化学胶塞在控制压裂裂缝高度中的探索与应用

Exploration and Application of Chemical Rubber Plug in Artificial Crack Height Control Technology

针对水力压裂过程中,人工裂缝在纵向上延伸失控导致压窜水层、沟通距离受限的问题,开展了化学胶塞控缝高工艺技术研究。采用物理和数学模型实验进行了化学胶塞控缝高的可行性研究,明确了化学胶塞控缝高的最佳黏度范围,研发了100℃,170 s^(-1)下剪切20 min内黏度大于1000 mPa·s,90 min后最终黏度保持在650 mPa·s以上,交联时间5~10 min,破胶水化时间50~90 min可控的高黏化学胶塞体系,配套形成了化学胶塞控缝高的工艺技术。该技术现场应用2井次,控缝高、延缝长效果明显,对底水油藏的高效动用具有重要的指导意义。

In view of the uncontrolled extension of artificial cracks in the longitudinal direction leading to the pressure channeling water layer and the limited communication distance in the process of hydraulic fracturing,a technology for controlling the crack height with chemical rubber plugs was carried out.The feasibility of chemical rubber plugs to control artificial crack height was studied by using physical and digital model experiments,the optimum viscosity range of chemical plug control crack morphology was clarified.The chemical rubber plug with high viscosity has been developed with more than 1000 mPaos after shearing at 100℃and 170 s^(-1) within 20 min,final viscosity keeping above 650 mPaos within 90 min,and crosslinking time of 5-10 min and gelation time of 50-90 min.On this basis,the process technology of controlling the crack height of chemical rubber plug is formed and performed in two wells with obvious good effect of crack height controlling and slot length extending,which has important guiding significance for the efficient development of reservoirs with bottom water.