Special Oil & Gas Reservoirs >

2023 , Vol. 30 >Issue 4: 122 - 130

DOI: https://doi.org/10.3969/j.issn.1006-6535.2023.04.015

Reservoir Engineering

Productivity Assessment of Tight Gas Wells after Fracturing based on Unstable Pressure Well Test Analysis

  • Wang Tao ,
  • Yu Haiyang ,
  • Zhao Pengfei ,
  • Li Jingsong ,
  • Liu Rumin ,
  • Kou Shuangyan ,
  • Wang Jing ,
  • Liao Shuang
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  • 1. State Key Laboratory of Oil and Gas Resources and Exploration of China University of Petroleum (Beijing), Beijing 102249, China;
    2. China Oilfield Services Limited, Tianjin 300450, China

Received date: 2022-12-18

  Revised date: 2023-04-26

  Online published: 2023-09-18

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Abstract

To solve the problem of difficultly predicting the productivity for tight gas reservoirs after fracturing, based on the seepage mechanism and considering the stress sensitivity of the formation and the effect of formation improvement after fracturing, a linear heterogeneous composite zone fractured well model applicable to the inversion of fracture pump-stop is established, the fracture parameters and formation parameters are determined by using the established model and numerical well tests, and the relationship between productivity and fracture scale before and after fracturing is established by applying SPSS regression method, to obtain the The relationship between productivity and fracture scale before and after fracturing was established by applying SPSS regression method, to obtain the productivity prediction method for tight gas reservoirs after fracturing. The study shows that the double logarithmic characteristic curves of shut-in pressure change after hydraulic fracture pump-stop can be divided into fracture linear flow stage, transition stage, interfacial flow stage, outer zone linear flow stage and boundary effect stage; the newly established productivity prediction method is applied to Well Block X in Yulin Gas Field, with the average error of productivity prediction of 16.1% and good applicability; the effects of different fracturing parameters on productivity are, in descending order, discharge volume, sand addition volume, and fracturing fluid volume, with the optimal fracturing discharge volume of 3.36-4.83 m3/min, the optimal sand addition volume of 56.95-77.66 m3, and the optimal fracturing fluid volume of 167.09-259.91 m3.The study results have certain guidance for optimizing the fracturing design and post-fracturing productivity prediction of tight gas reservoirs.

Key words： tight gas reservoir; pump-stop inversion; analytical model; numerical well test; production evaluation

Cite this article

Wang Tao , Yu Haiyang , Zhao Pengfei , Li Jingsong , Liu Rumin , Kou Shuangyan , Wang Jing , Liao Shuang . Productivity Assessment of Tight Gas Wells after Fracturing based on Unstable Pressure Well Test Analysis[J]. Special Oil & Gas Reservoirs, 2023 , 30(4) : 122 -130 . DOI: 10.3969/j.issn.1006-6535.2023.04.015

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