Oleic acid mixture based heavy oil modification and mixed-phase thermal fluid flooding combined oil extraction method

Abstract

The invention relates to the technical field of oil field exploitation, in particular to an oleic acid mixture based heavy oil modification and mixed-phase thermal fluid flooding combined oil extraction method. The method includes: 1) injecting an oleic acid mixture into an oil reservoir through an injection well to enable underground cracking modification reaction between oleic acid and crude oil; 2) closing after determining that the injected oleic acid mixture reaches a preset range; 3) after closing time reaches a preset range, performing oil flow production; 4) pumping until oil discharging stops; 5) putting an underground mixed-phase thermal fluid generator in the injection well, arranging a matched ground supply system, starting underground generation of mixed-phase thermal fluid to carry out a flooding oil extraction step, and extracting the crude oil from a production well. The method can be applied to primary oil extraction of heavy oil and super-heavy oil reservoirs and is also available for tertiary oil extraction of the heavy oil and super-heavy oil reservoirs and capable of increasing heavy oil and super-heavy oil extraction ratio and reducing oil extraction cost.

Description

Technical field [0001] The invention relates to the technical field of oil production in oil fields, and in particular to an oil displacement method using oleic acid mixture heavy oil upgrading combined with miscible hot fluid. Background technique [0002] Heavy oil has high heavy content, high viscosity, poor fluidity and other characteristics, which makes the production of heavy oil more difficult than ordinary crude oil. However, the viscosity of heavy oil is very sensitive to temperature. Thermal oil recovery methods are usually considered as heavy oil production. The most effective method for oil reservoirs, most of China’s oil fields use steam huff and puff to extract heavy oil, and good economic benefits have been achieved. However, under the conditions of steam injection, the viscosity of the heavy oil decreases only temporarily, as the heat in the process of injection and exploitation Loss, the temperature drops, and the viscosity of heavy oil gradually rises, which bri...

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Problems solved by technology

[0002] Heavy oil has high heavy content, high viscosity, poor fluidity and other characteristics, which make the recovery of heavy oil more difficult than that of ordinary crude oil. However, the viscosity of heavy oil is very sensitive to temperature. The most effective method for oil reservoirs. Most oilfields in my country use steam huff and puff to exploit heavy oil, which has achieved good economic benefits. However, under the condition of steam injection, the viscosity drop of heavy oil is only temporary. Loss, temperature drops, and the viscosity of heavy oil gradually rises, which brings certain difficulties to wellbore lifting and ground operations

[0003] For primary oil recovery of heavy oil and ultra-heavy oil reservoirs, since crude oil has almost no fluidity in the formation, high injection pressure, poor well connectivity, low recovery, and oil recovery will occur when traditional thermal recovery methods are used for oil recovery. Slow speed and other problems, and the cost of oil recovery is high

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