RU59137U1 - DEVICE FOR LOADING ACC AND EXTINGUISHING EXPRESSIVE WELLS - Google Patents

Abstract

The utility model relates to the oil and gas industry, which operates subsoil using wells and relates to production activities in the field of increasing reservoir pressure by pumping process fluid into special wells, in particular during overhaul and underground well repairs. The objective of the utility model is to create a reliable device that allows pumping fluid (anticorrosive fluid) and killing the injection well through the annulus by backwashing without stalling and planting the packer. The task is achieved by the design of the device for pumping fluid and killing injection wells, comprising a body mounted eccentrically to the tubing string and a valve assembly including a saddle with a spring ball located above the packer and which is an integral part of the underground equipment of the injection well. What is new is that the device for pumping fluid and killing injection wells has a larger diameter than the tubing and serves as a centering element in the STR (tripping) layout of the tubing with a packer and, when threaded to the tubing string, is a single unit with the underground equipment of the injection well assembled into the layout. The advantages of the proposed device for pumping fluid and killing injection wells are:

- simplicity of design and, as a consequence, simplicity of manufacture and maintenance;

- the possibility of pumping AKZH and killing the well without disruption of the packer, which saves time, labor costs for additional STR for disruption and landing of the packer;

- having a larger diameter than the tubing serves as a centering element in the STR of the layout of the tubing with a packer;

- when threaded to the tubing string, it is a single unit with underground equipment assembled into a layout.

The use of a device for pumping fluid and killing injection wells eliminates the overflow of fluid in the injection well at the time of application of the device for pumping fluid and killing injection wells at the wellhead when the packer is planted, as a result of which environmental safety is observed and labor and environmental protection conditions are met. A device for pumping AKZh and killing injection wells of repeated action and does not require significant material costs in the manufacture, installation and operation. Currently, experimental work is underway on the use of the proposed device for pumping fluid and killing injection wells when they are undergoing major or underground repairs. If the test result is positive, mass introduction of a device for pumping fluid and pumping and killing injection wells is planned for the production of capital or underground repair of injection wells wells. 1 ill. for 1 liter

Description

The utility model relates to the oil and gas industry, which operates subsoil using wells and relates to production activities in the field of increasing reservoir pressure by pumping process fluid into special wells, in particular during overhaul and underground well repairs.

Known deep sucker rod pump (patent of Russian Federation No. 2157450, class 7 E 21 V 43/00, F 04 B 47/00), which includes a cylinder located in the cylinder with the possibility of reciprocating movement of the plunger with pressure valve installed at the ends cylinder extension nipples with end couplings, a suction valve and a plunger stop. The suction valve is located on the side of the outside of the plunger, i.e. in the annulus.

The disadvantages of this device are:

- design complexity

- the use of electric welding for fastening elements, as a result of which it is impossible to use it when pumping process fluids directly through the tubes at high pressures at injection wells, as well as achieving maximum fluid velocity when pumping through the annulus.

The closest in functional features is a downhole valve device (RF patent No. 2121053, class 6 E 21 B 34/06), containing a hollow body mounted eccentrically to the tubing string (tubing) and made with two holes for communication of its cavity with annular space, a shutter installed with the possibility of blocking the hole communicating the cavity with the annular space, and a shutter travel limiter.

As a shutter, a two-position plunger with lip seals is used, which moves due to the pressure differential between the annulus and the tubing cavity.

The disadvantages of this device are:

- the use of electric welding to fasten the valve to the tubing string, which violates the structure of the metal working in aggressive environments, and an additional weak element appears in the design of the downhole equipment, which can lead to complications;

- the need to create a backpressure in the tubing cavity to move the closure member down in order to separate the tubing cavity from the annulus.

The objective of the utility model is to create a reliable device that allows pumping fluid (anticorrosive fluid) and killing the injection well through the annulus by backwashing without stalling and planting the packer.

The task is achieved by the design of the device for pumping fluid and killing injection wells, comprising a housing mounted eccentrically to the tubing string, and a valve assembly including a saddle with a spring ball located above the packer and which is an integral part of the underground equipment of the injection well.

New is that the device for injecting oil and fluid well and killing injection wells has a larger diameter than the tubing and serves as a centering element in the STR (tripping) layout of the tubing with a packer and when threaded to the tubing string, it is one with the underground equipment of the injection well assembled into the layout.

The proposed design of a device for pumping fluid and killing injection wells is illustrated in the drawing.

The figure 1 schematically shows a device for pumping fluid and killing injection wells.

A device for pumping fluid and killing injection wells includes a housing 3 and a valve assembly 4. The valve assembly 4 consists of a saddle 5 and a ball 6, under which a spring 7 is installed, pressing the ball 6 to the saddle 5.

A device for pumping fluid and killing injection wells in the following way.

The device for pumping fluid-filling fluid and killing injection wells is attached to the tubing string 2 using a threaded connection, thereby constituting a unit in the assembly with a pipe, sleeve and packer (not indicated in figure 1), which increases the operational reliability of the design of the underground equipment of the injection well ..

The assembled assembly is lowered into the injection well 1 by 2.5 ″ or 2 ″ tubing 2. During the operation of injection well 1, the device for pumping fluid and killing injection wells is in an idle state. The involvement of the device for pumping fluid and killing injection wells into operation occurs when the injection well goes into major or underground repairs.

In injection well 1, injection is stopped. The injection well is being prepared for overhaul or underground repair by killing it, while the tubing 2 at the mouth of the injection well 1 is connected to the storage tank (not indicated in figure 1). To create backpressure on the formation, a weighted formation fluid is pumped into the annulus. In the process of injection, an increase in pressure occurs in the annulus, under the influence of which the ball 6 presses the spring 7 in the device for pumping fluid and killing injection wells 7. Through the hole formed by the flow of fluid in the annulus

during the operation of injection well 1, in tubing 2 and pouring it into the storage tank, the AKZH column is replaced by a heavier reservoir fluid in the annulus by the backwash method. After pumping the entire volume of the weighted formation fluid when the pumping is stopped, the ball 6 sits on the saddle 5 under the action of the spring 7 and gravity. After jamming, the underground equipment and the device for pumping fluid and jamming the injection wells are lifted from the injection well 1 for revision and further use.

After the overhaul or underground repair of the injection well and for its commissioning, the device for pumping fluid and killing injection wells is again lowered into the injection well 1 in the same manner as when killing the injection well. To protect the production casing from corrosion, the injection fluid is injected into injection well 1. The process of replacing the volume of heavier formation fluid with injection fluid in the annulus of injection well 1 occurs in the same sequence as when killing injection well 1. After pumping the entire volume of injection fluid and starting injection wells 1 into operation, a device for pumping fluid and killing injection wells remains in the well until the next major or underground repair.

The advantages of the proposed device for pumping fluid and killing injection wells are:

- simplicity of design and, as a consequence, simplicity of manufacture and maintenance;

- the possibility of pumping AKZH and killing the well without disruption of the packer, which saves time, labor costs for additional STR for disruption and landing of the packer;

- having a larger diameter than the tubing serves as a centering element in the STR of the layout of the tubing with a packer;

- when threaded to the tubing string, it is a single unit with underground equipment assembled into a layout.

The use of a device for pumping fluid and killing injection wells eliminates the overflow of fluid in the injection well at the time of application of the device for pumping fluid and killing injection wells at the wellhead when the packer is planted, as a result of which environmental safety is observed and labor and environmental protection conditions are met.

A device for pumping AKZh and killing injection wells of repeated action and does not require significant material costs in the manufacture, installation and operation.

Currently undergoing experimental work on the use of the proposed device for pumping fluid and killing injection wells when they go into major or underground repairs. If the test result is positive, mass introduction of a device for pumping fluid and killing injection wells is planned for the production of overhaul or underground repair of injection wells.

Claims (1)

A device for injecting anticorrosive fluid (ALC) and killing injection wells, comprising a housing mounted eccentrically by a string of tubing and tubing, and a valve assembly including a seat with a spring ball, characterized in that the device is located above the packer and is mechanically connected with a tubing string in a single structure, made larger in diameter than the tubing and being a centering element with the possibility of pumping fluid and killing an injection well through the annulus house backwash without stalling and planting the packer.