新型环保钻井液在套管开窗侧钻井的研究与应用  

Study and Application of a New Environmentally Friendly Drilling Fluid in Through-Casing Sidetrack Drilling

作　　者：刘波 高龙 陈明勇 孙欢 黄旭平 赵瑛 LIU Bo;GAO Long;CHEN Mingyong;SUN Huan;HUANG Xuping;ZHAO Ying(CCDC Changqing General Drilling Company of CNPC,Xi’an,Shaanxi 710000)

机构地区：[1]中国石油川庆钻探长庆钻井总公司,西安710000

出　　处：《钻井液与完井液》2023年第2期202-208,共7页Drilling Fluid & Completion Fluid

基　　金：中国石油集团川庆钻探项目“伊陕-渭北过渡带宜黄恶性漏失区块安全钻完井技术研究与应用”(CQ2019B-20-2-3)资助。

摘　　要：针对苏里格气田二叠系“双石组”硬脆泥岩段掉块剥落,山西组煤系地层、黑色泥岩井壁失稳及水平段滑动钻进加压困难等现象,传统的防塌抑制剂因环保要求受到一定限制,前期钻井过程中已出现了长时间划眼、填井侧钻等复杂情况。文中通过对半纤维素衍生物进行化学改性研制出了环保型改性纤维素为抑制剂CQYZJ-3,形成了一套适用于苏里格气田套管开窗侧钻水平井环保钻井液体系HCG-1,并对该体系进行室内评价。结果表明:钻井液体系流变性能稳定,具有良好的抑制性、润滑性、抗污染能力、缓蚀能力,属无毒、易降解环保钻井液体系。HCG-1钻井液体系在苏里格区块施工的10余口井均获得成功。现场应用表明:HCG-1钻井液体系稳定,防塌抑制性强,润滑性好,电测下套管一次成功,无井下复杂事故发生,同时可实现钻井液的重复利用,取得了较好的应用效果。Several problems have been encountered in the development of the Sulige gas field,for example,the caving and sloughing of the hard and brittle mudstones of the Shuangshi formation of the Permian system,borehole instability of the black mudstones as well as difficulties in exerting weight to the bit in horizontal slide drilling,to name but three.Environmental protection requirements have limited the use of conventional shale inhibitors.In previous drilling operation,long time reaming,sidetracking after plugging the abandoned hole have been the norm for some time.To deal with these problems,an environmentally friendly cellulose shale inhibitor CQYJZ-3 was developed through chemical modification of a hemicellulose derivative,and an environmentally friendly drilling fluid named HCG-1,which is suitable for through-casing sidetracking of horizontal wells in Sulige gas field,was developed.Laboratory experimental results show that HCG-1 drilling fluid has stable rheology and good properties such as inhibitive capacity,lubricity,contamination resistance and corrosion inhibition.It is a non-toxic easy-to-degrade drilling fluid.This drilling fluid has been successfully used on 10 wells in the Sulige gas field.Field operation showed that HCG-1 had stable properties,good inhibitive capacity and lubricity.Wireline logging was successful at the first try.No downhole troubles were encountered during drilling.The HCG-1 drilling fluid can be also recovered for re-use.Good application achievements were obtained with the use of the HCG-1 in the Sulige gas field.

关 键 词：环保钻井液 抑制性 开窗侧钻水平井 润滑性 流变性 

分 类 号：TE254.3[石油与天然气工程—油气井工程]