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Study on catastrophe mechanism of hydraulic fracturing fracks initiation in radial boreholes
Geomechanics and Geophysics for Geo-Energy and Geo-Resources ( IF 5 ) Pub Date : 2020-07-14 , DOI: 10.1007/s40948-020-00169-7
Wanchun Zhao , Jing Ge , Tingting Wang , Hao Zhang , Yuwei Li

Radial drilling hydraulic fracturing has become a new stimulation method. The hydraulic fracturing effect of radial drilling on site is not ideal, and the stimulation effect of some wells is not obvious. The hydraulic fracturing effect of radial drilling is closely related to the crack initiation position after radial drilling fracturing. In the past researches on fracture initiation in radial drilling hydraulic fracturing, it is believed that the fracture initiation position is the radial drilling position and extends along the drilling direction. In this paper, a new model is established to solve the problem of hydraulic fracturing initiation mechanism in radial drilling. By studying the crustal stress analysis around radial drilling, it is found that when the parameters such as angle or crustal stress reach a certain degree, the initiation position appears near the wellhead. The occurrence of this mutation is the main reason for the unsatisfactory effect of hydraulic fracturing in radial drilling. The research results in this paper provide a reliable basis for radial drilling fracturing reconstruction of unconventional oil and gas reservoirs, and reference for the design of construction parameters of radial drilling.

中文翻译:

径向井水力压裂压裂引发的突变机理研究

径向钻孔水力压裂已成为一种新的增产方法。径向钻探的水力压裂效果不理想,部分井的增产效果不明显。径向钻孔的水力压裂效果与径向钻孔压裂后的裂纹起始位置密切相关。在过去的关于径向钻探水力压裂中的裂缝起爆的研究中,认为裂缝起爆位置是径向钻探位置并且沿着钻探方向延伸。本文建立了一个新的模型,以解决径向钻进中水力压裂引发机理的问题。通过研究径向钻探周围的地壳应力分析,发现当角度或地壳应力等参数达到一定程度时,起始位置出现在井口附近。这种突变的发生是径向钻孔中水力压裂效果不理想的主要原因。本文的研究成果为非常规油气藏的径向钻探压裂改造提供了可靠的依据,为径向钻探施工参数的设计提供参考。
更新日期:2020-07-14
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