RU2233995C1 - Deep-well sucker-rod pump - Google Patents

Abstract

FIELD: oil producing industry.

SUBSTANCE: device is designed for use in well sucker-rod pumping units, namely, in movable plunger with single delivery valve of deep-well sucker-rod pump. Central hole for lower end of rod-like pusher is made in valve ball travel upper stop. Pusher is installed coaxially with movable plunger for interaction with valve ball within the limits of working stroke and getting of upper end of rod-like pusher beyond the limits of movable plunger.

EFFECT: possibility of production of high-viscosity oil with higher content of paraffin from inclined wells of high capacity, improved reliability of pump.

2 dwg

Description

The invention relates to the oil industry and can be used in borehole sucker rod pumping units (SSHNU), namely in a movable plunger with a single discharge valve of a deep sucker rod pump.

Deep sucker rod pumps (OAO Izhneftemash, Deep sucker rod pumps, Catalog, rev. 2-2001) contain a movable plunger located in a fixed cylinder. At the lower end of the movable plunger there is a discharge valve in the classic version (page 32, ibid.), Including a valve body 5, a valve ball 7, a valve seat 6, a seat holder 8. The stroke of the valve ball 7 from the upper side is regulated by the upper valve stop, provided with channels for the passage of fluid.

In the process of pump operation in highly viscous production, with a high content of oil paraffin and also from deviated wells, difficulties arise with timely closing and opening of valves, including the discharge valve, which leads to a decrease in pump performance, and in some cases to forced well shutdown. The paraffinized discharge valve freezes and refuses to work, especially as a result of forced downtime of the well or due to the ingress of solid fraction into the valve assembly, which is the result, again, of the delayed closing of the injection valve. In such cases, it is necessary to reanimate the wells by flushing the downhole pumping equipment, combining flushing with its operation in forced mode, which does not in all cases give a positive result. Then the well undergoes an underground repair, associated with high costs.

The objective of the proposed technical solution is to increase the reliability of the deep-well pump.

To achieve this goal, it is necessary to make a central hole in the upper limiter of the valve ball stroke for the lower end of the rod-shaped pusher, mounted coaxially with the movable plunger with the possibility of interaction with the ball of the valve within its working stroke and exit the upper end of the rod-shaped pusher outside the movable plunger.

Figure 1 shows a longitudinal section of the proposed pump on the basis of, for example, a tube pump with a non-removable suction valve (OAO "Izhneftemash", Deep rod pumps, Catalog, rev. 2-2001, p. 34); figure 2 - remote section in figure 1.

The deep rod pump consists of a stationary cylinder 1 (Fig. 1) connected to the housing 2 of the suction valve 3 by means of couplings 4 and an extension 5. The movable plunger 6 located in the stationary cylinder 1 is equipped with a single discharge valve consisting of a housing 7 with a valve cavity 8, upper limiter valve 9 with channels 10 for the passage of fluid. In the valve cavity 8 is located the ball of the valve 11 with the possibility of "free floating" within its working stroke. The ball of the valve 11 is located on the seat 12, fixed by means of the holder of the seat 13.

A central hole is made in the upper stroke limiter of valve 9, in which a rod-shaped pusher 14 is provided coaxially with the movable plunger 6, provided with a restrictive shoulder 15 at the lower end, and centralizers 16 in the area located above the upper stroke limiter of valve 9 (Fig. 1, 2), the number of which depends on the length and cross section of the rod-shaped pusher 14. In this case, the rod-shaped pusher 14 is located in the movable plunger 6 with the possibility of interaction of its lower limiting flange 15 with the ball 11 valve within its working stroke. This means that the rod-shaped pusher 14, being in the movable plunger 6 of the tube whether or the insert pump, has the possibility of axial reciprocating movement within the stroke of the ball 11 of the discharge valve. As for the length of the latter, it, for example, is practically unlimited for tube pumps, since the said pusher 14 can be located at a level above the movable plunger 6, where there is more space both in diameter and in height. To do this, it is necessary to extend the movable plunger by the required value by means of a hollow core or by connecting the plunger to each other with their couplings (OAO Izhneftemash, Deep Rod Pumps. Catalog, rev.2-2001, p. 51), in addition to all of the above, followed by the transition from the plunger to the corresponding, for example, tubing with radial holes (not shown) for the passage of fluid and connect this pipe to the string of pump rods (not shown). With this arrangement, there will be an exit of the upper end of the rod-shaped pusher 14 beyond the boundaries of the movable plunger 6, which allows a wide choice with respect to the mass of the pusher 14.

Figure 1 shows the moment the start of movement of the movable plunger 6 up. In this case, the ball 11 of the discharge valve is closed under the action, first of all, of the rod-shaped pusher 14. In addition, a column of liquid above the movable plunger 6 acts on the discharge valve. A vacuum is created in the subplunger cavity, as a result of which the suction valve 3 opens. The liquid in the superplunger the cavity passes into the tubing string, and the subplunger cavity is filled with the produced fluid.

When the movable plunger 6 moves down, the suction valve 3 closes under the pressure of the liquid in the subplunger cavity. The movable plunger 6 together with the column of pump rods under the influence of gravity of the Earth falls down. There comes a time when sufficient pressure is created in the sub-plunger cavity to open the ball of valve 11 together with the rod-shaped pusher 14. In practice, with a functioning suction valve 3, the pressure valve 2 opens immediately, because the fluid is incompressible.

And the peculiarity is that in this case, a large force is required to open the discharge valve 11, caused by the presence of the pusher 14, this is not reflected in any way on the pump efficiency (efficiency), since this uses the force of gravity.

The movable plunger 6 with a pressure valve, reconstructed in this way, can be used in deep rod pumps of various layouts, including in combination with a device for oil production and treatment of the bottomhole zone of the well (patent 1794312, 02/07/1990), where there is no suction valve , and there is, if you call it generally, a suction channel (a hole in a fixed cylinder), with a deep-well sucker-rod pump (patent 2165010, 04/10/2001, bull. No. 10), where the suction valve is located on the side.

The proposed deep-well sucker-rod pump with a forced-closing discharge valve provides the production of highly viscous oil, oil with a high content of paraffin, and from deviated wells, with a performance characteristic of pumps of a similar type.

Claims (1)

Deep sucker rod pump, consisting of a fixed cylinder with a suction channel, located in a fixed cylinder of a movable plunger with a single discharge valve, comprising a housing with a valve cavity, a valve ball located in the housing, a valve seat, a seat holder and an upper limiter of the valve ball running in the housing, equipped with channels for the passage of fluid, characterized in that in the upper limiter of the valve ball stroke there is a central hole for the lower end of the rod-shaped push ator mounted coaxially movable with the plunger to engage the ball valve within its working stroke and exit the upper end of the rod of the pusher beyond the movable plunger.

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