Method for determining reasonable soaking time of shale gas well

• Main Authors: LI YUNXIANG, LI JIYU, CAO WANGKUN, ZOU SHUNLIANG, YAN MAOLING, WANG YUNCHUAN, RUAN YUJIE, TANG XINGYU, LIU YUANYANG, DANG KAIYU, CHEN MINGJUN, KANG YILI
• Format: Patent
• Language: Chinese; English
• Published: 19.12.2023
• Subjects: CALCULATING; COMPUTING; COUNTING; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; ELECTRIC DIGITAL DATA PROCESSING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PHYSICS

The invention discloses a method for determining reasonable soaking time of a shale gas well. The method comprises the following steps: selecting a rock core sample; measuring to obtain the porosity of the rock core sample; simulating the state of the first core sample in the reservoir; methane is injected to reach the reservoir pore pressure; injecting simulated fracturing fluid into the core holder; measuring a resistivity change curve of the first rock core sample; measuring and obtaining the half-life period of pressure attenuation of the first pressure sensor until an inflection point appears on the resistivity change curve of the first rock core sample; the experiment duration of the shortest pressure attenuation half-life period of the first rock core sample and the second rock core sample is obtained; obtaining time points when the rock core nuclear magnetic signal change amplitudes of the first rock core sample and the second rock core sample are maximum; the soaking time under the rock core scale is