Numerical simulation study on the bottom-water invasion in the carbonate gas reservoir with high angle fractures and high permeability zones

Yıl 2019, , 80 - 85, 31.07.2019

Shuang Zhang , Huiqing Lıu Jie Baı

https://doi.org/10.22399/ijcesen.535713

Öz

Numerical simulation of carbonate gas reservoir with bottom-water is still a challenging issue, due to the presence of nature conductive fractures. When the water invades into the gas well, the permeability of gas phase decreases sharply. The high angle fractures and high permeability zones have a serious impact on the production performance of the gas wells. The characteristic of the water invasion was unpredictable in conventional dynamic analysis.

In fractured carbonate reservoir, the geometric shapes of the angled fracture are difficult to be described using commercial numerical simulation software. The method that calculating the pseudo relative permeability of the grid block containing high angle fracture was utilized in this paper. Through this method, the rapid water advancement in the conductive fracture was accurately tracked without modifying the grid geometry, and the influence of the conductive fracture to the water breakthrough phenomenon was studied by using the IMEX module in CMG. 

The results show that the water invasion intensity depends on the conductivity of fracture, and the higher the conductivity is, the shorter the water breakthrough time is. The breakthrough time of water is affected by the angle of the fracture, the relative horizontal distance, the length of the fracture, the production rate and the type of water invasion. According to the characteristic curve, the type of water invasion can be quickly distinguished, which provides a basis for further study on the enhanced recovery of the fractured carbonate gas reservoir with water.

Anahtar Kelimeler

Carbonate gas reservoir, Bottom-water, Pseudo relative permeability, High angle fracture

Kaynakça

• [1] Huang, S., Yao, Y.D., et al. Pressure transient analysis of multi-fractured horizontal wells in tight oil reservoirs with consideration of stress sensitivity (ICCESEN 2017), 4-8 October, 2017 Antalya-Turkey. DOI: 10.1007/s12517-018-3639-7
• [2] Xia, C.S., et al. Ways and methods of enhancing recovery in various water-carrying gas reservoirs[J]. Natural gas industry, 2002, 22(z1):73-77
• [3] E, Altuncu., S, İriç. Evaluation of Fracture Toughness of Thermal Sprayed and Hard Chrome Coated Aluminium-Zinc Alloy(ICCESEN 2016), 19-24 October, 2016 Antalya-Turkey. DOI: 10.12693/APhysPolA.132.926
• [4] Peng, X.L., et al. Percolation model and numerical simulation of bottom water gas reservoirs with big fractures[J]. Natural gas industry, 2004, 24(11):116-119
• [5] Lingen, P., et al. Single Medium Simulation of Reservoirs with Conductive Faults and Fractures. In SPE Middle East Oil Show. Society of Petroleum Engineers, (2001). DOI: 10.2118/68165-MS
• [6] Rida, A.G., et al. Single porosity simulation of fractures with low to medium fracture to matrix permeability contrast. In SPE/EAGE Reservoir Characterization and Simulation Conference. Society of Petroleum Engineers, (2001). DOI: 10.2118/125565-MS
• [7] Feng, Y. Y. A research on water invasion performance of the gas wells in fractured bottom water reservoir[J]. Natural gas industry, 1998, 18(3):40-44
• [8] Mao, X.L., et al. Experimental and numerical simulation on the influence of anisotropic fracture network deformation to shale gas percolation (ICCESEN 2017), 4-8 October, 2017 Antalya-Turkey. DOI: 10.1007/s12517-018-3973-9