科研之友
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摘要
The tight sandstone gas in Sulige of the Ordos Basin is the core object of natural gas development in PetroChina Changqing Oilfield, and it has been known as the "revolution on the grindstone" for a long time due to the small size of effective sandbody, strong reservoir heterogeneity and tight physical property. In order to solve the problem of complex seepage that water production is common during the multi-layer commingled production of Sulige tight sandstone gas reservoir by horizontal wells, this paper analyzes the vertical superimposition types of sandbodies in Sulige tight sandstone gas reservoir. Based on this, the conventional experimental method of multi-layer commingled production is broken through, and the experimental procedure for the depletion development of complex gas reservoir with double-layer flow and multi-point pressure measurement is designed. In addition, a dynamic physical simulation experiment for the double-layer development with gas-water interaction crossflow under different development modes is developed. And the following research results are obtained. First, the phenomenon of gas-water interaction crossflow between layers is common during the multi-layer commingled production of the tight sandstone gas reservoir with gas layers interactively superimposing with water layers. Second, vertical reservoir heterogeneity, water saturation and development mode are the most important factors influencing the two-phase interaction crossflow between layers, which directly affect the recovery rate of gas reservoir. Third, the permeability ratio of high water cut layer (60%< Sw< 100%) to gas layer is higher during the multi-layer commingled production, and the inhibitory effect of inter-layer interference on gas reservoir production gets stronger in the middle and late stages of production, so it is necessary to take the corresponding treatment measures. Fourth, when a low-permeability gas layer and a tight water layer (permeability< 0.1 mD) are coproduced, no serious water channeling is observed, which has less impact on the overall recovery factor of gas reservoir and makes it easy to achieve efficient development of gas reservoir. In conclusion, the research results of simulation experiment provide a new idea and a new technology for the efficient development of Sulige tight sandstone gas reservoir and are of important practical significance in improving the recovery factor of tight gas reservoirs and of reference significance to the efficient development of other tight gas fields.
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