Deep fractured formation leakage pressure prediction method and system considering fracture surface friction and slip

• Main Authors: DING WENLI, GU XINMENG, CAO LINGLONG, YOU XIAOMING, WEI RUITONG, HAO HONGDA, DENG SONG, LI CHAOWEI, QI XUAN, LI QIU, YAN XIAOPENG, LIU CHENGGUO, WANG JIANGSHUAI
• Format: Patent
• Language: Chinese; English
• Published: 05.04.2024
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention discloses a deep fractured formation leakage pressure prediction method and system considering fracture surface friction sliding, and relates to the technical field of well drilling in the petroleum and natural gas industry, and the method comprises the steps: determining the pore pressure of a leakage formation of a target area where fracture surface friction sliding is liable to occur and the initial width of a leakage fracture of a potential leakage formation of a research area; the plugging shear strength of the drilling fluid under the initial width is measured, and a columnar standard fracture core plunger with the initial fracture surface friction sliding amount is prepared; applying pressure to the columnar standard crack core plunger, monitoring the flow passing through the crack core plunger in the pressurizing process, calculating the plugging shear strength corresponding to the crack width of the rock sample in the final stage, and finally realizing the pressure prediction of the for