Manufacturing method of hook body of large hook for polar region drilling machine

Abstract

The invention provides a manufacturing method of a hook body of a large hook for a polar region drilling machine. The manufacturing method adopts the process steps of design and blanking, forging, rough machining, heat treatment and finish machining, and the hook body is processed according to requirements of GB / T19190 and APISpec8C. The forging hook body processed by the manufacturing method adopts the integral forging design, the conventional material 35CrMoA and normalizing, tempering and subcritical quenching processes are adopted, and the intensity, the impact power in the polar low-temperature environment (-60 DEG C) and other mechanical properties of the hook body are ensured. The hook body of the large hook processed by the manufacturing method is applicable to petroleum drilling machines and workover rigs in polar low-temperature environment (-60 DEG C), the safety factor is guaranteed, and sufficient low-temperature impact toughness and polar low-temperature environment resistance performance is realized.

Description

technical field [0001] The invention relates to a method for manufacturing a hook body for a polar region (low temperature -60°C) drilling rig. The hook manufactured by the method is used to lift underground drill strings, drilling tools and other drilling rig devices and materials. Background technique [0002] The proven oil reserves in the Arctic region account for about 1 / 4 of the world's total. As the world's energy demand continues to grow, oil exploration, development, and oil production continue to shift to the polar environment. As an essential equipment, oil drilling rigs are required to be able to serve in the polar low temperature environment (-60°C). The hook body is a key component on the main load path, and its function is to bear the load of the drill string and drilling tools , requiring high reliability. The Chinese national standard GB / T19190 and the American Petroleum Institute API Specification 8C have put forward very high requirements for it. Not only...

AI Technical Summary

Problems solved by technology

[0008] There are two disadvantages in the hook body of the casting structure. One is that the impact energy can only reach -45°C required by GB / T19190 and API 8C specifications, but the impact energy at -60°C can hardly be reached, and the performance stability is poor; the other is that The casting itself has a high probability of defects, magnetic particle flaw detection and ultrasonic flaw detection are often unqualified, the scrap rate is high, the pass rate is only 30-60%, and the reliability is poor

[0009] Welded structure, the weld becomes the weak link, the heat-affected zone and the weld cannot reach the impact energy at -60°C required by GB / T19190 and API 8C specifications, because the plate is thicker, the welding is difficult, and the weld is not damaged Flaw detection is not easy to implement due to the shape and thickness of the plate. Welding defects have become the main factor affecting product quality, especially the weld between the hook body and the auxiliary hook that is the most stressed has become the biggest hidden danger affecting quality. Thick plates can only guarantee the impact energy at -40°C

[0010] At present, there is no oil drilling rig hook suitable for -60°C polar environment

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