Motor head assembly for perforation

Abstract

The utility model discloses a motor head assembly for perforation, which relates to the technical field of oil and gas exploitation equipment and comprises a halter nipple and an over-current one-way release nipple which are connected up and down, the over-current one-way release nipple comprises an over-current check valve component and a releasing component which are connected up and down, and two channels are arranged in the over-current check valve component. The two channels are an electricity passing channel and a liquid passing channel respectively; the releasing assembly comprises a releasing male connector and a releasing female connector which are vertically connected in an inserted mode, the releasing male connector and the releasing female connector are connected through a plurality of shear pins, a plurality of liquid passing hole channels are formed in the side wall of the releasing female connector in a circumferential array mode, and the liquid passing hole channels are communicated with an inner cavity of the releasing female connector. A nozzle is mounted in the shell; the device is a tool integrating a halter, a check valve, a safety release and a circulating nozzle, is compact in structure, and can provide stable signal transmission for a perforating gun and other instruments which are connected in a matched mode.

Description

Technical Field

[0001] This utility model relates to the technical field of oil and gas extraction equipment, specifically to a perforation motor head assembly. Background Technology

[0002] Traditional coiled tubing perforation operations typically employ motor head assemblies consisting of multiple independent tools (such as the motor head, check valve, mechanical release mechanism, and circulation stop) connected in series. This results in problems such as a lengthy tool string, high connection risks, and poor signal transmission stability. Motor head assemblies with check valves often employ a single-channel design, failing to balance cable overcurrent and fluid sealing. Furthermore, the fixed shear force of the safety release makes it difficult to adapt to different operating conditions. Currently, there is an urgent need for a highly integrated motor head assembly with coordinated functions to solve these problems. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a perforating motor head assembly.

[0004] The technical solution of this utility model is: a perforating motor head assembly, including a motor head short section and an over-electric one-way release short section connected vertically, wherein the over-electric one-way release short section includes an over-electric one-way valve assembly and a release assembly connected vertically.

[0005] The overcurrent single-flow valve assembly has dual channels, namely an overcurrent channel and a liquid channel; at least one single-flow valve is installed in the liquid channel; the release assembly includes a release male connector and a release female connector that are inserted vertically, and the release male connector and the release female connector are connected by multiple shear pins; the release female connector has multiple liquid channels arranged in a circumferential array on its side wall, and the liquid channels communicate with the inner cavity of the release female connector, and a nozzle is installed inside it.

[0006] Preferably, the overcurrent single-flow valve assembly includes an upper power connector and a protective shell connected vertically. The upper power connector is a cone with an inlet on its side wall that communicates with the liquid passage. The upper end of the overcurrent passage is located at the center of the upper end of the upper power connector. The single-flow valve is installed in the liquid passage of the protective shell, and the protective shell is connected to the release male connector.

[0007] Preferably, the stub of the cable head includes an upper connector, a compensating sleeve, an extended sleeve, a plug assembly, and a housing. The outer side of the upper connector is connected to the housing through the housing, and a connecting seat is fixed on its inner wall. The upper part of the compensating sleeve is located inside the connecting seat, and the two are threadedly connected with each other and a limiting screw is provided between them. The lower part of the sleeve is connected to a rotating assembly for breaking the cable torque. The extended sleeve is sleeved on the outside of the compensating sleeve and the rotating assembly. Its upper end is threadedly connected to the outer side of the connecting seat, and its lower end is connected to the upper end of the power connector and the upper end of the power passage inside it through the plug assembly.

[0008] Preferably, the one-way valve includes a valve base, a valve plate seat, and a valve plate. A sealing gasket with an annular groove is fitted at the lower step of the valve base. The upper end of the valve plate seat is fitted on the outside of the sealing gasket, and an arc-shaped opening is provided on the side wall of the valve plate seat. The valve plate is rotatably mounted on the upper end of the arc-shaped opening by a pin. One side of the valve plate is designed with a stepped groove that matches the annular groove, and the other side matches the arc-shaped opening. A torsion spring is fitted on the pin. During normal perforation operation, the stepped groove of the valve plate is engaged in the annular groove of the sealing gasket under the operation of the torsion spring.

[0009] Preferably, the male and female release connectors are provided with an equal number of upper and lower shear pins, the upper and lower shear pins are arranged in a circumferential array, and the upper and lower shear pins are staggered.

[0010] Preferably, the angle between the axis of the liquid passage and the axis of the release nut is 30°, and the inner port of the liquid passage is located on the lower end face of the inner cavity of the release nut.

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

[0012] This device integrates four tools into one unit: a faucet, a check valve, a safety release mechanism, and a circulating nozzle. Its compact structure provides stable signal transmission for connected perforating guns and other instruments. The overcurrent check valve assembly features dual channels, with the overcurrent channel and the liquid channel physically isolated, ensuring both cable overcurrent protection and fluid sealing. The number and position of shear pins installed in the release mechanism can be determined based on the load-bearing capacity of the tool string connected under different working conditions, enabling adjustable shearing force. Attached Figure Description

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

[0014] Figure 2 A schematic diagram of the structure of the horse's head short section;

[0015] Figure 3 This is a schematic diagram of the overcurrent single-flow valve assembly;

[0016] Figure 4 This is a schematic diagram of a check valve.

[0017] Figure 5 This is a structural diagram of the drop-hand component.

[0018] In the diagram: 1. Upper connector, 2. Connecting seat, 3. Compensating sleeve, 4. Limiting screw, 5. Rotating assembly, 6. Extended protective sleeve, 7. Plug assembly, 8. Housing, 9. Power connector, 10. Protective housing, 11. Power passage, 12. Liquid passage, 13. Check valve, 14. Release male connector, 15. Release female connector, 1501. Liquid passage, 16. Shear pin, 17. Nozzle, 18. Valve base, 19. Sealing gasket, 1901. Annular groove, 20. Valve plate seat, 2001. Arc-shaped opening, 21. Valve plate, 2101. Stepped groove, 22. Pin. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1

[0020] Reference Figure 1 , 2 As shown in Figures 3 and 5, a perforation motor head assembly includes a motor head section and an over-current one-way release section connected vertically. The over-current one-way release section includes an over-current one-way valve 13 assembly and a release assembly connected vertically.

[0021] The overcurrent check valve 13 assembly has dual channels: an overcurrent channel 11 and a liquid channel 12. Two check valves 13 are connected in series within the liquid channel 12. The release assembly includes a male release connector 14 and a female release connector 15 that are inserted vertically. Between the male and female release connectors 14 and 15, there are two equal numbers of upper and lower rings of shear pins 16. Both rings of shear pins 16 are arranged in a circumferential array and are staggered vertically; more specifically, each ring has six shear pins 16. The number and position of the shear pins 16 can be determined according to the load-bearing capacity of the tool string connected under different working conditions, thus achieving adjustable shearing force.

[0022] The drop-off female connector 15 has six liquid passages 1501 arranged in a circular array on its side wall. The liquid passages 1501 are connected to the inner cavity of the drop-off female connector 15, and nozzles 17 are installed inside them. More specifically, the angle between the axis of the liquid passage 1501 and the axis of the drop-off female connector 15 is 30°, and the inner port of the liquid passage 1501 is located on the lower end face of the inner cavity of the drop-off female connector 15.

[0023] The overcurrent check valve 13 assembly includes an overcurrent connector 9 and a protective housing 10 connected vertically. The overcurrent connector 9 is a cone with an inlet on its side wall that communicates with the liquid passage 12. The upper end of the overcurrent passage 11 is located at the center of the upper end of the overcurrent connector 9. The check valve 13 is installed inside the liquid passage 12 of the protective housing 10. The protective housing 10 is connected to the release male connector 14.

[0024] The cable head section includes an upper connector 1, a compensation sleeve 3, an extended sleeve 6, a plug assembly 7, and a housing 8. The outer side of the upper connector 1 is connected to the housing 10 through the housing 8, and a connecting seat 2 is fixed to its inner wall. The upper part of the compensation sleeve 3 is located inside the connecting seat 2, and the two are threaded together and a limit screw 4 is provided between them. The lower part of the sleeve is connected to a rotating assembly 5 for breaking the cable torque. The extended sleeve 6 is sleeved on the outside of the compensation sleeve 3 and the rotating assembly 5. Its upper end is threaded to the outer side of the connecting seat 2, and its lower end is connected to the upper end of the upper connector 9 and the upper end of the internal power passage 11 through the plug assembly 7.

[0025] Before going down into the well, connect the power supply components: the wire passes through the inner cavity of the release component and the power supply channel 11 from bottom to top, and its upper end is connected to the pin inside the plug component 7; pass the cable through the compensation sleeve 3 and the rotating component 5 in sequence, and then drive the cable to move through the compensation sleeve 3. When the lower end of the cable is connected to the pin inside the plug component 7, tighten the limit screw 4 to assemble the compensation sleeve 3 and the connecting seat 2 into one unit to prevent the compensation sleeve 3 from moving back and forth.

[0026] When the wellbore becomes blocked during downhole operation, the fluid pumped into the coiled tubing flows sequentially through the upper connector 1, the extended casing 6 and the annulus of the outer casing 8, the inlet, and the two check valves 13 before entering the inner cavity of the release assembly. It then flushes the wellbore through the nozzle 17. During other tests and perforation operations, the fluid in the wellbore cannot flow back into the coiled tubing through the check valves 13. In emergency situations such as jamming, the tool string is pulled up to cut the shear pin 16, allowing the tool string to be quickly detached from the release assembly.

[0027] This device integrates four tools into one unit: a faucet, a check valve 13, a safety release mechanism, and a circulating nozzle 17. Its compact structure provides stable signal transmission for the connected perforating gun and other instruments. The energized check valve 13 component has dual channels, with the energized channel 11 and the liquid channel 12 physically isolated, ensuring both cable energization and fluid sealing. The number and position of the shear pins 16 installed in the release mechanism can be determined according to the load-bearing capacity of the tool string connected under different working conditions, thus achieving adjustable shearing force. Example 2

[0028] As a preferred embodiment of this utility model, this embodiment designs the single-flow valve 13 based on Embodiment 1, specifically as follows:

[0029] Reference Figure 4As shown, the one-way valve 13 includes a valve base 18, a valve plate seat 20, and a valve plate 21. A sealing gasket 19 with an annular groove 1901 is fitted at the lower step of the valve base 18. The upper end of the valve plate seat 20 is fitted on the outside of the sealing gasket 19, and an arc-shaped opening 2001 is provided on the side wall of the valve plate seat 20. The valve plate 21 is rotatably mounted on the upper end of the arc-shaped opening 2001 by a pin 22. One side of the valve plate 21 is designed with a stepped groove 2101 that matches the annular groove 1901, and the other side matches the arc-shaped opening 2001. A fitting is provided on the pin 22. During normal perforation operations, the torsion spring causes the stepped groove 2101 of the valve plate 21 to engage with the annular groove 1901 of the sealing gasket 19, ensuring a tight seal. Fluid in the wellbore cannot enter the cavity of the power connector 9 and the manhole cover through the check valve 13. When flushing the wellbore is required, fluid is injected into the coiled tubing. Under the pressure of the pump truck, the fluid passes through the cavity of the manhole cover and the power connector 9, pushes open the valve plate 21 under pressure, passes through the cavity of the release male connector 14 and the release female connector 15, and flushes the wellbore through the nozzle 17.

[0030] 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 motor head assembly for perforation, characterized in that: It includes a short section for the horse's head connected vertically and a short section for overcurrent one-way release. The short section for overcurrent one-way release includes an overcurrent one-way valve assembly and a release assembly connected vertically. The overcurrent single-flow valve assembly has dual channels, namely an overcurrent channel and a liquid channel; at least one single-flow valve is installed in the liquid channel; the release assembly includes a release male connector and a release female connector that are inserted vertically, and the release male connector and the release female connector are connected by multiple shear pins; the release female connector has multiple liquid channels arranged in a circumferential array on its side wall, and the liquid channels communicate with the inner cavity of the release female connector, and a nozzle is installed inside it.

2. The perforation motor head assembly according to claim 1, characterized in that: The overcurrent single-flow valve assembly includes an upper power connector and a protective shell connected vertically. The upper power connector is a cone with an inlet on its side wall that communicates with the liquid passage. The upper end of the overcurrent passage is located at the center of the upper end of the upper power connector. The single-flow valve is installed in the liquid passage of the protective shell. The protective shell is connected to the release male connector.

3. The perforation motor head assembly according to claim 2, characterized in that: The stub of the cable includes an upper connector, a compensating sleeve, an extended sleeve, a plug assembly, and a housing. The outer side of the upper connector is connected to the housing through the housing, and a connecting seat is fixed on its inner wall. The upper part of the compensating sleeve is located inside the connecting seat, and the two are threaded together with a limiting screw between them. The lower part of the sleeve is connected to a rotating assembly for breaking the cable torque. The extended sleeve is sleeved on the outside of the compensating sleeve and the rotating assembly. Its upper end is threaded to the outer side of the connecting seat, and its lower end is connected to the upper end of the power connector and the upper end of the internal power passage through the plug assembly.

4. The perforation motor head assembly according to claim 2, characterized in that: The one-way valve includes a valve base, a valve plate seat, and a valve plate. A sealing gasket with an annular groove is fitted at the lower step of the valve base. The upper end of the valve plate seat is fitted on the outside of the sealing gasket, and an arc-shaped opening is provided on the side wall of the valve plate seat. The valve plate is rotatably mounted on the upper end of the arc-shaped opening by a pin. One side of the valve plate is designed with a stepped groove that matches the annular groove, and the other side matches the arc-shaped opening. A torsion spring is fitted on the pin. During normal perforation operation, the stepped groove of the valve plate is engaged in the annular groove of the sealing gasket under the operation of the torsion spring.

5. The perforation motor head assembly according to claim 1, characterized in that: The male and female connectors are provided with an equal number of upper and lower shear pins. The upper and lower shear pins are arranged in a circumferential array and are staggered.

6. The perforation motor head assembly according to claim 1, characterized in that: The angle between the axis of the liquid passage and the axis of the release nut is 30°, and the inner port of the liquid passage is located on the lower end face of the inner cavity of the release nut.

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