Spiral drill collar Spiral drill collars are manufactured three spiral groves on slick drill collar, which is used reduce contact area to avoid efficiently bit sticking form differential pressure.....
Jiyuan Sanhe Zhengyuan Petroleum Machinery Co., LTD is a high-tech enterprise specializing in manufacturing drilling tools of Zhengyuan Brand for petroleum and geological exploration. Our main....
Drill collar Drill collars are made of 4145H modified Cr Mo alloy steel, which are manufactured according to API Spec 7 and SY/ T 5144 standard. We can supply all kinds of connections for our drill....