A State of the Art Review on the Wellbore Blockage of Condensate Gas Wells: Towards Understanding the Blockage Type, Mechanism, and Treatment

Abstract

With the development of high-pressure and high-temperature condensate gas wells, the wellbore blockage problems have become increasingly serious. Hence, selecting appropriate treatment technology plays a crucial role in solving the wellbore blockage problems. This study presents a comprehensive literature review on understanding the blockage type, mechanism, and treatment of the high-temperature and high-pressure condensate gas wells. The causes, endangerments, mechanisms, influences, and preventive technologies of the 4 wellbore blockage types are presented. The significant aspects of the treatment technology, such as the principle, type, advantage and disadvantage, adaptability, limitation, and future research direction of the treatment technologies, are thoroughly discussed. The breakthrough solid autogenetic heat treatment technology has been selected to remove hydrate blockage. The present review highlights the current state in the industry, future position, and strategies for the researchers to follow. Finally, the advantages and disadvantages and future research directions of specific treatment technology are presented on the removing effect, cost, and environmental aspects.

Mechanism of Salt Precipitation Blockage in Low-Producing Gas Wells and the Method of Acidification Blockage Removal

“…These blockages can be broadly categorized into organic and inorganic types. Organic blockages encompass substances like wax, asphaltene, residues from the manual addition of reagents such as corrosion inhibitors and oil-displacing agents, as well as hydrates formed during production due to low temperature and high pressure, occasionally leading to composite blockages . In contrast, the formation of inorganic blockages is mainly attributed to factors such as high salinity or corrosion in the formation water, involving substances like NaCl, CaCO 3 , CaSO 4 , BaSO 4 , and FeS. , To identify the root cause of these blockages, it is essential to take samples from field wells, separate them, and then conduct comprehensive analysis and identification.…”

Experimental and Statistical Study on Wellbore Scaling Mechanisms and Characteristics for Huanjiang Oilfield

“…Vazquez et al [21] compared the nonaqueous and aqueous overflush scale inhibitor squeeze treatment to mitigate barium sulphate scale by building a reservoir simulation model based on a Norway offshore oilfield [21]. Shi et al [22] present a comprehensive literature review for wellbore scale types, mechanisms, and treatments [22].…”