(under subclass 311) A process in which a liquid is introduced into the well from the top of the well.
(1) Note. The liquid may have come originally from the well itself.
SEE OR SEARCH THIS CLASS, SUBCLASS:
56, for a screen with a washpipe located outside of the screen.
157+, for a screen with a washing point or shoe.
278, for a process of graveling including cleaning.
285+, for a process of cementing, plugging or consolidating including cleaning. 300, for a process of cleaning involving chemical reaction of introduced materials, one of which may be the material to be removed.
301, for a process for removing a stuck object, grappling or fishing in the well.
302+, for a process of cleaning involving heating.
304, for a process of dissolving solid oil deposits.
305.1+, for a process of cleaning involving placing a fluid into the pores of a formation.
SEE OR SEARCH CLASS
175, Boring or Penetrating the Earth,
67, for processes of boring, which include reaming or enlarging the diameter of the bore, by fluid erosion.
507, Earth Boring, Well Treating, and Oil Field Chemistry,
100+, for processes of cleaning involving only inserting a material in the bore hole without any significant manipulative step. See the reference to Class 507 in Class 166, subclass 244.1, SEARCH CLASS, for a further discussion
