Methods and compositions (e.g., comprising an emulsion or a microemulsion) for use in various aspects of the life cycle of an oil and/or gas well are provided. In some embodiments, an emulsion or the microemulsion comprises water, a solvent, and a surfactant, and optionally, one or more additives, such as a co-surfactant or a linker. In some embodiments, a concentrate is provided which may be used to form an emulsion or microemulsion.