Environmentally Friendly Shale Inhibitor TIL-NH2 for Shale Gas Wells
Author Information
Author(s): Tian Yuexin, Liu Xiangjun, Liu Yintao, Dong Haifeng, Zhang Guodong, Su Biao, Liu Xiaofeng, Hu Yifan, Huang Jinjun, Lu Zeze
Primary Institution: Petroleum Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC
Hypothesis
Can TIL-NH2 effectively inhibit shale hydration swelling and improve wellbore stability in shale gas drilling?
Conclusion
TIL-NH2 significantly reduces shale hydration swelling and enhances wellbore stability while being environmentally friendly.
Supporting Evidence
- TIL-NH2 reduced the linear swelling height of shale by 65.69% at a concentration of 1.2 wt%.
- At 140 °C, the cuttings rolling recovery rate of TIL-NH2 reached 88.12%.
- TIL-NH2 achieved a permeability recovery rate of 90.58% at a concentration of 2.0 wt%.
- TIL-NH2 has a degradation rate exceeding 90% within 28 days.
- The LC50 of TIL-NH2 is 1080.3 mg/L, significantly lower than KCl's 385.4 mg/L.
Takeaway
TIL-NH2 is a new type of shale inhibitor that helps keep shale stable when drilling, and it's good for the environment.
Methodology
The study involved synthesizing TIL-NH2 and evaluating its performance through various tests including linear swelling, rolling recovery, and permeability recovery experiments.
Digital Object Identifier (DOI)
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