Novel large drift diameter hydraulic slip capable of achieving passive locking

Abstract

Provided is a novel large drift diameter hydraulic slip capable of achieving passive locking. One end of a hydraulic oil cylinder is connected with a slip body together through a lug plate and a pin shaft, the other end of the corresponding hydraulic oil cylinder is connected with a slip seat through a lug plate and a pin shaft, the slip bodies and slip teeth are connected, a linkage device is connected with the four slip bodies and the slip teeth into a whole component, a guide rail is connected with the slip seats, the slip seats are connected with guide blocks, the top of each guide block is pressed tightly through a small press plate, a guide rod is connected to each guide clock, and a centering device is connected to each slip seat. Two sets of hydraulic oil cylinders arranged symmetrically are mounted between the slip bodies and the slip seats. The surface of a guide groove in the guide rail is trapezoid. The outer surfaces of the guide blocks are wedge-shaped inclined faces. The drift diameter of the slip is increased by more than 40%, the slip can run stably and reliably in the whole process when the slip is mounted in both forward and reverse modes, and the service life of the oil cylinders and internal sealing pieces is long.

Description

technical field [0001] The invention relates to a novel large-diameter hydraulic power slip used for lifting and pressing down operations in oilfield operating equipment. Background technique [0002] Hydraulic power slips are the core components of oilfield operation equipment, mainly for clamping pipe strings, and are the key to safe and reliable operations in oilfields. [0003] At present, slips at home and abroad mainly have two structures: split type and slider type, both of which are passive locking types: that is, a small pre-tightening force is provided by the oil cylinder to drive the slips to clamp the pipe string, and then use the pipe string Its own weight drives the slips to slide along the guide slope to realize automatic locking, avoiding the damage to the pipe string caused by directly driving the slips vigorously to clamp the pipe string through the oil cylinder. The split type slips are usually only equipped with a horizontally arranged slip cylinder, an...

AI Technical Summary

Problems solved by technology

The split type slips are usually only equipped with a horizontally arranged slip cylinder, and the opening and closing of the four slips are controlled by the expansion and contraction at both ends of the cylinder. Since only one position at the top of the slips is connected to the slip cylinder, the slips The lower part of the teeth droops naturally by gravity, so the trajectory is unstable, the reliability is relatively low, and the alignment is poor. If the slips are installed in reverse during the working process, the slips will turn inward, and the opening and closing cannot be smoothly realized. Therefore, in the oilfield operation process, it can only be used for load-bearing operations, and cannot be used for down-pressing operations, but the split type slips have a large diameter; the structure of the slider type slips is that the slip teeth slide along the fixed slope of the guide block. To achieve opening and closing, the gripping effect of the slips will be correspondingly worse when the inclination angle of the incline becomes larger, so the inclination angle of the incline is generally relatively small. The slips are very small, and the diameter of the slips becomes smaller accordingly, which cannot meet the passing requirements of large-diameter downhole tools, and the structure is complex and bulky. During the operation of the oil field, when large-diameter tools need to pass The overall removal of the slips, or the overall removal, the procedure is very cumbersome, the workload is large, and a lot of manpower, material resources and precious working time are wasted. Stable, high reliability, good alignment

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