快速钻井剂稳定井壁快速钻进作用机理研究  

STUDY ON THE MECHANISM OF INCREASING ROP & BOREHOLE STABILITY OF FASTER PENETRATION DRILLING FLUID

作　　者：杨宇平[1,2] 孙金声 杨枝[3] 卢运虎[4] 江四清 

机构地区：[1]中国石油集团钻井工程技术研究院,北京100195 [2]中国石油勘探开发研究院博士后流动站,北京100083 [3]中国地质大学(北京)工程技术学院,北京100083 [4]中国石油大学石油工程教育部重点实验室,北京昌平102249 [5]中国石油长城钻探工程公司钻井液分公司,北京100101

出　　处：《西南石油大学学报（自然科学版）》2010年第1期165-169,共5页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：中国石油天然气集团公司应用基础研究项目(06A20403;2008A-2300);钻井新技术推广项目(2008G-5207)

摘　　要：钻井过程中所钻地层岩石首先接触的是钻井液,如果钻井液能以保证井壁稳定为前提在瞬间有效降低地层岩石强度,即可大幅度提高机械钻速。采用渗透率大小不同的天然岩芯在不同浓度的快速钻井剂(KSZJ)中浸泡不同时间,岩石瞬间强度及最终强度的变化表明,KSZJ能以较高的渗透速率以及较大渗透体积迅速渗入岩石的裂纹,从而强化了裂纹尖端的应力,促使裂纹迅速扩展以致瞬间破坏岩石强度,提高破岩效率,从而提高机械钻速;随着浸泡时间的增加,岩芯强度也随之迅速增强并趋于稳定,有利于井壁稳定,保持井径规则。在射流钻井模拟实验装置上钻进不同硬度的岩石及海拉尔盆地乌126-88井进行的现场试验结果表明:快速钻井液技术有效解决了井壁失稳问题,提高平均机械钻速显著。During the process of drilling operation,the penetrated formation rocks are firstly exposed to drilling fluids,if the fluids which can ensure borehole stability can effectively decreases rock strength instantaneously,the rate of penetration will be considerably increased.The natural cores with different permeability are soaked in KSZJ fluids with different concentration for different duration,the changes of instantaneous rock strength and final strength shows KSZJ can penetrate into the cracks of the rocks at higher permeable rate and larger permeable volume,so as to enhance the stress off crack tip and make the cracks quickly extend,the strength of rocks in broken up instantaneously,so the stress of crack tip is enhanced,the cracks are forced to quickly extend as to the stress is broken up instantaneously,the rock-breaking efficiency is improved and rate of penetration increased.As the increase of the soaking duration,the core stress increases quickly and tends to stability,which is favorable for borehole stability and well bore regularity.The KSZJ technology was used to test device of jetting drilling simulator to penetrate the rocks with different hardness and the in-situ test in well 126-88,Hailar Basin,results show KSZJ fluid technology effectively solves the problem of borehole instability and the mean rate of penetration is considerably increased.

关 键 词：快速钻井处理剂(KSZJ) 岩石强度 机械钻速 稳定井壁 作用机理 

分 类 号：TE254[石油与天然气工程—油气井工程]