Currently, there are many articles in the world related to the drilling of long-range wells. This article presents the design of the drill string for the Manto-2 production interval with a diameter of 155.58 mm of the VFN-752 well in the Varadero field.
The use of a combined aluminum drill string and a steel drill pipe is proposed due to the difficulties of this type of well, characterized by high values of torque, drag and equivalent circulation density due to the large horizontal displacement and its depth vertical. A comparison is made of the two proposed drilling string. The first consists only of steel drill pipes, and the second consists of aluminum and steel drill pipes. Using the specialized Landmark (Well Plan) software, the torque, drag and stress values acting on the drill string for various drilling modes and hydraulic calculations were modeled to determine the equivalent circulation density during drilling. The simulation results show that the use of drill strings in combination with aluminum and steel pipes can reduce the torque, drag and stress on the drill string in this type of well, which is an advantage in well drilling with extended reach.
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