The Immersed Ultrasonic Testing Method And Equipment For Trenchless Drill Pipe

Trenchless drill pipe is a very important component which connects the drill rig and bit.In the whole process of drilling, the trenchless pipe bears a variety of complex alternatingstress and corrosion by all kinds of corrosive medium, and defects such as crack, piercing andwear are prone to occur. Thus, the trenchless pipe is the weakest link and often causesengineering accidents. Inspecting the drill pipe defect in time can enhance the reliability ofdrill pipe in service; reduce the cost of drilling engineering. Therefore, research anddevelopment of trenchless pipe inspection equipment has extensive application value.First, the immersed ultrasonic testing method is chosen to inspect the trenchless pipe afterstudying the structure of trenchless pipe, the production process, common types of defects andcomparing the commonly used inspection method. Then, the inspection scheme for thecomplete set of equipment is drew up according to the proposed detection requirements, andthe difficulties in the process of equipment design and manufacturing are analyzed. Theinspection equipment design is completed by studying relative properties of water immersionultrasonic detection method and the influence of probe types and arrangements. After that,other auxiliary structure such as rocker arm, circulation water tank, pressure mechanism,transfer mechanism and institution are optimized. Finally, the equipment on-site installationand debugging is completed, and the inspection results are tested.Field experiment results show that the design of the immersed ultrasonic testingequipment for trenchless pipe can detect the artificial defects which in accordance with theAPI Spec5D standard, and fully meet the corresponding technical indicators.