压裂充填井开采海上天然气水合物的技术可行性

Zhiyong Huang, B. Guo, Ellis Ekhator
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引用次数: 2

摘要

本文分析了采用压裂充填完井技术开采海上天然气水合物气藏的可行性。以南海北部天然气水合物成藏为例进行了研究。可行性分析包括支撑剂尺寸、流体注入速度、压裂压力和油井产能等要求。研究地层沉积物的中位粒径为2.60 ~ 28.96 μm,平均值为8.49 μm,所需支撑剂粒径范围为333目~ 748目(0.001英寸~ 0.003英寸)。由于这种尺寸范围的支撑剂还没有商业化,因此在压裂充填作业中使用筛选过的天然砂作为支撑剂是经济的。将0.003英寸支撑剂/砂带入510英尺裂缝尖端所需的压裂液的最小流速为3.64 bpm,远低于20至100 bpm的实际值。因此,在压裂充填过程中,支撑剂/砂粒输运不需要考虑。为了在压裂液注入速度为72bpm的情况下形成一条半径510英尺的水平裂缝,预计井底最大注入压力为2378 psi,仅比储层压力高334 psi,大多数压裂充填作业中使用的泵都可以处理。通过简化数学模型进行的产能预测表明,当裂缝半径为510英尺时,商业产气量可达到16百万立方英尺/天。然而,该模型还需要进一步验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Technical Feasibility of Using Frac-Packed Wells for Producing Natural Gas from Offshore Gas Hydrate Reservoirs
This paper presents a feasibility analysis of using frac-packing completion techniques to produce natural gas from offshore gas hydrate reservoirs. A case study was carried out for the gas hydrate accumulations in the northern South China Sea. The feasibility analysis covers the requirements of proppant size, fluid injection rate, fracturing pressure, and well productivity. For the median grain size of sediments in the studied formation from 2.60 to 28.96 μm with an average value of 8.49 μm, the required range of proppant size is between 333 mesh to 748 mesh (0.001 inch ~ 0.003 inch). Since the proppants in this size range are not commercially available, it would be economical to use screened natural sands as proppants in frac-packing operations. The minimum flow rate of fracturing fluid required to carry the 0.003 inch proppant/sand into the fracture tip at 510 ft is 3.64 bpm, which is much lower than the practical values ranging from 20 bpm to 100 bpm. Therefore proppant/sand transport during frac-packing is not a concern. To create a horizontal fracture of 510 ft radius with a fracturing fluid injection rate of 72 bpm, the maximum bottom hole injection pressure is predicted to be 2,378 psi, which is only 334 psi above the reservoir pressure and can be handled by most pumps used in frac-packing operations. Well productivity forecast with a simplified mathematical model shows that a commercial gas production rate of 16 MMscf/day is achievable with the fracture radius of 510 ft. However, the model requires further validation.
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