October 2015, first Piezoelectric type Vertical VSP (PiezoVSP) job (one Zero-offset source and one offset-VSP source) had been
finished successfully by Geo-Vist in Xinjiang, China.
PiezoVSP got satisfied data in both casing and openhole interval. No arms and 48 mm OD design reduces operation risk
and improve efficiency.
PiezoVSP is especially used for hostile environment. It can also through pipe, even though special bit, may instead of Seismic
While Drilling (SWD) sometime.