Abstract
The Zhongjiang tight gas reservoir are characterized by complicated geological condition, high hardness value of rock, high formation pressure and wellbore instability. In the drilling process, it has the problems such as wellbore instability, large friction in long open hole section, low penetration rate in the inclined section and long drilling cycle, which leads to high cost and limited space for cost-reducing optimization and restricts the exploitation benefit of this area. In view of these problems, the main drilling technical difficulties in the target stratum of Shaximiao Formation are summarized. Combined with the drilling practice, the drilling technical solutions for tight and high stressed horizontal well are put forward from the aspects of treating agent for maintaining wellbore stability, horizontal section length, well structure and the mode of well construction, which will provide the technical support for fast drilling, cost saving and efficiency increasing of Zhongjiang Oilfeild.
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