Marine rig hydraulic wave compensation device

Abstract

A marine rig hydraulic wave compensation device comprises a drill tower fixedly arranged on a drilling vessel, a tower top pulley, a steel wire rope and a hydraulic wave compensation mechanism, wherein the tower top pulley, the steel wire rope and the hydraulic wave compensation mechanism are arranged at the top end of the drill tower. The hydraulic wave compensation mechanism comprises an oil cylinder fixed wheel, an oil cylinder, an oil cylinder movable wheel, a sealed oil storage device and an oil pipe. The oil cylinder fixed wheel is fixedly arranged on the drilling vessel, the oil cylinder comprises a cylinder body and a piston rod, the lower end of the sealed oil storage device is provided with hydraulic oil, the upper end of the sealed oil storage device is provided with compressed gas, the hydraulic oil in the sealed oil storage device is communicated with hydraulic oil in an inner cavity of the cylinder body through the oil pipe, one end of the steel wire rope is connected with a drill bit part, and the other end of the steel wire rope sequentially winds around the tower top pulley, the oil cylinder fixed wheel and the oil cylinder movable wheel and is fixed to the drilling vessel. Quick and accurate compensation to balance of the drill bit part can be achieved, the marine rig hydraulic wave compensation device is simple in structure and stable and reliable in compensation and is not influenced by shaking of the drilling vessel, and safety hidden hazards do not exist.

Description

technical field [0001] The invention relates to the field of geological exploration machinery, in particular to a hydraulic wave compensation device for an ocean drilling rig. Background technique [0002] The operating environment of offshore drilling is far more complex than that of land drilling. The floating and sinking of the drilling ship caused by undulating waves is one of the important factors affecting the quality of offshore drilling. In order to eliminate the impact of wave fluctuations on ocean drilling, the drilling ships are equipped with wave compensation devices. figure 1 It is a structural schematic diagram of an existing ocean drilling rig wave compensation device, which includes a drilling tower 1, a steel wire rope 2, a tower top pulley 3, a counterweight 4 and a casing 5, and the drilling tower 1 and the casing 5 are fixedly installed on the drilling ship 6, the tower top pulley 3 is installed on the top of the drilling tower 1, one end of the steel wi...

AI Technical Summary

Problems solved by technology

[0004] 1. During the floating and sinking process of the drilling ship, affected by the shaking of the hull, there will inevitably be friction and collision between the counterweight and the casing, which causes the counterweight to respond slowly to the balance compensation of the drill bit components: in the counterweight When the inner wall of the casing is smooth and undamaged, the response time of the counterweight to draw or release the rope can be less than 0.1 second, which can basically achieve the balance effect, but because of the friction and collision between the counterweight and the counterweight casing When the inner wall of the counterweight casing becomes rough, the response time of the counterweight to take in or release the rope generally exceeds 0.3 seconds, and the balance compensation response is even inaccurate. In severe cases, the counterweight may be stuck in the casing, causing safety hazards. Accidents, Difficulty Meeting Offshore Drilling Requirements

[0005] 2. The counterweight must be put into the casing fixed on the drilling ship to prevent the counterweight from swinging laterally or falling off and hurting people. The total weight of the counterweight in the wave compensation device is about 85% of the weight of the drill bit. The weight of the drill bit is 2000kg, and the total weight of the counterweight should be controlled at about 1700kg; the weight of a single counterweight is about 60-80kg, and the height of the counterweight casing is 3-5m. Put it under the tube. When you put in a piece, you must pry up the previously placed weight to leave enough space for the weight that needs to be put in now. It will cause some inconvenience for installation and removal.

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