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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。
Aiming at the problem of low productivity caused by high energy gas fracturing applied to coalbed methane wells, a new type of high energy gas fracturing device for coalbed methane wells is designed to increase production. The relationship between fluid pressure and temperature is studied based on the theory of supercritical CO2 fluid properties. The membrane rupture pressure was calculated by empirical formula and the relationship between supercritical CO2 fluid pressure and rupture pressure was determined. The experimental results show that the peak pressure of the fracturing device reaches 90 MPa under the action of 75 g heating agent and 1.25 kg CO2, the maximum temperature in the tube reaches 453 K, and the 2 mm thick membrane can be broken. Theoretical analysis and experimental results provide a theoretical and experimental basis for further optimization of heating dose, CO2 content and membrane thickness, and provide more precise technical support for the design and process optimization of the fracturing device.