Research and Application of Enhanced Soil-free Phase Bionic Oil-Based Drilling Fluid Technology
Aiming at the problems of high temperature and high pressure,borehole instability and downhole com-plexity in the drilling process of deep and ultra-deep wells,based on the theories of bionics,supramolecular chem-istry and rock surface wettability,a set of synergistic soil-free phase bionic oil-based drilling fluid system for deep and ultra-deep wells drilling has been developed through the selection of bionic synergists,bionic cuttings agents and bionic filtration-loss reducing agents and the matching of related treating agents.It is found that the estab-lished synergistic soil-free phase oil-based drilling fluid system can resist 220℃high temperature,with a formula-tion density of 2.4 g/cm3,an emulsion breaking voltage of more than 400 V,and a high-temperature and high-pressure filtration loss of 3.2 mL;the compressive strength of man-made cores after aging in the system at 220℃reaches 7.1 MPa;and the average permeability recovery value is 93.9%.Field application shows that the system has stable rheological properties,the average ROP is 16%higher than that of adjacent wells,and the average hole enlargement rate is only 1.25%,which can effectively solve the problem of borehole instability that occurs in the drilling process of deep and ultra-deep wells,and provide technical guarantee for the drilling of deep and ultra-deep wells in China.
deep and ultra-deep wellsoil-based drilling fluidssoil-free phasebionicefficiency enhancement
NETL
NSTL
万方数据
维普
