Abstract Under the influence of diapir structure, formation pressure system is complicated. The characteristics high temperature and are obvious, prediction difficult, complex accidents such as well kick leakage frequent, which seriously restrict efficient development oil gas resources. Therefore, taking Yinggehai Basin in China an example, combined with evolution structure on abnormal high-pressure, wellhole collapse fracture analyzed. Three calculation methods selected, distribution rules...

Both managed pressure drilling (MPD) and kill procedures depend on the rapid precise control of choke under varying conditions. To enhance safety automate MPD well operations, we employed African vulture optimization algorithm, a proportional integral derivative controller, an automated panel for management. Laboratory offshore platform experiments were conducted to simulate single-phase two-phase flow Additionally, reliability analysis was performed using fault tree dynamic Bayesian network...

Abstract The East China Sea Shelf Basin (ECSSB), an important part of the western Pacific margin, is located in a key area subduction and coupling Pacific/East Asian continent. There are many unknowns regarding basin structure formation mechanism. three different viewpoints on driving mechanism tectonic transition at 43 Ma: India–Eurasia Plate hard collision, direction change Plate, joint action Philippine movements. To address this controversy, we use SHELLS modeling method to simulate...

ABSTRACT The narrow annulus in small‐bore horizontal wells causes marked differences cuttings transport compared to conventional wells. To address this issue, a CFD‐based numerical model for solid‐liquid two‐phase flow the was developed, accounting eccentricity of drill string. study examines effects key factors, including rate, pipe rotation speed, well inclination angle, and drilling fluid properties, on Results show that increasing speed enhances tangential axial velocities annular by up...

Abstract Formation pressure is the most fundamental data in oil and gas drilling production; it has an important position entire cycle of extraction. However, current prediction methods are limited to parametric with fixed models; such that accuracy does not meet requirements. This especially true for deeper layers marine sedimentary basins where safety density window extremely narrow. In this study, we propose a novel method predict pore using machine learning techniques. For first time,...

Knowledge of wellbore multiphase flow characteristics is important for early gas invasion identification and treatment, especially in oil-based drilling fluid. The law downhole dual-gradient (DDGD) more complex than that conventional single-gradient drilling. There was no relevant literature report at present. In this paper, considering the synergistic feedback relationship flow, interphase mass transfer, temperature, a fully transient model established based on fluid deepwater DDGD. also...

Abstract Compared with conventional drilling methods, the method of horizontal wells a slim hole (HW‐SH) has advantages, such as high productivity, environment‐friendliness, and low costs. However, during process, narrow annulus may become blocked, which lead to an increase in pressure if wellbore is not clean. This often leads serious accidents, sticking leaking formations. Many models have been used study cutting transport law annulus, but influence drill‐pipe rotation on ignored weakened...

The multiphase flow characteristic is one of the most concerning problems during solid fluidization exploitation marine natural gas hydrate reservoirs. In this research, a new transient gas–liquid–solid model with phase transition was developed. Meanwhile, considered coupling relationship among convective heat transfer, dynamic decomposition, and flow. can simulate change pattern from solid−liquid to flow, describe distribution character volume fraction phase, wellbore temperature pressure,...

Drilling into fractured formations can easily lead to mud loss, which significantly affects drilling efficiency and increases costs. In high-temperature high-pressure environments, changes in properties render loss more uncontrollable. On the basis of a performance test environment, considering time-varying characteristics wellbore temperature pressure distribution law fracture pressure, coupling model was established this study. The developed solved numerically using finite difference...

Based on the 150 collected experimental data points, accuracy of four thermodynamic models in predicting phase equilibrium gas hydrate was compared.

During the hydrate exploitation in a shallow marine layer by mechanical crushing, particle decomposition wellbore is one of most concerning problems. In this research, dynamic model coupling intrinsic kinetics with mass and heat transfer rates was established. The can simulate process flowing water. By comparison, calculated results are good agreement measured values. numerical simulation show that non-isothermal process. early stage, rate mainly depends on rate. However, it affected late...

Abstract In deepwater drilling, accurate prediction of wellbore gas‐liquid two‐phase flow behavior is significant for gas kick detection and well‐control treatment. this study, a new transient model was developed to simulate the during in dual‐gradient drilling based on downhole separation. This accounts impact sudden change density behavior. The solved using finite‐difference method. accuracy stability were verified data measured from full‐scale experimental well. Using model, differences...

Accurate soil organic carbon (SOC) maps are helpful for guiding forestry production and management. Different ecological landscape areas within a large region may have different soil–landscape relationships, so models specifically these capture relationships more accurately than the global model entire study area. The aim of this was to investigate role zonal modelling in predicting forest SOC produce highly accurate distribution maps. prediction objects were at five depths (0–20, 20–40,...

The hybrid ship has multiple power sources and integrates the characteristics of energy sources, different need to be involved according sailing conditions. In order take into account system stability, economy, environmental protection other objectives, it is necessary develop a suitable management strategy allocate torque or output each source, so as ensure safe stable operation meet requirements enhance Hybrid efficiency, improve saving emission reduction performance. this paper, we use...