Method for optimizing injection amount of natural gas for viscosity reduction and lifting in heavy oil mixed with thin oil well

By optimizing the gas injection rate in heavy oil blending wells, the problems of uneven mixing of heavy and light oils and insufficient light oil resources were solved, achieving efficient flow and economical production of heavy oil and meeting the requirements of surface gathering and transportation.

CN117948108BActive Publication Date: 2026-07-07CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2022-10-29
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

During the extraction of heavy oil, uneven mixing of heavy oil and light oil results in an insignificant reduction in the viscosity of the mixture. Furthermore, the large amount of light oil used leads to poor economic benefits. Insufficient light oil resources and excessive or insufficient gas injection volume both affect the production of heavy oil and the efficiency of surface gathering and transportation.

Method used

By gradually reducing the dilution ratio, based on the minimum gas injection rate for continuous wellbore flow startup, the wellhead oil production pressure and viscosity are calculated to determine whether the surface gathering and transportation conditions are met, the optimal gas injection rate is determined, and the gas injection rate of heavy oil dilution wells is optimized.

Benefits of technology

While reducing the amount of light oil used, the goal is to ensure that the crude oil produced at the wellhead meets the requirements for surface gathering and transportation, improve the fluidity and production of heavy oil, optimize the utilization rate of light oil, and enhance economic benefits.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a method for optimizing injection gas amount of natural gas injection for reducing viscosity of thickened oil mixed with thin oil, and belongs to the technical field of oil production engineering. The method comprises the following steps: gradually reducing the mixing ratio of thin oil, calculating wellhead oil production pressure P0 and wellhead viscosity mu0 based on the minimum injection gas amount for starting continuous flow of the wellbore; judging whether the wellhead crude oil meets the ground gathering condition based on the wellhead oil production pressure P0 and the wellhead viscosity mu0; and determining the optimal injection gas amount based on the judgment result. The method can reduce the amount of thickened oil mixed with thin oil as much as possible while ensuring that the wellhead produced crude oil meets the ground gathering requirement, and can provide a basis for calculating the optimal injection gas amount for reducing the amount of thickened oil mixed with thin oil on site.
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