RU2311524C1 - Device for well fluid cleaning of floating rubbish - Google Patents

Abstract

FIELD: oil and gas production, particularly bailers and valve drill bits, namely equipment for well fluid cleaning of rubbish occurring in well during technological operations or of mud accumulated at well face.

SUBSTANCE: device comprises tubular body with connection threads at ends thereof and is provided with two rubbish accumulation means having the same funnel-shaped structures and connected to the body by means of screws. Upper rubbish accumulation means have geometric size exceeding that of lower one. Rubbish traps are installed inside rubbish accumulation means and spaced therefrom. The rubbish traps have the same shapes as rubbish accumulation means and are connected to the body by means of screws so that rubbish trap bottoms face upwards. Check valve seat is installed in lower rubbish trap area inside body. Check valve seat has tubular fine filter spaced from body. Body has filtering orifices communicating rubbish trap interiors with each other and orifices, which communicate body interior with tubular annulus for liquid discharge from rubbish traps and from body interior during device lifting to ground surface. Outer rubbish trap surfaces have wing-shaped flow swirling members. Upper connection thread of the body has connection member to secure means, which delivers the device into well.

EFFECT: increased fluid cleaning efficiency and decreased cleaning time.

2 cl, 1 dwg

Description

The invention relates to the oil industry and will find application in cleaning well fluid mainly from floating debris that has fallen into the well during tripping of a pipe string during various technological operations or sludge accumulated at the bottom.

A device is known for cleaning a well from sludge (see patent RU No. 2256769, IPC EV 37/02, EV 21/00, BB 9/04, published in BI No. 20, 07/20/2005 under the name "Sludge collector"), comprising a tubular body with a removable base and a tip with holes, while the removable base is equipped with a sludge accumulator made tubular and mounted concentrically relative to the body. The upper part of the sludge accumulator is equipped with a sludge collector made in the form of a funnel, under which openings are made in the wall for the passage of fluid into the annulus.

A disadvantage of the known device is its low efficiency. This is explained by the fact that with direct liquid circulation, larger parts of the sludge will settle in the sludge collector, and a significant part, not removed to the surface, which remained in a floating state in the annulus, through the openings of the sludge accumulator is again carried to the bottom. Thus, to clean the bottom of the sludge, it is necessary to carry out additional tripping operations, which is associated with a large investment of time. In addition, the cleaning process requires the involvement of a large number of technological vehicles and equipment, a working team.

Also known is a device for cleaning a well of all kinds of dirt, scaling including sludge (see patent RU No. 2189432, IPC 7 ЕВВ 37/02, published in BI No. 26, 09/20/2002), containing a tubular body, including a tubular body with connecting threads at the ends, a garbage collector mounted on it, made in the form of a funnel with a conditional outer diameter smaller than the diameter of the well, and a check valve. The device also contains a node for cleaning the walls of the well in the interval of its filter from adhering to there pollutants.

The known device in its technical essence is closer to the claimed one and can be adopted as a prototype.

Its disadvantage, as well as its analogue, is the high time costs associated with hoisting operations. In addition, it is not effective in cleaning well fluid from floating debris. As well as the analogue, it causes a number of inconveniences for the service team due to the fact that when it is raised to the surface along with the substances that pollute the well and the cuttings, a lot of well fluid is present in the cuttings accumulator, and drainage is not provided for when lifting it.

An object of the present invention is to increase efficiency and reduce the time spent.

The problem is solved by the described device, including a tubular body with connecting threads at the ends, a garbage collector mounted on it, made in the form of a funnel with a conditional outer diameter smaller than the diameter of the well, and a check valve.

New is the fact that the waste bin is equipped with a waste bin located inside it with a gap and made in the form of a funnel, with the bottom facing up and fixed to the housing with screws, the outer surface of the bin is equipped with flow guides made in the form of wings, and to the bottom of the non-return valve seat a tubular fine filter for liquid purification is fixed, installed with a gap relative to the housing, the cavity of the garbage collector communicating with the mentioned clearance through the filtering openings of the housing, while above an additional waste bin of a similar design as that of the aforementioned waste bin is installed in size with a large waste receptacle on the housing, the upper connecting thread of the housing having an element for attaching the device delivery means to the well.

Also new is the fact that the waste bin is made of elastomeric material, and the delivery vehicle is in the form of a rope.

The drawing explains the essence of the invention, which shows the proposed device in a partial longitudinal section.

The device comprises a tubular body 1 with connecting threads 2 and 3 at the ends for the fastening element 4 for delivering the device to the well, made in the form of a rope 5, and for the shoe 6 with holes 7 communicating the annular space with the annular. The housing is equipped with two waste bins 8 and 9 of the same design, made in the form of a funnel of elastomeric material, the upper parts of which are made in the form of a cylinder 10 and 11, respectively. The waste bins are mounted on the stops 12 and 13, fixed to the body with screws 14 and 15. The upper waste bin 8 is geometrically larger than the downstream waste bin 9, but smaller than the diameter of the well casing 16.

Inside the garbage collectors within cylindrical parts with a gap, garbage collectors 17 and 18 are installed, fixed to the housing with screws, made in shape similar to garbage collectors with the bottom facing up. In the area of the lower garbage collector 18 inside the housing 1, a check valve 19 seat 19 is installed, fixed to it with screws 21 with a thin filter tubular 22 installed with a gap relative to the housing.

Filtration openings 23, 24, communicating the cavity of the waste bins 8 and 9, as well as openings 25, 26, communicating the cavity of the casing with the annulus 27 for draining liquid from the waste bins, as well as from the cavity of the housing during lifting the device to the surface, are made in the housing. The outer surfaces of the waste bins are equipped with flow spreaders 28 and 29, made in the form of wings.

The device operates as follows. It is lowered into the well in assembled form, as shown in the drawing, attaching it to the rope 5, under the static level of the liquid, having previously installed a grid inside the shoe. When the lower waste bin 9 enters the liquid, part of the floating debris instantly fills its cavity and is held there by the trash bin 18.

Similarly, according to the above-described scheme, the upper garbage bin 8 is filled with garbage when it reaches a liquid level that has slipped past the lower garbage collector 9. At the same time, the passage of undetected floating garbage by the lower garbage collector through the gap 27 between the borehole wall and the upper garbage collector is facilitated by flow distributors 28 and 29. Then the device is lifted to surface for emptying garbage containers from floating debris. In the process of lifting the device to the surface, the liquid that has got into the body and waste bins along with the debris through the filter holes 23, 24, 25 and 26 is drained back into the well. At the same time, small particles of garbage separated in the form of sand and sludge separated from the floating debris and trapped through the filter openings 23 and 24 are blocked by the check valve 20, and in the lower part of the casing inside the shoe 6 by its mesh (not shown). If necessary, the operation to clean the well fluid from floating debris is repeated.

The device can also be used to clean the bottom of the accumulated sludge. To do this, the device is subjected to a reciprocating movement down and up several times, after which the device is raised to the surface. In case of severe contamination of the bottom with slurry, the cleaning operation is repeated.

Cleaning the bottom of the accumulated sludge can be combined with the treatment of the bottom-hole zone of the reservoir. For this, the fastening element 4 is unscrewed from the housing and then the device is lowered onto the tubing string (tubing) by connecting it to it using a sleeve or sub (the tubing string and sleeve are not shown due to simplicity). At the same time, during the treatment of the formation and the operation of accumulating sludge in the garbage container, the device is lowered without valve 20, dropping it from the surface only before starting to remove the device from the well. Moreover, the operation of accumulation of sludge in the garbage can be carried out by creating a direct circulation of the liquid, passing it through the hole 7 of the shoe 6 of the device.

In addition, the device can be lowered into the well and in the layout of the underground pump as a sand filter, attaching it to the bottom of the pumping equipment.

Thus, as can be seen from the above, the device proposed for protection by a security document has a multifunctional purpose. As you know, floating debris in the well fluid, as well as sand coming from the formation along with the products, cause a lot of trouble to oil workers. In the first case, floating debris prevents the echo sounder from accurately measuring the static or dynamic level of the well fluid due to the lack of a reflected signal, and the ingress of sand into the pumping equipment leads to failure of its operation due to failure of its valve assembly.

The technical and economic advantage of the proposal is as follows.

Its use reduces the time required by multiple and more times. It has an increased efficiency of cleaning well fluid from floating debris, as well as sludge accumulated at the bottom, and has a multifunctional purpose.

Claims (2)

1. A device for cleaning downhole fluid from floating debris, including a tubular body with connecting threads at the ends, a waste bin mounted on it, made in the form of a funnel with a conditional outer diameter smaller than the borehole diameter, and a check valve, characterized in that the waste bin is provided a garbage collector placed inside it with a gap and made in the form of a funnel, with the bottom facing up and fixed to the housing with screws, the outer surface of the garbage container is equipped with flow spreaders, wing-shaped, and to the lower part of the seat of the non-return valve there is fixed a tubular liquid fine filter installed with a gap relative to the casing, the cavity of the garbage collector communicating with the said gap through the filtering openings of the casing, and a large additional garbage can of similar size is installed over the garbage can on the casing design, as in the aforementioned waste bin, the upper connecting thread of the housing provided with an element for attaching a means of delivery of devices and into the well. 2. The device according to claim 1, characterized in that the waste bin is made of elastomeric material, and the delivery vehicle is in the form of a rope.