RU55893U1 - WELL PUMP INPUT - Google Patents

Abstract

The utility model relates to the oil industry and can be used in the production of flooded oil to reduce the rate of formation of a highly viscous water-oil emulsion in a column of elevator pipes by organizing the alternate supply of oil and water to a well pump.

In the input device of the downhole pump, comprising a settling chamber connected to the sub of the receiving part of the downhole pump, in which a U-shaped supply channel is placed, one end of which is led out to the settling chamber. A hole cup is located below the settling chamber, which is connected to the settling chamber by an inlet channel, the cross section of which is smaller than the passage section of the settling chamber, the lower end of the inlet channel being located below the opening of the cup, and the upper end in the settling chamber. The settling chamber and the cup are located in a single housing, where they are separated by a jumper, and the U-shaped supply channel and the inlet channel are formed by the longitudinal partitions of the housing, the upper end of the input channel being at the level of the end of the U-shaped supply channel discharged behind the settling chamber.

The application of the proposed input device will allow: to reduce the cost and complexity of manufacturing the device due to the exclusion of welded operations, reduce its metal consumption by more than 90% and increase durability through the use of polymer materials, as well as increase the throughput of the device by changing the geometry of its channel cross sections.

Description

The utility model relates to the oil industry and can be used in the production of flooded oil to reduce the rate of formation of a highly viscous water-oil emulsion in a column of elevator pipes by organizing the alternate supply of oil and water to receive a well pump.

The well-known "Input device of a borehole pump" (RF patent No. 2213269, class F 04 D 13/10, publ. Bull. No. 27 of 09/27/2003), including a U-shaped inlet pipe, sub of the receiving part of the borehole pump, slop a chamber having an inlet channel in the lower part and an additional settling chamber located on the U-shaped inlet pipe at the place of changing the direction of fluid flow, and the channel sections of the U-shaped inlet pipe are made circular and formed by tubes eccentrically placed one on top of the other.

The disadvantages of the device are the high complexity and cost of its manufacture, since when welding the caps to the outer pipe, it is necessary to ensure their sufficiently high alignment, which can be achieved only by using special devices, high metal consumption of the device, since all parts and assemblies used are made of metal, and low durability work due to corrosion of thin-walled metal pipes of the device in the well.

It is known "Input device of a borehole pump" (RF patent No. 2232294, class F 04 B 47/00, publ. Bull. No. 19 dated 07/10/2004), containing a settling chamber connected to the sub of the receiving part of the well pump, in which partially a U-shaped inlet pipe is placed, one end of which is led out to the settling chamber, and the settling chamber has an inlet channel in the lower part with a section smaller than the passage section of the settling chamber. The input device is additionally equipped with a glass,

an inlet channel made with holes in the upper part and communicated with the settling chamber, made in the form of a tube placed in the cup, the lower end of which is located below the cup openings, and the upper end is located in the settling chamber at some distance from its bottom.

The disadvantages of the device are also the high complexity of its manufacture and high metal consumption, as well as low throughput of the annular channels.

The technical task of the utility model is to reduce the cost and complexity of manufacturing the device by eliminating weld operations, reduce its metal consumption and increase durability through the use of polymeric materials, as well as increase the throughput of the device by changing the geometry of the sections of its channels.

The specified technical problem is solved by the input device of the borehole pump containing a settling chamber connected to the sub of the receiving part of the borehole pump, in which a U-shaped supply channel is placed, one end of which is led out to the settling chamber, and a glass with holes is located below the settling chamber, which is connected to the settling chamber the camera inlet channel with a cross section smaller than the passage section of the settling chamber, while the lower end of the inlet channel is located below the holes of the glass, and the upper end is in the settling chamber at the same time, the internal cross-sectional area between the inlet channel and the glass is chosen so that the maximum speed of the water flowing down in this section can exceed the rate of oil floating in the water by no more than two times, and the minimum internal space between the inlet and the glass should be at least half the volume of fluid entering the pump during suction.

What is new is that the settling chamber and the cup are located in a single housing, where they are separated by a jumper, and the U-shaped supply channel and the input channel are formed by the longitudinal partitions of the housing, with the upper end of the input channel being at the level of the end of the U-shaped supply channel slop chamber.

Figure 1 presents a diagram of the input device, figure 2 is a cross section of the device (enlarged).

The input device comprises a settling chamber 2 connected to the adapter 1 of the pump receiving part (see FIG. 1), in which a U-shaped supply channel 3 is placed. The end 4 of the U-shaped supply channel 3 is led out to the settling chamber 2. Below is located the settling chamber 2 a glass 5 with holes 6, which is connected to the settling chamber 2 by the inlet channel 7, the cross section of which is smaller than the passage section of the settling chamber 2. The lower end 8 of the inlet channel 7 is located below the holes 6 of the cup 5, and its upper end 9 is located in the settling chamber 2.

The settling chamber 2 and the cup 5 are located in a single housing 10, where they are separated by a jumper 11. The U-shaped supply channel 3 and the input channel 9 are formed by longitudinal partitions 12 (see FIG. 2) of the housing 10, and the upper end 9 (see FIG. .1) the inlet channel 7 is located at the level of the end 4 of the U-shaped inlet channel 3, brought out of the settling chamber 2.

The device operates as follows.

The reservoir fluid entering the well (not shown in FIG. 1) is divided into oil and water under the influence of gravitational forces. In the steady-state operation mode of the pumping unit, the oil-water interface is within the height of the device, since the device switches to the selection of either water through holes 6 of cup 5 or oil through a U-shaped supply pipe 3.

Since the separation of formation fluid into oil and water in the well occurs constantly, oil with a lower density floats in the water, moves up the wellbore and, when the input device is switched to water extraction, goes through the openings 6 into the glass 5 through holes 6.

The annular cross-sectional area between the inlet channel 7 and the nozzle 5 is selected in such a way that the maximum velocity of the water flowing down in this section can exceed the rate of oil floating in the water by no more than two times, while the minimum space between the inlet channel 7 and the nozzle 5 should be at least half the volume of fluid entering the pump during suction. The necessary volume is ensured by the fact that the bottom

the end 8 of the input channel 7 is located at some sufficient distance below the holes 6 of the glass 5.

This embodiment of the input device eliminates the ingress of oil into the inlet channel 7 and then into the receiving pipe 1, since the liquid flows downward in the glass 5 only when the pump is sucked in, and the oil floats up to the water constantly. Under the aforementioned condition for fulfilling the cross-sectional area between the inlet channel 7 and the glass 5, drops of oil will be able to go down only half the distance that water can move down. Then, during the discharge stroke of the plunger, when the suction valve of the pump is closed, and the water in the glass is at rest, all the oil that entered the glass 5 with water during the suction stroke of the plunger manages to float out of the glass 5 through the windows 6 into the well.

As water is taken from the well, the oil-water interface decreases, the equilibrium of the liquid columns in the U-shaped supply channel 3 and inlet channel 7 is violated and the device switches to oil selection.

Oil enters the device through the end 4 of the U-shaped supply channel 3, which is led out behind the settling chamber 2, then moves downward through the cavity 13 of the U-shaped supply channel 3, enters the settling chamber 2, then upward through the cavity 14 of the U-shaped supply channel 3 into sub 1 of the receiving part of the downhole pump and further into the pump (not shown).

The speed of movement of oil when leaving the cavity 13 is reduced, since the cross-sectional area of the settling chamber 2 is several times greater than the cross-sectional area of the cavity 13, and the direction of oil flow when it enters the cavity 14 is reversed. Due to this, the separation of mechanical impurities from oil and their subsidence on the bridge 11, which is the bottom of the settling chamber 2.

The location of the upper end 9 of the input channel 7 at the level of the end 4 of the U-shaped supply channel 3 provides the equal and maximum possible height of the liquid columns in the channels of the device, since the higher the height of the U-shaped supply channel 3, the larger the portions

water will be supplied to the pump, ceteris paribus, and thus at a higher height from the pump, the formation of a highly viscous emulsion is possible.

When producing viscous oil in cavities 13 and 14, of which the U-shaped channel 3 consists, significant hydrodynamic drags arise, which requires an increase in the throughput of their cross sections. It is impossible to increase the throughput capacity of the cavities by increasing the cross-sectional area within the limited space of the well, therefore, the cross sections of these cavities formed by the longitudinal partitions 12 (see FIG. 2) in the housing 10 during its manufacture, for example, from polyethylene using an extruder, are made prismatic . In addition, the longitudinal partitions 12 act as stiffeners, increasing the rigidity and strength of the housing 10, which simplifies the transportation and installation of the device.

As the oil is taken from the well, the liquid separation line rises, the equilibrium of the liquid columns in the U-shaped supply channel 3 and inlet channel 7 is violated and the device switches to water selection. Further cycles are repeated.

An approximate solution for laminar fluid flow in prismatic channels of arbitrary cross section with sufficient accuracy for practical calculations can be obtained by dependence (see p. 152-153. Rabinovich EZ Hydraulics. M .: Nedra, 1977. - 304 s)

where Q is the fluid flow rate;

Δp is the pressure drop along the length of the channel;

F is the cross-sectional area of the channel;

l is the channel length;

μ is the dynamic viscosity of the liquid;

I ₀ is the polar moment of inertia of the cross section of the channel in question.

Calculations carried out according to the formula show that, ceteris paribus, the fluid flow through the channels of the prismatic section, that is, their

the throughput exceeds almost 2 times the throughput of the annular sections formed by the arrangement of pipes with the maximum possible eccentricity and is almost 5 times higher than the throughput of the annular sections formed by the concentric arrangement of the pipes. This allows without increasing the transverse dimensions of the device, which is important in a limited space of the well, to significantly increase its throughput.

The application of the proposed input device will allow: to reduce the cost and complexity of manufacturing the device due to the exclusion of welded operations, reduce its metal consumption by more than 90% and increase durability through the use of polymer materials, as well as increase the throughput of the device by changing the geometry of its channel cross sections.

Claims (1)

A borehole pump inlet device comprising a settling chamber connected to a borehole receiving part sub, in which a U-shaped supply channel is disposed, one end of which is led out to the settling chamber, and a hole cup is located below the settling chamber, which is connected to the settling chamber by a cross-section inlet channel , smaller than the passage section of the settling chamber, while the lower end of the inlet channel is located below the holes of the glass, and the upper end is in the settling chamber, while the area of the inner section The interface between the inlet channel and the glass is chosen in such a way that the maximum speed of the water flowing down in this section can exceed the rate of oil floating in the water by no more than two times, and the minimum amount of internal space between the inlet channel and the glass should be at least half the volume of liquid flowing into the pump during suction, characterized in that the settling chamber and the glass are located in a single housing, where they are separated by a jumper, and the U-shaped supply channel and the inlet channel are formed by longitudinal partitions in inside the housing, the upper end of the input channel being located at the level of the end of the U-shaped inlet channel, led beyond the settling chamber.