Research and Performance Evaluation of Environmentally Friendly Shale Inhibitor TIL-NH<sub>2</sub> for Shale Gas Horizontal Wells
Wellbore instability caused by hydration during the development of shale gas reservoirs poses significant challenges to drilling engineering. In this study, a novel and environmentally friendly shale inhibitor, TIL-NH<sub>2</sub>, was synthesized via free radical polymerization using 1-v...
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2024-12-01
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| Series: | Molecules |
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| author | Yuexin Tian Xiangjun Liu Yintao Liu Haifeng Dong Guodong Zhang Biao Su Xiaofeng Liu Yifan Hu Jinjun Huang Zeze Lu |
| author_facet | Yuexin Tian Xiangjun Liu Yintao Liu Haifeng Dong Guodong Zhang Biao Su Xiaofeng Liu Yifan Hu Jinjun Huang Zeze Lu |
| author_sort | Yuexin Tian |
| collection | DOAJ |
| description | Wellbore instability caused by hydration during the development of shale gas reservoirs poses significant challenges to drilling engineering. In this study, a novel and environmentally friendly shale inhibitor, TIL-NH<sub>2</sub>, was synthesized via free radical polymerization using 1-vinylimidazole and N-(2-bromoethyl)-1,3-propanediamine dihydrobromide as the main raw materials. The molecular structure of TIL-NH<sub>2</sub> was characterized by infrared spectroscopy and nuclear magnetic resonance. Incorporating imidazole cations and amino bifunctional groups, TIL-NH<sub>2</sub> exhibits excellent inhibitory performance and environmental friendliness. Its performance was systematically evaluated through linear swelling tests, shale cuttings rolling recovery tests, permeability recovery experiments, and dynamic adsorption analyses. The results indicate the following: (1) At a concentration of 1.2 wt%, TIL-NH<sub>2</sub> reduced the linear swelling height of shale by 65.69%, significantly outperforming traditional inhibitors like KCl and NW-1. (2) Under conditions of 140 °C, the cuttings rolling recovery rate of TIL-NH<sub>2</sub> reached 88.12%, demonstrating excellent high-temperature resistance. (3) Permeability recovery experiments showed that at a concentration of 2.0 wt%, TIL-NH<sub>2</sub> achieved a permeability recovery rate of 90.58%, effectively mitigating formation damage. (4) Dynamic adsorption experiments indicated that at a concentration of 2.5 wt%, the adsorption capacity tended toward saturation, reaching 26.00 mg/g, demonstrating stable adsorption capability. Additionally, environmental friendliness evaluations revealed that TIL-NH<sub>2</sub> has a degradation rate exceeding 90% within 28 days, and its acute toxicity is significantly lower than that of traditional inhibitors like KCl (the LC<sub>50</sub> of TIL-NH<sub>2</sub> is 1080.3 mg/L, whereas KCl is only 385.4 mg/L). This research provides a high-efficiency and environmentally friendly new inhibitor for green drilling fluid systems in horizontal shale gas wells, offering important references for technological advancements in unconventional energy development. |
| format | Article |
| id | doaj-art-1f6a24ae4f9d46db955d164e2f46ab7d |
| institution | DOAJ |
| issn | 1420-3049 |
| language | English |
| publishDate | 2024-12-01 |
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| spelling | doaj-art-1f6a24ae4f9d46db955d164e2f46ab7d2025-08-20T02:43:49ZengMDPI AGMolecules1420-30492024-12-012924595010.3390/molecules29245950Research and Performance Evaluation of Environmentally Friendly Shale Inhibitor TIL-NH<sub>2</sub> for Shale Gas Horizontal WellsYuexin Tian0Xiangjun Liu1Yintao Liu2Haifeng Dong3Guodong Zhang4Biao Su5Xiaofeng Liu6Yifan Hu7Jinjun Huang8Zeze Lu9Petroleum Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC, Deyang 618000, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaPetroleum Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC, Deyang 618000, ChinaPetroleum Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC, Deyang 618000, ChinaPetroleum Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC, Deyang 618000, ChinaPetroleum Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC, Deyang 618000, ChinaPetroleum Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC, Deyang 618000, ChinaPetroleum Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC, Deyang 618000, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaChangqing Down Hole Technology Company, CCDC, Xi’an 710000, ChinaWellbore instability caused by hydration during the development of shale gas reservoirs poses significant challenges to drilling engineering. In this study, a novel and environmentally friendly shale inhibitor, TIL-NH<sub>2</sub>, was synthesized via free radical polymerization using 1-vinylimidazole and N-(2-bromoethyl)-1,3-propanediamine dihydrobromide as the main raw materials. The molecular structure of TIL-NH<sub>2</sub> was characterized by infrared spectroscopy and nuclear magnetic resonance. Incorporating imidazole cations and amino bifunctional groups, TIL-NH<sub>2</sub> exhibits excellent inhibitory performance and environmental friendliness. Its performance was systematically evaluated through linear swelling tests, shale cuttings rolling recovery tests, permeability recovery experiments, and dynamic adsorption analyses. The results indicate the following: (1) At a concentration of 1.2 wt%, TIL-NH<sub>2</sub> reduced the linear swelling height of shale by 65.69%, significantly outperforming traditional inhibitors like KCl and NW-1. (2) Under conditions of 140 °C, the cuttings rolling recovery rate of TIL-NH<sub>2</sub> reached 88.12%, demonstrating excellent high-temperature resistance. (3) Permeability recovery experiments showed that at a concentration of 2.0 wt%, TIL-NH<sub>2</sub> achieved a permeability recovery rate of 90.58%, effectively mitigating formation damage. (4) Dynamic adsorption experiments indicated that at a concentration of 2.5 wt%, the adsorption capacity tended toward saturation, reaching 26.00 mg/g, demonstrating stable adsorption capability. Additionally, environmental friendliness evaluations revealed that TIL-NH<sub>2</sub> has a degradation rate exceeding 90% within 28 days, and its acute toxicity is significantly lower than that of traditional inhibitors like KCl (the LC<sub>50</sub> of TIL-NH<sub>2</sub> is 1080.3 mg/L, whereas KCl is only 385.4 mg/L). This research provides a high-efficiency and environmentally friendly new inhibitor for green drilling fluid systems in horizontal shale gas wells, offering important references for technological advancements in unconventional energy development.https://www.mdpi.com/1420-3049/29/24/5950shalewellbore stabilityinhibitorinhibitory performanceenvironmental friendliness |
| spellingShingle | Yuexin Tian Xiangjun Liu Yintao Liu Haifeng Dong Guodong Zhang Biao Su Xiaofeng Liu Yifan Hu Jinjun Huang Zeze Lu Research and Performance Evaluation of Environmentally Friendly Shale Inhibitor TIL-NH<sub>2</sub> for Shale Gas Horizontal Wells Molecules shale wellbore stability inhibitor inhibitory performance environmental friendliness |
| title | Research and Performance Evaluation of Environmentally Friendly Shale Inhibitor TIL-NH<sub>2</sub> for Shale Gas Horizontal Wells |
| title_full | Research and Performance Evaluation of Environmentally Friendly Shale Inhibitor TIL-NH<sub>2</sub> for Shale Gas Horizontal Wells |
| title_fullStr | Research and Performance Evaluation of Environmentally Friendly Shale Inhibitor TIL-NH<sub>2</sub> for Shale Gas Horizontal Wells |
| title_full_unstemmed | Research and Performance Evaluation of Environmentally Friendly Shale Inhibitor TIL-NH<sub>2</sub> for Shale Gas Horizontal Wells |
| title_short | Research and Performance Evaluation of Environmentally Friendly Shale Inhibitor TIL-NH<sub>2</sub> for Shale Gas Horizontal Wells |
| title_sort | research and performance evaluation of environmentally friendly shale inhibitor til nh sub 2 sub for shale gas horizontal wells |
| topic | shale wellbore stability inhibitor inhibitory performance environmental friendliness |
| url | https://www.mdpi.com/1420-3049/29/24/5950 |
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