HR-2635 Hydrogen Sulfide Scavenger Reduces HSE Risk and Operating Costs in Eagle Ford Shale

Manage hydrogen sulfide in sour wells

Hydrogen sulfide is naturally produced from the Eagle Ford Shale. The levels can range from a few ppm up to 20,000-ppm hydrogen sulfide and must be reduced to below pipeline gas specifications, which are typically less than 4 ppm. In addition to reducing product value, hydrogen sulfide exposes producers to environmental and safety risk and increases the chance of corrosion.

In one field, production flows through a three-phase allocation separator where gas discharge is comingled with other gas production streams and sent through a custody transfer to a third-party midstream company. When the midstream company altered the incoming gas stream KPIs, the cost of the producer’s H₂S scavenging program significantly increased.

Apply HR-2635 hydrogen sulfide scavenger to treat gas, reduce costs

The operator tasked Schlumberger with lowering overall treating cost and improving the treating efficiency of hydrogen sulfide. Schlumberger recommended HR-2635 hydrogen sulfide scavenger, a concentrated triazine formulated to convert H₂S into a water-soluble, noncorrosive, and nontoxic product.

HR-2635 scavenger is formulated to reduce the potential for calcium carbonate scale precipitation common with most triazine products by incorporating a thermally stable phosphonate scale inhibitor into the finished formulation.

The team provided targeted, direct injection of HR-2635 hydrogen sulfide scavenger and implemented a robust monitoring and optimization program.

Reduced H₂S levels to gas pipeline specifications

Schlumberger injected HR-2635 scavenger into two individual gas streams and a comingled gas header system upstream of the custody transfer with production flow rates ranging between 36 and 43 MMcf/d and H₂S levels ranging from 80 to 95 ppm. HR-2635 scavenger effectively reduced H₂S levels to the required gas pipeline specification while maintaining process H₂S scavenging efficiency. The application also reduced the producer’s chemical expenditure by 56%.