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Detection method of polychanneling channel in polymer flooding

A detection method and polymer technology, which is applied in the direction of earth drilling, mining fluid, wellbore/well components, etc., can solve the problems of low judgment accuracy, high cost, and poor utilization effect

Active Publication Date: 2016-04-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] At present, there are many studies on polymer channeling in polymer flooding, and the main methods are static analysis and tracer method. In terms of parameters, it cannot accurately reflect the development and production dynamics of the reservoir, so the judgment accuracy is low, and the actual utilization effect is poor. The tracer method requires special testing, which is expensive and affects production. Detection method

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  • Detection method of polychanneling channel in polymer flooding
  • Detection method of polychanneling channel in polymer flooding
  • Detection method of polychanneling channel in polymer flooding

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with specific examples, but the implementation scope of the present invention is not limited.

[0027] Take the detection method of polymer flooding channels in Gudong Oilfield as an example. The oil-bearing area of ​​the polymer flooding pilot test area is 1.24km 2 , geological reserves 277×10 4 t, the average effective thickness is 12.3m, the average porosity is 29.4%, and the average air permeability is 1320×10 -3 μm 2 . At present, there are 10 injection wells and 16 effective oil wells in this block of the pilot area.

[0028] Gudong Oilfield is a highly heterogeneous oilfield, and there are natural fractures, high-permeability layers and high-permeability channels in the formation. When polymer flooding is used to increase production, the phenomenon of polychanneling is serious and the effect of increasing oil is poor.

[0029] The present invention selects 3 wells in a pilot pilot area o...

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Abstract

The invention discloses a detection method of a polymer flooding and gathering channel, which detects a gathering channel of a polymer flooding oil field through a characteristic curve of oil producing, gathering and increasing oil indexes. The method comprises the steps of collecting oil production and liquid production capacity of an oil well and the concentration data of polymers in output liquid; calculating the output of polymers, i.e. production and gathering amount; obtaining accumulative oil increment, accumulative production and gathering amount producing, gathering and increasing oil indexes; making the characteristic curve of the producing, gathering and increasing oil indexes; detecting the gathering degree and the gathering channel in accordance with the characteristic curve patterns of the producing, gathering and increasing oil indexes. The method is simple to operate and strong in practicality; furthermore, the technical support can be provided to improve the development effect of the polymer flooding and furthermore improve the recovery ratio of polymer flooding oil field.

Description

technical field [0001] The invention relates to a method for detecting polychannels in the development process of polymer flooding oilfields, in particular, it provides a detection method for the degree of polychanneling and polychannels based on the dynamic data of polymer flooding oilfield development, in order to improve the polymerization Provide technical support for improving the development effect of physical flooding and further improving the recovery of polymer flooding oilfields. Background technique [0002] Polymer flooding is an important method to enhance oil recovery in high water-cut oilfields at home and abroad. After the polymer solution is injected into the formation, it can significantly improve the oil-water mobility ratio, reduce viscous fingering, and achieve the purpose of increasing the swept volume and improving the recovery factor. The heterogeneity of the formation, natural fractures, and the dominant channels such as high-permeability channels a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
CPCE21B43/16E21B49/00
Inventor 侯健刘永革高达任晓云杜庆军任伟伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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