In the original conditions, reservoir rocks and fluids inside the pore space in the pressure equilibrium, once the oil drilling, this balance was destroyed.
在原始条件下，油层岩石与孔隙空间内的流体处于压力平衡状态，一旦钻开油层，这种平衡就被破坏。
Although balance drilling is paid more attention to, Yitong exploration area in Jilin is still put overbalance drilling first for its unique and complex geological conditions.
虽然平衡钻井越来越受到勘探工作的重视，但吉林伊通探区因独特而复杂的地质条件，仍以过平衡钻井为主。
So in such a formation construction, it is important to use the technology of drilling mud back to tank to balance the pressure of the loose layer and prevent the borehole collapse.
所以在这种地层中施工，利用泥浆回灌钻孔技术有效地平衡松散层压力不使其垮塌尤为重要。
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