鄂尔多斯盆地苏里格气田南区产水气井合理产量研究  

Rational production of water producing gas wells in the south area of Sulige Gasfield,Ordos Basin

作　　者：张海波[1,2] 王京舰[1,2] 靳锁宝 陈红飞[1,2] 王蕾蕾 Zhang Haibo Wang Jingjian Jin Suobao Chen Hongfei Wang Leilei(Exploration and Development Research Institute, PetroChina Changqing Oilfield Company, Xi＇an, Shaanxi 710018, China National Engineering Laboratory of Low-permeability Oil ＆ Gas Exploration and Development, Xi＇an, Shaanxi 710018, China Gasfield Development Department, PetroChina Changqing Oilfield Company, Xi＇an, Shaanxi 710018, China)

机构地区：[1]中国石油长庆油田公司勘探开发研究院 [2]低渗透油气田勘探开发国家工程实验室 [3]中国石油长庆油田公司气田开发处

出　　处：《天然气勘探与开发》2017年第3期72-77,共6页Natural Gas Exploration and Development

基　　金：中国石油重大科技专项"致密气藏开发重大工程技术研究"(编号:2010E-23)

摘　　要：合理产量是气田开发的重要参数,也是产水气井配产的重要依据。裂缝发育的岩溶型有水气藏是已开发气藏中最复杂的类型之一,在气藏开发过程中,随着地层压力降低,边、底水快速侵入,准确计算气井合理产量尤为困难。针对这一问题,基于渗流力学基本理论,结合Fevang气水两相拟压力表达式,推导产气、产水方程;并结合气水两相相对渗透率经验公式、水驱气藏物质平衡方程,建立产水气井地层压力预测模型,通过拟合产气量和产水量数据,求取气井地层压力。进而基于产水气井一点法产能预测、气液两相管流压降及气井临界携液理论,应用节点系统分析,建立产水气井合理产量计算新方法。现场应用结果表明:(1)产水气井地层压力预测模型计算的地层压力与实测地层压力一致;(2)产水气井合理产量计算新方法指导气井生产,可有效控制气井水侵速度,减少井筒积液,保持气井平稳生产。Rational production is an important parameter of gasfield development, and also the significant basis for production pro- ration of water producing gas wells. Karst-type edge- or bottom-water gas reservoir with fractures is one of the most complex types of gas reservoirs that have been developed. During the development of gas reservoirs, edge or bottom water invades quickly as the reservoir pressure declines, so it is quite difficult to calculate the rational production of gas well accurately. To solve this problem, gas production and water production equations were derived according to the basic theory of percolation mechanics, together with the Fevang expression of gas-water two-phase pseudopressure. Then, based on the empirical formula of gas-water two-phase relative per- meability and the material balance equation of water drive gas reservoir, the formation pressure prediction model for water producing gas wells was established. In this model, the formation pressure of gas wells is calculated by fitting the data of gas and water produc- tions. Finally, based on the productivity forecast of water producing gas wells with single-point method, the gas-liquid two-phase pipe flow pressure drop and the critical liquid carrying theory of gas well, a new method for calculating the rational production of water producing gas wells was established through nodal system analysis. Field applications show that the formation pressure calculated by the prediction model is consistent with the measured value. Moreover, the new method for calculating the rational production of water producing gas wells can guide gas well production, control the water influx rate effectively, reduce the wellbore liquid loading and keep the steady production of gas wells.

关 键 词：鄂尔多斯盆地 苏里格气田 产水气井 临界流量 节点分析 合理产量 水侵速度 

分 类 号：TE328[石油与天然气工程—油气田开发工程]