Dongying zerui mechanical manufacturing co.,ltd, one of the backbone enterprises of petroleum drilling and production equipment inChina, was established in 1941, with 82 years of experience up to now.Mainly engaged in research, development, manufacturing and service of land and offshore oilgas exploration anddevelopment equipment, covering drilling equipment, cementing equipment, workover equipment, fracturing equipment,coiled tubingunits, snubbing rigs, offshore equipment and high pressure fuid control products.