作者: Allen R. Petree
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摘要: A pump for circulating fluids downhole. The rotor of a positive displacement transmits torque from the upper drill string section to tool attached lower end pump. Bow springs prevent stator portion rotating in wellbore. Fluid is counterflowed up interior by through check valve into settling chamber. Cuttings or other solids settle out fluid and then pumped one more discharge ports lowermost string.