Application of Deconvolution Well Test Technology in Low Permeability Gas Reservoir

When establishing a well test interpretation model, it is always assumed that the production of the test well is constant, but the production is difficult to maintain stable in actual tests. Conventional well test interpretation generally deals with the problem of variable rate (multi-rate) by superposition principle. The results are satisfactory for the case of small change in rate, but for the long-term rate changes greatly, the bottom hole pressure is sensitive to the rate, the error of the superposition processing method is enhanced, and the pressure response curves are disordered and difficult to explain. The deconvolution method optimizes the measured data and obtains the ideal pressure changes to a constant production for the same period. So the pressure response of a whole test procedure could be obtained, and there is no effects of simplified production and superposition calculation, also no errors caused by incomplete production history. Compared with conventional well test, deconvolution well test can get more reservoir information, gain more and much reliable results. Field example shows that deconvolution technology makes up for the shortcomings of conventional well test interpretation techniques in interpreting long-term variable rate data. Deconvolution well test technology can effectively eliminate the multiplicity problem of conventional well test interpretation, improve the accuracy of reservoir evaluation, reduce the test time of the build-up period, thus improving economic benefits. It can be popularized and applied in the initial stage of oil and gas exploration and development.