The Transient Pressure Testing And Analysis Technology Research For Horizontal Pump Wells

The technology of horizontal well and fractured horizontal well is an important method to develop the fields and to improve oil recovery.Horizontal well and fractured horizontal well make the fluid seepage process more complicated while improving its condition.The horizontal well test is an important means for understanding oil reservoir.It has important significance to analyze characteristics of horizontal well pressure and to obtain reliable reservoir dynamic parameters,which can provide guidance for reasonable development of reservoirs.Now oilfield usually adopts transient testing methods,such as pressure build-up and fall-off,which requires certain shut-in period and has great influence on production.For horizontal well without flowing ability,how to test and acquire pressure data in daily production is also a problem to be solved.This article applies variable rate test technique to horizontal pumping well and forms a complete set of methods of well test interpretation.Firstly,this article introduces the technological principle of the variable flow test process of horizontal pimping well and analyzes the computing method for calculating bottom pressure indirectly.In this passage,the accuracy of the computing method is verified and the test equipment is presented.It gives the applicable conditions of the test process.Secondly,it establishes the mathematical model of infinite reservoir and fractured horizontal well and solves the mathematical model by using source function so as to obtain the pressure distribution formula of horizontal well in corresponding conditions.It draws the dynamic curve of infinite reservoir and fractured horizontal well by means of the pressure formula,and analyzes the characteristics of each seepage in each flow period as well as the affecting factors of dynamic pressure curve.Finally,the variable flow test process is applied to actual production of horizontal pumping well in this paper.It explains the parameters,such as well-bore storage,skin factor and permeability,and the result satisfies the practical production.During the course of the test,it gives attention to production and provides powerful technical support for development adjustment,which has positive effects on high and stable yield for oilfield and makes an applied contribution.