Medium-low permeability reservoir oxygen reduction air drive feasibility analysis method
An analysis method and air flooding technology, applied in the field of oil field exploration, can solve problems such as prone to channeling, and achieve the effect of improving the degree of recovery
Active Publication Date: 2020-02-28
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
At the same time, compared with water flooding, gas flooding is more prone to channeling due to lower fluid mobility. How to judge gas channeling and how to evaluate the risk of gas channeling are issues that must be considered in the development of gas drive schemes
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[0019] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.
[0020] The present invention provides a method for analyzing the feasibility of oxygen-reduced air flooding in medium and low permeability reservoirs, comprising the following steps:
[0021] 1) Based on the historical data of the development of oxygen-reduced air flooding in medium and low permeability reservoirs, evaluate the development effect of oxygen-reduced air flooding in medium and low permeability reservoirs, and obtain the development effects of oxygen-reduced air flooding in medium and low permeability reservoirs the results of the assessment;
[0022] 2) According to the evaluation results of the development effect of oxygen-reduced air flooding in medium and low permeability reservoirs, the factors affecting the development effect of oxyg...
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The invention provides a medium-low permeability reservoir oxygen reduction air drive feasibility analysis method which comprises the following steps: 1) evaluating the development effect of medium-low permeability reservoir oxygen reduction air drive to obtain an evaluation result; 2) analyzing influence factors of the oxygen reduction air flooding development effect of the medium-low permeability reservoir by adopting a difference confidence method to obtain initial key influence factors; 3) verifying the initial key influence factors through a correlation analysis method in a grey theory toobtain final key influence factors; 4) establishing a z function suitable for feasibility analysis of oxygen reduction air displacement of the medium-low permeability reservoir to obtain a preliminary feasibility analysis and evaluation result of oxygen reduction air displacement of the medium-low permeability reservoir; and 5) evaluating the gas channeling risk of the oxygen reduction air driveof the medium-low permeability reservoir, and obtaining a final feasibility analysis result according to the gas channeling risk evaluation result and the preliminary feasibility analysis evaluation result. The method can be widely applied to the field of feasibility analysis of the oxygen reduction air drive of the medium-low permeability reservoir.
Description
technical field [0001] The invention relates to the technical field of oilfield exploration, in particular to a method for analyzing the feasibility of oxygen-reduced air flooding in medium and low permeability reservoirs. Background technique [0002] As a new type of displacement medium, oxygen-reduced air flooding mainly solves the problems of difficult water injection and low water injection efficiency in low permeability reservoirs. For offshore medium and low permeability oil fields, oxygen-reduced air flooding has stronger injection capacity than water flooding, and can establish an effective pressure displacement system in medium and low permeability oil fields. Compared with other air sources, oxygen-reduced air is easier to obtain and has higher safety, so it has high promotion value. [0003] However, the feasibility of oxygen-reduced air flooding for medium and low permeability reservoirs is not clear at present. The feasibility of oxygen-reduced air flooding fo...
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IPC IPC(8): G06F30/20G06F17/15G06F17/18G06Q10/06G06Q50/02E21B43/22G06F111/10
CPCG06F17/18G06F17/15G06Q10/0635G06Q50/02E21B43/168Y02A10/40
Inventor 李南谭先红田虓丰朱国金张利军彭世强王帅郑伟王泰超王杰祥王腾飞褚国宇
Owner CHINA NAT OFFSHORE OIL CORP