转向压裂井裂缝转向的影响因素分析

为了尽可能提高转向压裂井的增产效果,依据油藏应力场理论及油气井生产渗流理论建立了初次压裂裂缝和油水井生产过程对于裂缝附近应力场的影响模型。研究了初始水平地应力差、初始裂缝长度、初始裂缝宽度、生产压差和渗透率对转向压裂井裂缝转向的影响;并通过正交实验设计及其直观分析方法明确了各因素对裂缝转向影响程度。在诸多影响因素中,初始水平地应力差是影响裂缝转向的最主要因素,生产压差次之,储层渗透率与初始压裂裂缝宽度的影响居中,初始压裂裂缝长度对裂缝转向的影响最小。可用以指导转向压裂的选井选层。

The analysis of fracture reorientation influence factors in turnaround fracture well

In order to improve the oil production in turnaround fracture well, the mathematical model of stress field prediction considering the existence of initial hydraulic fractures and impact of oil and water well production is built with the help of reservoir stress field and oil and gas well production percolation theory. The influence of reorientation fracture about the initial horizontal ground stress difference, initial fracture length, initial fracture width, producing pressure drop and permeability are studied in turnaround fracture well. The impact of various factors are cleared by means of orthogonal experimental design and intuitive analysis method. Among several factors, initial horizontal ground stress difference is the most important factor affecting the fracture reorientation, producing pressure drop is the second place, permeability and initial fracture width are in the middle, initial fracture length is the minimal Impact. The research result given by this paper can provide a guidanc for well and layer selection in turnaround fracture well.