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非常規油氣藏多場耦合滲流理論研究進展

Multiphysical field coupling in unconventional oil and gas reservoirs

  • 摘要: 非常規油氣藏是目前世界油氣開發的重點領域,由于非常規油氣藏的儲層條件差,滲流場與應力場、溫度場耦合作用,流體的流動更為復雜,以往對多場耦合理論的運用存在簡易化和適應性缺陷,工程中缺少理論指導下的更有效的開采工藝與開發方法,制約了這類油氣藏的大規模高效開發,亟需對多場耦合滲流力學理論進行深入認識,以對工程問題提供有效指導。從實驗認識、理論分析、仿真模擬三個方面闡述了我國非常規油氣資源開發領域的多場耦合滲流力學理論的研究現狀,重點圍繞多尺度介質力學行為特性表征、巖體和流體的溫度響應機制、耦合作用的概念及數學模型、多場耦合模擬仿真方法等關鍵問題的最新成果、認識展開論述。在此基礎上對地下真實應力及溫度環境的模擬、烴類吸附及置換的熱量測試等問題進行分析,建議針對巖石的塑性應變、重復壓裂后的應力環境變化、混合烴類的輸運模型、以及流動條件隨應力和溫度變化的模型等科學問題進一步深化。旨在為進一步闡明我國非常規油氣藏開發的動用機理、確定高效開發方法提供指導,同時希望能夠促進滲流力學的學科發展。

     

    Abstract: Research in the field of oil and gas development has focused on the production of unconventional reservoirs all over the world. Unconventional oil and gas reservoirs have poor flow conditions, and the interaction of flow, stress, and temperature fields is very complex. Therefore, multiphysical field coupling is essential. The previous application of multiphysical field coupling theory has defects such as oversimplification and inadequate adaptability. Furthermore, the lack of adaptive production practices and effective development plans limits large-scale and efficient development, and there is an urgent necessity to investigate the adaptive multiphysical field coupling theory. Currently, the core rheology in fluid–solid coupling settings can often be measured by a triaxial test system under high temperature and pressure conditions combined with flow experiments. Moreover, the changes in pores and fractures can be tested by micro-CT and SEM. In addition, adsorption is considered an exothermic process, and desorption is deemed a heat-absorbing process, so the reservoir temperature decreases at the location where desorption occurs. Therefore, the production of unconventional oil and gas triggers a series of interactions. As the fluid flows into the wellbore through the fractures, the pressure drop increases the effective stress, decreasing the average pore radius and altering the inherent permeability. Moreover, the change of pressure causes a variation in the micro-flow effect, significantly impacting the apparent permeability, and the heat variation during desorption and adsorption also changes the flow condition as well as the physical properties of the fluid. As a result, these physical fields are closely related. A series of fully coupled partial differential equations are necessary to define the production process by modeling the dynamic porosity and permeability in various flow sectors to distinguish the interactions between different zones and physical fields. These complex interactions generally need to be solved by numerical methods. Thus, a simulator is needed that satisfies the accuracy requirements to match the actual situation. Moreover, adaptability to the decoupling process and acceptable speed requires research for high-performance computing solutions that can perform distributed or cloud computing for a large-scale unconventional reservoir simulation. Future research is necessary for laboratory measurements under realistic stress and temperature environmental conditions of the formation and hydrocarbon adsorption experiments. There should be further understanding of scientific issues such as the plastic strain of the porous rocks, changing stress environment after refracturing, and mixed hydrocarbon transport models with varying stress and temperature. This article further clarifies the dynamics and determines effective production methods of unconventional reservoirs in China to promote the development of flow mechanics.

     

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