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Open Access

ARTICLE

Evaluation of Well Spacing for Primary Development of Fractured Horizontal Wells in Tight Sandstone Gas Reservoirs

Fang Li1,*, Juan Wu1, Haiyong Yi2, Lihong Wu2, Lingyun Du1, Yuan Zeng1
1 Exploration and Development Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu, 610041, China
2 Oil and Gas Resources Department, PetroChina Southwest Oil & Gas Field Company, Chengdu, 610000, China
* Corresponding Author: Fang Li. Email: email
(This article belongs to the Special Issue: Solid, Fluid, and Thermal Dynamics in the Development of Unconventional Resources )

Fluid Dynamics & Materials Processing https://doi.org/10.32604/fdmp.2023.043256

Received 27 June 2023; Accepted 21 November 2023; Published online 12 January 2024

Abstract

Methods for horizontal well spacing calculation in tight gas reservoirs are still adversely affected by the complexity of related control factors, such as strong reservoir heterogeneity and seepage mechanisms. In this study, the stress sensitivity and threshold pressure gradient of various types of reservoirs are quantitatively evaluated through reservoir seepage experiments. On the basis of these experiments, a numerical simulation model (based on the special seepage mechanism) and an inverse dynamic reserve algorithm (with different equivalent drainage areas) were developed. The well spacing ranges of Classes I, II, and III wells in the Q gas field are determined to be 802–1,000, 600–662, and 285–400 m, respectively, with their average ranges as 901, 631, and 342.5 m, respectively. By considering both the pairs of parallel well groups and series well groups as examples, the reliability of the calculation results is verified. It is shown that the combination of the two models can reduce errors and provide accurate results.

Keywords

Well spacing for primary development; tight gas reservoir; fractured horizontal well; threshold pressure gradient; stress sensitivity

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