Working Paper Article Version 1 This version is not peer-reviewed

The Experimental Studies on the EOR Laws of Air Injection Displacement in the Low Permeable Oil Reservoirs

Version 1 : Received: 1 February 2020 / Approved: 3 February 2020 / Online: 3 February 2020 (04:57:42 CET)

How to cite: Luan, J.; Dong, P.; Zheng, J. The Experimental Studies on the EOR Laws of Air Injection Displacement in the Low Permeable Oil Reservoirs. Preprints 2020, 2020020012 Luan, J.; Dong, P.; Zheng, J. The Experimental Studies on the EOR Laws of Air Injection Displacement in the Low Permeable Oil Reservoirs. Preprints 2020, 2020020012

Abstract

The Oil reservoirs with low permeability account for a large proportion in the world, they surpass half of the total number of the oil reservoirs in China, it is important to exploit this kind of reservoir effectively. The exploitive results of these reservoir using normal water flooding methods are very poor because of the thine pores, bad connections and so on. However, these problems can be well solved by applying gas injection techniques. In this paper, the effects on the recovery effects exerted by the injection parameters such as the oxygen content in the injected air, the injection speed etc. were studied by several experiments using independently designed equipments aiming at one low permeable sandstone reservoir in China. Several conclusions were made from the experiment results: the best recovery effects can be achieved by injecting the oxygen reduced air with 8% of oxygen at the speed of 0.3ml/min (7.41×10-4PV/min) using the methods of injecting the air slugs and the foaming agent slugs alternately; the best oxidation time of the oil was 168 hours and the final oil recovery could be enhanced by 26.5% in this method. It was also showed by the experiments that the larger the permeability ratio is, the larger the recovery factor will be increased. At last, several equations about relationships between the EOR and the air injection parameters were revealed according to the results of the experiments which may offer some references to the LTO process mechanisms study in the similar oil reservoir.

Subject Areas

low permeable oil reservoir; air injection; EOR; dynamic experiments; formulae

Comments (8)

Comment 1
Received: 13 February 2020
Commenter: Qi Lee
The commenter has declared there is no conflict of interests.
Comment: The results and conclusions are innovative and very helpful to the productin and studies. Some formulae can guide the plan of the oil field exploitation.
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Comment 2
Received: 14 February 2020
Commenter: John Adamn
The commenter has declared there is no conflict of interests.
Comment: Firstly,this paper revels some relations between the EOR results and some parameters of the oil field oprational parameters, which can guide some production oprations in the oil field. Secondly, the experiments cover some hot topic of this technique and make the studies reliable. Last but not least, this article can offer some reference to some studies relate to this technique when they are about to carried out in the future.
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Comment 3
Received: 20 February 2020
Commenter: Vladimir Klaassen
The commenter has declared there is no conflict of interests.
Comment: This paper conduct a very interesting research about petroleum, Injecting air into the ground maybe is a good way to produce oil, In the oil field, many engineers are troubled by how to predict the performance of the gas injection methods, This paper bring out a reference for some engineers. Generally speaking, the formulae in thia article seems can make an accurate description of the air injection EOR effects compared to some simple equations and some experiments in this paper seem very useful. Hope to see it in the journal.
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Comment 4
Received: 21 February 2020
Commenter: Adam Williams
The commenter has declared there is no conflict of interests.
Comment: A relative inovative research. The conclusions of hte article maybe helpful to the petroleum industry in the future, Overall, it is interesting.
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Comment 5
Received: 22 February 2020
Commenter: Vladimir Klaassen
The commenter has declared there is no conflict of interests.
Comment: A research about injecting air into the oil formation. This technique is quite broadly used in China and some reservoirs, especially in some place that can't use water injection method. This article gives some new idea about evaluating the posiibility of applying the air injection technique, Some formulae in this article are newly brought out, maybe they can provide some references to the relative researches.
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Comment 6
Received: 24 February 2020
Commenter: Johson Dan Wong
The commenter has declared there is no conflict of interests.
Comment: An interesting research that reveal the relation between the result of the activities in the oil field. My interests are also in this field, I hope these researches conslusions can be widened to guide the research and production activities in my country.
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Comment 7
Received: 26 February 2020
Commenter: Tiffin T.H.
The commenter has declared there is no conflict of interests.
Comment: An article reveal some relations about the recovery factor and the factors of injecting air into the reservoir. In can be seen that the experiments are explicit and the ideas are interesting.
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Comment 8
Received: 29 February 2020
Commenter: John Batenburg
The commenter has declared there is no conflict of interests.
Comment: The authors conduct several experiments and make some conclusions anout the studies of injecting air into the reservoir. It can be seen from the article that they want to make some predictions about the production performances. According to their conclusions, some engineers and executives can make their decisions about when, where and how to operate the injection options. I think the article is valuable in theair injection aspects.
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