第40卷第2期
天然气勘探与开发
普光气田产水气井产能变化规律
余启奎
中国石化中原油田分公司勘探开发研究院
气用开发
摘要
随着有水气蔗开发的不断进行，水区地层水向气区推进至生产气井井底时，由于储层含水饱和度升高导致气相相对
渗透率降低，气相受伤害程度越大，气井产能下降幅度越大，严重影响气井正常生产。四川盆地普光气田主力层位下三叠统飞仙关组气藏生产动态显示气裁水体较活跃，随着地层压力不断下降，气藏边部先后5口气井见水，严重影响气产能。常规气井产能公式由于没有考虑产水造成的附加压降，导致产水气井产能的计算结果精度较低。以气并常规产能方程为基础，引入由生产并附近含水饱和度上升所产生的等效表皮系数S，修正气井产能公式中的原始表皮系数S，通过联立水气比、含水率，结合实测相渗曲线，利用气并水气比求解产水气并产能方程，实现有水气井产能实时确定，计算结果符合率超过90%；进一步通过统计产水气并水气比随时间上升规律，归纳出不同储层物性条件下，产水气并的产能变化规律，对类似气凝产水气并产能的预测具有参考作用。
关键字普光气田边水气藏水侵表皮
附加压降
DOI: 10.12055/gaskk.issn.1673-3177.2017.02.008
相渗
改进产能公式产能变化规律
Productivitychangelaws of water-producinggas wells inPuguang Gas Field
YuQikui
(Exploration &Development Research Institute, Sinopec Zhongyuan Oilfield Company,Zhengzhou,Henan450000 China)
Abstract: As water-bearing gas reservoirs are produced continuously, the relative permeability of gas phase decreases with the in-creasing of reservoir water saturation when the formation water of aquifers is driven to the bottom of gas producing well. The higher the damage degree of gas phase is, the greater the decline amplitude of gas well productivity is, and the normal production of gas well is impacted seriously. It is shown from the production performance of principal gas reservoirs (Feixianguan Formation of Lower Tri-assic) in the Puguang Gas Field that the water body is relatively active and 5 gas wells at the edge of gas reservoir produce water with eeaesasaanaoaas well productivity formula is used to calculate the productivity of water-producing gas wells, the calculation precision is lower, since it does not take into account the additional pressure drop caused by water production. In this paper, the equivalent skin factor (S) which is generated by the increasing of water saturation near the producing well was introduced to correct the original skin factor (S) of gas well productivity formula based on the conventional gas well productivity equation. By virtue of simultaneous water/gas ratio and water cut, combined with the measured relative permeability curve, the productivity equation of water-producing gas well is solved by using its water/gas ratio. Consequently, the productivity of water-producing gas wells can be determined in real time, and coincidence rate of calculation results is over 90%. The productivity change laws of water-producing gas wells in different reservoir physical prop-erties were summarized based on the further statistics on the rising laws of water/gas ratio of water-producing gas wells over the time It can be used as the reference for the productivity prediction of water-producing gas wells in similar gas reservoirs.
Keywords: Puguang Gas Field; Gas reservoir with edge water; Water invasion; Skin factor; Additional pressure drop; Relative perme-ability;Productivity formula modification; Productivity change law
普光气田位于四川盆地川东北断褶带东北段，生产层位主要为下三叠统飞仙关组和上二叠统长兴组，气层厚度165～410m，其中飞仙关组气层厚度96～360m，长兴组气层厚度20～148m，
是国内近年来发现的规模最大的整装礁滩相碳酸盐岩气田。普光气田储层非均质较强，局部溶蚀孔洞、裂缝发育，气水关系复杂，不同层系、不同礁体间气水界面不统一。其中飞仙关组气藏气水界
基金项目：国家科技重大专项“深层礁滩相高含硫气减稳定技术政策”（编号：2016ZX05017-001)。
第一作者：余启奎，1982年生，工程师，硕士：主要从事气藏工程研究工作。地址：（450000）河南省郑州市郑东新区金水东路 49号绿地原盛国际，电话：18639330927。E-mail:8333755@qq.com
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