Method for inverting carbon dioxide flooding frontal edge by multi-point continuous pressure measurement data

Abstract

The invention provides a method for inverting a carbon dioxide flooding frontal edge by multi-point continuous pressure measurement data. The method for inverting the carbon dioxide flooding frontal edge by the multi-point continuous pressure measurement data comprises the steps that 1, the actually measured continuous bottom-hole flowing pressure of a gas injection well and an oil production well are determined, and an actual measured continuous injection-production pressure difference is calculated according to the actually measured continuous bottom-hole flowing pressure of the gas injection well and the oil production well; 2, the theoretical continuous bottom-hole flowing pressure of the gas injection well and the oil production well are calculated, and a theoretical continuous injection-production pressure difference is calculated according to the theoretical continuous bottom-hole flowing pressure of the gas injection well and the oil production well; and 3, a carbon dioxide additional pressure drop is calculated according to the actually measured and the theoretical continuous injection-production pressure difference, and the equivalent wave and the radius of carbon dioxide are inverted. The method for inverting the carbon dioxide flooding frontal edge by the multi-point continuous pressure measurement data is accurate in result and easy to implement, and has significant meaning on improving the exploitation effect of carbon dioxide flooding and achieving scientific management of carbon dioxide flooding reservoirs.

Description

technical field [0001] The invention relates to the field of evaluation of carbon dioxide flooding fronts in oil and gas field development, in particular to a method for inverting carbon dioxide flooding fronts by using multi-point continuous pressure measurement data. Background technique [0002] Carbon dioxide flooding shows unique advantages in solving low permeability reservoir development. During the field test, it is reflected that carbon dioxide flooding has strong gas channeling characteristics, and the potential tapping effect varies greatly, and it is difficult to quantify it purely from the perspective of carbon dioxide output. Therefore, it is necessary to accurately describe the distribution of subsurface carbon dioxide displacement fronts from the perspective of field measurements. The commonly used methods include numerical simulation technology, cross-well microseismic method and cross-well tracer test method. However, the numerical simulation technology r...

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Problems solved by technology

However, the numerical simulation technology requires high data and long simulation period; the cross-well microseismic method and the cross-well tracer test method are costly, and it is difficult to describe the change of the carbon dioxide front in the early stage of gas channeling, and it is impossible to obtain the continuity of the carbon dioxide displacement front. Changes

[0003] Due to the inability to accurately and timely describe the continuous changes of the carbon dioxide displacement front, the current carbon dioxide flooding development of low-permeability reservoirs has serious gas channeling, poor development effects, lack of basis for timely adjustment of the working system, and lagging development management

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