.~ Contains intended gaseous phase at entry into wellbore
DEFINITION
Classification: 507/102
Contains intended gaseous phase at entry into wellbore:
(under subclass 100) Compositions which have an intentional gaseous phase present as they are initially placed in the wellbore.
(1) Note. Drilling fluids comprising the unintended presence of a gas, especially when such presence is avoided, are classified according to the other composition components.
(2) Note. A claimed composition with the intended creation of a gas inside the wellbore by in situ reaction is classified according to the components present at entry into the wellbore.
SEE OR SEARCH CLASS
166, Wells,
270, and 270.2 for injecting gaseous gel and surfactant; subclass 300 for well processes including the creation of a gas inside the wellbore by in situ reaction; and subclasses 401+ for injecting a gas or gas mixture.
175, Boring or Penetrating the Earth,
69, for processes comprising the use of liquid and gaseous materials and subclass 71 for processes of drilling with a gaseous fluid.
