Abstract:

The well Longye-1HF is one of the key exploration wells locating in Wulong syncline structure of southeast Sichuan. Its target stratum is Longmaxi formation of lower silurian. Compared with the fracturing of the shall wells in anticline of Jiaoshiba area in the city called Fuling, the well Longye-1HF have the characteristics of high fracture pressure, high extension pressure and difficult sand adding. According to the geologic condition of Wulong area, Longmaxi formation has good lamellation development and high quartz content. However, the ground stress difference coefficients are small. In order to stimulate the transform volume of the reservoir, the research were conducted on the fracturing technology of the atmospheric shale horizontal wells in Wulong. Through the pumping bridge plug and perforating technology, we selects a mixed fracturing fluid of low damage slick-water and activity glue, and optimizes the construction displacement and fracture parameters. The fracturing construction is divided into 17 segments, and after fracturing, it achieves 6.2×10 ⁴ m ³/d industrial gas. The results verify the gas bearing properties of the middle-shallow shale reservoir in Wulong block, and the production capacity achieves the breakthrough.

Key words: staged fracturing, fracturing fluid, propping agent, well Longye-1HF