SU1236161A1 - Well sucker-rod pump installation - Google Patents

Description

The invention relates to a technique for the extraction of oil, in particular to well sucker-rod pumping units, and can be used in the oil industry to prevent the formation of a highly viscous emulsion in the well.

The purpose of the invention is to increase the reliability of the installation by reducing the resistance to movement of the plunger.

Figure 1 shows a schematic representation of a downhole pumping unit during the course of a rod string down, sheath, view; figure 2 - the same, with the course of the column rods up.

The well pumping unit comprises a well pumping pump 1, in case 2 of which cylinder 3 is installed with a suction valve 4 connected to the column of pumping pipes 5 and plunger 6 placed in cylinder 3 with a pressure valve 7 connected to the valve of hollow rods 8. The cylinder 3, together with the housing 2, has a shank 10 lowered to the bottom of the well 9 with an additional suction valve 11 located in its upper part. The installation also contains an additional discharge valve 12. The housing 2 is located in the pump column pipes 5 with the formation of an annular axial channel 13 for entering the water phase through the side channel 14 in the upper part of the cylinder 3 into the space above the plunger 6. The additional discharge valve 12 is made cup-like and freely mounted on a column of hollow rods 8, and the body 2 is provided with a channel 15, connecting the lower part of the cylinder 3 of the pump 1 with the annulus of the well 9. The column of hollow rods 8 is fixed with its upper part to the polished rod 16 connected to the drive (not shown) of the installation.

A borehole sucker pump unit operates as follows.

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five

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five

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Emerging from the formation well; 9, the water-cut is delaminated in oil and water. Oil due to its lower density accumulates in the upper part of the liquid column in the well, and water in the lower part.

During the operation of the installation, when the columns of the 8 lower rods move downwards (Fig. 1), oil passes through the discharge valve 7 into the internal cavities of the plunger 6 and ptangas 8 and then through the opening in the upper part of the hollow column itang 8 flows directly into the pump 5 near the wellhead 9. At the same time, the suction valve 4 remains closed. Owing to the increasing volume of the supra-plunger cavity of the cylinder 3 of the pump 1, the water part of the well production through the shank: 10 and the opener) additional: 1 positive suction valve 11 enters the annular axial channel 13 between the cylinder 3 and the housing 2 of the pump 1 and then through the side channel 14 in the upper part of the cylinder 3 gets into the above plunger; 1 cylinder of the pump. The additional injection disc valve 12 remains closed during this period due to the pressure drop acting on it from above.

When the boom moves upwards (Fig. 2), water from the pre-plunger cavity of the cylinder 3 and the annular axial channel 13 through the opened additional injection disk valve 12 is pumped out into the cavity of the pump tubes 5. The additional suction valve 11 remains closed at this time. Oil due to the closing of the discharge valve 7 through the channel 15 in the housing 2 and the suction valve 4 enters the sub plunger cavity of the cylinder 3 between the plunger 6. And the valve 4.

Due to the different levels of oil and water extraction, as well as the separation of vertical reservoir fluid flows, a warning of oil emulsion in the area from pump 1 to wellhead 9 is achieved,

Claims (1)

A downhole sucker-rod pump installation for preventing the formation of a persistent, highly viscous emulsion in a well, comprising a sucker-rod suction pump, in which a cylinder with a suction valve is installed, connected to a pump pipe string, a plunger with a discharge valve located in the cylinder and connected to the hollow rod string, the cylinder together with the body has a liner down to the bottom of the well with an additional suction valve located in its upper part, as well as an additional discharge valve a pan, characterized in that, in order to increase reliability by reducing the resistance to movement of the plunger, the housing is located in the column of pump pipes with the formation of an annular axial channel for the aqueous phase to enter the space above the plunger, and an additional discharge valve is made poppet and freely mounted on the column of hollow rods moreover, the housing is provided with a channel connecting the lower part of the pump cylinder with the annular space of the well. <g y <35 <35 Fig 1