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Ji Z.,Ultra Low Permeability Reservoir Research Center
Well Testing | Year: 2011

The combined operation tech for APR pressure-controlled test solves the technical problems in gas testing for deep carbonate rocks and shallow layer of continental clastic rocks in northeast Sichuan, it will be the important development direction for perforation, measures of transformation, and gas test in Northeast Sichuan. The technology plays an active role for speeding up the test gas velocity, improving quality of gas test data, increasing the test time, reducing test gas costs, and lightening labor intensity, at the same time, the application of this tech, it can make the gas layer avoid the second pollution from killing fluid, prevent blowout and other accidents, which protect the gas reservoir and local ecological environment effectively. Source


Du X.,Ultra Low Permeability Reservoir Research Center | Bai X.,Ultra Low Permeability Reservoir Research Center | Qi Y.,Ultra Low Permeability Reservoir Research Center | Chen B.,Ultra Low Permeability Reservoir Research Center | Yin G.,Ultra Low Permeability Reservoir Research Center
Well Testing | Year: 2014

Huaqing Chang6 reservoir in Changqing oilfield is the typical ultra-low permeability one, at where water flooding technology for horizontal well can improve developing effectiveness, and how to optimize fracture design is the key to improve it. Based on the analysis of reservoir characteristics and combined with injection patterns, fracture length, the number of transformation segment, manner of arranging cracks and operation parameters of the horizontal wells are optimized and studied, and transformation parameters suiting for Huaqing Chang6 ultra-low permeability reservoir are proposed. 24 trail practices in horizontal wells show that the combination of parameters has better adaptability, and horizontal well production reaches 10.3 t/d, which is as 5 times as that of straight well. Source


Gao W.,Ultra Low Permeability Reservoir Research Center | Chen B.,Ultra Low Permeability Reservoir Research Center | Wang C.,Ultra Low Permeability Reservoir Research Center | Yin G.,Ultra Low Permeability Reservoir Research Center | Du X.,Ultra Low Permeability Reservoir Research Center
Well Testing | Year: 2014

To ultra-low permeability reservoir with natural fracture of Chang6 reservoir in Huaqing oilfield, the "fracturing network" technique is proposed which depends on the larger quartz particles or Special plugging agent for increasing the net pressure of fractures in the fracturing process. Through this way, the natural fractures are opened and expand, and the network is formed with higher production in oil wells. Through the parameters optimization and field trials in 18 wells, the average single well daily increased oil is 0.38t, the results is significant. Besides, the success of this technique also provides a strong basis for the stimulation in ultra-low permeability reservoir. Source


Bai X.,Ultra Low Permeability Reservoir Research Center | Li J.,Ultra Low Permeability Reservoir Research Center | Lu H.,Ultra Low Permeability Reservoir Research Center | Qi Y.,Ultra Low Permeability Reservoir Research Center | And 2 more authors.
Well Testing | Year: 2012

The ultra-low permeable reservoir of Changqing oilfield is the typical three low reservoirs. For tightness of reservoirs, poor physical properties, and slight pore throat, the production of single vertical well is low, and the horizontal well is the key effective manner to increase single well production. At present, because Seven-spot well net of the Horizontal Well in Huaqing area of Changqing oilfield is deployed and the advanced injection technology and the hydraulic jet clustering multi-stage fracturing technology are used, the production of a normal horizontal well is 3 ~ 4 times of that for a conventional vertical well. However, content of water in parts of horizontal well after produced is high and that even are water flooded. It believed that the fractured channeling between injection and production wells is the main reason. A channeling path identification (CPI) index system has been established for ultra-low permeability reservoir. By using fuzzy clustering analysis method to classify the well group of injection wells, screening the advantages of injection wells, the foundation for the next step of treatment is made. Using this method to analyze and calculate the flooded wells of horizontal A well, horizontal B, the respective Superior injection wells have been obtained, and is as same as the calculated results by field dynamic verification. It indicates that this method can be applied to identify channeling in ultra-low permeability reservoir of the flooded horizontal well, and has a certain practicality. Source

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