[newbie]

请问油嘴是不是相当于一个固定的阀门（导致一个额外的压力降）？
为什么要分成井下油嘴和地面油嘴，都放在地面不好吗？
试油时要更换多个不同直径的油嘴，这是指井下油嘴还是地面油嘴？
试油时要更换多个不同直径的油嘴，为什么不把油嘴设计成一个连续可调的像阀门一样的设备？

新手，没有现场经验，请大家指教。

[ENGINEER]

Downhole choke can 1) reduce the wellbore storage effect thus good for well test analysis, 2) keep pressure above the bubble/dew point pressure to avoid multiphase flow, thereby the sampling operation can give you represent samples, and 3) reduce the pressure drop required for well stream flows to surface.

Different choke diameters give you different bottomehole pressure and production rate, with these data you can estimate the reservoir inflow performance (IPR curve) and reservoir properties.

Valves do not give you the flowpath diameter, but you need flowpath diameter to calculate pressure drop, then calculate well productivity. with chokes, you know their diameters through them all kind of calculations become possible.

[newbie]

very clear, thank you!