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- Title
长岭断陷龙凤山气田致密凝析气藏 CO<sub>2</sub>吞吐效果评价.
- Authors
高云丛; 王建波; 周 杨
- Abstract
Tight condensate gas reservoir in Longfengshan Gas Field in Changling Rift is characterized by rapid decline and low recovery of OOIP. In order to reduce retrograde condensate contamination and development challenge of condensate recovery near wellbore zone, CO2 huff-and-puff effect is analyzed and evaluated by means of numerical simulation and CO2 huff-and-puff experiment to study the method for increasing gas well production and improving gas reservoir recovery. The results show that: CO2 huff-and-puff in tight condensate gas reservoir removes retro‑grade condensate contamination more efficiently than that with dry gas huff-and-puff. Gas well retrograde condensate is divided into 4 stages, including early stage of retrograde condensate (no influence on production), retro‑ grade condensate aggravation (having influence on oil production), serious retrograde condensate (much influence on oil and gas production) and extreme retrograde condensate (nearly no oil production). Gas wells in different stages have different CO2 huff-and-puff mechanisms and purposes, and the design of CO2 huff-and-puff parameters should be optimized accordingly. Field implementation shows that 5 CO2 huff-and-puff wells are in different retro‑grade condensate stages before CO2 huff-and-puff, while the effects of rapid increase of formation energy, retro‑grade condensate contamination removal near wellbore zone, injectivity improvement and production increase of condensate oil and natural gas are obtained after CO2 huff-and-puff. The research results provide experience for largescale application of CO2 huff-and-puff technology in tight condensate gas reservoir.
- Publication
Petroleum Geology & Oilfield Development in Daqing, 2024, Vol 43, Issue 2, p160
- ISSN
1000-3754
- Publication type
Article
- DOI
10.19597/J.ISSN.1000-3754.202304011