In the process of oil production by pumping unit, high-pressure gas flow will appear suddenly in the well, If the wellhead is not equipped with a blowout preventer, the stuffing box alone is not enough to control the wellhead pressure and can easily cause a blowout. Therefore, it is necessary to ins

China's crude oil imports from Russia surged 55 percent in May from a year earlier to a record level, allowing Russia to replace Saudi Arabia as China's largest crude supplier. With Sanctions imposed on Russia over the conflict with Ukraine, Chinese refiners have taken advantage of discounts on Russ

In the process of oil production by pumping unit, high-pressure gas flow will appear suddenly in the well, If the wellhead is not equipped with a blowout preventer, the stuffing box alone is not enough to control the wellhead pressure and can easily cause a blowout. Therefore, it is necessary to ins