Prediction method of pile foundation stratum rupture during jack-up drilling platform pile insertion

Abstract

The present invention provides a method for predicting the fracture of pile foundation strata in the pile insertion process of a jack-up drilling platform. A three-component acoustic wave receiver array is arranged at the bottom of each pile shoe of the jack-up drilling platform; the three-component acoustic wave receiver array is obtained during the pile insertion process. The acoustic emission signal from the formation below the spud can is continuously received by the acoustic wave receiver array; the fracture state and the location of the fracture point of the pile foundation formation at the bottom of the spud can are predicted according to the acoustic emission signal, wherein, during the drilling platform insertion process, the spud can Acoustic emission signals will be emitted during the fatigue fracture process of the hard crust formation at the bottom. By arranging a three-component acoustic wave receiver at the bottom of the spud can, the acoustic emission signals emitted during the fatigue process of the hard crust formation will be collected as data for predicting the fracture state and the location of the fracture point The foundation can judge the possible time and location of the fracture of the pile foundation layer to avoid puncture accidents. The present invention can be used not only for the process monitoring of the self-elevating drilling platform, but also for the real-time monitoring of the state of the platform after being in place.

Description

technical field [0001] The invention relates to the field of marine engineering monitoring and safety assurance, in particular to a method for predicting the fracture of pile foundations in the process of pile insertion on a jack-up drilling platform. Background technique [0002] Offshore oil and gas has become an important replacement area and one of the important pillars for the country to increase oil and gas reserves and production. The realization of increased reserves, stable production and even production of offshore oil and gas is an important force to ensure the safe supply of domestic oil and gas. [0003] The jack-up drilling platform is the main equipment for the development of offshore and marginal oil fields. In order to ensure the stability of the platform and the smooth operation of the platform, the legs need to be inserted into the seabed stratum. In the platform piling operation, the upper and lower soft multi-layer foundations are often encountered, and ...

AI Technical Summary

Problems solved by technology

At present, the measurement of marine geology cannot be verified by a large number of repeatable results, the measurement range is large, and the pertinence is poor; the results of coring experiments are affected by various factors such as sampling point distribution and sampling disturbance, and the representativeness is poor, resulting in None of the above studies can reflect the real-time characteristics of the in-situ soil layer under compression deformation, and it is difficult to truly solve the problems of pile puncture prediction and prevention and control in engineering practice

[0005] Therefore, there is a big difference between the piling operation plan provided by the existing engineering survey and research work and the actual piling depth, stratum bearing capacity and other parameters in the piling process, which cannot meet the needs of safe piling operations. Accident prediction and prevention is still an urgent technical problem in the industry

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