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Analysis method for polymer flooding large pore path oil deposit test well

An analysis method and technology of large pore channels, which can be used in earth-moving drilling, wellbore/well components, special data processing applications, etc., and can solve problems such as lack of research on polymer injection reservoirs

Active Publication Date: 2017-12-29
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method they established is only suitable for the identification of large pores in water-injected reservoirs, and has not been studied for polymer-injected reservoirs.

Method used

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  • Analysis method for polymer flooding large pore path oil deposit test well
  • Analysis method for polymer flooding large pore path oil deposit test well
  • Analysis method for polymer flooding large pore path oil deposit test well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0135] The example data is taken from the pressure drop data of a polymer injection well in Bohai B Oilfield. The reservoir has strong heterogeneity, porosity is 0.31, and average permeability is 2000mD. The polymer concentration is 1500mg / L. Since the polymer injection, the production wells have seen rapid polymer production, high polymer concentration, rapid rise in water cut, and decreased polymer injection effect. It is preliminarily concluded that there are large pores in this well group. The polymer injection well underwent a pressure drop test on March 2, 2016.

[0136] Using the polymer flooding large pore reservoir well test analysis method to carry out well test interpretation of a certain polymer injection well in Bohai B Oilfield, in this embodiment, the oilfield measured data and the theoretical chart fitting curve (such as Figure 7 shown), the model explains the parameters of large pores as: β=4.4, K f =8850mD,W f = 3.5m. According to the interpretation resul...

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Abstract

The invention discloses an analysis method for a polymer flooding large pore path oil deposit test well. The method is characterized in comprising the following steps that: 1) according to the characteristics of a polymer flooding large pore path oil deposit, establishing a polymer flooding large pore path oil deposit physical model; 2) according to the polymer flooding large pore path oil deposit physical model obtained in 1), determining a polymer flooding large pore path oil deposit mathematical model; 3) adopting a finite difference method to solve the polymer flooding large pore path oil deposit mathematical model obtained in 2), and obtaining the numerical solution of well bottom pressure; 4) carrying out nondimensionalization on a change relationship of pressure along with time, and drawing the typical curve theory plate of the polymer flooding large pore path oil deposit; and 5) carrying out fitting on the typical curve theory plate of the polymer flooding large pore path oil deposit and an oil field actual measurement data curve, and obtaining the equivalent width and permeability parameter of a large pore path.

Description

technical field [0001] The invention relates to a well testing analysis method for a polymer flooding large pore reservoir, belonging to the technical field of well testing. Background technique [0002] During the long-term water flooding development of offshore sandstone reservoirs, the pore structure of the reservoir has changed greatly. Due to the increase of reservoir permeability and pore throat radius, it is easy to form high-permeability bands and ultra-high pressure in the reservoir. Permeable strips, i.e. macropores. The existence of large pores intensifies the contradiction between layers. The polymer injected by means of enhanced oil recovery in the later period will circulate inefficiently or ineffectively along the large pores, which makes it difficult for other parts of the reservoir to be effective, seriously affecting the oil displacement efficiency, resulting in flat The difference in remaining oil saturation is obvious, and the development effect of polym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50E21B43/22E21B49/00
CPCE21B43/16E21B49/00G06F30/20Y02A10/40
Inventor 康晓东张健曾杨唐恩高谢晓庆石爻
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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