Numerical Simulation Of Fracturing Initiation In Horizontal Wells With Fixed Plane Perforation In Low Permeability Reservoir

In recent years,with China's oil and gas exploration entering a new peak of reserve growth,crude oil production has steadily increased,natural gas production has increased rapidly,reservoir reconstruction technology has played an important role.However,with low permeability,the reserves of unconventional reservoirs are more and more,the difficulty of effective production and development of reserves is increasing,and the technology of reservoir reconstruction is facing new challenges.Horizontal well technology is not only the need to contain,improve and reverse the "multi-well low production" reality,but also the need to change the mode of economic growth.Horizontal well fixed plane perforation technology can not only increase the production efficiency and success rate,but also improve the fracturing effect,optimize the fixed plane perforation scheme to perform fixed plane perforation on different terrain,and make the perforating hole pass through the natural fracture of rock.To reduce the initiation pressure and increase the fracture area,thus increasing establish production.In the future production of oil(gas)fields,it has become a general trend that a large number of fixed plane perforation technology has been widely used.Therefore,it is of great significance to study the hydraulic fracturing of horizontal wells with fixed plane perforation.This paper mainly studies the following aspects:First,the finite element software ABAQUS6.14 was used to establish an extended finite element calculation model.The stress,wellbore and perforation dimensions of the model were all derived from engineering practice,and then the load boundary conditions,mesh size,and element selection were considered separately.Select the intensity destruction theory that is most suitable for the content of the research model in this paper to simulate and analyze.Taking the example of a horizontal well in the Chang 7 reservoir of the Yishan slope of the Ordos Basin as an example,the finite element simulation was used to compare the crack initiation pressure obtained from the finite element simulation with the crack initiation pressure measured at the site to verify the limited Metamodel and calculation methods are correct.Secondly,using the finite element software to establish multiple calculation models,from two different stress fields,wellbore azimuths,wellbore inclination angles,maximum horizontal principal stress,and minimum horizontal principal stress,all faced perforation and spiral perforation A comparative study of the effects of stress and draw relevant conclusions.Finally,using the finite element software to establish a number of computational models to study the relationship between hole depth,pore size,pore density,and the perforation initiation pressure of the perforation under different conditions of the stress field;the fan-shaped surface formed by the perforation of the horizontal well.The influence of the vertical pressure and parallel to the wellbore axis and the same plane on the initiation pressure,and the influence of the angle between the vertical in-situ stress and the fan face of the perforation on the crack initiation pressure,and draw relevant conclusions.