Chemical temporary plugging shielding well repairing method for heavy oil thermal production well

• Main Authors: ZHOU XIAOYI, XIAN JU, WU FAN, TONG YUBAO, WANG MEICHENG, LIU CHONGYONG, XIAO XIANDONG, WANG JIANGUO, XIAO YI, YANG SHUBO, SHAN ZHAOHUI, YANG YUYAO, GE JIJIANG
• Format: Patent
• Language: Chinese; English
• Published: 17.02.2023
• 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 relates to the technical field of oil exploitation, in particular to a chemical temporary plugging shielding well repair method for a heavy oil thermal production well, which utilizes a high-molecular polymer to form a temporary plugging rubber plug in the well to shield underground pressure, and comprises the following steps of: firstly, cleaning and cooling an oil casing by adopting deoiled hot water; then prepad fluid, a temporary plugging agent prepared from a cross-linking agent and a high-molecular polymer and displacing fluid are sequentially injected into the well through an oil casing annulus, the temporary plugging agent is coagulated into gel underground, the underground pressure shielding condition is judged according to the numerical value displayed by a pressure gauge arranged on the oil casing, conventional well killing fluid is injected for balancing when excessive pressure exists in the well, and after well repairing operation is completed, the temporary plugging agent and the d