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| Quantitative analysis of gas injection volume for diesel engine tail gas drilling |
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HOU Xue jun1,2, GAO De li1
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(1.MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249, China;2.College of Petroleum Engineering in Chongqing University of Science and Technology, Chongqing 401331, China)
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| Abstract: |
| Diesel engine tail gas drilling is a kind of gas drilling with engine tail gas as circulating medium. The Z12V190 diesel engine tail gas composition, exhaust rate, oxygen content and minimum gas injection rate of tail gas drilling were analyzed and calculated. The results show that the diesel engine tail gas exhaust rate increases with the oxygen content increasing, and the oxygen content in tail gas can be reduced by increasing suction resistance and diesel engine load. The minimum gas injection rate increases with the pressure at key point increasing. The oxygen content in tail gas must be below 14％ in tail gas drilling. The diesel engine tail gas drilling applies only to low pressure condition because of the limited diesel tail gas rate. When all the three diesel engines are working, the total tail gas rate just reaches the minimum gas injection rate at 4 MPa, but when one or two diesel engines are working, the tail gas rate is only suit to the minimum gas injection rate at 1 MPa. |
| Key words: drilling diesel engine tail gas gas injection volume oxygen content |
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