RU2505708C1 - Well sucker-rod pump station - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device is designed for usage in oil production industry to deliver working medium (wash liquid, steam, chemical reagent) to the well for cleanout purpose. Station consists of tubing string 1, oil well pump 2, discharger 3, rod string 4, 5, beam-pumping unit, unit 6 for kinematic connection of rod string 4, 5 with beam-pumping unit, water swivel 7, hose 8, unit 9 for delivery of working medium (wash liquid, steam, chemical reagent) to the well for cleanout purpose. Tubing string 1 is installed inside the well casing string; oil well pump 2 is connected hydraulically with tubing string 1, rod string 4, 5 by its lower end is connected kinematically to oil well pump 2 and by its upper end through water swivel 7 and unit 6 to beam-pumping unit. The upper part 4 of rod string 4, 5 is made hollow; it is designed to drive oil well pump 2 (together with lower part 5) both for working medium delivery to cavity of tubing string 1. Discharger 3 is installed at the lower end of hollow part 4 of rod string 4, 5. Discharger 3 is made either as open channel for continuous delivery of working medium (wash liquid, steam, chemical reagent) or as overflow valve for dosing of working medium (chemical reagent).

EFFECT: expanding functionalities of the station due to well washing by liquid, simplifying construction and operation.

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Description

Field of technology and purpose

The invention relates to oil production, namely to downhole sucker rod pumping units equipped with working fluid supply devices for cleaning wells (for flushing wells with liquid, steam, or dosed supply of reagent into the well through a channel of hollow rod pipes).

State of the art

A device for the dosed supply of reagent into a well equipped with a rod pump, containing a container for the reagent, located under the rod pump, and a plunger metering pump with a drive, while the drive of the plunger metering pump is made in the form of a cylinder with spring-loaded blocks for fixing it in the well and placed in the cylinder with a piston clearance with a rod and a limiter, the rod being connected to the metering pump plunger, and the limiter mounted to interact with the plunger cylinder black dosing pump (ed. St. SU No. 105559 A1, ЕВВ 43/00, 1980).

The reason that prevents the obtaining in a known technical solution of a technical result, which is provided by the invention, is the location of the reagent supply device in the well under the sucker rod pump. This is the reason for the considerable complexity of the device both in design and operation. The known device, in addition, has a low accuracy of dosing of the reagent (especially with high viscosity), as well as insufficient reliability of the design due to the large number of nodes difficult to manufacture. All this leads to low dosing efficiency.

The closest analogue (prototype) is a device for dosed supply of a chemical reagent into a well, containing a dispenser in the form of a plunger pump hydraulically connected to a container for a chemical reagent and a discharge line made in the form of a flexible hose in communication with a column of hollow rods in the upper part of the column hollow rods mounted check valve, and in the lower part of the exhaust valve for directing the chemical into the cavity of the tubing, while the pump drive is kinematically connected to the balancer stack for rocking (automatic communication SU №1837101 A1;.. E21B 37/06; published 30.08.1993 Bul №32...).

Signs that are common to the known and claimed solutions are that the known device comprises a dispenser hydraulically connected to a container for a chemical reagent and a discharge line made in the form of a flexible hose in communication with a column of hollow rods, in the upper part of the column of hollow rods installed check valve, and at the bottom of the exhaust valve for directing the chemical into the cavity of the tubing.

The reason that prevents obtaining a technical result in a known technical solution that is provided by the invention is that the reagent supply device is driven by a rocking machine, as a result of which the reagent supply is unregulated, it has a pulsating nature, since the stroke of the pump plunger included in the supply device reagent is determined by the speed of the gearbox of the rocking machine. As a result, short-term (pulsating) in time interaction of the chemical reagent with deposits in the well, which requires a large consumption of the chemical reagent and a longer duration of exposure to the chemical reagent to ensure complete removal of the products of exposure to the chemical reagent in the well. In addition, in the known installation, the implementation of the line for injecting the chemical reagent into the well in the form of a flexible hose without using a swivel is possible only with its placement (hose) in the column of hollow rods, which reduces the reliability of the injection line and limits the scope of the installation only to the supply of the reagent (i.e. . the supply of flushing fluid in a known installation is technically difficult). In addition, in the known technical solution, the outlet device is made in the form of a valve for dosed supply of the reagent into the well, which limits the functionality of the known technical solution, since it does not provide for the possibility of washing the well with liquid.

SUMMARY OF THE INVENTION

The problem to which the invention is directed, is to expand the functionality of the installation due to the possibility of not only cleaning the well with a reagent, but also liquid, steam; in simplifying the design and operation, in the ability to regulate the well cleaning process.

The technical result that mediates the solution of this problem lies in the possibility of implementing the specified additional functions, which generally expands the functionality of the installation; in the exclusion of the dependence of the supply process to the well of the working fluid for cleaning the well from the operation of the pumping unit.

The technical result is achieved by the fact that the well sucker rod pump installation comprises a tubing string, a sucker rod pump, an outlet device, a rod string, a pumping unit, a flushing swivel, a hose, and a working fluid supply device for cleaning a well made with an autonomous drive wherein, the downhole sucker rod pump is hydraulically connected to the tubing string, the sucker rod kinematically connected to the downhole sucker rod pump with its lower end, and through the top washing swivel with a rocking machine, at least the part of the rod string, which is the upper one, is made hollow and the upper end of its hollow part is hydraulically connected through the said washing swivel and hose to the working fluid supply device, and the exhaust device is mounted on the lower end of the hollow part of the rod string and is made either with an open channel for continuous supply of the working fluid, or in the form of a bypass valve for dosed supply of the working fluid.

New features of the invention are the presence of a washing swivel, in the implementation of the exhaust device with an open channel for continuous supply of the working fluid for cleaning the well, in the implementation of the supply of the working fluid with an autonomous drive.

List of drawings

The drawing shows a downhole sucker rod pump installation.

Information confirming the possibility of carrying out the invention

A downhole sucker rod pump installation comprises a tubing string 1, a downhole sucker rod pump 2, an outlet device 3, a sucker rod string 4, 5 (where 4 is the upper part of the sucker rod string; hollow; 5 - the lower portion of the sucker rod string or sucker rod rod 2, either one or the other, connected in series), a rocking machine (not shown), a kinematic connection unit 6 of the rod string 4, 5 with the rocking machine, a flushing swivel 7 (the swivel 7 is connected to the rod rotator, which is suspended from the cable suspension, by the upper part) rocking machine) , a hose 8, and also the device 9 of supply of a working fluid. While the tubing string 1 is installed inside the casing string of the well; the borehole pump 2 is hydraulically connected to the tubing string 1, the rod string 4, 5 is kinematically connected to the borehole pump 2 by its lower end (lower end of the lower part 5) and through the flushing upper end (upper end of the upper part 4) swivel 7 and node 6 with a rocking machine. The upper part 4 of the rod string 4, 5 is hollow and is designed both to drive the borehole sucker rod pump 2 (together with the lower part 5) and to supply the working fluid to the cavity of the tubing 1. The exhaust device 3 is installed on the lower end of the hollow part 4, i.e. kinematically connects both parts 4 and 5 of the said column of rods. In this case, the exhaust device 3 is made either with an open channel for continuous supply of the said working fluid (in the form of a bypass sub for supplying flushing fluid to the cavity of the tubing), or in the form of a bypass valve for dosed supply of the said working fluid (reagent). The bypass valve comprises a seat, a ball located in the seat, and a spring (not shown). As a working fluid for cleaning the well, flushing fluid, steam or reagent can be used. The device 9 for supplying the specified working fluid is made with an autonomous drive and is hydraulically connected via a hose (flexible sleeve) 8 and a flushing swivel 7 with a cavity of the upper part 4 of the rod string 4, 5.

The operation of a borehole sucker-rod pumping unit is carried out in two ways.

In the first embodiment of the installation, the wells are flushed. Flushing can be carried out both when the pump 2 is running and when it is stopped. For this, a bypass sub having openings in the side wall (i.e., an open channel for continuous supply of the working fluid) is preliminarily installed as an outlet device 3. In this case, washing fluid is used as a working fluid, for example, hot coolant, which, using a fluid supply device 9 containing an appropriate container and a pump (not shown), through a hose 8, a swivel 7, a hollow (upper) part 4 of the rod string and the lateral openings of the sub (exhaust device 3) are fed into the cavity of the tubing string 1. In this case, the working fluid (fluid) moves inside the tubing string 1 and enters the flow line 10 (fluid movement is shown in the drawing arrows).

In the second embodiment of the installation, the dosed supply of the working fluid (reagent) is carried out. For this, a bypass valve is preliminarily installed as an outlet device 3. By means of a device 9 containing a corresponding container with a reagent and a metering pump (not shown), the reagent is fed through the hose 8, swivel 7, the hollow (upper) part 4 of the rod string and the side openings of the bypass valve (exhaust device 3) into the pump cavity -compressor pipes 1. At the same time, the generated pressure in the upper (hollow) part 4 of the rod string 4, 5 compresses the spring of the bypass valve (exhaust device 3), as a result of which the ball is squeezed from the seat of this valve and, through the opening window in the valve body, e body (reagent) in a specific amount is supplied into the cavity of the tubing pipe 1 (the structural elements of the overflow valve not shown).

Claims (1)

A downhole sucker rod pump installation, which contains a tubing string, a sucker rod pump, an outlet device, a sucker string, a rocking machine, a flushing swivel, a hose, and a working fluid supply device for cleaning a well made with an autonomous drive, while the sucker rod pump is hydraulically connected to the tubing string, the sucker rod kinematically connected to the borehole sucker pump with its lower end, and the upper one through the swivel swivel with the pumping machine at least the part of the rod string, which is the upper one, is made hollow and the upper end of its hollow part is hydraulically connected through the said swivel swivel and hose to the working fluid supply device, and the exhaust device is installed on the lower end of the hollow part of the rod string and is made either with the open a channel for continuous supply of the working fluid, or in the form of a bypass valve for dosed supply of the working fluid.