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

A technology for channeling polymerization and polymer, which is applied in the field of optimized production allocation and injection in oilfields, and can solve problems such as increasing polymer output.

Active Publication Date: 2016-06-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Embodiment

[0023] A screening method for poor polymer injection wells and polymer channeling wells, comprising the following steps:

[0024] (1) Collect the oil production data and polymer production data of each production well in the polymer flooding block, and calculate the cumulative oil increase and cumulative polymer production of each production well at the screening time; the polymer flooding block is Refers to a development unit with an independent injection-production system that implements polymer flooding in an oilfield;

[0025] (2) Calculate the ratio of the accumulative oil increment and the accumulative polymer production of a single well to obtain the polymer injection effectiveness coefficient of a single well; the single well refers to a single production well in the polymer flooding block;

[0026] (3) Establish a coordinate system: take the effective coefficient of polymer injection in a single well as the ordinate, and the cumulative polymer production in a single w...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 侯健杜庆军吴金涛李善鹏刘永革夏志增
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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