Method for determining insertion depth of offshore self-elevating drilling platform piles into mud

Abstract

The invention relates to a method for determining insertion depth of offshore self-elevating drilling platform piles into mud according to the factors of pile inserting and backfill in the pile area and a DRC model of the grouped pile effect factor. The method comprises the following steps: calculating the bearing capacity of the self-elevating drilling platform piles by adopting the DRC model: considering the influence of the dynamic load generated during the insertion of the self-elevating drilling platform piles to the insertion depth of the piles into the mud, the influence of the reflow of the earth on the upper parts of pile shoes inserted blow the mud surface to the insertion depth of the piles into the mud, and the grouped pile effect caused by the reason that a plurality of self-elevating drilling platform piles enter below the mud surface to affect one another and squeeze the earth; and finding the corresponding bearing capacity of the self-elevating drilling platform piles, which is equal to the insertion depth of the self-elevating drilling platform piles with the maximum preloading capacity, to obtain the insertion depth of the offshore self-elevating drilling platform piles into the mud. The method can be used for reasonably determining the insertion depth of the offshore self-elevating drilling platform piles into the mud.

Description

technical field [0001] The invention relates to a pile insertion control technology of an offshore jack-up drilling platform, in particular to a method for solving the problem of predicting the mud penetration depth of the pile legs of the jack-up drilling platform. Background technique [0002] For offshore oil exploration and development operations using jack-up drilling platforms, the mud entry depth of the legs of the jack-up drilling platform plays an important role in the entire oil exploration and development. If the mud entry depth is too small, it will make the platform The stability against wind, waves and currents is reduced, and the toe parts are easily scoured by seabed currents. During long-term drilling operations, there are risks such as sudden subsidence and overturning. If the depth of the mud entry is too large, it will be difficult to pull out the piles, which will take too much time and affect the timeliness of the precious offshore operations, and even ...

AI Technical Summary

Problems solved by technology

The traditional "trial insertion" operation has great blindness, and at the same time greatly reduces the efficiency of offshore operations, affects the timeliness of exploration and development of the entire offshore oil and gas field, and brings great economic waste

In addition, in different sea areas, the sea conditions are different. Therefore, the success rate of this trial insertion method of the jack-up drilling platform is low, and there are great safety hazards: the depth of the pile legs into the mud is too shallow, and the jack-up drilling platform The stability of the platform against wind, waves and currents cannot be guaranteed; the spud boots are too shallow into the mud, and the soil around the spud boots will be washed and hollowed out by the seabed current, resulting in a reduction in bearing capacity, and unpredictable and uncontrollable subsidence of the spud boots may occur. even a puncture accident

[0021] Therefore, when adopting the traditional trial insertion method for pile insertion operation of the jack-up drilling platform, its blindness makes the platform have the possibility of puncture, difficult pile extraction, tilting or even overturning, general damage and other accidents, and the jack-up drilling platform The unreasonable depth of pile legs into the mud will also cause marine accidents, causing casualties and economic losses, which is not allowed by the industry's "safety above all else" requirements

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