Study On Dynamic Characteristics Of Vertical Fracture Well Pressure Under Different Boundary Conditions

Low permeable reservoirs exploitation has always been technical difficulties in the petroleum engineering. In the present view, fracturing achieve good economic returns. The effect of fracturing depends largely on the knowledge and understanding of the payzone, and the vertical fractured well test analysis techniques is an effective way to understand、analyse and evaluate fracturing quality. Starting from the basic theory of fluid mechanics in porous medium inherit the previous researches, take the single well as a research object, have done a lot of analysis and research work on dynamic characteristics of the pressure on the vertical fractured wells under different conditions.(1) Establishing and solving the infinite conductivity of the homogeneous formation, the finite conductivity vertical fracture in well test interpretation mathematical model.(2) Establishing and solving the infinite conductivity of dual porous medium, the finite conductivity vertical fracture in well test interpretation mathematical model.(3) Apply the principle of mirror reflection and the pressures superposition to consider under a straight line,60°,90°,120° angle imparmeable fault conditions, the dimensionless Laplace space bottomhole pressure solution of fractured vertically well.(4) Using the Duhamel principle to consider the effect of wellbore storage and skin effect on the dimensionless Laplace space bottomhole pressure solution of fractured vertically well.(5) Take the Stehfest numerical inversion technique, Visual C++ programming calculation, drawing the log-log curves of the bottomhole dimensionless pressure curve and pressure derivative curve and the characteristics and influencing factors were analyzed.