Most of oil fields in China have been in the mediate and later production stages during which flowing pressure and hence the production zones produce usually in the form of oil, gas and water three-phase flows. In three phase flows, the difference among oil, gas and water properties such as density, viscosity and in -site velocity causes the complex response of production logging tool (spinner flowmeter, watercut meter). Consequently, how to determine the accurage oil, gas and water production rates of each perforated interval is a key problem in the comprehensive interpretation of production logs and well performance monitoring.
Based on experimental result from flow loop, theoretical analysis as well as practical data, the paper presents a new practical data, the paper presents a new interpretive method for three phase flow with the inflatable diverter production logging instrument and the new response equations of water cut tool and spinner flowmeter in multiphase flow, and how to use production logging data for determining flow patter is also given in this paper.
The field example from Chinese oil field has demonstrated the dependability of the developed method, and the interpretation results are considerably satisfied.
The object of the interpretation of production logs in three-phase flows is production logs in three-phase flows is to determine the production of oil, gas and water for each layer in a producing well of multi-layers, and producing performance of oil layers. The logging performance of oil layers. The logging suite consists of a flowmeter, a densitymeter, a watercut meter, a temperature meter and a pressure meter. With the logging data from a flowmeter, the total hydrocarbon output of each layer is determined. With the temperature, pressure and surface properties of oil, gas and water, the properties of oil, gas and water, the performance of oil, gas and water under performance of oil, gas and water under the subsurface conditions is determined. And the holdups of oil, gas and water is determined with density and water cut logs.
There have occurred no mature interpretative methods for three phase flow wells. Based on the experiments and theoretical analysises, this paper concludes that the interpretation problem for three phases flows could be problem for three phases flows could be resolved with the fluid-collecting production logging suite. And an production logging suite. And an interpretation model is given in the paper. paper. P. 229