CN115506724B - Pipe inner diameter axial, radial and multi-trigger centralizer nipple - Google Patents

Abstract

The invention relates to a pipe inner diameter axial, radial and multi-trigger centralizer nipple, when the pipe is suddenly changed into a small diameter in the process of small diameter triggering, namely through pipe break, a centralizer elastic sheet is deformed by pressure so as to trigger a switch signal, thereby recording the pipe section number in an underground pipe and obtaining the pipe length. Compared with the prior art, the invention is suitable for the occasions of abrupt change of the inner diameter of the standard pipeline and more impurities, and the standard pipeline has the same length and internal structure of each pipeline and plays a certain role in centralizing.

Description

Pipe inner diameter axial, radial and multi-trigger centralizer nipple

Technical Field

The invention relates to the technical field of underground pipeline measurement, in particular to a pipe inner diameter axial, radial and multi-trigger centralizer nipple.

Background

The existing underground pipeline measurement is that the length of a through pipe is recorded through a pulley block or a measuring instrument pull rope, the pulley block mode cannot be suitable for the conditions that the inner diameter of a small pipeline is suddenly changed and impurities are more, the condition that the pulley block is blocked or even blocked is likely to occur when the size is suddenly changed, and the impurities in a pipeline also can influence the smooth rotation of a pulley, so that the measurement accuracy of the length is influenced. The pull rope method requires a device for recording the rope length outside the pipeline, and is not suitable for a wireless measurement system.

The structure of many underground pipelines is that the pipeline comprises a plurality of equal length pipe sections with the same internal structure, and a small diameter structure with abrupt inner diameter changes is arranged between two adjacent pipe sections.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a pipe inner diameter axial, radial and multi-trigger centralizer nipple which can be used for measuring the length of a standard section pipe with small inner diameter and abrupt inner diameter.

The aim of the invention can be achieved by the following technical scheme:

The pipe inner diameter axial triggering centralizer nipple is used for a pipe with a small diameter structure, wherein the pipe comprises a plurality of pipe sections with equal length and same internal structure, a small diameter structure with abrupt inner diameter is arranged between two adjacent pipe sections, the pipe inner diameter axial triggering centralizer nipple comprises a connector socket, a proximity switch, a switch triggering structure, a compression spring, a guide pin, a centralizer sliding block, a centralizer elastic sheet, a connector plug and a shell structure for fixing the whole nipple,

The centralizer spring piece is positioned on the outer side of the shell structure, one end of the centralizer spring piece is connected with the shell structure, and the other end of the centralizer spring piece is connected with the centralizer sliding block; the proximity switch, the switch trigger structure, the compression spring, the guide pin and the centralizer slider are all located inside the shell structure, the centralizer slider is connected with the switch trigger structure and the guide pin respectively, the centralizer slider is movably connected with the shell structure, the proximity switch and the compression spring are all fixed by the shell structure, the switch trigger structure is opposite to the proximity switch, the guide pin is opposite to the compression spring, the proximity switch is connected with the connector socket and the connector plug respectively and is used for acquiring electric energy and transmitting contact signals, and calculating the length of a pipeline according to the number of the contact signals and the length of a single pipe joint acquired in advance.

Further, the number of the centralizer spring pieces is multiple, and the switch triggering structure triggers the proximity switch by adjusting the elasticity, thickness or radian of materials of the centralizer spring pieces or the specification of the compression spring and the position or length of the switch triggering structure, so that all the centralizer spring pieces are compressed.

Further, the switch triggering structure comprises a triggering pin and a triggering pin adjusting block, wherein the triggering pin adjusting block is installed on the centralizer sliding block, the triggering pin is installed on the triggering pin adjusting block, and the triggering pin is opposite to the proximity switch.

Further, the pipeline inner diameter axial triggering centralizer nipple further comprises a linear bearing, the linear bearing is sleeved on the shell structure shaft, and the linear bearing is connected with the centralizer sliding block through a screw.

Further, the shell structure includes connector fixed plate, connector seat, centralizer rear end shell, switch visor, triggers nipple joint protection casing and centralizer front end shell, connector socket, connector fixed plate and connector seat connect gradually, the connector seat is installed inside the centralizer rear end shell, the centralizer rear end shell outside is equipped with the proximity switch mounting groove, proximity switch installs in the proximity switch mounting groove, the switch visor is installed in the proximity switch outside, the arched portion of centralizer shell fragment is located trigger nipple joint protection casing outside, centralizer shell fragment both ends are located trigger nipple joint protection casing is inboard, connector plug installs the centralizer front end shell is inboard, switch trigger structure, compression spring, guide pin and centralizer slider all are located trigger nipple joint protection casing inboard, the centralizer rear end shell, trigger protection casing and centralizer front end shell connect gradually.

Further, a sealing ring is arranged on the outer side of the front end shell of the centralizer.

The invention also provides a pipe inner diameter radial triggering centralizer nipple which is used for a pipe with a small diameter structure, wherein the pipe comprises a plurality of pipe sections with equal length and same internal structure, a small diameter structure with abrupt inner diameter is arranged between two adjacent pipe sections, the pipe inner diameter radial triggering centralizer nipple comprises a connector socket, a proximity switch, a centralizer spring plate, a triggering pin, a chute cover plate, a sliding column, a connector plug and a shell structure for fixing the whole nipple,

The centralizer spring plate and the chute cover plate are both positioned outside the shell structure, the number of the chute cover plates is multiple, the chute cover plates are all connected with the shell structure, each chute cover plate is provided with a chute for the sliding column to move, two ends of the centralizer spring plate are respectively and movably connected with the sliding cover plate through the sliding column, and the middle part of the centralizer spring plate is connected with a trigger pin;

The proximity switch is located inside the shell structure, the trigger pin penetrates through the shell structure and is opposite to the proximity switch, the proximity switch is respectively connected with the connector socket and the connector plug and used for acquiring electric energy and transmitting contact signals, and the length of a pipeline is calculated according to the number of the contact signals and the length of a single pipe joint acquired in advance.

Further, the number of the centralizer spring pieces is one or more, each centralizer spring piece corresponds to one proximity switch, if all the proximity switches are triggered, the contact signal at the moment is recorded, and otherwise, the contact signal is used as an invalid contact signal.

Further, a sealing ring is arranged on the outer side of one end, connected with the connector plug, of the shell structure.

The invention also provides a multi-trigger centralizer nipple based on the two trigger centralizer nipples, which takes a structure formed by the proximity switch, the switch trigger structure, the compression spring, the guide pin, the centralizer slider and the centralizer spring plate of the trigger centralizer nipple as a trigger component; taking a structure consisting of the proximity switch, the centralizer spring plate, the trigger pin, the chute cover plate and the sliding column in the other trigger centralizer pup joint as a trigger component;

The multi-trigger centralizer nipple comprises a plurality of trigger assemblies, connector sockets, connector plugs and a shell structure for fixing the whole nipple, wherein the trigger assemblies are sequentially connected, the proximity switches in the trigger assemblies are respectively connected with the connector sockets and the connector plugs and are used for acquiring electric energy and transmitting contact signals, and the back pumping signals are judged and removed according to the contact signals and the connection sequence of the proximity switches, so that the pipeline length is calculated according to the number of the residual contact signals and the length of a single pipe joint acquired in advance.

Compared with the prior art, the invention has the following advantages:

The invention provides a centralizer nipple capable of carrying an underground pipeline inertial navigation system or other measuring instruments, when a small diameter is triggered, namely when a pipe is suddenly changed into a small diameter in the process of pipe passing, a centralizer elastic sheet is pressed and deformed, so that a switching signal is triggered, the pipe section number in an underground pipeline is recorded, the pipeline length is obtained, and the centralizer nipple is suitable for occasions of abrupt change of the inner diameter of a standard section pipeline (the length of each section pipeline is the same as the inner structure) and more impurities, such as a standard drill collar and the like, can be used for measuring the length of the standard section pipeline with the small inner diameter and abrupt change of the inner diameter, and plays a certain role in centralizing.

Drawings

FIG. 1 is a diagram of a small diameter trigger centralizer nipple through pipe trigger process;

FIG. 2 is an external view of an axial trigger centralizer nipple;

FIG. 3 is a cross-sectional and operational view of an axial trigger centralizer nipple;

FIG. 4 is an exploded view of an axially triggered centralizer nipple;

In fig. 3 and 4, 1, connector holder, 2, centralizer rear end shell, 3, screw a,4, switch press piece, 5, switch protective cover, 6, proximity switch, 7, O-ring a,8, trigger pin, 9, centralizer slider, 10, trigger pin adjustment block, 11, screw B,12, linear bearing, 13, centralizer spring, 14, trigger nipple shield, 15, centralizer front end shell, 16, O-ring B,17, connector plug, 18, guide pin, 19, compression spring, 20, connector socket, 21, connector fixing plate, 22, screw C,23, screw D,24, screw E,25, screw F,26, screw G,27, screw H;

FIG. 5 is a state diagram of the inside of a pressurized pipe of a short piece of an axial trigger centralizer;

FIG. 6 is an external view of a radial trigger centralizer nipple;

FIG. 7 is a cross-sectional view of a radial trigger centralizer nipple;

FIG. 8 is an exploded view of a radial trigger centralizer nipple;

In fig. 7 and 8, 1, connector holder, 2, centralizer bracket, 3, screw a,4, adapter plate, 5, chute cover plate, 6, sliding column, 7, screw b,8, screw c,9, proximity switch, 10, centralizer spring, 11, screw d,12, trigger pin, 13, O-ring, 14, connector plug, 15, screw e,16, switch bracket, 17, connector socket, 18, connector fixing plate, 19, screw f,20, screw g,21, screw h;

FIG. 9 is a schematic view of a dual trigger centralizer nipple (discrete), wherein ① is an axial trigger centralizer nipple; ② The short joint of the centralizer is triggered radially;

FIG. 10 is a schematic view (integral) of a dual trigger centralizer nipple, wherein I, a trigger nipple shield, II, a trigger nipple front end, III, a proximity switch capsule, IV, a front end trigger slide, V, a centralizer spring, VI, a trigger nipple center shaft, VII, a rear end trigger slide, VIII, a trigger nipple rear end;

Fig. 11 is a front view of a dual trigger centralizer nipple.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.

The embodiment provides a small-diameter triggering centralizer nipple, in particular to a device for centralizing and triggering a small-diameter instrument in a pipeline, when the small-diameter triggering is that a through pipe is suddenly changed into a small diameter in the process of pipe passing, a centralizer elastic sheet is deformed by pressure, so as to trigger a switch signal, thereby recording the pipe section number in an underground pipeline, obtaining the pipeline length, being applicable to the occasions of the standard pipeline section (the length of each pipeline section is the same as the internal structure) and the abrupt change of the inner diameter of the pipe and more impurities, such as a standard drill collar and the like, and being shown in figure 1 in the working process.

The small-diameter trigger centralizer nipple has two forms, namely an axial trigger centralizer nipple and a radial trigger centralizer nipple, and the two forms are respectively described below.

Example 1

The embodiment provides a pipe inner diameter axial triggering centralizer nipple which is used for a pipe with a plurality of pipe joints with equal length and same internal structure, wherein a small diameter structure with abrupt inner diameter is arranged between two adjacent pipe joints, the pipe inner diameter axial triggering centralizer nipple comprises a connector socket, a proximity switch, a switch triggering structure, a compression spring, a guide pin, a centralizer sliding block, a centralizer elastic sheet, a connector plug and a shell structure for fixing the whole nipple,

The centralizer spring piece is positioned at the outer side of the shell structure, one end of the centralizer spring piece is connected with the shell structure, and the other end of the centralizer spring piece is connected with the centralizer sliding block; the proximity switch, the switch trigger structure, the compression spring, the guide pin and the centralizer slider are all located on the inner side of the shell structure, the centralizer slider is connected with the switch trigger structure and the guide pin respectively, the centralizer slider is movably connected with the shell structure, the proximity switch and the compression spring are both fixed by the shell structure, the switch trigger structure is opposite to the proximity switch, the guide pin is opposite to the compression spring, the proximity switch is respectively connected with the connector socket and the connector plug, and is used for acquiring electric energy and transmitting contact signals, and calculating the pipeline length according to the number of the contact signals and the length of a single pipe joint acquired in advance.

The number of centralizer tabs may be one or more,

When the number of the spring plates of the centralizer is multiple, the spring plates are designed to drive the sliding blocks to avoid false triggering, and when a single spring plate or a plurality of spring plates are pressed, the sliding blocks are not sufficiently pushed, and only after all the spring plates are pressed, the sliding blocks can be pushed to generate a triggering signal. In order to achieve the above situation, the material elasticity, thickness or radian of the centralizer spring sheet, or the specification of the compression spring, the position or length of the switch triggering structure can be adjusted, so that the switch triggering structure triggers the proximity switch when all the centralizer spring sheets are compressed.

In this embodiment, the switch trigger structure includes trigger pin and trigger pin adjusting block, and the trigger pin adjusting block is installed on the centralizer slider, and the trigger pin is installed on the trigger pin adjusting block, and the trigger pin is just to proximity switch.

In order to ensure that the centralizer slider moves linearly, as a preferred embodiment, the pipe inner diameter axial trigger centralizer nipple further comprises a linear bearing sleeved on the shell structure shaft, and the linear bearing is connected with the centralizer slider through a screw.

In this embodiment, the shell structure specifically includes connector fixed plate, connector holder, centralizer rear end shell, switch visor, trigger nipple shield and centralizer front end shell, and connector socket, connector fixed plate and connector holder connect gradually, and the connector holder is installed inside the centralizer rear end shell, and the centralizer rear end shell outside is equipped with the proximity switch mounting groove, and proximity switch installs in the proximity switch mounting groove, and the switch visor is installed in the proximity switch outside, the arched portion of centralizer shell fragment is located trigger nipple shield outside, the centralizer shell fragment both ends are located trigger nipple shield inboard, and the connector plug is installed in the centralizer front end shell inboard, and switch trigger structure, compression spring, guide pin and centralizer slider all are located trigger nipple shield inboard, and centralizer rear end shell, trigger nipple shield and centralizer front end shell connect gradually.

A preferred embodiment of a pipe inner diameter axially triggered centralizer nipple is described in detail below.

The short section structure of the axial triggering centralizer is shown in fig. 2, 3 and 4, and the specific assembly relation is as follows: the connector socket 20 is fixed on the connector fixing plate 21 through the mounting accessory of the connector fixing plate, the connector fixing plate 21 is fixed on the connector base 1 through the screw C22, the connector base 1 is fixed on the centralizer rear end shell 2 through the screw D23, the proximity switch 6 is fixed on the centralizer rear end shell 2 through the switch pressing piece 4 and the screw A3, wires at the tail of the proximity switch 6 are connected with the connector socket 20 and the connector plug 17, the switch protection cover 5 is fixed on the centralizer rear end shell 2 through the screw E24, the trigger pin 8 is fixed on the trigger pin adjusting block 10 through the screw E24, the trigger pin adjusting block 10 is fixed on the centralizer sliding block 9 through the screw F25, the guide pin 18 is fixed on the centralizer sliding block 9 through the screw F25, the centralizer sliding block 9 is connected with the linear bearing 12 through the screw G26, the O-shaped sealing ring A7 is sleeved on the centralizer front end shell 15, the shaft ends of the centralizer front end shell 15 are inserted into holes of the centralizer rear end shell 2, one end 13 is fixed on the centralizer sliding block B11 through the other end 9, the other end of the centralizer front end shell 15 is connected with the guide pin 14 through the guide pin B, the other end of the guide pin is connected with the centralizer front end shell 14 through the guide pin B, and the guide pin H is connected with the centralizer front end shell 14 through the guide pin B, and the guide end of the guide end shell 19 is connected with the guide end of the centralizer front end shell 2 through the guide pin B.

The working process is shown in fig. 3, specifically: when the axial triggering centralizer pup joint passes through the small diameter of the pipeline, the centralizer spring pieces 13 in four mutually perpendicular directions are compressed and deformed to the position of a broken line, the right end is fixed, the left end is connected with the centralizer sliding block 9 and the linear bearing 12, the centralizer sliding block 9 and the linear bearing 12 are pushed to move leftwards, the triggering pin 8 moves to the sensitive position (the position of the broken line) of the proximity switch 6, the proximity switch 6 is triggered, a triggering signal is generated, the signal is transmitted to a corresponding instrument at the right end through the connector plug 17 and recorded, and in addition, the power required by the proximity switch 6 is supplied through the connector socket 20. The linear bearing 12 is a linear bearing resistant to water and impurities, so that the pushing process is smooth. By adjusting the material, thickness or radian of the centralizer spring 13 and the specification of the compression spring 19 and adjusting the left and right positions of the trigger pin adjusting block 10 (the adjustable positions of the strip holes designed on the trigger pin adjusting block 10), the lengths of the trigger pin 8 and the guide pin 18 can be adjusted to compress one or two or three of the centralizer spring 13 can not push the centralizer sliding block 9 and the linear bearing 12, so that the proximity switch 6 can not be triggered, and the state of the proximity switch 6 can be triggered only by simultaneously compressing the four centralizer spring 13, thereby achieving the effect of avoiding false triggering, and avoiding false triggering signals generated by the impact of the nipple in a pipeline, and particularly, the structure is shown in fig. 5. Because centralizer shell fragment 13, compression spring 19, trigger pin adjusting block 10, trigger pin 8, guide pin 18 all can be adjusted, this nipple joint that makes can adapt to more pipe internal diameters through the adjustment to adapt to more application scenario, O shape sealing washer A7 and O shape sealing washer B16 can make this nipple joint waterproof, trigger nipple joint protection casing 14 can protect inner structure from striking and massive impurity's entering. The left end and the right end of the nipple are standard threaded interfaces, and different devices and instruments can be carried.

The triggering mode of the short section is that the triggering pin axially generates displacement so as to trigger the proximity switch, so that the short section is an axial triggering centralizer short section, the structure is only one example of the short section, and is not limited to four centralizer elastic sheets, two, three and the like, and the triggering mode is within the practical range of the invention, wherein the structural modes of a plug, a socket, the proximity switch, a linear bearing and the like of a connector are not limited to the mode in the example.

Example 2

The embodiment provides a pipe inner diameter radial triggering centralizer nipple which is used for containing a plurality of pipe sections with equal length and same internal structure, a pipe with a small diameter structure with abrupt inner diameter is arranged between two adjacent pipe sections, the pipe inner diameter radial triggering centralizer nipple comprises a connector socket, a proximity switch, a centralizer spring plate, a triggering pin, a chute cover plate, a sliding column, a connector plug and a shell structure for fixing the whole nipple,

The centralizer spring plate and the chute cover plate are both positioned at the outer side of the shell structure, the number of the chute cover plates is multiple, the chute cover plates are all connected with the shell structure, each chute cover plate is provided with a chute for the sliding column to move, the two ends of the centralizer spring plate are respectively movably connected with the sliding cover plate through the sliding column, and the middle part of the centralizer spring plate is connected with a trigger pin;

The proximity switch is located the shell structure inboard, and the trigger pin runs through the shell structure to just to proximity switch, proximity switch connects connector socket and connector plug respectively for acquire electric energy and transmission contact signal, according to the length of the single tube coupling of number and the acquisition of contact signal in advance, calculate pipeline length.

The number of the centralizer spring pieces is one or more, each centralizer spring piece corresponds to one proximity switch, and in order to avoid false triggering, if all the proximity switches are triggered, the contact signal at the moment is recorded, otherwise, the contact signal is used as an invalid contact signal.

Preferably, a sealing ring is arranged on the outer side of one end of the shell structure, which is connected with the connector plug.

A preferred embodiment of a pipe inner diameter radially triggered centralizer sub is described in detail below.

The short section structure of the radial triggering centralizer in the embodiment is shown in fig. 6, 7 and 8, and the specific assembly relation is as follows: the connector socket 17 is fixed on the connector fixing plate 18 through the accessory of taking, the connector fixing plate 18 is fixed on the connector base 1 through screw f19, the connector base 1 is fixed on the adapter plate 4 through screw a3, the adapter plate 4 is fixed on the switch support 16 through screw g20, the switch support 16 is fixed on the centralizer support 2 through screw e15, the three proximity switches 9 are fixed on the switch support 16 through screw c8, the tail wires of the three proximity switches 9 are connected with the connector socket 17 and the connector plug 14, six sliding columns 6 are respectively put into six grooves of the centralizer support 2, six chute cover plates 5 are respectively fixed on the centralizer support 2 through screws h21, the three centralizer spring plates 10 are respectively connected with the three trigger pins 12 through screws d11, two ends of the three centralizer spring plates 10 are respectively connected with the sliding columns 6 through screws b7, and O-shaped sealing rings 13 are sleeved on the centralizer support 2.

The working process is shown in fig. 7, specifically: when the radial trigger centralizer nipple passes through the small diameter of a pipeline, the three centralizer elastic sheets 10 are pressed and deformed, so that the three trigger pins 12 are respectively pushed to move to the positions of dotted lines in a sensitive position diagram of the proximity switch 9, the three proximity switches 9 are triggered, trigger signals of the three proximity switches 9 are transmitted to the right-end instrument judging end through the connector plug 14, the judging end judges that the nipple passes through the small diameter and records data when judging that the three proximity switches 9 are triggered simultaneously, the three proximity switches 9 are respectively and independently triggered, false triggering caused by impact in the non-small diameter can be avoided, namely, one to two proximity switches 9 are triggered and judged to be not triggered, power required by the three proximity switches 9 is supplied by the connector socket 17, the O-shaped sealing ring 13 plays a waterproof role when the nipple is abutted to other instruments, all components are arranged on the integrated centralizer bracket 2, and therefore waterproof, dustproof and impurity performance is improved.

The trigger mode of the short section is that the trigger pin radially generates displacement so as to trigger the proximity switch, so that the short section is a radial trigger centralizer short section, the structure is only one example of the short section, and is not limited to three centralizer elastic sheets, two, four and the like, and the structure modes of a plug, a socket, a proximity switch and the like of a connector used in the short section are not limited to the mode in the example.

Example 3

In order to avoid false triggering, a plurality of elastic sheets are designed to trigger corresponding proximity switches respectively, a single elastic sheet or a plurality of elastic sheets trigger the corresponding proximity switches respectively when being pressed, and when all the proximity switches are triggered, a trigger signal can be generated.

The double-trigger or multi-trigger pup joint can be used for meeting the situation of clamping stagnation or other pulling instruments needing to be pulled back in the process of a through pipe, and can avoid that the signal of pulling back trigger is counted into the length calculation, and the specific principle is as follows: when the pipe is passed, the front end centralizer spring plate group of the short section passes through the small diameter of the pipe and is triggered, the rear end centralizer spring plate group is triggered after a certain time delay, the delay time depends on the center interval of the two groups of centralizer spring plate groups, when the back pumping instrument is needed, the rear end centralizer spring plate group is triggered, the front end centralizer spring plate is triggered, whether the trigger signal is the trigger signal generated in the pumping process can be judged according to the front and back trigger interval and the trigger sequence, and false triggering can be avoided by eliminating the trigger signals, so that the length of the pipe can be measured correctly, and the length of the pipe can be seen in fig. 11.

The embodiment is a multi-trigger centralizer nipple based on the axial trigger centralizer nipple of the inner diameter of a pipeline according to embodiment 1 or embodiment 2, wherein a structure formed by a proximity switch, a switch trigger structure, a compression spring, a guide pin, a centralizer slider and a centralizer spring sheet in embodiment 1 is used as a trigger assembly; the structure composed of the proximity switch, the centralizer spring plate, the trigger pin, the chute cover plate and the sliding column in the embodiment 2 is used as a trigger component;

The multi-trigger centralizer nipple comprises a plurality of trigger components, a connector socket, a connector plug and a shell structure for fixing the whole nipple, wherein the trigger components are sequentially connected, proximity switches in the trigger components are respectively connected with the connector socket and the connector plug and are used for acquiring electric energy and transmitting contact signals, and the back-pumping signals are judged and removed according to the contact signals and the connection sequence of the proximity switches, so that the pipeline length is calculated according to the number of the residual contact signals and the length of a single pipe joint acquired in advance.

A preferred embodiment of a multi-trigger centralizer sub for an inner diameter axial trigger centralizer sub of a pipeline is described in detail below.

The trigger pup joint in the form of embodiment 1 or embodiment 2 is formed by combining two trigger pup joints together or according to the structural principle, see fig. 9 and 10, and fig. 9 is that the two trigger pup joints are butted end to end through a standard threaded interface and an electrical interface; fig. 10 shows that the structural design is integrated by the same principle, so as to reduce parts and mechanical and electrical interfaces, specifically, one end of each of two groups of centralizer elastic sheets v is fixed with a trigger nipple central shaft vi, the other end of each of the two groups of centralizer elastic sheets v is fixed with a front trigger sliding block iv and a rear trigger sliding block vii, the front trigger sliding block iv and the rear trigger sliding block vii are respectively installed on two end shafts of the trigger nipple central shaft vi, the trigger nipple front end ii and the trigger nipple rear end viii are respectively butted with the trigger nipple central shaft vi, the trigger nipple protective cover i is fixed on the trigger nipple central shaft vi, and two ends of the trigger nipple protective cover i are connected with the trigger nipple front end ii and the trigger nipple rear end viii, wherein the trigger nipple front end ii and the trigger nipple rear end viii are respectively provided with a proximity switch cabin iii, the front trigger sliding block iv and the rear trigger sliding block vii are respectively assembled into an axial trigger nipple and a radial trigger nipple in embodiment 1 and embodiment 2, and the double trigger nipple working principle is the same as the trigger nipple working principle.

The double trigger nipple can be used for the situation that the pulling instrument is pulled back when clamping stagnation or other needs are met in the process of the through pipe, and the length calculation of the signal triggered by the pulling back can be prevented, and the specific principle is as follows: when the pipe is passed, the front end centralizer spring plate group of the short section passes through the small diameter of the pipe and is triggered, the rear end centralizer spring plate group is triggered after a certain time delay, the delay time depends on the center interval of the two groups of centralizer spring plate groups, when the back pumping instrument is needed, the rear end centralizer spring plate group is triggered, the front end centralizer spring plate is triggered, whether the trigger signal is the trigger signal generated in the pumping process can be judged according to the front and back trigger interval and the trigger sequence, and false triggering can be avoided by eliminating the trigger signals, so that the length of the pipe can be measured correctly, and the length of the pipe can be seen in fig. 11.

The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (8)

1. The pipe inner diameter axial triggering centralizer nipple is used for a pipe with a small diameter structure, which comprises a plurality of pipe sections with equal length and same internal structure, wherein the small diameter structure with abrupt inner diameter is arranged between two adjacent pipe sections, and is characterized in that the pipe inner diameter axial triggering centralizer nipple comprises a connector socket, a proximity switch, a switch triggering structure, a compression spring, a guide pin, a centralizer sliding block, a centralizer elastic sheet, a connector plug and a shell structure for fixing the whole nipple,

The centralizer spring piece is positioned on the outer side of the shell structure, one end of the centralizer spring piece is connected with the shell structure, and the other end of the centralizer spring piece is connected with the centralizer sliding block; the proximity switch, the switch triggering structure, the compression spring, the guide pin and the centralizer slider are all positioned on the inner side of the shell structure, the centralizer slider is respectively connected with the switch triggering structure and the guide pin, the centralizer slider is movably connected with the shell structure, the proximity switch and the compression spring are both fixed by the shell structure, the switch triggering structure is opposite to the proximity switch, the guide pin is opposite to the compression spring, the proximity switch is respectively connected with the connector socket and the connector plug, and is used for acquiring electric energy and transmitting contact signals, and calculating the pipeline length according to the number of the contact signals and the length of a single pipe joint acquired in advance;

The number of the centralizer spring pieces is multiple, and the switch triggering structure triggers the proximity switch by adjusting the elasticity, thickness or radian of materials of the centralizer spring pieces or the specification of the compression spring and the position or length of the switch triggering structure, so that all the centralizer spring pieces are compressed.

2. The pipe inner diameter axial trigger centralizer nipple of claim 1, wherein the switch trigger structure comprises a trigger pin and a trigger pin adjustment block, the trigger pin adjustment block is mounted on the centralizer slider, the trigger pin is mounted on the trigger pin adjustment block, and the trigger pin is opposite to the proximity switch.

3. The pipe inner diameter axial trigger centralizer nipple of claim 1, further comprising a linear bearing sleeved on the housing structure shaft, wherein the linear bearing is connected with a centralizer slider by a screw.

4. The pipe inner diameter axial triggering centralizer nipple of claim 1, wherein the shell structure comprises a connector fixing plate, a connector seat, a centralizer rear end shell, a switch protecting cover, a triggering nipple shield and a centralizer front end shell, the connector socket, the connector fixing plate and the connector seat are sequentially connected, the connector seat is arranged inside the centralizer rear end shell, a proximity switch mounting groove is formed in the outer side of the centralizer rear end shell, the proximity switch is arranged in the proximity switch mounting groove, the switch protecting cover is arranged on the outer side of the proximity switch, the arched rising part of the centralizer elastic sheet is positioned on the outer side of the triggering nipple shield, two ends of the centralizer elastic sheet are positioned on the inner side of the triggering nipple shield, the connector plug is arranged on the inner side of the centralizer front end shell, and the switch triggering structure, the compression spring, the guide pin and the centralizer slider are sequentially connected with the centralizer rear end shell, the triggering nipple shield and the centralizer front end shell.

5. The pipe inner diameter axial triggering centralizer nipple of claim 1, wherein a sealing ring is arranged outside a front end shell of the centralizer.

6. The pipe inner diameter radial triggering centralizer nipple is used for a pipe with a small diameter structure, which comprises a plurality of pipe sections with equal length and same internal structure, wherein the small diameter structure with abrupt inner diameter is arranged between two adjacent pipe sections, and is characterized in that the pipe inner diameter radial triggering centralizer nipple comprises a connector socket, a proximity switch, a centralizer spring sheet, a triggering pin, a chute cover plate, a sliding column, a connector plug and a shell structure for fixing the whole nipple,

The centralizer spring plate and the chute cover plate are both positioned outside the shell structure, the number of the chute cover plates is multiple, the chute cover plates are all connected with the shell structure, each chute cover plate is provided with a chute for the sliding column to move, two ends of the centralizer spring plate are respectively and movably connected with the sliding cover plate through the sliding column, and the middle part of the centralizer spring plate is connected with a trigger pin;

The proximity switch is positioned at the inner side of the shell structure, the trigger pin penetrates through the shell structure and is opposite to the proximity switch, the proximity switch is respectively connected with the connector socket and the connector plug and is used for acquiring electric energy and transmitting contact signals, and the length of a pipeline is calculated according to the number of the contact signals and the length of a single pipe joint acquired in advance;

the number of the centralizer elastic pieces is one or more, each centralizer elastic piece corresponds to one proximity switch, if all the proximity switches are triggered, a contact signal at the moment is recorded, and otherwise, the contact signal is used as an invalid contact signal;

and a sealing ring is arranged outside one end of the shell structure, which is connected with the connector plug.

7. A multi-trigger centralizer nipple based on a pipe inner diameter axial trigger centralizer nipple according to claim 1, wherein the structure comprising the proximity switch, the switch trigger structure, the compression spring, the guide pin, the centralizer slider and the centralizer spring sheet in claim 1 is used as a trigger component;

The multi-trigger centralizer nipple is characterized by comprising a plurality of trigger assemblies, connector sockets, connector plugs and a shell structure for fixing the whole nipple, wherein the trigger assemblies are sequentially connected, the proximity switches in the trigger assemblies are respectively connected with the connector sockets and the connector plugs and are used for acquiring electric energy and transmitting contact signals, and the back pumping signals are judged and removed according to the contact signals and the connection sequence of the proximity switches, so that the pipeline length is calculated according to the number of the residual contact signals and the length of a single pipe joint acquired in advance.

8. A multi-trigger centralizer nipple based on a pipe inner diameter radial trigger centralizer nipple according to claim 6, wherein the structure comprising the proximity switch, the centralizer spring plate, the trigger pin, the chute cover plate and the sliding column in claim 6 is used as a trigger component;

The multi-trigger centralizer nipple is characterized by comprising a plurality of trigger assemblies, connector sockets, connector plugs and a shell structure for fixing the whole nipple, wherein the trigger assemblies are sequentially connected, the proximity switches in the trigger assemblies are respectively connected with the connector sockets and the connector plugs and are used for acquiring electric energy and transmitting contact signals, and the back pumping signals are judged and removed according to the contact signals and the connection sequence of the proximity switches, so that the pipeline length is calculated according to the number of the residual contact signals and the length of a single pipe joint acquired in advance.