这是一种利用油管做泵缸并在两段油管之间摆放机械密封的井下有杆无缸柱塞泵.可用这种泵来代替管式泵。其制造和修理成本比管式泵低得多,修理（更换机械密封、柱塞、凡尔）成本占新泵成本的30％～40％。而且客易组织批量生产。文中还介绍这种泵的技术特性。HCB型无缸柱塞泵的研制、试验台试验。工业试验以及在油田的推广使用。 This is a downhole rodless piston pump that uses tubing as a pump cylinder and a mechanical seal between the two tubing to replace the tube pump. It costs much less to manufacture and repair than a tube pump, and repairs (replacing mechanical seals, plungers, and coils) cost 30% to 40% of the cost of the new pump. And easy to organize mass production. The article also describes the technical characteristics of this pump. Development of HCB type cylinderless piston pump and test bench test. Industrial tests and the promotion of oil fields.