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产水致密气井动态储量评价新方法
引用本文:徐兵祥,陈岭,白玉湖,李彦尊,董志强. 产水致密气井动态储量评价新方法[J]. 科学技术与工程, 2022, 22(16): 6482-6487
作者姓名:徐兵祥  陈岭  白玉湖  李彦尊  董志强
作者单位:中海油研究总院有限责任公司
基金项目:国家重大科技专项(2016ZX05027-003)
摘    要:针对层内水来源的产水气井动态储量评价,分析了现有动态储量评价方法在产水致密气井中的适应性,对比了不同水气比时现有方法计算误差,在此基础上,建立了层内水来源的产水气井气水两相流流动物质平衡方程,形成了此类井动态储量求解流程,并运用理论模拟方法对新方法及流程进行验证。结果表明:层内水产出对气井储量评价特征曲线形态影响较小,但对储量计算结果具有一定影响;当水气比小于5m3/104m3,相对误差约5%,认为现有方法仍适用,但大于该值则不适用;新方法能有效减小误差,经验证,水气比11m3/104m3时误差在1.4%,能够满足工程应用的需要。方法应用于鄂尔多斯盆地东缘临兴区块,为该区产能准确认识、井距优化部署提供了理论方法。

关 键 词:产水  致密气井  层内水  动态储量  流动物质平衡
收稿时间:2021-08-09
修稿时间:2022-02-22

A new technique of reserve estimation in water-production tight gas wells
Xu Bingxiang,Chen Ling,Bai Yuhu,Li Yanzun,Dong Zhiqiang. A new technique of reserve estimation in water-production tight gas wells[J]. Science Technology and Engineering, 2022, 22(16): 6482-6487
Authors:Xu Bingxiang  Chen Ling  Bai Yuhu  Li Yanzun  Dong Zhiqiang
Affiliation:CNOOC Research Institute Co.,Ltd.
Abstract:For the water-production tight gas wells in which the flowing water is internal water in formation while not edge and bottom water, the applicability of current reserve estimation techniques are analyzed, and the error analysis has been done with different water-gas ratios (WGR). Based on this, a new flowing material balance equation considered the internal water-gas two phase flow has been established, and a procedure is proposed. This new technique has been validated using the theoretical modeling and showed good results. It is stated that the water-production has little effect on the specialized curves of reserve estimation, while has certain effect on the results of reserve estimation. When the WGR is lower than 5m3/104m3,the relative error is less than 5%,the current techniques can be used in this kind of gas wells. Conversely, the opposite is true. The new established technique can decrease the error and the error for example of WGR equals 11m3/104m3 is decreased to 1.4%. It is applied in LINXING area in east Ordos Basin and has been used an effective tool to understand the productivity and optimize the well spacing.
Keywords:water-production   tight gas well  internal formation water  reserve estimation  flowing material balance
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