NGP Energy Technology Partners has invested in Managed Pressure Operations International, an oilfield services company operating in Asia and Texas.

Terms of the deal were not disclosed and calls seeking comment were not acknowledged by press time. Managed Pressure was advised by Growth Capital Partners and law firm BoyarMiller. Bruce Schulman, managing director with NGP, worked on the deal with the private equity firm.

Managed Pressure, with operations in Singapore, Texas and Indonesia, is expected to continue its international expansion, Schulman said in a statement.

NGP has been active in recent months. In July, its Renewable Energy Group, a maker of biodiesel, acquired Tellurian Biodiesel and American BDF, plants that convert cooking oil into sustainable fuel. The growing platform already has a combined production capacity of more than 200 million gallons.

The NGP Energy Capital Management is investing out of its 2005-vintage, debut fund, NGP Energy Technology Partners. The firm raised $496 million for the vehicle. 

NGP has invested in other oilfield services and technical companies including DynaPump, GeoDigital and Renewable Energy Group, among others. The energy-centric PE firm also has multiple green energy investments.

Energy deals have been the most prevalent of all sectors in 2010 in terms of value, even with blowback felt from the BP oil spill. Foreign strategics and private equity firms have been the most active buyers in the US lately. Among them are Reliance Industries, the India-based company, Wellspring Capital and Energy Capital Partners.