排水采气井井底压力测试计算方法研究与应用——油套环空物质平衡测压方法研究(之一)  

STUDY ON CALCULATION METHOD OF DOWN-HOLE PRESSURE TESTING IN DRAINAGE GAS RECOVERY WELLS AND ITS APPLICATION --Study on Material Balance Method of Pressure Test in Casing Annular

作　　者：吴芒[1] 文伯清[2] 

机构地区：[1]四川石油管理局钻采工艺技术研究院 [2]西南油气田分公司采气所

出　　处：《钻采工艺》2001年第6期23-25,共3页Drilling & Production Technology

基　　金：中国石油天然气集团公司"九五"科技工程项目 ( 970 5 0 6-2 )"

摘　　要：排水采气井 ,特别是油管产水、套管产气的工艺井 (如机抽、电潜泵 ) ,由于井下设备通常占据了油管通道 ,难以用压力计直接测取井底压力 ,而常规获取井底压力的方法大多采用回声仪探测法。在生产过程中 ,由于气体不断进入油套环空 ,环空中可能出现泡沫 ,失去明显的气液界面 ,此时 ,采用回声仪测探法确定气液界面进而推算井底压力遇到了很大的困难 ,因为不可能获取确切的气液界面深度。为了较为准确和方便地获得井底压力 ,首次把物质平衡法引入排水采气的环空测试中。文中对排水采气井油套环空物质平衡测压方法进行理论探讨 ,推导各种条件下拟液面长度的解析解 ,为测试计算井底压力作好理论准备。For the drainage gas recovery wells,especially for the wells where tubing string produce water or casing produce gas,it is difficult to have the value of down-hole pressure through pressure meters due to down-hole equipment which occupied the passage of tubing string,but the conventional method to got down-hole pressure is to adopt echo testing method mainly.In the process of production,gas comes into annular of tubing continuously,then foam perhaps appears ,and visible gas-liquid interface will lose.In this time,it is difficult to calculate the bottom hole pressure and determine the gas-liquid interface using conventional echo testing method,because accurate depth of gas-liquid interface can't be got.In this case,in order to get bottom hole pressure accurately and easily,material balance method is used in annular test in drainage gas recovery.This paper studies material balance method of pressure test in casing annular and gets solution of length of gas-liquid interface in various cases.It is the theoretical basis of bottom hole pressure testing.

关 键 词：排水采气井 井底压力 测试 计算方法 研究 应用 

分 类 号：TE375[石油与天然气工程—油气田开发工程]