Abstract: A shift register and a display panel. The shift register includes an output adjustment module, a trigger write module, and a node adjustment module. A first terminal of the output adjustment module inputs a first clock signal. A second terminal of the output adjustment module inputs a first power signal. The output adjustment module is configured to adjust the shift register to output the first clock signal or the first power signal according to the signal on a first control node and the signal on a second control node of the output adjustment module. The trigger write module is configured to write a trigger signal to the second control node according to the clock signal of the control terminal of the trigger write module. The node adjustment module is configured to adjust the signal on the first control node.

Abstract: A shift register and a display panel. The shift register includes an output adjustment module, a trigger write module, and a node adjustment module. A first terminal of the output adjustment module inputs a first clock signal. A second terminal of the output adjustment module inputs a first power signal. The output adjustment module is configured to adjust the shift register to output the first clock signal or the first power signal according to the signal on a first control node and the signal on a second control node of the output adjustment module. The trigger write module is configured to write a trigger signal to the second control node according to the clock signal of the control terminal of the trigger write module. The node adjustment module is configured to adjust the signal on the first control node.

Abstract: A device for handling oil pipes and a method for workover includes a base, which includes an oil pipe bearing area extending in a longitudinal direction, the oil pipe bearing area being provided therein with at least one positioning member arranged in a transverse direction perpendicular to the longitudinal direction of the base, for positioning an oil pipe; and a movable oil pipe grasping assembly, which is located above the base and configured to grasp the oil pipe and place the oil pipe in the oil pipe bearing area, or grasp the oil pipe from the oil pipe bearing area and place the oil pipe in an area outside the oil pipe bearing area. The device for handling oil pipes provided by the present disclosure is able to achieve automatic handling of oil pipes, thereby decreasing labor intensity of operators, and improving working efficiency and safety factors of the work.

Abstract: An apparatus for tripping oil pipe and a system for automatic well workover comprises an elevator transfer device for transferring an elevator connected with an oil pipe, the elevator transfer device being structured for enabling continuous, automatic tripping operations of the oil pipe. The elevator transfer device comprises a lifting assembly used for lifting and releasing an oil pipe engaged with the elevator, and an elevator transport assembly used for transferring an elevator at a wellhead and/or an elevator on the lifting assembly. The apparatus for tripping oil pipe can lower the labor intensity and improve operation safety.

Abstract: A device for handling oil pipes and a method for workover includes a base, which includes an oil pipe bearing area extending in a longitudinal direction, the oil pipe bearing area being provided therein with at least one positioning member arranged in a transverse direction perpendicular to the longitudinal direction of the base, for positioning an oil pipe; and a movable oil pipe grasping assembly, which is located above the base and configured to grasp the oil pipe and place the oil pipe in the oil pipe bearing area, or grasp the oil pipe from the oil pipe bearing area and place the oil pipe in an area outside the oil pipe bearing area. The device for handling oil pipes provided by the present disclosure is able to achieve automatic handling of oil pipes, thereby decreasing labor intensity of operators, and improving working efficiency and safety factors of the work.

Abstract: An apparatus for tripping oil pipe and a system for automatic well workover comprises an elevator transfer device for transferring an elevator connected with an oil pipe, the elevator transfer device being structured for enabling continuous, automatic tripping operations of the oil pipe. The elevator transfer device comprises a lifting assembly used for lifting and releasing an oil pipe engaged with the elevator, and an elevator transport assembly used for transferring an elevator at a wellhead and/or an elevator on the lifting assembly. The apparatus for tripping oil pipe can lower the labour intensity and improve operation safety.