高强度空心玻璃微珠低密度水基钻井液室内研究及应用

高强度空心玻璃微珠钻井液作为连续介质具有不可压缩性，避免了气体钻井流体在使用过程中的诸多缺点，其密度可在0．6～1．0kg／L范围内进行调整，适用于低压油藏钻井和欠平衡钻井。室内试验表明，玻璃微珠钻井液具有良好的配伍性、流变性、滤失性和润滑性，并有利于保护储层，具有可回收利用及对测井无影响等气基钻井流体所不具备的优点，虽然微珠本身成本较高，但由于不需要特殊增压设备，相比空气钻井可以降低设备成本，操作更加安全，因而具有广阔的应用前景。从物理特性、配伍性、流变性调整、储层损害评价以及现场应用等方面对该钻井液进行了较全面的综述和分析。

Lab tests and Applications of the HGS Low-Density Water-Based Drilling Fluid

The hollow glass sphere (HGS) low-density drilling fluids, working as continuous medium, performs incompressible properties and thus avoids many deficiencies of gas drilling fluids. Its density can vary from 0. 6 to 1. 0 kg/L, which is suitable for wells in low pressure reservoirs and underbalanced wells. Lab tests show that the drilling fluid shows good compatibleness, rheology, filtration, and lubricity, and it is helpful to protect pay zones. In addition, the mud has advantages of reutilization and no-effects on logging over gas mud. Although the glass sphere is more expensive, the mud can save equipment costs because there is pressurizing e-quipment compared with gas fluids. It is more safe, and thus it will have splendid applied prospects. The physical properties of HGS, its compatibility with different kinds of drilling fluids and the field applications of this kind of low-density drilling fluid are summarized in this paper.