Abstract
As the depth and horizontal length of shale gas development wells increase, the requirement for the temperature resistance and the ability of the drilling fluids to stabilize the shale formation becomes higher. A new type of high temperature and high density white oil based drilling fluid system has been developed in laboratory. Research shows that the drilling fluid system has good rheological property, low filtration loss, strong anti-debris pollution capability and good plugging performance at high temperature and high density. The system has been successfully applied in the 201H7-6 well. Application results show that the drilling fluid rheology, high temperature and high pressure fluid loss and demulsification voltage meet the field requirements. The drilling fluid performance is stable in drilling an 1800 m horizontal section, and no stuck or shale swelling and wellbore collapsing are induced. It is the first well drilled successfully with domestic white oil-based drilling fluid in Zigong Region. It also sets several new records including the deepest well, the shortest drilling cycle, and the fastest drilling speed in that region, which provides valuable experience for the future drilling activities.
Highlights
The geological structure of Zigong Area is complex, and there are many layers with high fluid loss risk, high formation pressure and hydrogen sulfide
A new type of high temperature and high density white oil based drilling fluid system has been developed in laboratory
Based on the design methodology of drilling fluid system discussed in the previous sections, investigations and optimizations are conducted on the key treatment agents such as emulsifier, wetting agent, fluid loss additive and plugging agent
Summary
The geological structure of Zigong Area is complex, and there are many layers with high fluid loss risk, high formation pressure and hydrogen sulfide. Based on the encountered difficulties such as high wellbore pressure, thin thickness of the production box and complicated trajectory of the wellbore, the performance of the drilling fluid is adjusted, which leads to smooth construction of the well with high quality and high efficiency It sets several records including the deepest drilling depth, the shortest drilling cycle, and the fastest drilling speed of Sichuan Company, and it is the first successful application of white oil-based drilling fluid in the area. It provides valuable experience for future well construction in the region, which strongly supports the efficient development of the block
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