Hilong’s Advanced Upsetting Technology After years of research efforts, Hilong has successfully developed its unique new upsetting technology, lifting its drill pipe upsetting quality to world-class standards. Hilong Sour service Drill Pipe The Hilong series of sour service drill pipe is a specialized drilling tool that is resistant to hydrogen sulfide stress corrosion, developed by Hilong Group specifically to meet the needs of oil and gas exploration and drilling operations containing sulfur or a high presence of sulfur. Hilong’s Arctic Service Drill Pipes are a drilling tool developed by the Hilong Group for application in low temperature environments in order to meet the needs of oil and gas prospecting operations in high altitude regions.