RU214699U1 - Filter shoe - Google Patents

Abstract

The utility model makes it possible to increase the reliability of the shoe with a filter, increasing its service life by preventing clogging of the inner cavity of the shoe with foreign objects in the drilling fluid, as well as from a large cuttings fraction, while the shoe contains a coupling, a turbine consisting of a stator with side through holes and a rotor with blades, a tip made with through holes, and bearings are additionally equipped with a filter and a hollow body, the coupling is made with the possibility of fixing it on the casing string, the stator is fixed inside the coupling with the possibility of interacting with the rotor blades, the tip is made with the possibility of hydraulic communication with turbine, the filter is a cylindrical filter element provided with a bottom and made with through holes and an annular thickening located with the possibility of fixing the filter inside the stator and forming an annular gap in the filtration zone between the inner surface of the stator and the outer its side surface of the filter, the hollow body is made with the possibility of placing inside it a coupling, a stator with side through holes, a rotor with blades and bearings with internal annular grooves, while the rotor with blades is fixed inside the hollow body with the possibility of rotation, the bearings are installed in the inner annular grooves of the hollow body between the clutch and the hollow body and between the stator and the rotor, the hollow body is connected to the tip with the possibility of joint rotation, while the through side holes are made in the side surface of the stator and arranged in rows with equal spatial pitch, additionally on the outer surface of the hollow body there are ribs , made with the possibility of calibrating an open wellbore during the passage of the shoe, the tip is additionally equipped with hard-alloy cutting tools, the tip is additionally provided with an annular body and cutting elements located around the circumference around the annular body, with one tori attached to the tip. 3 w.p. f-ly, 1 fig.

Description

The utility model relates to the field of construction of oil and gas wells and is intended for working through an uncased wellbore when running a casing string.

A shoe with a power drive is known, containing a clutch, a housing inside which a stator with a rotor and bearings are located and which is connected to the clutch, a tip with through holes, (RF patent No. 170535, E21V 17/14, op. 27.04.2017).

The disadvantage of this technical solution is the lack of protection of the power section of the shoe from the ingress of a large fraction of the cuttings, and foreign objects in the drilling fluid.

The closest technical solution is a column shoe with a hydraulic drive, containing a clutch, a turbine consisting of a stator with side through holes and a rotor with blades, a tip made with through holes, and bearings (RF patent No. 201233, E21V 17/14, op. 12/04/2020, prototype).

The disadvantage of this technical solution is the lack of protection of the turbine section of the shoe from the ingress of coarse cuttings, and foreign objects in the drilling fluid.

The technical result consists in increasing the service life (operating time) of the shoe by preventing clogging of the inner cavity of the shoe, namely, the cavity of the turbine stator, from foreign objects in the drilling fluid, as well as from a large fraction of the cuttings, and, accordingly, to increase reliability filter shoe operation.

The stated technical result is achieved by the fact that the filter shoe contains a clutch, a turbine consisting of a stator with side through holes and a rotor with blades, a tip made with through holes, and bearings, it is additionally equipped with a filter and a hollow housing, the clutch is made with the possibility of fixing its on the casing string, the stator is fixed inside the coupling with the possibility of interacting with the rotor blades, the tip is made with the possibility of hydraulic communication with the turbine, the filter is a cylindrical filter element equipped with a bottom and made with through holes and an annular thickening located with the possibility of fixing the filter inside the stator and formation in the filtration zone of an annular gap between the inner surface of the stator and the outer side surface of the filter, the hollow body is made with the possibility of placing inside it a coupling, a stator with side through holes, a rotor with blades and bearings and with internal annular grooves, while the rotor with blades is fixed inside the hollow body with the possibility of rotation, the bearings are installed in the internal annular grooves of the hollow body between the coupling and the hollow body and between the stator and the rotor, the hollow body is connected to the tip with the possibility of joint rotation, while the through side holes made in the side surface of the stator and arranged in rows with equal spatial pitch, additionally on the outer surface of the hollow body there are ribs made with the possibility of calibrating the open wellbore during the passage of the shoe, the tip is additionally equipped with hard-alloy weapons, the tip is additionally provided with an annular body and cutting elements located along the circumference around the annular body, fixed on the tip on one side.

The figure shows a filter shoe in section.

The filter shoe is made with the possibility of the passage of the working fluid inside it, for example, drilling or cement slurry, getting into the annulus of the casing string.

The filter shoe (hereinafter referred to as the "Shoe") contains a turbine, a coupling 1, a filter 2, a housing 3, a tip 4 and bearings 5 and 6.

A turbine is a device that creates torque and is a multi-row turbine consisting of a rotor 7 and a stator 8.

The stator 8 is made in the form of a glass with side through holes 9, additionally equipped with nozzles. The stator 8 is fixed in the clutch 1 and is located in the hollow body 3.

Through side holes 9 are made in the side surface of the cup 8 and are arranged in rows with equal spatial spacing between them, namely, symmetrically relative to each other in the same plane. A multi-row system of through side holes 9 provides a tangential direction to the incoming flow of the working fluid to the rotor 7 and evenly distributes it, creating the maximum area of useful contact, increasing the efficiency of the turbine and reducing waste energy of the working fluid flow; and also provides balancing of the force of the working fluid flow applied to the rotor 9, minimizing the vibrations that occur during the operation of the shoe.

The rotor 7 is placed in the hollow housing 3 coaxially with the stator 8 and opposite it. Rotor 7 is made in the form of a hollow cylinder, on the inner surface of which blades 10 are located.

For example, the blades 10, made radial, are located with equal axial pitch along the radius and are oriented parallel to the axis of the shoe;

the blades 10 are spirally arranged.

Clutch 1 is made with the possibility of its location inside the hollow body 3, with the possibility of fixing inside it from one end of the stator 8, with the possibility of fixing it on the casing from the opposite end and with the possibility of placing the bearing 5 between the clutch and the hollow body.

The sleeve 1 is made, for example, in the form of a hollow cylinder.

The coupling 1 is connected to the casing and to the stator 8 by means of a threaded connection.

The stator 8 and the clutch 1 can be made in one piece or dismantled.

In the drillable version of the shoe, the stator 8 is made of drillable material.

The hollow body 3 is made in the form of a branch pipe, on the inner surface of which annular grooves are made with the possibility of placing bearings 5 and 6 in them.

The annular grooves are placed with the possibility of installing a rotor 7 between them.

Additionally, on the outer surface of the hollow body 3 there are ribs 11, made with the possibility of calibrating the open wellbore during the passage of the shoe. The ribs 11 function as a stabilizer and can be arranged axially or inclined, for example partially helical. Ribs 11 can be made in one piece with a hollow body 3 or collapsible.

Additionally, the working surfaces of the ribs 11 can be reinforced with hard-alloy teeth and/or a wear-resistant protective cutting coating with hard-alloy chips, minimizing shoe wear in contact with the borehole walls.

The filter 2 is a cylindrical filter element provided with a bottom and made of predetermined dimensions, with through holes and an annular thickening located with the possibility of fixing the filter 2 inside the stator 8 and forming an annular gap in the filtration zone between the inner surface of the stator 8 and the outer side surface of the filter 2 for passage of the filtered working fluid.

For example, the filter 2 is made in the form of a tubular element with a bottom, while the bottom is a plug with holes, an annular thickening is made from the opposite end of the tubular element, and the side surface of the tubular element is made with holes; filter 2 is made in the form of a glass with an annular thickening located in its upper part, and with holes located at the bottom and in the side surface; filter 2 is made in the form of a glass with an annular thickening located in its lower part, and with holes located at the bottom and in the side surface.

The filter 2 is placed and fixed inside the stator 8, located inside and coaxially with the clutch 1, forming in the filtration zone an annular gap between the inner surface of the stator 8 and the outer side surface of the filter 2 due to the annular thickening of the filter 2.

Filter 2 prevents clogging of the cavity of the stator 8 for the period of time of the descent of the Shoe in the form of ingress of a large fraction of sludge and/or foreign objects.

The specified dimensions of the filter 2 are determined based on the condition of ensuring that it is filled with a large fraction of the sludge and/or foreign objects before the Shoe is lowered into the well to a predetermined depth.

The tip 4 is made hollow, with the possibility of connection with the hollow body 3 on one side and a figured shape with through holes on the other side, for example, a figured shape in the form of an eccentric rounding, when the front end of the figured shape of the tip 4 is displaced relative to the axis of the casing,

curly shape in the form of a concentric rounding.

The tip 4 is connected to the hollow body 3 with the possibility of joint rotation by means of a threaded connection.

The through holes of the tip 4 are made to ensure the circulation output of the working fluid from the internal cavity of the housing 3 and are located in a given direction, for example,

in the axial direction

in the radial direction

in axial and radial directions.

The tip 4 provides cutting and calibrating processing of the open wellbore and the direction of OK along the wellbore. Tip 4 is additionally equipped with:

carbide weapons 12 in the form of PDC cutters, carbide teeth or a protective cutting coating with carbide grit, for example, tungsten carbide or vanadium carbide, or combinations thereof, fixed on the outer surface of the tip 4;

an annular body and cutting elements located around the circumference around the annular body, while the annular body is fixed on the tip 4, for example, of a concentric or eccentric element, made of drillable or non-drillable materials, on the one hand, and on the other side is connected to the hollow body 3.

The cutting elements located on the tip 4 perform an additional function, namely the function of working through an open wellbore when lowering the casing string.

The tip 4 provides a given direction of movement of the shoe and casing in the open hole.

For example, the direction of the tubing string in difficult sections of the wellbore can deviate from the axis of the wellbore, especially where the openhole passes through softer, pliable formations. In this case, a tip 4 with a rounded end of a concentric design is used, since with an eccentric design of the rounded end, this problem can be aggravated by the use of a Shoe with an eccentric tip, in which the front end is offset relative to the axis of the column.

Bearings 5 and 6 are installed in the internal annular grooves of the hollow body 3 between the clutch 1 and the hollow body 3 and between the stator 8 and the rotor 7, perceive axial and radial loads transmitted from the tip 4 and the hollow body 3 to the clutch 1, is, for example, multi-row bearing assembly; internal support located on the outer wall of the coupling 1 and external supports located on the inner wall of the hollow body 3.

The radial bearing assembly, which perceives the radial loads transmitted from the tip 4 and the hollow body 3 to the coupling 1, is, for example,

an inner support located on the outer wall of the coupling 1 and an outer support.

The device works as follows.

The shoe is lowered into the well to a predetermined depth.

In the process of its descent, the working fluid is circulated into the shoe at least every, for example, 500 m, along the trunk.

In the process of lowering the shoe, the working fluid through the turbine enters the tip 4 with through holes, causing it to rotate. Further, the working fluid exits through the through holes of the tip 4, partially passing through the bearings 6 and 5, lubricating and cooling them, while the working fluid has the ability to exit between the rotating and non-rotating elements of the shoe.

Rotating tip 4 with through holes works through sections of the wellbore, for example, unstable sections of the wellbore, sections of the wellbore with swelling and collapsing clays, ensuring that the casing string is brought unhindered to a predetermined depth - to the final bottomhole.

In the process of passing, the working fluid enters the turbine through the filter 2, in which foreign objects and large fractions of sludge are retained, thereby preventing the ingress of sludge and / or foreign objects into the internal cavity of the stator 8 with side through holes 9 and clogging the turbine.

Thus, the filter 2 reliably blocks the access of sludge / or foreign objects into the internal cavity of the turbine and, accordingly, the shoe.

After running the casing, when the predetermined depth is reached, a standard cementing procedure is carried out according to the work plan.

The inventive design of the shoe allows

ensure the passage and entry into the annulus of the casing of the working fluid, for example, drilling fluid, cement slurry, or drilling fluid, without clogging the structure,

increase the service life of the shoe, preventing clogging of the inner cavity of the shoe with foreign objects and/or coarse sludge fraction, increasing the reliability of the shoe.

Example.

A shoe in a non-drillable design is lowered into the well to a depth of 3000 m along the wellbore, containing a sleeve 1, made with the possibility of fixing it to the casing, and inside the sleeve 1 a stator 8 is fixed in the form of a glass, in the side surface of which side through holes 9 are made in two rows; hollow body 3 in the form of a hollow cylinder, on the outer surface of which there are four ribs 11, made with the possibility of calibrating an open wellbore during the passage of the shoe.

Inside the hollow cylinder 3, a clutch 1 and three radial bearings 5 and 6 are placed, and the rotor 7 is fixed in the form of a hollow cylinder with radial blades 10. The hollow body 3 is connected to the tip 4 by means of a thread. Two radial bearings 5 are placed in the inner annular grooves of the hollow body 3 between the clutch 1 and the hollow body 3 to the rotor 7. One radial bearing 6 is placed in the inner annular groove of the hollow body 3 between the hollow body 3 and the stator 8 with side through holes 9 under the rotor 7 .

Inside the stator 8 there is a filter 2 in the form of a glass with an annular thickening in its upper part, which provides blocking the access of foreign objects and/or a large fraction of the sludge inside the stator 8, and with holes located at the bottom and in the side surface, ensuring the passage of the filtered working fluid into the annular gap between the inner surface of the stator 8 and the outer side surface of the filter 2 and preventing clogging of the inner cavity of the shoe.

The tip 4 is made hollow and can be connected to the hollow body 3 on one side and shaped with through holes and with a rounded end on the other side, while the rounded end has a concentric design.

The tip 4 is equipped with hard-alloy weapons 12 in the form of PDC cutters fixed on the outer surface of the tip 4.

The working fluid is a flushing fluid.

In the process of descent, the shoe is supplied with circulation of the flushing fluid every 500 meters along the shaft, while the flushing fluid is supplied through the coupling 1, the stator 8 and the rotor 7, the hollow body 3, rotating the tip 4. The flushing fluid partially passes through two radial bearings 6 and 5, lubricating and cooling them, and partially exits between the rotating and non-rotating elements of the shoe. Further, the flushing liquid exits through the through circulation holes of the tip 4.

Rotating tip 4 with through holes works through unstable sections of the wellbore.

The shoe smoothly brings the casing string to the final bottomhole to a depth of 3000 m. Filter 2 ensures the retention of foreign objects and coarse cuttings inside.

The proposed design of the shoe increases the resource of work in the form of an increase in the operating time of the shoe, preventing clogging of the inner cavity of the shoe, namely, the turbine and the tip, with foreign objects and / or a large fraction of the sludge and, accordingly, increases the reliability of the shoe by preventing the destruction of the structural elements of the inner cavity shoes that come into contact with the working fluid.

Claims (4)

1. A shoe containing a clutch, a turbine consisting of a stator with side through holes and a rotor with blades, a tip made with through holes, and bearings, characterized in that it is additionally equipped with a filter and a hollow housing, the clutch is made with the possibility of fixing it on casing string, the stator is fixed inside the sleeve with the possibility of interacting with the rotor blades, the tip is made with the possibility of hydraulic communication with the turbine, the filter is a cylindrical filter element equipped with a bottom and made with through holes and an annular thickening located with the possibility of fixing the filter inside the stator and forming in the filtration zone of the annular gap between the inner surface of the stator and the outer side surface of the filter, the hollow body is made with internal annular grooves and with the possibility of placing a clutch inside it, a stator with side through holes, a rotor with blades, while the rotor with the blades is closed eplen inside the hollow body with the possibility of rotation, the bearings are installed in the internal annular grooves of the hollow body between the coupling and the hollow body and between the stator and the rotor, the hollow body is connected to the tip with the possibility of joint rotation. 2. The shoe according to claim. 1, characterized in that the through side holes are made in the side surface of the stator and are arranged in rows with equal spatial spacing. 3. Shoe according to claim. 1, characterized in that additionally on the outer surface of the hollow body there are ribs made with the possibility of calibrating an open wellbore during the passage of the shoe. 4. Shoe according to claim. 1, characterized in that the tip is additionally equipped with carbide weapons.

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