Drilling fluid should be prepared as above, then filtered such that the filtrate obtained is rep of the filtrate lost to the development via the filter cake.The synthetic-based drilling fluid with NSF has the advantage of causing no swelling damages to the storage tank, as well as saves the cost of drilling fluid due to the fact that it doesn't need to take care of the ecological troubles (the sulfur and fragrant hydrocarbon materials were 0., brine, acid) must be prepared consisting of all additives prepared for the well.

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