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World Geothermal Congress 2023

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Exploration and Practice of Centralized Sandstone Geothermal Well Group Deployment

In recent years, people have paid more and more attention to the development of medium and deep sandstone-type geothermal resources, and centralized mining has gradually become the norm. In the deployment process of centralized sandstone geothermal well groups, well spacing and well network not only determine the temperature and water level changes of geothermal wells after many years, but also affect the life and economy of geothermal projects. Taking the geothermal project of Caofeidian New City in eastern Hebei as an example, this paper studies the optimization of centralized sandstone-type geothermal mining well network. On the basis of geothermal investigation in the study area, the extraction and recharge test was used to determine that the mining capacity of geothermal wells was 100m3/h and the recharge capacity was 80m3/h. Numerical modeling was used to optimize the distance between geothermal recharge wells to 450 meters, and the network of geothermal recharge wells was deployed according to staggered arrangement. The multi-well pilot test was used to verify the rationality of geothermal well exploitation and recharge, and the operation and maintenance system of geothermal well exploitation and recharge was formulated. Using the modeling of multi-year recharge production data of well groups, it was predicted that the thermal storage seepage field would form a small-scale drop funnel (maximum range of about 300m) during the heating period, and the water level would quickly recover to the initial water level state during the non-heating period. When the model was in operation for 30 years, the temperature drop in the recharge area in the thermal reservoir was 10-40°C, the temperature drop in most areas was about 15°C, and the temperature change at the mining well location was less than 0.5°C. Production practice and numerical model results confirm that the well distance of the project is 450m, and it is feasible to deploy the well network according to staggered arrangement, which provides technical support for the large-scale development of geothermal resources in the future.

ZHOU Hong
Liaohe Oilfield Environmental Engineering Company
China

LI Hongda
Geothermal Project Department of Jidong Oilfield
China

ZHAO Pengfei
China Coal Xi'an Design Engineering Co., Ltd
China

ZHANG Jichang
Liaohe Oilfield Environmental Engineering Company
China

CHEN Xuanyi
College of New Energy and Environment, Jilin University
China

SU Na
Tangshan Jidong Geothermal Energy Development Co., Ltd
China

WU Shaokun
Liaohe Oilfield Environmental Engineering Company
China

 


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