It has been increasingly realized that the oil drilling project is a complex and dynamic system. Therefore, a range of system models is needed to help understand changes in interacting subsystems in vertical degasser application. Thus, we can better get to know the influence of vacuum degasser activities, and explore possible future changes in terms of oil drilling. Integrated assessment of environment and oil drilling development is arguably the most difficult problem faced by many investors. To illustrate this approach, we may present results from the integrated system model in vertical degasser application. It consists of coupled models so as to address such oil drilling issues as atmospheric chemistry, drilling dynamics, and ecosystem processes. An uncertainty analysis of vertical degasser application implies that without mitigation policies, the average surface temperature may rise with high confidence limits. Around the drill string, Mud agitator can be used to pack the annulus off, while larger particles may go around the bottom hole. What is more, vertical degasser application will further pressure on the drill string which prevent the movement of Mud agitator. If the drill string cannot be pulled out, freeing operation should be started and the drilling program might be behind schedule. Sometimes many days should be spent by the drilling crew to solve the Mud agitator problem.
In the case of vertical degasser application, the drilling operators may also impose heavy expenses to free the drilling pipes and drill strings. To be more specific, the drill pipes and Mud agitator will be unscrewed across the nearest tool joint above snag point. Upper section in vertical degasser application will be pulled out of the hole and operation will be resumed by so as to retrieve the stuck part. The operation may last for a few hours due to complicated geographic locations of the stressed zone as well as extreme over pressure formations. In such case of shale shaker application, frequent kick, loss and pipe sticking scenarios can be observed. Major part of drilling operation in oilfields is done by more than 50 rigs onshore and offshore. Since we have more drilling equipment, we can increase the probability of solving drilling problems in a successful manner even at enormous costs. Drilling period in vertical degasser application can be divided to different parts including perfect well time, invisible lost time, technical waiting and drilling hazards. Perfect well time is actually controlled by certain efficiency with the help of Mud agitator. And the occurrence of drilling problems is likely to increase the entire oil drilling time. Technical waiting of Mud agitator will come true when operational parameters exceed the working capacity so that stronger tools should be transited and employed.