合川气田井下节流气井动态分析新方法

A new method for performance analysis of downhole throttling gas wells in Hechuan gas field

合川气田属于我国典型的低渗透、低产气田,为提高开发效益,合川气田气井绝大多数已应用了井下节流工艺。但是,井下节流阻断了井口油压与井底流压的自然联系,给合川气田气井生产动态分析带来了极大挑战。为实现对井下节流气井井口动态监测资料的有效分析,文中以单井开采系统为研究对象,根据气藏、气水两相井筒管流和油嘴节流理论模型及动态分析特征化方法,建立了新型井下节流气井系统综合生产动态分析方法。该方法将传统动态特征化分析法扩展到井下节流气井,并通过对合川气田实际井下节流气井生产数据的拟合分析,验证了新方法的可靠性和实用性。

Hechuan is a typical low permeability and low production gas field in China.In order to improve the development efficiency of the gas field,most gas wells in Hechuan block have applied downhole throttling technology.However,the natural connection between wellhead oil pressure and bottom hole flow pressure is blocked by downhole throttling,which brings great challenges to the production performance analysis of gas wells in Hechuan block.In order to realize the analysis of wellhead dynamic monitoring data of downhole throttling gas wells,taking the single well production system as the research object,and combining the theoretical model and dynamic analysis characterization method of gas reservoir,gas-water two-phase wellbore pipe flow and choke throttling,a new comprehensive production dynamic analysis method of downhole throttling gas well system is established.This method extends the traditional dynamic characteristic analysis method into downhole throttling wells,and verifies the reliability and practicability of new method by fitting and analyzing the production data of actual downhole throttling gas wells in Hechuan block.