It may be in a pool too small or too far from a potential market to justify the expense of drilling.
可能是储存它的池子太小，或与潜在的市场相距太远，因而钻井费用过高，不适宜开采。
Adopting the simulation experiment technique in the well drilling cultivating can shorten cultivating time enormously, and decrease the expense, and cut down the hazard.
在钻井培训中采用仿真试验技术，大大缩短培训时间，减少费用，降低了风险。
Adopting the simulation experiment technique in the well drilling cultivating can shorten cultivating time enormously, and decrease the expense, and cut down the hazard.
在钻井培训中采用仿真试验技术，大大缩短培训时间，减少费用，降低了风险。
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