JP6558112B2 - Steel pipe cleaning equipment - Google Patents

Description

  The present invention relates to a steel pipe cleaning apparatus having an end portion that becomes a threaded joint, and more particularly to a cleaning apparatus suitable for cleaning an end face of a steel pipe.

  For example, in oil wells, natural gas wells, and the like (hereinafter also collectively referred to as “oil wells”), steel pipes called OCTG (Oil Country Tubular Goods) are used to mine underground resources. The steel pipes are sequentially connected and a threaded joint is used for the connection.

  The types of threaded joints for steel pipes are roughly divided into coupling types and integral types. In the case of a coupling type threaded joint, the steel pipes are connected to each other via a coupling. In this case, a male screw is provided on the outer periphery of both ends of the steel pipe, and a female screw is provided on the inner periphery of both ends of the coupling. In the case of an integral type threaded joint, the steel pipes are directly connected to each other. In this case, a male screw is provided on the outer periphery of one end of the steel pipe, and a female screw is provided on the inner periphery of the other end.

  Generally, a joint portion including a pipe end portion provided with a male screw is referred to as a pin because it includes an element inserted into the female screw. On the other hand, the joint portion including the pipe end portion provided with the internal thread is referred to as a box because it includes an element for receiving the external thread.

  Steel pipe thread joints are required to have high sealing performance. Therefore, in many cases, the threaded joint includes a metal seal formed by contact between seal surfaces in addition to a screw seal formed by fitting a male screw and a female screw. In such a threaded joint, a liquid lubricant with high lubricity called a grease compound is applied to a pipe end including a threaded portion (male thread, female thread), a seal surface, and the vicinity thereof when fastening steel pipes. Is done. This is to prevent the occurrence of seizure.

  In recent years, environmental regulations have become stricter. Therefore, instead of using the grease compound, a solid lubricating layer (hereinafter also simply referred to as “lubricating layer”) such as plating or resin is formed at the pipe end. At that time, before the process of forming the lubricating layer, or before the process of forming the base as the pretreatment of the lubricating layer forming process (eg, the process of forming the zinc phosphate coating), the tube end is washed with a cleaning liquid. Washed. This is because foreign matters such as chips and cutting oil generated by the thread cutting process are attached to the pipe end portion, so that these foreign matters are removed. And after washing | cleaning, after a pipe end part is dried, a lubrication layer formation process or a foundation | substrate process is performed to a pipe end part. If the pipe end is not cleaned, foreign matter is mixed into the lubricating layer, and the sealing performance of the threaded joint deteriorates.

  For example, Japanese Utility Model Laid-Open No. 1-124282 (Patent Document 1), Japanese Utility Model Laid-Open No. 6-11881 (Patent Document 2) and International Publication No. WO2013 / 038485 (Patent Document 3) disclose conventional pipe end cleaning devices. Is disclosed. These cleaning devices clean the threaded portion (male thread) from the outer peripheral side of the tube end by pressing the brush, spraying the cleaning liquid, or the like.

  Here, in an actual steel pipe, the end surface of the pipe end portion (pin) that becomes a threaded joint is often a shoulder surface. The shoulder surface serves as a stopper that limits the screwing of the pin into the box. Further, the shoulder surface plays a role of giving a so-called screw tightening axial force to the load surface of the screw portion in a state where the fastening is completed.

  The solid lubricating layer is formed not only on the threaded portion, the seal surface and the vicinity thereof provided on the outer periphery of the tube end portion, but also on the shoulder surface that is the end surface of the tube end portion. Furthermore, a lubricating layer may be formed on the inner periphery of the pipe end. Even in these parts, it is required that no foreign matter is mixed into the lubricating layer. In particular, the property of the shoulder surface affects the sealing performance of the threaded joint, and therefore foreign matter should be prevented from entering the lubricating layer on the shoulder surface.

  However, all of the cleaning devices described in Patent Documents 1 to 3 clean the threaded portion (male thread) from the outer peripheral side of the tube end portion. Therefore, the end surface (shoulder surface) of the steel pipe cannot be cleaned.

Japanese Utility Model Publication No. 1-124282 Japanese Utility Model Publication No. 6-11881 International Publication WO2013 / 038485

The object of the present invention is to provide a steel pipe cleaning device having the following characteristics:
The end face of a steel pipe having an end that becomes a screw joint can be cleaned.

  A steel pipe cleaning device according to an embodiment of the present invention is a steel pipe cleaning device provided with a screw at an end, and includes a first brush, a first nozzle, a guide roller, a first cleaning head, and a rotation mechanism. And comprising. The first brush is pressed against a partial region in the circumferential direction in the region of the end surface of the steel pipe. The first nozzle supplies a cleaning liquid to the first brush. The guide roller is pressed against the end surface of the steel pipe. The first cleaning head supports the first brush, the first nozzle, and the guide roller. The rotation mechanism rotates the steel pipe or the first cleaning head around the axis of the steel pipe.

  Said washing | cleaning apparatus can be set as the structure provided with a pair of support roller which supports the said steel pipe and rotates the said steel pipe around an axis | shaft as said rotation mechanism.

  In the above cleaning apparatus, the guide roller is divided into two in its axial direction, and each of the divided guide rollers presses against a partial region in the circumferential direction of the region of the end surface of the steel pipe. It is preferred that

  In the cleaning apparatus, it is preferable that the position of the guide roller attached to the first cleaning head is variable in a direction perpendicular to the axial direction of the guide roller.

  In the cleaning apparatus, it is preferable that the direction of the first brush with respect to the end surface of the steel pipe is variable.

  The cleaning device further includes a second brush pressed against a partial region in the circumferential direction of the outer peripheral region of the end of the steel pipe, and a second nozzle that supplies a cleaning liquid to the second brush. And a second cleaning head that supports the second brush and the second nozzle.

The steel pipe cleaning apparatus of the present invention has the following remarkable effects:
The end face of a steel pipe having an end that becomes a screw joint can be cleaned.

FIG. 1 is a side view schematically showing a configuration of a cleaning apparatus common to the respective embodiments. FIG. 2 is a front view schematically showing the configuration of the first cleaning head in the cleaning apparatus of the first embodiment. FIG. 3 is a front view schematically showing the configuration of the first cleaning head in the cleaning device of the second embodiment. FIG. 4 is a front view schematically showing the configuration of the first cleaning head in the cleaning apparatus of the third embodiment. FIG. 5 is a side view schematically showing the configuration of the first cleaning head in the cleaning apparatus of the third embodiment.

  Hereinafter, a steel pipe cleaning apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a side view schematically showing a configuration of a cleaning apparatus common to the respective embodiments. FIG. 2 is a front view schematically showing the configuration of the first cleaning head in the cleaning apparatus of the first embodiment. As shown in FIG. 1, the cleaning device 1 includes a first cleaning head 10 and a second cleaning head 20 in order to clean the end portion Pa of the steel pipe P. On the outer periphery Pb of the end portion Pa of the steel pipe P, a male screw and a seal surface are provided. The end surface Pc of the tube end portion Pa is a shoulder surface. The first cleaning head 10 is used for cleaning the end surface Pc of the tube end portion Pa. The second cleaning head 20 is used for cleaning the male screw and the sealing surface provided on the outer periphery Pb of the pipe end portion Pa.

  As shown in FIG. 2, the steel pipe P is supported in a horizontal posture by a pair of support rollers 2A and 2B on the left and right. One support roller 2A is a drive roller, and is connected to a power source (not shown) such as a motor. The other support roller 2B is a driven roller. When the power from the power source is transmitted to the support roller 2A which is a driving roller, the support roller 2A rotates around its own axis. The support roller 2B, which is a driven roller, rotates around its own axis in conjunction with the rotation of the support roller 2A, which is a drive roller. The rotation directions of the pair of support rollers 2A and 2B are the same. The steel pipe P rotates about its own axis by the rotation of the support rollers 2A and 2B.

  The first cleaning head 10 is disposed so as to face the end surface Pc of the tube end portion Pa. The second cleaning head 20 is disposed so as to face the outer periphery Pb of the tube end portion Pa from above the tube end portion Pa. The first cleaning head 10 and the second cleaning head 20 are supported by the frame 4 rising from the gantry 3. Specifically, the first cleaning head 10 is fixed to the frame 4. On the other hand, the second cleaning head 20 is supported by the frame 4 so as to be movable in the vertical direction. That is, the height of the second cleaning head 20 is variable. In the present embodiment, the gantry 3 can move back and forth along the axial direction of the steel pipe P and the support rollers 2A and 2B.

  A tray 5 is installed on the gantry 3. The receiving tray 5 receives the cleaning liquid used for cleaning the tube end portion Pa. A tank 6 is placed below the tray 5. The cleaning liquid in the tray 5 is guided to the tank 6 through the discharge pipe 5 a from the tray 5. The cleaning liquid in the tank 6 is sent out to the first cleaning head 10 and the second cleaning head 20 through the pipe 7 from the tank 6. The cleaning liquid is sent out to each of the cleaning heads 10 and 20 by a pump 8 disposed in the path of the pipe 7. A strainer (not shown) is disposed in the pipe 7 between the tank 6 and the pump 8.

  The first cleaning head 10 supports the first brush 11, the first nozzle 15, and the guide roller 16. The 1st brush 11 is arrange | positioned so that the lowermost area | region of the area | regions of the end surface Pc of the pipe end part Pa may be opposed. The first brush 11 includes a hair material 11a and a brush body 11b in which the hair material 11a is implanted. The brush main body 11 b is fixed to the first brush holding member 12 by a bolt 13. The 1st brush holding member 12 has the spindle 12a which protrudes in the left-right direction. Each support shaft 12 a of the first brush holding member 12 is rotatably supported by a pair of side plates 10 a protruding from the first cleaning head 10. Thereby, the direction of the 1st brush 11 (hair material 11a) with respect to the end surface Pc of the pipe end part Pa becomes variable. The orientation of the first brush 11 is adjusted by the screwing amounts of the bolts 14 </ b> A and 14 </ b> B installed on the back side of the first brush holding member 12. Note that only the first brush 11 can be easily replaced by loosening the bolt 13.

  The first nozzle 15 penetrates the first brush holding member 12 and the brush body 11b of the first brush 11 from the back side, and opens toward the bristle material 11a of the first brush 11. A pipe 7 from the tank 6 is connected to the first nozzle 15. The 1st nozzle 15 ejects the washing | cleaning liquid sent out from the tank 6 through the piping 7, and supplies a washing | cleaning liquid to the 1st brush 11 (hair material 11a).

  The guide roller 16 is disposed above the first brush 11. In particular, in the present embodiment, the guide roller 16 is disposed in a horizontal posture at a position substantially the same height as the axis of the steel pipe P. Furthermore, the guide roller 16 is divided into two in its own axial direction. Each of the divided guide rollers 16A and 16B is disposed so as to face the left and right side regions of the end surface Pc of the tube end portion Pa. Each guide roller 16A and 16B includes a stepped roller shaft 17 penetrating both, and is rotatable about the roller shaft 17. Both end portions of the roller shaft 17 pass through a pair of side plates 10 b protruding from the first cleaning head 10, and are fixed to the side plates 10 b by nuts 18. The material of the guide roller 16 is engineering plastic having both moderate elasticity (softness) and rigidity (hardness) and excellent durability, such as MC nylon (registered trademark) and urethane rubber.

  The second cleaning head 20 supports the second brush 21 and the second nozzle 25. The second brush 21 is disposed so as to face the second brush 21. Similar to the first brush 11, the second brush 21 includes a bristle material 21a and a brush body 21b. The brush body 21 b is fixed to the second brush holding member 22 by a bolt 23. The 2nd brush holding member 22 has the spindle 22a which protrudes in the left-right direction. Each support shaft 22 a of the second brush holding member 22 is rotatably supported by a pair of side plates 20 a protruding from the second cleaning head 20. Thereby, the direction of the 2nd brush 21 (hair material 21a) with respect to the outer periphery Pb of the pipe end part Pa becomes variable. The orientation of the second brush 21 is adjusted by the screwing amounts of the bolts 24A and 24B, similarly to the first brush 11. Note that only the second brush 21 can be easily replaced by loosening the bolt 23.

  The second nozzle 25 penetrates the second brush holding member 22 and the brush body 21b of the second brush 21 from the back side and opens toward the bristle material 21a of the second brush 21. A pipe 7 from the tank 6 is connected to the second nozzle 25. The 2nd nozzle 25 spouts the washing | cleaning liquid sent out from the tank 6 through the piping 7, and supplies a washing | cleaning liquid to the 2nd brush 21 (hair material 21a).

  Cleaning of the steel pipe P using such a cleaning apparatus 1 is performed as follows. The steel pipe P is placed on the support rollers 2A and 2B. Thereafter, as shown in FIG. 1, the gantry 3 moves until the guide roller 16 contacts the end portion Pa of the steel pipe P. As a result, the guide roller 16 is pressed against the end surface Pc of the pipe end portion Pa. The first brush 11 (strictly, the hair material 11a) is pressed against the lowermost region of the region of the end surface Pc of the tube end portion Pa. Furthermore, the 2nd brush 21 (strictly hair material 21a) will be in the state pressed against the uppermost area | region among the area | regions of the outer periphery Pb of the pipe end part Pa.

  In this state, the pump 8 is driven. Then, the cleaning liquid is supplied from the first nozzle 15 to the first brush 11. A cleaning liquid is supplied from the second nozzle 25 to the second brush 21. Then, the support rollers 2A and 2B are driven to rotate the steel pipe P. Thereby, the region of the end surface Pc of the tube end portion Pa is cleaned over the entire area in the circumferential direction by sliding with the first brush 11 while being supplied with the cleaning liquid. The region of the outer periphery Pb of the tube end portion Pa is cleaned over the entire area in the circumferential direction by sliding with the second brush 21 while being supplied with the cleaning liquid.

  At this time, since the guide rollers 16A and 16B are in contact with the end surface Pc of the tube end portion Pa, the position of the end surface Pc of the tube end portion Pa is maintained constant. Thereby, the contact state of the 1st brush 11 and the end surface Pc of the pipe end part Pa is stabilized, and the contact state of the 2nd brush 21 and the outer periphery Pb of the pipe end part Pa is also stabilized. As a result, the end surface Pc of the tube end portion Pa, that is, the shoulder surface is uniformly and sufficiently cleaned by the first brush 11. The outer periphery Pb of the pipe end portion Pa, that is, the male screw and the sealing surface are uniformly and sufficiently cleaned by the second brush 21. Therefore, according to the cleaning apparatus 1 of the present embodiment, the end surface Pc of the steel pipe P having the end portion Pa serving as a threaded joint can be cleaned. Moreover, the outer periphery Pb of the tube end Pa can be cleaned.

  Further, each of the guide rollers 16A and 16B in contact with the end surface Pc of the tube end portion Pa follows the rotation of the end surface Pc and smoothly rotates around the roller shaft 17. That is, the guide rollers 16A and 16B do not rub against the end surface Pc of the tube end portion Pa. If it does so, the scraping resulting from each guide roller 16A and 16B will not arise in the end surface Pc of the pipe end part Pa, ie, a shoulder surface.

  Moreover, if the direction of the 1st brush 11 (hair material 11a) is adjusted, the inner periphery of pipe | tube edge part Pa can also be wash | cleaned.

[Second Embodiment]
FIG. 3 is a front view schematically showing the configuration of the first cleaning head in the cleaning device of the second embodiment. The cleaning apparatus of the second embodiment is based on the configuration of the cleaning apparatus of the first embodiment, and a part of the configuration is modified.

  Generally, the outer diameter size of a steel pipe is various. In this regard, as shown in FIG. 2, in the cleaning apparatus 1 of the first embodiment, the lengths of the guide rollers 16A and 16B in the first cleaning head 10 are short. Therefore, when cleaning is performed using the common first cleaning head 10 (particularly, the guide roller 16), the outer diameter size of the steel pipe P that can be handled is significantly limited. Further, if the first cleaning head 10 (particularly the guide roller 16) is prepared for each outer diameter size of the steel pipe P, the manufacturing cost of the first cleaning head 10 increases.

  Therefore, in the cleaning device of the second embodiment, as shown in FIG. 3, the lengths of the guide rollers 16A and 16B in the first cleaning head 10 are significantly longer than those of the first embodiment. Thereby, when washing | cleaning the steel pipe P from which outer diameter size differs, each guide roller 16A and 16B comes to contact the one part area | region of the circumferential direction among the area | regions of the end surface Pc of the pipe end part Pa. Therefore, the end face Pc of the steel pipe P having a different outer diameter size can be cleaned using the common first cleaning head 10.

  Here, the shaft diameter of the stepped roller shaft 17 that rotatably supports the guide rollers 16A and 16B is small in the region of the guide rollers 16A and 16B. Therefore, if the lengths of the guide rollers 16A and 16B are too long, the strength of the roller shaft 17 may decrease, and the roller shaft 17 may break. In consideration of such a situation, for example, when cleaning a small-medium-diameter steel pipe P having an outer diameter size of 177.8 mm to 219.1 mm, a common small first cleaning head 10 may be used. When cleaning the steel pipe P having an outer diameter of 244.48 mm to 355.6 mm having a medium and large diameter, a common large first cleaning head 10 may be used.

  In addition, when wash | cleaning the steel pipe P from which an outer diameter size differs, the outer periphery Pb of pipe end part Pa can be wash | cleaned by adjusting the height of the 2nd washing head 20. FIG.

[Third Embodiment]
FIG. 4 is a front view schematically showing the configuration of the first cleaning head in the cleaning apparatus of the third embodiment. FIG. 5 is a side view schematically showing the configuration of the first cleaning head. The cleaning device of the third embodiment is based on the configuration of the cleaning device of the second embodiment, and a part of the configuration is modified.

  As shown in FIG. 3, in the cleaning apparatus 1 of the second embodiment, when cleaning the steel pipe P having different outer diameter sizes, the guide rollers 16A and 16B in the first cleaning head 10 are end faces of the pipe end portion Pa. A part of the circumferential direction in the Pc region comes into contact. However, depending on the outer diameter size of the steel pipe P, each of the guide rollers 16A and 16B may be arranged at a position that is greatly deviated from the axis of the steel pipe P. In this case, the rotation direction (circumferential direction) of the guide rollers 16A and 16B and the rotation direction of the end surface Pc of the tube end Pa in contact with the guide rollers 16A and 16B are greatly deviated. Therefore, the guide rollers 16A and 16B are difficult to follow the rotation of the end surface Pc of the pipe end portion Pa and are difficult to rotate. That is, the guide rollers 16A and 16B and the end surface Pc of the pipe end portion Pa rub against each other. If it does so, the scraping resulting from each guide roller 16A and 16B may arise in the end surface Pc of the pipe end part Pa, ie, a shoulder surface.

  Therefore, in the cleaning device of the third embodiment, as shown in FIGS. 4 and 5, the positions of the guide rollers 16A and 16B attached to the first cleaning head 10 are variable in the vertical direction. That is, the mounting position of each guide roller 16A and 16B is variable in a direction perpendicular to the axial direction of the guide roller 16. Specifically, a long hole 10c is formed in the pair of side plates 10b protruding from the first cleaning head 10 along the vertical direction. Both end portions of the roller shaft 17 are inserted into the long holes 10c of the side plates 10b and fixed to the side plates 10b by nuts 18.

  According to such a configuration, according to the outer diameter size of the steel pipe P, each guide roller 16A and 16B can be arranged at a position substantially the same height as the axis of the steel pipe P. This is because the adjustment of the height position of the roller shaft 17 is allowed within the range of the long hole 10c. Thereby, even when the steel pipes P having different outer diameter sizes are washed, the guide rollers 16A and 16B that are in contact with the end face Pc of the pipe end portion Pa follow the rotation of the end face Pc, respectively. Smoothly rotates around 17. Therefore, the end face Pc of the steel pipe P having a different outer diameter size can be cleaned with high quality by using the common first cleaning head 10.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, at the time of cleaning, the guide roller 16 is first brought close to the steel pipe P. On the contrary, the structure which makes the steel pipe P approach the guide roller 16 may be sufficient. In the case of this configuration, the gantry 3 is deferred without moving forward and backward.

  Moreover, in said embodiment, the 1st washing | cleaning head 10 is fixed as a rotation mechanism in the case of washing | cleaning, and it is the structure which the steel pipe P rotates around an own axis. On the contrary, the steel pipe P may be fixed without rotating, and the first cleaning head 10 may rotate around the axis of the steel pipe P. In the case of this configuration, the support rollers 2A and 2B only support the steel pipe P.

  The position of the first brush 11 is not particularly limited as long as it is a partial region in the circumferential direction in the region of the end surface Pc of the steel pipe P.

  The cleaning apparatus of the present invention is useful for cleaning any steel pipe having an end portion to be a screw joint, including a steel pipe used for an oil well pipe.

1: Cleaning device, 2A, 2B: Support roller, 3: Base,
4: frame, 5: saucer, 5a: discharge pipe,
6: Tank, 7: Piping, 8: Pump,
10: first cleaning head, 10a: side plate, 10b: side plate,
10c: slotted hole,
11: 1st brush, 11a: Hair material, 11b: Brush body,
12: 1st brush holding member, 12a: A spindle,
13: Bolt, 14A, 14B: Bolt,
15: first nozzle,
16, 16A, 16B: guide roller, 17: roller shaft,
18: Nut,
20: Second cleaning head, 20a: Side plate,
21: 2nd brush, 21a: Hair material, 21b: Brush body,
22: 2nd brush holding member, 22a: A spindle,
23: Bolt, 24A, 24B: Bolt,
25: Second nozzle,
P: steel pipe, Pa: end, Pb: outer periphery, Pc: end face

Claims (6)

A steel pipe cleaning device having a screw at its end ,
A first brush pressed against a partial region in the circumferential direction of the region of the end surface of the steel pipe;
A first nozzle for supplying a cleaning liquid to the first brush;
A guide roller pressed against the end surface of the steel pipe;
A first cleaning head that supports the first brush, the first nozzle, and the guide roller;
A rotation mechanism for rotating the steel pipe or the first cleaning head around the axis of the steel pipe,
A steel pipe cleaning apparatus comprising a pair of support rollers that support the steel pipe and rotate the steel pipe about an axis as the rotation mechanism. A steel pipe cleaning device having a screw at its end ,
A first brush pressed against a partial region in the circumferential direction of the region of the end surface of the steel pipe;
A first nozzle for supplying a cleaning liquid to the first brush;
A guide roller pressed against the end surface of the steel pipe;
A first cleaning head that supports the first brush, the first nozzle, and the guide roller;
A rotation mechanism for rotating the steel pipe or the first cleaning head around the axis of the steel pipe,
The steel pipe cleaning device, wherein the guide roller is divided into two in its own axial direction, and each of the divided guide rollers is pressed against a part of the circumferential direction in the region of the end surface of the steel pipe. . A steel pipe cleaning device according to claim 2,
A steel pipe cleaning apparatus, wherein a position of the guide roller attached to the first cleaning head is variable in a direction perpendicular to an axial direction of the guide roller. A steel pipe cleaning device having a screw at its end ,
A first brush pressed against a partial region in the circumferential direction of the region of the end surface of the steel pipe;
A first nozzle for supplying a cleaning liquid to the first brush;
A guide roller pressed against the end surface of the steel pipe;
A first cleaning head that supports the first brush, the first nozzle, and the guide roller;
A rotation mechanism for rotating the steel pipe or the first cleaning head around the axis of the steel pipe,
A steel pipe cleaning apparatus, wherein a position of the guide roller attached to the first cleaning head is variable in a direction perpendicular to an axial direction of the guide roller. A steel pipe cleaning device having a screw at its end ,
A first brush pressed against a partial region in the circumferential direction of the region of the end surface of the steel pipe;
A first nozzle for supplying a cleaning liquid to the first brush;
A guide roller pressed against the end surface of the steel pipe;
A first cleaning head that supports the first brush, the first nozzle, and the guide roller;
A rotating mechanism for rotating the steel pipe or the first cleaning head around the axis of the steel pipe;
A second brush pressed against a partial region in the circumferential direction of the outer peripheral region of the end of the steel pipe;
A second nozzle for supplying a cleaning liquid to the second brush;
A steel pipe cleaning device comprising: a second cleaning head that supports the second brush and the second nozzle. A steel pipe cleaning device according to any one of claims 1 to 5,
An apparatus for cleaning a steel pipe, wherein an orientation of the first brush relative to an end surface of the steel pipe is variable.

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