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| Geological characteristics of Well Wanjingdi 2 and drilling strategy in Southern Anhui of Lower Yangtze region |
| GUO Jun1, LI Yan1, WANG Wenbin1, WANG Chaoji2 |
1. Geological New Energy Exploration and Development Engineering Technology Research Center of Hunan Province, Coal Geological Exploration Institute of Hunan Province, Hunan Changsha 410014, China;
2. Coal Geological Bureau in Anhui Province in the Third Exploration Team, Anhui Suzhou 234000, China |
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Abstract There are two sets of hydrocarbon accumulation systems in Southern Anhui namely, Triassic Yinkeng Formation and Permian Dalong Formation-Longtan Formation. However, this region has developed complex structures and faults, and the soft and hard formations were interlaced with frequent changes. Various complex situ-ations such as reduced diameter, lost circulation, wall collapse and stuck drill often occurred, and there is a high-pressure gas layer locally, which has caused huge challenges during drilling construction. By adopting the technical measures of plugging while drilling, composite plugging, special shale-coring bit, hybrid bit and strong inhibitory drilling fluid, the optimal and fast drilling has been realized in Well Wanjingdi 2, so the drilling cycle has been shortened by 24 days. Besides, the elastic and ductile double condensation and double density cementing technology was used to guarantee the cementing quality of production casing, which provides technical guarantee for the next stage of fracturing and gas testing. This technical system can provie some valuable references for similar drilling projects in the future.
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Received: 19 March 2021
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2021, Vol. 8 
