大型高叠置致密砂岩气藏提高采收率技术

Enhanced Gas Recovery Technology for Large High-stack Tight Sandstone Gas Reservoirs

李华昌 黎华继 李峰 许鑫

LI Huachang LI Huaji LI Feng XU Xin

中国石化西南油气分公司采气三厂, 四川 德阳 618000

No. 3 Gas Production Plant, Southwest Petroleum Branch, SINOPEC, Deyang, Sichuan 618000, China

新场气田沙溪庙组气藏储层致密、特低渗、低孔，自然产能极低，主要通过人工压裂开发，通过系统分析影响气藏采收率的主要因素，形成了以气藏精细描述及分类评价为基础，建模—数模一体化的剩余气分布规律定量评价和利润为约束的剩余储量开发潜力评价为核心，井网立体开发及差异化对策优化为手段的提高采收率技术。研究结果表明，致密砂岩气藏依靠单一技术提高采收率非常有限，多种技术联合攻关能最大限度提高采收率，切实提高新场沙溪庙组气藏采收率31.71%。多轮次的气藏精细描述为提高采收率对策选择奠定了基础，复算储量误差率小于2%；剩余气定量描述及潜力评价为气藏加密调整及效益开发提供了可靠的保障，明确了气藏剩余气类型及其效益开发界限，提高采收率8.28%；多层组混合井网立体化开发和差异化开发对策是气藏实现提高采收率的主要手段，提高采收率23.43%。

The formation of Shaximiao gas reservoir in Xinchang Gas Field is tight, with ultra-low permeability, low porosity, and extremely low in natural productivity. It is mainly developed through artificial fracturing. By systematically analyzing the main factors affecting the gas reservoir recovery, a comprehensive technology was formed, which was based on the fine description and classification evaluation of the gas reservoir. The core was based on the distribution law of residual gas of the quantitative evaluation with the integration of modeling and simulation and the evaluation of the development potential of residual reserves constrained by profit. And the means was three-dimensional development of well pattern and optimization of differentiated countermeasures. The research results showed that it had limitation for tight sandstone gas reservoirs to rely on a single technology to improve the recovery factor, and the joint research of multiple technologies could maximize the recovery factor and effectively increase the recovery factor of the Shaximiao Formation gas reservoir by 31.71%. Multiple rounds of fine gas reservoir descriptions had laid the foundation for the selection of strategies for enhanced gas recovery, and the error rate of recalculated reserves was less than 2%. Quantitative description and potential evaluation of remaining gas provided a reliable guarantee for infill adjustment and benefit development of gas reservoirs, clarify the types of remaining gas in gas reservoirs and their benefit development limits, and he recovery was increased by 8.28%. The three-dimensional development and differentiated development strategies of multi-layer mixed well pattern were the main means to achieve enhanced gas recovery in gas reservoirs, and the recovery was enhanced by 23.43%.

10.11885/j.issn.1674-5086.2022.01.24.03