Quantitative assessment method for ASP (alkaline/surfactant/polymer) flooding effect

A ternary composite and evaluation method technology, which is applied in the fields of earthwork drilling, climate change adaptation, special data processing applications, etc., can solve the problems of not conforming to the actual production of oil wells, no comparison of samples, poor comparability, etc.

Inactive Publication Date: 2019-11-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing analysis of the ASP displacement effect mostly relies on core samples or artificial sandstone samples, which do not confo

Method used

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  • Quantitative assessment method for ASP (alkaline/surfactant/polymer) flooding effect
  • Quantitative assessment method for ASP (alkaline/surfactant/polymer) flooding effect
  • Quantitative assessment method for ASP (alkaline/surfactant/polymer) flooding effect

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Example Embodiment

[0024] Example 1:

[0025] A quantitative evaluation method for ASP flooding effect, taking PI33 in the eastern research area of ​​Xingliu District, Changyuan Xingshugang Oilfield, Daqing as an example, the area of ​​the research area is 1.2km 2, the formation dip angle is less than 3°, and no faults are developed. The single sand body has an average thickness of 6.2m and an effective thickness of about 4.5m. It belongs to shallow water delta low-curvature meandering distributary channel deposits. It is distributed in the study area, with an average permeability of 556mD and an average porosity of 28.7%. High-permeability reservoirs in pores. This area is part of the Daqing Changyuan packaged reservoir, which was developed by water flooding in 1968 and lasted for 40 years. At the end of 2008, the average regional water production rate was close to the critical value of the economic water production rate of water flooding, that is, 98%, which belonged to the late stage of ult...

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Abstract

The invention relates to the technical field of oil recovery, and particularly relates to a quantitative assessment method for an ASP (alkaline/surfactant/polymer) flooding effect. Six parameters, namely a water production rate descend range, a chemical flooding continuous effect time, chemical flooding efficiency, an accumulated water-oil ratio, an accumulated oil production quantity and an actual production time proportion, reflecting an oil well production condition are selected; the weight value of each parameter is acquired by a principal component analysis method, and thus a quantitativeassessment computing formation for comprehensively assessing the oil well production condition is determined. Scores of the six single parameters of wells to be assessed are substituted into the computing formula, and then the comprehensive assessment value of each well is acquired. According to the method, quantitative comparison of the production conditions of the different oil wells can be achieved, and a basis is provided for subsequent analysis of production feature differences of the oil wells and proposing of a production measure adjustment scheme.

Description

technical field [0001] The invention relates to the technical field of oil recovery, in particular to a method for quantitatively evaluating the displacement effect of a three-element compound. Background technique [0002] As an important displacement method in tertiary oil recovery, ASP flooding was first reported by the United States in 1977, and was first introduced into China in 1988 by Daqing Oilfield. After years of laboratory tests and field tests, the pilot test areas in some old oil fields with high water cut onshore in my country have been put into production. The components of the three-component composite oil displacement agent include alkali, polymer and surfactant, among which the polymer increases the viscosity of the water phase and reduces the mobility ratio of the water-oil two-phase, which can effectively expand the sweeping range of the chemical agent, and at the same time The lye and surfactant reduce the interfacial tension of oil and water, which is ...

Claims

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Application Information

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IPC IPC(8): E21B43/22G06F17/50
CPCE21B43/16Y02A10/40
Inventor 吕端川林承焰任丽华董春梅宋金鹏狄喜凤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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