Speaker
Description
Acid fracturing is a technique that enhance the petroleum and natural gas production in carbonate formations. In fracture-hole carbonate reservoirs, the acid-etched fracture shape is unpredictable with the influence of the multi-holes structure. Based on the carbonate specimens from Sichuan, China, a series of physical and numerical simulations were carried out to study the interaction mechanism between acid-etched fracture and multi-holes structure. Simulations results show that: (1) Compared with hydraulic fracture, the rock strength around the acid-etched fracture was reduced, which would make the acid-etched fracture more susceptible to the multi-holes structure in carbonate reservoir (2) During acid fracturing, the larger the radius of the holes and the closer it is to the original propagation path of the fracture, the more likely it is that the holes are connected into series. (3) A close group of holes would make acid-etched fractures turn propagation direction more easily than a single hole. The results provide suggestions to the acid fracturing operation in the carbonate reservoir, which will greatly increase petroleum production in carbonate reservoirs in the future.
| Country | China |
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