构造的不确定性、储集层的非均质性及钻井过程中的各种工程因素，都使水平井的钻井成功率受到影响，新开发区块更是如此。
Structural uncertainty, reservoir's anisotropic and various engineering factors in drilling can influence the success rate of drilling horizontal Wells, especially in new development zone.
该技术在大港油田已应用70余井次，成功率达814％，有效期均半年以上，为合理高效开发高渗出砂油藏提供了一条新的途径。
The technique has been applied over 70 times, and the success rate is up to 81.4%, sand controlling duration is over half year.
欠平衡钻井和欠平衡测井技术对于直接发现和保护油气层、提高单井产能和勘探开发成功率具有非常重要的意义。
Under-balanced drilling and under-balanced logging are very important techniques for directly identifying and protecting hydrocarbon reservoirs and enhancing productivity.
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