Frac and pack technology is both a effective stimulation and sand control treatment, and a new completion method in unstable crumbly formation and high permeability reservoir.
压裂充填工艺是中高渗透油气层和不稳定松软地层的有效增产、防砂措施，又是一种新的完井方法。
During this month, I learned lathe work, miller operating, benchwork, digital control processing, sand mold casting, heat treatment, and welding.
在一个月中，我们学习了车工，铣工，钳工，数控加工，沙型铸造、热处理、焊接等等。
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