Abstract
Fractured reservoir is developed in Lingshui gas field and the problem of lost circulation is prominent. To improve the pressure bearing capacity of fractured formation, the wellbore strengthening technology was applied in this block. The fracture width of Lingshui gas field was predicted with finite element method, which considered the effect of wellbore pressure, in-situ stress, seepage fluid and pore pressure. The simulation results showed that the fracture width of Lingshui block ranged from 0 to 464 μm. Based on the prediction results of fracture width, the particle size distribution of lost circulation material (LCM) was selected with dynamic fracture width testing device. The results indicated that the D50 rule has the best sealing efficiency. The optimized LCM formula had better compatibility performance with water-based drilling fluid. The sealing results illustrated that invasion depth of seepage loss was smaller than 0.3 cm and the pressure bearing capacity of fracture reached to 17 MPa.
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