页岩气水平井井筒压降计算新模型  

A New Model for Calculating Wellbore Pressure Drop in Shale Gas Horizontal Wells

作　　者：刘永辉[1] 江劲宏 罗程程[1] 王强 尹强 叶长青[3] 宋志鹏 唐雷 LIU Yonghui;JIANG Jinhong;LUO Chengcheng;WANG Qiang;YIN Qiang;YE Changqing;SONG Zhipeng;TANG Lei(State Key Laboratory for Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Gas Field Development and Management Department,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China;Engineering Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610017,China;Sichuan Shale Gas Exploration and Development Co.,Ltd.,Chengdu,Sichuan 641000,China;NO.1 Gas Production Plant,Sinopec Southwest Oil and Gas Company,Deyang,Sichuan 618000,China)

机构地区：[1]油气藏地质及开发工程全国重点实验室·西南石油大学 [2]中国石油西南油气田分公司气田开发管理部 [3]中国石油西南油气田分公司工程技术研究院 [4]四川页岩气勘探开发有限责任公司 [5]中国石化西南油气分公司采气一厂

出　　处：《钻采工艺》2023年第6期72-78,共7页Drilling & Production Technology

基　　金：国家自然科学基金面上项目“耦合压裂缝网扩展机制的页岩气藏动态模拟研究”(编号:51874251);国家自然科学基金面上项目“水平井气携液单元运动模型及井简积液预测研究”(编号:52374046);中国石油—西南石油大学创新联合体科技合作项目“川南深层与昭通中浅层海相页岩气规模效益开发关键技术研究”(编号:2020CX020000)。

摘　　要：井筒压力计算是气井生产动态分析、优化配产和排水采气设计的基础。页岩气井生产具有井口压力、产量、气液比等参数变化快的特点,全生命周期的井筒压降难以通过现有单一模型准确预测。文章以页岩气水平井为研究对象,开展空气—水两相管流实验,分析了表观气流速、表观液流速、井斜角、管径对持液率的影响规律。基于实验测试数据,引入滑脱速度,建立了实验条件下持液率计算新模型,修正气相/液相无因次准数来实现实验低压向气井高压条件转换。采用Mukherjee&Brill模型计算页岩气井井筒摩阻,形成了页岩气井井筒压力降计算新模型。经页岩气井现场生产数据验证,新模型平均相对百分误差为-5.48%,明显优于常用的气液两相管流模型。该模型对于页岩气水平井高效开发及生产动态分析提供理论技术支撑。Wellbore pressure calculation is the basis of gas well production dynamic analysis,optimization of production allocation and drainage gas production design.Shale gas well production has the characteristics of rapid change of wellhead pressure,production rate,gas-liquid ratio and other parameters,and it is difficult to accurately predict the wellbore pressure drop during the whole life cycle through the existing single model.In this paper,taking shale gas horizontal wells as research object,the experiment of air-water two-phase pipe flow was carried out,and the influence of apparent gas flow rate,apparent liquid flow rate,well inclination angle and pipe diameter on liquid holdup were analyzed.Based on experimental data,a new calculation model of liquid holdup under experimental conditions was established by introducing slip velocity,and the dimensionless number of gas phase and liquid phase was corrected to realize the conversion from experimental low pressure to gas well high pressure.The Mukherjee&Brill model was used to calculate wellbore friction of shale gas wells,forming a new prediction model for wellbore pressure drop calculation of shale gas wells.According to the field production data of shale gas wells,the average relative percentage error of the new model is-5.48%,which is obviously better than the commonly used gas-liquid two-phase pipe flow model.This model provides theoretical and technical support for the efficient development and dynamic analysis of shale gas horizontal wells.

关 键 词：页岩气 水平井 气液两相 井筒压降 计算模型 

分 类 号：TE37[石油与天然气工程—油气田开发工程]