Fracturing Mechanism of Difficult-to-Fracture Thin Poor Reservoir Layers and Controlling Measure
| Autor: | Yumei Wang, Junxia Ma, Zhang Juanxia, Jiandong Liu, Youcai Zhang, Shengguang Zhuo, Luhe Shen |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Depressurization Modification
Materials science Fracture pressure Petroleum engineering High density General Medicine Fracture Pressure Cementation (geology) Acidification - Treatment Difficult-to-fracture thin layer Daqing oilfield Wellbore Permeability (earth sciences) High calcium Geotechnical engineering Engineering(all) Stress concentration |
| Zdroj: | Procedia Engineering. 26:1864-1871 |
| ISSN: | 1877-7058 |
| DOI: | 10.1016/j.proeng.2011.11.2378 |
| Popis: | It was used for development target of supplementary layers of production for the thin and poor reservoir layer, and it was considered as difficult-to-fracture layer as high calcium content and compact cementation, the emphasis was focused on study and application of fracturing technology in Daqing oilfield in this paper. The rock which was difficult to fracture had the characteristics of high density, high strength and impermeability, so it was difficult for the fracturing fluid to enter the formation. Therefore, it should firstly to overcome the wellbore stress concentration and when the fracture pressure was higher than thirty-seven MPa. The acidification treatment was used as the method of layer modification, through the method, the cementation among the rocks was destroyed and the tensile stress of the rock was decreased; the permeability near the well bore was increased and then, the fracture pressure would be decreased. For the section which had large difference value of fracturing pressure, rational design of sand volume in single slit should be by forecasting difference value of fracturing pressure. The single slit emission should to be higher than 0.5 m3/min, and then it can ensure the normal construction under the conditions of present construction scale and adding sand program conditions. |
| Databáze: | OpenAIRE |
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