水平井多段压裂多裂缝扩展形态计算方法

doi:10.13722/j.cnki.jrme.2015.1365

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摘要为解决水平井多段压裂多裂缝扩展形态问题，基于位移不连续边界元法建立三维裂缝应力场计算模型，并结合裂缝的不同边界条件和亚临界裂缝扩展模型，给出多裂缝扩展形态计算方法。通过与UFM模型对比，验证方法可靠性。根据该算法，研究不同压裂方式、不同缝间距与缝高、不同净压力与主应力差的多裂缝扩展形态，结果表明：对于多段单簇压裂，后续压裂缝会靠近或远离已压开流体内压缝，而已压开支撑剂充填裂缝对后续压裂缝扩展轨迹影响较小；多簇压裂外侧裂缝为主扩展裂缝，中间裂缝扩展长度减小；对于早先压裂缝为流体内压缝的情况，缝间距与缝高的比值不仅影响裂缝偏转角度，还影响裂缝偏转方向；对于两簇同时扩展的情况，缝间距与缝高的比值越小，或净压力与主应力差的比值越大，裂缝发生偏转的角度越大；对于多簇压裂方式，增大缝间距与缝高的比值有利于多簇裂缝的均匀延伸，而改变净压力与主应力差的比值并不能改变各簇缝长的分布情况。

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	陈铭1
	胥云2
	3
	翁定为2
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关键词 ：岩石力学, 多段压裂, 多裂缝, 位移不连续法, 应力干扰, 扩展形态, 计算模型

Abstract：For the issue of multi-fracture geometry by multi-stage fracturing in horizontal wells，a multi-fracture propagation-path algorithm was proposed，by incorporating a 3D-fracture stress field calculation model based on displacement discontinuity method，different fracture boundary conditions and subcritical fracture growth law. The algorithm was validated by UFM. Multi-fracture propagation paths for multi-stage fracturing in horizontal wells were investigated by the algorithm，and the results show that later fractures curve toward or away from previous pressurized fractures，while later fractures keep straight paths affected by sand-filled fractures. The exterior fractures propagate dominantly，but the inner fractures were suppressed due to stress shadow effect. Later fractures deviate toward the previous pressurized fracture when the ratio of fracture spacing to fracture height is less than one，and the smaller the ratio，the larger the deviation angle，otherwise they deviate away from the previous pressurized fracture or propagate straightly. The smaller the ratio of fracture spacing to fracture height，or the larger the ratio of net pressure to principle stress difference，the larger the deviation angle for two simultaneous- propagation fractures. Increasing the ratio of fracture spacing to fracture height promotes uniform fracture-length distribution，while changing the ratio of net pressure to principle stress difference can not change fracture-length distribution for multi-fractures by multi-cluster fracturing.

Key words： rock mechanics multi-stage fracturing multiple fractures displacement discontinuity method stress interference propagation path calculation model

引用本文:

陈铭1，胥云2，3，翁定为2，3. 水平井多段压裂多裂缝扩展形态计算方法[J]. 岩石力学与工程学报, 2016, 35(S2): 3906-3915.
CHEN Ming1，XU Yun2，3，WENG Dingwei2，3. Calculation method for multi-fracture propagation geometry of multi-stage fracturing in horizontal wells. , 2016, 35(S2): 3906-3915.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.1365 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/3906

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