超临界CO_2在煤层气井压裂技术中的特性研究应用
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摘要
针对高能气体压裂技术应用于煤层气井中出现产能低的问题,设计了一种新型煤层气井高能气体压裂器实现增产的目标,依据超临界CO2流体性质理论研究了流体压力和温度的关系,结合经验公式计算了膜片破膜压力,确定了超临界CO2流体压力与破膜压力的关系。实验结果表明:在75 g的发热药和1.25 kg的CO2作用下,压裂器产生的峰值压力达到90 MPa,管内最大温度达到453 K,可破厚2 mm膜片。理论分析和实验结果为进一步优化发热药量、CO2量和膜片厚度提供了理论和实验基础,为压裂器设计和工艺优化提供更为精确的技术支撑。
For the low productivity of problems for high-energy gas fracturing technology for coal-bed methane wells, designed high-energy gas fracturing device, according to the nature of the theory of supercritical CO2fluid(SC-CO2), establish the relationship between the fluid pressure and temperature of SC-CO2, combined with empirical formulas analysis the factors of rupture pressure, determine the relationship between SC-CO2 pressure and rupture pressure. The results show that: in the role of 75 g gunpowder and 1.25 kg CO2, generated peak pressure fracturing reach 90 MPa, the maximum temperature reached 453 K inside the tube, 2 mm thick diaphragm can be broken. Theoretical analysis and experimental results point to further optimize the relationship between the amount of gunpowder,CO2 amount and thickness of the diaphragm, providing a more accurate technical support for fracturing design and process optimization.
For the low productivity of problems for high-energy gas fracturing technology for coal-bed methane wells, designed high-energy gas fracturing device, according to the nature of the theory of supercritical CO2fluid(SC-CO2), establish the relationship between the fluid pressure and temperature of SC-CO2, combined with empirical formulas analysis the factors of rupture pressure, determine the relationship between SC-CO2 pressure and rupture pressure. The results show that: in the role of 75 g gunpowder and 1.25 kg CO2, generated peak pressure fracturing reach 90 MPa, the maximum temperature reached 453 K inside the tube, 2 mm thick diaphragm can be broken. Theoretical analysis and experimental results point to further optimize the relationship between the amount of gunpowder,CO2 amount and thickness of the diaphragm, providing a more accurate technical support for fracturing design and process optimization.
引文
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