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- Title
川西中浅层气井速度管柱排采工艺经济评价.
- Authors
王浩儒; 符东宇
- Abstract
Water breakthrough has significant impact on stable gas production of gas wells. This phenomenon is common in mid zone and shallow gas wells in Western Sichuan Province gas field. Installation of velocity string was introduced in 2012 to improve liquid loading of these gas wells, to increase gas production. Most of the wells have stable liquid loading after installation of velocity string, effectively mitigating the gas production decline. However, there are still some wells that do not benefit much from velocity string installation, resulting in poor economic return of the investment. This paper presents the economic evaluation of velocity string installation based on the statistics of various cost items, and assess the cost and economics of velocity string installation in gas wells under different stages of gas production decline. The results show that velocity string installation has economics advantage in most gas wells producing from mid and shallow reservoir zones. However, the effectiveness of velocity string is dependent on intervention timing. It is found that velocity string is most effective if installed before the gas production of the well falls below 10 000 m1/day. Sensitivity analysis was also carried out on factors including natural gas price fluctuation. This economic analysis provides sound basis for decision making on investment in velocity string for middle-shallow gas wells in Western Sichuan province gas field.
- Publication
Natural Gas & Oil, 2020, Vol 38, Issue 5, p144
- ISSN
1006-5539
- Publication type
Article
- DOI
10.3969/j.issn.1006-5539.2020.05.023