Abstract
The accurate prediction of overpressure is one of the key issues that restrict the effective development of oil and gas resources in the Yinggehai Basin. In this paper, the formation mechanism of overpressure in Yinggehai Basin is studied. Based on this mechanism, the quantitative prediction model and empirical parameters of overpressure are optimized in Yinggehai Basin and applied in engineering. The results show that the formation mechanism of overpressure in the Yinggehai Basin is complicated, and the causes of overpressure in different blocks of basin are different. The eastern block mainly develops loading-type overpressure, while the Ledong block is dominated by unloading high pressure. Different blocks should employ different abnormal high-pressure prediction models. The East block mainly adopts the Eaton method, and the Ledong block mainly utilizes the Bowers method. The empirical parameters of different models can be determined according to the actual drilling conditions. The practical application demonstrates that the abnormal high-pressure prediction error is within 2%, and it is able to satisfy the requirements of on-site engineering.
Highlights
The Yinggehai Basin is located in the west of the South China Sea and is rich in oil and gas resources
The results show that the formation mechanism of overpressure in the Yinggehai Basin is complicated, and the causes of overpressure in different blocks of basin are different
The eastern block mainly develops loading-type overpressure, while the Ledong block is dominated by unloading high pressure
Summary
The Yinggehai Basin is located in the west of the South China Sea and is rich in oil and gas resources It is the main area for exploration and development in the western South China Sea. overpressure is common in this area, and the equivalent mud density is as high as 2.30 g/cm, which poses a great challenge for safe drilling operations. The prediction accuracy of the pore pressure in the drilling operation of this area is extremely high [1] [2]. This paper fully analyzes the overpressure identification method and overpressure quantitative prediction model On this basis, the formation mechanism of overpressure in Yinggehai Basin is studied, and the pressure prediction model and model parameters are optimized. It is of great significance to reduce the probability of drilling complex situations such as kicks and blowouts, ensure the safety of drilling, timely and effectively develop oil and gas resources in the Yinggehai Basin
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