Abstract
The effective utilization of reserves in tight sandstone reservoirs is one of the major concerns in terms of the development of tight sandstone gas reservoirs. However, the characteristics of reserve utilization are not fully understood, and many uncertainties still exist in the process. For this purpose, long cores on the Su 6 block of Sulige tight sandstone gas field in China were selected, and a multipoint embedded measurement system was established to study the characteristics of effective reserve utilization. Then, the effects of the related reservoir properties and production parameters were investigated. Based on the similarity theory, the effective conversion relationship between the physical experiment and the actual field production was established. The results showed that the pressure distribution in the exploitation of tight gas reservoir is nonlinear, and water cut in the reservoir will hinder the effective utilization of reserves. The lower the reservoir permeability, the larger the negative effect of water on reservoir utilization. Lower gas production rate and higher original pressure are associated with a smoother drawdown curve, which results in larger reserve utilization. The moving boundary expands with time, and its initial propagation velocity increase and then decrease. Additionally, the water cut in the reservoir can delay the spread of moving boundary propagation. The experimental results are consistent with the actual results of the field production by the similarity criterion, which can reflect and predict the production performance in tight gas reservoirs effectively. These results can provide a better understanding of reservoir pressure distribution and effective utilization of reserves to optimize the gas recovery and development benefit in tight sandstone gas reservoirs.
Highlights
Tight sandstone gas reservoirs are widely distributed throughout the world with huge resource potential, which is playing an increasingly important role among energy sources [1, 2]
Based on the above study, the effective conversion relationship between the physical experiment and the actual field production was established by the dimensional analysis, and the experimental results were transformed into the actual field production
The dry and irreducible water conditions were compared to study the effect of water saturation on reserve utilization in tight gas reservoirs
Summary
Tight sandstone gas reservoirs are widely distributed throughout the world with huge resource potential, which is playing an increasingly important role among energy sources [1, 2]. The efficient development of tight sandstone gas is of great significance to the implementation of China’s natural gas strategy [4]. Due to the geological characteristics with low porosity, low permeability, and high water saturation, as well as the development characteristics of threshold pressure gradient, Klinkenberg effect, and stress sensitivity, the propagation law of the pressure disturbance in tight sandstone reservoirs significantly differs from conventional gas reservoirs [7, 8]. The characteristics of pressure propagation and pressure distribution in tight sandstone reservoirs are the direct reflection on the effective utilization range and utilization degree of the reservoir, which is the theoretical basis for cognizing geofluid flow characteristics, gas production calculation, and well testing in gas reservoirs [9]. There is great significance to understand the effective utilization of reserves for gas productivity and optimize the effective development in tight gas reservoirs
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