2 litres of oily brine ? A ball-valve bailer, capable of storing...

2 litres of oily brine ?

A ball-valve bailer, capable of storing up to 3.4 Lof liquid, attached to a wireline truck was used to retrieve samples from the formations of interest using existing perforations in historical oil and gas wells.•A mixture of brine and minor volumes of hydrocarbon liquidsretrieved from the bailer werepoured into aclean bucket and then into a2,000 mL separator funnel to separate hydrocarbons from water. After 5-10 minutes of allowing for hydrocarbon/brine separation, a 200-300 mL aliquot of the brine was captured from the separation funnels to be analysed with an AquaTroll 500 water multimeter. The Aqua Troll was factory calibrated upon shipment and re-calibrated upon arrival for high conductivity brines (~100,000μs/cm). After 30-40 minutes of allowing for hydrocarbon/brine separation, the brine separated was collected in a HDPE sampling bottle with minimal headspace and transported in a cooler on ice.•Sampling equipment (e.g. bucket, beakers, separation funnels, etc.) was thoroughly cleaned with soap and water and rinsed 3x -4x with distilled water between sample points.•The sample retrieval method used only samples accumulated fluids in the immediate wellbore and is not always an accurate representation of the native brines in the adjacent targeted geological formations. In this case, it is possible that Mandrake will carry out a future brine sampling campaign that improves sample confidence by using a swabbing rig that allows for bigger