RU42577U1 - WELL CLEANING DEVICE - Google Patents

Abstract

The proposal relates to the oil industry and can be used as equipment for cleaning the bottomhole formation zone and borehole bottom from sludge, sand, paraffin, resins and other deposits difficult to be washed by washing. A well cleaning device comprises a hollow rod with an annular protrusion and a knock-off valve and a compression spring mounted on it, a body with a check valve connected to the packer, the hollow rod being made with radial channels located in two rows separated by a blank transverse partition, in the original position overlapped by a sleeve mounted on a hollow stem with the possibility of longitudinal movement and interaction with the above compression spring and packer, shear and sealing elements. The device is equipped with a barrel with a figured groove on the outer surface with alternating longitudinal short and long sections and a cone rigidly located on it, as well as mounted on the barrel of the cage with a guide pin located in the aforementioned curved groove, and in the cage along its circumference are slips spring-loaded in radial direction, while the barrel is connected to the housing by means of a sub, while the device with the barrel has the possibility of longitudinal movement along the path of the figured groove relative to tionary spring-loaded slip, ring and guide pin. The packer is made prefabricated in the form of a unit consisting of a movable cylinder having cylindrical samples on the outer and inner surfaces, an insert on the outer surface of which gear notches, stoppers and cuffs are made, the team is made in the form of alternating elastic and rigid rings, while the insert has an annular sample, and the movable cylinder is equipped with through radial channels in which stoppers are arranged with eccentricity, made in the form of steel balls fixed in the above ring sample with by means of a support connected to the movable cylinder by means of a shear element, the housing being connected from above to the packer insert by means of a shear element and provided with a lock ring on the inner surface, while the movable cylinder of the packer in the transport position is connected to the polish rod by means of a shear element.

The proposed device has an increased efficiency of well cleaning, since the packer’s prefabricated design allows the device to be sealed in the required interval of the well, and it is guaranteed to be removed in the event of an leaky fit or after prolonged use, which generally reduces the time of work and, as a result, reduces material and financial expenses. 3 ill. for 1 liter

Description

The proposal relates to the oil industry and can be used as equipment for cleaning the bottomhole formation zone and borehole bottom from sludge, sand, paraffin, resins and other deposits difficult to be washed by washing.

A device for cleaning a well is known (RF Patent No. 2186947, IPC 7 E 21 B 37/00, publ. Bull. No. 22 of 08/10/2002), containing a hollow rod with an annular protrusion and a whipping valve and a compression spring mounted on it, a housing with a check valve connected to the shank and the packer, including the expanding cone, the hollow stem and the shank made with radial channels, while the radial channels in the hollow stem are arranged in two rows, separated by a blank transverse partition, in the initial position covered by a sleeve, installed ohm on the hollow stem with the possibility of longitudinal movement and interaction with the compression spring and the expanding cone, made with a cylindrical selection on the inner surface, and in the initial position, the expanding cone is connected to the body and the hollow rod using shear elements, and in the working position interacts with the protrusion of the case and a hollow stem with a protrusion of the expanding cone, shear and sealing elements.

Significant disadvantages of the device are:

- low efficiency of the device, due to the fact that the radial channels of the shank with a blank bottom are clogged with sludge and contamination of the reservoir;

- the presence of a shank in the design of the device limits its use and makes it impossible to use it in open-hole wells, with side and horizontal shafts, since unloading is required for the bottom of the well.

The closest in technical essence to the proposed one is a device for cleaning a well (Utility Model Patent of the Russian Federation No. 37142, IPC 7 E 21 B 37/00, publ. Bull. No. 10 of 04/10/2004) containing a hollow rod with an annular protrusion and a knock-off valve and a compression spring mounted on it, a body with a check valve connected to a packer including an expanding cone, the hollow rod being made with radial channels arranged in two rows separated by a blank transverse partition, in the initial position blocked by a sleeve, mouth copulating hollow rod with the possibility of longitudinal movement and cooperation with the aforementioned compression spring and expanding taper formed with a cylindrical inner surface on the sample, shear and

sealing elements, while the device is equipped with a barrel with a figured groove on the outer surface with alternating longitudinal short and long sections and a cone rigidly located on it, as well as mounted on the barrel of the cage with a guide pin placed in the aforementioned figured groove, and in the cage around its circumference slips are installed, spring-loaded in the radial direction, while the barrel is connected to the housing by means of a sub, while the device with the barrel has the possibility of longitudinal movement along trajectories of the figured groove relative to the spring-loaded slips, cage and guide pin.

A significant drawback of the device is that when the device is lowered into the well, the packer sealing element due to its tubular shape can be damaged or torn off when it comes into contact with the walls of the well, especially for old wells, where the walls have growths in the form of solid deposits. As a result, we have a leaky packer fit, which significantly reduces the efficiency of well cleaning.

Another disadvantage of the device is the difficult removal of the device from the well in case of its leaky fit or after prolonged use, since the device’s design does not include the possibility of its extraction with a standard fishing tool.

The objective of the utility model is to increase the efficiency of well cleaning due to a more hermetically sealed packer and guaranteed removal of the device in case of its leaky landing or after prolonged use.

This problem is solved by the proposed device, containing a hollow rod with an annular protrusion and mounted on it with a whip valve and a compression spring, a body with a check valve connected to the packer, and the hollow rod is made with radial channels located in two rows, separated by a blank transverse partition, in the initial position, a closed sleeve mounted on a hollow stem with the possibility of longitudinal movement and interaction with the above compression spring and packer, shear and sealing e elements, the device is equipped with a barrel with a figured groove on the outer surface with alternating longitudinal short and long sections and a rigid cone located on it, as well as mounted on the barrel of the cage with a guide pin located in the aforementioned figured groove, and in the cage around its circumference are installed the slips are spring-loaded in the radial direction, while the barrel is connected to the housing by means of a sub, while

the device with the barrel has the possibility of longitudinal movement along the trajectory of the figured groove relative to the spring-loaded slips, cage and guide pin.

New is that the packer is made prefabricated in the form of a unit consisting of a movable cylinder having cylindrical samples on the outer and inner surfaces, an insert on the outer surface of which gear notches, stoppers and cuffs are made, made by the team in the form of alternating elastic and rigid rings, wherein the insert has an annular selection, and the movable cylinder is equipped with through radial channels in which stoppers are arranged with eccentricity, made in the form of balls fixed in the above ring This is done with a support connected to the movable cylinder by means of a shear element, the housing being connected from above to the packer insert by means of a shear element and provided with a locking ring on the inner surface, while the movable cylinder of the packer in the transport position is connected to the hollow rod by means of a shear element.

In figures 1 and 2 shows the proposed device in longitudinal section. It contains a hollow rod 1 (see Figure 1) with an annular protrusion 2 and two rows of radial channels 3 and 4, separated by a blank transverse partition 5, in the initial position, overlapped by a sleeve 6, made with a cylindrical sample 7 on the inner surface and mounted on hollow stem 1 with the possibility of longitudinal movement. A compression spring 8 is installed between the protrusion 2 of the hollow rod 1 and the sleeve 6. The hollow rod 1 is rigidly connected from below to the packer 9, consisting of a movable cylinder 10 having cylindrical samples on the outer 11 and inner 12 surfaces. In the outer 11 cylindrical sample of the movable cylinder 10, an insert 13 is concentrically disposed, having gear notches 14 on the outer surface, and an annular sample 15 on the inner surface. On the sleeve 11 is a prefabricated cuff 16 in the form of alternating elastic 17 and hard 18 rings. The movable cylinder 10 is equipped with through radial channels 19, in which the stoppers 20 are made in the form of steel balls and are fixed in the aforementioned annular sample 15 by means of a support 21 connected to the movable cylinder 10 by means of a shear element 22. From above, the housing 23 is connected to the insert 13 of the packer 9 by means of a shear element 24 and is equipped on its inner surface with a locking ring 25, while the movable cylinder 10 of the packer 9 in the initial position is connected to the hollow rod 1 by means of a shear element 26-coagulant, and in the operating position cooperates with the housing 23, the protrusion 27 and the hollow rod 1 - with the projection 28 of the movable cylinder 10. The housing 23 contains a check

valve 29 (see Figure 1), and in the upper part of the hollow rod 1 - knockdown valve 30. The housing 23 is rigidly connected to the barrel 31 (see Figure 2) by means of a cone 32.

On the outer surface of the barrel 31, a shaped groove 33 is made, with alternating longitudinal short and long sections. On the barrel 31 with a possibility of axial movement of the cage 34. The guide pin 35 of the cage 34 is placed in a figured groove 33. In the cage 34 along its circumference are slips 36, spring-loaded in the radial direction. The mating surfaces are provided with sealing elements 37. The hollow rod 1 with the interior of the tubing string 38 forms a depression chamber 39 under atmospheric pressure.

The device operates as follows.

The device on the tubing string 38 is lowered into the well with the expectation that the spring-loaded slips 36, and therefore the packer 9, are higher than the perforations of the reservoir (see Figure 1). Then the device is raised by about 1 meter and again lowered as a result of the guide pin 35 (see Figure 3) is moved to a long section of the figured groove 33, since the spring loaded slips 36 are in contact with the walls of the well, fixing a clip 34 with the guide pin 35 relative to it. As a result, all parts of the device with the exception of parts 34, 35, 36 are moved downward relative to them. In this case, the cone 32 is included in the slips 36, booster their gear part to the inner wall of the well. Then the tubing string 38 is unloaded onto the spring-loaded slips 36, which are already fixed on the inner wall of the well (not shown in Figs. 1 and 2). As a result of this, the shear element 24 is destroyed and the movable cylinder 10 of the packer 9 lowers down to the protrusion 27 and compresses the cuff 16, while the elastic rings 17 are pressed against the walls of the well, thereby separating the borehole space of the reservoir, and the retaining ring 25 is fixed on the serrated notches 14 inserts 13.

With further unloading of the tubing string 38 to the spring-loaded slips 36, the shear element 26 is destroyed and the hollow rod 1 drops down to the protrusion 28 of the movable cylinder 10. At this point, the rows of radial channels 3 and 4 communicate with each other in a cylindrical sample 7, and the inner space of the hollow rod 1 and the tubing string 38 with the inner space of the packer 9. And since there is atmospheric pressure inside the tubing string 38, a significant depression is created on the formation. Under the influence of pressure differences, pollution and cuttings from the formation, from the bottom and from the walls of the borehole through the internal spaces of the barrel 31, the movable cylinder 10 and the radial channels 3 and 4 fall into the upper part of the hollow rod 1 and then into the tubing string 38. After a short period of time (just a few seconds is the time for

each well and each formation is different and depends on the reservoir pressure, porosity, permeability of the formation and the degree of its contamination, it is determined experimentally) the tubing string 38, and with it the hollow rod 1 is raised to the calculated height, while the sleeve 6 under the action of the spring 8 sits on the starting place, and the radial channels 3 and 4 are disconnected from each other and the implosive effect on the reservoir ceases.

Then the tubing string 38 is again unloaded onto spring-loaded slips 36 in contact with the wall of the well and thereby resume depression on the formation. And so they repeat several cycles until the pressure is equalized inside the tubing string 38 and under the packer 9. After completion of the well cleaning operations, the device is lifted to the surface, while the sleeve 6, under the action of the spring 8, closes the radial channels 3, so that all contaminants from the well will be inside the hollow rod 1 and tubing string 38. A packer 9 remains in the well, consisting of a movable cylinder 10, insert 13, cuff 16, stoppers 20 and body 23 with a check valve 29, a barrel 31 with a clip 34 and a guide pin 17, as well as a spring-loaded e slips 36. To drain the fluid from the tubing string 36, the load is dropped before it is lifted and the relief valve 30 is destroyed. Depression on the formation can be controlled by pouring the calculated volume of fluid into the tubing string 38. Then, the pump is lowered into the well and development and operation are carried out in in the usual manner.

If necessary, after prolonged use or a leaky fit, the device can be removed from the well. For this purpose, a standard commercially available fishing tool (for example, an inner tube) is lowered into the well, lowering it to the packer 9, the fishing tool is slowly inserted into the inside of the movable sleeve 10 and clings to the lower end of the support 21, after which they begin to raise the fishing tool, when This collapses the shear screw 22, as evidenced by the growth, and then a sharp drop in pressure, which is observed according to the weight indicator located at the wellhead. The support 21 rises up, and the stoppers 20 in the eccentricity position fall out of the radial channels 19 of the movable cylinder 10, while the elastic rings 17 of the cuff 16 extend from the walls of the well and the packer 9 returns to its original position, after which the device is removed to the day surface.

The proposed device has an increased efficiency of well cleaning, since the packer’s prefabricated design allows the device to be sealed in the required interval of the well, and it is guaranteed to be removed in the event of an leaky fit or after prolonged use, which generally reduces the time of work and, as a result, reduces material and financial expenses.

Claims (1)

A device for cleaning a well, comprising a hollow rod with an annular protrusion and a knock-off valve and a compression spring mounted on it, a body with a check valve connected to the packer, the hollow rod being made with radial channels arranged in two rows separated by a blank transverse partition, in the initial position of the overlapped sleeve mounted on the hollow stem with the possibility of longitudinal movement and interaction with the above compression spring and packer, shear and sealing elements, while The equipment is equipped with a barrel with a figured groove on the outer surface with alternating longitudinal short and long sections and a cone rigidly located on it, as well as mounted on the barrel of the holder with a guide pin placed in the aforementioned figured groove, and in the holder along its circumference are slips spring-loaded in radial direction, while the barrel is connected to the housing by means of a sub, while the device with the barrel has the possibility of longitudinal movement along the path of the curly groove flax-loaded spring-loaded slips, clips and a guide pin, characterized in that the packer is prefabricated in the form of an assembly consisting of a movable cylinder having cylindrical samples on the outer and inner surfaces, an insert on the outer surface of which gear notches, stoppers and cuffs are made, made in the form of alternating elastic and rigid rings, while the insert has an annular selection, and the movable cylinder is equipped with through radial channels in which the stoppers are arranged with eccentricity, in the form of balls fixed in the aforementioned annular selection by means of a support connected to the movable cylinder by means of a shear element, the housing being connected from above to the packer insert by means of a shear element and provided with a locking ring on the inner surface, while the movable cylinder of the packer in the transport position is connected to hollow stem with shear element.