Optimization Study On Integral Fracturing Parameters For Low-permeability Reservoir

It’s difficult to establish the effective driving system by water flooding which isextensively used in oilfield currently. The field practice indicates that integral fracturing is anexcellent method to develop the low-permeability reservoir, which alters the fluid flow patternessentially. However, because of the interaction and mutual restriction among fractureparameters, it’s urgent to seek out a method to optimize fracture parameters to exploit thelow-permeability reservoir efficiently.Starting from the analysis of fractured well flow theory, the mathematical model onwater-oil two-phase transit flow in the low-permeability reservoir with integral fracturingdevelopment has been established, where the fracture parameters such as fracture half length,height, flow conductivity, orientation and pattern well spacing are taken into consideration,then the numerical method has been used to solve it in this paper. In the usual mesh, it’s at theexpenses of calculation accuracy by enlarging fracture scale. Here the new mesh technologyhas been adopted that’s characterized by the flow behavior of fracturing well pattern, whichconsiders the coupling effect between artificial fracture and reservoir, and it improvescomputational speed as well as the simulation precision is guaranteed.Firstly, the water flooding effect of single production well or injection well fractureparameter has been analyzed by taking rectangular pattern and nine-spot pattern as example.The result indicates that the artificial fracture parameters have great influence on productionbehavior of fractured well, and each exists an optimum value which goes against assumptionthat the bigger, the better when the other parameters are fixed. Secondly, the optimizationmethod for integral fracturing scheme in low-permeability reservoir based on fuzzyintegration evaluation method has been established, and the match study between artificialfracture parameters and well pattern as well as reservoir nature (pattern well spacing andreservoir permeability et al.). Finally, the optimal fracture parameter combination has beenpresented when the well pattern and reservoir nature are fixed.The numerical simulation technology and application method for integral fracturingwater flooding development in the low-permeability reservoir has been enriched anddeveloped in this dissertation, by which the reasonable artificial fracture parameterscombination can be optimized. It’s provides water flooding development in low-permeabilitywith technical support, which is of strong directive significance and practical value.