Enhanced Acid Fracturing with Improved Fluid Loss Control and Near Wellbore Diversion Increases Production in Kuwait
| Autor: | Alfredo Mendez, Andrea Nino-Penaloza, D. V. Gupta, Elizabeth McCartney, Mohammad Al-Othman, Malvika Nagarkoti, Alexander Pirogov, Anwar Alam |
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| Rok vydání: | 2017 |
| Předmět: |
Engineering
Waste management Petroleum engineering business.industry 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Wellbore 020401 chemical engineering Acid fracturing Production (economics) 0204 chemical engineering business 0105 earth and related environmental sciences |
| Zdroj: | Day 2 Tue, October 10, 2017. |
| DOI: | 10.2118/187444-ms |
| Popis: | Excess fluid leak-off, a challenge in Kuwait's naturally fractured tight carbonate formations, can compromise post-fracture productivity. Past acid fracture treatments, both for moderate and high temperature formations failed to generate the long differently etched fracture due to excessive leak-off. Treating zones with multiple perforated intervals in a single stage, particularly in pay zones with long heterogeneous rock properties can result in non optimal stimulation. Therefore, a new approach was developed with proven success to enhance fracture conductivity and overall production by efficient control of fluid leak-off. This novel approach incorporates the use of far-field and near-wellbore diverting systems into the acid fracture design. These solid particulate diverters (SPD) include low and high temperature systems that provide enhanced near-wellbore diversion in both case and open-hole applications. The SPD are designed to bridge across perforations and fractures in the higher permeability zones, diverting the stimulation fluid into lower permeability zones. A smaller sized multi-modal distribution of SPD controls the fluid in narrower natural fractures and wormholes, deepening penetration of the stimulation fluid along the entire fracture length. The SPD agents are fully degradable and do not contribute to permeability loss of the created fracture or the perforated interval when production starts. The production of the wells where the SPD agents were applied were higher in comparison to expected production of offset wells where non-acid crosslinked fracturing pad stages alternated with gelled or emulsified acid, and visco-elastic surfactant (VES) slugs. Both crosslinked fracturing pads, VES and emulsified acid slugs do not effectly control live acid leak off. Two case histories, documenting successes where this new approach to acid fracturing has been applied in the Tuba and Middle Marrat formations, have superior production results that correspond to enhanced fracture geometry. |
| Databáze: | OpenAIRE |
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