Analysis on the nitrogen drilling accident of Well Qionglai 1 (I): Major inducement events of the accident
Nitrogen drilling in poor tight gas sandstone should be safe because of very low gas production. But a serious accident of fire blowout occurred during nitrogen drilling of Well Qionglai 1. This is the first nitrogen drilling accident in China, which was beyond people's knowledge about the safe...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2015-12-01
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| Series: | Natural Gas Industry B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352854016300018 |
| _version_ | 1797283362936717312 |
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| author | Yingfeng Meng Sujiang Wu Xingyuan Chen Yanping Zhang Zengnian Wang Xinhu Wang |
| author_facet | Yingfeng Meng Sujiang Wu Xingyuan Chen Yanping Zhang Zengnian Wang Xinhu Wang |
| author_sort | Yingfeng Meng |
| collection | DOAJ |
| description | Nitrogen drilling in poor tight gas sandstone should be safe because of very low gas production. But a serious accident of fire blowout occurred during nitrogen drilling of Well Qionglai 1. This is the first nitrogen drilling accident in China, which was beyond people's knowledge about the safety of nitrogen drilling and brought negative effects on the development of gas drilling technology still in start-up phase and resulted in dramatic reduction in application of gas drilling. In order to form a correct understanding, the accident was systematically analyzed, the major events resulting in this accident were inferred. It is discovered for the first time that violent ejection of rock clasts and natural gas occurred due to the sudden burst of downhole rock when the fractured tight gas zone was penetrated during nitrogen drilling, which has been named as “rock burst and blowout by gas bomb”, short for “rock burst”. Then all the induced events related to the rock burst are as following: upthrust force on drilling string from rock burst, bridging-off formed and destructed repeatedly at bit and centralizer, and so on. However, the most direct important event of the accident turns out to be the blockage in the blooie pipe from rock burst clasts and the resulted high pressure at the wellhead. The high pressure at the wellhead causes the blooie pipe to crack and trigged blowout and deflagration of natural gas, which is the direct presentation of the accident. |
| first_indexed | 2024-03-07T17:29:42Z |
| format | Article |
| id | doaj.art-067b39cdfff349aa90cf48b3b7aa1536 |
| institution | Directory Open Access Journal |
| issn | 2352-8540 |
| language | English |
| last_indexed | 2024-03-07T17:29:42Z |
| publishDate | 2015-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Natural Gas Industry B |
| spelling | doaj.art-067b39cdfff349aa90cf48b3b7aa15362024-03-02T18:03:51ZengKeAi Communications Co., Ltd.Natural Gas Industry B2352-85402015-12-012654856410.1016/j.ngib.2015.12.009Analysis on the nitrogen drilling accident of Well Qionglai 1 (I): Major inducement events of the accidentYingfeng Meng0Sujiang Wu1Xingyuan Chen2Yanping Zhang3Zengnian Wang4Xinhu Wang5State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, ChinaCNPC Safety and Environmental Protection Department, Beijing 100007, ChinaCNPC Counseling Center, Beijing 100007, ChinaCNPC Engineering Technology Company, Beijing 100007, ChinaCNPC Engineering Technology Company, Beijing 100007, ChinaCNPC Tubular Goods Research Institute, Xi'an, Shaanxi 710077, ChinaNitrogen drilling in poor tight gas sandstone should be safe because of very low gas production. But a serious accident of fire blowout occurred during nitrogen drilling of Well Qionglai 1. This is the first nitrogen drilling accident in China, which was beyond people's knowledge about the safety of nitrogen drilling and brought negative effects on the development of gas drilling technology still in start-up phase and resulted in dramatic reduction in application of gas drilling. In order to form a correct understanding, the accident was systematically analyzed, the major events resulting in this accident were inferred. It is discovered for the first time that violent ejection of rock clasts and natural gas occurred due to the sudden burst of downhole rock when the fractured tight gas zone was penetrated during nitrogen drilling, which has been named as “rock burst and blowout by gas bomb”, short for “rock burst”. Then all the induced events related to the rock burst are as following: upthrust force on drilling string from rock burst, bridging-off formed and destructed repeatedly at bit and centralizer, and so on. However, the most direct important event of the accident turns out to be the blockage in the blooie pipe from rock burst clasts and the resulted high pressure at the wellhead. The high pressure at the wellhead causes the blooie pipe to crack and trigged blowout and deflagration of natural gas, which is the direct presentation of the accident.http://www.sciencedirect.com/science/article/pii/S2352854016300018Western Sichuan BasinWell Qionglai 1FracturesTight sandstone gas reservoirNitrogen drillingRock burst and blowout by gas bombDeflagrationAccident |
| spellingShingle | Yingfeng Meng Sujiang Wu Xingyuan Chen Yanping Zhang Zengnian Wang Xinhu Wang Analysis on the nitrogen drilling accident of Well Qionglai 1 (I): Major inducement events of the accident Natural Gas Industry B Western Sichuan Basin Well Qionglai 1 Fractures Tight sandstone gas reservoir Nitrogen drilling Rock burst and blowout by gas bomb Deflagration Accident |
| title | Analysis on the nitrogen drilling accident of Well Qionglai 1 (I): Major inducement events of the accident |
| title_full | Analysis on the nitrogen drilling accident of Well Qionglai 1 (I): Major inducement events of the accident |
| title_fullStr | Analysis on the nitrogen drilling accident of Well Qionglai 1 (I): Major inducement events of the accident |
| title_full_unstemmed | Analysis on the nitrogen drilling accident of Well Qionglai 1 (I): Major inducement events of the accident |
| title_short | Analysis on the nitrogen drilling accident of Well Qionglai 1 (I): Major inducement events of the accident |
| title_sort | analysis on the nitrogen drilling accident of well qionglai 1 i major inducement events of the accident |
| topic | Western Sichuan Basin Well Qionglai 1 Fractures Tight sandstone gas reservoir Nitrogen drilling Rock burst and blowout by gas bomb Deflagration Accident |
| url | http://www.sciencedirect.com/science/article/pii/S2352854016300018 |
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