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Analysis and Optimization of Plug Slips for Oil Well Formation Fracturing

Basiri, Amir Ali | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56321 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Arghavani Hadi, Jamal
  7. Abstract:
  8. In the oil industry, after drilling an oil well and laying pipes, it is time for the hydraulic fracturing process. In the process of hydraulic fracturing, a fracture must be created in the casing pipe of the well. The reason for this is that the oil from the existing reservoir enters the well so that it can be extracted. The end of the well must be blocked to cause a fracture in the well body. The reason is that after creating a fracture in the casing pipe, proppant particles are pumped together with water inside the well to keep it open. For the proppant particles to be placed inside the cracks, it is necessary to create pressure in the fracture area. To create pressure in the fracture area with water, it is necessary to block the end of the well. To perform this blocking, which is related to creating a fracture in the well body, a piece of equipment called a frac plug is used. One of the main components of the frac plug is the slip. The function of the slip is to anchor to the well body. There are three types of slips: wicker type, button type, and friction type. The purpose of this research is to optimize frac plug slips in the entire hydraulic fracturing process. In this research, the activation stage of the frac plug and the differential pressure stage are considered. In the optimization section, the objective functions are less damage to the casing pipe when the slip is anchored to it, and at the same time better performance of the slip under the working pressure and temperature. The damage caused to the casing pipe is defined as the amount of indentation of the slip inside it and the scratch that the slip makes on the casing pipe. Optimization parameters are also geometric and boundary conditions. The geometric parameters associated with each type of slip are different. These types of parameters are related to the geometric design of the slip. The parameters of the boundary conditions are also related to the slip installation pressure in the activation stage of the frac plug. To do this optimization, simulation is used. The results of this research show that the wicker slip can withstand the differential pressure of 30,000 psi in the best case. This amount is 9,000 psi for a button slip and 7,800 psi for a friction slip. Therefore, the wicker slip has the best performance. The amount of indentation and scratch on the casing pipe for the friction slip is zero. In the wicker slip, the maximum indentation is 0.57 mm and the maximum scratch is 1.7 mm. In button slip, the maximum indentation is 1.85 mm and the maximum scratch is 2.6 mm. Therefore, the friction slip causes the least damage to the casing pipe
  9. Keywords:
  10. Supporting Pad ; Hydraulic Fracturing ; Pipe Casing ; Frac Plug ; Fracture Plugging ; Formation Damage

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