Screw the engine for cleaning the inner surface of the casing

 

(57) Abstract:

The invention relates to techniques for repair of oil and gas wells, namely, devices for cleaning the inner surface of the casing from cement crusts, scales plaster and wax, which are formed on the inner surface of the casing during operation of the well, and cement plugs in the casing pipe. Screw the engine contains a screw with external helical teeth, a housing with internal helical teeth, the number of ztowhich is greater by one than the number of zinexternal helical teeth of the screw. The axis ABOUT1ABOUT1housing offset from the axis ABOUT2ABOUT2screw on the value of eccentricity E equal to half the radial height h of the teeth. The screw is made the Central channel and outlet openings for the message center channel with a cavity between the teeth of the screw and the teeth of the housing. In the upper part of the screw located on the top of the reference node is executed in the form of a disk with an annular end bearing surface for engagement with the upper end of the supporting surface of the housing. In the lower part of the screw is placed lower reference node in the form of a disk with an annular end-face supporting the vital element, having on the outer surface of diameter Dpthe longitudinal blades. At the upper end of the screw base screw motor inside the casing is made centralizer. Under the action of unbalanced hydraulic forces corps performs a planetary motion relative to the screw. The destructive element of their blades shall, in addition to the cutting action, also arobase-shearing effect on cement crust, deposits of gypsum, wax, etc. by cleaning the inner surface of the casing around the perimeter of its inner section. Improves cleaning. 5 C. p. F.-ly, 9 Il.

The invention relates to techniques for repair of oil and gas wells, namely, devices for cleaning the inner surface of the casing from cement crusts, scales plaster and wax, which are formed on the inner surface of the casing during operation of the well, and cement plugs in the casing pipe. The invention can also be used for cleaning the inner surface of the tubing, drilling and other pipes.

A device for cleaning the inner surface of the casing (see RF patent N 2099507, publ. is undertaken in the housing for axial movement of the spring loaded piston. A device for cleaning the inner surface of the casing provided with a wedge made with the possibility of interaction with the piston. The working surface of the wedge is provided with grooves, second projections of the cutting elements and the angle at the top exceeds the angle of friction between the material and the working surfaces of the wedge and the cutting elements. The specified device is driven by a downhole motor attached to the upper part of the device.

A disadvantage of the known devices for cleaning of the casing is that the destruction of deposits inside the casing with its use is only due to the cutting action of the (scratch) retractable cutting elements. In some cases this is not enough to destroy a particularly strong deposits when the cutting element may not be cutting into the thickness of these deposits due to insufficient force generated by the wedge on the end of the retractable cutting element.

Also known coil motor (see patent USSR N 926209 publ. BI N 17; 07.05.1982, which is used for cleaning the inner surface of the casing. The specified coil motor includes one-piece screw (rotor) with external coil sub of teeth of the screw, and the axis of the housing offset from the axis of the screw on the value of eccentricity equal to half the radial height of the teeth, bearing units and destroying element. Internal helical teeth of the case is made of elastic material such as rubber. The bearings are made in the form of a multi-row ball bearings and radial rubber bearings which are mounted on the shaft associated with the screw through the swivel, and destroying element attached to the lower end of the shaft. Washing fluid passing between the teeth of the screw and the housing, causes the screw in a planetary motion relative to the housing. The planetary movement of the screw through the hinge connection is converted into an axial rotation of the shaft. In practice, as a destructive element, use the chisel, the outer diameter of which is usually made smaller than the inner diameter of the casing string.

A disadvantage of the known screw of the engine for cleaning the inner surface of the casing is that when concentric rotation in the casing destructive element (bit) ignores completely the space between the outer diameter of the bit and the inner surface of casing pipe vsledstvii pipe not completely cleared, there remains a layer of sediments, which bit can't destroy.

The purpose of this invention is to provide a screw of the engine for cleaning the inner surface of the casing, which eliminated the mentioned disadvantages and which provides improved cleaning of the inner surface of the casing due to the fact that the housing together with destructive tool performs a planetary motion of the casing pipe, treating the entire perimeter of the cross-section of the casing.

The problem is solved due to the fact that in the known screw the engine for cleaning the inner surface of the casing including a screw with external helical teeth, a housing with internal helical teeth, the number of which is greater by one than the number of outer helical teeth of the screw and the axis of the housing offset from the axis of the screw on the value of eccentricity equal to half the radial height of the teeth, bearing units and destroying element, according to the invention, the screw is made the Central channel and the outlet openings are located outside the working area of the teeth of the screw and the housing, for the message of the Central channel of the screw with a cavity between the teeth of the screw and the housing, anchor nodes placed at the top is Mimi surfaces of the housing, placed between the disks and the destroying element fixed to the body.

Due to the fact that the outlet of the Central passage in the screw, located outside the working area of the teeth of the screw and the case and inform the Central channel of the screw with a cavity between the teeth of the screw and the housing, the flow of washing fluid enters the lower part of the engine and leads the corps in a planetary motion relative to the screw. When this destructive element, fixed to the body, also makes planetary movement together with the body, objetivas on the inner surface of the casing, and carries in addition to cutting impacts on sediments, covering the inner surface of the casing, and even arobase-shearing effect on these deposits, thereby increasing the cleaning efficiency of casing around the perimeter of their internal section.

Placement of anchor nodes in the upper and lower portions of the screw and execute them in the form of disks with support surfaces for interaction with end support surfaces located between the planetary-moving enclosure to provide a separate perception of the axial loads acting on the hull and associated recrument due to the eccentric application of the axial load directed in the opposite direction with respect to the hydraulic perekashivayutsya the moment ruling on the case, resulting in less distortion of the inner elastomeric teeth of the housing and increasing engine efficiency.

Another difference propeller engines is that the screw is provided with a centralizer outer diameter DCand the outer diameter Dpdestructive element is made based on the ratio of

Dp= DC-2E,

where Dp- outer diameter destructive element;

DC- outer diameter of the centralizer;

E - the eccentricity.

Placing a clamp on the screw and the execution of the specified ratio Diametric size of the centralizer of DCdestroying element of Dpand eccentricity E determines the centering of the upper part of the screw motor inside the casing and parallel to the axes of the motor and casing, thereby providing an ordered planetary motion of the housing relative to the casing. If this ratio is not maintained, then the axis of the housing and the screw will perform a precessional motion, describing a conical surface; the screw will be loaded alternating bending moment, which can lead to damage of the engine.

Another difference screw dillenia cutting with the same number of teeth and eccentricity, the body is made of two parts having internal helical teeth of opposite directions for engagement with the external helical teeth of the upper and lower parts of the screw corresponding directions, the outlet openings of the Central channel of the screw is placed outside the working area of the teeth between the helical teeth of opposite directions, and parts of the body are interconnected.

Execution of external helical teeth in the upper and lower parts of the screw opposite the cutting direction with the same number of teeth and the eccentricity, the embodiment of the casing of two parts, which made internal helical teeth of the respective areas, and placement of the outlet openings of the Central channel of the screw between the helical teeth of opposite directions allows to balance hydraulic thrust loads and hydraulic perekashivayutsya moments that occur on the upper and lower parts of the body, as well as to reduce the axial loads acting on the bearings, due to the perception part of the axial load of the screw teeth of the screw and the housing, in herringbone gearing. This improves the reliability and durability of the screw motor.

IEW the upper part of the case is made larger than the diameter d1on the projections of the external helical teeth of the lower end of the screw.

This difference provides ravnopravnosti screw when exposed to bending loads, and also simplifies the Assembly of the engine, as the upper part of the body passes freely through the lower portion of the screw having the opposite direction of the teeth. If the ratio is not maintained, the motor Assembly is complicated, because the teeth of the upper part of the body will be moved by the teeth of the lower part of the rotor with tightness, which is unacceptable.

A further difference of the screw motor is that the upper and lower parts of the body are interconnected by a coupler having at the ends of the thread opposite direction. This provides the technological capability of the engine Assembly by connecting the parts of the body while screw coupling on the upper and lower parts having threads of opposite direction.

Another difference is that in the clutch made the hole for the connection of the internal cavity of the motor with the internal cavity of the casing. Execution at the coupling holes allows you to provide a jetting effect, contributing to the destruction of the crust and improve domestic cleaning is na surface casing in longitudinal section;

in Fig. 2 shows in enlarged scale a cross section along a-a at the location of the helical teeth of the screw and casing;

in Fig. 3 and 4 show on an enlarged scale view of the anchor nodes, respectively in the upper and lower parts of the screw;

in Fig. 5 shows a cross section in In In in location destructive element;

in Fig. 6 shows a General view of the options for performing screw of the engine for cleaning the inner surface of the casing in longitudinal section;

in Fig. 7 and 8 show cross-sections C-C and D-D respectively at the location of the helical teeth of opposite directions, the cutting of the screw and casing;

in Fig. 9 shows a section along e-E in the location of the coupling connecting the upper and lower part of the body.

Screw the engine for cleaning the inner surface of the casing (Fig. 1, 2) contains the screw 1 with external helical teeth 2, the case 3 with internal helical teeth 4, the number of Ztowhich is greater by one than the number of Zinexternal helical teeth 2 of the screw 1. Internal helical teeth 4 of the housing 3 is made of elastic material, for example of rubber, prevulcanized to the inner surface of the housing 3. Axis O1O1

In the upper part 8 of the screw 1 is the upper reference unit 9 made in the form of a disc 10 with the annular end bearing surface 11 for engagement with the upper end of the supporting surface 12 of the housing 3 (Fig. 3). Bearing surface 11 of disk 10 and the supporting surface 12 of the housing 3 is made conical to ensure traffic rolling these surfaces one on the other with minimal sliding. In the lower part 13 of the screw 1 is placed lower reference node 14 in the form of a disk 15 with the annular end bearing surface 16 for engagement with the lower end of the supporting surface 17 of the housing 3 (Fig. 1, 4). Surfaces 16 and 17 are also made conical. The disk 15 of the lower reference node 14 is attached to the bottom part 13 of the screw 1, for example, by a nut 18. Thus, the housing 3 is placed between the top 9 and the bottom 14 of the reference nodes.

To exit the wash liquid in the upper part of the housing 3 with holes 19.

To the housing 3 attached destructive element 20, having on the outer surface of diameter Dplongitudinal blade 21 (Fig. 1, 5). Razrushayushie igna part of the housing 3. In the destructive element 20 a radial hole 22, which preferably is placed in the recess 23 between the blades 21. On the bottom of the destructive element 20 can be made cutting blades (Fig. not shown).

At the upper end of the screw 1 to screw-based engine within the casing 24 is made centralizer 25 having an outer diameter of DCmoreover , the outer diameter Dpdestructive element 20 is made based on the ratio of

Dp= DC-2E,

where Dp- outer diameter destructive element;

DC- outer diameter of the centralizer,

E - the eccentricity.

At the upper end of the screw 1 has threads 26 for attaching screw the motor to the column tubing (Fig. tubing not shown).

The preferred embodiment of the screw of the engine for cleaning the inner surface of the casing shown in Fig. 6. In the upper part 8 of the screw 1 has external helical teeth 2 of the left direction, and the lower part 13 of the screw 1 has external helical teeth 27 of the right direction, and the number of Zinthe teeth 2 and 27 of the screw 1 equally, as well as their eccentricity E. Corpcast 28 case 3 has an internal helical teeth 4 of the left direction for interaction with external helical teeth 2 of the upper part 8 of the screw 1, and the lower portion 29 of the housing 3 has an internal helical teeth 31 of the right direction to interact with external helical teeth 27 of the bottom part 13 of the screw 1 (Fig. 7, 8). The outlet 6 of the Central channel 5 of the screw 1 is located outside the working area of the spiral teeth 2 and 28 having opposite directions. The clutch 30 connects the top 28 and bottom 29 of the chassis 3, a radial hole 32 for the message the internal cavity of the housing 3 with an internal cavity 33 of casing 24.

The diameter D1on the ledges internal helical teeth 4 of the upper part 29 of the housing 3 is made larger than the diameter d1on the projections of the outer helical teeth 27 of the bottom part 13 of the screw 1 (Fig. 7,8).

The coupler 30 has at the ends of the threads 34 and 35 in opposite directions for connection with the corresponding threads of the top 28 and bottom 29 of the housing parts 3.

In the disk 15 with holes 36, and in the destructive element 20 - hole 37 to exit washing liquid from the bottom of the engine.

The hole 37 is designed to monitor the impact on the internal surface of the casing 24 and improve its treatment.

Screw the engine to clean the inside surface is different pipes (Fig. not shown) of the washing liquid passes through the Central channel 5 and the outlet 6 of the screw 1 into the cavity 7 between the outer helical teeth 2 of the screw 1 and the internal helical teeth 4 of the housing 3 (Fig. 2). Under the action of unbalanced hydraulic forces of the body 3 performs a planetary motion relative to the screw 1, and the axis O1O1case 3 rotates about the axis O2O2screw 1 clockwise, when viewed from above, with angular velocity pand the housing 3 rotates about its own axis O1O1also clockwise with angular velocityRelandRel=p/Ztowhere Ztothe number of helical teeth of the housing. The destructive element 20 coupled to the housing 3, performs a planetary motion with him and pressed against the inner surface of the casing 24 under the action of centrifugal force from the planetary-moving mass of the body 3 and destructive element 20. When the screw 1 is based inside of the casing 24 by clamp 25, and destructive element 20 with its blades 21 in the planetary nature of the motion shall, in addition to the cutting action, also arobase-shearing effect on cement crust, allogrooming section.

The flushing liquid is held between the screw 1 and the housing 3, leaves the engine through the holes 19 of the housing 3 into the space between the engine and the inner surface of the casing 24, through the removal of products of destruction on the surface.

The main feature of the screw motor is that the bearings 9 and 14, between which is placed a casing 3, axial load different directions separately. Hydraulic axial load arising on the housing 3 when the engine and directed from the top down, is passed through the lower bearing surface 17 of the housing 3 on the annular bearing surface 16 of the disk 15 of the lower reference node 14. In this case, since the transmission hydraulic axial load is eccentrically relative to the axis O1O1case 3, this causes the appearance of perekachivayuschih case 3 moment Mpdirection which is opposite to the direction of the hydraulic perekachivayuschih moment Mgacting on the housing 3. Mutual balancing of the moments Mpand Mghas a positive effect on reducing deformation of the inner elastomeric helical teeth 4 of the housing 3 and to improve the efficiency, reliability and durability on the om 9 when rolling the upper end surface 12 of the housing 3 through an annular bearing surface 11 of the upper disk 10, mounted on the screw 1. On the housing 3 also occurs perekachivayuschih moment MP1directed in the opposite direction with respect to the hydraulic perekashivayutsya moment Mgand is their mutual trim, with the consequence of reducing the radial deformation of the teeth 4 of the housing 3.

Screw the engine for cleaning the inner surface of the casing shown in Fig. 6, works as described. The difference is that the flow of drilling fluid flowing through the Central channel 5 and the outlet 6 of the screw 1 into the space between the top 28 and bottom 29 of the housing parts 3, is divided into two parts, one of which goes up and passes between the inner helical teeth 4 of the upper part 28 of the casing 3 and the outer helical teeth 2 of the upper part 8 of the screw 1 (teeth 4 and 2 have left direction), and then out through the openings 19 of the housing 3. The second part of the flow of washing fluid is directed downward and passes between the inner helical teeth 31 of the lower part 29 of the housing 3 and the outer helical teeth 27 of the bottom part 13 of the screw 1 (teeth 31 and 27 have the right direction), and exits the engine through the hole 37 destructive element 20. the Yas, lead case 3 in a planetary motion relative to the screw 1, and the axis O1O1case 3 rotates about the axis O2O2screw 1 clockwise, when viewed from above, with angular velocity p, and the housing 3 rotates about its own axis O1O1also clockwise with angular velocityRelandRel=p/Zto. Thus the top 28 and bottom 29 of the chassis 3 have the same angular speedpdue to the fact that the distribution of the flow into two parts occurs automatically in accordance with working volumes of the upper and lower screw (the screw 1 and case 3).

Due to the opposite directions of flow in the upper and lower parts of the engine, the hydraulic axial force acting on the top 28 and bottom 29 of the housing 3, are directed in opposite directions, mutually balanced. Unbalanced axial load, for example, downhole axial load or force of the weight of the rotating parts of the engine, largely perceived external helical teeth 2 and 27 of the screw 1 and the internal helical teeth 4 and 31 of the housing 3, which are, in fact, herringbone kaszubowski perceived by the teeth of the screw 1 and the housing 3 opposite directions. In addition, mutually balanced hydraulic perekashivayutsya torques acting on the top 8 and the bottom 13 of the chassis 3.

Stepped shape of the screw 1 provides his ravnopravnosti under the action of bending and torsional moments, and also simplifies the Assembly of the engine of the coil pairs in different directions, because the upper part 28 of the casing 3, having internal helical teeth 4 of the left direction, passes freely through the lower part 13 of the screw 1 having external helical teeth 2 of the right direction.

Another part of the flow coming from the outlet openings 6, fall into the hole 32 of the clutch 30, and exits the engine into the internal cavity 33 of the casing 24, through jetting cleaning the inner surface of the casing 24 around the perimeter of its cross section, since the clutch 30 is continuously rotated relative to the casing 24.

Thus, the proposed screw engine allows to increase the efficiency of the process of cleaning the inner surface of the casing due to the implementation of the comprehensive impact (cutting, arobase-shearing and wet) cement crust, deposits of gypsum, wax, etc. around the perimeter of the inner surface is a first screw with external helical teeth, case with internal helical teeth, the number of which is greater by one than the number of outer helical teeth of the screw and the axis of the housing offset from the axis of the screw on the value of eccentricity equal to half the radial height of the teeth, bearing units and destroying element, characterized in that the screw is made the Central channel and the outlet openings are located outside the working area of the teeth of the screw and the housing, for the message of the Central channel of the screw with a cavity between the teeth of the screw and the housing, the anchor nodes placed at the top and bottom of the screw and is made in the form of disks with support surfaces for interaction with end support surfaces of the housing, placed between the disks and the destroying element fixed to the body.

2. Screw the engine under item 1, characterized in that the screw is the centralizer of an external diameter DCand the outer diameter Dpdestructive element is made, based on the ratio of

Dp= DC-2E,

where Dp- outer diameter destructive element;

DC- outer diameter of the centralizer;

E - the eccentricity.

3. Screw the engine under item 1 or 2, characterized in that the outer helical teeth in the upper and ignarus made of two parts, having internal helical teeth of opposite directions for engagement with the external helical teeth of the upper and lower parts of the screw corresponding directions, the outlet openings of the Central channel of the screw is placed outside the working area of the teeth between the helical teeth of opposite directions, and parts of the body are interconnected.

4. Screw the engine under item 3, characterized in that the diameter D1on the ledges internal helical teeth of the upper part of the body is larger than the diameter d1on the projections of the external helical teeth of the lower end of the screw.

5. Screw the engine under item 3 or 4, characterized in that the upper and lower housings are connected by a coupler having at the ends of the thread opposite direction.

6. Screw the motor on one of the PP. 3-5, characterized in that the coupling is made the hole for the connection of the internal cavity of the engine and the internal cavity of the casing.

 

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FIELD: oil and gas industry.

SUBSTANCE: device has hollow body with through ports along whole length, axes of which are displaced relatively to one another along spiral. Scraping elements in form of separate resilient brushes are mounted in through ports on basis of condition of providing for cleaning by working surfaces - ends of separate resilient brushes and free exit of removed deposits between brushes and hollow body. Separate resilient brushes are in form of bushings with pressed in bunches of steel wires, which are mounted in through ports with overlapping of each other and possible overlapping by working surfaces - ends of separate resilient brushes of whole inner perimeter of cleaned pipe. Bushings with pressed in bunches of wires are made enlarged in size according to inner diameter of cleaned pipe in accordance to yielding condition of separate brushes material. Spiral coiling angle is 180 degrees.

EFFECT: higher efficiency.

4 dwg, 1 ex

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