Construction method for stable puncturing of self-elevating platform pile shoe

Abstract

The invention relates to a construction method for stable puncturing of a self-elevating platform pile shoe. The construction method for stable puncturing of the self-elevating platform pile shoe comprises the following steps that a, the position of the pile shoe is positioned: the position of an offshore oilfield pile shoe is positioned by using communication equipment, and the head direction of a self-elevating platform and the position of the pile shoe are confirmed; b, drilling grouting is achieved: a circle of holes are drilled in the periphery of the pile shoe position determined in the step a, and cement paste is injected to form a cement sheath; c, the self-elevating platform is in place, specifically, the self-elevating platform is in place according to the position surveyed in advance, the first direction of the self-elevating platform is adjusted, and it is confirmed that the pile shoe position in the step a is matched with the drilling grouting position in the step b; and d, pile shoe tripping-in is conducted, specifically, the pile shoe is tripped into the seabed through an automatic lifting pile leg on the self-elevating platform till the pile shoe is located on the cement sheath in the step b. According to the construction method, the phenomenon that the self-elevating platform pile shoe is punctured is avoided, the tripping-in speed can be increased in the tripping-in process of the pile shoe, and field operation efficiency can be improved.

Description

technical field [0001] The invention relates to a construction method for stably puncturing spud cans of a self-elevating platform, and belongs to the technical field of offshore oil field exploitation. Background technique [0002] The self-elevating platform has legs that can be raised and lowered freely. During operation, the legs extend down to the seabed, stand on the seabed, use the legs to support the platform, and keep the bottom of the platform at a certain distance from the sea surface, so as to avoid the impact of waves on the sea. Influenced by the platform, operations can be performed on the platform. Due to the unique spud shoe entry method of the jack-up platform, there is also a specific risk in the process of platform positioning - the risk of spud shoe piercing. [0003] In order to avoid such risks in the process of putting in place similar spud cans, it is particularly important to analyze the conditions of the proprietary strata and formulate constructi...

AI Technical Summary

Problems solved by technology

However, this technology has the following disadvantages: 1. The spud cans are above the hard ground, and because there is a soft mud layer below the hard ground, the stability is very poor and there is a high risk; Hard strata that may be punctured. When the hard stratum cannot reach the required bearing capacity of the spud cans, the spud cans will also puncture, resulting in platform instability

This technology has the following disadvantages: 1. The drilling area is too large, the operation is difficult, the cost is extremely high, and the effect is not significant; 2. The spud shoe piercing process is unstable, and the three pile legs cannot be pierced at the same time. It is also very easy to cause the platform to tilt, which may easily cause equipment damage or personal injury

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