Method for determining fireflooding combustion temperature of heavy oil reservoir by utilizing iron-containing minerals

Abstract

The invention provides a method for determining the fireflooding combustion temperature of a heavy oil reservoir by using iron-containing minerals. The method comprises the following steps of carryingout a calcination test on a core in a target research area under different temperature conditions, and carrying out whole-rock quantitative analysis on the core after the core is cooled to obtain thesiderite content in the core under different calcination temperature conditions and the relationship between the siderite content and the temperature; carrying out heavy mineral analysis on the cooled rock core so as to determine the content of iron-containing minerals in the heavy minerals under different calcination temperature conditions and the relationship between the iron-containing minerals and the temperature; carrying out trace element analysis on the cooled rock core so as to determine the contents of total iron, Fe<2+> and Fe<3+> in the iron-containing minerals under different calcination temperature conditions and the relationship between the contents and the temperature; analyzing the change rule of the color of the cooled rock core, and establishing a rock core color code plate; and determining the fireflooding combustion temperature of the heavy oil reservoir according to the relationship between the siderite content, the iron-containing mineral content, the total ironcontent, the Fe<2+> content and the Fe<3+> content in the rock core and the temperature and one or more of the rock core color code plates.

Description

technical field

[0001] The invention relates to a method for determining the fire flooding combustion temperature of heavy oil reservoirs by using iron-containing minerals, and belongs to the technical field of petroleum development. Background technique

[0002] Fire flooding is a thermal oil recovery method that generates heat inside the oil layer to cause high-temperature oxidation reaction between crude oil and injected air or oxygen, releases a large amount of heat and gas, and displaces unburned crude oil to production wells. This method has no heat loss along the wellbore, and has the advantages of high recovery, low cost and wide application range, and can be used as an effective replacement technology after steam huff and puff in heavy oil reservoirs. During the fire flooding process, determining the underground combustion temperature is helpful to understand the fire flooding combustion state (high-temperature combustion or low-temperature combustion), and timely a...

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