RU37533U1 - CENTRIFUGAL WELL PUMP STEP (OPTIONS) - Google Patents

Description

Centrifugal pump stage

The utility model relates to petroleum engineering and can be used in multistage centrifugal well pumps for pumping formation fluid.

Known stages of a centrifugal borehole pump (US Pat. RU No. 2209345, IPC F04D13 / 10, publ. 2003, IP. RU No. 2209347, IPC F04D13 / 10, publ. 2003, US Pat. No. 2196235, IPC F04D13 / 10, publ. 2003)., Containing a guide apparatus in which grinding of solid inclusions is installed.

Closest to the claimed options and adopted as a prototype is a centrifugal borehole pump stage (US Pat. RU No. 2196235, IPC F04D13 / 10, publ. 2003), in which the grinding unit for solid inclusions is formed by moving and stationary elements relative to the guide apparatus.

In this stage, when pumping out, the formation fluid along the inlet channel formed by the grooves of the guide vane passes into the gap between the guide vane and the impeller blades to the grinding unit for solid inclusions, which leads to clogging of the inlet channel, the impeller and the accumulation of solid inclusions in the grooves of the guide vane and in the passageways between the impeller blades, and, consequently, reduce the resource and performance of the pump, as well as the need for frequent cleaning of its stages.

The objective of the utility model is to increase the productivity of the pump and ensure its reliable operation due to reliable grinding of solid inclusions.

IPC R04V13 / 10 (options)

inclusions formed by moving and stationary relative to the guide apparatus elements.

This improvement lies in the fact that the fixed element is made in the form of a circular knife forming a cutting pair with a movable element made in the form of a knife with radial cutting edges and guide surfaces, and the input channel is made in the form of longitudinal passage openings in the fixed element.

In addition, the grinding unit for solid inclusions can be made in the form of two fixed disk knives with longitudinal passage channels, between which a movable knife with radial cutting edges and guide surfaces is installed.

In addition, on the guide surfaces of the movable knife in the peripheral part can be made of izobraznye samples that go to the end surfaces of the knife.

The implementation of a fixed element in the form of a circular knife, forming a cutting pair with a movable element made in the form of a knife with radial cutting edges and guide surfaces, allows you to reliably grind solid inclusions formed by cutting pair. At the same time, the guiding surfaces of the movable knife provide the movement of the reservoir fluid with increased pressure, which increases the performance of the pump with such components.

The implementation of the inlet channel in the form of longitudinal apertures in the fixed element ensures the flow of formation fluid directly directly to the grinding unit for solid inclusions, eliminating clogging of the pump stages.

The implementation of the grinding unit for solid inclusions in the form of two stationary disk knives with longitudinal passage channels between which a movable knife with radial cutting edges and guide surfaces is installed provides enhanced effects of grinding of solid inclusions and increasing the pressure of the supplied reservoir fluid due to the piston effect created by the movable knife rotating between fixed knives adjacent to its end surfaces.

Performing on the guide surfaces of the movable knife in the peripheral part of the U-shaped samples facing the end surfaces of the knife provides reliable grinding of solid inclusions by eliminating them falling into the gap between the guide apparatus and the side surface of the movable knife.

The invention is illustrated in the drawing, where in FIG. 1 shows the proposed stage of a borehole pump with two fixed knives, FIG. 2 is a section AA in FIG. 1.

The centrifugal well pump stage comprises a guiding apparatus 1 made in the FIG. 1 embodiment as a whole with a fixed knife 2 in which a solid grinding unit is installed on the shaft 3, made in the above embodiment as a cutting pair formed by a movable element - a knife 4, located between the stationary elements - knives 2. The gap between the knives 4 and 2 does not exceed 0.2mm. The movable knife 4 has in the above embodiment four radial cutting edges 5 and guide surfaces, and in the stationary knife 2 there are longitudinal passage openings 6 forming the input channel of the step. The movable knife 4 is installed with a gap between its peripheral part and the inner surface of the guide apparatus 1 of 0.15 mm. On the guide surfaces of the movable knife 4 in the peripheral part, U-shaped samples 7 are made that extend to the end surfaces of the knife 4.

The proposed stage is installed as the first stage of a centrifugal borehole pump. The number of such steps in the pump is determined by the saturation of the reservoir fluid with gas and its fluidity M 3/3 3 (6 3.

solid inclusions. Assembly of a centrifugal pump consisting of only such stages is possible.

Formation fluid under pressure through the inlet channel - openings 6 immediately directly enters the grinding unit for solid inclusions - between the fixed knife 2 and the movable knife 4, which chop the solid inclusions with cutting edges, while the guiding surfaces of the movable knife 4, rotating at a speed of the order of min move formation fluid. Due to the piston effect created by the movable yogi 4, rotating between the fixed knives 2 adjacent to its end surfaces, the pressure of the supplied liquid is increased. It is significantly reduced

the release of free gas from the supplied reservoir fluid and because of this increases the performance of the pump.

When the formation fluid moves along the guide surface, solid inclusions fall into the i-shaped samples 7, which exit onto the end surfaces of the knife 4, where they are reliably crushed and prevent large fractions of solid inclusions from falling into the gap between the guide apparatus 1 and the side surface of the movable knife 4. This prevents overlapping by solid inclusions of passage channels of guide vanes and impellers of subsequent stages (when installing the proposed device as first stage of the price of a phobic well pump).

Thus, the use of the proposed centrifugal pump stage increases its productivity increases the resource and reliability of its operation due to reliable grinding of solid inclusions and elimination of clogging of the pump stages, and as a result, reduces the number of expensive lifts of underground equipment, disassembly and cleaning.

Claims (4)

1. The step of a centrifugal borehole pump containing an inlet channel and a guide apparatus, in which there is mounted a grinding unit for solid inclusions formed by movable and stationary elements relative to the guide apparatus, characterized in that the fixed element is made in the form of a circular knife forming a cutting pair with a movable an element made in the form of a knife with radial cutting edges and guide surfaces, and the inlet channel is made in the form of longitudinal passage holes in the fixed element . 2. The step according to claim 1, characterized in that on the guide surfaces of the movable knife in the peripheral part are made

-shaped samples facing the end surfaces of the knife. 3. The step of a centrifugal borehole pump containing an inlet channel and a guide apparatus, in which there is mounted a grinding unit for solid inclusions formed by movable and stationary elements relative to the guiding device, characterized in that the grinding unit for solid inclusions is made in the form of two fixed circular knives with longitudinal passage channels between which a movable knife with radial cutting edges and guide surfaces is mounted to form cutting pairs, and the input channel is made He in the form of longitudinal passage openings in a fixed element. 4. The step according to claim 3, characterized in that on the guide surfaces of the movable knife in the peripheral part are made

-shaped samples facing the end surfaces of the knife.