电脉冲破岩钻井地层主要参数敏感性分析  

Sensitivity Analysis of Main Formation Parameters in Electric Pulse Rock-Breaking

作　　者：程晋 乔汉 李星月 韩飞 王宏伟 Cheng Jin;Qiao Han;Li Xingyue;Han Fei;Wang Hongwei(NPC Engineering Technology R&D Company Limited)

机构地区：[1]中国石油集团工程技术研究院有限公司

出　　处：《石油机械》2024年第1期20-28,共9页China Petroleum Machinery

基　　金：中国石油天然气集团有限公司科学研究与开发项目“深井超深井优快钻井技术研究”(2021DJ4101)。

摘　　要：岩石的硬度、耐磨性等严重限制了深层超深层油气资源的高效开采,而电脉冲破岩钻井技术在破碎硬岩方面具有独特优势。为探究地层特性对电脉冲破岩效果的影响,根据电脉冲破岩的基本原理,并基于基本破岩单元建立了动态电损伤模型。基于动态电损伤模型,讨论了特定高压脉冲电源参数下,岩石特性对电脉冲破岩效果的影响。通过讨论分析可知,相对介电常数越大,岩石内部发生电击穿的时间成本越低,破坏深度与损伤总量也会越大;电击穿时间、破坏深度会随泊松比和弹性模量的变化出现小幅波动,但不具有规律性;岩石的密度不会对电脉冲破岩造成影响。相关结论可为电脉冲破岩钻井技术的进一步工业化应用提供一定参考。The hardness and wear resistance of rocks severely limit the efficient exploitation of deep and ultra-deep oil and gas resources,while electric pulse rock-breaking technology has unique advantages in breaking hard rocks.To investigate the influence of formation properties on the performance of electric pulse rock-breaking,a dy-namic electric damage model was built based on the basic rock-breaking unit according to the principle of electric pulse rock-breaking.Then,the influence of rock properties on the performance of electric pulse rock-breaking un-der specific high-voltage pulse power supply parameters was discussed.The results show that the larger the relative dielectric constant,the lower the time cost of electric breakdown occurring inside the rock,and the greater the depth of failure and the total amount of damage.The electric breakdown time and depth of failure fluctuate slightly with changes in Poissons ratio and Youngs modulus,but there is no regularity.The density of the rock does not affect the performance of electric pulse rock-breaking.The research findings provide some reference for the promo-tion of electric pulse rock-breaking technology.

关 键 词：电脉冲破岩钻井 岩石特性 电击穿 破岩 地层参数敏感性 

分 类 号：TE21[石油与天然气工程—油气井工程]