LAPSE:2023.32129
Published Article
LAPSE:2023.32129
Experimental Study on Reservoir Physical Properties and Formation Blockage Risk in Geothermal Water Reinjection in Xining Basin: Taking Well DR2018 as an Example
April 19, 2023
Abstract
The Xining Basin in Qinghai Province, China, is rich in mid−low temperature geothermal resources, but the reinjection of geothermal water has not yet started. In this paper, the physical properties of rocks sampled from the newly drilled geothermal well DR2018 were analyzed, and a series of core flooding experiments was conducted to assess the formation blockage risk during water reinjection. The experimental results show that the geothermal reservoir has a low porosity of 1.64−18.68% and a low permeability of 0.04−7.23 md. The rocks are weakly consolidated, and the movable clay and sand particles account for 0.18−23.42 wt %, which results in a significant rate and salinity sensitivity. Even at low water flow velocity of 0.31−1.64 cm/min, the core permeability will drop by 35−53% after 25-144PV injection. An obvious fluctuation and decline in core permeability can also be observed as the injected water salinity decreases. The blockage risk induced by the invasion of low-content scaling and suspended particles in injected water can be covered up by the migration of movable particles in cores. The particle migration and blockage in the near-wellbore formation will be the main reason to cause the decline in the well’s geothermal reinjection capacity.
The Xining Basin in Qinghai Province, China, is rich in mid−low temperature geothermal resources, but the reinjection of geothermal water has not yet started. In this paper, the physical properties of rocks sampled from the newly drilled geothermal well DR2018 were analyzed, and a series of core flooding experiments was conducted to assess the formation blockage risk during water reinjection. The experimental results show that the geothermal reservoir has a low porosity of 1.64−18.68% and a low permeability of 0.04−7.23 md. The rocks are weakly consolidated, and the movable clay and sand particles account for 0.18−23.42 wt %, which results in a significant rate and salinity sensitivity. Even at low water flow velocity of 0.31−1.64 cm/min, the core permeability will drop by 35−53% after 25-144PV injection. An obvious fluctuation and decline in core permeability can also be observed as the injected water salinity decreases. The blockage risk induced by the invasion of low-content scaling and suspended particles in injected water can be covered up by the migration of movable particles in cores. The particle migration and blockage in the near-wellbore formation will be the main reason to cause the decline in the well’s geothermal reinjection capacity.
Record ID
Keywords
blockage mechanism, geothermal water reinjection, movable particles, risk assessment
Suggested Citation
Zhao Z, Qin G, Luo Y, Geng S, Yang L, Wen R, Chao J, Zhang L. Experimental Study on Reservoir Physical Properties and Formation Blockage Risk in Geothermal Water Reinjection in Xining Basin: Taking Well DR2018 as an Example. (2023). LAPSE:2023.32129
Author Affiliations
Zhao Z: Qinghai Bureau of Environmental Geology Exploration, Xining 810001, China; Key Laboratory of Environmental Geology of Qinghai Province, Xining 810001, China; Qinghai 906 Engineering Survey and Design Institute, Xining 810001, China
Qin G: Qinghai Bureau of Environmental Geology Exploration, Xining 810001, China; Key Laboratory of Environmental Geology of Qinghai Province, Xining 810001, China; Qinghai 906 Engineering Survey and Design Institute, Xining 810001, China
Luo Y: Qinghai Bureau of Environmental Geology Exploration, Xining 810001, China; Key Laboratory of Environmental Geology of Qinghai Province, Xining 810001, China; Qinghai 906 Engineering Survey and Design Institute, Xining 810001, China
Geng S: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China; Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Yang L: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China; Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Wen R: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China; Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Chao J: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China; Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Zhang L: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China; Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China [ORCID]
Qin G: Qinghai Bureau of Environmental Geology Exploration, Xining 810001, China; Key Laboratory of Environmental Geology of Qinghai Province, Xining 810001, China; Qinghai 906 Engineering Survey and Design Institute, Xining 810001, China
Luo Y: Qinghai Bureau of Environmental Geology Exploration, Xining 810001, China; Key Laboratory of Environmental Geology of Qinghai Province, Xining 810001, China; Qinghai 906 Engineering Survey and Design Institute, Xining 810001, China
Geng S: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China; Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Yang L: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China; Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Wen R: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China; Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Chao J: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China; Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Zhang L: School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China; Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China [ORCID]
Journal Name
Energies
Volume
14
Issue
9
First Page
2671
Year
2021
Publication Date
2021-05-06
ISSN
1996-1073
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PII: en14092671, Publication Type: Journal Article
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LAPSE:2023.32129
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https://doi.org/10.3390/en14092671
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Apr 19, 2023
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