Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2022, Vol. 44 ›› Issue (3): 93-101.DOI: 10.11885/j.issn.1674-5086.2022.01.25.02

• A Special Issue of Efficient Development Technologies for Tight Sandstone Gas Reservoirs in Western Sichuan • Previous Articles     Next Articles

Quantitative Evaluation for Development Potential of Remaining Gas in Tight Sandstone Gas Reservoirs

ZENG Yan1, CAO Tingkuan2, GAO Wei2   

  1. 1. Development Management Department of Southwest Petroleum Branch, SINOPEC, Chengdu, Sichuan 610041, China;
    2. Exploration & Production Research Institute of Southwest Petroleum Branch, SINOPEC, Chengdu, Sichuan 610041, China
  • Received:2022-01-25 Published:2022-07-13

Abstract: The distribution of remaining gas in tight sandstone gas reservoir is complex, and it is difficult to quantitatively evaluate the development potential, which restricts the development and adjustment of gas reservoir at the middle and late stage. Aiming at problem of quantitative characterization of remaining gas, taking Js2 gas reservoir in Xinchang Gas Field as an example, comprehensive numerical simulation and actual encryption adjustment well development effect and economy, the factors affecting the remaining gas potential are formation pressure, reserve abundance and permeability in descending order. The remaining gas potential index is defined to comprehensively consider the contribution of the above factors to the economically recoverable reserves of infill wells in the remaining gas areas. Then, the mathematical expression which can be used to describing the relationship between remaining gas potential index and economic recoverable reserves of infilled horizontal wells is established. So, the quantitative characterization of the development potential for remaining gas is realized. For Js2 gas reservoir in Xinchang Gas Field, case analysis shows that horizontal wells can be used to infill the areas if the remaining gas development potential index of is greater than 0.7. Accordingly, one favorable area is selected in the northeast of J$s_2^4$ gas layer, and the reserve of the remaining gas area with high water cut in the edge is effectively utilized by infilling a horizontal well. The quantitative evaluation method for remaining gas is verified by the production of the infilling horizontalwell.

Key words: tight sandstone gas reservoir, numerical simulation, remaining gas, development potential, quantitative evaluation

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