| 摘要 |
FIELD: engines and pumps. ^ SUBSTANCE: elongated column assemble contains hollow pumping booms and jointing elements with an axle jointed together between the driving head arranged of the petroleum well surface and rotary pump arranged in the hole bottom. Every boom has, at least, one end with inner thread to mate the jointing element outer thread, e.g. a nipple. To optimise the strain distributions across the structural elements, the threads with various profiles are used, e.g. an asymmetric truncated cone and varying taper thread profiles. The collars to transmit torque have maximum possible mean diameter and cross-section to rule out accumulation of reactive torque in the column. A modified nipple has, preferably, a seal on its free end to reduce the risks of corrosion. A modified boom can have a number of orifices on each its end to increase flow of medium to forced out. ^ EFFECT: higher shear resistance, lower concentration of strains and lower accumulation of reactive torque. ^ 34 cl, 35 dwg, 1 tbl |
