高含硫复合气藏试井解释模型研究  

Research on well test interpretation model for composite gas reservoir with high sulfur

作　　者：王海涛[1] 寇祖豪 张烈辉[1] 郭晶晶[1] Wang Haitao;Kou Zuhao;Zhang Liehui;Guo Jingjing(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《油气藏评价与开发》2018年第6期24-27,44,共5页Petroleum Reservoir Evaluation and Development

基　　金：国家自然科学基金"基于高精度边界元法的多尺度多机制复杂缝网页岩气藏压裂水平井动态模拟"(51774243);国家自然科学基金"致密气藏储层干化;提高气体渗流能力的基础研究"(51534006);国家科技重大专项"长宁-威远页岩气开发示范工程"(2016ZX05062);国家科技重大专项"昭通页岩气勘探开发示范工程"(2017ZX05063)

摘　　要：高含硫气藏在开采过程中,当近井地带压力降低到临界值后,溶解在气体中的硫就会逐渐沉积并堵塞孔道,严重影响气井的产能。利用分形理论,基于高含硫气藏的硫沉积区和未沉积区建立了复合气藏模型。该模型考虑了井筒相分离、井筒储集效应、表皮系数以及硫沉积区渗透率变化等因素的影响,利用Stehfest数值反演得到真实空间下模型井底拟压力解,结合Visual Basic 6.0绘制井底拟压力及导数的双对数曲线,并就表皮因子、渗透率变化指数、流度比等因素进行了敏感度分析,所得结论具有重要的实际意义。During the development process of gas reservoirs with high sulfur, when the pressure near the wellbore reduced to a critical value, the sulfur particles precipitated gradually and cloged the pores and fractures, decreasing the productivity of gas wells.Based on the fractal theory, this model for composite gas reservoirs with high sulfur, consisted of inner region and outer region, wass established. Taking wellbore fluid phase separation, wellbore storage factor, skin factor and varying permeability into consideration and by the Stehfest numerical inversion method, this model solved the bottom hole pseudo-pressure solutions in real space. Then with the assistance of Visual Basic 6.0 programming, the log-log type curves for pseudo-pressure and pseudo-pressure derivative were obtained. Finally, the influence of some factors such as skin factor, varying permeability index and mobility ratio on type curves were analyzed. The results had some essential practical significance.

关 键 词：高含硫气藏 复合模型 渗透率解析式 相分离 试井曲线绘制 

分 类 号：TE373[石油与天然气工程—油气田开发工程]