Acoustic guided wave testing of downhole pumping equipment elements

UDK: 622.276.5.05.002.56
Key words: pump-compressor tubes, pump rods, defects, acoustic guided wave testing
Authors: O.V. Muravieva, V.A. Strizhak, D.V. Zlobin, S.A. Murashov, A.V. Pryakhin, Yu.V. Myshkin (Kalashnikov Izhevsk State Technical University, RF, Izhevsk)

The article presents approaches to development of acoustic guided wave technology for rod blanks, pump rods and oil well tubing non-destructive testing and the results of industrial application of ADNSH and ADNKT defect detector developed at manufacturer companies and downhole pumping equipment elements service workshops.

The acoustic defect detector ADNSH designed for rod blanks and pump rods testing uses the pulse-echo method allowing to detect large local defects like dints, corrosion damage, overlaps, rolling skins. The acoustic defect detector ADNKT designed for pump-compressor pipes testing additionally uses the multiple reflection method based on receiving the echo-pulses multiply (5–10 times) reflected fr om external and internal defects and opposite ends of a pipe. The multiple reflections method allows to identify both local and extended along the pipe defects, improves the sensitivity to small-sized defects and decreases the uncontrollable dead-zone at the pipe end from wh ere the acoustic signal is radiated, whereby the testing is carried out only from one end of the pipe.

The industrial implementation of new acoustic guided wave testing technologies applied to pump rods and pump-compressor pipes makes it possible to eliminate the operation admission for elements with a reduced service life and to increase the service life of downhole pumping equipment; to extend the wells operation overhaul period due to the reduction in the number of underground repairs caused by pump rod breakages and pump-compressor pipe depressurizations; to get the increase in oil production by reducing the equipment downtimes and number of underground repairs; to raise the level of industrial and environmental safety in the enterprise.

The technology for acoustic guided wave testing of extended objects developed offers the following advantages: it doesn’t need the scanning procedure, the use of contact or immersion fluids and the tested object surface preparation; it has an excellent productivity; it’s sensitivity to defects is high enough regardless of their bedding depth and distance from the transducer; it allows to identify the most dangerous defects affecting the cyclic durability of pump rods and pump-compressor pipes.
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