CONTROLLING CIRCULATION loss during well construction is more than just selecting the proper type of lost circulation material (LCM). A fully engineered approach incorporates a number of planning tools, including: Borehole stability analysis; Hydraulics modeling to estimate equivalent circulating density (ECD); Drilling fluid and LCM material selection to help minimize effects on ECD. Planning should include means to provide on-site monitoring using pressure-while-drilling (PWD) and connection flow monitoring and timely application of LCM and treatments.
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