Research On Well Pattern Considering Hydrocarbon Fracture In Low-Permeability Reservoir

Well pattern arrangement is one of the most important parts in oil and gas field development management. With the increasing speed of low permeability reservoir exploration and development, the technique and content research on low permeability reservoir development becomes richer. The theses took Xishanyao formation sand X₂ of Niuquanhu oil field as research project. Guided in reservoir development theory, took reservoir microscopic characteristics study, flow unit division, numerical simulation as means, the theses did some research work about low permeability reservoir flow unit under the condition of hydrocarbon fracturing. The theses developed optimizing work in well pattern research on the condition of integral hydraulic fracturing in low permeability reservoir. The contents of research work mainly consists four parts:1. Low permeability reservoir microscopic characteristics and flow unit division. By studying pore throat structure of reservoir, on the basis of reservoir physical parameters calculated the FZI characters value of the flow unit, did flow unit division. Further combined with sedimentary source and sedimentary micro-facies, did comparative study on flow unit, obtained the different flow units’distribution law and distribution characteristics.2. Study on flow characteristics of low permeability reservoir. on the premise of considering the start-up pressure gradient, took Xishanyao formation sand X₂ of Niuquanhu oil field as research project , according to core test data and well test data ,obtained a relational expression of well spacing calculation, did some research on well spacing.3. Low permeability reservoir fracture and earth stress research. Developing reservoir fracture and earth stress research. Starting with logging data and core description, analyzed the distribution law of the orientation of the principal stress, natural fracture and hydraulic fracture in Xishanyao formation sand X₂ of Niuquanhu oil field, obtained the orientation of the principal stress and hydraulic fracturing distribution major direction.4. Low permeability reservoir well pattern optimization. Based on flow unit division of different reservoir characteristics and low permeability reservoir flow characteristics, did some well pattern research on different flow unit and considering hydraulic fracturing. Respectively considering well pattern, well spacing, injection-production differential pressure, fracture flow capacity, fracture length, direction and so on, did some numerical simulation, and contrasted some development indexes, established the way of well pattern optimization.The theses widened and developed study method of considering hydraulic fracturing well pattern arrangement in low permeability reservoir in early field life, which have certain theory value and application prospect, and supply study thought and technical method of development evaluation and adjustment for last stage of low permeability reservoir development.