SU38993A1 - Through-piston pump for pumping crude oil - Google Patents

Description

The proposed pump with a through-piston for pumping crude oil refers to pumps using an auxiliary fluid separating the pumped oil from the working parts of the pump, and is characterized in that the pump cylinder is divided into two parts equipped with pipes separating the auxiliary fluid from pure oil the aforementioned parts have volumes of cavities such that during the piston stroke with the pipes attached to them, the auxiliary liquid is almost not mixed; This circumstance allows the use of a liquid that only slightly exceeds the pumped oil (for example, MgCU, CaCl) as an auxiliary separating liquid.

The drawing shows a longitudinal section of the proposed pump.

The pump cylinder is divided into two parts 55 and 34, in which the piston 55 moves. The latter has been lengthened at the top, where the discharge valve 56 is located. In the lower part of the pump there is a suction valve 57. To separate the piston 55, the separation pipe 55 is attached to Bepv. a separation pipe 59 is made at the lower extension,

(420)

and pipes 40, 41 for separation are attached respectively to parts 55 and 34. The clean, lubricating oil is designated 42, 43, and the separating liquid is 44, 45.

The action of the pump is as follows. During the upward stroke, the discharge valve 36 closes and the suction valve 57 opens. In this case, the column of pumped liquid 46, corresponding to the cross section of the piston, rises to the piston stroke, and at the same time a new portion of the liquid is sucked. In the course 55 upward, the separating pipes 55, 39 are pulled out of the separating liquid which remains stationary, because for the pure oil 43 fed above the piston 55 it is released having the same diameter as the cylinder, with the bell-shaped separating pipe moat1; About the same space on which oil was pushed out was pure. The same thing takes place under the piston 55. Here the separation of the ush pipe 39 is lowered into the separating liquid 45 and pushes the clean oil 42 up or down without moving the separating liquid itself.

Similarly, as wear marks from the sand present in the crude oil on the piston and cylinder appear, the same phenomena make you feel on the valve seats and on the valve guides. The latter, due to their continued movement in contaminated crude oil, are quickly polished, with the result that the correct direction is lost, and the seat is no longer suitable. Over time, the guides are triggered so that such a significant displacement of the supporting surfaces is obtained, at which, due to the high pressures occurring in the oil sucker rod pumps, the valve is clamped during its lowering and due to the displacement of the seat, remains unclosed and the pump is disabled.

To eliminate this drawback, a valve arrangement is used in such an arrangement that the valve guide constantly moves in pure oil, which also separates from the pumped liquid, a special one that does not mix with either the pumped liquid or the pure oil, such as mercury.

The subject of the patent.

A pump with a through-piston for pumping crude oil using an ESP-stimulating fluid that separates the injected oil from the working parts of the pump, characterized in that the pump cylinder is divided into two parts 33, 34 equipped with pipes 40, 41 attached to them, separating the auxiliary fluid from pure oil, which parts have volumes of cavities in which during the upward movement of the piston 55 placed in the part 34 and advancing of the pipes 5 fixed to the last (9, 39 of the auxiliary liquid 44, 45, this last almost does not move, that for the feed piston 43 is released the same amount of oil, a clean oil held pushed.

to the patent of the company "Universal company of electricity" by §8993

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