Oilfield electric water injection tool stroke sensor

[0017] Combine below figure 1 , figure 2 , image 3 with Figure 4 , To further explain the present invention:

[0018] Because all the stroke sensors in the prior art cannot be used on the existing oilfield electric water injection tools due to structural reasons, the focus of the invention is to conveniently install the stroke sensor on the oilfield electric water injection tool stroke sensor, and can Realize accurate stroke control and valve position feedback of water distribution valves in oilfield water injection tools.

[0019] To achieve this objective, the present invention includes a sensor body 1, which is a cuboid structure housing with a window 11 on the upper end surface. This structure housing is easier to install. A lead screw transmission device is provided in the sensor body, the lead screw 2 of the lead screw transmission device extends out of the sensor body 1, and a driven gear 4 is provided on the lead screw extending out of the sensor body. , The driven gear is fixed on the lead screw by a nut 5. The driven gear 4 meshes with the driving gear on the electric water injection tool of the oil field. Therefore, the power of the present invention comes from the oil field electric water injection tool, and first realizes the mechanical connection with the oil field electric water injection tool.

[0020] A stroke sensor circuit board 8 is provided on the upper end surface of the sensor body 1, and the stroke sensor circuit board 8 is connected to a power source by wires and feeds back signals. In this embodiment, the stroke sensor circuit board 8 is fixed on the upper end surface of the sensor body 1 with screws 9 through the mounting screw holes, and three wires are led out from the stroke sensor circuit board 8, two of which are power cords and one for power supply For the positive pole, one is the ground wire; the other is the signal wire, which is connected to the control system of the electric water injection tool in the oil field.

[0021] In this embodiment, the lead screw transmission device includes a lead screw 2 and a lead screw nut 6; in order to be able to accurately sense stroke change information, the lead screw nut 6 is a rectangular parallelepiped structure with a central screw hole. The upper surface of the screw nut 6 is provided with a groove, a magnet 7 is arranged in the groove, the groove is a rectangular groove, and the magnet 7 is a rectangular parallelepiped with an arc-shaped upper surface. magnet.

[0022] An adhesive layer is arranged between the magnet 7 and the groove, so that the magnet can be more firmly fixed in the groove. The magnet 7 described in this embodiment can be a permanent magnet.

[0023] A circlip 3 for limiting the axial position of the lead screw is provided in the sensor body 1 near one end of the driven gear, so that the axial position of the lead screw can be effectively limited.

[0024] In order to facilitate the installation of the present invention in the electric water injection tool of the oil field, the lower end surface of the sensor body 1 is provided with an outwardly turned fixed edge 11 with a fixed screw hole 10. The present invention can be directly fixed on the electric water injection tool of the oil field by passing the screw through the fixing screw hole 10. Such as Figure 4 Shown in: the present invention is fixed on the main body 16 of the oil field electric water injection tool through the mounting screw hole 14 on the oil field electric water injection tool and the fixing hole 10 of the present invention. The driving gear 13 of the oil field electric water injection tool main body 16 is connected with the slave of the present invention. The driving gear 4 meshes. When the driving wheel 13 rotates, the driven gear 4 is driven to rotate together, and the driven gear drives the screw 2 to rotate, driving the screw nut 6 and the magnetic block 7 on it to move axially along the screw. At this time, the sensing element on the sensor circuit board 8 can perceive the change of the magnetic field, and the position of the screw nut 6 can be determined through the signal of the sensor feedback circuit to complete the accurate stroke control and valve position feedback of the water distribution valve in the oil field water injection tool.