Dongying jianxin petroleum company was founded in january ,2002,in the yellow river delta(shengli oil field ,the second largest oil field in Chian)------Dongying City ,shandong province.It engages in the designing,developing ,testing ,manufacturing ,repairing ,and drilling service.Its business covers drilling rig ,workover rig ,solid control equipment,drilling rig supporting and drilling strings and other equipment related with petroleum.