Early Stable Production Technology Policy for Low Permeability Fractured and Caved Carbonate Gas Reservoir Development

doi:10.11885/j.issn.1674-5086.2024.10.07.32

Abstract

Abstract: Carbonate rock oil and gas fields play a vital role in the global development of oil and gas resources, and the oil and gas output from carbonate reservoirs accounts for over 60% of the world's total production. Taking the Deng4 Gas Reservoir in the Moxi Block of Anyue Gas Field as an example, this reservoir features low matrix porosity, well-developed fractures and vugs, and strong heterogeneity. It is a typical low-permeability fractured-vuggy carbonate gas reservoir. During production, prominent challenges frequently emerge, including frequent gas well blockage, high risks of water influx and liquid loading, large variations in the stable production capacity of individual wells, and unbalanced reserve utilization. To achieve early stable production of the gas reservoir, systematic research was conducted focusing on blockage removal, water influx monitoring, hierarchical classification of gas wells, production allocation optimization and balanced reserve production. Two sets of blockage removal technologies for wellhead and downhole operations were established. Dynamic monitoring of water influx and identification of liquid loading were implemented. Gas wells were managed by hierarchical classification based on the K-means clustering algorithm. Combined with 3D geological modeling and numerical simulation, single-well production allocation was optimized and replacement production wells were deployed. Field application results show that the blockage removal treatments restored daily gas production by (148×10⁴ m³), with a cumulative incremental production of (1.83×10⁸ m³). After production allocation optimization, the stable production period of the gas reservoir was extended by 5.2 years, and the recovery factor during stable production rose from 6.14% to 9.45%. A total of 16 replacement production wells were deployed according to the distribution of remaining reserve abundance, which provides solid support for improving reserve utilization efficiency and realizing sustained stable production.

Key words: low-permeability fractured-vuggy carbonate gas reservoir, Deng4 Gas Reservoir, early stable production, blockage treatment & water invasion control, production allocation optimization

CLC Number:

TE371

OU Jiaqiang, CHEN Lin. Early Stable Production Technology Policy for Low Permeability Fractured and Caved Carbonate Gas Reservoir Development[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(3): 68-76.

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