Prediction of wax precipitation region in wellbore during deep water oil well testing
During deep water oil well testing, the low temperature environment is easy to cause wax precipitation, which affects the normal operation of the test and increases operating costs and risks. Therefore, a numerical method for predicting the wax precipitation region in oil strings was proposed based...
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KeAi Communications Co., Ltd.
2018-04-01
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Series: | Petroleum Exploration and Development |
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doaj-2c3cdaae70bb4cc5b682b8252d55d71c2021-02-02T03:01:12ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042018-04-01452351357Prediction of wax precipitation region in wellbore during deep water oil well testingYonghai GAO0Kai LIU1Xinxin ZHAO2Hao LI3Yanchun CUI4Guizhen XIN5Baojiang SUN6School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China; National Engineering Laboratory for Testing and Detection Technology of Subsea Equipments, Qingdao 266580, ChinaSchool of Petroleum Engineering, China University of Petroleum, Qingdao 266580, ChinaSchool of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China; National Engineering Laboratory for Testing and Detection Technology of Subsea Equipments, Qingdao 266580, ChinaSchool of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China; National Engineering Laboratory for Testing and Detection Technology of Subsea Equipments, Qingdao 266580, ChinaSchool of Petroleum Engineering, China University of Petroleum, Qingdao 266580, ChinaSchool of Petroleum Engineering, China University of Petroleum, Qingdao 266580, ChinaSchool of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China; National Engineering Laboratory for Testing and Detection Technology of Subsea Equipments, Qingdao 266580, China; Corresponding authorDuring deep water oil well testing, the low temperature environment is easy to cause wax precipitation, which affects the normal operation of the test and increases operating costs and risks. Therefore, a numerical method for predicting the wax precipitation region in oil strings was proposed based on the temperature and pressure fields of deep water test string and the wax precipitation calculation model. And the factors affecting the wax precipitation region were analyzed. The results show that: the wax precipitation region decreases with the increase of production rate, and increases with the decrease of geothermal gradient, increase of water depth and drop of water-cut of produced fluid, and increases slightly with the increase of formation pressure. Due to the effect of temperature and pressure fields, wax precipitation region is large in test strings at the beginning of well production. Wax precipitation region gradually increases with the increase of shut-in time. These conclusions can guide wax prevention during the testing of deep water oil well, to ensure the success of the test. Key words: deep water oil and gas development, oil well testing, wellbore wax precipitation, temperature field, pressure field, wax precipitation region predictionhttp://www.sciencedirect.com/science/article/pii/S1876380418300399 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yonghai GAO Kai LIU Xinxin ZHAO Hao LI Yanchun CUI Guizhen XIN Baojiang SUN |
spellingShingle |
Yonghai GAO Kai LIU Xinxin ZHAO Hao LI Yanchun CUI Guizhen XIN Baojiang SUN Prediction of wax precipitation region in wellbore during deep water oil well testing Petroleum Exploration and Development |
author_facet |
Yonghai GAO Kai LIU Xinxin ZHAO Hao LI Yanchun CUI Guizhen XIN Baojiang SUN |
author_sort |
Yonghai GAO |
title |
Prediction of wax precipitation region in wellbore during deep water oil well testing |
title_short |
Prediction of wax precipitation region in wellbore during deep water oil well testing |
title_full |
Prediction of wax precipitation region in wellbore during deep water oil well testing |
title_fullStr |
Prediction of wax precipitation region in wellbore during deep water oil well testing |
title_full_unstemmed |
Prediction of wax precipitation region in wellbore during deep water oil well testing |
title_sort |
prediction of wax precipitation region in wellbore during deep water oil well testing |
publisher |
KeAi Communications Co., Ltd. |
series |
Petroleum Exploration and Development |
issn |
1876-3804 |
publishDate |
2018-04-01 |
description |
During deep water oil well testing, the low temperature environment is easy to cause wax precipitation, which affects the normal operation of the test and increases operating costs and risks. Therefore, a numerical method for predicting the wax precipitation region in oil strings was proposed based on the temperature and pressure fields of deep water test string and the wax precipitation calculation model. And the factors affecting the wax precipitation region were analyzed. The results show that: the wax precipitation region decreases with the increase of production rate, and increases with the decrease of geothermal gradient, increase of water depth and drop of water-cut of produced fluid, and increases slightly with the increase of formation pressure. Due to the effect of temperature and pressure fields, wax precipitation region is large in test strings at the beginning of well production. Wax precipitation region gradually increases with the increase of shut-in time. These conclusions can guide wax prevention during the testing of deep water oil well, to ensure the success of the test. Key words: deep water oil and gas development, oil well testing, wellbore wax precipitation, temperature field, pressure field, wax precipitation region prediction |
url |
http://www.sciencedirect.com/science/article/pii/S1876380418300399 |
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