Method for exploiting thickened oil by steam solvent mixed injection

• Main Authors: GOU YAN, SUN XINGE, ZHANG SHENGFEI, ZHANG ZHONGYI, LI XIULUAN, WANG HONGZHUANG, SHEN DEHUANG
• Format: Patent
• Language: Chinese; English
• Published: 14.01.2022
• 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 exploiting thickened oil by steam solvent mixed injection. The method comprises the following steps of: starting to inject a solvent at the early stage of development, firstly performing high-pressure production, and accelerating cavity expansion and oil drainage; performing pressure reduction production at the middle and later stages of development, improving the utilization efficiency of heat energy, and meanwhile strengthening solvent recovery; heating the solvent, performing phase change, enabling the solvent to enter an oil reservoir in a gas phase form, reaching the front edge under the convection action, condensing, mixing with crude oil, and reducing the viscosity of the crude oil; performing steam solvent mixed injection, reducing the partial pressure of steam, improving the dryness, and reducing the heat loss of a pipeline along the way; performing flash evaporation and heat absorption on hot water and the solvent inside a steam cavity in the pressure reduction p