考虑压力计分辨率的探测半径公式  

The Formula of Investigation Radius Considering Resolution Ratio of Pressure Gauge

作　　者：石军太[1] 李相方[1] 李乐忠[1] 杜辉[1] 周建睿[1] 

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249

出　　处：《油气井测试》2012年第2期8-10,75,共3页Well Testing

基　　金：国家自然科学基金项目(50974182)内容

摘　　要：对于水平均质等厚无限大地层中一口油井定产生产,由渗流理论可知压力达不到绝对的稳定。实际测试中,所使用的压力计有分辨率范围,压力计所测压力在某一测试时间后不再变化,认为其达到了稳定。针对以上问题,通过理论推导,得出了压力计所测井底压力‘稳定’时所经历的时间公式,其数值与测试流量成正比,与压力计分辨率成反比;将井底压力‘稳定’时所经历的时间公式带入理论探测半径公式,可得到考虑压力计分辨率的新的探测半径公式。求解出干扰试井中观察井处压力‘稳定’所经历的时间公式,其数值与油井的测试流量、压力计分辨率以及观察井离油井的距离有关。该结论为油气井的测试工作制度的设计提供了理论依据。For case of constant-rate liquid production from a single well centered in a horizontal,homogeneous-acting,isopachous,and infinite reservoir,based on fundamentals of fluid flow in porous media,the bottom hole flowing pressure never stabilizes.In the actual testing operation,however,the gauge has a definite resolution value,and pressure values from the gauge will not change after a period, so it is considered to be stabilized.According to this situation,through theoretical derivation,a time formula referring to stabilized bottom hole pressure measured by gauge is attained,whose value is in direct proportion to the liquid producing rate,but in inverse proportion to the resolution ratio of the pressure gauge.Substituting this equation into the equation of investigation radius,another new formula of investigation radius can be derived.The value of the solved time formula for the pressure at the observation well during interference testing to be stabilized is related to the fluid producing rate,gauge resolution ratio and the distance between the producing well and the observation well.The conclusion will be applied as a reference in the design process of working system during well testing.

关 键 词：油井测试 压力计 分辨率 探测半径 干扰试井 

分 类 号：TE353[石油与天然气工程—油气田开发工程]