Self-heat-generation viscosity-reduction complexing agent for offshore oilfield thickened oil development and preparation method of self-heat-generation viscosity-reduction complexing agent

In the development of heavy oil in offshore oilfields, the self-generating heat viscosity-reducing composite agent, by combining heat-generating agents and surfactants, solves the problem of low thermal energy utilization, achieves delayed viscosity reduction and expands the heat wave range, and improves the efficiency of heavy oil extraction.

CN120988673APending Publication Date: 2025-11-21CNOOC ENERGY TECHNOLOGY & SERVICES LTD
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Patent Information

Application Number
CN202511438345.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-10
Publication Date
2025-11-21

AI Technical Summary

Technical Problem

In the development of heavy oil in offshore oil fields, hot water carries limited heat, with a small temperature rise range and heating area, which exacerbates reservoir heterogeneity, resulting in low thermal energy utilization and affecting development effectiveness. Furthermore, no reports have been found on composite agents and their preparation methods for existing self-generating heat systems.

Method used

The self-heating viscosity-reducing composite agent, which includes a heat-generating agent, an initiator, a time-delaying catalyst, and a viscosity-reducing system, generates heat and reduces the viscosity of heavy oil through a reaction in the oil well. It also utilizes nonionic and amphoteric surfactants to form a nano-micelle solution, which synergistically enhances the viscosity reduction effect.

Benefits of technology

It achieves delayed reaction, reduces heavy oil viscosity, improves oil washing efficiency, does not damage tubing and downhole equipment, expands the heat wave range, and improves heavy oil extraction efficiency.

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Abstract

The invention discloses a self-heat-generation viscosity reduction complexing agent for offshore oilfield thickened oil development and a preparation method thereof. The self-heat-generation viscosity reduction complexing agent comprises the following components in percentage by mass: 25-30% of a heat generation agent, 15-25% of an initiator, 0.6-1.2% of a delay catalyst, 0.4-1.0% of a viscosity reduction system and the balance of water. The heat generating agent and the initiator react under the action of the delay catalyst, a large amount of heat can be generated to heat the stratum, and the viscosity of the thickened oil is synergistically reduced by combining the efficiency of the water-soluble viscosity reducer. The reaction is accompanied with generation of carbon dioxide gas when the nitrogen and the initiator are excessive, the viscosity of crude oil is further reduced through gas dissolution, the formation pressure is increased, and thickened oil recovery is facilitated. The device is used for offshore heavy oil self-generated heat exploitation, has the characteristic of delayed reaction, and does not damage a pipe column and underground equipment.
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