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小井眼环空水力学与常规井区别很大。在室内小井眼环空实验架上对小井眼环空压力损失进行了试验研究。模拟环空钻井液返速、钻柱旋转速度、钻柱偏心弯曲程度、钻井液性能和钻具接头等对压耗的影响，取得上千组试验数据。试验结果表明：随环空返速增加，小井眼环空压耗增加很快；在转速较低时随转速增加压耗反而有所下降，但下降幅度很小，在转速较高时钻柱旋转时压耗的影响很大；随偏心度增大，环空压耗降低；随环空间隙减小，压耗对钻柱旋转变得更为敏感；随钻井液幂律流性指数增加，环空压力损耗增大；随宾汉塑性粘度增加，环空压耗增加；随钻井液密度增加，环空压耗增大；钻具接头对小井眼环空压耗的影响很显著。
Slimhole annulus hydraulics is very different from conventional wells. Experimental study on the annulus pressure loss of slim borehole was carried out in the laboratory slim borehole annulus. Simulate the effect of annular velocity of return drilling fluid, the rotation speed of drill string, the eccentric bending degree of drilling string, drilling fluid properties and drill joint on the pressure loss, and get thousands of sets of experimental data. The experimental results show that with the increase of annular velocity, the annulus pressure of slimhole increases rapidly, while decreases with the increase of rotational velocity at low rotational speed, but decreases slightly, but decreases slightly. When the rotational speed is high, As the eccentricity increases, the annular pressure loss decreases. With the decrease of annulus clearance, the pressure loss is more sensitive to the rotation of the drill string. As the power law index of drilling fluid increases, the ring With the increase of plastic viscosity, the annular pressure loss increases. With the increase of the drilling fluid density, annular pressure loss increases. The influence of the drill joint on the annular pressure loss of the slim hole is significant.