螺旋射孔对水平缝水力压裂过程影响的数值模拟

doi:10.7623/syxb201206022

石油学报 ›› 2012, Vol. 33 ›› Issue (6): 1076-1079.DOI: 10.7623/syxb201206022

螺旋射孔对水平缝水力压裂过程影响的数值模拟

杨野 1,2　彪仿俊 1,3 　王瀚 3

1. 中国石油大学石油天然气工程学院北京 102249;2. 中国石油大庆油田有限责任公司采油工程研究院黑龙江大庆 163453; 3.中国科学技术大学近代力学系安徽合肥 230026

收稿日期:2012-05-19 修回日期:2012-08-14 出版日期:2012-11-25 发布日期:2012-12-07
通讯作者: 杨野
作者简介:杨野，男，1963年6月生，1987年毕业于大庆石油学院，现任中国石油大庆油田有限责任公司采油工程研究院院长、教授级高级工程师，主要从事采油、采气理论及工艺研究。
基金资助:
中国石油科技创新基金项目（2010D-5006-0209）资助。

A numerical study on effects of helical perforation on hydraulic fracturing of horizontal fractures

YANG Ye 1,2　 BIAO Fangjun 1,3 　WANG Han 3

Received:2012-05-19 Revised:2012-08-14 Online:2012-11-25 Published:2012-12-07

摘要/Abstract

摘要：

以非线性流固耦合方程为基础建立了射孔油井和地层的水力压裂三维计算模型，并模拟、讨论了常用螺旋射孔相位角对水平裂缝压裂的影响。数值模拟结果表明，在地应力方向不确切的情况下，采用螺旋射孔是一种有效降低裂缝起裂压力的技术措施。在裂缝扩展过程中，每个射孔都可能形成一条裂缝，但由于相邻射孔之间的距离很近，在井筒附近各条裂缝相互干扰严重，各条裂缝的形态差异很大;伴随着岩石破碎，各个射孔形成的裂缝相互贯通，逐渐融合成一条主裂缝。螺旋射孔对压裂的延伸压力和裂缝形态有相当程度的影响。

关键词: 三维有限元模型, 螺旋射孔, 定向射孔, 水平缝, 缝间干扰

Abstract:

A 3D fluid-solid coupling finite element model for hydraulic fracturing of oil wells with perforation and formations was established. Effects of different helical perforation phase angles on fracture evolution were simulated and studied. The result of numerical simulation demonstrates that helical perforation is an effective technique of reducing fracture initiation pressures when the direction of horizontal maximum stress is not confirmed. During fracture propagation each perforation may generate a fracture, however, different fractures can disturb each other seriously near wellbore because they are close to each other and their configurations are very different. Fractures connect together accompanied with rock fragmentation gradually to engender a main fracture. Helical perforation has a considerable effect both on fracture propagation and on final configuration. The present result is valuable for the design of horizontal fracture treatments.

Key words: 3D finite element model, helical perforation, orientated perforation, horizontal fracture, disturbance among fractures

杨　野彪仿俊王　瀚. 螺旋射孔对水平缝水力压裂过程影响的数值模拟[J]. 石油学报, 2012, 33(6): 1076-1079.

YANG Ye BIAO Fangjun WANG Han . A numerical study on effects of helical perforation on hydraulic fracturing of horizontal fractures[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(6): 1076-1079.

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螺旋射孔对水平缝水力压裂过程影响的数值模拟

A numerical study on effects of helical perforation on hydraulic fracturing of horizontal fractures

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