A process under subclasses 305.1+ in which fluid introduced into the pores of the earth chemically reacts with the earth or deposits in the earth to enlarge the pores.
(1) Note. The phrase "deposits in the earth" does not include material purposely placed in the earth such as cement or fracture props. It is intended to include material precipitated from the flowing earth fluid. Processes for attacking material purposely placed in the earth are classified on other bases and may comprise a part of a process involving cementing in subclasses 285+ or propping in subclass 280.
SEE OR SEARCH THIS CLASS, SUBCLASS:
259, for a process involving in situ combustion and also fracturing or attacking the formation.
271, for a process involving input and output wells and also fracturing or attacking the formation.
281, for a process involving separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation.
282, for a process involving a specific low fluid loss feature for a fluid attacking the formation.
304, for a process for dissolving solid oil deposits in the formation.
SEE OR SEARCH CLASS 175, Boring or Penetrating the Earth,
64, for earth boring processes involving a chemical reaction with the earth formation.
216, Etching a Substrate: Processes, appropriate subclasses for etching of various materials.
507, Earth Boring, Well Treating, and Oil Field Chemistry,
200+, for well treating compositions and mere methods of using them. See SEARCH CLASS note in Class 166, subclass 244.1, for a further discussion.
