Overcurrent damping nipple for coiled tubing

Abstract

The utility model discloses an over-current shock-absorbing pup joint for coiled tubing, which relates to the technical field of shock-absorbing pup joints and comprises an upper joint and a protective shell which are connected up and down, a lower joint is mounted in the protective shell in an up-down sliding manner, and a step seat is arranged on the lower side of the inner wall of the protective shell; the lower joint penetrates through the step seat, and the upper end of the lower joint is provided with a locking nut through threads; a first spring and a second spring are arranged in the protective shell on the upper side of the step seat, the upper and lower ends of the first spring are respectively supported at the lower end of the upper joint and the top surface of the locking nut, the second spring sleeves the lower joint, and the upper and lower ends of the second spring are respectively supported at the bottom surface of the locking nut and the top surface of the step seat; an auxiliary operation hole for adjusting the locking nut is formed in the protective shell on one side of the locking nut; according to the damping device, the combination of the two springs with different strengths and the locking nut is adopted, the damping effect is guaranteed, the position of the locking nut can be adjusted through the auxiliary operation hole, and therefore deformation of the first spring and the second spring is changed, shock force with different magnitudes is weakened, and universality is improved.

Description

Technical Field

[0001] This utility model relates to the field of vibration damping short joint technology, specifically to an electrically damping short joint for continuous tubing. Background Technology

[0002] With the exploration and development of oil and gas fields, the use of coiled tubing perforation operations is increasing in deep shale oil wells, highly inclined wells, and horizontal wells with extended reach. This necessitates real-time evaluation of perforation performance during operations, requiring multi-parameter instruments such as depth calibration, magnetic positioning, temperature, and pressure monitoring to be deployed along with the perforating gun. Existing core damping subs often employ structures like rubber hoses and hydraulic push springs, which frequently suffer from hose failures and complex hydraulic structures that hinder maintenance. Furthermore, the transmission of electrical signals is often disrupted by broken connecting wires, damaging the instrument. Additionally, hydraulic damping subs, single-core damping subs with rubber hoses, and single-spring damping subs are only suitable for one type of instrument or perforating gun (each perforating gun model uses different perforating cartridges, resulting in varying impact forces), leading to poor versatility.

[0003] Therefore, there is an urgent need to develop a new type of shock-absorbing short joint. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an electrically damping short section for continuous tubing.

[0005] The technical solution of this utility model is: an over-electric vibration damping short section for continuous tubing, comprising an upper connector and a protective shell connected vertically. A lower connector is slidably installed inside the protective shell, and a stepped seat is provided on the lower side of its inner wall. Multiple axial sliding grooves are formed on the protective shell below the stepped seat. The lower connector passes through the stepped seat, and a locking nut is threaded onto its upper end. Multiple limiting pins corresponding to the sliding grooves are fixed in the middle of its outer wall. The limiting pins are slidably installed in the sliding grooves. A first spring and a second spring are provided inside the protective shell on the upper side of the stepped seat. The upper and lower ends of the first spring are respectively supported on the lower end of the upper connector and the top surface of the locking nut. The second spring is sleeved on the lower connector, and its upper and lower ends are respectively supported on the bottom surface of the locking nut and the top surface of the stepped seat. An auxiliary operating hole for adjusting the locking nut is formed on the protective shell on one side of the locking nut.

[0006] The upper connector, the protective shell, and the lower connector are equipped with an overcurrent assembly. The overcurrent assembly includes a first pressure-bearing sealing needle, a high-temperature wire, a second pressure-bearing sealing needle, and a conductive rod connected sequentially from top to bottom. The first pressure-bearing sealing needle is threadedly installed in the upper connector, and its lower end is connected to the upper end of the second pressure-bearing sealing needle via the high-temperature wire. The second pressure-bearing sealing needle is threadedly installed in the lower connector, and its lower end is inserted into the conductive rod. The conductive rod is inserted into the lower connector, and a wire sheath is provided in the annular space between the high-temperature wire and the first spring.

[0007] Preferably, the spring cavity of the protective shell is filled with silicone grease.

[0008] Preferably, both the first pressure-bearing sealing needle and the second pressure-bearing sealing needle are ceramic pressure-bearing sealing needles.

[0009] Preferably, an insulating sleeve is fitted on the outer side of the lower end of the first pressure-bearing sealing needle and the upper end of the second pressure-bearing sealing needle. A locking sleeve is fitted on the outer side of each of the two insulating sleeves. The two locking sleeves are threadedly connected to the first pressure-bearing sealing needle and the second pressure-bearing sealing needle, respectively. Multiple fixing pins for pressing the insulating sleeves are installed on both.

[0010] Preferably, an elastic pin assembly is installed at the bottom of the inner cavity of the lower connector. The elastic pin assembly includes a pin seat, a conductive rod seat, a third spring, and a lower pin. The conductive rod seat, the third spring, and the lower pin are all located in the inner cavity of the pin seat. The conductive rod seat is installed in the inner cavity of the pin seat and is inserted into the lower end of the conductive rod. The lower pin is slidably installed in the lower part of the inner cavity of the pin seat, and its upper end is connected to the lower end of the conductive rod seat through a high-temperature wire. The upper and lower ends of the third spring are respectively supported on the lower end of the conductive rod seat and the upper end of the lower pin.

[0011] Compared with the prior art, this utility model has the following advantages:

[0012] This device features a simple structure, high stability, and easy maintenance. The combination of two springs of different strengths and a locking nut ensures shock absorption while allowing adjustment of the locking nut's position via an auxiliary operating hole. This alters the deformation of the first and second springs, reducing impact forces of varying magnitudes and enhancing versatility. The overcurrent assembly utilizes a high-temperature wire with a protective sheath, ensuring stable electrical signal transmission. The elastic pin assembly's lower pin has elastic movement space, preventing pin ejection during perforation gun vibration and further guaranteeing stable electrical signal transmission. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a structural diagram of the high-temperature wire and its protective sheath.

[0015] Figure 3 This is a schematic diagram of the flexible pin assembly.

[0016] In the diagram: 1. Upper connector, 2. Sheath, 201. Slide groove, 202. Auxiliary operating hole, 3. Lower connector, 4. Stepped seat, 5. Locking nut, 6. Limiting pin, 7. First spring, 8. Second spring, 9. First pressure-bearing sealing pin, 10. High-temperature wire, 11. Second pressure-bearing sealing pin, 12. Conductive rod, 13. Wire sleeve, 14. Insulating sleeve, 15. Locking sleeve, 16. Elastic pin assembly, 1601. Pin seat, 1602. Conductive rod seat, 1603. Third spring, 1604. Lower pin. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1

[0018] Reference Figure 1-2 As shown, a type of electrically damping short section for continuous tubing includes an upper connector 1 and a protective shell 2 connected vertically. A lower connector 3 is slidably installed inside the protective shell 2. A stepped seat 4 is provided on the lower side of the inner wall of the lower connector 3, and two axial sliding grooves 201 are opened on the protective shell 2 below the stepped seat 4. The lower connector 3 passes through the stepped seat 4, and a locking nut 5 is threaded on its upper end. Two limiting pins 6, corresponding one-to-one with the sliding grooves 201, are fixed in the middle of its outer wall. The limiting pins 6 are slidably installed in the sliding grooves 201. A first spring 7 and a second spring 8 are provided in the protective shell 2 on the upper side of the stepped seat 4. The upper and lower ends of the first spring 7 are respectively supported on the lower end of the upper connector 1 and the top surface of the locking nut 5. The second spring 8 is sleeved on the lower connector 3, and its upper and lower ends are respectively supported on the bottom surface of the locking nut 5 and the top surface of the stepped seat 4. An auxiliary operating hole 202 for adjusting the locking nut 5 is opened on the protective shell 2 on one side of the locking nut 5. The position of the locking nut 5 is adjustable according to the model of the perforating gun it is used with. Adjustment is achieved by inserting a special tool through the auxiliary operating hole 202.

[0019] The upper connector 1, the protective shell 2, and the lower connector 3 are equipped with an overcurrent assembly. The overcurrent assembly includes a first pressure-bearing sealing needle 9, a high-temperature wire 10, a second pressure-bearing sealing needle 11, and a conductive rod 12 connected sequentially from top to bottom. The first pressure-bearing sealing needle 9 is threaded into the upper connector 1, and its lower end is connected to the upper end of the second pressure-bearing sealing needle 11 through the high-temperature wire 10. The second pressure-bearing sealing needle 11 is threaded into the lower connector 3, and its lower end is inserted into the conductive rod 12. The conductive rod 12 is inserted into the lower connector 3. A polytetrafluoroethylene (PTFE) insulated sheath 13 is provided in the annular space between the high-temperature wire 10 and the first spring 7. Its function is to support the first spring 7 on the one hand and protect the high-temperature wire 10 between the two pressure-bearing sealing needles on the other hand.

[0020] More specifically, both the first pressure-bearing sealing needle 9 and the second pressure-bearing sealing needle 11 are ceramic pressure-bearing sealing needles. Insulating sleeves 14 are fitted onto the outer sides of the lower end of the first pressure-bearing sealing needle 9 and the upper end of the second pressure-bearing sealing needle 11. Locking sleeves 15 are fitted onto the outer sides of both insulating sleeves 14. The two locking sleeves 15 are threadedly connected to the first pressure-bearing sealing needle 9 and the second pressure-bearing sealing needle 11, respectively. Multiple fixing pins for pressing the insulating sleeves 14 are installed on both.

[0021] In addition, the spring cavity of the protective shell 2 is filled with silicone grease for lubricating the spring.

[0022] Before going down into the well, first, according to the model of the perforating gun being matched, the position of the locking nut 5 is adjusted by inserting a special tool through the auxiliary operation hole 202; then, the upper end of the upper connector 1 is connected to the male connector of the logging instrument, and the lower end of the lower connector 3 is connected to the female connector of the perforating gun; during perforation operation, the lower connector 3 slides up and down inside the casing 2, and shock absorption is achieved by the first spring 7 and the second spring 8; with the connection of the high temperature wire 10, the first pressure-bearing sealing needle 9 and the second pressure-bearing sealing needle 11 are always connected, and at the same time, the wire sheath 13 can also protect the high temperature wire 10, ensuring the stability of electrical signal transmission.

[0023] This device has a simple structure, high stability, and is easy to maintain. The combination of two springs of different strengths and a locking nut 5 ensures the shock absorption effect and allows the position of the locking nut 5 to be adjusted through the auxiliary operating hole 202, thereby changing the deformation of the first spring 7 and the second spring 8, reducing the impact force of different magnitudes, and improving its versatility. The overcurrent component adopts a structure of high-temperature wire 10 and protective sleeve 13, which can ensure the stability of electrical signal transmission. Example 2

[0024] As a preferred embodiment of this utility model, this embodiment adds an elastic pin assembly 16 based on embodiment one, specifically as follows:

[0025] Reference Figure 3 As shown, an elastic pin assembly 16 is installed at the bottom of the inner cavity of the lower connector 3. The elastic pin assembly 16 includes a pin seat 1601, a conductive rod seat 1602, a third spring 1603, and a lower pin 1604. The conductive rod seat 1602, the third spring 1603, and the lower pin 1604 are all located in the inner cavity of the pin seat 1601. The conductive rod seat 1602 is installed in the inner cavity of the pin seat 1601 and is inserted into the lower end of the conductive rod 12. The lower pin 1604 is slidably installed in the lower part of the inner cavity of the pin seat 1601, and its upper end is connected to the lower end of the conductive rod seat 1602 through a high-temperature wire. The upper and lower ends of the third spring 1603 are respectively supported on the lower end of the conductive rod seat 1602 and the upper end of the lower pin 1604.

[0026] Because the lower pin 1604 has elastic movement space, there will be no pin ejection phenomenon when the perforating gun vibrates, which further ensures the stability of electrical signal transmission; when the lower pin 1604 is matched with other instrument sockets, there will be no problem of poor contact due to the socket being too short or too long.

[0027] This utility model is not limited to the above-described embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model, and the changed content still falls within the protection scope of this utility model.

Claims

1. A short, electrically damping joint for continuous tubing, comprising an upper connector and a protective shell connected vertically, characterized in that: A lower connector is slidably installed inside the housing. A stepped seat is provided on the lower side of the inner wall of the lower connector, and multiple axial grooves are formed on the housing below the stepped seat. The lower connector passes through the stepped seat, and a locking nut is threaded onto its upper end. Multiple limiting pins, corresponding one-to-one with the grooves, are fixed in the middle of its outer wall. The limiting pins are slidably installed within the grooves. A first spring and a second spring are provided inside the housing above the stepped seat. The upper and lower ends of the first spring are respectively supported by the lower end of the upper connector and the top surface of the locking nut. The second spring is sleeved on the lower connector, with its upper and lower ends respectively supported by the bottom surface of the locking nut and the top surface of the stepped seat. An auxiliary operating hole for adjusting the locking nut is provided on the housing on one side of the locking nut. The upper connector, the protective shell, and the lower connector are equipped with an overcurrent assembly. The overcurrent assembly includes a first pressure-bearing sealing needle, a high-temperature wire, a second pressure-bearing sealing needle, and a conductive rod connected sequentially from top to bottom. The first pressure-bearing sealing needle is threadedly installed in the upper connector, and its lower end is connected to the upper end of the second pressure-bearing sealing needle via the high-temperature wire. The second pressure-bearing sealing needle is threadedly installed in the lower connector, and its lower end is inserted into the conductive rod. The conductive rod is inserted into the lower connector, and a wire sheath is provided in the annular space between the high-temperature wire and the first spring.

2. The electrically damping short section for continuous tubing according to claim 1, characterized in that: The spring cavity of the protective shell is filled with silicone grease.

3. The electrically damping short section for coiled tubing according to claim 1, characterized in that: Both the first and second pressure-bearing sealing needles are ceramic pressure-bearing sealing needles.

4. The electrically damping short section for coiled tubing according to claim 1, characterized in that: Insulating sleeves are fitted on the outer sides of the lower end of the first pressure-bearing sealing needle and the upper end of the second pressure-bearing sealing needle. Locking sleeves are fitted on the outer sides of both insulating sleeves. The two locking sleeves are threadedly connected to the first pressure-bearing sealing needle and the second pressure-bearing sealing needle, respectively. Multiple fixing pins for pressing the insulating sleeves are installed on both.

5. The electrically damping short section for continuous tubing according to claim 1, characterized in that: A flexible pin assembly is installed at the bottom of the inner cavity of the lower connector. The flexible pin assembly includes a pin seat, a conductive rod seat, a third spring, and a lower pin. The conductive rod seat, the third spring, and the lower pin are all located in the inner cavity of the pin seat. The conductive rod seat is installed in the inner cavity of the pin seat and is inserted into the lower end of the conductive rod. The lower pin is slidably installed in the lower part of the inner cavity of the pin seat, and its upper end is connected to the lower end of the conductive rod seat through a high-temperature wire. The upper and lower ends of the third spring are respectively supported by the lower end of the conductive rod seat and the upper end of the lower pin.

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