НАУКИ О ЗЕМЛЕ. Геомеханика, разрушение горных пород
Hou Bing, Li Dandan, Chen Mian, Liang Chuan, Jin Yan
HOU BING, PhD, Associate professor, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China, e-mail: houbing9802@163.comLI DANDAN, Master Candidate, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China, e-mail: wilber-will@163.com
CHEN MIAN, Professor, Dean, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China. Key Laboratory of Reservoir Stimulation, CNPC, Langfang, China, e-mail: chenmian@vip.sina.com
LIANG CHUAN, PhD Candidate, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China, e-mail: liangchuan@gmail.com
JIN YAN, Professor, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China, e-mail: 13701222683@vip.163.com
The sensibility of mechanical behavior to loading rate for shale gas reservoir with different weak planes
Triaxial compression tests are performed on shale samples from Longmaxi reservoir formation with GCTS RTR1500 mechanical testing system. The failure modes and mechanical parameter sensitivity characteristics of shale under different loading rates are investigated. Longmaxi shale gas reservoir is well-developed laminations, featured by matrix and fractures, which has been called “dual pore structure”, and is dramatically sensitive to loading rates. The relationship between compressive strength and loading rate is generally linear under different conditions of weak plane angles (β), yet in the meanwhile, elastic modulus manifests obviously nonlinear. When the loading rate is increased from 0.05 mm/min to 0.2 mm/min, specimens with the angle βof 30° has the largest growth amplitude , reaching to 17.16%, while the β =70° group has the largest amplification in elastic modulus. Moreover, elastic modulus is most sensitive to the loading rate at 0.12 mm/min. Since then, this trend is beginning to stabilize. Specially, shear failure is in charge under the rate of 12 mm/min, while tensing cracks begin to increase as loading rates going up.
Key words: shale, weak plane, triaxial test, loading rate, dual pore structure.
Скачать статью в формате PDF (скачать Adobe Acrobat Reader)