RU2271471C1 - Well hydraulic pumping unit - Google Patents

Abstract

FIELD: units for lifting liquids from wells.

SUBSTANCE: proposed pumping unit includes housing with central tube forming three working stages interconnected hydraulically by means of spring-loaded check valves. Sections of central tube located in zones of working stages are tubular diaphragms made from thin-walled alloyed steel. Mounted on boundaries of working stages in central tube are suction valves. Pumping unit is lowered into well by means of lifting pipes and is connected with hydraulic pulsar. Pumping unit is also provided with throttle valve, shut-off unit and storage reservoir.

EFFECT: facilitated procedure of mounting and dismantling of equipment in well; reduced usage of metal.

2 cl, 1 dwg

Description

The invention relates to a pump engineering industry, relates to borehole hydraulic diaphragm pumps, and may find application in various industries for lifting fluid from a well.

A known pump installation (AS No. 1705610, IPC F 04 B 47/04, 1992) containing a drive, upper and lower elastic elements made in the form of an accordion, pressure and lifting pipes, suction and discharge valves, the lower the elastic element is spring loaded.

The disadvantages of the device:

- design complexity;

- the impossibility of creating large pressure drops by a spring-loaded lower elastic element;

- great technological difficulties in the manufacture of elastic elements.

The closest in technical essence to the proposed is a pumping unit (AS No. 1038569, IPC F 04 B 43/06, 47/02, 1983), including a housing with a central pipe installed in it, a tubular diaphragm forming the main working stage, drive and pump chambers, suction and discharge valves, lift pipes and piping connecting the main hydraulic stage with a hydraulic pulsator mounted on the surface.

The installation contains two pipelines, one - pressure, the other - to supply the working fluid from the surface to the pump, which greatly complicates the installation and dismantling of equipment in the well and leads to an increase in metal consumption.

The objective of the invention is the creation of a pumping unit with a simplified installation and dismantling technology and having low metal consumption.

This problem is solved by the proposed borehole hydraulic pumping unit, which includes a housing with a central pipe installed in it, a tubular diaphragm, which form the main working stage and which is a cylindrical cavity of limited volume, a drive and pump chamber, suction and discharge valves, lift pipes and piping that connect hydraulically the main working stage with a hydropulsator mounted on the surface.

What is new is that the pump and drive chambers are combined; the installation is equipped with an additional working stage located under the main one, made similarly to the main working stage and an auxiliary working stage located under the additional one and representing a section of the central pipe, plugged from below; sections of the central pipe structurally included in the working stages are tubular diaphragms; the cylindrical cavities of the main and additional stages in the upper part are connected through spring-loaded valves to the downhole space, and in the lower part also through the valves, the first is connected to the inner space of the tubular diaphragm of the additional working stage, and the second to the inner space of the tubular diaphragm of the auxiliary working stage; suction valves are located inside the central pipe at the boundaries of the working stages; equipped with a throttle and a locking device installed on autonomous pipe bends and connected to the storage tank.

Also new is the fact that tubular diaphragms are made of thin-walled sheet alloy steel.

The drawing shows a diagram of the proposed downhole hydraulic pumping unit.

It consists of a housing 1, inside which a central pipe 2 is concentrically mounted, which form the main 3 and additional 4 working stages, which are cylindrical cavities (A and B). Auxiliary working stage 5 is located below the additional working stage 4 and is a section of the central pipe 2, muffled from the bottom. The sections of the central pipe that are structurally included in the working steps are tubular diaphragms and are made of alloy steel sheet (thickness about 3 mm).

In the upper and lower zones of the cylindrical cavities of the main 3 and additional 4 working stages, spring-loaded check valves 6, 7, 8 and 9 are installed. The valves of the upper zones 6 and 8 pass fluid into the said cavities from the downhole space, and the valves of the lower zones 7 and 9 pass fluid accordingly, from the cylindrical cavity of the main working stage 3 into the inner space of the tubular diaphragm of the additional working stage 4 and from the cylindrical cavity of the additional working stage 4 into the inner space th aperture auxiliary working stage 5.

Suction valves 10 and 11 are installed at the boundaries of the working stages. The housing 1 through the lifting pipes 12 and the pipe 13 is connected to the hydraulic pulsator 14. The installation also includes a throttle 15 and a valve 16 mounted on the autonomous branches of the pipe 13 and connected to the storage tank 17.

The throttle 15 is designed for a certain pressure drop, coupled with the optimal volume of the swelling of the tubular diaphragms of the working stages.

The installation works as follows.

пройдет через дроссель 15 в накопительную емкость 17, а другая

- в центральную трубу 2 и трубчатую диафрагму 20 основной рабочей ступени. Под воздействием давления трубчатая диафрагма 20 раздувается и выталкивает жидкость в объеме

из полости «А» через клапан 7 во внутреннее пространство трубчатой диафрагмы 21, которая также раздувается и выталкивает такой же объем из полости «Б» во внутреннее пространство трубчатой диафрагмы вспомогательной рабочей ступени 5, которая, в свою очередь, также раздувается на такой же объем

. Клапаны 6, 8, 10 и 11 закрыты, т.к. на них воздействует давление, созданное в гидросистеме гидропульсатором.Before the installation, the entire hydraulic system (pipe 13 and lifting pipes 12) through the outlet 18 from the storage tank 17 is filled with liquid when the position of the piston 19 of the hydraulic pulsator in the extreme right position. Then include a hydro pulsator, which in the hydraulic system creates an alternating pressure field. When the piston 19 of the pulsator moves from right to left, a certain volume (V ₁ ) of liquid is supplied to the hydraulic system, of which one part

will go through the inductor 15 into the storage tank 17, and the other

- into the central pipe 2 and the tubular diaphragm 20 of the main working stage. Under the influence of pressure, the tubular diaphragm 20 inflates and pushes the liquid in the volume

from the cavity "A" through the valve 7 into the inner space of the tubular diaphragm 21, which also inflates and pushes the same volume from the cavity "B" into the inner space of the tubular diaphragm of the auxiliary working stage 5, which, in turn, also inflates to the same volume

. Valves 6, 8, 10 and 11 are closed because they are affected by the pressure created in the hydraulic system by a hydro pulsator.

. Одновременно с этим закрываются клапаны 7 и 9 и открываются клапаны 6 и 8, через которые жидкость из внутрискважинного пространства «В» поступает в цилиндрические полости «А» и «Б». Таким образом, при движении поршня 19 слева направо в гидросистему поступит объем жидкости, равный трем объемам

, который больше, чем объем V₁ на величину ΔV (ΔV=3

-V₁). Этот объем ΔV и поступит через дроссель 15 в накопительную емкость 17 к моменту, когда поршень 19 займет крайнее правое положение (конец цикла). Далее поршень снова будет двигаться справа налево (следующий цикл), и весь процесс будет происходить так, как был описан выше. По мере накопления жидкость из емкости 17 будет откачиваться.When the piston 19 of the hydraulic pulsator moves from left to right, a rarefaction occurs in the hydraulic system (pressure drop), the valves 10 and 11 open, the tubular diaphragms 20, 21 and 5 return to their original position, each of which pushes a volume of liquid equal to the lifting tubes 12

. At the same time, valves 7 and 9 are closed and valves 6 and 8 open, through which fluid from the downhole space “B” enters the cylindrical cavities “A” and “B”. Thus, when the piston 19 moves from left to right, a fluid volume equal to three volumes will enter the hydraulic system

which is larger than the volume V ₁ by ΔV (ΔV = 3

-V ₁ ). This volume is ΔV and enters through the inductor 15 into the storage tank 17 to the moment when the piston 19 occupies the extreme right position (end of cycle). Further, the piston will again move from right to left (next cycle), and the whole process will occur as described above. As accumulation of fluid from the tank 17 will be pumped out.

, будет в пределах 50-67% от объема (V₁), подаваемого гидропульсатором в гидросистему за один цикл. Цифры получены расчетным путем.The system will work in normal and stable mode if the total volume passed through the throttle

, will be in the range of 50-67% of the volume (V ₁ ) supplied by the hydro-pulsator to the hydraulic system in one cycle. The numbers are calculated.

Due to the fact that the drive and pump chambers in the proposed installation are combined, a certain simplification of the design is achieved, installation and dismantling of the installation are simplified, metal consumption is noticeably reduced, which ultimately will save significant material resources.

Claims (2)

1. Hydraulic borehole pumping unit, comprising a housing with a central pipe installed in it, a tubular diaphragm forming the main working stage, and representing a cylindrical cavity of limited volume drive and pump chambers, suction and discharge valves, lift pipes and piping connecting the hydraulically main working stage with a hydropulsator mounted on the surface, characterized in that the pump and drive chambers are combined, the installation is equipped with an additional working dull, located under the main one, performed similarly to the main working stage, and an auxiliary working stage, located under the additional and representing a section of the central pipe, muffled from below, sections of the central pipe that are structurally included in the working stages are tubular diaphragms, cylindrical cavities of the main and additional working steps in the upper part are connected via spring-loaded valves to the downhole space, and in the lower part the first is connected to the inner space nstvom tubular aperture additional working stage, and the second - with the internal space of the tubular aperture of the auxiliary working stage, the suction valves are arranged inside the central pipe at the boundaries of the working stages, the unit is provided with a throttle and shut-off device mounted on the autonomous tap conduit and connected to the storage tank. 2. Installation according to claim 1, characterized in that the tubular diaphragms are made of thin-walled alloy steel sheet.