煤层气井压裂曲线和储层污染程度的响应关系

为了研究压裂曲线与储层污染程度的响应关系，以沁水盆地柿庄区块为例，在区块内选取储层敏感性强弱不同的井，通过比较各井压裂施工曲线中油压曲线到达破裂压力后下降行迹特征的差异，总结出油压曲线下降行迹与储层敏感性的响应规律。然后在同一区块内根据油压曲线下降行迹判定几口井的储层敏感性，根据储层渗透率损害比模型计算出几口井开发煤层段的储层渗透率损害比。结果发现，预测出的储层敏感性强井具有较高的储层渗透率损害比，储层受到严重污染；储层敏感性弱井储层受到轻度污染。研究表明油压曲线到达破裂压力点后的下降行迹能够反映储层污染程度，可以为后期工程开发提供依据。 

Response relation between fracturing curve and reservoir pollution degree of coalbed methane wells

In order to study the relationship between response curve and the pollution degree of fractured reservoir, taking Shizhuang block in Qinshui basin as an example, wells with different sensitivity of reservoir in the block were selected, through comparison of the difference of the dropping trace characteristics after the hydraulic curve reaches the fracture pressure in the fracturing curves of fracturing operation in different wells, the response law of hydraulic dropping trace and the reservoir sensitivity was summed up. Then in the same block according to the dropping trace of the hydraulic curves, the sensibility of reservoir was judged in several wells. According to the calculation model of reservoir permeability damage ratio, the permeability damage ratio of several well development sections was calculated. The results found that the wells with strong predicted reservoir sensibility had higher reservoir permeability damage ratio, and reservoir was seriously polluted. Wells with weak reservoir sensibility was slightly polluted. It shows that the dropping trace after the hydraulic curve reaches the fracture pressure can reflect the reservoir pollution degree, and provides the basis for later engineering development.