Drilling fluids play a vital role in the success of oil and gas operations,ensuring cooling,lubrication,cuttings transport,and wellbore stability.Driven by environmental regulations,water-based muds(WBMs)have emerged ...Drilling fluids play a vital role in the success of oil and gas operations,ensuring cooling,lubrication,cuttings transport,and wellbore stability.Driven by environmental regulations,water-based muds(WBMs)have emerged as a sustainable alternative to oil-based systems;however,achieving effective fluid loss control in WBMs remains a significant technical challenge.This review critically examines the recent evolution of additive strategies,including polymeric materials,nanoparticles,and waste-derived resources targeted at improving the WBM performance.Polymeric additives enhance fluid retention and filter cake structure through gelation mechanisms,nanoparticles offer superior pore-throat plugging and mechanical reinforcement,and waste materials provide eco-efficient solutions without compromising operational efficacy.Furthermore,synergistic integrations of these additives have demonstrated compounded benefits in rheological enhancement and filtration reduction.This review provides a comprehensive analysis of mechanisms,performance trends,and practical implementation considerations,offering clear pathways to advance water-based mud design in response to the industry's dual demands for technical efficiency and environmental sustainability.展开更多
With increasing drilling depth and large dosage of weighting materials,drilling fluids with high solid content are characterized by poor stability,high viscosity,large water loss,and thick mud cake,easier leading to r...With increasing drilling depth and large dosage of weighting materials,drilling fluids with high solid content are characterized by poor stability,high viscosity,large water loss,and thick mud cake,easier leading to reservoir damage and wellbore instability.In this paper,micronized barite(MB)was modified(mMB)by grafting with hydrophilic polymer onto the surface through the free radical polymerization to displace conventional API barite partly.The suspension stability of water-based drilling fluids(WBDFs)weighted with API barite:mMB=2:1 in 600 g was significantly enhanced compared with that with API barite/WBDFs,exhibiting the static sag factor within 0.54 and the whole stability index of 2.The viscosity and yield point reached the minimum,with a reduction of more than 40%compared with API barite only at the same density.Through multi-stage filling and dense accumulation of weighting materials and clays,filtration loss was decreased,mud cake quality was improved,and simultaneously it had great reservoir protection performance,and the permeability recovery rate reached 87%.In addition,it also effectively improved the lubricity of WBDFs.The sticking coefficient of mud cake was reduced by 53.4%,and the friction coefficient was 0.2603.Therefore,mMB can serve as a versatile additive to control the density,rheology,filtration,and stability of WBDFs weighted with API barite,thus regulating comprehensive performance and achieving reservoir protection capacity.This work opened up a new path for the productive drilling of extremely deep and intricate wells by providing an efficient method for managing the performance of high-density WBDFs.展开更多
文摘Drilling fluids play a vital role in the success of oil and gas operations,ensuring cooling,lubrication,cuttings transport,and wellbore stability.Driven by environmental regulations,water-based muds(WBMs)have emerged as a sustainable alternative to oil-based systems;however,achieving effective fluid loss control in WBMs remains a significant technical challenge.This review critically examines the recent evolution of additive strategies,including polymeric materials,nanoparticles,and waste-derived resources targeted at improving the WBM performance.Polymeric additives enhance fluid retention and filter cake structure through gelation mechanisms,nanoparticles offer superior pore-throat plugging and mechanical reinforcement,and waste materials provide eco-efficient solutions without compromising operational efficacy.Furthermore,synergistic integrations of these additives have demonstrated compounded benefits in rheological enhancement and filtration reduction.This review provides a comprehensive analysis of mechanisms,performance trends,and practical implementation considerations,offering clear pathways to advance water-based mud design in response to the industry's dual demands for technical efficiency and environmental sustainability.
基金This work was supported by the National Natural Science Foundation of China(Grant No.51991361)the foundation of China University of Petroleum(Beijing)(Grant No.2462021YXZZ002).
文摘With increasing drilling depth and large dosage of weighting materials,drilling fluids with high solid content are characterized by poor stability,high viscosity,large water loss,and thick mud cake,easier leading to reservoir damage and wellbore instability.In this paper,micronized barite(MB)was modified(mMB)by grafting with hydrophilic polymer onto the surface through the free radical polymerization to displace conventional API barite partly.The suspension stability of water-based drilling fluids(WBDFs)weighted with API barite:mMB=2:1 in 600 g was significantly enhanced compared with that with API barite/WBDFs,exhibiting the static sag factor within 0.54 and the whole stability index of 2.The viscosity and yield point reached the minimum,with a reduction of more than 40%compared with API barite only at the same density.Through multi-stage filling and dense accumulation of weighting materials and clays,filtration loss was decreased,mud cake quality was improved,and simultaneously it had great reservoir protection performance,and the permeability recovery rate reached 87%.In addition,it also effectively improved the lubricity of WBDFs.The sticking coefficient of mud cake was reduced by 53.4%,and the friction coefficient was 0.2603.Therefore,mMB can serve as a versatile additive to control the density,rheology,filtration,and stability of WBDFs weighted with API barite,thus regulating comprehensive performance and achieving reservoir protection capacity.This work opened up a new path for the productive drilling of extremely deep and intricate wells by providing an efficient method for managing the performance of high-density WBDFs.
