APPLICATION OF MULTISTAGE HYDRAJET-FRACTURING TECHNOLOGY IN U-SHAPE COAL BED METHANE WELL
APPLICATION OF MULTISTAGE HYDRAJET-FRACTURING TECHNOLOGY IN U-SHAPE COAL BED METHANE WELL
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发表时间：
2013
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通讯作者：
T. Dazhen
中科院分区：
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作者：
T. Dazhen
The YP1 well group in coal bed mathane is a U-shape well composed of two wells. One is a horizontal screen pipe well YP1, the other is a vertival well YP1V. Based on conditions and characteristics of the YP1 well, the operating tool string, the dimension of hydrajet-fracturing tool and the combination mode of nozzle were optimized. In order to decrease the sanding in risk in YP1 well with small diameter screen casing, the dragging hydrajet-fracturing tool and sliding sleeve tools were combined. And then, two technologies were mixed together. Moreover, the jetting fluid with sand was discharged from well YP1V, well YP1 was successfully fractured four stages by multistage hydrajet-fracturing technology. 83m3 proppants in total were placed. Finally, the fracturing string was pulled out of the well. The results showed before U-Shape well fracturing, there was no gas output, but the production increased to the max 636 m3/d after hydraulic fracturing because of discharge water and decompression.
