A reservoir-damage-free encapsulated acid dually controlled by hydrogen ion concentration and temperature

Deep and ultra-deep carbonate reservoirs are the focus of exploration and development in future. However, the problems of high pressures in the treatment process, a limited effective etching distance of acid, great acid leak-off, and poor adaptability of the acid system are encountered in this type of oil and gas reservoir. The mechanism of acid fracturing stimulation under different processes and parameters is not clear. Aiming at these issues, the treatment schemes, process optimization, parameter optimization, and liquid system screening are studied in this paper, try to clarify the acid fracturing stimulation mechanism, and the following conclusions are drawn: The acid network fracturing could activate natural fracture to generate a complex fracture network to the greatest extent, and thereby a high output could be achieved; By using of weighted fracturing fluid, the wellhead injection pressure, as well as the performance of equipment required, could be effectively reduced; With 20% gelling acid and 20% retarded acid system, the non-uniform etching could be realized to improve the effective etching distance of acid liquid. The conclusions in this paper shed light on the acid fracturing treatment of deep and ultra-deep carbonate rocks.

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Research and application of acid fracturing stimulation mechanism in ultra-deep subsalt dolomite reservoir in Tarim Basin

Liu

Zhao

Qin

et al. 2022

J Petrol Explor Prod Technol

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An approach for the scalable production of macroporous polymer beads

Ferrer

Jiang

Menner

et al. 2022

Journal of Colloid and Interface Science

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Investigation of the artificial fracture conductivity of volcanic rocks from Permian igneous in the Sichuan Basin, China, with different stimulation method using an experiment approach

Luo

Chen

Zhang

et al. 2021

Journal of Natural Gas Science and Engineering

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A reservoir-damage-free encapsulated acid dually controlled by hydrogen ion concentration and temperature

Abstract: Oil and gas exploration and development extends from medium-low temperatures to high and ultra-high temperatures with the development of the oil and gas industry.

Cited by 5 publications

References 21 publications

Research and application of acid fracturing stimulation mechanism in ultra-deep subsalt dolomite reservoir in Tarim Basin

Research and application of acid fracturing stimulation mechanism in ultra-deep subsalt dolomite reservoir in Tarim Basin

An approach for the scalable production of macroporous polymer beads

Investigation of the artificial fracture conductivity of volcanic rocks from Permian igneous in the Sichuan Basin, China, with different stimulation method using an experiment approach

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