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南海琼东南盆地崖城13-1气田为我国海上第一个高产大气田,气田见水后产量下降幅度较大,迫切需要进行剩余潜力评价和综合治水措施研究。通过创新的水侵剩余气柱高度评价技术、水侵气藏动储量评价及水体活跃程度判别技术等水侵宏观评价技术研究,结果表明崖城13-1气田仍有较大的剩余潜力和治水需求。在此基础上,通过见水井携液影响因素分析和综合堵水层位确定等技术,采取降压生产和更换小直径油管排水采气、堵水及补孔等综合治水措施,提高了单井产能,有效地减缓了气田产量递减,预计可累增气25亿m3左右,极大地稳定了下游用气信心。本文研究结果对海上气田水侵气藏剩余潜力评价和治水措施决策具有重要的借鉴意义。
The Yacheng 13-1 gas field in the Qiongdongnan Basin in the South China Sea is the first high-yielding gas field in China. After the seepage of the gas field, the yield dropped greatly. Therefore, it is urgent to evaluate the residual potential and to study the integrated water control measures. Through the innovative technology of evaluating the residual gas column height, the assessment of the reserves of water invaded gas reservoirs and the identification of water activity level, the results show that there is still a large residual potential and water control in Yacheng 13-1 gas field demand. On the basis of this, through comprehensive analysis of influential factors such as carrying liquid in the well and determination of the integrated water-blocking layer, comprehensive water-saving measures such as step-down production and replacement of small-diameter tubing for drainage and gas recovery, Production capacity, effectively reducing the production decline in the gas field is expected to accumulate about 2.5 billion cubic meters of gas, which greatly stabilizes the downstream gas confidence. The results of this study are of great significance to the evaluation of residual potential of water-inflated gas reservoirs and decision-making of water control measures in offshore gas fields.