SU1028886A1 - Device for lifting liquid out of bore-hole - Google Patents

Abstract

A WELLING LIQUID DEVICE, containing a column of lifting pipes, a cylinder with a hollow plunger placed in it, made with inverse-pressure valve and a safety valve and kinematically connected with a drive located at the mouth of a well, characterized by the fact that, in order to keep it safe, , it is fitted with an additional cylinder under the plunger with a spring-loaded piston with a stem and sliding bolsters, which are kinematically connected with the latter and arranged with the possibility of interaction. with the pipe, with one of the cavities of the additional cylinder communicated with the cavity of the plunger, a friend - with the sub-plunger space.

Description

ABOUT

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The invention relates to a technique for oil recovery, in particular, devices for lifting small amounts of fluid from wells at low reservoir pressure, and can be used in the oil and gas industry.

A device for lifting fluid from wells is known, comprising a column of risers, a cylinder with a hollow plunger placed in it, provided with check and safety valves and kinematically connected with a drive located at the wellhead l.

A disadvantage of the known construction of the device is the possibility of emergency situations associated with the breakthrough of the gas from the reservoir under the influence of fluid, which in turn can lead to a rapid lifting of the plunger, hitting it against the mouth gland and entangling the flexible traction element of the drive. This reduces the reliability of the device in operation.

The purpose of the invention is to increase the reliability of the device.

This goal is achieved by the fact that a device for lifting fluid from wells, containing a column of lifting pipes, a cylinder with a hollow plunger in it, made with a backflow valve and a safety valve and kinematically connected with. the actuator located at the wellhead is equipped with an additional cylinder mounted under the plunger with a spring-loaded piston with a rod and sliding shawls kinematically associated with the latter and arranged to interact with the casing, one of the cylinder cavities communicating with the plunger cavity, friend - with the sub-plunger space.

The drawing shows schematically a device for lifting fluid from wells, a general view.

The described device for lifting fluid from the wells comprises a column of lifting pipes 1, a cylinder 2 with a hollow plunger 3 disposed therein, made with inverse 4 and a safety valve 5 and kinematically through flexible element 6 connected to a drive 7 located at the mouth 8 wells (not shown). The device is equipped with an additional cylinder 9 installed under the plunger 3 with a spring-loaded piston 10 with a rod 11 and sliding dies 12 placed therein. The rod 11 has a kinematic connection 13 with sliding handkerchiefs 1,2 arranged to interact with the column pipe 1. One of the cavities 14 additional cylinder 9 through channel 15 communicates with the cavity of the plunger 3, and the other - 16 through 5 channel 17 - with the sub-plunger space. An elastic seal 18 is installed on the outer surface of the plunger 3, the cavity of which communicates with the plunger cavity through to the holes 19. The fluid enters the well from the formation 20, and from the well into the vikirnuyu line 21.

A device for lifting fluid from wells works as follows.

The device is lowered into the well below the fluid level. The liquid through the gap between the additional cylinder 9 and the column of lifting pipes 1 and the check valve 4 enters the cavity of the plunger 3. With a significant immersion of the hollow plunger 3 under the liquid level, the safety valve is activated

c 5, which is pre-adjusted to open at a certain height of the rise of the liquid column, taking into account the pressure in flow line 21 and the amount of friction of the elastic seal. l 18 about the walls of the cylinder 2. When the plunger 3 is lifted by the device, its valve, 4 is closed, the plunger raises the liquid to the mouth of the 8 well and it is fed to the collecting point via flow line 21. With significant

5, the fluid height at the first pumping time may not flow from the formation 20 into the well. Then, in order to reduce the pressure differential between the above-strung and sub-plunger

0 space, discharge line 21 communicates with the atmosphere, and the liquid is collected in a mobile container.

With increasing pressure under the plug 3, i.e. when an emergency situation is possible, fluid (gas, liquid) through channel 17 enters the cavity 16 of the additional cylinder 9 and, since the pressure above the plunger is less {pressure is transmitted through channel 15, the piston 10 moves up, carried along, rod 11, which, through kinematic connections 13, presses the sliding dies 12 against the walls of the column. lifting pipes 1, resulting in

5, the plunger 3 is stopped. Coming from the reservoir 20, the gas through the valve 4 overcomes the resistance of the liquid column above the plunger 3 and sparks through it, carried away

0 fluid to flow line 21. The pressure ga. Under the piston 10 and above it is leveled, under the action of gravity and the spring the piston descends, and the kinematic connections 13

5 Dice 12 against the walls of the column.

Claims (1)

DEVICE FOR LIFTING LIQUID FROM WELLS, containing a column of lifting pipes, a cylinder with a hollow plunger placed in it, made with non-return and safety valves and kinematically connected with a drive located at the wellhead, characterized in that it is provided with a view of increasing reliability ^ installed · N) lmi under the plunger an additional cylinder with a spring-loaded piston placed in it with a rod and sliding dies kinematically connected with the latter and arranged to interact with onnoy pipes, wherein one of the auxiliary cylinder cavities communicated with the cavity of the plunger, and the other - with the under-plunger space. oo oo 00 Λ