Improved pusher with wear resistance

Abstract

The present invention relates to an improved pusher with wear resistance, comprising: a shell, a tungsten carbide wear-resistant coating is sprayed on the outer wall of the shell in contact with the well logging wall, a pin hole is provided on the inner wall of the shell, the pin hole is located at the lower end of the shell and on the opposite side of the wear-resistant coating; a leg, which is vertically arranged on the side wall of the shell and has an upper end movably connected to the shell, the leg and the pin hole are located on the same busbar; a plug, which is connected to the shell, and a protruding retractable pin is provided on the side wall of the plug to cooperate with the pin hole. The present invention optimizes and improves the defects of the original structure of the pusher in the prior art, and updates the original structure. The problem of serious wear and tear of the original shell and the structural problems of the pusher are solved, the service life of the pusher is increased, and the overall modification is small, and the method is simple and effective.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum logging equipment, in particular to an improved pusher with wear resistance. Background Art

[0002] In some instruments of petroleum logging equipment, in addition to center logging, there is also well logging close to the well wall, such as nuclear magnetic resonance logging instruments, density logging instruments, etc., and the equipment needs to be used close to the well wall when doing logging work underground. In order to make the instrument have better contact with the well wall, such instruments that need to be used close to the well wall usually use a pusher to help the instrument stick to the well wall. The shell of the pusher will produce friction with the well wall for a long time during operation. This long-term friction will cause serious wear on the side of the pusher shell that is close to the well wall. Not only that, the pusher in the prior art also has structural defects, which will aggravate the wear of the side wall of the pusher when in use. Summary of the invention

[0003] To this end, the present invention provides an improved pusher with wear resistance to overcome the problem of severe wear of the pusher against the well wall in the prior art.

[0004] To achieve the above object, the present invention provides an improved pusher with wear resistance, comprising:

[0005] A shell, wherein a tungsten carbide wear-resistant coating is sprayed on the outer wall of the shell in contact with the well logging wall to improve the wear resistance of the shell, and a pin hole is provided on the inner wall of the shell to fix the plug, and the pin hole is located at the lower end of the shell and on the opposite side of the wear-resistant coating;

[0006] A support leg is vertically arranged on the side wall of the housing and its upper end is movably connected to the housing. By supporting the support leg, the support leg is brought into contact with the well logging wall and the housing is abutted against the well logging wall on the opposite side. The support leg and the thrust pin hole are located on the same generatrix of the housing;

[0007] The plug is connected to the shell, and a protruding retractable pin is provided on the side wall of the plug to cooperate with the pin hole. When the plug is inserted into the specified position of the shell, the pin pops out and enters the pin hole. At this time, the pin hole constrains the pin to fix the pin in the specified position, thereby completing the fixation of the plug.

[0008] Furthermore, the spraying area of ​​the wear-resistant coating accounts for 20%-40% of the cylindrical side area of ​​the shell 1.

[0009] Furthermore, the spraying thickness of the wear-resistant coating is 0.1-0.5 mm.

[0010] Furthermore, the pin is connected to the plug via an elastic component. When the pin is pressed by external force and the pressure is greater than the elastic force of the elastic component, the pin will be retracted into the plug under the force. Before inserting the plug into the shell, press the pin first, and insert the plug into the shell after pressing the pin into the plug.

[0011] Furthermore, the shell is provided with a groove at the lower side of the connection with the supporting leg, and the size of the groove is the same as that of the supporting leg for accommodating the supporting leg.

[0012] Furthermore, the lower end of the plug is fixedly connected to a specific logging instrument. When the plug is connected to the shell, the logging instrument is fixedly connected to the pusher shell. At this time, the support legs are raised to vertically press the pusher against the logging wall so that the logging instrument is vertically pressed against the logging wall.

[0013] Furthermore, an annular groove is provided on the upper side wall of the plug, and a sealing ring is provided in the groove to seal the logging instrument to prevent dust in the logging wall from entering the plug through the groove provided on the side wall of the shell.

[0014] Furthermore, the cross section of the support leg is rectangular, and chamfers are provided at the lower ends of the support legs, respectively, to increase the contact area between the support legs and the logging wall.

[0015] Furthermore, the cross-sectional area of ​​the root of the upper end of the support leg is larger than the cross-sectional area of ​​the lower end, and a chamfer is provided at the position where the cross-sectional area changes.

[0016] Furthermore, a plurality of annular protrusions and depressions are provided on the side wall of the upper end of the pusher housing for connecting with the equipment at the upper end.

[0017] Compared with the prior art, the beneficial effect of the present invention is that the improved structure of the present invention enables the pin pushing hole and the pusher leg to be on the same side, thus avoiding the problem of the thinner wall side moving against the well wall, and increasing the wear resistance of the pusher shell. At the same time, the improved structure adds a layer of wear-resistant coating on the side of the pusher shell against the well wall, further increasing the wear resistance of the pusher shell. The present invention optimizes and improves the defects of the original structure of the pusher in the prior art, and makes updates to the original structure. The problems of severe wear and structural problems of the original pusher shell are solved, the service life of the pusher is increased, and the overall changes are small, and the method is simple and effective.

[0018] Furthermore, the present application provides a pin with an internal elastic component on the plug. After the plug is inserted into the specified position of the shell, the pin will bounce up and enter the pin hole provided in the shell. At this time, the pin can restrain the plug in the radial and axial directions respectively to fix the plug in the specified position, thereby improving the stability of the improved structure of the pusher.

[0019] Furthermore, the shell is provided with a groove at the connection with the support leg. When the pusher enters and exits the logging hole, the support leg can be folded and stored in the groove. By storing the support leg in the groove, the support leg can be prevented from being worn by the well wall when the pusher enters and exits the logging hole, thereby further improving the service life of the pusher structure.

[0020] Furthermore, the plug is fixedly connected to the logging instrument. After the plug is inserted into the shell, the plug is fixedly connected to the shell, so the shell and the logging instrument are relatively fixedly connected. When the legs are raised, the legs will press the pusher against the well wall, and the logging instrument will also press against the well wall, thereby improving the stability of the mechanism and thus improving the detection efficiency of the logging instrument.

[0021] Furthermore, by arranging a sealing ring at the upper end of the plug, it is possible to prevent external dust from entering the well logging instrument through the plug, thereby increasing the service life of the well logging instrument.

[0022] Furthermore, an annular groove is provided at the position where the sealing ring is placed on the plug, so that the sealing ring can be fixed at a specified position, thereby improving the sealing performance of the plug.

[0023] Furthermore, the cross-section of the support leg is rectangular, and a chamfer is provided at the lower end of the support leg. By using a straight contact surface instead of an arc-shaped contact surface, when the support leg contacts the well wall, the contact range is expanded from a point to a line. At the same time, by setting a chamfer, the contact range is expanded from a line to a surface. By increasing the contact area between the support leg and the well wall, the friction between the support leg and the well wall is increased, thereby improving the stability of the pusher when pushing.

[0024] In particular, the cross-sectional area of ​​the root of the leg is larger than the cross-sectional area of ​​the lower end. By thickening the root of the leg, the strength of the leg can be increased, thereby improving the stability of the pusher structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a side sectional view of a pusher in the prior art;

[0026] Figure 2 It is a schematic structural diagram of the improved pusher with wear resistance according to the present invention;

[0027] Figure 3 A side cross-sectional view of the improved pusher with wear resistance according to the present invention;

[0028] Figure 4 This is a partial enlarged view of the plug in the improved pusher with wear resistance according to the present invention. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0030] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0031] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] See also Figure 1 As shown, it is a side sectional view of a pusher in the prior art. It can be seen from the figure that in the prior art, the pin and the pin hole are arranged on opposite sides of the support leg. When the support leg is raised, the pin hole side will be in contact with the logging wall. Since the wall thickness of the pin hole in the shell is smaller than the shell wall thickness at other positions, the pin hole of the shell will be severely worn under long-term use.

[0033] See also Figure 2 and Figure 3 As shown, they are respectively a schematic diagram of the structure of the improved pusher with wear resistance and a side sectional view of the improved pusher with wear resistance of the present invention, comprising a shell 1, a leg 2, a wear-resistant coating 3 and a plug 4. The leg 2 is movably connected to the shell 1 to push the shell 1 against the logging wall. The wear-resistant coating 3 is sprayed on a specified position of the outer wall of the shell 1 to increase the wear resistance of the shell 1. The plug 4 is inserted inside the shell 1 to connect the shell 1 to the logging instrument (not shown in the figure).

[0034] When using the improved pusher with wear resistance, the plug 4 is first inserted into the designated position in the housing 1 to connect the logging instrument with the pusher. After the insertion is completed, the pusher is placed vertically or horizontally into the logging hole. When the pusher moves to the designated position, the legs 2 are controlled to open. The legs 2 are in contact with the logging wall after opening. At this time, the legs 2 continue to open outward and apply a reverse force to the housing 1. After receiving the reverse force, the housing abuts against the logging wall, thereby driving the logging instrument connected to the housing 1 to abut against the logging wall. It can be understood that the specific structure inside the housing when the legs 2 are opened is clear to the technicians in this field. The driving mechanism of the legs 2 can be hydraulically driven, motor driven or other driving methods. The connection relationship between the legs 2 and the driving device can be a straight rod connection, a worm connection or other types of connection methods, as long as the legs 2 can be supported after the housing 1 reaches the designated position to abut the housing 1 against the logging wall.

[0035] Please continue reading Figure 2 and Figure 3 As shown, the shell 1 described in this embodiment is a cylindrical metal shell, and a plurality of annular protrusions are provided at its upper end, and an annular groove is respectively opened in each annular protrusion for connecting with the designated equipment at the upper end. A groove is opened on the side wall of the middle section of the shell 1 for accommodating the support leg 2. A wear-resistant coating 3 is sprayed on the outer wall on the opposite side of the groove of the shell 1, and the wear-resistant coating 3 is made of tungsten carbide. A pin hole 11 is provided on the inner wall of the lower end of the shell 1 to cooperate with the pin 41 to constrain the plug 4. The center of the pin hole and the center line of the groove are located on the same busbar, and the line connecting the busbar where the center line of the wear-resistant coating is located passes through the center axis of the shell. When the legs 2 are raised, the lower ends of the legs 2 will contact the wellbore wall and cannot move. At this time, as the legs 2 continue to open, the legs 2 will exert a reverse force on the shell 1. After receiving the reverse force, the shell 1 abuts against the wellbore wall on the other side to complete the abutment. At this time, the wear-resistant coating 3 contacts the wellbore wall to prevent the part of the shell 1 that contacts the wellbore wall from being worn. It can be understood that the raw material of the wear-resistant coating can be tungsten carbide coating or other raw materials, as long as the wear-resistant coating can prevent the shell 1 from being worn.

[0036] Please continue reading Figure 3 As shown, the leg 2 of this embodiment is a long rod, which is located in the groove provided in the housing 1 and is movably connected to the housing 1. A connecting hole is provided at the upper end of the leg 2 for connecting with the housing and rotating in a specified direction. The cross section of the leg 2 is rectangular and a chamfer is provided at the lower end of the leg 2 to increase the contact area with the well logging wall. The upper end of the leg 2 is thicker than the lower end, and a chamfer is provided at the connection between the thick and thin ends to improve the stability of the leg 2.

[0037] When the leg 2 is retracted, it will be stored in the groove provided in the housing 1 to prevent the leg from protruding and causing wear when the pusher enters and exits the wellbore. When the leg 2 is raised, the chamfered inclined surface at the lower end will contact the wellbore wall, increasing the friction between the leg 2 and the wellbore wall by increasing the contact area, so that the pusher can be stably pressed against the designated position. It can be understood that the shape of the leg 2 is not specifically limited in this embodiment, as long as the leg 2 can stably press the pusher against the wellbore wall when raised.

[0038] See also Figure 4 As shown in FIG. 1 , it is a partial enlarged view of the plug 4 in the improved pusher with wear resistance described in this embodiment. The lower end of the plug 4 is connected to a designated logging instrument, and an annular groove is provided on the side wall of the end of the plug 4, and a sealing ring is provided in the annular groove to prevent dust in the logging wall from entering the inside of the logging instrument through the gap between the groove provided in the housing 1 and the plug 4. A locking thrust pin 41 is provided on the side wall of the plug 4, and an elastic component 42 is provided between the locking thrust pin 41 and the plug 4 to cooperate with the locking thrust pin hole 11 to fix the plug 4 in a designated position. When inserting the plug 4, first press the pin, when the pressure is greater than the elastic force of the elastic component 42, the pin hole 41 is pressed and retracted into the shell 4, then the plug is inserted into the housing 1, when the plug 4 enters the designated position in the housing 1, the pin 41 and the pin hole 11 are located at the same center, then the housing 1 no longer constrains the pin 41, the pin 41 extends under the elastic force of the elastic component 42 and enters the pin hole 11, then the pin 41 and the pin hole 11 cooperate to constrain the plug 4 and fix the plug 4 at the designated position of the housing 1. It is understandable that the elastic component 42 can be a built-in spring or other elastic parts, as long as the elastic component 42 can lift the pin 41 when it is not under pressure.

[0039] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] Embodiment 1

[0041] The wear-resistant coating 3 of this embodiment is a tungsten carbide coating, and its spraying area accounts for 20% of the cylindrical side area of ​​the shell 1. The spraying thickness is 0.1 mm. After using the pusher of this embodiment 5000 times, the wear degree of the pusher is 7.88%.

[0042] Embodiment 2

[0043] The wear-resistant coating 3 of this embodiment is a tungsten carbide coating, and its spraying area accounts for 30% of the cylindrical side area of ​​the shell 1. The spraying thickness is 0.3mm. After using the pusher of this embodiment for 5000 times, the wear degree of the pusher is 6.64%.

[0044] Embodiment 3

[0045] The wear-resistant coating 3 of this embodiment is a tungsten carbide coating, and its spraying area accounts for 40% of the cylindrical side area of ​​the shell 1. The spraying thickness is 0.5 mm. After using the pusher of this embodiment for 5000 times, the wear degree of the pusher is 3.75%.

[0046] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An improved pusher with wear resistance, characterized in that: include: A shell, wherein a tungsten carbide wear-resistant coating is sprayed on the outer wall of the shell in contact with the well logging wall to improve the wear resistance of the shell, and a pin hole is provided on the inner wall of the shell to fix the plug, and the pin hole is located at the lower end of the shell and on the opposite side of the wear-resistant coating; A support leg is vertically arranged on the side wall of the housing and its upper end is movably connected to the housing. By supporting the support leg, the support leg is brought into contact with the well logging wall and the housing is abutted against the well logging wall on the opposite side. The support leg and the thrust pin hole are located on the same generatrix of the housing; The plug is connected to the housing, and a protruding retractable pin is provided on the side wall of the plug to cooperate with the pin hole; when the plug is inserted into the designated position of the housing, the pin pops out and enters the pin hole, and the pin hole constrains the pin to fix the pin at the designated position, thereby completing the fixing of the plug; The spraying area of ​​the wear-resistant coating accounts for 20%-40% of the cylindrical side area of ​​the shell (1); The spraying thickness of the wear-resistant coating is 0.1-0.5 mm; The pin is connected to the plug via an elastic component, and when the pin is pressed by an external force and the pressure is greater than the elastic force of the elastic component, the pin will be forced to retract into the plug; before inserting the plug into the housing, the pin is pressed first, and after the pin is pressed into the plug, the plug is inserted into the housing; The upper side wall of the plug is provided with an annular groove, and a sealing ring is provided in the groove to seal the well logging instrument to prevent dust in the well logging wall from entering the plug through the groove provided in the side wall of the shell; The cross section of the support leg is rectangular, and chamfers are provided at the lower ends of the support legs, respectively, to increase the contact area between the support legs and the logging wall; The cross-sectional area of ​​the root of the upper end of the support leg is larger than the cross-sectional area of ​​the lower end, and a chamfer is provided at the position where the cross-sectional area changes.

2. The improved pusher with wear resistance according to claim 1, characterized in that: The shell is provided with a groove at the lower side of the connection with the supporting leg, and the size of the groove is the same as that of the supporting leg for accommodating the supporting leg.

3. The improved pusher with wear resistance according to claim 2, characterized in that: The lower end of the plug is fixedly connected to a specific logging instrument. When the plug is connected to the shell, the logging instrument is fixedly connected to the pusher shell. At this time, the legs are propped up to vertically press the pusher against the logging wall so that the logging instrument is vertically pressed against the logging wall.

4. The improved pusher with wear resistance according to claim 1, characterized in that: The upper side wall of the pusher housing is provided with a plurality of annular protrusions and depressions for connecting with the upper equipment.

Images