Study on fracture initiation pressure and fracture starting point in deviated wellbore with perforations

doi:10.7623/syxb200701029

Editorial office of ACTA PETROLEI SINICA ›› 2007, Vol. 28 ›› Issue (1): 139-142.DOI: 10.7623/syxb200701029

• Petroleum Engineering • Previous Articles Next Articles

Study on fracture initiation pressure and fracture starting point in deviated wellbore with perforations

Luo Tianyu¹, Guo Jianchun², Zhao Jinzhou², Wang Jiahuai¹, Pan Jingjun¹

1. Research Institute of Oil Production Technology, Xinjiang Petroleum Administration, Karamay 834000, China;
2. State Key Laboratory for Oil-Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University, Chengdu 610500, China

Received:2006-01-02 Revised:2006-04-03 Online:2007-01-25 Published:2010-05-21

斜井套管射孔破裂压力及起裂位置研究

罗天雨¹, 郭建春², 赵金洲², 王嘉淮¹, 潘竞军¹

1. 新疆石油管理局采油工艺研究院新疆克拉玛依 834000;
2. 西南石油大学"油气藏地质及开发工程"国家重点实验室四川成都 610500

作者简介:罗天雨,男,1973年3月生,1996年毕业于西南石油学院钻井专业,现在新疆石油管理局博士后工作站工作,研究方向为油气藏增产措施与技术.E-mail:lty293@163.com
基金资助:
四川省青年科技基金项目(04ZQ026-052)资助.

Abstract

Abstract: There are some lacks in the former models for calculating fracture initiation pressure and fracture starting point in deviated wellbore with perforations.On the basis of the stress field in the intersection between drilling hole and perforations,the calculating models for transverse stress,fracture initiation pressure and fracture starting point at the intersection of two perforated holes existing Micro-Annulus plane were analyzed.In order to estimate the turning degree of fractures,the models for calculating angle between fracture initiation plane and the perfect hydraulic fracture plane are presented.A calculation example is given.

Key words: deviated wellbore, fracturing, fracture initiation pressure, fracture starting point, transverse stress, turning angle, calculation

摘要： 针对以往斜井压裂破裂压力计算中存在的问题,根据套管射孔斜井中钻井井眼与射孔孔眼相交处的应力状态,研究了射孔孔边切应力的计算方法,并分析了存在微环面时的两孔相交处的应力场、破裂压力及起裂方位的计算方法以及环空胶结严密时两孔相交处破裂压力的计算方法.利用空间几何知识,推导出了裂缝起裂平面与理想平面夹角及用于判断裂缝的转向程度的计算公式,并给出了计算实例.

关键词: 斜井, 压裂, 破裂压力, 起裂位置, 切应力, 转向角度, 计算方法

CLC Number:

TE357.1

Luo Tianyu, Guo Jianchun, Zhao Jinzhou, Wang Jiahuai, Pan Jingjun. Study on fracture initiation pressure and fracture starting point in deviated wellbore with perforations[J]. Editorial office of ACTA PETROLEI SINICA, 2007, 28(1): 139-142.

罗天雨, 郭建春, 赵金洲, 王嘉淮, 潘竞军. 斜井套管射孔破裂压力及起裂位置研究[J]. 石油学报, 2007, 28(1): 139-142.

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Study on fracture initiation pressure and fracture starting point in deviated wellbore with perforations

斜井套管射孔破裂压力及起裂位置研究

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