Microseismic characteristics of shale gas wells with casing deformation in Changning, Sichuan
CHEN Zhaowei1, ZHANG Haozhe2, ZHOU Xiaojin3, CAO Hu2
1. CNPC Engineering Technology R & D Company Limited, Beijing 102206, China; 2. China University of Petroleum (Beijing), Beijing 102249, China; 3. Shale Gas Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610051, China
Abstract:To address the casing deformation of shale gas wells in Sichuan Basin, this paper calculates the casing deformation of the H19 platform with a small bridge plug size and multi-finger image tool(MIT) data and analyzes the characteristics of the spatial and temporal distribution and moment magnitude of microseismic events at casing deformation points. The fracture surface model is established depending on the spatial distribution characteristics of identified natural fractures. The quantitative relationship among casing deformation, natural fracture scale and microseismic moment is analyzed by the model. There were 9 deformation values, with the minimum of 6.10mm and the maximum of 50.43mm, averaged to be 28.03mm. The spatial and temporal distribution characteristics of microseismic events are as follows:①The microseismic events are not symmetric about the wellbore; ②most of the microseismic events in different fracturing stages are overlapped spatially, showing linear distribution; ③there are many large-moment-magnitude events; ④the frequency of large-moment-magnitude events is relatively high in the middle or late fracturing period. According to the calculation with the fracture surface model, the area of the fractures causing casing deformation in shale gas wells in the Changning area is 40000~70000m2, the seismic moment 2.57×109~7.57×1010N·m, and the moment magnitude range is -1.16~0.79. These results have guiding significance for real-time monitoring and early warning of casing deformation according to microseismic events and prevention of casing deformation via the judgment of natural fracture scale.
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