Geomechanical weakening with surface acting agents
a technology of surface acting agent and geomechanical strength, which is applied in the direction of fluid removal, chemistry apparatus and processes, and wellbore/well accessories, etc., can solve the problems of alteration in tensile strength affecting fracture creation and propagation properties, and achieves the reduction of fracture propagation pressure, fracture bifurcation index, and fracture toughness
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[0071]Three lab tests were performed on sandstone cores measuring tensile strength e.g., by the indirect (or “Brazilian”) method. The results showed that surfactants, such as SDS (ionic), CHAPS (Zwitterionic), and Tween-20 (non-ionic) did cause geomechanical weakening. These preliminary tests indicated proof of concept, and suggest that it is worth pursuing additional tests to confirm the value of surfactant use to decrease fracture propagation pressure, and / or fracture length.
[0072]Although various embodiments of the method and apparatus of the present invention have been illustrated in the accompanying Drawings and described in the foregoing Detailed Description, it will be understood that the invention is not limited to the embodiments disclosed, but is capable of numerous rearrangements, modifications and substitutions without departing from the spirit of the invention as set forth herein.
[0073]It should also be noted that in the development of any such actual embodiment, numero...
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