Identification of High-Temperature Oxidation Zones in Cored Wells for Development with In-situ Combustion of Heavy Oil Reservoirs

doi:10.3969/j.issn.1006-6535.2022.03.011

Abstract

Abstract: In order to accurately identify the high-temperature oxidation zones in cored wells with in-situ combustion, cores from Cored Well 1-46-K037 in Block Du 66 were used to analyze the group components, saturated hydrocarbons, functional groups and organic elements of crude oil, as well as the carbonate minerals and clay minerals in the reservoir. The study showed that, under the influence of high temperature of in-situ combustion, the contents of saturated hydrocarbons and aromatic hydrocarbons among group components of the crude oil were increased in the high-temperature oxidation zone, while the contents of non-hydrocarbons and asphaltenes were decreased; the main peak carbon in the gas chromatogram of saturated hydrocarbons was decreased, the weight ratio increased, the oxygen content in the infrared spectrum increased, and the H/C atomic ratio in organic elements increased. Due to the thermal decomposition and interconversion of minerals at high temperature, the content of carbonate minerals (dolomite, calcite and siderite) in the reservoir was decreased in the high-temperature oxidation zone, while the content of kaolinite, illite and chlorite in the clay minerals increased and the content of illite-smectite mixture decreased. The high-temperature oxidation zone identified by the characteristic parameters of crude oil should be narrower than the high-temperature oxidation zone identified by the characteristics of the reservoir minerals. The study explores the changing laws of crude oil and reservoir minerals during in-situ combustion, and improved the technical method for identifying high-temperature oxidation zones with cored wells.

Key words: in-situ combustion, heavy oil, high-temperature oxidation zone identification, coring well, reservoir minerals, Block Du 66

CLC Number:

TE357

Liu Qicheng, Yan Hongxing, Yang Junyin, Cheng Haiqing, Dong Xiaodong. Identification of High-Temperature Oxidation Zones in Cored Wells for Development with In-situ Combustion of Heavy Oil Reservoirs[J]. Special Oil & Gas Reservoirs, 2022, 29(3): 76-83.

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