RU2474672C1 - Device for liquid cleaning in well shaft - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: device comprises a plug, a gravity filter, a debris accumulating container and a slot-type connection pipe, which are located in an upward direction. Besides, the proposed invention includes coupling sleeves, lower and upper umbrella-shaped rubber sealer of the well intertube space. The plug is provided with a valve with a seat diameter that exceeds maximum size of the well flush debris. Gravity filter has longitudinal slots and is closed with a fine-meshed screen. Size of the screen meshes is less than minimum size of impurities trapped in the well. Lower umbrella-shaped rubber sealer of the intertube space is arranged on the outer side of the debris accumulating container. Sealer is located between two sleeves at the distance from the plug, which is equal to 15-20% of total length of the device. Upper umbrella-shaped rubber sealer of the intertube space is arranged on the outer side of the debris accumulating container. Sealer is located between two sleeves at the distance from upper end of the device, which is equal to 15-20% of total length of the device. Slot-type connection pipe is provided with longitudinal slots with the width that exceeds maximum size of the well impurities.

EFFECT: improving the liquid cleaning in the well shaft from the floating debris and suspended particles.

1 cl, 1 dwg

Description

The invention relates to the oil industry and may find application in cleaning fluid in a wellbore from floating debris and suspended particles.

A well-known well complex for conducting flushing technology, consisting of technological equipment for conducting underground and major repairs of wells, production casing, tubing, base part, modular part for cleaning the bottom hole and the modular part for cleaning the bottom-hole formation zone. The basic part includes the technological layout of the hydraulic valve with a bypass valve with an adjustable throttle clutch and pipes with the ability to adjust the fluid flow rate to create depression and use the hydrostatic pressure drop, which provides a complete cleaning cycle. The modular part for cleaning the bottom hole contains a drill bit with the possibility of milling and loosening sand plugs, and the modular part for cleaning the bottom-hole zone of the formation includes a slit pipe filter, a screening centralizer and equipment in the form of tubing, which are both a container for collecting dirty liquid and sludge ( RF patent No. 84048, IPC Е21В 27/00, published on June 27, 2009).

Closest to the proposed invention in technical essence is a device for processing the walls of the production casing and the bottom of the well, including a hollow body, brushes, while the device is additionally equipped with a pen with a valve in the form of a shutter, a hydraulic valve, garbage storage containers, a check valve, cultivators, brushes - scrapers, templates with cutting work surfaces. A part of the scraper brushes is located between the templates (RF patent No. 89602, IPC ЕВВ 37/02, publ. 10.12.2009 - prototype).

A disadvantage of the known technical solutions is that the device is not able to clean the well fluid from suspended solids. When lifting the scraper brush, the production casing is additionally cleaned of contaminants that settle on the bottom or are in suspension, which subsequently affects the operation of the downhole pumping equipment. Repeated tripping operations, if the goal is reached to clean the bottom, as a rule, are not performed, therefore, suspended particles remain in the wellbore. The used annular annular sealant, which collects large floating debris underneath it during descent, squeezing it to the bottom with the subsequent intake into the hydroprotector, cannot be closely adjacent to the wall of the production string and, moreover, cannot be self-compacting, because when triggered, the hydraulic valve allows fluid to slip over the movable sealant to carry floating debris.

In the proposed invention solves the problem of more efficient cleaning of the well fluid.

The problem is solved in that the device for cleaning fluid in the wellbore, including the garbage storage container and valve, according to the invention, further comprises a plug and a filter settler located below, and located above the garbage storage container, a slot nozzle, couplings and a lower and upper umbrella-shaped rubber sealant of the annulus of the well, the valve is located in the plug and has a diameter of the saddle larger than the maximum size of contaminants in the well, the filter sump is made longitudinal gaps and closed with a fine mesh mesh with a mesh size less than the minimum size of the trapped dirt in the well, the lower umbrella-shaped rubber sealant of the annular space is placed outside the waste container between the two couplings at a distance from the plug equal to 15-20% of the total length of the device, the upper umbrella-shaped rubber the annulus sealant 7 is placed outside the garbage storage container between two couplings at a distance from the upper end of the device equal to 15-20% of the total length of the mouth oystva, the slit nozzle is formed with longitudinal slits of width greater than the maximum size of the impurities in the well.

Figure 1 presents the claimed device.

The device consists of plugs 1 located from the bottom up, sediment filter 2, garbage container 3, slotted nozzle 4, couplings 5 and bottom 6 and upper 7 of the umbrella-shaped rubber sealant in the annulus 8. Well 9 contains a valve 9 with a seat diameter 10, large maximum size of contamination in the well. The filter-sump 2 is made with longitudinal slots 11 and is closed by a fine mesh 12 with a mesh size smaller than the minimum size of trapped contaminants in the well. The lower umbrella-shaped rubber sealant of the annulus 6 is placed outside the garbage storage container 3 between the two couplings 5 at a distance from the plug 1, equal to 15-20% of the total length of the device. The upper umbrella-shaped rubber sealant of the annulus 7 is placed outside the garbage storage container 3 between two couplings 5 at a distance from the upper end of the device equal to 15-20% of the total length of the device. Slotted pipe 4 is made with longitudinal slots 13 wider than the maximum size of contaminants in the well. Through the upper sleeve 5, the device is connected to a pulling member such as a geophysical cable, cable, rope, etc. (not shown).

The device operates as follows.

When the device is lowered down into the borehole 8, the lower 6 and the upper 7 umbrella-shaped rubber sealants of the annular space of the borehole 8 slide along the walls of the borehole 8, partially passing liquid and part of the impurities along the borehole walls 8. The main fluid stream with impurities opens valve 9 of plug 1 and passes through the seat 10, passes inside the filter-settler 2, inside the garbage storage container 3, inside the slotted pipe 4 and exits through the slots 13 into the well 8.

When lifting the device upward in the borehole 8, the valve 9 closes, the lower 6 and the upper 7 umbrella-shaped rubber sealants of the annular space of the borehole 8 are pressed against the walls of the borehole 8 and slide along the borehole walls 8, practically not passing fluid and dirt along the borehole walls 8. The entire fluid flow with contaminants passes through the slots 13 into the slotted nozzle 4, passes inside the container of the garbage collector 3, inside the settling filter 2 and exits through the longitudinal slits 11 of the fine mesh mesh 12 into the well 8. this pollution is delayed by the fine mesh 12, accumulate first inside the filter-sump 2, and then inside the storage container 3. The device with the pollution is lifted from the well and cleaned of dirt. If necessary, the cleaning of the well is repeated until complete cleaning.

During the descent and ascent of the device in the well, it is possible to touch and even hit the device against the wall of the well, especially in places of sharp curvature. In order to avoid breakdown of the most sensitive elements, such as a plug and a fine mesh, the lower umbrella-shaped rubber sealant of the annulus, which simultaneously acts as a shock absorber and centralizer, is close to the lower end of the device and placed at a distance from the plug equal to 15-20% of the total length of the device . In order to avoid damage to the device suspension, the upper umbrella-shaped rubber sealant of the annular space is close to the upper end of the device and placed outside the garbage storage container at a distance from the upper end of the device equal to 15-20% of the total length of the device. Placing the sealants between the couplings contributes to their retention by the couplings in a given place.

The choice of the size of the slots of the slotted nozzle and the diameter of the valve seat is greater than the maximum size of contaminants in the well, which allows you to collect the entire set of contaminants of any size into the device.

The mesh size of the fine-mesh mesh is less than the minimum size of trapped contaminants in the well, which allows the device to retain the entire set of specified contaminants in the well.

All contamination cannot be collected in the well. There are so small contaminants that special filters are required to collect them. However, such contaminants should not be collected due to the absence of their negative impact on the operation of deep-well pumping equipment. The objective of this device is to collect contaminants of a size slightly smaller than those that adversely affect the operation of deep-well pumping equipment. Cleaning from such contaminants ensures the normal operation of the equipment after cleaning the fluid in the well. The mesh size of the fine mesh is selected from the condition for the collection of the corresponding contaminants in the device.

As a result of the use of the claimed device, it is possible to clean the fluid in the well from contamination.

The application of the proposed device will effectively clean the fluid in the well from contamination.

Claims (1)

A device for cleaning fluid in a wellbore, including a garbage storage container and a valve, characterized in that it further comprises a plug and a filter settler located below and a garbage pipe located above, a slot nozzle, couplings and a lower and upper umbrella-shaped rubber annulus sealant of the well’s space, the valve is located in the plug and has a seat diameter larger than the maximum size of contaminants in the well, the filter sump is made with longitudinal slots and closed finely a mesh with a mesh size less than the minimum size of trapped contaminants in the well, the lower umbrella-shaped rubber sealant of the annular space is placed outside the waste container between the two couplings at a distance from the plug equal to 15-20% of the total length of the device, the upper umbrella-shaped rubber sealant of the annular space 7 placed outside the garbage storage container between two couplings at a distance from the upper end of the device equal to 15-20% of the total length of the device, slotted nozzle made with longitudinal slits wider than the maximum size of contamination in the well.

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