CAJ | 학술논문

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.
찬정과정중소찬지층암석수선접촉적시찬정액,여과찬정액능이보증정벽은정위전제재순간유효강저지층암석강도,즉가대폭도제고궤계찬속.채용삼투솔대소불동적천연암심재불동농도적쾌속찬정제(KSZJ)중침포불동시간,암석순간강도급최종강도적변화표명,KSZJ능이교고적삼투속솔이급교대삼투체적신속삼입암석적렬문,종이강화료렬문첨단적응력,촉사렬문신속확전이치순간파배암석강도,제고파암효솔,종이제고궤계찬속;수착침포시간적증가,암심강도야수지신속증강병추우은정,유리우정벽은정,보지정경규칙.재사류찬정모의실험장치상찬진불동경도적암석급해랍이분지오126-88정진행적현장시험결과표명:쾌속찬정액기술유효해결료정벽실은문제,제고평균궤계찬속현저.
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.