Special Oil & Gas Reservoirs >

2025 , Vol. 32 >Issue 6: 86 - 91

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.06.010

Reservoir Engineering

Evaluation of stratigraphic movable water in fluvial channel sandstone gas reservoirs and its impact on recovery

  • LI Mingqiu ,
  • ZHANG Guangdong ,
  • YU Peng ,
  • WANG Huiqiang ,
  • XU Weichong ,
  • SHI Erhan ,
  • FENG Yan
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  • 1. PetroChina Southwest Oil and Gas Field Company,Chengdu,Sichuan 610051,China;
    2. Southwest Petroleum University,Chengdu,Sichuan 610500,China

Received date: 2024-09-22

  Revised date: 2025-09-12

  Online published: 2025-12-31

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Abstract

During test production in the Sha-1 section of the Tianfu gas field,some wells encountered water,but it remains unclear whether movable formation water is present and how it affects recovery.To address this,study was made on the fluvial channel sandstone gas reservoir of the Tianfu Sha-1 section using laboratory gas-drive-water experiments,analysis of sealed core data and CT scanning to assess reservoir water mobility and movable intervals,clarifying the occurrence state of formation water in the porous medium.We also established a high-temperature high-pressure experimental simulation of movable water′s effect on gas-water two-phase deliverability was to evaluate how movable water influenced recovery.The study showes that the water saturations of three sealed cores(X211, X206, X212)all exceeded the irreducible water saturation of the experimental cores,indicating a coexistence of gas and water in the reservoir;average movable water saturations were 21.31%,18.41% and 7.93% respectively.After gas-drive tests,gas preferentially swept large pores,while formation water mainly occupies small pores-tighter reservoirs retained more water with higher bound-water saturation.At the same decline rate,as water saturation increased,gas recovery decreased,and movable water has a greater impact on low-permeability reservoirs.These results are significant for evaluating movable water and calibrating recovery in similar gas reservoirs.

Key words： fluvial channel sandstone; tight sandstone; formation water; water saturation; recovery factor; Tianfu gas field

Cite this article

LI Mingqiu , ZHANG Guangdong , YU Peng , WANG Huiqiang , XU Weichong , SHI Erhan , FENG Yan . Evaluation of stratigraphic movable water in fluvial channel sandstone gas reservoirs and its impact on recovery[J]. Special Oil & Gas Reservoirs, 2025 , 32(6) : 86 -91 . DOI: 10.3969/j.issn.1006-6535.2025.06.010

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