ABSTRACT:

As proved from both experimental tests and field applications, solid particulate diverters can be effectively used for in-stage fluid diversion and inter-stage fluid diversion during stimulations, including acidizing, fracturing and also re-fracturing. In general, re-fracturing efficiency and the complexity of the resulting fracture network are dictated by a combination of operational parameters and local geological conditions. The success of in-well fluid diversion is controlled by the particle characteristics (size, shape, concentration and mechanical properties) and the particulate slurry displacement inside a well (injection rate, fluid viscosity and duration). Full understanding of the underlying mechanism of particle jamming and plugging can aid to design and pump the particulate slurry adequately. These operational parameters can be optimized to maximize fluid diversion efficiency. The optimization, however, needs to be evaluated within the context of initial fracturing treatment, local geology, and subsurface conditions to truly enhance the re-fracturing efficiency. For instance, presence of poor initial completion design, fracture height containment anomalies, mega fractures (or faults) and high reservoir temperature can present re-fracture design challenges that need to be carefully addressed in re-fracture planning.

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