Australian-based Samson Oil & Gas has completed the Maris 1-16H multi-stage acid stimulation.
The well is a horizontal open hole completion in the ratcliffe member of the Mississippian Madison formation and has produced 177,000 barrels of oil after it was initially drilled in 2004.
Samson acquired Maris 1-16H as part of a package of wells in an acquisition that closed in April this year and became its operator in June.
A multi-stage hydrochloric acid (HCl) / diversion product was designed and delivered by an oil service provider to treat the entire open-hole well bore.
The acid stimulation technique depends on a simple chemical reaction between calcium carbonate and hydrochloric acid, which dissolves the calcium carbonate and improves the permeability of the oil saturated reservoir.
The stimulation job placed 4,600 bbls of HCl acid and included the injection of 4,200 barrels of diversion agent, spacers and pads in addition to other water based fluids.
This was needed to complete the placement of acid in 19 stages across five zones.
An initial review of the pressure data observed that during the stimulation job the diversion agent worked as predicted.
However, the economic benefit of the stimulation can be determined only after the well is pumped for a stipulated period to remove the injected fluid.
