Abstract:

There are two problems in the understanding of oil well productivity in the high-productivity pilot block of fault-karst reservoirs in Shunbei oil & gas field: First, the formation pressure fluctuates obviously after well testing, so the conventional method for well test interpretation is no longer applicable; second, the productivity index curve determined based on well test data is nonlinear, so the oil production index method is unsuitable for quantitatively evaluating the oil well productivity. In order to realize quantitative evaluation of the productivity of the oil wells in Shunbei oil & gas field, based on the correction to well test data for estimating the fluctuating productivity in the systematic well test stage, we proposed a new method for evaluating the productivity of the oil wells, which includes exponential productivity equation, comprehensive oil production index, and productivity division standard. Field application has proved the systematic well test data correction method and the productivity evaluation method are suitable for quantitatively evaluating the productivity of the oil wells in Shunbei oil & gas field, which provide a theoretical basis for the quantitative understanding of the productivity of the oil wells in Shunbei oil & gas field.

Key words: Shunbei oil & gas field, fault-karst reservoir, systematic well testing, productivity evaluation, oil production index method, exponential productivity equation, nonlinear inertial resistance, comprehensive oil production index