Polyamine-like Oil-based Drilling Fluid Technology Research And Application In Western Sichuan

When drilling to develop the western area, the horse well, Xiaoquan shallow rich As one can easily construct hydration expansion and dispersion of reddish brown (brown) shale, natural mud in serious condition, easily lead to further borehole collapse, necking stability problem, increase from the drilling friction and torque, and even cause sticking Difficult complex situations or accidents. Through statistical pre-construction conditions in the region showed that:Existing water-based drilling fluid system is difficult to fully meet the needs of the construction of horizontal wells in western Sichuan formations exhibit more complex cases, particularly the formation wellbore instability, inclined section, horizontal section friction and large complex problems.Ini this paper, the formation characteristics and drilling for the western Sichuan technical difficulty, the status quo in the full investigation of polyamine imitation of oil-based drilling fluid system at home and abroad, based on the polyamine imitation of oil-based drilling fluid system treatment agent is preferably, system optimization and performance evaluation Field Application of a comprehensive in-depth study:(1) Through geology western area of research, analysis of the region formation characteristics, the drilling fluid system difficulties and difficulty of construction, comprehensive pre-drilling complex situation in the region indicates that the current water-based drilling fluid system used by western area difficult to meet the development requirements of drilling.(2) For complex situations arise in western Sichuan region, focusing on the wall more stable polyamine imitation oil-based drilling fluid is preferred, issued a set of developed polyamine imitation oil-based drilling fluid system:3-4%NV-1+0.03%MMCA+ +1%LV-CMC+3-5%MEG+0.4%JA-11+1-1.5%KHPAN+0.5?1%NH4HPAN+1?2%FT342+0 .1%NaOH+0.2-0.5%QS-2+BaSO4.(3) Experimental evaluation shows that the system has a strong inhibition, strong sealing and excellent lubricity. And the polyamine imitation of oil-based drilling fluid system optimization and performance evaluation system proposed restructuring plan and maintenance elements, the formation of a unique construction techniques for the polyamine imitation of oil-based drilling fluid system in western Sichuan formations.(4) Field Application Practice shows that whipstocking section, horizontal section from the drilling well, wellbore stability, unimpeded card and other complex happening, meet western area of horizontal wells safe, efficient construction needs.