| Title | Research on Transforming Abandoned and Low-production wells into Geothermal Wells in Oil-Gas Field in Northwestern Ordos Basin |
|---|---|
| Authors | Hong Guo, Qian Gao, Jian Jun Huang, Hong Quan Teng, Er Liang An, Jian Qiang Liu, Guang Jin |
| Year | 2023 |
| Conference | World Geothermal Congress |
| Keywords | Ordos Basin; abandoned wells; Geothermal wells; Engineering transformation; Deep borehole heat exchanger; coaxial casing heat exchanger; Pilot test |
| Abstract | After years of production, there are a large number of abandoned and low-production wells in oil and gas fields in the northwest of the Ordos Basin. Transforming those wells into geothermal wells could not only utilize abandoned wells and reduce pollution, but also greatly reduce the cost of exploring and developing geothermal wells. According to geothermal geological data and structure characteristics of oil and gas wells in the study area, the advantages and disadvantages of various heat exchanging methods were compared and analyzed. The deep borehole heat exchanger (coaxial casing heat exchanger) technology was selected to transfer the oil wells into geothermal wells. As an example of studying, the well name of Cheng 49-24 was selected to carry out corresponding analyses. Using numerical simulation methods, main factors affecting the heat transfer performance of the well were analyzed, the long-term heat transfer performance of the well was predicted, and a re-construction plan was made. On-site construction and heating pilot tests were carried out. The construction purpose and requirements were successfully achieved, and the pilot test also achieved good results. Such renovation and study were the first time that the deep borehole heat exchanger technology was used to develop geothermal resources in oil and gas fields in Ordos Basin. The feasibility of renovation plan and corresponding technology were studied. A relatively complete set of well renovation technology was formed. The studied case could act as an example for similar projects. In addition, it could help oilfields achieve low-carbon heating, and provide new methods for petroleum industry to utilize geothermal resources in oil and gas fields. |