Prediction of Fracture Width Using Logging Data Optimization of Lost Circulation

Аннотация

In this study, the efficiency of fractures was evaluated, and their morphological characteristics estimated based on full-hole microresistivity and azimuth resistivity imaging logging. The lost circulation is mainly due to the induced fractures in the ZW areas. The parameters of fracture aperture and porosity can be calculated using dual lateral logging information. The high-angle fracture parameters pertaining to lost circulation in the ZW3-x well include a fracture width in the range of 0.5-5 mm, permeability <15 mD, porosity ~ 20%, and an extended fracture length of ~ 3 m. The compressive strength of walnut shells and rigid particles under different conditions is measured by a compressive strength device. It is shown that the compressive performance of rigid particles is more stable than that of walnut shells. The optimized drilling fluid formula is established for the different size ranges of the rigid particles. Basing on the theoretical calculations, the optimal composition of the rigid particles and drilling plugging agents was established for use in the slug-type follow-drilling plugging technology. This resulted in successful plugging using a small amount of drilling fluid and blocking time (~ 0.5 h). Another major advantage is that this plugging technology can be effectively incorporated while drilling.