The gradient of the tectonic additional hydrostatic pressure is the main cause of the long-distance migration of the fluid, oil and gas.
构造附加静水压力梯度是流体及油气长距离水平运移的主要原因。
Even if the pressure gradient is partly balanced by the fluid acceleration, its order of magnitude is usually no larger than the hydrostatic gradient.
即使压强梯度部分地被流体加速度平衡，其数量级通常也不大于静压梯度。
UBD is a drilling technique that reduces the hydrostatic pressure of the drilling fluid, causing the pressure in the wellbore to be less than the formation pressure.
UBD是一项钻井技术，此技术可以减少钻井泥浆带来的液体压力，引起的井身的压力远小于架构产生的压力。
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