Negative pressure oil-well pump

Abstract

The negative pressure oil well pump as one sucker rod pumping equipment consists of fixed valve, traveling valve and pump barrel, and features that the plunger has upper part penetrating the central hole of the annular fixed valve mounted and lower part connected to the piston with inside traveling valve and one negative pressure cavity is formed between the traveling valve and the annular fixed valve. The present invention has the positive effects of double negative pressure area oil pumping resulting in reduced effect of gap ratio on pump efficiency and raised oil pumping efficiency; lowered liquid column pressure the plunger bears and up load of the oil well pump; and increased production pressure difference. The present invention provides improved negative pressure oil well pump structure and introduces double negative pressure area concept for oil well pump.

Description

Technical field

[0001] The invention relates to an oil field development oil well pump, in particular to a deep well rod oil well pump used in mechanical oil recovery. Background technique

[0002] Use oil pump to extract oil. Rod pump oil extraction is a more commonly used oil extraction method in oilfields at home and abroad. Rod pumps include: rod well pumps, tube well pumps. For example, Chinese Patent Publication No. 1556327 provides a double-cavity oil well pump, in order to separately pump the oil of two oil layers, avoid interference between the two oil layers, and extract oil from each layer respectively. Another example is Chinese patent announcement No. 1018279, which provides a suspended fixed oil well pump, in order to realize oil production in deep wells, and reduce the gravity that the oil well pump bears. Chinese Patent Publication No. 1128929 provides a metal elastic seal oil well pump. These are rod well pumps, each with its own characteristics. Genera...

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