| The Ordovician carbonate rock ancient buried hill hydrocarbon reservoir of the LunNan Oilfield is located north the Tarim basin and the areal structure is located the middle east section of the Tariy basin north uplift. The reservoir distributes broadly, universal contain oil or gas. Buried depth is 4225.0-6473.0meter, formation temperature is 120℃-130℃.it is a great thick carbonate rocks reservoir. Reservoir anisotropy is great,Its space mainly is the limestone cave, dissolved pore and crack.The connectivity is bad.The lithological character is compact.The matrix permeability is low, The oil gas transfusion channel mainly is a crack. The fracture spacing is changeable.The different crack coexists.lt is difficult to realize the technique of deep acid-fracturing. Has taken into conosideration the reservoir characterist of the LunNan oil field in Tarim besin, This article has done following several aspects work:(1) Through the analysis of reservoir petrology characteristic , natural characteristic, formation fluid nature, reservoir space type as well as latent injury factor of the acidizing process, We can make out the mechanism of increase production,clarify the natural factor of limit block production and the technology of limit the effect of acid-fracturing;(2) In view of high temperature carbonate rocks reservoir, analysised the adaptability of two kinds of main body acid creatively,including the hydrochloric acid and the organic acid;(3) In view of three kinds of acid liquor system which has been used before, carried out systematically experiment of the acid-rock reaction kinetics at high temperature and the fracture conductivity experiment.and evaluated compatibility of three kinds of acid liquor system;(4) Carried on the adaptability appraisal to each kind of high temperature deep acid-fracturing well craft which was made up of the different acid liquor system and the different acid fracturing process, analysed the feasibility other three kinds acid-fracturing craft which has not been used in this region;(5) Based on the predecessor studies, established a new acid-fracturing pressure drop explanation model, which considered multi-factors influence, furthermore this model adopted the method which iterated many times can avoid to calculate the acid liquor filtration coefficient directly.The method is simple and feasible.(6) For the first time, synthesizesed many technologies such as the net pressure double logarithmic curve analysis, the net pressure matching, the pressure drop analysis, three dimensional acid-fracturing simulation as well as productivity numerical simulation and so on, constructed a set of system appraisal approach to... |
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