Ultra-deep-seated and low-permeable thickened oil identified viscosity reduction method

• Main Authors: ZHAO HONGYU, SHI JUNPING, WU ZHAOHUI, YIN XIAOMEI, WANG YIPING, SUI YONGTING, DENG HONGWEI, LU YANQIU, LI WEIZHONG, WU GUANGHUAN, LIANG JINPING, LI WEI, LI HONGYI, YANG YANXIA, WANG CHUANFEI, CHEN GUIHUA
• Format: Patent
• Language: English
• Published: 19.08.2015
• Subjects: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The present invention provides an ultra-deep-seated and low-permeable thickened oil identified viscosity reduction method. The method comprises a first step of continuously injecting an oil soluble viscosity reducer into a shaft, a second step of continuously squeezing liquid carbon dioxide into the shaft after finishing injecting the oil soluble viscosity reducer, a third step of performing soaking for the first time, a fourth step of continuously injecting high temperature antiexpansion and steam into the shaft after the soaking is completed, and a fifth step of performing soaking for the second time and opening the well for production after the soaking is completed. With adoption of the ultra-deep-seated and low-permeable thickened oil identified viscosity reduction method, the viscosity of crude oil of ultra-deep-seated and low-permeable thickened oil storage can be greatly reduced, periodically development effects are raised, economic producing of the ultra-deep-seated and low-permeable thickened oil storage can be realized, a reserve utilization degree and a recovery efficiency can be raised.