Overcurrent rotating nipple

Abstract

The utility model discloses an over-current rotating nipple, which relates to the technical field of rotating nipples and comprises a main body, a middle joint and a shaft sleeve which are sequentially connected from top to bottom, a rotating shaft is rotatably mounted in inner cavities of the main body, the middle joint and the shaft sleeve, and two first bearings and two second bearings are sleeved on the rotating shaft; an over-current assembly is arranged in the inner cavities of the main body and the rotating shaft, the over-current assembly comprises a single-core jack, a first pressure-bearing sealing element, a double jack, a second pressure-bearing sealing element and a conducting rod which are sequentially connected from top to bottom, and the first pressure-bearing sealing element and the second pressure-bearing sealing element can relatively rotate through the double jack; the device rotates stably and flexibly, and torsion force transmitted by the coiled tubing and a cable in the tubing can be released to the maximum extent under the cooperation of the double jacks; and the double jacks, the ceramic pressure-bearing sealing element and the conducting rod mechanism are designed, so that the insulation stability is high, and the stability of electric signal transmission is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of rotating short section technology, specifically to an electrically powered rotating short section. Background Technology

[0002] With the exploration and development of oil and gas fields, the use of coiled tubing perforation and instrument delivery operations has increased in shale oil deep wells, large-angle wells, and horizontal wells with large reach. Existing rotary subs with balancing structures are prone to pressure imbalance in the instrument due to bladder rupture or jamming of the balancing piston, which causes the rotary seal to fail. This results in the instrument being damaged by external media seeping into it, causing the sub to malfunction, poor circuit contact, and insulation failure, which greatly increases production costs.

[0003] Therefore, there is an urgent need to develop a new type of electrically driven rotary sub with flexible rotation and stable electrical signal transmission. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an electrically operated rotating short section.

[0005] The technical solution of this utility model is: an electrically rotatable short section, comprising a main body, a middle connector and a bushing connected sequentially from top to bottom, wherein a rotating shaft is rotatably installed in the inner cavity of the main body, the middle connector and the bushing, and a plurality of first bearings and a plurality of second bearings are fitted on the rotating shaft, wherein the plurality of first bearings are located between the main body and the rotating shaft, and the plurality of second bearings are located between the middle connector and the bushing;

[0006] The main body and the inner cavity of the rotating shaft are equipped with an overcurrent assembly. The overcurrent assembly includes a single-core socket, a first pressure-bearing seal, a double socket, a second pressure-bearing seal, and a conductive rod connected sequentially from top to bottom. The single-core socket is threaded into the main body and has an insulating seat inserted inside. The first pressure-bearing seal is threaded into the single-core socket, and its upper end pin is inserted into the insulating seat. The second pressure-bearing seal is threaded into the rotating shaft, and its lower part is fitted with an insulating pad, and its lower end pin is inserted into the conductive rod. The insulating pad contacts the upper end of the conductive rod, and the conductive rod is inserted into the rotating shaft. The first pressure-bearing seal and the second pressure-bearing seal can rotate relative to each other through the double socket.

[0007] Preferably, the first bearing is a ball bearing and the second bearing is a roller bearing.

[0008] Preferably, a piston and an oil injection plug are radially installed inside the main body, and the mounting cavities of the piston and the oil injection plug are both connected to the inner cavity of the main body. A vacuum oil plug is radially installed inside the bushing, and the mounting cavity of the vacuum oil plug is connected to the annulus between the bushing and the rotating shaft. An offset oil passage is provided on the rotating shaft, and the offset oil passage connects the inner cavity of the main body with the annulus between the bushing and the rotating shaft.

[0009] Preferably, both the first and second pressure-bearing seals are ceramic pressure-bearing seals.

[0010] Preferably, the dual-hole socket includes a socket body, elastic sleeves, and a protective tube. Both ends of the socket body are provided with insert sleeves adapted to the end pins of the first and second pressure-bearing seals. Each insert sleeve is divided into multiple segments. The two elastic sleeves are respectively fitted onto the insert sleeves at both ends of the socket body. The protective tube is fitted onto the outside of the socket body and the two elastic sleeves and is made of insulating material. The lower pin of the first pressure-bearing seal is inserted into the insert sleeve at the upper end of the socket body, and the upper pin of the second pressure-bearing seal is inserted into the insert sleeve at the lower end of the socket body.

[0011] Preferably, the protective tube is made of PEEK material.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] This device utilizes a balanced support mechanism composed of ball bearings, a rotating shaft, and roller bearings, which has a strong load-bearing capacity, optimizes the force distribution, and ensures smooth and flexible rotation. With the cooperation of the dual insertion holes, it can maximize the release of torsional forces transmitted by the coiled tubing and the cables inside the tubing. The piston can be driven by the pressure inside the wellbore and the oil pressure inside this rotating sub to quickly achieve internal and external pressure balance, ensuring the normal operation of this rotating sub. The electrical components are tightly connected, and the designed dual insertion hole + ceramic pressure-bearing seal + conductive rod mechanism has high insulation stability, effectively improving the stability of electrical signal transmission. Attached Figure Description

[0014] Figure 1 This is a half-sectional schematic diagram of the present invention;

[0015] Figure 2 This is a cross-sectional view of the present invention excluding the overcurrent component;

[0016] Figure 3 This is a cross-sectional view of the overcurrent component;

[0017] Figure 4 This is a cross-sectional view of the double-jack.

[0018] Figure 5 This is a schematic diagram of the main body of the socket;

[0019] Figure 6 This is a schematic diagram of the elastic sleeve structure;

[0020] Figure 7 This is a schematic diagram of the protective pipe structure.

[0021] In the diagram: 1. Main body, 2. Middle connector, 3. Bushing, 4. First bearing, 5. Second bearing, 6. Piston, 7. Oil filling plug, 8. Vacuum oil plug, 9. Offset oil passage, 10. Single-core socket, 11. Insulating seat, 12. First pressure-bearing seal, 13. Double socket, 1301. Socket body, 1302. Elastic sleeve, 1303. Protective tube, 14. Second pressure-bearing seal, 15. Insulating pad, 16. Conductive rod, 17. Rotating shaft, 18. Lower connector. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1

[0023] Reference Figure 1-3 As shown, an electrically operated rotating joint includes a main body 1, a central connector 2, and a bushing 3 connected sequentially from top to bottom. A rotating shaft 17 is rotatably mounted within the inner cavities of the main body 1, the central connector 2, and the bushing 3. Two first bearings 4 and two second bearings 5 ​​are mounted on the rotating shaft 17. The two first bearings 4 are located between the main body 1 and the rotating shaft 17, and the two second bearings 5 ​​are located between the central connector 2 and the bushing 3. More specifically, the first bearings 4 are ball bearings, and the second bearings 5 ​​are roller bearings.

[0024] In addition, a piston 6 and an oil plug 7 are installed radially inside the main body 1. The mounting cavities of the piston 6 and the oil plug 7 are connected to the inner cavity of the main body 1. A vacuum oil plug 8 is installed radially inside the bushing 3. The mounting cavity of the vacuum oil plug 8 is connected to the annulus between the bushing 3 and the rotating shaft 17. An offset oil passage 9 is provided on the rotating shaft 17. The offset oil passage 9 connects the inner cavity of the main body 1 with the annulus between the bushing 3 and the rotating shaft 17.

[0025] The inner cavity of the main body 1 and the rotating shaft 17 is equipped with an overcurrent assembly. The overcurrent assembly includes a single-core socket 10, a first pressure-bearing seal 12, a double socket 13, a second pressure-bearing seal 14, and a conductive rod 16 connected from top to bottom. The single-core socket 10 is threaded into the main body 1, and an insulating seat 11 is inserted inside it. The first pressure-bearing seal 12 is threaded into the single-core socket 10, and its upper end pin is inserted into the insulating seat 11. The second pressure-bearing seal 14 is threaded into the rotating shaft 17, and an insulating pad 15 is fitted on its lower part. Its lower end pin is inserted into the conductive rod 16. The insulating pad 15 contacts the upper end of the conductive rod 16, and the conductive rod 16 is inserted into the rotating shaft 17. The first pressure-bearing seal 12 and the second pressure-bearing seal 14 can rotate relative to each other through the double socket 13.

[0026] More specifically, both the first pressure-bearing seal 12 and the second pressure-bearing seal 14 are ceramic pressure-bearing seals, and both have multiple sealing rings fitted on their outer sides.

[0027] After assembly, connect the vacuum connector to the vacuum plug 8, start the motor to create a negative pressure inside the rotating sub, then connect the oil injection head to the oil injection plug 7, and start the oil injection pump to fill the internal cavity of the rotating sub with oil. During the well run-in process, the piston 6 is pushed by the wellbore pressure and the oil pressure inside the rotating sub to quickly achieve internal and external pressure balance, ensuring the normal operation of the rotating sub; in addition, the oil inside the rotating sub can also lubricate the first bearing 4 and the second bearing 5.

[0028] In use, the coiled tubing is connected to the upper end of the main body 1 of this rotating section via the motor head assembly. The rotating shaft 17 of this rotating section is connected to the perforating gun (or other logging instruments) via the lower connector 18. The cable inside the coiled tubing is connected to the upper pin of the first pressure-bearing seal 12. When the coiled tubing is raised or lowered, it moves within the wellbore and is affected by factors such as fluid dynamics, gravity, friction, and temperature within the wellbore, resulting in rotation or vibration. The cable inside the coiled tubing also moves accordingly. This rotating section releases the torsional force, preventing it from being transmitted to the perforating gun (or other logging instruments): supported by ball bearings and roller bearings, the outer main body 1, the middle connector 2, and the bushing 3 rotate relative to the inner rotating shaft 17, releasing the torsional force of the coiled tubing; the first pressure-bearing seal 12 and the second pressure-bearing seal 14 of the internal electrical components rotate relative to each other through the double connector 13, releasing the torsional force of the cable inside the coiled tubing. Example 2

[0029] As a preferred embodiment of this utility model, this embodiment designs the dual socket 13 based on Embodiment 1, specifically as follows:

[0030] Reference Figure 4-7 As shown, the double socket 13 includes a socket body 1301, an elastic sleeve 1302, and a protective tube 1303. Both ends of the socket body 1301 are provided with insert sleeves that are adapted to the end pins of the first pressure-bearing seal 12 and the second pressure-bearing seal 14. Each insert sleeve is divided into four parts. The two elastic sleeves 1302 are respectively fitted onto the insert sleeves at both ends of the socket body 1301. The protective tube 1303 is fitted onto the outside of the socket body 1301 and the two elastic sleeves 1302, and it is made of insulating material. The lower end pin of the first pressure-bearing seal 12 is inserted into the insert sleeve at the upper end of the socket body 1301, and the upper end pin of the second pressure-bearing seal 14 is inserted into the insert sleeve at the lower end of the socket body 1301.

[0031] More specifically, to ensure insulation, the 1303 sheath is made of PEEK material.

[0032] Since the insert is divided into multiple segments and the elastic sleeve 1302 is fitted onto the insert, the inner wall of the insert and the end pin of the pressure-bearing seal always remain in contact, ensuring stable transmission of electrical signals without affecting the relative rotation of the insert and the pin.

[0033] In summary, this device utilizes a balanced support mechanism composed of ball bearings, a rotating shaft 17, and roller bearings, which has strong load-bearing capacity, optimized force distribution, and smooth and flexible rotation. With the cooperation of the double insertion holes 13, it can maximize the release of torsional force transmitted by the coiled tubing and the cable inside the tubing. The piston 6 is driven by the pressure inside the wellbore and the oil pressure inside this rotating sub to quickly achieve internal and external pressure balance, ensuring the normal operation of this rotating sub. The electrical components are tightly connected, and the designed double insertion hole 13 + ceramic pressure-bearing seal + conductive rod 16 mechanism has high insulation stability, effectively improving the stability of electrical signal transmission.

[0034] 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. An electrically operated rotating sub, characterized in that: It includes a main body, a middle connector and a bushing connected from top to bottom. A rotating shaft is rotatably installed in the inner cavity of the main body, the middle connector and the bushing. Multiple first bearings and multiple second bearings are fitted on the rotating shaft. The multiple first bearings are located between the main body and the rotating shaft, and the multiple second bearings are located between the middle connector and the bushing. The main body and the inner cavity of the rotating shaft are equipped with an overcurrent assembly. The overcurrent assembly includes a single-core socket, a first pressure-bearing seal, a double socket, a second pressure-bearing seal, and a conductive rod connected sequentially from top to bottom. The single-core socket is threaded into the main body and has an insulating seat inserted inside. The first pressure-bearing seal is threaded into the single-core socket, and its upper end pin is inserted into the insulating seat. The second pressure-bearing seal is threaded into the rotating shaft, and its lower part is fitted with an insulating pad, and its lower end pin is inserted into the conductive rod. The insulating pad contacts the upper end of the conductive rod, and the conductive rod is inserted into the rotating shaft. The first pressure-bearing seal and the second pressure-bearing seal can rotate relative to each other through the double socket.

2. The electrically operated rotating sub according to claim 1, characterized in that: The first bearing is a ball bearing, and the second bearing is a roller bearing.

3. The electrically operated rotating sub-section according to claim 1, characterized in that: A piston and an oil injection plug are installed radially inside the main body. The mounting cavities of the piston and the oil injection plug are connected to the inner cavity of the main body. A vacuum oil plug is installed radially inside the bushing. The mounting cavity of the vacuum oil plug is connected to the annulus between the bushing and the rotating shaft. An offset oil passage is provided on the rotating shaft. The offset oil passage connects the inner cavity of the main body with the annulus between the bushing and the rotating shaft.

4. The electrically operated rotating sub-section according to claim 1, characterized in that: Both the first and second pressure-bearing seals are ceramic pressure-bearing seals.

5. The electrically operated rotating sub-section according to claim 1, characterized in that: The dual-socket assembly includes a socket body, elastic sleeves, and a protective tube. Both ends of the socket body are provided with sockets that are adapted to the pins at the ends of the first and second pressure-bearing seals. Each socket is divided into multiple segments. The two elastic sleeves are respectively fitted onto the sockets at both ends of the socket body. The protective tube is fitted onto the outside of the socket body and the two elastic sleeves and is made of insulating material. The lower pin of the first pressure-bearing seal is inserted into the socket at the upper end of the socket body, and the upper pin of the second pressure-bearing seal is inserted into the socket at the lower end of the socket body.

6. The electrically operated rotating sub according to claim 5, characterized in that: The protective tube is made of PEEK material.

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