| Well test interpretation 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 test interpretation, we could exploit the reservoirs effectively.Generally,percolation in low permeability reservoirs does not follow Daracy's law.On the contrary, percolation segment and a linear percolation segment which does not go though the origin. Because of characters above, it is difficult to describe the real reservoir performance applying routine percolation theories and conventional. test methods in low-permeability reservoirs. Both home and abroad conduct some studies on theories of low-permeability reservoirs,however,there are still many problems.So far ,we have not seen the reports of well test interpretation theory on complex structure wells such as part perforated well ,fractured well and so on.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;By means of Lord kelvin point source function,Duhamel correction formula ,Laplace inversion and integral transformation, type curves was obtained; Based on the above theory, the parameter which effect the well was analyzed. The plate of curves are applied in analysis software that be developed. The real well test data from Baibao oil field are analyzed by the software.The program can analysis field data,then permeability, skin effect at the wellbore and wellbore storage coefficients are calculated.The test interpretation 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 test interpretation theory, which had provide the science reference for realizing, evaluating and exploiting the low permeability reservoirs. |
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