Abstract: Sweep volume is one of important index in description of oilfield development, and its evaluation of cal-culation may be used as guide for oilfield development regulatory measures. The Block Wen No.5 is one of high-eff-ciency development block of Turpan-Hami oilfield. As the oilfield has entered the middle w ater- cut stage, the produc-tion decline amplitude has increased. So it is necessary to find out succeed output stabilizing measurement, and to tap the production potential further. This paper conducted calculation of current sweep performance by three methods, and predicted the maximum swept volume.

Key words: sweep efficiency, material balance method, inspecting well, oil displacment efficiency