Accurate drilling technology for horizontal wells in continental shale formation geology-engineering integration—Taking Jiyeyou 1HF well in Songliao Basin as an example
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摘要:
研究目的 陆相页岩油是中国能源重要的接替领域，长水平井精确钻探是实现页岩油商业开发的关键技术。但由于陆相页岩具有黏土矿物含量高、非均质性强、层理发育等特点，导致水平井井壁失稳严重、薄目标靶层精确导向困难等钻探技术难题。
研究方法 以松辽盆地南部青一段页岩为研究对象，综合利用地球化学、地球物理、岩石力学、地应力分析等手段，开展地质工程一体化研究。
研究结果 青一段上部页岩为层理型页岩不适合作为水平井穿行层段，青一段中下部纹层状页岩中的含油薄砂条兼具含油性、可钻性、可压性，可作为穿行目标层；页岩地层需选择强抑制KCL聚胺钻井液体系和油基钻井液体系实施水平井钻探，泥浆密度窗口随水平应力差和井轨迹倾角的增大而增高；测井GR和录井总烃可以精确反映目标靶层岩性非均质变化，结合高精度地球物理，可实时精确调控钻井轨迹。
结论 经应用实践，吉页油1HF井沿1.94m超薄目标靶层安全钻进1252m，钻遇率100%，实现了陆相页岩油长水平段精确钻探的技术突破，为吉页油1HF井获得高产工业油流奠定了基础，对中国同类型陆相页岩油长水平段精确钻探具有引领和借鉴意义。
Abstract:This paper is the result of oil and gas exploration engineering.
Objective Continental shale oil is an important replacement field of energy in China, and precise drilling of long horizontal wells is a key technology to achieve commercial development of shale oil. However, due to the characteristics of continental shale such as high clay mineral content, strong heterogeneity and bedding development, serious instability of horizontal well wall and difficulties in precise steering of thin target layer are caused.
Methods Taking the shale of the first member of Qinghe Formation in the south of Songliao Basin as the research object, the integrated research of geological engineering is carried out by comprehensively using geochemical, geophysical, rock mechanics, geostress analysis and other means.
Results The shale in the upper part of Qing-1 Member is bedding shale, which is not suitable for horizontal wells to pass through. The thin oil-bearing sand bars in the lamellar shale in the middle and lower part of Qing-1 Member are both oil-bearing, drillable and compressible, which can be used as the crossing target layer; For shale formation, strong inhibition KCL polyamine drilling fluid system and oil-based drilling fluid system should be selected for horizontal well drilling. The mud density window increases with the increase of horizontal stress difference and well trajectory inclination angle; Logging GR and logging total hydrocarbon can accurately reflect the lithological heterogeneity change of target layer, and combined with high-precision geophysics, it can accurately control the drilling trajectory in real time.
Conclusions Through application and practice, Jiye 1HF well has safely drilled 1252m along 1.94m ultra-thin target bed, with a penetration rate of 100%, which has achieved a technical breakthrough in accurate drilling of long horizontal section of continental shale oil, laid a foundation for Jiye 1HF well to obtain high-yield industrial oil flow, and has guiding and reference significance for accurate drilling of long horizontal section of continental shale oil of the same type in China.
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表 1 松辽盆地与国内其他含陆相页岩矿物成分对比数据
Table 1. Comparison data table of mineral composition of domestic continental shale between Songliao Basin and other Basins
下载: 导出CSV
表 2 吉页油1井青一段各层组级目标靶层参数对比
Table 2. Comparison table of target layer parameters of each layer in the Qing 1st of Jiyeyou 1 well
下载: 导出CSV
表 3 吉页油1HF井钻井液配方及钻屑回收率试验结果对比
Table 3. Comparison table of drilling fluid formulation and cuttings recovery test results of Jiyeyou 1HF well
下载: 导出CSV
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