海上钻井岩屑回注地层裂缝扩展研究

Study on Fracture Propagation of Drilling Cuttings Re-injection Offshore

针对海上钻井岩屑回注的裂缝扩展预测问题,考虑了初滤失和后续滤失的影响,提出了物质平衡法预测裂缝扩展的模型并求解。建立了岩屑回注地层概念模型,分别运用物质平衡法和专业的压裂软件FracproPT进行计算。结果表明:物质平衡法和FracproPT预测的缝长和缝宽结果差别分别为5.3%和8.9%。该方法可以为岩屑回注裂缝扩展的预测提供依据。

In order to predict the fracture propagation of drilling cuttings re-injection offshore.Taken initial filtrate loss and following filtrate loss into consideration,the fracture propagation model was forward and solved,using material balance method.A concept formation model was built and solved with both material balance method and professional software FracproPT.The results show that the errors of length and width of the fracture predicted by the two methods were 5.3% and 8.9%.The method could provide evidence for fracture propagation of drilling cuttings re-injection.