Research Institute of Petroleum Engineering of Jiangsu Oilfield

Yangzhou, China

Research Institute of Petroleum Engineering of Jiangsu Oilfield

Yangzhou, China
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He Z.,Research Institute of Petroleum Engineering of Jiangsu Oilfield
Petroleum Refinery Engineering | Year: 2014

In drilling the Well Fenghuang-Xl into the Paleozoic formation, 1,454 m3 of drilling fluids were lost into the formation, and time spent reaming the borehole was 910 hours. This paper discusses the downhole troubles and the treatment, and analyzes the causes which give rise to these troubles. It is concluded that the fissures and fractures developed in the igneous rocks and coal beds of the Paleozoic formation, and low strengths of the formations drilled have caused mud losses during drilling. Caving and collapse of the Permian and Carboniferous formations led to the block of the hole. The collapsed rocks are very hard, made it difficult to break and carry out of the hole, resulting in high friction and torques. Suggestions about drilling in this area are presented in the discussion.


Yang X.,Research Institute of Petroleum Engineering of Jiangsu Oilfield | Li S.,Research Institute of Petroleum Engineering of Jiangsu Oilfield | Yan J.,Research Institute of Petroleum Engineering of Jiangsu Oilfield | Lin Y.,Research Institute of Petroleum Engineering of Jiangsu Oilfield | Wang X.,Research Institute of Petroleum Engineering of Jiangsu Oilfield
Drilling Fluid and Completion Fluid | Year: 2014

Precise prediction of circulation temperatures in horizontal wellbore plays a significant role in bottom hole pressure control and safe, fast drilling because of the narrow safe mud density window in horizontal drilling. A model for mud circulation temperature prediction in vertical, buildup and horizontal sections of a well is established based on conventional borehole temperature calculation and modeling, the basic principle of heat transfer, and energy equilibrium theory. An error of 0.6% was produced of this model compared with temperatures actually measured for the studied borehole. The calculation and analysis show that annular temperature gradually increases above the end of kick-off point, and the ESD gradually decreases from the start point of the horizontal section, and ECD, on the contrary, gradually increases along the horizontal section, and reaches a maximum at the bottom of the hole.


He Z.,Research Institute of Petroleum Engineering of Jiangsu Oilfield | Shi Z.,Research Institute of Petroleum Engineering of Jiangsu Oilfield | Sun X.,Research Institute of Petroleum Engineering of Jiangsu Oilfield
Drilling Fluid and Completion Fluid | Year: 2014

In drilling the Well Fenghuang-X1 into the Paleozoic formation, 1,454 m3 of drilling fluids were lost into the formation, and time spent reaming the borehole was 910 hours. This paper discusses the downhole troubles and the treatment, and analyzes the causes which give rise to these troubles. It is concluded that the fissures and fractures developed in the igneous rocks and coal beds of the Paleozoic formation, and low strengths of the formations drilled have caused mud losses during drilling. Caving and collapse of the Permian and Carboniferous formations led to the block of the hole. The collapsed rocks are very hard, made it difficult to break and carry out of the hole, resulting in high friction and torques. Suggestions about drilling in this area are presented in the discussion.

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