RU92916U1 - HOSE PUMP FOR HIGH VISCOUS OIL PRODUCTION - Google Patents

Abstract

 A sucker rod pump for the production of highly viscous oil, comprising a cylinder that is lowered onto a pipe string, a normally closed suction valve pressed to the saddle, a plunger, a discharge valve stem interacting with the plunger and rigidly connected to the rod string with the possibility of limited axial movement in the plunger, characterized in that that a centering column of rods is installed above the cylinder through passage, around the centering holes of which longitudinal transfer channels are made, while the pipe string is higher than the centering sleeve os aschena radial drainage channel, which is hermetically closed valve whipped egg-white.

Description

The proposal relates to the oil industry for the production of high viscosity oil.

The well-known "sucker-rod pump with controlled valves for the production of highly viscous oil" (patent RU No. 2211374, F04B 47/00, publ. Bull. No. 24 from 08/27/03), containing a cylinder, a suction valve, a plunger, a discharge valve valve with a pusher, while the cylinder, spring-loaded from above, is provided with a centering device and is capable of axial movement inside the casing, which is rigidly connected to the pipe string, while the suction valve consists of a cylinder seat and a shut-off element with a passage channel of the casing, between the cylinder and the casing tired occurrence of a seal assembly.

The disadvantages of this device are the complexity of manufacturing, design complexity, metal consumption, reduced stroke associated with moving the cylinder, as well as the inability to use parts of a standard sucker rod pump during its manufacture, while the entire pump fails when the suction valve-valve fails.

The closest in technical essence and the achieved result is a "sucker rod pump for the production of highly viscous oil" (patent RU No. 55892, F04B 47/00, publ. Bull. No. 24 from 08/27/2006), containing a cylinder, a suction valve with a seat, a plunger, a discharge valve-valve with a pusher interacting with the plunger, while the suction valve is made normally closed and pushed to the seat, and the valve stem is rigidly connected to the rod string through the pusher, which is installed in the plunger with the possibility of limited axial movement ..

The disadvantages of this device are:

- increased wear of the rubbing pair — plunger — cylinder, since the wellbore is not absolutely even, which causes the plunger to skew relative to the cylinder;

- spilling liquid at the wellhead when lifting the pump from the well, since it is not possible to use thrown bushings to open the drain channels. The technical task of the proposed utility model is to increase the pump life due to the additional centering of the plunger to eliminate skew relative to the cylinder, as well as to improve the working conditions of the service crews by eliminating the outflow of well fluid at the mouth when the pump is raised to the surface.

The technical problem is solved by a rod pump for the production of highly viscous oil, containing a cylinder that is lowered on a pipe string, a normally closed suction valve pressed to the saddle, a plunger, a pressure valve stem interacting with the plunger and rigidly connected to the rod string with the possibility of limited axial movement in the plunger.

What is new is that a centering column of rods is installed above the cylinder, a passage sleeve around which center longitudinal holes are made around the centering hole, while the pipe string above the centering sleeve is equipped with a radial drain channel, which is hermetically closed by a relief valve.

Figure 1 schematically shows the lower part of the sucker rod pump with a plunger in longitudinal section.

Figure 2 shows a section aa of the plunger pump.

Figure 3 shows a section bB of the plunger pump.

A sucker rod pump for producing highly viscous oil contains a cylinder 1 (Fig. 1), lowered on a pipe string 2, normally closed by a spring 3 pressed into the seat 4 by a suction valve 5, a plunger 6, a discharge valve-valve 7, which interacts with the plunger 6 and is rigidly connected to rod string 8 with the possibility of limited axial movement in the plunger 6. Above the cylinder 1, a centering rod column 8 is installed through passage 9, around the centering holes 10 of which longitudinal duct channels 11 are made. The pipe string 2 above the centering sleeve 9 os is equipped with a radial drain channel 12, which is hermetically closed by a relief valve 13.

Moreover, in practice, for the manufacture of a sucker rod pump, cylinder 1 and plunger 6 from a standard sucker rod pump were used. At the same time, cylinder 1 was equipped with a preloaded spring 3 to the seat 4 with a suction valve 5 that overlaps the passage hole 14. The plunger 6 was shortened (a sufficiently shortened plunger 6 was used to produce highly viscous oil), the internal cavity was machined and equipped with a valve stem 7 with a stop 15 connected rigidly to rod string 8. Moreover, the stop 15 (figure 2) is made in the form of radial plates arranged uniformly around the circumference relative to the valve stem 5 and centering it in the plunger 6.

The sucker rod pump operates as follows.

The sucker rod pump is connected by a cylinder 1 (Fig. 1) to the pipe string 2 (for example, by means of a coupling 16), at which it is lowered to a predetermined depth into the well (not shown in Fig. 1) and reciprocating movements are reported to the boom string 8 (Fig. .one).

When moving up the column of rods 8, the rod-valve 7 is in a closed state, interacting with the plunger 6, which moves upward relative to the cylinder 1. The vacuum under the plunger 6, opens the bore 14 of the valve 5 overcoming the resistance of the spring 3, and draws the well production into the cylinder 1 along the side channels 117 (Fig. 3) of the housing 1. At the same time, the production of the well located in the cylinder 1 above the plunger 6 (Fig. 1) rises to the wellhead (not shown in Fig. 1) of the well, where it is taken into pipelines or tanks .

When moving the column of the rods 8 down, the stop 15, interacting with the plunger 6, moves it down relative to the cylinder 1. In this case, the rod-valve 7 is in the open state, and the suction valve 5 is in the closed state, that is, the suction valve 5 is tightly pressed by the spring 3 to the saddle 4, despite the viscosity of the produced oil and the inclination of the cylinder 1 relative to the vertical. Well production (high viscosity oil) from under the plunger cavity of cylinder 1 (FIG. 1) through channels 18 (FIG. 2) located between the stop plates 15 flows into the supraplunger cavity (FIG. 1).

Repeating cycles of reciprocating movements of the column of rods 8 allows for the constant selection of highly viscous oil.

In the manufacture of the total cross-sections of the side channels 17 (figure 3) of the housing 1, channels 18 (figure 2) in the plunger 6 and pretreatment channels 11 (figure 1) of the centering sleeve 9 are approximately equal to exclude increased hydraulic resistance. Due to the presence of the centering sleeve 9 (installed rigidly, for example, between the cylinder 1 and the pipe string 2) with the hole 10 under the rod string 8, they are additionally fixed from radial deviations, which eliminates the distortions of the cylinder 1 and plunger 6 between themselves and, as a result , increase the pump life from practice by 15%.

If necessary, removing the pump (for repair or routine maintenance) from the well, into the pipe string 2 between the pipe walls 2 and the rod string 8, a weighted sleeve is dropped (not shown in FIG. 1), which destroys the relief valve 13, which leads to hydraulic connection of the spaces inside the pipe string 2 and outside through the drain channel 12 and allows to merge when lifting liquid from the pipe string 12, excluding its spout at the mouth. In this case, the centering sleeve 9 restricts the movement of the weighted sleeve further down, which also protects the cylinder 1 and the plunger 6 from shock loads and, as a consequence, from breakdowns.

Using the proposed sucker rod pump allows increasing the pump life due to the additional centering of the plunger to avoid skew relative to the cylinder, as well as improving the working conditions of service crews by eliminating the outflow of well fluid at the mouth when lifting the pump to the surface.

Claims (1)

A sucker rod pump for the production of highly viscous oil, comprising a cylinder, lowered onto a pipe string, a normally closed suction valve pressed to the saddle, a plunger, a discharge valve stem interacting with the plunger and rigidly connected to the rod string with the possibility of limited axial movement in the plunger, characterized in that a centering column of rods is installed above the cylinder, a bushing, around the centering holes of which longitudinal transfer channels are made, while the pipe string is higher than the centering sleeve aschena radial drainage channel, which is hermetically closed valve whipped egg-white.