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《Natural Gas Industry》 2005-04
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STUDY AND TEST OF CO_2 FRACTURING TECHNIQUES FOR SAND RESERVOIRS WITH LOW PRESSURE AND PERMEABILITY

Lei Qun, Li Xianwen, Mu Lijun, Ji Zhenning, Wang Xiaoduo and Ma Xu (Changqing Oilfeild Branch, PCL)  
Aiming to the features of upper Paleozoic sand reservoirs with low permeability and pressure in Changqing Oilfeild, to reduce the damage of the gas reservoirs with low pressure and improve the production-increasing results, the systemic study and engineering tests of CO 2 fracturing techniques are conducted in Changqing Oilfeild since 2000. Total 23 layers in 21 wells are fractured in the gas wells of Yuling, Sulige, Qingbian etc. gas fields early or late. The depth of the gas layers is 3000 — 3500 m. The maximum sand filling volume for a single well is 47.8 m 3. The average sand proportion reaches to 29.5%. The CO 2 foam accounts for 25% — 64%. CO 2 fracturing achieves obvious production-increasing results for most of the wells. With the study and tests, the CO 2 fracturing techniques system are formed, which consists of the acid cross-linked fluid system, the design method and operating techniques with constant internal phase and variable proportion, and the matching equipment.
【CateGory Index】: TE377
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