Investigation of natural gas flooding and its channelling prevention as enhanced oil recovery method

IF 1.5 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Geosystem Engineering Pub Date : 2021-03-03 DOI:10.1080/12269328.2021.1878938

Dong Lifei, Wang Miao, Wang Wei, Lin Hun

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引用次数: 5

Abstract

ABSTRACT The natural gas can improve the flooding effect as its excellent flow property and dissolution ability, but it is also easily to form the serious gas channelling when injecting gas continuously. In order to decribe the advantages and disadvantages of natural gas flooding, the oil dispalcement experiments of injecting natural gas after water flooding with different permeability cores are done. The natural gas channelling and its prevention manner are discussed by theoretical and experimental analysis, and the water alternating natural gas (WAG) injection is introduced. The results show that the natural gas flooding can enhance oil recovery after water flooding in different permeability reservoirs, especially in lower permeability reservoirs. The continuously natural gas flooding can easily form and develop the gas channeling. It takes only 0.13 PV to 0.45 PV natural gas injection to form the gas channelling, and spends 0.5 PV to 1.5 PV injection to develop the gas channelling for making the gas-liquid ratio reaching to 200 in the cores with the permeability from 6.876 × 10−3μm2 to 540.124 × 10−3μm2 . The WAG injection with the WAG cycle below 2 can prevent the natural gas channelling and keep the good natural gas utilisation in low/ultra-low permeability reservoirs.

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天然气驱及其防窜作为提高采收率方法的研究

天然气具有优良的流动特性和溶解能力，可以提高驱油效果，但连续注气也容易形成严重的气窜。为了描述天然气驱油的优缺点，进行了不同渗透率岩心水驱后注天然气驱油实验。通过理论分析和实验分析，探讨了天然气窜气及其防治方法，并介绍了水交替天然气注气技术。结果表明，在不同渗透率的储层，特别是低渗透储层，水驱后天然气驱能提高采收率。天然气连续驱油容易形成和发展气窜。在渗透率为6.876 × 10−3μm2 ~ 540.124 × 10−3μm2的岩心中，只需注入0.13 ~ 0.45 PV天然气即可形成气通道，注入0.5 ~ 1.5 PV天然气即可形成气通道，使气液比达到200。在低/特低渗透储层中，注入周期小于2的WAG可以防止天然气窜气，保持良好的天然气利用率。

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来源期刊

Geosystem Engineering GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

2.70

自引率

0.00%

发文量