新疆大倾角煤层多缝和有效支撑压裂技术研究

新疆阜康白杨河矿区煤层具有大倾角、多煤层、大厚度的地质特点，煤层压裂裂缝扩展规律、裂缝形态等与其他地区有较大差异，影响单井产量的因素及规律也不明确，导致在沁水盆地南部及鄂尔多斯盆地东缘成功应用的“套管完井、清水加砂压裂”等改造技术适应性不强，后期部分井压裂后产量较低。因此，攻关低煤阶大倾角厚煤层增产改造优化技术，探索大倾角、多煤层、大厚度煤层气压裂裂缝扩展规律，提高区块煤层气产量，对国内类似特征煤层气增产改造具有重大意义。开展了大尺寸真三轴压裂物理模拟实验，得到了最大主应力沿地层走向方向、地层倾向方向2种地应力条件下的压裂裂缝扩展结果，总结了2种地应力下裂缝沟通规律。研究为国内类似特征煤层气提供了相应的钻井轨迹设计参考。

Research on multi fracture and effective supporting fracturing technology in large dip coal seam of Xinjiang

The coal seam of Baiyanghe Mining Area in Fukang，Xinjiang has the geological characteristics of "large dip angle，multiple coal seams and large thickness".There are great differences in fracture propagation law and fracture morphology between Baiyanghe Mining Area of Fukang，Xinjiang and other areas，and the influencing factors and rules of single well production are not clear，which leads to the poor adaptability of "casing completion，clean water and sand fracturing" successfully applied in the south of Qinshui Basin and the eastern edge of Ordos Basin，and the production of some wells after fracturing is low.Therefore，it is of great significance to explore the propagation law of gas pressure crack in "large dip angle，multi seam，large thickness" coal seam for the production increase and transformation of similar characteristics of coalbed methane in China.A large-scale true triaxial fracturing physical model experiment was carried out，and the fracture propagation results under the conditions of the maximum principal stress along the formation strike direction and the maximum principal stress along the formation dip direction were obtained.The fracture propagation laws under the two kinds of in-situ stresses were summarized，and the corresponding drilling trajectory design suggestions for similar characteristics of coalbed methane in China were put forward.