The first point, chosen screen mesh is not reasonable. Each vibrating screen for 50 per L/s, this is because of the test condition is processing according to the provisions of the state standard: select 60 purpose sieve net, in weight for 1.8 increase mud test, the viscosity mud for mud contains different particle size of the river sand. The rapid surface drilling, produce the large amount of solid phase takes up the effective screen area, so the vibrating in shallow Wells period can use fine sieve net. Therefore, the early larger hole drilling shall use the screen, and with the increase of drilling depth, gradually adopt more fine sieve net.
The second point, formation and mud conditions affect productivity. Because of the drug failed to add drilling fluid dissolves, paste in on the screen, right now has a serious run plasma phenomenon. Should wait until
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