Enhanced recovery

Acid Fracturing and Hydraulic Fracturing Applied in a Single Well for a Deep Carbonate Reservoir

The paper describes a project in which extremely challenging stimulations were performed in a fractured tight carbonate in a complex strike/slip stress faulting regime with high tectonic stresses.

Outcrop complex subsurface structure with faults and fractures.
Outcrop complex subsurface structure with faults and fractures.
Source: SPE 226647.

Acid fracturing and hydraulic fracturing were used to stimulate and appraise a challenging deep, low-porosity carbonate reservoir with a complex combination of matrix background fractures and some large fault corridors and fault-associated fractures. The execution of the stimulations proved challenging because of the high strike/slip stress regime. Data from the prestimulation diagnostic tests was used to successfully plan and optimize each stimulation. Learnings and experiences for designing and execution of proppant fracturing, as an alternative to matrix or fracture acidizing in these complex carbonate formations, are presented.

Introduction

To date, five wells have been drilled in the appraisal field.

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