Layered water injection effect analysis method

Abstract

The invention provides a layered water injection effect analysis method. The layered water injection effect analysis method includes the steps that data of a production well, an injection well and an oil deposit are obtained, and dynamic parameters and static parameters of the wells and the oil deposit are determined; the shooting oil layer longitudinal mobilization degree and the water injection strength of the water injection well are generated according to water absorption profile testing data in the dynamic parameters; a Lorentz curve model for describing the relationship between the accumulated shooting sandstone thickness and the accumulated water absorption amount is built according to the water absorption profile testing data and the water injection strength; the oil layer water absorption balance degree is calculated according to the Lorentz curve model so as to achieve layered water injection effect analysis. By means of the layered water injection effect analysis method, the proportion of the longitudinal mobilization sandstone thickness of the water injection well to the total shooting sandstone thickness and the water absorption balance condition of the shooting small-layer whole can be evaluated in a quantified mode; factors having influences on layered water injection are found in cooperation with the over-the-year actual measurement water injection profile, the stratum physical property, the sedimentary phase, the layered water injection tubular column structure and injection allocation data.

Description

technical field [0001] The invention relates to a layered water injection technology for oil and gas fields, in particular to a layered water injection effect analysis method. Background technique [0002] The fine layered water injection technology is gradually becoming one of the main water flooding measures to tap the potential of multi-layer reservoirs in the high water cut stage. Taking Daqing Oilfield as an example, the number of longitudinal sections of water wells is generally adjusted to 4 or more sections, and the real-time monitoring and control system for layered water injection is more advanced. It is difficult to accurately evaluate problems such as complex production relations and various changes in water absorption, which will make it impossible to adjust the nozzle according to the change of water injection pass rate to ensure the dynamic pass rate of layered water injection, and it is impossible to judge which wells should be further subdivided into layers ...

AI Technical Summary

Problems solved by technology

The main problems of the above-mentioned evaluation methods include: ① The existing single-well separate injection evaluation method cannot accurately compare the effects of the same water well before and after the segmental adjustment and different water wells.

②The corresponding relationship between oil and water wells in high water-cut oilfields developed by water flooding at the present stage is complex, and there are various production stimulation measures. It is very difficult to judge the separate injection effect of specific water wells by the oil increment of oil wells

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