煤粉沉积对支撑剂充填裂缝导流能力的影响
Influence of pulverized coal deposition on proppant-filled fracture conductivity
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摘要: 为研究水力压裂过程中产出的煤粉沉积对支撑剂充填裂缝导流能力的影响机制，有效优化煤层气井的排采机制；运用支撑剂充填裂缝内多相流实验平台，制定相应的实验方案，针对煤层气井排采过程中产出的煤粉造成的支撑剂充填裂缝导流能力伤害问题进行实验研究。研究结果表明：悬浮煤粉质量分数越大，支撑剂充填裂缝出水时间越晚，出水点处压差值越大；且随着悬浮煤粉质量分数增大，裂缝内的煤粉沉积量呈线性增长趋势，煤粉沉积率先急剧增长到最大值后缓慢下降，支撑剂充填裂缝渗透率及导流能力呈下降趋势。Abstract: In order to study the influence mechanism of pulverized coal deposition produced in the process of hydraulic fracturing on the conductivity of proppant-filled fracture and effectively optimize the drainage mechanism of coalbed methane wells, the proppant-filled fracture multiphase flow experimental platform is used to formulate the corresponding experimental scheme. The damage of proppant filling fracture conductivity caused by pulverized coal produced in the drainage and production of coalbed methane wells is experimentally studied. The results show that the greater the mass fraction of suspended pulverized coal, the later the water outlet time of proppant-filled fracture, and the greater the pressure difference at the water outlet point; with the increase of suspended pulverized coal mass fraction, the pulverized coal deposition in the fracture shows a linear growth trend. The pulverized coal deposition first increases sharply to the maximum value and then decreases slowly. The permeability and conductivity of proppant filled fracture show a downward trend.
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Keywords:
- hydraulic fracturing /
- proppant-filled fracture /
- pulverized coal /
- deposition /
- conductivity
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