Based On The Single Well Tracer Formation Heterogeneity Explain Method Research

As a result of the formation heterogeneous and difficulty in cognition, the distribution of subterranean oil and water turns complicated, and the difficulty of tapping the latent power increases in the production tail. It is the main current approach to evaluate the formation heterogeneous through well logging, coring, numerical stimulation and the single tracer interpretation. The limits of the well logging and coring are the boundedness of the test specification, and only the vertical distribution of permeability near the wellbore can be offered. And the numerical simulation method depends on history matching which it is difficult to adjust the scope.The tracer test is divided into the interwell tracer test and the single well tracer test, and both can be used to obtain the formation heterogeneous of large area. The construction cycle of the interwell tracer test is too long, it may last about several mouths or maybe more. And the technology is complicated and more harshly the construction site requires. On the contrary, the single well tracer test has the advantage such as the construction cycle is short.the cost is low,the monitor is simple and convenient, the area of the monitor is large and can be adjusted, the range of application is large, the test is agile and accurate. And all these makes the single well tracer test an ideal approach to measure the formation heterogeneous.howeverIn this paper, further research on single well tracer test interpretation has been done, and the achievement is listed as below:(1) A new and more integrated single tracer flow infiltrating fluid mathematical model is established, which is established on tracer influent mechanization and the affects of detergency, counter flow and adherence. And based on Darcy equation, Fick equation and the Freundlich equation.(2)A new single well tracer mathematical model for the matching of the formation heterogeneous parameters is established, which is based on the concept of the single well tracer test, and the model is composed by the injection period, the shut in period and the recovery period.(3)A program about single well test interpretation for measuring formation heterogeneous is compiled through the c sharp program Language, and operates smoothly.(4)The single well test interpretation for measuring formation heterogeneous has been tested and verified through the two high permeability zone model and the two high permeability zone model under different working system, and as the results suggest that error between observed value and calculated value is less, the single well test interpretation for measuring formation heterogeneous is demonstrated to be reliable.(5)A sensitivity analysis is implemented on the slug volume of the injection area, the duration of the well shut in,the permeability ratio of the high permeability zone,the dispersivity of the tracer, the average drift velocity during the well shut in. And Elaborate the work system and the formation parameter which fits the single well test interpretation for measuring formation heterogeneous. (6)A brief description on the character of the single well tracer, the in office analysis and the process program of the single well tracer is implemented.