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首页> 外文期刊>Arabian Journal for Science and Engineering >Experimental Investigation of Hydraulic Fracturing for Multi‑type Unconventional Gas Co‑exploitation in Ordos Basin
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Experimental Investigation of Hydraulic Fracturing for Multi‑type Unconventional Gas Co‑exploitation in Ordos Basin

机译：鄂尔多斯盆地多类型非常规天然气联合开采水力压裂试验研究

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摘要

The accumulated gas production and production cycle would be significantly increased by exploiting the unconventional gas resources of coalbed methane and tight gas jointly in coal measure strata ( tight gases-coal interbedding reservoir) in Ordos Basin in China. However, whether hydraulic fractures could connect multiple gas zones effectively in the vertical plane is a key problem. To study hydraulic fracture geometries and vertical propagation rules for coal measure strata, six groups of true triaxial experiments in natural outcrops collected from the eastern margin of Ordos Basin in China were carried out. Results show that unlike conventional symmetric fracture geometry in layered media, the principle of fracture vertical propagation in coal measure strata follows the least resistance and most preferential propagation path. The natural fractures and cleats in coal seam make the overall fracture morphology asymmetric. A moderate stress difference between vertical stress and maximum horizontal stress (4 MPa in this paper) is the key for connection of multiple layers as well as SRV enhancement. Developed natural fractures and bedding planes in interlayer could alter fracture extension path and impede hydraulic fracture crossing layer interface. In the process of hydraulic fracture propagating from interlayer to layer interface and then to the coal seam, the fluid pressure in hydraulic fractures is characterized by an apparent fluctuation of decreasing first and increasing later. Furthermore, the greater the elastic modulus of the interlayer, the greater the pump pressure fluctuations.
机译：通过在中国鄂尔多斯盆地的煤系地层（致密气-煤层间储层）中联合利用煤层气和致密气的非常规天然气资源，可以显着增加天然气的累计生产周期。但是，水力压裂能否在垂直面上有效地连接多个气层是一个关键问题。为了研究煤系地层的水力压裂几何形状和垂直传播规律，对鄂尔多斯盆地东缘天然露头进行了六组真三轴试验。结果表明，与常规的层状介质对称裂缝几何结构不同，煤层中裂缝垂直传播的原理遵循最小的阻力和最优先的传播路径。煤层中的天然裂缝和割理使整体裂缝形态不对称。垂直应力和最大水平应力之间的适度应力差（本文中为4 MPa）是多层连接以及SRV增强的关键。中间层中发育的自然裂缝和层理面可能会改变裂缝延伸路径并阻碍水力裂缝穿越层界面。在水力压裂从层间界面扩展到煤层的过程中，水力压裂中的流体压力的特征是表观波动先减小后增加。此外，中间层的弹性模量越大，泵压力波动越大。

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