确定低渗透气井产能方程的简易方法——系统试井法  

A Simply Method To Determine The Low-Permeability Gas Well Deliverability Equation By Steady-State Well Test

作　　者：贾莛[1] 李亚玲[1] 

机构地区：[1]长庆油田分公司第五采油厂

出　　处：《低渗透油气田》2005年第3期16-18,共3页

摘　　要：系统试井是确定气井产能方程、无阻流量等的重要方法之一。为了简化系统试井工序，提高试井成果的可靠性，依据系统试井理论，根据气井二项式方程通式，应用每一工作制度的产量和对应稳定井底流压联立方程组，消去参数地层压力，以图解法得到稳定产能方程；若解该方程组，可直接得到产能方程系数、当前地层压力、无阻流量等参数。避免了低渗透气井长时间关井测试地层压力及因地层压力偏低而带来的误差。新方法的应用，无疑利于降低测试成本、加快工作进度、提高成果质量。Systematic well test, or steady-state well test, is one of important methods by which the open flow capacity of a gas well and the general expression of gas well deliverability equation are determined. In order to simplify the working procedure of steady-state well test and to improve the reliability of well test results, simultaneous equations can be established by using the output of each prorated production system and the corresponding steady bottomhole flowing pressure, and on the basis of the theory of steady-state well test and the binomial flow equation （or turbulent-flow equation） for gas well, eliminate the parameter - formation pressure, then the steady gas-well deliverability equation is gained by a diagrammatization method. Parameters such as the coefficient of gas well deliverability equation, the current formation pressure, and open flow capacity, etc. can be directly obtained from solving the simultaneous equations. Thus we can avoid errors caused from testing the formation pressure after long-time shut-out of the gas well and from low formation pressure. Application of the new method is helpful to reduce the cost of well test, to expedite the working plan, and improve the quality of the work.

关 键 词：低渗透 系统试井 二项式方程无阻流量 稳定产气量 井底流压 

分 类 号：TE373[石油与天然气工程—油气田开发工程] TE37