RU89602U1 - DEVICE FOR CLEANING THE OPERATION COLUMN WALLS AND WELL BORE - Google Patents

Abstract

A device for treating the walls of the production casing and the bottom of the well, including a hollow body, brushes, characterized in that the device is additionally equipped with a pen with a valve in the form of a shutter, a hydro-gel, garbage containers, a non-return valve, rippers, scraper brushes, templates with cutting workers surfaces, while part of the scraper brushes is located between the templates.

Description

The utility model relates to the oil and gas industry, and in particular to devices for cleaning the walls of the production casing and the bottom of the borehole from asphalting-resin-paraffin deposits during underground and overhaul of wells. The well cleaning process includes the following operations: cleaning the walls of the production casing, patterning, cleaning the bottom of the well.

A device for cleaning the walls of the well, comprising a housing, in the longitudinal grooves of which are placed brushes consisting of sliders that carry bundles of elastic elements from a spring wire. The case above the brushes is made with radial holes and is equipped with unloading valves (as.with. 732501 class. IPC E21B 37/02).

The disadvantages of the known device are:

- design complexity;

- limited range of their application, i.e. they can be effectively used only in the construction of wells for cleaning and sealing the walls of the wells, in which there are all conditions for bringing them into rotational motion;

- after cleaning the walls of the well, it is necessary to clean the bottom of the well from mechanical impurities.

A device for processing the walls of the well is known comprising a hollow body with connecting threads at the ends, blades with a reinforced working surface and brushes (a.s. 1723311, class E21B 37/02).

A device for attaching a well is known, including a drill pipe string, scrapers to remove clay cake before cementing, a casing with centralizers and scrapers on it, the casing of which is fixed with a fixing element. At the same time, casing scrapers are made with the possibility of installing near permeable formations, caverns or between oil and aquifers and receiving reinforced cement stone there, and the body of the scrapers is made tubular and with holes pairwise located along its generatrix through which scrapers are passed. In addition, the fixing element is made in the form of a hollow cylinder, fitted with an interference fit inside the housing, and a casing pipe is fixed to its lower pipe on the drill string to template the wellbore, on which scrapers are placed between the centralizer and centralizer-turbulators (clay patent) No. 2190754 class IPC E21B 33/14).

The disadvantages of these devices are:

- limited application range, i.e. they can be effectively used only in the construction of wells, in which there are all conditions for bringing them into rotational motion.

- after cleaning the walls of the well, it is necessary to clean the bottom of the well from mechanical impurities.

During the operation of the well, the filter parts of the walls of the production string are clogged with mud, salts and asphalt-tar-paraffin deposits, which sharply reduce the flow of oil, preventing the flow of formation products or pumping fluid to maintain reservoir pressure in injection wells.

Underground well repair teams do not have the ability to use devices that clean the walls of the well by rotating the tubing string. Therefore, in production or injection wells, the wellbore is cleaned by multiple descents and rises of the device in the processing interval. After cleaning the walls of the production casing, it is necessary to clean the bottom of the well from precipitation of resins, salts and solids, dirt. For the descent into the well after the repair of technological equipment, a packer or an instrument for research, it is necessary to carry out the patterning of the inner surface of the production string. Each of the above operations involves different devices, and the operations themselves require separate tripping operations to replace the devices.

The objective of the proposed utility model is to improve the quality of cleaning the walls of the production casing and the bottom of the well, expanding the functionality of the device by combining operations to clean the walls of the production casing of the well, patterning the production casing, and cleaning the bottom of dirt and solids.

The problem is solved in that the device for cleaning the walls of the production casing and the bottom of the well contains a feather connected in series with threaded connections to the valve in the form of flaps, rippers, templates, scraper brushes, garbage storage containers, a water damper, and a check valve. To improve the quality of cleaning the walls of the production casing, the grooves of the templates designed for the passage of fluid are arranged at an angle to the contacting surface of the production casing. Moreover, not only the ends of the template have a cutting work surface, but also the edges of the grooves. The slope of the grooves of the second template is opposite to the slope of the grooves of the first template. Due to the different arrangement of the slope of the grooves of the templates, the internal surface of the production casing is completely cleaned. In addition, part of the scraper brushes is located between the templates.

New in the proposed utility model is that the device further comprises templates that are equipped with a cutting work surface and perform the function of a scraper.

New in the proposed utility model is that part of the scraper brushes is located between the templates, which allows more efficient cleaning of deposits on the walls of the production string.

New in the proposed utility model is that the device is additionally equipped with a waterjet and containers - garbage storage.

Figure 1 shows a General view of the device;

Figure 2 shows a feather in a section;

Figure 3 shows a template in section;

Figure 4 shows a scraper in a section.

A device for cleaning the walls of the production casing and the bottom of the well contains a feather 1, a damper valve 2, a storage container for large debris 3, adapters 4, a cultivator 5, scraper brushes 6, 8, pipe 7. , tubing 10, ripper 11, templates 12, 16, scraper brushes 13, 15, storage container for small debris 17, check valve 18, tubing string 19, couplings 20.

The container-drive of large debris 3 is made in the form of two tubing connected by a coupling 20.

The container-accumulator of small debris 17 contains ten tubing connected in series using couplings.

The body of the ripper 5, 11, the body of the templates 12, 16, the body of the brush-scrapers 6, 8, 13, 15 for the passage of the process fluid are made hollow.

The outer surface of the hollow body 21 of the template has four longitudinal grooves 22, which are designed to circulate the liquid and the passage of solid deposits during cleaning, while not only the edges of the grooves have a working cutting surface, but also the end face of the body.

For high-quality cleaning of the walls of the production casing, the upper 16 and lower 12 templates have different slope angles. The inclination of the grooves of the upper and lower template is made in opposite directions to each other.

The scraper brushes 6, 8, 13, 15 contain a hollow body 23 on which a pressure washer 24 is mounted, figured pressure washers 25, elastic rod-shaped scrapers 27, pressure washer 26. One side of the figured pressure washer is smooth and the other has five grooves , to accommodate rod-shaped scrapers, the ends of which are brought out. In the upper and lower parts, the housing of the brushes - scrapers 6, 8, 13, 15 is equipped with external threads that are designed to connect to other parts of the device, as well as to install internal thread clamping washers 24, 26.

The device operates as follows.

The device in assembled form is lowered on the string of tubing 19 well. Ripper 5 destroys the solid monolithic crust. At the same time, the inserts of the cultivator are destroyed and showered on the bottom of the well, growths that appeared as a result of scaling and paraffin deposition. Scraper brushes 6, 8 clean the walls of the production casing of the scaling layer and paraffin deposits destroyed by the cultivator 5. The front template 12 by the cutting working parts performs semi-finishing treatment of the wellbore, tearing off the remaining layers of resin-paraffin and other contaminants from the walls. The scraper brushes 13, 15 carry out the finishing of the borehole walls, while the quality of cleaning is determined by the condition for passing the back control template 16. When the device is lowered into the well, the inner space of the tubing string is isolated from the downhole fluid by the shutoff device of the baffle. The device descends into the well until it stops at the bottom. As soon as the pen 1, will go deep into the layer of sludge and dirt at the bottom of the well, the device stops. Valves (not specified) of the hydraulic valve 9 open.

Due to the pressure difference in the tubing string 19 and at the bottom of the well, the downhole fluid, together with sludge and dirt, enters the internal cavity of the hydraulic valve 9 and then through the hollow tubing body 10, the hollow body of the ripper 11, the hollow body of the templates 12, 16 and scraper brushes 13, 15 enters the storage container 17. And then into the internal cavity of the tubing string 19.

Large debris accumulates in the storage container 3, small debris rises and accumulates in the storage container 17.

After removing part of the sludge and dirt from the bottom, the tubing string is raised to a height of 1-2 meters and lowered again to the bottom. If it is necessary to maintain the pressure difference in the tubing string and at the bottom of the well, the process fluid is added to the well.

After the end of the process of cleaning the walls of the production casing and the bottom of the well, the device is lifted. The shutter valve 2 closes when lifting. At the wellhead, the device is disassembled.

Storage containers are sent to the disposal sites for sludge and dirt.

The use of the proposed device improves the efficiency of processing the walls of the well, accelerates the process of repairing the well by combining operations to clean the walls of the production casing and bottom hole with the operation of the standardization of the production casing.

During operation during the overhaul, the proposed utility model showed high performance. The proposed utility model is easy to manufacture and convenient to operate.

Claims (1)

A device for treating the walls of the production casing and the bottom of the well, including a hollow body, brushes, characterized in that the device is additionally equipped with a pen with a valve in the form of a shutter, a hydrojet, trash storage containers, a non-return valve, rippers, scraper brushes, templates with cutting workers surfaces, while part of the scraper brushes is located between the templates.