川南深层页岩气井采用测-采-输一体化作业模式,实现了降成本、减排放、快投产、早收益的开发目标,但在一体化作业实施中大量采用矿场经验做为决策依据,缺乏通用指导性。针对压后焖井、返排制度及排采对策三方面内容开展了覆压核磁共振渗吸、渗透率应力敏感及气液两相渗流实验,模拟计算了井筒流态及压力剖面分布,并开展了现场30余口气井排采效果评价。研究结果表明：压裂液渗吸进入储层有利于提高页岩裂缝复杂程度,川南页岩气井最优焖井参考周期为4~10 d;形成6阶段返排优化方案,建立了压后排采指导图版。确定以流态转变时机为下油管及人工举升工艺介入时机,油管最佳下入位置为井斜70°~85°,提出了排水采气对策。研究结果对于指导深层页岩气井压后生产管理及排采技术具有较好的指导意义。

The shale gas fields in Southern Sichuan are developed in an integration mode of testing, production and transmission, which has realized the development goals of cost reduction, emission reduction, fast production commissioning and early returns. However, a lot of empirical practices serve as reference of decision-making during implementation of integration practices. There is a lack of general guidance. In order to study the post-frac soaking, the flowback system and the drainage measures, the experiments of overpressured NMR imbibition, permeability stress sensitivity and gas-liquid two phase percolation are conducted, the flow regime and the distribution of pressure profile are simulated, and the discharge and production effect of more than 30 wells in Southern Sichuan shale gas field has been evaluated. The results show that the entry of fracturing fluids into reservoir through imbibition is beneficial to increasing the complexity of shale cracks, and the optimal shut-in time of Southern Sichuan shale gas field is 4~10 days. Meanwhile, a six-staged flowback system is formed, and a post-frac drainage guide chart is established. It is determined that tubing and manual lifting should be implemented when the flow regime changes and the tube should be installed at the well deviation of 70° ~ 85°. Besides, the drainage strategy is also proposed. In general, the research results are of great significance for guiding post-frac production control and drainage technology.