溜钻 meaning in English

drill string not well braked

At present , the competition of oil industry is very fury , so reducing the cost of exploitation of oil is imperative under the situation . but the oil drillers of our country are relatively old , and the control mode drops behind , which result in the long period of making hole and high ratio of aiguille attaint , which is the main restrict factor of reducing the cost of oil exploitation
随着石油行业竞争的日趋激烈，降低石油的开采成本就势在必行，于是研制新型的石油钻机就显得尤为重要，因为国内目前使用的钻机比较陈旧，控制方式非常落后，导致钻井周期长、钻头损坏率高，这是降低石油开采成本的重要制约因素；而且落后的控制方式使得钻井过程容易发生溜钻、卡钻等事故。