Influencing factors and controlling of acidizing fracture height in gas reservoir with bottom water of the second section of Sinian Dengying Formation in Anyue Gas Field Sichuan Basin
LI Song,1,2, YE Jiexiao1, GUO Fufeng3, HE Tingting1, HU Qiuyun1
1.Engineering Research Institute of CNPC Southwest Oil and Gasfield Company,Chengdu 610017,China
2.National Energy High⁃sour Gas Reservoir Exploitation and R & D Center,Guanghan 618300,China
3.Exploration and Development Research Institute of Southwest Oil & Gasfield Company,PetroChina,Chengdu 610041,China
The second section of Sinian Dengying Formation in Anyue Gas Field has great potential to develop, which is an important producing area of Anyue Gas Field. This reservoir has low permeability and partly developed high-porosity-permeability section. The reservoir space mainly includes karst caves, dissolution pores and fractures. The bottom water is developed in the lower part of the reservoir and the gas-water interface is unified at -5 150 m. The deep acid-fracturing technique can increase well production for such carbonate gas reservoir with low-porosity-permeability. However, there are some difficulties in acidizing fracture controlling because of natural high-angle fractures, small stress difference between sections, and the short distance between the stimulation section and the gas-water interface. It is easy to connect with the lower water layer, causing water production after stimulation. In order to explore the controlling method of acidizing fracture height, the geological and engineering influencing factors of acidizing fracture height were simulated, and a pseudo-three-dimensional extension model of acidizing fracture height was established, which considered the influence of longitudinal pressure drop on fracture height propagation in the process of fracture height propagation. The results show that the interstage stress difference and displacement are the main controlling factors of fracture height extension, and the stress difference has the greatest influence on fracture height, followed by the thickness of reservoir and interlayer and the viscosity of working fluid. The simulation results of mathematical model revealed the controlling factors and model for acid-fracturing fracture height in different reservoir characteristics. In this paper, the design parameters of acidizing controlled fracture height are optimized. Under the premise of effectively controlling the height of acid fracturing fracture, the production of single well can be maximized and water can be avoided after stimulation, which provides theoretical guidance for deep acid fracturing technology of gas reservoir with bottom water.
Keywords:Gas reservoir with bottom water
;
Low porosity and low permeability
;
Carbonate formation
;
Deep acid-fracturing technology
;
Fracture height
;
Fracture height containment
LI Song, YE Jiexiao, GUO Fufeng, HE Tingting, HU Qiuyun. Influencing factors and controlling of acidizing fracture height in gas reservoir with bottom water of the second section of Sinian Dengying Formation in Anyue Gas Field Sichuan Basin. Natural Gas Geoscience[J], 2022, 33(8): 1344-1353 doi:10.11764/j.issn.1672-1926.2022.03.003
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