Systems and methods for collecting debris in a subterranean well include a wellbore cleanout tool having a tool housing with a tool bore. The wellbore cleanout tool further includes a power source, a wire in electrical communication with the power source, and a core member located within the tool bore. The wire is wound around the core member with a first end and a second end of the wire in electrical connection with a positive terminal and a negative terminal of the power source, respectively. A plurality of magnetic bars are spaced around the core member. A sleeve member is moveable between an uphole position where the sleeve member circumscribes the plurality of magnetic bars, and a downhole position where the sleeve member is located downhole of a portion of the plurality of magnetic bars and can be a collection basket. The wellbore cleanout tool further has a permanent magnet.

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.

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.

Embodiments of a debris catcher and a debris catching system are disclosed herein. In one embodiment, a debris catching system comprises a plug and a debris catcher, the debris catcher including at least a debris catching sleeve, a running tool coupled to the debris catching sleeve, the running tool including an uphole end and a downhole end, and further wherein the uphole end of the running tool is configured to slide to engage a downhole end of the debris catching sleeve and form a collection base of the debris catcher; and a coupling rod attached to the uphole end of the running tool, the coupling rod configured to engage a downhole setting device; wherein the plug is removably coupled with the downhole end of the running tool during downhole deployment of the debris catching system.

Embodiments of a debris catcher and a debris catching system are disclosed herein. In one embodiment, a debris catching system comprises a plug and a debris catcher, the debris catcher including at least a debris catching sleeve, a running tool coupled to the debris catching sleeve, the running tool including an uphole end and a downhole end, and further wherein the uphole end of the running tool is configured to slide to engage a downhole end of the debris catching sleeve and form a collection base of the debris catcher; and a coupling rod attached to the uphole end of the running tool, the coupling rod configured to engage a downhole setting device; wherein the plug is removably coupled with the downhole end of the running tool during downhole deployment of the debris catching system.

Systems and methods for neutralizing a hydrogen sulfide within a subterranean well include a hydrogen sulfide neutralizing tool having a tubular member. A tool shell circumscribes the tubular member, defining tool annular space between an outer diameter surface of the tubular member and an inner diameter surface of the tool shell. A sacrificial rod is located within the tool annular space and is formed of a material that produces metal sulfide when exposed to the hydrogen sulfide. An uphole perforation has an opening extending through a sidewall of the tubular member, defining a fluid flow path between the tool annular space and the internal bore of the tubular member. A downhole perforation is located downhole of the uphole perforation and hays an opening extending through the sidewall of the tubular member, defining a fluid flow path between the tool annular space and the internal bore of the tubular member.

Systems and methods for neutralizing a hydrogen sulfide within a subterranean well include a hydrogen sulfide neutralizing tool having a tubular member. A tool shell circumscribes the tubular member, defining tool annular space between an outer diameter surface of the tubular member and an inner diameter surface of the tool shell. A sacrificial rod is located within the tool annular space and is formed of a material that produces metal sulfide when exposed to the hydrogen sulfide. An uphole perforation has an opening extending through a sidewall of the tubular member, defining a fluid flow path between the tool annular space and the internal bore of the tubular member. A downhole perforation is located downhole of the uphole perforation and hays an opening extending through the sidewall of the tubular member, defining a fluid flow path between the tool annular space and the internal bore of the tubular member.

A desiccating module configured to be installed in a downhole tool is provided. The desiccating module includes a housing having a containment portion, and desiccant located in the containment portion of the housing capable of retaining moisture therein. The housing is configured to be retained in a downhole tool containing moisture sensitive electronics. The housing is configured to permit passage of moisture from outside the housing to the containment portion and to retain the desiccant within the containment portion. The desiccant have a retention capacity sufficient to hold a predetermined threshold amount of moisture.

A desiccating module configured to be installed in a downhole tool is provided. The desiccating module includes a housing having a containment portion, and desiccant located in the containment portion of the housing capable of retaining moisture therein. The housing is configured to be retained in a downhole tool containing moisture sensitive electronics. The housing is configured to permit passage of moisture from outside the housing to the containment portion and to retain the desiccant within the containment portion. The desiccant have a retention capacity sufficient to hold a predetermined threshold amount of moisture.

A wellbore assembly includes a production string disposed inside a wellbore and a junk collector coupled to a downhole end of the production string. The junk collector has an upper rim defining an opening configured to receive wellbore junk. The junk collector receives wellbore junk through the upper rim at a downhole end of the production string and stores the wellbore junk.