Interference Test and Pulse Test
The purpose, development history, test design method, data acquisition and interpretation methods, and typical field examples of their application of the interference test between wells or layers and pulse test are introduced in this chapter. Because the interference test can be used to solve many problems about the connectivity between wells or layers and to obtain parameters about the connectivity between wells and the size of the connected area in the reservoir, they are very effective methods in dynamic study. However, there are some special difficulties and special requirements in data acquisition and operation in the field that cause the success rate of the data acquisition of these tests to be low. The author makes some suggestions on effective design and operation procedures for a successful interference test on the bases of his own experience accumulated in the field after many years. Some typical field practice examples are given in this chapter, for example, study results of interference tests between wells in the JB gas field made clear the connectivity of thin zones with low permeability in an area 2 km long in the Ordovician formation, but the heterogeneity there is quite serious; the study of interference tests between wells in the SLG gas field probed into the characteristics of lithological boundaries of the fluvial facies deposited in sandstone in the Permian system formation; and the study of interference tests in the SL gas field provided some results, such as conforming the sealing of some faults and anisotropy of the permeability.