Study on Stress Sensitivity Damage Evaluation in Tight Low-Permeability Gas Reservoirs

作者：Hengli Zhai, Xinghuo Yu, Qingjiangpeng Zhu, Tongyao Liang, Qirui Huang, Haizhu Wang, Bin Wang, Sergei Stanchits, Аlexey Cheremisin · 年份：2024 · DOI：10.56952/arma-2024-0787 · 被引用次数：1 · 研究领域：Hydraulic Fracturing and Reservoir Analysis、Hydrocarbon exploration and reservoir analysis、Drilling and Well Engineering

ABSTRACT: Current stress sensitivity evaluation experiments lack accuracy due to the absence of considering the dynamic impact of the slip effect. This paper uses a correction method for Klinkenberg permeability that accounts for the dynamic variation of the slip effect. Gas measurement evaluations are conducted using varying confining and pore pressure methods under in situ reservoir conditions, fitting permeability and effective stress, and establishing a stress-sensitive gas well productivity equation that considers eliminating the slip effect. The results indicate that as effective stress increases, the gas slip effect intensifies. The average damage rate of corrected permeability increases by 0.9% and 12.09% in the two methods, with the pore pressure variation method being closer to field conditions. The greater the stress sensitivity, the faster the decline in gas well productivity, and both excessively high or low bottom hole flowing pressure are detrimental to gas well production. By calculating data from a gas well in Linxing, the reasonable range of bottom hole flowing pressure is determined to be 13.07 MPa to 13.99 MPa, while the reasonable production pressure difference range is 1.29 MPa to 2.21 MPa. This provides effective guidance for the development of low permeability reservoirs and reservoir protection. 1. INTRODUCTION With the sustained and stable development of Chinese petroleum industry, the development focus has gradually shifted towards low-permeability ...