高压压裂油套环空井压降计算

High Pressure Casing Annulus Well Fracturing Oil Pressure Drop Calculation

应用达西公式、伯努利方程等建立了数学模型,进行压降计算的数值模拟;编写了压降计算程序,实现软件编程模拟,并针对63.5mm(2英寸)油管和76.3mm(3英寸)油管进行压降分析。结果表明:随着管径的增大,流速增大,沿程水头损失与局部水头损失均显著增加,最终导致压降增大;此压降若超过运行条件允许的范围,会造成压裂施工停止、油井停产、管道停输等严重事故,影响正常生产,因此对流体在环空管道中的流动阻力以及压降进行准确的计算至关重要。

By using Darcy formula,Bernoulli equation mathematical model is established, the pres- sure drop calculation of numerical simulation. The pressure drop calculation program was written and the software programming simulation was realized. 3 inches for 2 and a half inch tubing and tubing pressure drop is analyzed, with the increase of pipe diameter, flow rate increases, frictional head loss and the local head loss were significantly increased, eventually leading to the pressure drop increases. If the pressure drop exceeds the range of operating conditions,this will cause the fracturing construction stopped,the oil well production,and pipeline,such as serious accidents,af- fecting the normal production. So the fluid in the annular pipe flow resistance and pressure drop for the accurate calculation is of crucial importance.