裂缝，大射孔直径或高射孔密度可形成螺旋形裂缝，高射孔阶段可形成多条平行裂缝。此外，每种裂缝类型都有与裂缝曲线形状相对应的一定的压力行为。当射孔与最大水平应力的夹角较小时，射孔有可能发生，起裂位置很可能在射孔的底部。很难预测射孔的起爆顺序，但通过卸压剖面可以保证第一次起始射孔。此外，水平应力对比值越高，起始射孔越多，破裂压力越低，破裂时间越短。最终，在致密地层中选择大射孔直径、高射孔密度和60°射孔阶段的低破裂压力和简单的裂缝几何形状进行压裂。
Tight formations, which are rich in reserves in China, have a high economic development value. Perforated fracturing would need to be used widely to exploit these formations because of reservoir characteristics such as low permeability, low porosity and high density, resulting in high fracture pressure, limited fracture propagation, and complex fracture geometry. To address these issues, the mechanism of fracture propagation under different construction conditions must be understood and described. Therefore, the effect of different perforation parameters (shot density, shot length, shot diameter, shot phase, and shot interval spacing) and different horizontal stress contrasts on fracture geometry, initiation, and propagation from perforated horizontal wells in tight formations is studied based on numerous triaxial hydraulic fracturing simulation experiments. Three types of fracture geometry are observed in these experiments: A single flat fracture can be created by an initiated perforation or more initiated perforations with good connectivity, spiral-shaped fractures are generated by a large perforation diameter or high perforation density, and multiple-parallel fractures are induced by a high perforation phase. Moreover, each fracture type has certain pressure behaviors corresponding to a fracture curve shape. The perforations are likely to initiate when the angle between the perforation and maximum horizontal stress is small, and the initiation position is most likely at the base of the perforation. It is difficult to predict the initiation order of perforations; however, the first initiated perforation can be ensured by the profile of the relief pressure. In addition, a higher horizontal stress contrast value results in more initiated perforations, lower fracture pressure, and shorter breakage time. Ultimately, a large perforation diameter, high perforation density, and perforation phase of 60° should be chosen for fracturing at low fracture pressure and simple fracture geometry in tight formations.
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DOI：
10.2118/151585-ms
发表时间：
2012
期刊：
--
影响因子：
--
作者：
O. Alekseenko;Dmitry Ivanovich Potapenko;S. Cherny;D. Esipov;Dmitry Kuranakov;V. Lapin
通讯作者：
O. Alekseenko;Dmitry Ivanovich Potapenko;S. Cherny;D. Esipov;Dmitry Kuranakov;V. Lapin
影响因子：
6.2
作者：
W. Ge;Mian Chen;Yan Jin;Fuxiang Zhang;Yunhu Lu;P. Yang;Ji-hui Ding;Hao Zeng
通讯作者：
W. Ge;Mian Chen;Yan Jin;Fuxiang Zhang;Yunhu Lu;P. Yang;Ji-hui Ding;Hao Zeng
影响因子：
--
作者：
Mofazzal Hossain;Md Mamunur Rahman;S. Rahman
通讯作者：
Mofazzal Hossain;Md Mamunur Rahman;S. Rahman
影响因子：
7.5
作者：
B. Hou;Mian Chen;Zhimeng Li;Yonghui Wang;Ce Diao
通讯作者：
B. Hou;Mian Chen;Zhimeng Li;Yonghui Wang;Ce Diao
DOI：
10.2118/18982-ms
发表时间：
1989
期刊：
The Korean Journal of Crop Science
影响因子：
--
作者：
C. Veeken;D. Davies;J. Walters
通讯作者：
C. Veeken;D. Davies;J. Walters