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首页> 外文会议>SPE Trinidad and Tobago Section Energy Resources Conference >The Casing Deformation During Shale Gas Hydraulic Fracturing: Why it is so Serious in Weiyuan-Changning,China?
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The Casing Deformation During Shale Gas Hydraulic Fracturing: Why it is so Serious in Weiyuan-Changning,China?

机译：页岩气体液压压裂过程中的套管变形：为什么在中国魏源改造中是如此严重？

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Casing deformation turned out to be serious during hydraulic fracturing of shale gas wells in Weiyuan-Channing,where the ratio of casing deformation was more than 30%.Nevertheless,there were no such phenomenon in America and other shale gas producing areas.Why there were so many horizontal wells casing deformation in Weiyuan-Changning,China? There maybe kinds of factors.The authors mainly analyze the effect to casing deformation from operations factors during well drilling and completion,including dogleg angle,loss of cement sheath integrity and APD effect; as well as effect the geologic characteristics such as faults and natural fracture zones,lithologic interface,shale bedding.The results show that: Firstly,though the casing strength gradually decreased as the dogleg angle increasing,the casing collapsing strength drops off only 3.8% with average 2.7°/30m dogleg angle in the casing deformation zone,which showed that it can not lead casing deformation directly.Then,though the influence of temperature and loss of cement sheath integrity will significantly reduce the safety factor of the casing,it cannot be excluded that the local cement sheath can be always damaged after hydraulic fracturing,which suggested the APD effect was not the main factor leading to casing deformation.Finally,the original stress balance near wellbore can be destroyed during multistage hydraulic fracturing leading to non-uniform in-situ stress,which can active the fault,natural fractures,lithologic interface,shale bedding to slip.Therefore there were high probability of casing deformation in the formation with faults,natural fracture zones and strong heterogeneity.The above analysis can be used to explain why there is serious casing deformation in Weiyuan and Changning of China.Perforating far away from the point where casing deformation occurred easily and design the proper fracturing scheme can help us avoid casing deformation rather than simply raising steel grade and wall thickness of casing.
机译：套管变形在魏源春天的页岩气井液体井中的液压压裂中，套管变形的比例超过30％。无论如何，美国和其他页岩气产区没有这样的现象。为什么有这么多水平井套装在魏源改造，中国？可能是各种各样的因素。作者主要分析井钻井和完成过程中对运营因子的套件变形的影响，包括狗角角度，水泥鞘损失和APD效果的损失;除了缺陷和自然骨折区域，岩性界面，页岩床上用品等地质特征。结果表明：首先，虽然套管强度随着拆射角度的增加而逐渐减小，但壳体塌陷强度仅为3.8％下降平均2.7°/ 30m的套管变形区中的角度，显示它不能直接引导套管变形。然后，尽管水泥鞘的影响和水泥鞘的损失会显着降低套管的安全系数，但它不能是在液压压裂后，局部水泥护套可以始终损坏，这表明APD效果不是导致套管变形的主要因素。最后，在多级液压压裂期间可以破坏井筒附近的原始压力平衡，导致不均匀-situ压力，它可以活跃故障，自然骨折，岩性界面，页岩床上用品滑倒。因此有很高的概率患有故障，自然骨折区域和强异质性形成的套件变形。以上分析可用于解释为什么魏源和中国的长宁发生严重的套管变形。远离套管变形容易发生的程度设计适当的压裂方案可以帮助我们避免外壳变形，而不是简单地提高壳体的钢级和壁厚。

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