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压裂开发和区块整体压裂要求压裂液在低成本投入下,既能满足油藏特点和工艺技术要求,又能最大限度地减少压裂液对支撑裂缝导流能力的影响。介绍了压裂液优化设计技术,即压裂液及其添加剂优选、压裂过程的温度场计算、压裂液植物胶分散水合及充分增粘、压裂液变组分配方性能优化等。该技术是将同一口井的压裂液根据需要设计成不同阶段、不同组分,精确控制各种添加剂的加入使压裂液性能达到优化。室内实验结果表明,相同条件的压裂液,常规使用和按压裂液优化设计变化组分使用岩心的动态滤失伤害可由40％降到14％。该项技术在吐哈鄯善油田整体重复压裂中应用成功,效益显著。
Fracturing development and overall block fracturing require fracturing fluid to meet the reservoir characteristics and technical requirements at low cost while minimizing the impact of fracturing fluid on the supporting fracture conductivity. The optimal design technology of fracturing fluid is introduced, which is the optimization of fracturing fluid and its additive, the calculation of temperature field in fracturing process, the dispersion and hydration of fracturing fluid plant gum, and the full thickening of fracturing fluid. The technology is the same well fracturing fluid designed according to different needs of different stages, different components, precise control of various additives to make the performance of the fracturing fluid to be optimized. Laboratory experiments show that the dynamic filtration loss of core fracturing fluid under the same conditions, conventional use and fracturing fluid optimization design change components can be reduced from 40% to 14%. The technique has been applied successfully in the overall repeated fracturing of Tuhazhanshan Oilfield, with significant benefits.