Method for judging combustion state of in-situ combustion

Abstract

The invention provides a method for judging the combustion state of in-situ combustion. The method comprises the following steps: step 1, preparing a solution containing polytetrafluoroethylene particles; 2, pumping the solution containing the polytetrafluoroethylene particles into a combustion zone of an oil layer for decomposition and combustion; and step 3, sampling the tail gas of the fireflooding effective well, detecting the content of carbon tetrafluoride through a carbon tetrafluoride gas detector, and when the tail gas of the fireflooding effective well contains the carbon tetrafluoride, judging that the oil layer is in a high-temperature oxidation combustion state. The method has the beneficial effects that whether the injected polytetrafluoroethylene particles are decomposed at high temperature or not is judged by detecting whether the fireflooding tail gas contains carbon tetrafluoride or not, so that whether an oil layer is in a high-temperature oxidation combustion state or not is determined, the fireflooding combustion state can be judged more accurately, a basis is provided for fireflooding regulation, development and adjustment, and the method is worthy of popularization and application. And the improvement of the fireflooding effect is guaranteed.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for judging the combustion state of a fire oil layer. Background technique [0002] At present, the method of judging the combustion state of the incineration oil layer is mainly to judge whether the oil layer is burning at high temperature by sampling the tail gas produced by the effective well of fire flooding, and using gas chromatography to detect the carbon dioxide and oxygen content in the tail gas. This method has universal applicability, but it cannot accurately judge the combustion state of the oil layer. Taking the high ignition flooding in the southern part of Gao3 Block of Gaosheng Oilfield as an example, the carbon dioxide and oxygen content in the tail gas of the fire flooding effective wells are all in line with the high temperature combustion characteristics, but the oil well production and production The outlet temperature did not increase...

AI Technical Summary

Problems solved by technology

This method has universal applicability, but it cannot accurately judge the combustion state of the oil layer. Taking the high ignition flooding in the southern part of Gao3 Block of Gaosheng Oilfield as an example, the carbon dioxide and oxygen content in the tail gas of the fire flooding effective wells are all in line with the high temperature combustion characteristics, but the oil well production and production The fluid temperature did not increase significantly, the temperature measurement of the oil layer was still in the original ground temperature state, and the production of some wells did not increase but decreased

Long-term low-temperature oxidation of oil layers will lead to increased oil viscosity, poor fluidity, polluted oil layers, and reduced oil well production

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