Diverter Basket Tool with extension tube

The Sondex Diverter Basket Tool is used to divert all the flow in the wellbore through a small diameter spinner section. By reducing the flow area the fluid velocity is increased which makes the flowmeter able to detect low volumetric flowrates. Another advantage of using the DBT is that by forcing all the fluid to pass through the spinner housing, it can be channelled through the measuring window of a radioactive density tool by using an extender tube and baffle.

Description

Therefore, in multiphase flow, more accurate representations of true flow can be obtained. This is especially applicable to low rate and inclined wells and this has been verified in the field.

This combination of diverter tool and extension tube with baffle has been flow loop characterised. At flowrates above about 200BPD slip is limited and approaches zero. In this situation apparent holdup through the density tool and water cut are the same. This means that by removing slip velocity (which is often an estimation), zonal phase flowrates can be calculated by simply multiplying total flow by water cut and making PVT corrections.

Below 200BPD there is some slip. In this case flow loop derived characterisation charts (available from Sondex) are used to relate density tool apparent holdup to water cut.

The flowloop characterisation showed that even when there is a slight leak of the basket then the water cut measurements are valid.

Features

• Different tube sizes available to suit spinner diameter
• Combinable with other Ultrawire™ tools