Mechanical methods of flow-diverting agents during acid treatment

Abstract

An effective diversion technique is a crucial component in all acid stimulation jobs, which allows us to achieve full zonal coverage and thereby achieve the treatment objectives. In the process of acidizing heterogeneous formations, it is necessary to change the direction of the fluid to the target interval, i.e., the interval with low permeability, to ensure an even distribution of pumped fluids throughout the formation. This is because in heterogeneous formations, due to the different permeability of the layers, highly permeable wormholes can be treated with acid, and wormholes with low permeability can remain untreated. The article describes the technological features of methods of flow-diverting agents (diversion methods) used to change the flow distribution to prevent this problem, i.e. methods of optimal acid placement. In the article, one of the mechanical methods of flow-diverting agents, the Coil tubing technology, is considered and its effectiveness is determined by conducting quantitative experimental studies.