Study on Vertical Differential Velocity and Transverse Scope of Nitrogen Injection in Carbonate Reservoirs with Fractures and Vugs in the Tahe Oilfield

LIU Zhongyun; ZHAO Haiyang; WANG Jianhai; DING Baodong

doi:10.11911/syztjs.2019092

Volume 47 Issue 4

Aug. 2019

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Petroleum Drilling Techniques > 2019 > 47(4): 75-82. > DOI: 10.11911/syztjs.2019092

LIU Zhongyun, ZHAO Haiyang, WANG Jianhai, DING Baodong. Study on Vertical Differential Velocity and Transverse Scope of Nitrogen Injection in Carbonate Reservoirs with Fractures and Vugs in the Tahe Oilfield[J]. Petroleum Drilling Techniques, 2019, 47(4): 75-82. DOI: 10.11911/syztjs.2019092

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Study on Vertical Differential Velocity and Transverse Scope of Nitrogen Injection in Carbonate Reservoirs with Fractures and Vugs in the Tahe Oilfield

LIU Zhongyun^1,,
ZHAO Haiyang^{2, 3},
WANG Jianhai^{2, 3},
DING Baodong^{2, 3}

1.
China Petrochemical Corporation, Beijing, 100728, China
2.
Petroleum Engineering Technology Research Institute, Sinopec Northwest Oilfield Branch, Urumqi, Xinjiang, 830011, China
3.
Sinopec Key Laboratory for Enhanced Oil Recovery in Fractured and Vuggy Reservoirs, Urumqi, Xinjiang, 830011, China

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Received Date: May 28, 2019
Revised Date: July 04, 2019
Available Online: July 23, 2019

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Abstract

Abstract

The fractured and vuggy carbonate reservoirs of the Tahe Oilfield suffer a deteriorating water flooding development due to the large development scale and pattern uncertainty of fractures and vugs, coupled with a high degree of heterogeneity. In order to provide references for gas injection development, the vertical differentiation velocity after nitrogen injection in those reservoirs and its effect were analyzed. Based on the mechanical relationship, the vertical differentiation velocity analytical equation of nitrogen was established under the conditions of fractures and vugs. A physical test model was constructed from 3D printing technology, and the verification of numerical simulation was based on the physical simulation test. The influences of nitrogen injection rate, crude oil viscosity, oil-water interface, and gas-water ratio on the lateral distribution of nitrogen in reservoirs with fractures and vugs were studied in combination with numerical simulation. The study results suggested that lateral sweepage area of gas will increase with the increase of injection rate, along with a decrease of crude oil viscosity and the elevation of oil-water interface. However, the effect of gas-water ratio on the lateral sweepage area of gas is irregular.
- vuggy reservoir,
- carbonate reservoir,
- gas injection development,,
- nitrogen,
- injection rate,
- vertical variation,
- transverse scope,
- Tahe Oilfield

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Study on Vertical Differential Velocity and Transverse Scope of Nitrogen Injection in Carbonate Reservoirs with Fractures and Vugs in the Tahe Oilfield

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