Powered rat-hole offline stand column connecting and unloading system and stand column connecting and unloading method

Abstract

The invention provides a powered rat-hole offline stand column connecting and unloading system and a stand column connecting and unloading method. The system comprises a pipe setback, a single rat-hole power device and a temporary stopping arm. The single rat-hole power device comprises a single-station rat hole and a rat-hole hydraulic device. The temporary stopping arm is arranged on a drillingplatform surface and located between the single-station rat hole and the pipe setback, and comprises a base, a clamping mechanism and a hydraulic clamping device, wherein the rat-hole hydraulic deviceand the hydraulic clamping device are electrically connected with a driller room. The system can be applied to the field so as to replace a second rat-hole device with the temporary stopping arm, thespace limit problem under the drilling platform surface is solved, the overall structure is simplified, the weight is reduced, and equipment power consumption is lowered. The temporary stopping arm is convenient to disassemble and mount, and the fixing position and fixing height can be flexibly adjusted. The powered rat-hole offline stand column connecting and unloading processes achieving easy and convenient string storing-taking operation, low power consumption, low cost and full-automatic control are realized.

Description

technical field [0001] The invention relates to the technical field of marine drilling equipment, in particular to a power rathole off-line connecting and unloading column system and a method for connecting and unloading the column. Background technique [0002] Offshore drilling is a complex system engineering. In order to reduce the operating cost of offshore drilling, various measures will be adopted in the design of the platform to improve operating efficiency, reduce energy consumption, and enhance the safety performance of equipment. In terms of handling drill pipes, at present, most of the double rathole schemes are used to realize the off-line connection and unloading process of the drilling system. Among them, the first rathole is used for connecting and unloading vertical drill pipes (referred to as vertical), and the second rathole is used for storage. Temporary root set (double set or triple set). Usually, the length of a single vertical root is generally 8m to ...

AI Technical Summary

Problems solved by technology

In the process of standing root connection and unloading, the depth of the rat hole is adjusted by the rat hole power device to control the lifting height of the stand root, and then the iron driller cooperates with the derrick, top drive, and swimming system (a set of top drive and the swimming system supporting the top drive weigh up to More than 70 tons) completed important processes such as padding, twisting, buckling elevators, and swinging pipes to realize the butt joint of multiple vertical roots. Since the height of the unloading operation is too high, the frequent movement of the top drive and the swimming system is required, resulting in power consumption and The problem of high cost, therefore, the vertical root connection and unloading operation is usually limited to a height range of 0.5-1.5m above the drill floor surface, so that the rat hole must be at least 8m-30m below the drill floor surface to meet the requirements for connection and unloading. Due to the height requirement of the operation, the mouse hole occupies a large space on the drill floor and has a narrow application range, especially when used in a semi-submersible platform with a single derrick, it is easy to cause interference between the mouse hole and the riser

In addition, the weight of a single mousehole is 12t~15t, and the multi-station mousehole is extremely unfavorable for the weight reduction of the drilling platform

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