Monitoring and Description Methods of Fire Flooding Combustion Front in Hongqian Area, Karamay Oilfield

doi:10.7657/XJPG20200208

Abstract

Abstract:

The position of combustion front is the focus of fire flooding research, and it is also the guarantee of the correct understanding about fire flooding sweep status. In Hongqian fire flooding pilot test area of Xinjiang, thermometric well method, electromagnetic method and numerical simulation method are used to monitor the position of combustion front, but these methods can’t fully meet the requirement of fast and accurate determination of the combustion front in the oilfield. Based on the laboratory experiment and in-situ test of dry fire flooding, a linear relationship between the acid value of crude oil and advancing distance of combustion front is established, and then the position of combustion front is calculated with the relationship. The synchronous change of the pressures in two adjacent gas injection wells in fire flooding field reflects an important characteristic of the interconnection of the two combustion chambers. Based on the variations of crude oil acid value and pressure, the crude oil acid value-pressure method for combustion front description is established. The combustion front positions at different times are described by using the acid value-pressure method according to the acid value and injection pressure obtained from the Hongqian fire flooding pilot test area in Xinjiang. By the end of 2016, the combustion front in the up-dipping direction had reached the producers, that in the down-dipping direction had gone beyond the producers, and most combustion chambers had been connected. Finally, the results of fire line description are verified by electromagnetic method and thermometric well method. It is concluded that the calculation of the combustion front position with the acid value-pressure method is reliable, which can accurately reflect the advancement of the combustion front.

Key words: Junggar basin, Hongqian fire flooding pilot test area, in-situ combustion, combustion front, crude oil acid value, injection pressure

CLC Number:

T345

GAO Chengguo, null null, ZHAN Hongyang, WANG Yong, YANG Fengxiang, YUAN Shibao. Monitoring and Description Methods of Fire Flooding Combustion Front in Hongqian Area, Karamay Oilfield[J]. Xinjiang Petroleum Geology, 2020, 41(2): 188-192.

Figures/Tables 4

References 17

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