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Question No.3 (32 marks) a) List and explain five of the principle signs that a kick had occurred whilst drilling and tripping? Highlight the value of each of these signs. (10 marks) b) The figure below shows four graphs showing the change in various pressures with depth in a particular well. 2 de ma Graph A shows how the formation breakdown pressure varies with depth. Graph B illustrates the pressures at various depths (the pressure gradient achieved by using a heavy mud). Graph Cillustrates the pressures at various depths (the pressure gradient achieved by using a normal mud). Graph D shows how the formation pressure varies with depth. Using the information given above, what do you think will happen if try to drill this well first with normal and then with heavy mud? (10 Marks) What do you suggest to solve this problem so as to reach the total depth? (4 Marks) c) Given the following data: Hole Depth = 9850 ft TVD Shoe Depth = 5500 ft TVD Mud weight = 11 ppg (overbalance of 150 psi.) If the top 500 ft of this mud column is cut to 9 ppg and from 500 ft to 1300 ft the mud in the cut to 10.5 ppg, from 1300 ft to 1500 ft the mud is 10.8 ppg. If the rest of the system is uncut, what is the reduction in bottom hole pressure. (8 marks) Question No.3 (32 marks) a) List and explain five of the principle signs that a kick had occurred whilst drilling and tripping? Highlight the value of each of these signs. (10 marks) b) The figure below shows four graphs showing the change in various pressures with depth in a particular well. 2 de ma Graph A shows how the formation breakdown pressure varies with depth. Graph B illustrates the pressures at various depths (the pressure gradient achieved by using a heavy mud). Graph Cillustrates the pressures at various depths (the pressure gradient achieved by using a normal mud). Graph D shows how the formation pressure varies with depth. Using the information given above, what do you think will happen if try to drill this well first with normal and then with heavy mud? (10 Marks) What do you suggest to solve this problem so as to reach the total depth? (4 Marks) c) Given the following data: Hole Depth = 9850 ft TVD Shoe Depth = 5500 ft TVD Mud weight = 11 ppg (overbalance of 150 psi.) If the top 500 ft of this mud column is cut to 9 ppg and from 500 ft to 1300 ft the mud in the cut to 10.5 ppg, from 1300 ft to 1500 ft the mud is 10.8 ppg. If the rest of the system is uncut, what is the reduction in bottom hole pressure. (8 marks)