Loading...

Designing an Optimal Pumping Program for Multi-stage Hydraulic Fracturing Operation and Investigating the Effect of Different Parameters

Rashidian Maleki, Reza | 2022

129 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55331 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Jamshidi, Saeed
  7. Abstract:
  8. With the production from the reservoirs, the amount of in-situ oil storage has decreased and there is a need to increase oil recovery (EOR) from the reservoir. Increased oil recovery (EOR) includes operations such as acidizing and hydraulic fracturing. Considering the economic and high operational costs and geomechanical complexities, as well as the technical progress of hydraulic fracturing and its future; It is necessary to manage hydraulic fracturing operations optimally. This research is about hydraulic fracturing and its main goal is to optimize the parameters of the fracture or the geometry of the fracture. The research study was carried out on the Bangistan Reservoir located in the Ahvaz field with an approximate length of 75 km and a width of 8 km. In the modeling done by researchers about crack growth, it is often based on the assumption of simple geometry and isotropic environment, which is not close to the real situation in geotechnical issues. For example, the effect of porous and permeable environment as well as in situ stresses are ignored. This research has investigated the operation of hydraulic fracturing by creating several cracks, which according to previous studies on the operation of hydraulic fracturing in Iran's reservoirs and the importance of motivational issues for production in unconventional mode or production from unconventional reservoirs, so far, important aspects such as; The complexities and modern methods of hydraulic fracturing, such as creating multiple cracks or multi-stage fracturing, have not been discussed in Iran's oil industry, but in order to investigate and understand more about multi-stage hydraulic fracturing operations in Iran, this research has been conducted and its basic issues have been covered. Considering these cases and better conclusions in the research, the finite element method has been used to simulate the fracture model. The finite element method is used to solve mechanical problems and mechanical equations in solid mechanics. The disadvantages of this method are high computational cost and low accuracy in modeling the growth of cracks or cracks in discontinuous environments. To improve these disadvantages, a new method called the finite element method developed in the last few decades has been presented and used in research. Analyzes carried out in five general sections; Stress field effect analysis, pumping rate analysis, pumping fluid rheology analysis, pumping fluid density analysis and pumping speed analysis have been performed. Modeling has been done for three fractures. The effect of stress field or stress shadow has been investigated for the distance between cracks and the direction of crack growth changes as the distance between cracks increases. Optimization based on aperture and injection pressure has been done for all mentioned analyses. And according to the simulation results, the pumping rate has been selected as an operationally controllable parameter to check the operating efficiency of hydraulic fracturing in optimization based on the two parameters of fracturing and pumping pressure.
  9. Keywords:
  10. Hydraulic Fracturing ; Refined Finite Element Method ; Fracture Parameters Optimization ; Mechanical Parameters ; Enhanced Oil Recovery ; Reservoirs Acidizing

 Digital Object List

 Bookmark

No TOC