Gas Injection Gravity Miscible Displacement Development of Fractured-Vuggy Volatile Oil Reservoir in the Fuman Area of the Tarim Basin

Xingliang Deng, Wei Zhou (), Zhiliang Liu, Yao Ding, Chao Zhang and Liming Lian
Additional contact information
Xingliang Deng: Tarim Oilfield Company, PetroChina, Korla 841000, China
Wei Zhou: PetroChina Research Institute of Petroleum Exploration &Development, China National Petroleum Corporation, Beijing 100086, China
Zhiliang Liu: Tarim Oilfield Company, PetroChina, Korla 841000, China
Yao Ding: Tarim Oilfield Company, PetroChina, Korla 841000, China
Chao Zhang: Tarim Oilfield Company, PetroChina, Korla 841000, China
Liming Lian: PetroChina Research Institute of Petroleum Exploration &Development, China National Petroleum Corporation, Beijing 100086, China

Energies, 2025, vol. 18, issue 19, 1-16

Abstract: This study investigates gas injection gravity miscible flooding to enhance oil recovery in fractured-vuggy volatile oil reservoirs of the Fuman area, Tarim Basin. The Fuman 210 reservoir, containing light oil with high maturity, large column heights, and strong fracture control, provides favorable conditions for gravity-driven flooding. Laboratory tests show that natural gas and CO 2 achieve miscibility, while N 2 reaches near-miscibility. Mixed gas injection, especially at a natural gas to nitrogen ratio of 1:4, effectively lowers minimum miscibility pressure and enhances displacement efficiency. Full-diameter core experiments confirm that miscibility improves oil washing and expands the sweep volume. Based on these results, a stepped three-dimensional well network was designed, integrating shallow injection with deep production. Optimal parameters were determined: injection rates of 50,000–100,000 m 3 /day per well and stage-specific injection–production ratios (1.2–1.5 early, 1.0–1.2 middle, 0.8–1.0 late). Field pilots validated the method, maintaining stable production for seven years and achieving a recovery factor of 30.03%. By contrast, conventional development relies on depletion and limited water flooding, and dry gas injection yields only 12.6%. Thus, the proposed approach improves recovery by 17.4 percentage points. The novelty of this work lies in establishing the feasibility of mixed nitrogen–natural gas miscible flooding for ultra-deep fault-controlled carbonate reservoirs and introducing an innovative stepped well network model. These findings provide new technical guidance for large-scale application in similar reservoirs.

Keywords: Tarim Basin; Fuman Oilfield; gas injection; gravity miscible flooding; volatile reservoir (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/18/19/5317/pdf (application/pdf)
https://www.mdpi.com/1996-1073/18/19/5317/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:18:y:2025:i:19:p:5317-:d:1767262

Access Statistics for this article

Energies is currently edited by Ms. Cassie Shen

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().