Petroleum Exploration and Development >

2022 , Vol. 49 >Issue 1: 144 - 155

DOI: https://doi.org/10.1016/S1876-3804(22)60011-9

A reservoir drying method for enhancing recovery of tight gas

  • Liehui ZHANG ,
  • Yu XIONG ,
  • Yulong ZHAO ,
  • Hongming TANG ,
  • Jingjing GUO ,
  • Chunsheng JIA ,
  • Qiang LEI ,
  • Binghe WANG
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  • 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
    2. Institute of Exploration & Exploitation, PetroChina Yumen Oil Company, Yumen 735019, China

Received date: 2021-04-13

  Revised date: 2021-12-20

  Online published: 2022-03-04

Supported by

National Natural Science Foundation of China(51534006)

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Abstract

Based on the study of damage mechanisms of generalized water blocking and related water-blocking removal methods, the drying agents for enhancing tight gas reservoir recovery were developed, and the basic properties, injection mode and drying effect of the drying agents were evaluated. The chemical effect, thermal effect, salt resistance, salt resistance formulas and delay mechanism of the drying agent systems for different types of tight reservoirs were investigated through lab experiment. The solubility and solubilization properties of supercritical carbon dioxide on drying agent systems were tested. The injection mode of dissolving drying agent in supercritical carbon dioxide was proposed. The mechanisms of supercritical carbon dioxide with water in micropores of formation matrix were analyzed. Micro-pore structures and seepage characteristics of reservoir before and after drying were compared. Based on the characterization in combination of NMR and laser etched pore structure model, drying effects of the drying agents on bound water of different occurrences were evaluated qualitatively and quantitatively. Lattice Boltzmann method was used to evaluate the influence of drying effect on gas micro-seepage ability. The influence of drying effect on productivity and production performance of gas well was analyzed by numerical simulation. The drying effect can greatly reduce water saturation of tight reservoir and improve the gas seepage capacity in near wellbore and fractures. This work can provide guidance for developing new measures in enhancing recovery of tight gas reservoirs.

Key words： tight gas; reservoir drying; enhancing gas recovery; water-blocking removal; drying agent; seepage ability

Cite this article

Liehui ZHANG , Yu XIONG , Yulong ZHAO , Hongming TANG , Jingjing GUO , Chunsheng JIA , Qiang LEI , Binghe WANG . A reservoir drying method for enhancing recovery of tight gas[J]. Petroleum Exploration and Development, 2022 , 49(1) : 144 -155 . DOI: 10.1016/S1876-3804(22)60011-9

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