| Geological Publishing House, Institute of Exploration Technology, Chinese Academy of Geological Sciences | Host |
| Citation: |
WU Ji-xiu, ZHANG Yong-qin, LIANG Jian, LI Kuan, LI Xin-miao, WANG Han-bao. Analysis on Wall Stability of Gas Hydrate Drilling Test Well in Qiangtang Basin of Tibet[J]. DRILLING ENGINEERING, 2014, (6): 8-13. doi: 10.3969/j.issn.1672-7428.2014.06.002
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Analysis on Wall Stability of Gas Hydrate Drilling Test Well in Qiangtang Basin of Tibet
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Abstract
Based on three-dimensional fast Lagrangian finite difference method of fluid-solid coupling theory of porous medi-um and elasto-plastic limit equilibrium theory, according to the QK-2 well drilling data of gas hydrate drilling test well in Qiangtang basin, the analysis is made on the mechanism of borehole instability under the condition of seepage and the nu-merical simulation analysis is also made on the wall stability of instable section to learn stress distribution of surrounding rock around the well and deformation laws of borehole collapse or crack in different drilling fluid density.The safe density window of drilling fluid is determined for no formation collapse ( diameter reducing) and no leakage for the gas hydrates drilling test well in Qiangtang basin, so as to provide the evidences for the determination of casing program design and rea-sonable drilling fluid density.-
Keywords:
- gas hydrate /
- drilling /
- well wall stability /
- drilling fluid density window /
- Qiangtang basin
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WU Ji-xiu, ZHANG Yong-qin, LIANG Jian, LI Kuan, LI Xin-miao, WANG Han-bao. Analysis on Wall Stability of Gas Hydrate Drilling Test Well in Qiangtang Basin of Tibet[J]. DRILLING ENGINEERING, 2014, (6): 8-13. doi: 10.3969/j.issn.1672-7428.2014.06.002
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