四川盆地页岩气水平井B环空带压原因分析与对策

发布时间：2018-04-09 01:32

本文选题：环空带压　切入点：页岩气井　出处：《石油钻采工艺》2017年05期

【摘要】：四川盆地页岩气井环空带压井比例较高,对气藏高效开发和气井井筒完整性带来了挑战。通过对国内页岩气开发区块环空带压实际情况的具体分析,运用同位分析方法确定气体来源,采用物理模拟试验方法开展页岩气井环空带压机理研究,明确了不同水泥浆体系下压裂过程中水泥环密封失效规律,形成了改善水泥环密封性能、缓解分段压裂井环空带压现象的关键技术:在浆柱结构完全满足密封要求的基础上,利用相间填充技术和降低水泥石孔隙度方法,开发出低孔隙度低弹性模量水泥浆体系,弹性模量低至4.2 GPa,相比常规水泥石35%的孔隙度,孔隙度降低27.1%,水泥石弹性变形能力大幅提升。现场5口井的应用实践证明,固井质量优质率达到100%,且未发生环空带压现象,对环空带压的控制具有良好的借鉴作用。
[Abstract]:The high proportion of shale gas wells in the annulus in Sichuan basin brings challenges to the high efficiency development of gas reservoirs and the integrity of gas well bore.Through the concrete analysis of the actual situation of annulus zone pressure in shale gas development blocks in China, the source of gas is determined by using the same position analysis method, and the mechanism of annulus zone pressure in shale gas wells is studied by physical simulation test method.The failure rule of cement ring seal during fracturing with different cement slurry systems is clarified, and the key technology to improve the sealing performance of cement ring and to alleviate the phenomenon of annulus pressure in segmented fracturing well is formed: on the basis of the slurry column structure meeting the sealing requirement completely,The low porosity and low elastic modulus cement slurry system was developed by using the interphase filling technique and the method of reducing the porosity of cement stone. The elastic modulus was as low as 4.2 GPA, which compared with the conventional cement stone porosity of 35%.When porosity is reduced by 27.1, the elastic deformation ability of cement stone is greatly improved.The application practice of 5 wells in the field proves that the cementing quality and high quality rate is 100 and there is no annular zone pressure phenomenon, which has a good reference value for the control of annular zone pressure.
【作者单位】：页岩油气富集机理与有效开发国家重点试验室;中国石油化工股份有限公司石油工程技术研究院;中石化重庆涪陵页岩气勘探开发有限公司;
【基金】：国家重大专项示范工程“彭水地区常压钻井及高效压裂工程工艺优化技术”(编号:2015ZX05069-002) 中石化科技攻关项目“改善天然气井水泥环长期密封性技术研究”(编号:P14112)
【分类号】：TE243

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