SU1548517A2 - Deep-well sucker-rod pumping unit - Google Patents

Abstract

The invention makes it possible to increase the operational reliability of a downhole pumping unit when extracting viscous structure-forming oils due to the non-impacting starting mode. The drive 1 is connected to the sucker-rod pump 2. The cylinder 3 of the pump 2 with the suction valve 4 placed in it 4 is connected to the column (K) of 5 pump tubes. A hollow plunger 6 is located in the cavity of a cylinder 3 with a discharge valve 7 installed in it. Plunger 6 is connected to 8 pump rods, the drive 1 is connected via cable suspension 9. A working pair cylinder 10 is a non-return piston 11 mounted between suspension 9 and K 8. Cylinder 10 is associated with suspension 9, and its over piston and sub piston cavities 12 and 13 are filled with non-freezing liquid. The piston 11 is connected to K 8 and is mounted for reciprocating movement. The cavity 12, 13 is communicated by means of pipelines 14, 15 of hydraulic communication with adjustable check valves 16, 17 installed therein. The piston rod 18 of the piston 11 is sealed at the bottom of the cylinder 10 and the upper part K 5 by means of glands 19, 20. Between the glands 19, 20 spring shock absorber is installed 21. 1 cp f-ly, 1 ill.

Description

The invention relates to a technique for oil production, in particular, to well pumping sucker-rod installations, and can be used in the oil industry when pumping out viscous structure-forming oils from a well, for example, in permafrost conditions. f

The purpose of the invention is to increase the operational reliability in the production of viscous structure-forming oils due to the unstressed starting mode.

The drawing schematically shows a well pumping unit, general view Q

The well pumping unit includes a drive 1, a pump 2 connected to the drive 1, the cylinder 3 of which with the suction valve b placed therein b is connected with the column 5 of the pump tubes, and the hollow plunger 6 located in the cavity of the cylinder 3 with the discharge valve installed in it 7 - with column 8

pump rods through the cable suspension 9. The installation is additionally equipped with a working pair installed between the cable suspension 9 and the column 8 of the pump rods, a cylinder 10 — an empty piston 11, the cylinder 10 of which is connected to the cable suspension 9 and its piston 12 and piston 13 of the cavity filled with non-freezing liquid, and the non-through piston 11 is connected to the column 8 of the pump rods and is mounted with the possibility of reciprocating movement, the over piston 12 and the piston 13 of the cylinder 10 of the additional working pair are reported COROLLARY pipes 14 and 15, fluid communication with installed adjustable check valves respectively

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five

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five

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five

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16 and 17, with the rod 18 of the non-through piston 11 of the additional working pair sealed in the lower part of its cylinder 10 and the upper part of the column 5 of the pumping tubes by means of glands 19 and 20. Between the seals 19 and 20 of the rod 18 of the non-return piston 11 the additional working pair is installed spring-loaded shock absorber 21. Adjustable check valves 16 and 17 are spring-loaded and equipped with adjustment screws, respectively 22 and 23

Preparing the installation for operation consists in setting the check valves 16 and 17 by means of adjusting screws 22 and 23. When setting up the valves, it should be noted that the pressure in the piston cavity 13 should not significantly exceed the pressure from the normal maximum load, the check valve 16 should open under the action of pressure exceeding the pressure under the non-return piston 11 during normal operation of the installation, and the check valve 17 must open under the action of the pressure generated by the weight of the cable suspension 9, cylinder 10, pipes wires 15 and AND and a nonfreezing liquid filling the cylinder.

The installation works as follows.

After switching on the installation, the balance wheel (not designated) of the drive 1 transfers the cylinder 10 of the additional working pair back and forth, while periodically hydraulic forces occur inside the cylinder 10 transmitted to the no-load piston 11. The check valves 16 and 17 are activated when pumping the thickened oil after just a well (not indicated). Check valve 16 open-. rummages at increasing maximum

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load, a check valve 17 when hanging up the column of the pump rods 8. This reduces the stroke length of the rod pump 2, and the pumping speed decreases in proportion to this. During the course of the string 8 of the pump rods, the cylinder 10 moves independently with respect to the column of the pump rods under its own weight, due to which the suspension of the cable suspension 9 is prevented.

The cylinder 10 and the non-return piston 11 of the additional working pair move simultaneously in the same direction in the event that the installation goes to the specified mode, i.e. when, under the action of pressure in the piston cavity 13 of the cylinder 10, the check valve 16 does not open. At the same time, the column 8 of the pump rods (during upward movement) rises due to the pressure in the piston cavity. The check valve 17 is also closed during normal installation operation (without suspension of the rod 8 of the pump rods). The spring (not indicated) acts as a shock absorber 21 when the cable suspension 9 is broken and prevents the cylinder 10 from collapsing. As the structure of the oil in the column 5 of the pump tube collapses and its viscosity decreases, the specified stroke length is restored by reducing the pressure in the cylinder columns of pump rods.

Claims (2)

Claim 1. Borehole sucker-rod pumping unit, comprising a drive, a sucker-rod driven pump, qi Jq Q 5 0 5 o five the linder of which, with the suction valve placed in it, is connected with the column of pump tubes, and the hollow plunger located in the cavity of the cylinder with the discharge valve installed therein is connected with the column of pump rods, the drive is connected with the column of pump rods through a cable suspension, characterized in that , in order to increase the operational reliability during the extraction of viscous structure-forming oils due to the impact-free start-up mode, it is additionally equipped with suspension and column of pump rods i the working pair is a cylinder — a non-through piston, the cylinder of which is associated with the cable suspension and its over piston and sub piston cavity are filled with antifreeze fluid, and the non return piston is connected with the column of pump rods and is installed with reciprocating movement, extra piston and sub piston cavity of the additional working pair communicated by means of hydraulic communication pipelines with adjustable check valves installed in them, the non-through piston rod of the additional operating par The tubes are sealed at the bottom of its cylinder and at the top of the tubing string by means of glands. 2. Installation according to claim 1, characterized in that a spring damper is installed between the seals of the rod of the non-through piston of the additional working pair. Compiled by E.Ginzburg Editor A.Shandor Tehred A.Kravchuk Proofreader N.Pojo Order 128 Circulation 97  VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Subscription