Abstract: The present application discloses a nanometer self-locking bentonite film-forming agent, a method for preparing the same, and a film-forming drilling fluid.

Abstract: A method for determining surface area of a created hydraulic fracture that originated from a wellbore. Pressure in the wellbore is monitored after creation and extension of the created hydraulic fracture. Injection rate of an injection fluid to the created hydraulic fracture is regulated. This is done to maintain a constant pressure for a continuous period of time. The injection rate is regulated such that the created hydraulic fracture maintains its current dimensions and the injection rate of the injection fluid into the created hydraulic fracture equals the total fluid leak-off rate from the created hydraulic fracture. The constant fracture pressure is larger than a formation pore pressure and smaller than a fracture propagation pressure. Finally, a numerical simulation is performed to obtain the relationship between the total fluid leak-off rate and the surface area of the created hydraulic fracture.

Abstract: Systems and methods for determining fluid leak-off rate and estimating hydraulic fracture surface area originated from a wellbore, are provided. Method includes connecting a pressure gauge to wellbore to monitor pressure during and after hydraulic fracturing operations. Method includes identifying a fracture pressure, where identified fracture pressure is larger than a formation pore pressure and smaller than a fracture propagation pressure. Method also includes regulating injection rate of an injection fluid to a created hydraulic fracture to maintain constant fracture pressure, such that created hydraulic fracture maintains its current dimensions and injection rate of injection fluid into created hydraulic fracture equals total fluid leak-off rate from created hydraulic fracture, where constant fracture pressure equals identified fracture pressure.

Abstract: A system and method for improving integrity of a cased wellbore. The method comprises identifying at least one weak plane corresponding to a highest probability of slip of fault within the open-hole wellbore. Further, the method comprises providing pressurized fluid into the open-hole wellbore to cause the slip of the fault by inducing tensile or shear failures within the open-hole wellbore along the at least one weak plane. The method also comprises restoring a shape of the open-hole wellbore after the slip of the fault by removing material from an inner surface of the open-hole wellbore, to provide a uniform or smooth cross-section along an elongate axis of the open-hole wellbore. The method further comprises arranging and cementing a casing along the restored open-hole wellbore to obtain the cased wellbore having improved integrity.