井控常见计算.doc

FORMULAS AND CALCULATION 公式和计算 1. Hydrostatic Pressure(HP) 静液柱压力 Hydrostatic pressure using ppg and feet as the units of measureHP（psi）=mud weight,ppg0.052true vertical depth(TVD),ft 举例： Example: mud weight =13.5ppg（泥浆密度） True vertical depth =12,000ft（垂深） HP=13.5ppg0.05212,000ft =8424psi （静液柱压力） 2．Annular Velocity(AV) 环空返速 AV,ft/min= Where Q =circulation rate , gpm 排量 Dh=inside diameter of casing or hole size ,in. 套管内径或井眼尺寸 Dp=outside diameter of pipe,tubing or collars,in. 钻具或油管的外径 举例： Example: pump output=530gpm Hole size=12-1/4 in. Pipe OD=4-1/2 in AV==100ft/min 3．Pump output,gpm,required for a desired annular velocity,ft/min 给定所需环空返速后如何确定泥浆排量 Pump output,gpm= Where AV =desired annular velocity,ft/min 所需要的环空返速 Dh =inside diameter of casing or hole size ,in 套管内径或井眼尺寸 Dp=outside diameter of pipe ,tubing or collars,in. 钻具或油管的外径 举例： Example:desired annular velocity=120ft/min Hole size =12-1/4 in Pipe OD =4-1/2 in PO= 4．Buoyancy Factor(BF) 浮力系数 Buoyancy factor using mud weight,ppg BF= 举例： Example:Determine the buoyancy factor for a 15.0ppg fluid : 确定泥浆密度为15.0ppg的浮力系数 BF = BF=0.77099 5．Pump Pressure/Pump Stroke Relationship 泵压和泵冲的简单换算关系 (Also Called the Roughneck’s Formula) Basic formula New circulating Pressure,psi= present circulating Pressure 举例： Example : Determine the new circulating pressure,psi using the following data: 确定新的循环泵压 Present circulating pressure =1800psi 现在的循环泵压 Old pump rate =60spm 现在的排量 New pump rate =30spm 新的排量 New circulating Pressure,psi = present circulating =450psi 新的循环泵压 6．Temperature Conversion Formulas 摄氏和华氏温度的转化公式 Convert temperature,Fahrenheit(F)toCentigrade or Celsius(C) C= 举例： example: Convert 95F to C: 将95F转换成C: C==35 C: 7．Slug Calculations 压钻杆重泥浆的计算 1）Barrels of slug required for a desired length of