Middle exhausting gas prevention oil-well pump and oil pumping technology thereof

Abstract

The invention discloses a middle exhausting gas prevention oil-well pump which is mainly composed of an upper pump cylinder, a lower pump cylinder, a plunger and a plunger connecting bar, wherein the upper pump cylinder and the lower pump cylinder are communicated, the plunger is arranged inside the upper pump cylinder, and the plunger connecting bar is connected with the plunger. The upper pump cylinder and the lower pump cylinder are connected in series through a connecting cylinder. At least one exhausting hole is formed at the side wall of the connecting cylinder. The invention further discloses an oil pumping technology based on the middle exhausting gas prevention oil-well pump. The plunger of the middle exhausting gas prevention oil-well pump is long, and due to an exhausting groove in the middle of each pump cylinder, oil inlet conditions are improved, fullness of a chamber of each pump cylinder at the lower portion of the exhausting groove of each pump cylinder is improved. Therefore, compared with a conventional pump, the middle exhausting gas prevention oil-well pump can effectively improve pump efficiency, an oil pipe and a sleeve are mutually communicated through the exhausting grooves in the middle of the pump cylinders, so that only the plunger is lifted out of the pump cylinders, steam huff and puff on a heavy oil well can be conducted without moving a tubing string. A secondary exhausting groove is formed in each pump cylinder, so that a drip needs not to be installed under a pit, and well repairing cost and environment pollution are reduced. Due to the fact that the exhausting grooves are formed on the pump cylinders, a pressure test cannot be conducted on the whole tubing string after well completion.

Description

technical field [0001] The invention relates to a medium-exhaust air-proof oil pump and its oil pumping process. Background technique [0002] Before the 20th century, the development of oil well pump technology at home and abroad was slow, and it was not until the middle of the 20th century that the whole barrel oil well pump was studied and produced simultaneously with the bushing type oil well pump. There are two technically controversial issues about oil well pumps: one is whether the whole barrel type oil well pump is better or the bushing type oil well pump is better; the other is whether it is better to have sand control grooves on the plunger or not to have sand control grooves. Until the 1980s, due to the significant improvement of the pump efficiency of the whole barrel pump, it is generally about 10% higher than that of the bushing pump, which prolongs the service life of the plunger pump barrel pair, and can save about 40% of high-quality steel. Instead of the b...

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