WELL TREATMENT

摘要

Rapidly pulsed injection fracture acidizing. A method comprises rapidly pulsed injection of a high reactivity fracture treatment fluid mode or substage alternated with one or more low reactivity treatment fluid modes or substages.

主权项

1. A method comprising
injecting a treatment stage fluid into a subterranean formation above a fracturing pressure to form a fracture in the formation; successively alternating reactivity modes in the treatment stage fluid, in either order, between at least first and second reactivity modes to react with carbonate in the formation at different rates or times to unevenly etch surfaces of the fracture; sustaining injection of the treatment stage fluid during each of the first and second reactivity modes for a period of time from 5 seconds up to 2.5 minutes; repeating the successive alternation of reactivity modes for a plurality of cycles; and reducing pressure to facilitate fracture closure and form interconnected, hydraulically conductive channels between opposing fracture surfaces.