| Casing failures are already oil productional problems and casing failures speed is increasing with years. Up to the end of December 2000, accumulative total 8976 wells with casing problems had been found in Daqing oilfield. This number is 18.3 percent to water-oil wells which are now on stream. Every six wells which were on stream that one well would be damaged.For many years, domestic and foreign oilfield, scientific institution, colleges and universities have done masses of work on casing failure mechanism, and have summarized some casing failure mechanism scientific payoffs. E.g. strata settlement theory: a stronger tectogenetic movement in the area arose by a mass - production petroleum and underground depletion appearance make water-oil wells deformative. Mudstone expansion theory: water immerging mudstone strata from tiny crack make mudstone strata creep and mass deformative wells are appeared. But these theories develop from the points of determining the natureand single technology. These theories can't satisfy oilfield's needs. In order to deepen the study of casing failure mechanism and protective measures, carrying the study on numerical simulation study from overall situation and system will offer theory gist to ultimately solve the problem of casing failure protection.The subjects involved in this paper are rock mechanics, fluid mechanics in porous medium, theory of elasticity and plasticity, reservoir physics, and so on. This paper builds the mathematical model by studying effect to casing failure brought by injection-production, working, geologic condition. Reducing the virtual seeking for answer and realizing the breakthrough of this theoretic equation from theoretical investigation to technical application, pore medium deformation coupling.This paper carries a history matching of injection-production by studying the 22 wells in North Xing area locating in oil product No.4 of Daqing oilfield. Coincidence rate of wells in calculation to wells in actual is 81.8%.
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