A Study on Optimized Method of Gas Injection Volume of the Oxygen-reduced Air Flooding in Deep Heavy Oil Reservior

doi:10.11885/j.issn.1674-5086.2020.01.15.01

Abstract

Abstract: Lukeqin Oilfield adopts general gas injection in oxygen-reduced air flooding. There is no established method for optimizing gas injection, which results in great differences in oil production increase effects between different types of single wells. The pore volume multiples of gas injection in the dominant channel are determined through physical model experiments; numerical simulation experiments are carried out to propose the concepts of the gas injection/inlet coefficient α and β in the dominant channel, which are combined with the volume of the dominant channel to optimize the throughput. By simulating the oil exchange rate during the throughput of different gas injection volumes to verify the optimization results, an optimization calculation formula with theoretical guidance for the actual gas injection volume in the field is obtained. The experiments show that the optimal gas injection pore volume multiple is 0.20 PV, and the gas injection coefficient α of the dominant channel is 0.8, indicating that 80% of the gas enters the dominant channel, and the gas inlet coefficient of the dominant channel is 0.348, indicating that 1/3 of the well spacing to the production well is the distance the affected area covers. After the calculation of the gas injection volume optimization formula and the verification of the digital model, we conclude that the optimal gas injection volume of 4.5×10⁵ m³ is adequate. The optimization method combines the oil increasing mechanism of oxygen-reduced air throughput with the actual demand in the field, and has certain theoretical significance and field application value for the related design of oxygen-reduced oxygen throughput.

Key words: oxygen-reduced, huff and puff, air injection volume, dominant water flow channel, Lukeqin Oilfield

CLC Number:

TE327

GUO Xiaozhe, CAO Yufeng, TIAN Kai. A Study on Optimized Method of Gas Injection Volume of the Oxygen-reduced Air Flooding in Deep Heavy Oil Reservior[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(2): 110-116.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2020.01.15.01

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