低密度水包油钻井液在中原油田水平井的应用

Application of Oil-in-water Low-density Drilling Fluid in Horizontal Wells of Zhongyuan Oilfield

摘要:

根据低压力储层水平井钻井油气层保护要求，通过室内研究形成了密度在0.89~0.99 g/cm3之间可调，具有良好乳化稳定性和流变性，防塌能力强的低密度水包油钻井液配方。在达平1井等井的现场应用中，水包油钻井液性能稳定，易于维护调节，钻井施工安全快速，能够满足低压水平井近平衡、欠平衡钻井和地质要求，保护储层作用明显，收到了良好的应用效果。

Abstract:

To satisfy the requirements of protecting hydrocarbon reservoir of low pressure reservoir horizontal well, by means of research in laboratory, oil-in-water drilling fluid formula with variable density in 0.89~0.99g/cm3was obtained. This oil-in-water lowdensity drilling fluid has good capability of emulsion stability, rheological property and anti-sloughing property. The result of application in Daping #1 well showed that the drilling fluid has stable property and can be simply maintained and adjusted for safe and fast drilling operation. It also can satisfy the demands of near-balanced drilling & underbalanced drilling for low pressure horizontal well and geologic requirement. There are obvious effects for hydrocarbon reservoir protection.