Abstract: A well tool includes a perforating gun including multiple shaped charges, a sheath encapsulating the perforating gun and powdered acid in an internal chamber defined by the sheath. The perforating gun is lowered to a depth into a wellbore formed in a subterranean zone. The multiple shaped charges are fired to form multiple perforations in the wellbore at the depth. The multiple perforations provide access to the subterranean zone at the depth. The sheath, which covers at least some of the multiple shaped charges, breaks responsive to at least some of the multiple shaped charges being fired. The powdered acid in the internal chamber is applied to the subterranean zone responsive to the multiple shaped charges being fired. The powdered acid reacts with and weakens the subterranean zone at the depth to ease flow of hydraulic fracturing fluid into the subterranean zone at the depth.

Abstract: Sheath encapsulation to convey acid to formation fracture is implemented by a well tool that includes a perforating gun including multiple shaped charges, a sheath encapsulating the perforating gun and powdered acid in an internal chamber defined by the sheath. The perforating gun is lowered to a depth into a wellbore formed in a subterranean zone. The multiple shaped charges are fired to form multiple perforations in the wellbore at the depth. The multiple perforations provide access to the subterranean zone at the depth. The sheath, which covers at least some of the multiple shaped charges, breaks responsive to at least some of the multiple shaped charges being fired. The powdered acid in the internal chamber is applied to the subterranean zone responsive to the multiple shaped charges being fired. The powdered acid reacts with and weakens the subterranean zone at the depth to ease flow of hydraulic fracturing fluid into the subterranean zone at the depth.