| For a series of problem of horizontal well percolation, in this paper, individual well is considered as research object for preblem of percolation, On the basis of theory of percolation mechanics, the steady-flow theories of individual well, branched well and well pattern are studied, at the same, the transient flow theories of individual well, branched well are studied. On the basis of these research, we studied theories and methods of horizontal well productivity analysis, well test analysis, and water drive oil. The research approaches have comprehensively adopted percolation mechanics ^ reservoir engineering % modern mathematics and modern calculation technology and so on. By studying, the achievements received are as follows:(1) Steady-flow theory of horizontal well in closing, constant-pressure boundary, bottom water, gas cap and edge water reservoirs are studied. On the basis of the research, we obtained deliverability equations of horizontal well, and analyzed the influence of the length of horizontal well and the location, heterogeneity of reservoirs on the horizontal well productivity. All of these research provided basic theories for predicting the productivity of individual well.(2) Steady-flow theory of branched well are studied, on the basis of obtaining the deliverability equation, analyzed the influence factors of branched well deliverability. All of these research provided the theories basis for predicting the productivity of branched well.(3 ) Steady-flow theory of horizontal well pattern equation are studied, on the basis of obtaining the deliverability equation of horizontal well pattern, and analyzed the influence factors of the productivity. All of these research provided the theories basis for predicting productivity of horizontal well network.(4) In this paper, we set up an transient flow mathematics model of horizontal well under infinite acting, closing and constant-pressure boundary circumstance. On the basis of the model solution, we drew up the pressure dynamic characterized curves and analyzed the effects factors on pressure dynamic. Through the research, we obtained the expression of pressure and pressure derivative and presented theoretical basis for horizontal well testinanalysis and reservoirs dynamic.(5) We set up an transient flow mathematic model of branched well, On the basis of the model solution, we drew up the pressure dynamic characteristic curves and analyzed the effects factor on pressure dynamic. Through the systematic research on the branched well percolation, we presented theoretical basis for the branched well test analysis and reservoirs dynamic.(6) Through the research of oil-water two-phase flow, We obtained the characteristic linear solution, and derivated out saturation, the time of broken-up and production equation. All of these research presented theoretical basis for reservoir engineering on water-drive reservoir exploring.(7) Analysis theories and methods of horizontal well test are set up on the basis of the research results of transient flow, we have completely described the pressure drawdown and build-up conventional well test method of horizontal wells, and also provided methods of chart match analysis and characteristic values analysis which belongs to a new idea of the studies of this essay, for there is still no reports from domestic documents. Meantime, we have explained the pressure build-up data of example horizontal wells by means of the match method of chart and analysis method of characteristic values, and acquired reliable results. The analysis and studies of horizontal wells test provide a kind of important means and methods to understand the dynamic characters of reservoir.(8) We presented the theories and analysis approaches of the horizontal well inflow performance for oil-gas two-phase flow and proved it reasonability and feasibility with two example. This research provide theoretical basis for making up a reasonable work system in solution-gas-drive reservoirs.Through the research results, we observed...
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