METHODS FOR FORMING BARRIERS IN WELL ZONES AND REDUCING PROPPANT BACKWASHING Russian patent published in 2023 - IPC E21B43/267 

FIELD: well stimulation.

SUBSTANCE: group of inventions relates to the field of well stimulation to facilitate production, more specifically, to proppants used in such stimulation, in particular, in a method for treating a part of a wellbore, as well as in a method for forming a near-wellbore zone barrier and for creating the barrier itself. A method for treating a portion of a wellbore includes introducing a first treatment fluid into a distal zone of a subterranean formation, the first treatment fluid comprising a first proppant; introducing a second treatment fluid into a downhole zone of the subterranean formation, the second treatment fluid comprising a second proppant different from the first proppant. In this case, the wellbore zone extends on average 0-10 m from the wellbore, and the far zone extends on average 10-300 m from the wellbore. Moreover, the second proppant has an increased length and a reduced internal volume compared to the first proppant. Reducing the flowback of the first proppant into the wellbore while allowing fluid to flow into the wellbore by forming a wellbore barrier containing the second proppant. Also proposed is a barrier created by the above method, and a method for forming a barrier near the borehole zone.

EFFECT: effective performance.

16 cl, 12 dwg