The efficient exploration and development of unconventional oil and gas are critical for increasing the self-sufficiency of oil and gas supplies in China.However,such operations continue to face serious prob-lems(e.g.,borehole collapse,loss,and high friction),and associated formation damage can severely impact well completion rates,increase costs,and reduce efficiencies.Water-based drilling fluids possess certain advantages over oil-based drilling fluids(OBDFs)and may offer lasting solutions to resolve the aforementioned issues.However,a significant breakthrough with this material has not yet been made,and major technical problems continue to hinder the economic and large-scale development of uncon-ventional oil and gas.Here,the international frontier external method,which only improves drilling fluid inhibition and lubricity,is expanded into an internal-external technique that improves the overall well-bore quality during drilling.Bionic technologies are introduced into the chemical material synthesis pro-cess to imitate the activity of life.A novel drilling and completion fluid technique was developed to improve wellbore quality during drilling and safeguard formation integrity.Macroscopic and microscopic analyses indicated that in terms of wellbore stability,lubricity,and formation protection,this approach could outperform methods that use typical OBDFs.The proposed method also achieves a classification upgrade from environmentally protective drilling fluid to an ecologically friendly drilling fluid.The devel-oped technology was verified in more than 1000 unconventional oil and gas wells in China,and the results indicate significant alleviation of the formation damage attributed to borehole collapse,loss,and high friction.It has been recognized as an effective core technology for exploiting unconventional oil and gas resources.This study introduces a novel research direction for formation protection technol-ogy and demonstrates that observations and learning from the natural world can provide an inex-haustible source of ideas and inspire the creation of original materials,technologies,and theories for petroleum engineering.

Guancheng Jiang;Jinsheng Sun;Yinbo He;Kaixiao Cui;Tengfei Dong;Lili Yang;Xukun Yang;Xingxing Wang

State Key Laboratory of Petroleum Resources and Prospecting,MOE Key Laboratory of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266850,China

工程（英文）

[1]Guancheng Jiang;Jinsheng Sun;Yinbo He;Kaixiao Cui;Tengfei Dong;Lili Yang;Xukun Yang;Xingxing Wang-.Novel Water-Based Drilling and Completion Fluid Technology to Improve Wellbore Quality During Drilling and Protect Unconventional Reservoirs)[J].工程（英文）,2022(11):129-142

Wellbore,OBDFs,haustible

Novel,Water,Based,Drilling,Completion,Fluid,Technology,Improve,Quality,During,Protect,Unconventional,Reservoirs,efficient,exploration,development,unconventional,oil,gas,are,critical,increasing,self,sufficiency,supplies,China,However,such,operations,continue,face,serious,borehole,collapse,loss,high,friction,associated,formation,damage,severely,impact,completion,increase,costs,reduce,efficiencies,drilling,fluids,possess,certain,advantages,may,offer,lasting,solutions,resolve,aforementioned,issues,significant,breakthrough,this,has,not,yet,been,made,major,technical,problems,hinder,economic,large,scale,Here,international,frontier,external,which,only,improves,inhibition,lubricity,expanded,into,internal,technique,that,overall,quality,during,Bionic,technologies,introduced,chemical,synthesis,cess,imitate,activity,life,novel,was,developed,wellbore,safeguard,integrity,Macroscopic,microscopic,analyses,indicated,terms,stability,protection,approach,could,outperform,methods,use,typical,proposed,also,achieves,classification,upgrade,from,environmentally,protective,ecologically,friendly,technology,verified,more,than,wells,results,alleviation,attributed,It,recognized,effective,core,exploiting,resources,This,study,introduces,research,direction,demonstrates,observations,learning,natural,world,provide,inex,ideas,inspire,creation,original,materials,theories,petroleum,engineering

0.567501