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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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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 conform to the actual production of oil wells under real reservoir conditions, and the conclusions obtained are relatively one-sided and different. There is no contrast between samples, or the comparability is poor

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

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Embodiment 1

[0025] A quantitative evaluation method for ASP flooding effect, taking PI33, 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 dip angle of the formation is less than 3°, and no fractures are developed. The average thickness of the single sand body is 6.2m, and the effective thickness is about 4.5m. It belongs to the shallow-water delta low-sinuosity meandering distributary channel deposits. Pores with high permeability reservoirs. This area is part of the Daqing Changyuan monolithic oil reservoir, and water flooding development began in 1968, which 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 ultra-high water cut. The body is medium-low flooded. The recovery rate of crude oil is 47.8%. In order to ...

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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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