A Screening Method for Poor Polymer Injection Wells and Polymer Channeling Wells

Abstract

The invention discloses a screening method of a polymer injection inferior efficiency well and a polymer gather well. The screening method of the polymer injection inferior efficiency well and the polymer gather well comprises the following steps that the cumulative oil increasing amount and the cumulative polymer producing amount of each producing well at the screen moment are calculated; a single well polymer injection effective coefficient is obtained; a coordinate system is established; the single well polymer injection effective coefficient is taken as a vertical ordinate, a single well cumulative polymer producing amount is taken as a horizontal ordinate, and a scatter diagram of the relation between the single well polymer injection effective coefficient and the single well cumulative polymer producing amount is drawn; a polymer injection superior efficiency well area and a polymer injection inferior efficiency well area are partitioned by using a mean value method; the polymer gather well area is partitioned from the polymer injection inferior efficiency well area through a K-mean value clustering algorithm; the screening method of the polymer injection inferior efficiency well and the polymer gather well uses an area where an oilfield production well located in the scatter diagram of the relation between the single well polymer injection effective coefficient and the single well cumulative polymer producing amount to screen out the polymer injection inferior efficiency well and the polymer gather well. The single well polymer injection effective coefficient and the single well cumulative polymer producing amount are taken as indexes to establish the screening method of the polymer injection inferior efficiency well and the polymer gather well, and decision instructions are provided for the optimizing of measures of oil field profile control water plugging and production allocation and injection allocation.

Description

technical field [0001] The invention relates to a screening method for poor polymer injection wells and polymer channeling wells, and belongs to the technical field of optimizing production allocation and injection in oil fields. Background technique [0002] Polymer flooding is a flooding method that reduces the water-oil mobility ratio, expands the swept volume, and improves oil recovery by injecting a high-viscosity polymer solution into the oil reservoir. In the process of oilfield polymer flooding development, the existence of poor polymer injection wells and polymer channeling wells will lead to a decrease in polymer utilization efficiency, a substantial increase in polymer consumption per ton of oil, resulting in serious polymer waste and poor oilfield development results. Among them, poor polymer injection wells refer to oil wells that do not see obvious oil increase effect after polymer injection, and polymer channeling wells refer to oil wells with large polymer ou...

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Problems solved by technology

The field simply relies on the cumulative oil increment of a single well to evaluate the polymer injection effect of a single well, but a high cumulative oil increment of a single well may also mean an increase in polymer output, so this approach is very blind sex

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