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| Water exit prediction while drilling from mid-shallow formation during gas drilling in Heba area, northeast Sichuan |
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FAN Xiang-yu1, SU Jing2, WANG Jun-rui3, ZHANG Ping1, HE Chuan-liang4
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(1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation in Southwest Petroleum University, Chengdu 610500, China;2.Oil and Gas Field in Sichuan of Southwest Oil and Gas Field Company, PetroChina,Suining 629000, China;3.CNOOC Supervision and Management Technology Service Corporation, Tianjin 300452, China;4.Logging Company of Southwest Petroleum Bureau, SINOPEC, Chengdu 610100, China)
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| Abstract: |
| Taking the mid-shallow of sand-shale formation in Heba area in northeast Sichuan as the main research object, the technology characteristics of the tools which were used to obtain the formation parameters information while drilling were analyzed based on the logging-while-drilling technology. The methods of predicting formation water exit layer were studied. And the quantitative prediction model of water yield of air drilling was established. The results show that the formation water exit layer can be predicted well by using this proposed method. Gas drilling effect is affected and limited by formation water exit. Under the conditions of commonly well bore and gas equips, the maximum water carry-overs of gas drilling and foam drilling are less than 3 and 10 m3/h respectively. The shallow formation with depth being less than 1.0 km and Shaximiao formation adopt gas drilling. Qianfoya formation adopts atomization drilling or foam drilling, and Ziliujing formation and Xujiahe formation adopt near-balance drilling with aerated drilling fluid or water base drilling fluid. |
| Key words: drilling information while drilling water exit prediction model northeast Sichuan area |
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