Study and Application of Fine Segmented Deep Acid Fracturing Technology for Horizontal Wells

doi:10.3969/j.issn.1006-6535.2022.02.021

Abstract

Abstract: Carbonate gas reservoirs in Sinian Dengying Formation, Gaoshiti-Moxi Area, Sichuan Basin is geologically characterized by ultra depth, high temperature, low porosity, low permeability, and high heterogeneity, bringing new challenges for reservoir stimulation. The existing stimulation technologies need to be further optimized. With laboratory experiments and theoretical studies, the reservoir fracturability was evaluated quantitatively, the acidizing fluid system and acid fracturing technologies were selected preferably, and parameters, such as acidizing fluid injection, displacement and injection intensity, were optimized. The fine segmented deep acid fracturing technology for horizontal wells was developed and applied in the field. The results showed that the technology achieved good results by application to 32 wells in carbonate gas reservoirs in Dengying Formation, Gaoshiti-Moxi Area, the average daily gas production of single test well was 79.8×10⁴ m³/d, and there were 10 wells reaching a daily gas production of 1 million m³/d. This technical system has achieved obvious fracturing effect and can provide technical support for the efficient development of carbonate reservoirs with low porosity and permeability.

Key words: horizontal well, acid fracturing, carbonate rock, Dengying Formation, Gaoshiti-Moxi Area, Sichuan Basin

CLC Number:

TE357.2

Miao Juan, He Xusheng, Wang Dong, Chen Hongyuan, Xiao Zhenhua. Study and Application of Fine Segmented Deep Acid Fracturing Technology for Horizontal Wells[J]. Special Oil & Gas Reservoirs, 2022, 29(2): 141-148.

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