RU2732650C1 - Downhole pumping unit - Google Patents

Abstract

FIELD: pumps.

SUBSTANCE: technical result in a pump unit comprising a pump, an inlet module, a gas separator and an electric motor with a hydraulic protection, is solved by the fact that the pump is radial-plunger, and the axial channel of its shaft is through, wherein from one shaft end fluid enters the channel through the inlet valve, and from the other one comes out of it through the outlet valve, wherein the valve seats are made in the form of a bushing with conical grooves for the locking elements, and in the conical grooves there are radial holes for liquid passage, besides, the locking elements are made in the form of elastic rings.

EFFECT: invention is aimed at obtaining technical result, which is manifested in improvement of energy efficiency of pumping units.

1 cl, 7 dwg

Description

The invention relates to submersible borehole pumping units and can be used to extract oil, water and other liquids from wells.

Known centrifugal, screw and other borehole pumping units (see site: www.borets.ru; www.novometgroup.com; www.rimera.com and others), including a pump, a gas separator (sand separator) and an electric motor with hydraulic protection.

The main disadvantage of these installations is that they all have low efficiency.

The closest in technical essence to the invention is a radial plunger pump, known from the patent RU 2610333 C1, IPC ⁶ F04B 1/04, F04B 47/06 dated 09.02.2017;

The main disadvantage of this invention is that it cannot be directly used as part of a downhole pumping unit, since this pump is not capable of pumping liquid with gas due to an unacceptable ratio of useful and harmful volume. To pump well fluid with gas with this pump, the gas must be separated, i.e. install a gas separator. Taking into account the fact that the inlet of the well fluid into the pump and the outlet from it are located on the same side of the axial channel, it is not possible to use a gas separator when pumping out the well fluid.

The objective of the invention is to obtain a technical result, expressed in increasing the energy efficiency of downhole pumping units.

The specified task in a pumping unit containing a pump, an inlet module, a gas separator and an electric motor with hydraulic protection is solved by the fact that the pump is radial-plunger, and the axial channel of its shaft is made through, and from one end of the shaft, the liquid enters the channel through the inlet valve, and from the other, it leaves it through the outlet valve, and the valve seats are made in the form of a sleeve with conical grooves for locking elements, and radial holes are made in the conical grooves for fluid passage, and the locking elements are made in the form of elastic rings.

The conducted scientific and technical analysis of the proposal and the state of the art indicates that the proposed technical solution for a specialist does not follow explicitly from the state of the art, while the features of the set forth are interrelated, are in causal relationship with the expected result and are necessary and sufficient for it. receiving.

The invention is illustrated by drawings, where:

in fig. 1 shows a frontal view of a pumping unit with a radial plunger pump in section;

in fig. 2 and FIG. 3 shows an enlarged sectional view of a radial plunger pump;

in fig. 4 and FIG. 5 shows cross-sections of a radial plunger pump at the initial position of the shaft;

in fig. 6 and FIG. 7 shows cross-sections of a radial plunger pump when the shaft is rotated by 45 °.

The downhole pumping unit (see Fig. 1) consists of a radial plunger pump 1, a gas separator 2 (input module) and an electric motor with hydraulic protection 3. A radial plunger pump (see Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6) contains a housing 4 with a cam sleeve 5, inside of which there is a shaft 6 with a through axial channel 7 for supplying and discharging the pumped liquid to the plungers 8. The plungers 8 are installed in cylinders 9 with the possibility of axial movement in them. The cylinders 9 are pressed into the radial holes of the shaft 6. On the side of the entrance to the axial channel 7 of the shaft 6, an inlet valve 10 is installed, and on the outlet side, an outlet valve 11 is installed. Valve seats 10 and 11 are made in the form of a sleeve with conical grooves for locking elements 12. Radial holes 13 are made in the conical grooves for fluid passage, and the shut-off elements 12 are made in the form of elastic rings. At one end, the plungers 8 are equipped with rollers 14, which create a reciprocating movement of the plungers 8 in the cylinders 9 by rolling over the inner surface of the cam sleeve 5 when the shaft 6 rotates. At the other end, the plungers 8 are equipped with wipers (not shown).

The pumping unit works as follows: when turning the shaft 6, as shown in Fig. 6 and FIG. 7, the plungers 8 under the action of centrifugal force are pulled out of the cylinders 9. In this case, a vacuum is created in the channel 7 (see Fig. 2 and Fig. 3) and the pumped liquid (shown by arrows) from the gas separator 2 (inlet module) enters the channel 7 through holes 13 in the valve sleeve 10, pressing the locking elements 12 away from the tapered bores. With further rotation of the shaft 6, as shown in FIG. 4 and FIG. 5, under the action of the cam sleeve 5, the plungers 8 are pushed into the cylinders 9 and displace the pumped liquid (shown by arrows) from them through the channel 7 (see Fig. 2 and Fig. 3) and through the holes 13 in the bushing of the outlet valve 11, pressing the locking elements 12 from the tapered grooves. Further, the liquid enters the tubing (not shown). With further rotation of the shaft 6, the cycle is repeated. It is known that the efficiency of plunger pumps is much higher than that of all other types of pumps. It follows from this that the proposed pumping unit solves the set task - increasing the energy efficiency of oil production.

Thus, the invention makes it possible to obtain a technical result, expressed in increasing the energy efficiency of downhole pumping units.

Claims (2)

1. A downhole pumping unit containing a pump, an inlet module, a gas separator and an electric motor with hydraulic protection, characterized in that the pump is radial-plunger, and the axial channel of its shaft is made through, and from one end of the shaft, liquid enters the channel through the inlet valve, and the other leaves it through the outlet valve. 2. The downhole pumping unit according to claim 1 differs in that the valve seats are made in the form of a sleeve with conical grooves for shut-off elements, and in the conical grooves there are radial holes for fluid passage, and the shut-off elements are made in the form of elastic rings.

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