scholarly journals A Study of Compositions Relevant to Selective Water Isolation in Gas Wells

2021 ◽  
Author(s):  
Sudad H Al-Obaidi ◽  
Hofmann M ◽  
Smirnov VI ◽  
Khalaf FH ◽  
Hiba H Alwan

A hydrophobic composition containing water repellents and highly volatile solvents is shown in this study to isolate water from the bottom hole formation zone of gas wells and reduce as much as possible the saturation of pore spaces with water. During injection, this composition shows selectivity and mostly penetrates water-saturated porous media. The study shows that the injection of such composition into porous media has a high water-insulating effect, reducing the water permeability of water-saturated porous media by 35 times with a degree of water isolation of 97%.Moreover, while injecting, it has selective action, mainly penetrating water-saturated media rather than gas saturated media. As a result of injecting 0.91 to 0.99 pore volumes (pv) of the composition, the Qwater/Qgas ratio reaches 5.22 to 5.26, indicating high selectivity.

2021 ◽  
Vol 30 (6) ◽  
pp. 551-565
Author(s):  
S.H. AL-Obaidi ◽  
◽  
Miel Hofmann ◽  
V.I. Smirnov ◽  
F. H. Khalaf ◽  
...  

A hydrophobic composition containing water repellents and highly volatile solvents is shown in this study to isolate water from the bottomhole formation zone of gas wells and reduce as much as possible the saturation of pore spaces with water. During injection, this composition shows selectivity and mostly penetrates water-saturated porous media. The study shows that the injection of such composition into porous media has a high water-insulating effect, reducing the water permeability of water-saturated porous media by 35 times with a degree of water isolation of 97%. Moreover, while injecting, it has selective action, mainly penetrating water-saturated media rather than gas-saturated media. As a result of injecting 0.91 to 0.99 pore volumes (pv) of the composition, the Qwater/Qgas ratio reaches 5.22 to 5.26, indicating high selectivity.


2021 ◽  
pp. 126910
Author(s):  
Jinni Yao ◽  
Hainan Wang ◽  
Chengxue Ma ◽  
Yu Cao ◽  
Wanpeng Chen ◽  
...  

2020 ◽  
Vol 17 (34) ◽  
pp. 769-781 ◽  
Author(s):  
Karina Shamilevna KHAIBULLINA ◽  
Grigory Yurievich KOROBOV ◽  
Aleksandr Viktorovich LEKOMTSEV

The problem of the formation of asphalt-resin-paraffin deposits (ARPD) in oil fields within the “well – bottom-hole formation zone” system is still relevant. To prevent the formation of ARPD in the “bottom-hole formation zone – well” system, the ARPD inhibitors must have high adsorption and low desorption properties concerning the rock. The composition of inhibitors often includes surfactants. Nonionic surfactants, namely, polyesters, are widely used to prevent the formation of ARPD. However, currently, little is known about inhibitors with a combined effect, for example, possessing depressor-dispersing properties for ARPD. This work aimed to develop a combined inhibitor possessing not only depressor-dispersing properties but also having good adsorption and desorption properties to the rock to prevent the formation of ARPD. The paper presents the research results on the development of an ARPD inhibitor, as well as the effects of determination of its depressor dispersing, inhibiting, and corrosive properties; the temperature of oil saturation with paraffin is determined as well. The studies of the ARPD inhibitor adsorption were carried out by the static and dynamic methods. In contrast, the process of the inhibitor desorption was studied by oil filtering through a saturated sample of the rock using a bulk model and core material. The impact of the fluid flow rate on the inhibitor desorption rate was studied. The technological parameters of the ARPD inhibitor solution injection into the bottom-hole formation zone of production wells were calculated. The developed composition has high inhibiting properties concerning the ARPD, depressor dispersing properties, low corrosive activity for a metal surface, and is capable of lowering the temperature of oil saturation with paraffin.


2019 ◽  
Vol 20 (2) ◽  
pp. 911-920 ◽  
Author(s):  
Mo Zhang ◽  
Duo Li ◽  
Zhi Ye ◽  
Shiqi Wang ◽  
Nan Xu ◽  
...  

Chemosphere ◽  
2019 ◽  
Vol 231 ◽  
pp. 405-414 ◽  
Author(s):  
Junwei Yang ◽  
Mengtuan Ge ◽  
Qiang Jin ◽  
Zongyuan Chen ◽  
Zhijun Guo

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