In unconsolidated formations, the compliant rubber drain assembly of the
Saturn probe mechanically supports the borehole throughout the sampling
operation. Pressure drawdown is localized to the four elliptical ports, which
minimizes matrix stress while fluid is flowing. If any matrix disengages while
flowing fluid, the Saturn 3D radial probe is equipped with sandface filtering
mechanisms on each of the probes to prevent plugging of the system.
Successful pressure testing and sampling with no seal loss
The Saturn 3D radial probe was deployed in several wells in the field.
Multiple stations were tested and sampled in each of the wells, which have up
to 12% ovalization. Whereas conventional probes commonly experienced lost seals
in the rugose holes, the Saturn self-sealing probes maintained seal integrity
to support the borehole in the unconsolidated sandstone reservoirs. There was
no evidence of sand grains reaching the pumps.