Theoretical Investigation On The Well Testing Analysis Of Non-Darcy Flow In Low Permeability Reservoirs

With the development of the new reservoirs production techniques, lots of low permeability reservoirs were put into production and many well testing data had shown the Non-Darcy flow characters. So we must analyze and illustrate the Non-Darcy flow mechanism and set up the related well testing interpretation models to evaluate the oil well testing data in the low permeability reservoirs. Then we could evaluated the low permeability reservoirs at the early stage, determine the formation pollution, formation parameters and its productivity to guide the reservoirs production. Well testing analysis technique was a very important dynamic analysis method and basis to realize and evaluate the reservoirs as well as dynamic production monitoring. By means of reasonable oil well testing analysis, we could comprehended and mastered reservoirs characteristics, predicted its productivity so as to master its dynamic production and exploit the reservoirs effectively. So the thesis developed deep study about the theoretical and method on the well testing analysis in the low permeability reservoirs.The thesis had deeply studied the non-liner flow characteristics, mathematical models under different boundary conditions were established, the bottom-hole pressure solutions in Laplace space were solved and type curves in different conditions were described. These Well Testing models were: homogeneous reservoir with infinite boundary, homogeneous reservoir with constant pressure boundary, homogeneous reservoir with closed outer boundary; double media reservoir with infinite boundary, double media reservoir with constant pressure boundary, double media reservoir with closed outer boundary; vertically fractured well in homogeneous reservoir with infinite boundary, vertically fractured well in homogeneous reservoir with constant pressure boundary, vertically fractured well in homogeneous reservoir with closed outer boundary; vertically fractured well in double media reservoir with infinite boundary, vertically fractured well in double media reservoir with constant pressure boundary, vertically fractured well in double media reservoir with closed outer boundary; composite system with infinite boundary, composite system with constant pressure boundary, composite system with closed outer boundary. The well testing mathematical models, bottom-hole pressure solutions in Laplace space and type curves developed in this thesis had been developed to enrich the low permeability well testing analysis theory, which had provide the science reference for realizing, evaluating and exploiting the low permeability reservoirs. So it could be put into the research of well testing analysis in the low permeability reservoirs.