Origins of and countermeasures for the abnormal pressures in well production of the Ojarly gas field in the Right Bank of the Amu-Darya River, Turkmenistan
The Ojarly gas field, the major supplier of the Project Phase Ⅱ of the Right Bank of the Amu Darya River, is just small but valuable like a golden bean, although it has good reservoir properties and a high gas production capacity, the occurrence of continuous sharp decline of pressure in the well pr...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2017-01-01
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| Series: | Natural Gas Industry B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S235285401730061X |
| _version_ | 1797281920990576640 |
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| author | Peijun Zhang Yijun Gao Cuirong Wan Ronghe Liu Li Zhang Hongxi Li |
| author_facet | Peijun Zhang Yijun Gao Cuirong Wan Ronghe Liu Li Zhang Hongxi Li |
| author_sort | Peijun Zhang |
| collection | DOAJ |
| description | The Ojarly gas field, the major supplier of the Project Phase Ⅱ of the Right Bank of the Amu Darya River, is just small but valuable like a golden bean, although it has good reservoir properties and a high gas production capacity, the occurrence of continuous sharp decline of pressure in the well production shows a great difference from the previous well test program. In view of this, an integrated analysis method was established for the whole gas well production process to discover the three main reasons causing the abnormal well pressure. First, the formation energy and pressure dropped so fast that the wellhead pressure also fell over the period. Second, there was abnormal fluids pressure drop in the wellbore tube and throttling effect might occur in the production tube, so the pressure drop became abnormally increased. Third, due to the abnormally-increasing gas-yield pressure drop and unusually-decreasing gas productivity, the wellhead oil pressure dropped significantly. Also, through dynamic monitoring and in-depth analysis, it is also considered that due to the high density of drilling fluids and well-developed pores and caverns in the reservoirs, more and more barites separated from the fluids would be settled down covering the pay zones, so both the gas-generating capacity and production pressure significantly decreased. On this basis, some technical countermeasures were taken such as re-stimulation of reservoirs, removal of gas-producing channels, increase of seepage capacity, etc. In addition, by use of sand-flushing and acidizing, both the comprehensive skin factor and the production pressure drop were reduced to improve the well gas production capacity and maintain high productivity effectively. This study provides a technical support for long-term sustainable development and production of this gas field. |
| first_indexed | 2024-03-07T17:04:26Z |
| format | Article |
| id | doaj.art-05a37bb76b5248219e6755de2c19b8e6 |
| institution | Directory Open Access Journal |
| issn | 2352-8540 |
| language | English |
| last_indexed | 2024-03-07T17:04:26Z |
| publishDate | 2017-01-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Natural Gas Industry B |
| spelling | doaj.art-05a37bb76b5248219e6755de2c19b8e62024-03-03T02:45:19ZengKeAi Communications Co., Ltd.Natural Gas Industry B2352-85402017-01-0141485510.1016/j.ngib.2017.07.007Origins of and countermeasures for the abnormal pressures in well production of the Ojarly gas field in the Right Bank of the Amu-Darya River, TurkmenistanPeijun Zhang0Yijun Gao1Cuirong Wan2Ronghe Liu3Li Zhang4Hongxi Li5CNPC Turkmenistan Amu Darya Natural Gas Company, Beijing 100101, ChinaResearch Institute of Geological Exploration and Development, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, Sichuan 610051, ChinaChongqing Department of PetroChina Southwest Oil & Gas Field Company, Chongqing 400021, ChinaResearch Institute of Geological Exploration and Development, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, Sichuan 610051, ChinaResearch Institute of Geological Exploration and Development, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, Sichuan 610051, ChinaResearch Institute of Geological Exploration and Development, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, Sichuan 610051, ChinaThe Ojarly gas field, the major supplier of the Project Phase Ⅱ of the Right Bank of the Amu Darya River, is just small but valuable like a golden bean, although it has good reservoir properties and a high gas production capacity, the occurrence of continuous sharp decline of pressure in the well production shows a great difference from the previous well test program. In view of this, an integrated analysis method was established for the whole gas well production process to discover the three main reasons causing the abnormal well pressure. First, the formation energy and pressure dropped so fast that the wellhead pressure also fell over the period. Second, there was abnormal fluids pressure drop in the wellbore tube and throttling effect might occur in the production tube, so the pressure drop became abnormally increased. Third, due to the abnormally-increasing gas-yield pressure drop and unusually-decreasing gas productivity, the wellhead oil pressure dropped significantly. Also, through dynamic monitoring and in-depth analysis, it is also considered that due to the high density of drilling fluids and well-developed pores and caverns in the reservoirs, more and more barites separated from the fluids would be settled down covering the pay zones, so both the gas-generating capacity and production pressure significantly decreased. On this basis, some technical countermeasures were taken such as re-stimulation of reservoirs, removal of gas-producing channels, increase of seepage capacity, etc. In addition, by use of sand-flushing and acidizing, both the comprehensive skin factor and the production pressure drop were reduced to improve the well gas production capacity and maintain high productivity effectively. This study provides a technical support for long-term sustainable development and production of this gas field.http://www.sciencedirect.com/science/article/pii/S235285401730061XTurkmenistanRight Bank of the Amu-Darya RiverOjarly gas fieldWellhead pressure abnormalComprehensive analysis of the whole processBarite precipitationProducing layer buriedSand-flushingAcidizing |
| spellingShingle | Peijun Zhang Yijun Gao Cuirong Wan Ronghe Liu Li Zhang Hongxi Li Origins of and countermeasures for the abnormal pressures in well production of the Ojarly gas field in the Right Bank of the Amu-Darya River, Turkmenistan Natural Gas Industry B Turkmenistan Right Bank of the Amu-Darya River Ojarly gas field Wellhead pressure abnormal Comprehensive analysis of the whole process Barite precipitation Producing layer buried Sand-flushing Acidizing |
| title | Origins of and countermeasures for the abnormal pressures in well production of the Ojarly gas field in the Right Bank of the Amu-Darya River, Turkmenistan |
| title_full | Origins of and countermeasures for the abnormal pressures in well production of the Ojarly gas field in the Right Bank of the Amu-Darya River, Turkmenistan |
| title_fullStr | Origins of and countermeasures for the abnormal pressures in well production of the Ojarly gas field in the Right Bank of the Amu-Darya River, Turkmenistan |
| title_full_unstemmed | Origins of and countermeasures for the abnormal pressures in well production of the Ojarly gas field in the Right Bank of the Amu-Darya River, Turkmenistan |
| title_short | Origins of and countermeasures for the abnormal pressures in well production of the Ojarly gas field in the Right Bank of the Amu-Darya River, Turkmenistan |
| title_sort | origins of and countermeasures for the abnormal pressures in well production of the ojarly gas field in the right bank of the amu darya river turkmenistan |
| topic | Turkmenistan Right Bank of the Amu-Darya River Ojarly gas field Wellhead pressure abnormal Comprehensive analysis of the whole process Barite precipitation Producing layer buried Sand-flushing Acidizing |
| url | http://www.sciencedirect.com/science/article/pii/S235285401730061X |
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