水平井分段压裂多簇裂缝对套管受力的影响分析  

The Impact of Multi-Cluster Cracks on the Stress of Casing in Horizontal Wells

作　　者：韩家新[1] 曾顺鹏[2] 张相泉 袁彬[3] 徐春碧[2] 章哲宇 

机构地区：[1]中石化江汉石油工程有限公司,湖北潜江433100 [2]重庆科技学院石油与天然气工程学院,重庆401331 [3]西南石油大学石油工程学院,成都610500

出　　处：《重庆科技学院学报（自然科学版）》2016年第4期97-100,124,共5页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：国家科技重大专项"地应力及控缝高压裂技术研究"(2011ZX05014-006-004HZ);中石化重大专项"焦石坝丛式水平井组压裂技术研究与应用"(SG1312-01K);重庆市自然科学基金项目"页岩气勘探开发安全防护距离理论模型研究"(CSTC2013JCYJA90014)

摘　　要：针对套管强度设计要求越来越高的现状,建立了多簇裂缝诱导应力套管受力模型,模拟分析分段压裂对套管受力的影响。多簇裂缝间套管受到的径向应力和剪切应力最大。诱导应力叠加加大了套管的径向应力,增加了套管受力非均质性,使得其受到的剪切应力大大增加,增加了套管损坏的风险。水平井分段压裂井套管强度设计中,应特别考虑水力裂缝产生的叠加诱导应力的影响。With the higher design requirements for strength of casing, considering the induced stress of multi cluster crack, the casing stress model under the multi cluster crack induced stress is established, and the influence of the segmented fracturing on the casing is analyzed by using the model. The results show that： the radial stress and shear stress of the casing in the multi - cluster cracks is maximum. Induced stress of multiple clusters fractures superposition increases the radial stress of casing. The biggest radial stress ratio of casing comes out between two fractures. The stress superposition of multi cluster cracks increases the stress heterogeneity of the casing, and makes the shear stress increase greatly. The stress superposition of multi cluster cracks increases mainly radial stress and shear stress, especially shear stress, and the risk of damage to the casing is increased. The design of casing strength in horizontal well section fractured wells should be specially considered to the influence of the induced stress caused by the superposition of hydraulic fracture.

关 键 词：页岩气 水平井 裂缝簇 诱导应力 套管 复合地应力 

分 类 号：TE931[石油与天然气工程—石油机械设备]