大庆油田高密度油包水钻井液技术研究与应用

Research and Application of High-density Water-in-oil Drilling Fluid Technology in Daqing Oilfield

摘要:

针对大庆油田朝503区块地层压力高、地层流体活跃、水平井施工难度大的特点，通过室内实验，将原有的低粘高切油包水钻井液体系配方进行了改进完善，使其在密度上限达到200 g/cm3时，油水比可控范围90∶10～75∶25，仍然具有良好的流变性、电稳定性和沉降稳定性。经过在朝42-平125井的应用，满足现场的施工要求，保证了井下安全。

Abstract:

According to the characteristics of high formation pressure, active formation fluid and difficult construction for horizontal wells in 503 block of Daqing oilfield and by the laboratory experiments, the original low-viscosity water-in-oil drilling fluid system formula has been optimized so that when the upper limit of density reaches 200g/cm3, the controllable range of oil-water ratio is from 75∶25 to 90∶10, and the drilling fluid still has good rheology, electrical stability and sedimentation stability. By the application in well Chao42-P125, the construction requirements are met and downhole safety is ensured.