Device and method for discriminating contact tightness of oil casing male buckle end and coupling sealing shoulder

Abstract

The invention relates to a device and a method for discriminating the contact tightness of an oil casing male buckle end and a coupling sealing shoulder, the discriminating device comprises a battery, two contact heads, two wire end contact heads and a wire disc, and one contact head, the battery and the other contact head are sequentially connected through a connecting wire; the two wire end contacts are fixedly installed on the two sides of one end of the wire disc respectively and are connected through a circuit, and the wire disc can move so that the two wire end contacts can be close to the two contacts to be attached to the two contacts respectively, or the two wire end contacts can be separated from the two contacts respectively. The device is simple in structure and reasonable in design, the contact tightness of the male buckle end of the oil casing and the coupling sealing shoulder is judged, and the overall sealing performance of the connector is not affected; in addition, wireless signal transmission is achieved, response is sensitive, the influence of screwing-on manual operation is avoided, long-distance transmission can be achieved, oil field on-site construction and use are facilitated, the device has important significance on safe construction of a downhole oil casing, and the device can be widely used and popularized in various large oil fields.

Description

Technical Field

[0001] The present invention relates to the technical field of oil casing sealing detection, and particularly to a device and method for judging the tight contact between the male end of an oil casing and the sealing shoulder of a coupling. Background Art

[0002] During the oilfield exploration and development process, oil casings are a large amount of materials used frequently, serving as channels for transporting oil, gas or mud. The length of an oil casing is about ten meters, and it is connected through the male end and the coupling, and finally forms an integral pipe string. In actual factory workshops or oilfield construction sites, it is difficult to determine whether the male end of the oil casing is in contact with the sealing shoulder of the coupling, which may lead to improper threading of the coupling and the sealing surface of the coupling being difficult to play a sealing role. Currently, there is no effective method to determine whether the male end of the oil casing is in tight contact with the sealing shoulder of the coupling.

[0003] If the male end of the oil casing is not in tight contact or not in contact with the sealing shoulder of the coupling, it is difficult to play a sealing role, which will cause leakage of gas or liquid in the pipeline, resulting in the failure of the oil casing seal. In severe cases, it will cause the male end and the coupling end to become unthreaded, and ultimately lead to the failure of the entire pipe string. Therefore, judging the contact situation between the male end of the oil casing and the sealing shoulder of the coupling and ensuring tight contact can ensure the safety of the oil casing pipe string and avoid the occurrence of pipe string leakage failure accidents. Summary of the Invention

[0004] The present invention provides a device and method for judging the tight contact between the male end of an oil casing and the sealing shoulder of a coupling, aiming to solve the problems in the prior art.

[0005] The technical solution of the present invention for solving the above technical problems is as follows:

[0006] A device for judging the tight contact between the male end of an oil casing and the sealing shoulder of a coupling includes a battery, two contact heads, two wire end contacts and a wire reel. One of the contact heads, the battery and the other contact head are sequentially connected through a connecting wire; the two wire end contacts are respectively fixedly installed on both sides of one end of the wire reel and are connected through a circuit, and the wire reel is movable so that the two wire end contacts can respectively approach the two contact heads until they are in contact, or the two wire end contacts can be separated from the two contact heads respectively.

[0007] The beneficial effect of the present invention is that during the judging process, the two contact heads and the battery are installed on the male end, and the two wire end contacts and the wire reel are installed on the sealing shoulder of the coupling. When threading, the sealing shoulder of the coupling drives the wire reel and the two wire end contacts to move until the two wire end contacts are respectively in contact with the two contact heads to form a closed circuit. At this time, it indicates that the male end is in tight contact with the sealing shoulder of the coupling, and the judgment is convenient.

[0008] The structure of the present invention is simple and reasonably designed, which can judge the tight contact between the male end of the oil casing and the sealing shoulder of the coupling without affecting the overall sealing performance of the joint. In addition, the wireless signal transmission is sensitive and not affected by the manual operation of screwing on. It can realize long-distance transmission, which is convenient for on-site construction in oil fields and is of great significance for the safe construction of downhole oil casings. It can be widely used and popularized in major oil fields.

[0009] On the basis of the above technical solutions, the present invention can be further improved as follows.

[0010] Furthermore, it further includes a control mechanism, on which there are a power switch and a line opening and closing signal transmitter, and the power switch is communicatively connected to the line opening and closing signal transmitter; it also includes a line opening and closing wireless signal receiver, which is fixedly installed on the two connecting wires to control the on-off of the connecting wires.

[0011] The beneficial effect of adopting the above further solution is that when judging, the power switch is turned on, and the line opening and closing signal transmitter emits signal M1. Signal M1 is received by the line opening and closing wireless signal receiver, and the switch in the line opening and closing wireless signal receiver closes; when screwing on, the sealing shoulder of the coupling drives the wire reel and the two wire end contacts to move until the two wire end contacts are respectively in contact with the two contact heads to form a closed circuit. At this time, it indicates that the male end is in tight contact with the sealing shoulder of the coupling, and the judgment is convenient.

[0012] Furthermore, it further includes a contact signal generator, which is fixedly installed on the connecting wire; a contact signal indicator light is also fixedly installed on the control mechanism, and the contact signal indicator light and the contact signal generator are respectively communicatively connected to the control mechanism.

[0013] The beneficial effect of adopting the above further solution is that when judging, after the closed circuit is formed, the contact signal generator emits signal M2. Signal M2 is received by the control mechanism, and the control mechanism controls the contact signal indicator light to turn on. At this time, it indicates that the male end is in tight contact with the sealing shoulder of the coupling, and the judgment is convenient.

[0014] Furthermore, it further includes a housing and a connecting block. There is a cavity in the housing, and one end of the housing is provided with an opening communicating with the cavity. The other end of the housing is used to connect the male end; the two contact heads are relatively fixedly installed in the cavity, the wire reel is located in the cavity and is between the contact head and the opening; the connecting block is slidably installed at the opening, one end of which is fixedly connected to the wire reel, and the other end extends outside the housing through the opening for connecting the sealing shoulder of the coupling.

[0015] The beneficial effects of adopting the above further scheme are that the structure is simple and the design is reasonable. Each component is assembled through the outer shell so as to assemble each component on the male buckle end, and the assembly is convenient.

[0016] Further, an end face cover is installed at the opening, and the end face cover seals the opening.

[0017] The beneficial effects of adopting the above further scheme are that the structure is simple and the design is reasonable. The opening is sealed by the end face cover to ensure the sealing performance of the outer shell.

[0018] Further, the outer shell and / or the connecting block are respectively in a columnar structure.

[0019] The beneficial effects of adopting the above further scheme are that the shape is regular and it will not affect the operation of each component.

[0020] Further, the connecting wire is inserted into the side wall of the outer shell.

[0021] The beneficial effects of adopting the above further scheme are that the structure is simple and the design is reasonable. It is safer to assemble the connecting wire in the outer shell.

[0022] Further, a return mechanism is installed in the cavity. The return mechanism is connected to the wire reel and is used to return the wire reel.

[0023] The beneficial effects of adopting the above further scheme are that after the buckling operation is completed, the wire reel can be automatically returned through the return mechanism. The return is convenient and time-saving and labor-saving.

[0024] Further, the return mechanism includes a support column. The support column is fixedly installed in the cavity and extends along the moving direction of the wire reel. One end of the support column penetrates through the wire reel and is slidably connected to the wire reel. A spring is sleeved on the support column. Two ends of the spring respectively abut against the wire reel and the inner wall of the cavity. An avoidance cavity is arranged in the connecting block, and one end of the support column extends into the avoidance cavity.

[0025] The beneficial effects of adopting the above further scheme are that when the buckling operation is completed, the spring is in a compressed state. At this time, the elastic force of the spring can be used to realize the automatic return of the wire reel. The return is convenient and time-saving and labor-saving.

[0026] The present invention also relates to a method for judging the tight contact between the male buckle of the oil casing and the sealing shoulder of the coupling, which is realized by using the device for judging the tight contact between the male buckle end of the oil casing and the sealing shoulder of the coupling as described above, and includes the following specific steps:

[0027] S1: Turn on the power switch. The line opening and closing signal transmitter transmits signal M1. Signal M1 is received by the line opening and closing wireless signal receiver, and the switch in the line opening and closing wireless signal receiver closes.

[0028] S2: The coupling is screwed onto the male end of the casing and tubing. When the two wire end connectors are in contact with the two contact heads respectively, it indicates that the end face of the male end is in full contact with the sealing shoulder of the coupling.

[0029] Meanwhile, the line opening and closing wireless signal receiver, the contact signal generator, the battery, the two contact heads and the two wire end connectors form a closed loop; and the contact signal generator emits signal M2, and signal M2 is received by the control mechanism, and the control mechanism controls the contact signal indicator light to turn on.

[0030] The beneficial effect of adopting the above further solution is that the present invention provides a method for judging the tight contact between the male end of the casing and tubing and the sealing shoulder of the coupling. This judging method is simple and reasonably designed, realizing the judgment of the tight contact between the male end of the casing and tubing and the sealing shoulder of the coupling, without affecting the overall sealing performance of the joint; in addition, wireless signal transmission, sensitive response, not affected by the manual operation of screwing, can realize long-distance transmission, is convenient for on-site construction in oil fields, and is of great significance for the safe construction of downhole casing and tubing, and can be widely used and promoted in major oil fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of the present invention when the closed loop is not formed;

[0032] Figure 2 is Figure 1 a cross-sectional view taken along the line A-A in

[0033] Figure 3 is Figure 1 a cross-sectional view taken along the line B-B in

[0034] Figure 4 is Figure 1 a cross-sectional view taken along the line C-C in

[0035] Figure 5 It is a schematic structural diagram of the present invention when the closed loop is formed;

[0036] Figure 6 It is a schematic structural diagram of the operating mechanism in the present invention;

[0037] Figure 7 It is a schematic structural diagram when the male end is screwed onto the sealing shoulder of the coupling in the present invention;

[0038] Figure 8 It is a schematic structural diagram when the judgment device is installed at the male end in the present invention;

[0039] Figure 9 It is a schematic structural diagram of the male end in the present invention.

[0040] In the drawings, the list of components represented by each reference numeral is as follows:

[0041] 1. Outer shell; 2. End face cover; 3. Connecting block; 4. Power switch; 5. Line opening and closing signal transmitter; 6. Wire reel; 7. Support pillar; 8. Spring; 9. Wire end contact; 10. Battery; 11. Contact signal generator; 12. Contact signal indicator light; 13. Connecting wire; 14. Contact head; 15. Line opening and closing wireless signal receiver; 16. Male buckle end; 17. Coupling pipe body; 18. Coupling sealing shoulder; 19. Control mechanism. Specific implementation manner

[0042] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0045] The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0046] Embodiment 1

[0047] As Figures 1 to 9As shown in the figure, this embodiment provides a device for judging the tight contact between the male end of the casing and the sealing shoulder of the coupling, which includes a battery 10, two contact heads 14, two wire end contacts 9 and a wire reel 6. One of the contact heads 14, the battery 10 and the other contact head 14 are sequentially connected through a connecting wire 13; the two wire end contacts 9 are respectively fixedly installed on both sides of one end of the wire reel 6 and are connected through a circuit, and the wire reel 6 can move so that the two wire end contacts 9 are respectively close to the two contact heads 14 until they fit, or the two wire end contacts 9 are separated from the two contact heads 14 respectively.

[0048] During the judgment process, the two contact heads 14 and the battery 10 are installed on the male end, and the two wire end contacts 9 and the wire reel 6 are installed on the sealing shoulder 18 of the coupling. When screwing on, the sealing shoulder 18 of the coupling drives the wire reel 6 and the two wire end contacts 9 to move until the two wire end contacts 9 respectively fit with the two contact heads 14 to form a closed circuit. At this time, it indicates that the male end 16 is in tight contact with the sealing shoulder 18 of the coupling, and the judgment is convenient.

[0049] Based on the above solution, the sealing shoulder 18 of the coupling is located at one end of the coupling pipe body 17.

[0050] Preferably, in this embodiment, the above-mentioned wire reel 6 is preferably a cylindrical structure with one end open and the other end closed, and the two wire end contacts 9 are respectively fixedly installed on both sides of the open end of the wire reel 6.

[0051] It should be noted that the above-mentioned battery 10, two contact heads 14 and two wire end contacts 9 all adopt existing technologies, and their specific structures and principles will not be elaborated here.

[0052] In addition, the above-mentioned battery 10 is preferably a rechargeable battery, or the battery is replaced regularly.

[0053] This embodiment has a simple structure and reasonable design, realizes the judgment of the tight contact between the male end of the casing and the sealing shoulder of the coupling, and does not affect the overall sealing performance of the joint; in addition, wireless signal transmission, sensitive response, not affected by the manual operation of screwing on, can realize long-distance transmission, is convenient for on-site construction in oil fields, and is of great significance to the safe construction of downhole casings, and can be widely used and promoted in major oil fields.

[0054] Embodiment 2

[0055] On the basis of Embodiment 1, this embodiment further includes a control mechanism 19, on which a power switch 4 and a line opening and closing signal transmitter 5 are provided, and the power switch 4 is communicatively connected to the line opening and closing signal transmitter 5; it also includes a line opening and closing wireless signal receiver 15, which is fixedly installed on the two connecting wires 13 to control the on and off of the connecting wires 13.

[0056] During discrimination, the power switch 4 is turned on, and the line opening and closing signal transmitter 5 transmits signal M1. Signal M1 is received by the line opening and closing wireless signal receiver 15, and the switch inside the line opening and closing wireless signal receiver 15 closes. When making up the connection, the coupling sealing shoulder 18 drives the wire reel 6 and the two wire end contacts 9 to move until the two wire end contacts 9 are respectively in contact with the two contact heads 14 to form a closed circuit. At this time, it indicates that the male thread end 16 is in close contact with the coupling sealing shoulder 18, and the discrimination is convenient.

[0057] It should be noted that the above-mentioned control mechanism 19 is equivalent to a control template, and the control mechanism 19, the line opening and closing signal transmitter 5, and the line opening and closing wireless signal receiver 15 respectively adopt existing technologies, and their specific structures and principles will not be elaborated here.

[0058] Embodiment 3

[0059] Based on Embodiment 2, this embodiment further includes a contact signal generator 11, and the contact signal generator 11 is fixed on the connecting wire 13; a contact signal indicator light 12 is also fixedly installed on the control mechanism 19, and the contact signal indicator light 12 and the contact signal generator 11 are respectively in communication connection with the control mechanism 19.

[0060] During discrimination, when a closed circuit is formed, the contact signal generator 11 transmits signal M2. Signal M2 is received by the control mechanism 19, and the control mechanism 19 controls the contact signal indicator light 12 to turn on. At this time, it indicates that the male thread end 16 is in close contact with the coupling sealing shoulder 18, and the discrimination is convenient.

[0061] It should be noted that the above-mentioned contact signal generator 11 and contact signal indicator light 12 respectively adopt existing technologies, and their specific structures and principles will not be elaborated here.

[0062] Embodiment 4

[0063] Based on the above embodiments, this embodiment further includes a housing 1 and a connecting block 3. The housing 1 is provided with a cavity inside, and one end of the housing 1 is provided with an opening communicating with the cavity. The other end of the housing 1 is used to connect the male thread end 16; the two contact heads 14 are relatively fixedly installed inside the cavity, the wire reel 6 is located inside the cavity and is between the contact heads 14 and the opening; the connecting block 3 is slidably installed at the opening, one end of which is fixedly connected to the wire reel 6, and the other end extends outside the housing 1 through the opening for connecting the coupling sealing shoulder 18.

[0064] This solution has a simple structure and reasonable design. Each component is assembled through the housing 1 so as to assemble each component on the male thread end 16, and the assembly is convenient.

[0065] Example 5

[0066] On the basis of Example 4, in this example, an end face cover 2 is installed at the opening, and the end face cover 2 seals the opening.

[0067] This solution has a simple structure and reasonable design. By sealing the opening with the end face cover 2, the sealing performance of the housing 1 is ensured.

[0068] Example 6

[0069] On the basis of any one of Examples 4 to 5, in this example, the housing 1 and / or the connecting block 3 are respectively in a columnar structure.

[0070] The shapes of the housing 1 and the connecting block 3 are regular and will not affect the operation of each component.

[0071] Based on the above solution, the above cavity is preferably a circular cavity.

[0072] In addition, the housing 1 and the connecting block 3 as a whole are in a cylindrical structure.

[0073] Example 7

[0074] On the basis of any one of Examples 4 to 6, in this example, the connecting wire 13 is inserted into the side wall of the housing 1.

[0075] This solution has a simple structure and reasonable design. The connecting wire 13 is assembled in the housing 1 more safely.

[0076] Based on the above solution, an installation cavity is provided on the side wall of the housing 1, and a through hole communicating with the installation cavity is provided on the side wall of the housing 1. A sealing cover is installed at the through hole in a closable manner.

[0077] In addition, the battery 10, the connecting wire 13, the contact signal generator 11 and the line opening and closing wireless signal receiver 15 are respectively installed in the above installation cavity.

[0078] Example 8

[0079] On the basis of any one of Examples 4 to 7, in this example, a return mechanism is installed in the cavity. The return mechanism is connected to the wire reel 6 and is used to return the wire reel 6.

[0080] After the buckling operation is completed, the wire reel 6 can be automatically returned through the return mechanism, which is convenient for returning, time-saving and labor-saving.

[0081] Example 9

[0082] On the basis of Embodiment 8, in this embodiment, the return mechanism includes a support column 7 which is fixedly installed in the cavity and extends along the moving direction of the wire reel 6; one end of the support column 7 penetrates through the wire reel 6 and is slidably connected to the wire reel 6, and a spring 8 is sleeved thereon. Two ends of the spring 8 are respectively abutted against the wire reel 6 and the inner wall of the cavity; an avoidance cavity is arranged in the connection block 3, and one end of the support column 7 extends into the avoidance cavity.

[0083] When the upper buckling operation is completed, the spring 8 is in a compressed state. At this time, the elastic force of the spring 8 can be used to realize the automatic return of the wire reel 6, which is convenient for returning, time-saving and labor-saving.

[0084] Embodiment 10

[0085] On the basis of the above embodiments, in this embodiment, a method for judging the tight contact between the male thread of the oil casing and the sealing shoulder of the coupling is characterized in that it is realized by using the device for judging the tight contact between the male end of the oil casing and the sealing shoulder of the coupling as described above, and includes the following specific steps:

[0086] S1: Turn on the power switch 4, the line opening and closing signal transmitter 5 transmits a signal M1, the signal M1 is received by the line opening and closing wireless signal receiver 15, and the switch in the line opening and closing wireless signal receiver 15 closes;

[0087] S2: Buckle the coupling and the male end 16 of the oil casing. When the two wire end joints 9 are respectively in contact with the two contact heads 14, it indicates that the end face of the male thread is in full contact with the sealing shoulder 18 of the coupling;

[0088] Meanwhile, the line opening and closing wireless signal receiver 15, the contact signal generator 11, the battery 10, the two contact heads 14 and the two wire end joints 9 form a closed loop; and the contact signal generator 11 transmits a signal M2, the signal M2 is received by the control mechanism, and the control mechanism controls the contact signal indicator light 12 to turn on.

[0089] Based on the above solution, the above signals M1 and M2 respectively represent signals with transmission frequencies of M1 and M2, and have no other substantial meanings.

[0090] In addition, the four points E, F, G, and H in Figure 9 correspond one-to-one with the four points E, F, G, and H in Figure 1 for convenient assembly. Here, E, F, G, and H only represent four corners and have no other substantial meanings.

[0091] This embodiment provides a method for judging the tight contact between the male thread end of the casing and the sealing shoulder of the coupling. This judging method is simple and reasonably designed, which can realize the judgment of the tight contact between the male thread end of the casing and the sealing shoulder of the coupling without affecting the overall sealing performance of the joint. In addition, the wireless signal transmission is sensitive and not affected by the manual operation of screwing. It can realize long-distance transmission, which is convenient for the construction of oil fields. It is of great significance to the safe construction of the casing in the well and can be widely used and promoted in major oil fields.

[0092] The working principle of the present invention is as follows:

[0093] S0: A cylindrical hole EFGH (see the appendix Figure 1 ) is machined on the end face of the male thread end 16, and the outer shell 1 is assembled in the cylindrical hole;

[0094] S1: Turn on the power switch 4, the line opening and closing signal transmitter 5 emits a signal M1, and the signal M1 is received by the line opening and closing wireless signal receiver 15, and the switch in the line opening and closing wireless signal receiver 15 closes;

[0095] S2: Use a make-up machine to make up the coupling and the male thread end 16 of the casing. When the two wire end joints 9 are in contact with the two contact heads 14 respectively, it indicates that the end face of the male thread end is in full contact with the sealing shoulder 18 of the coupling;

[0096] At the same time, the line opening and closing wireless signal receiver 15, the contact signal generator 11, the battery 10, the two contact heads 14 and the two wire end joints 9 form a closed loop; and the contact signal generator 11 emits a signal M2, and the signal M2 is received by the control mechanism, and the control mechanism controls the contact signal indicator light 12 to light up;

[0097] S3: After the contact signal indicator light 12 lights up, make up to the required torque value, and then stop making up. Press the power switch 4. At this time, the line opening and closing signal transmitter 5 does not emit the signal M1, the switch of the line opening and closing wireless receiver 15 disconnects, and the contact signal indicator light 12 goes out.

[0098] It should be noted that the length L of the protruding part of the connecting block 3 is equal to the distance L1 between the wire end contact 9 and the contact head in the cavity (see Figure 1 ).

[0099] The discriminant device and method for the tight contact between the male end of the oil casing and the sealing shoulder of the coupling of the present invention can determine the contact situation between the male end of the oil casing and the sealing shoulder of the coupling, so as to ensure the tightness of the connection between the male end of the oil casing and the coupling and ensure the sealing performance. If it is found that the male end of the oil casing does not contact the sealing shoulder of the coupling, the make-up situation can be adjusted in time, and the make-up torque can be increased until full contact is achieved. This can avoid seal failure caused by poor sealing performance, and even the failure of the entire oil casing string, reducing the occurrence of drilling or oil production operation accidents and property losses.

[0100] In summary, the present invention improves the sealing performance of the oil casing, enhances the safety of downhole operations, and avoids the failure of the casing string and accidents caused by poor sealing due to the non-contact between the male end of the oil casing and the shoulder of the coupling. The required equipment is simple, the economic cost is low, the reliability is high, and it is convenient for large-scale promotion and use in oil fields and enterprises.

[0101] It should be noted that all the electronic components involved in the present invention adopt existing technologies, and the above-mentioned components are electrically connected to each other, and the control circuits between the components are existing technologies.

[0102] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0103] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0104] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Discrimination device for the tight contact between the male end of the tubing-casing and the sealing shoulder of the coupling, Characterized in that: It includes a battery (10), two contact heads (14), two wire end contacts (9) and a wire reel (6). One of the contact heads (14), the battery (10) and the other contact head (14) are sequentially connected through a connecting wire (13); the two wire end contacts (9) are respectively fixedly installed on both sides of one end of the wire reel (6) and are connected through a circuit, and the wire reel (6) is movable so that the two wire end contacts (9) respectively approach the two contact heads (14) until they fit, or the two wire end contacts (9) are separated from the two contact heads (14) respectively.

2. The discrimination device for the tight contact between the male end of the tubing-casing and the sealing shoulder of the coupling according to claim 1, Characterized in that: It further includes a control mechanism (19). A power switch (4) and a circuit opening and closing signal transmitter (5) are provided on the control mechanism (19). The power switch (4) is communicatively connected to the circuit opening and closing signal transmitter (5); it further includes a circuit opening and closing wireless signal receiver (15). The circuit opening and closing wireless signal receiver (15) is fixedly installed on the two connecting wires (13) to control the on and off of the connecting wires (13).

3. The discrimination device for the tight contact between the male end of the tubing-casing and the sealing shoulder of the coupling according to claim 2, Characterized in that: It further includes a contact signal generator (11). The contact signal generator (11) is fixed on the connecting wire (13); a contact signal indicator light (12) is also fixedly installed on the control mechanism (19). The contact signal indicator light (12) and the contact signal generator (11) are respectively communicatively connected to the control mechanism (19).

4. The discrimination device for the tight contact between the male end of the tubing-casing and the sealing shoulder of the coupling according to any one of claims 1-3, Characterized in that: It further includes a housing (1) and a connecting block (3). A cavity is provided inside the housing (1), and an opening communicating with the cavity is provided at one end of the housing (1). The other end of the housing (1) is used to connect to the male end (16); the two contact heads (14) are relatively fixedly installed inside the cavity. The wire reel (6) is located inside the cavity and is located between the contact heads (14) and the opening; the connecting block (3) is slidably installed at the opening. One end of it is fixedly connected to the wire reel (6), and the other end extends outside the housing (1) through the opening for connecting to the sealing shoulder of the coupling (18).

5. The discrimination device for the tight contact between the male end of the tubing-casing and the sealing shoulder of the coupling according to claim 4, Characterized in that: An end face cover (2) is installed at the opening, and the end face cover (2) seals the opening.

6. The discrimination device for the tight contact between the male end of the tubing-casing and the sealing shoulder of the coupling according to claim 4, Characterized in that: The housing (1) and / or the connecting block (3) are respectively in a columnar structure.

7. The discriminant device for the tight contact between the male end of the casing and tubing and the sealing shoulder of the coupling, according to claim 4, characterized in that: The connecting wire (13) is inserted into the side wall of the housing (1).

8. The discriminant device for the tight contact between the male end of the casing and tubing and the sealing shoulder of the coupling, according to claim 4, characterized in that: A return mechanism is installed in the cavity, and the return mechanism is connected to the wire reel (6) for returning the wire reel (6).

9. The discriminant device for the tight contact between the male end of the casing and tubing and the sealing shoulder of the coupling, according to claim 8, characterized in that: The return mechanism includes a support column (7), the support column (7) is fixedly installed in the cavity and extends along the moving direction of the wire reel (6); one end of the support column (7) penetrates through the wire reel (6) and is slidably connected to the wire reel (6), and a spring (8) is sleeved thereon. The two ends of the spring (8) are respectively abutted against the wire reel (6) and the inner wall of the cavity; an avoidance cavity is provided in the connecting block (3), and one end of the support column (7) extends into the avoidance cavity.

10. A method for discriminating the tight contact between the male thread of the casing and tubing and the sealing shoulder of the coupling, characterized in that, It is realized by using the discriminant device for the tight contact between the male end of the casing and tubing and the sealing shoulder of the coupling according to any one of claims 3-9, and includes the following specific steps: S1: Turn on the power switch (4), the line opening and closing signal transmitter (5) transmits a signal M1, the signal M1 is received by the line opening and closing wireless signal receiver (15), and the switch in the line opening and closing wireless signal receiver (15) closes; S2: Make the connection between the coupling and the male end (16) of the casing and tubing. When the two wire end connectors (9) are respectively in contact with the two contact heads (14), it indicates that the end face of the male end is in full contact with the sealing shoulder (18) of the coupling; Meanwhile, the line opening and closing wireless signal receiver (15), the contact signal generator (11), the battery (10), the two contact heads (14) and the two wire end connectors (9) form a closed loop; and the contact signal generator (11) transmits a signal M2, the signal M2 is received by the control mechanism, and the control mechanism controls the contact signal indicator light (12) to light up.

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