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1972年美国有油井03505口,机械采油占92%,每10口采油井中有9口机械采油井。机械采油井中:有杆泵抽油井占77%气举井占11%,水力活塞泵抽油井占9%,电动沉
In 1972, there were 03,505 oil wells in the United States and 92% by mechanical oil recovery. There are 9 mechanical oil wells in every 10 oil wells. Mechanical oil wells: rod pumping wells accounted for 77% gas lift wells accounted for 11%, hydraulic piston pumping wells accounted for 9%, electric Shen