In 1971 geologists discovered a large underground cave filled with natural gas while drilling in the Turkmenistan village of Derweze.
1971年，地质学家在土库曼斯坦达尔·瓦扎村庄进行钻井工作时，发现了一个巨大的充满天然气的地下坑洞。
The find was made 1.5 miles (2.5 kilometers) underground during exploratory drilling for geothermal energy.
这次发现是在一次地热能钻探时，钻到地底1.5英里(2.5千米)的一次偶然事件。
Open-pit mining follows the same sequence of oprations as underground mining: drilling, blasting, and loading and removing waste and ore.
露天采矿遵循与地下采矿相同的作业顺序：钻孔、爆破、装载并运走废料和矿石。
Open-pit mining follows the same sequence of operations as underground mining: drilling, blasting, and loading and removing waste and ore.
露天采矿遵循与地下采矿相同的作业顺序：钻孔、爆破、装载并运走废料和矿石。
Complicated formation condition and underground pipe network condition are the important factors that influence the quality of guided drilling of trenchless technology.
地层和地下管网条件复杂是影响非开挖导向钻进质量的重要因素。
The monitoring on underground coal bed combustion relied on drilling supervising in the past, but this method is not good.
对地下煤层燃烧过去一直依靠钻孔进行监测，未有有效的监测方法。
Research on vibration problems which is the main reason causing bottom drilling tool failure, can reduce drilling tool damage and emergence of underground accidents.
振动问题一直是引起底部钻具失效的主要原因，对其进行研究能减小钻具损害和各类井下事故的发生。
Horizontal Directional Drilling technology is widely used in urban underground pipe laying engineering.
在非开挖工程中，水平定向钻进技术广泛应用于城市地下管线铺设工程。
The drilling waste being injected to underground by hydraulic fracturing is the optimal treatment method of drilling waste on offshore oilfield for its low costs and zero discharge of waste.
通过井下水力压裂方式将钻井废弃物回注到地下是目前海上油气开发钻井废弃物处理最优方法，不仅成本低，而且可以实现废弃物零排放。
Applying: broadly used in the outer current cathode protection of the sea oil drilling platform, underground pipe and cable etc.
应用：高硅铸铁阳极广泛应用于海上石油钻井平台，地下管道地下电缆等设施的外加电流的阴极保护。
The method of cement slurry injection through big-shift directional drilling and its technological parameters used in Gaoyang Iron Ore Mine to seal underground water rushing are introduced.
详细介绍了高阳铁矿实施大位移定向钻孔注浆方法和工艺参数，其成功的经验对治理矿山井下突水淹井事故具有一定的参考价值。
Salt caverns are underground cavity formed by drilling and water circular melting salt in underground salt layer.
盐穴就是在地下盐层中通过钻井，利用水循环的方法，将盐层溶解，最终形成一个体积较大的空洞。
By using drilling in pit, ore reserve classification is increased, risks of underground mining engineering are reduced and avoided.
主要阐述了矿区通过实施坑内钻探，提高储量级别，降低和避免井下采矿工程风险，节约了成本，增加了效益。
Engineers trying to rescue 33 miners trapped underground in Chile for more than six weeks have begun drilling a third escape tunnel.
努力救援智利陷入地下超过六周的33名矿工的工程师们，开始起钻第三条逃生通道。
The important function is detailed on drilling technology for hydrological well applied in exploitation and utilization of underground water resources, especially in deep layer.
论述了我国水文水井钻探技术在地下水资源(特别是深层地下水资源)开采与利用中的重要作用。
On the other hand, drilling and blasting are main construction method of the underground project excavation, it can't be ignored that the vibration response of surrounding rocks on dynamical loads.
另一方面，钻爆法仍然是地下工程开挖的主要施工方法，围岩在动态荷载作用下的振动响应也是一个不可忽视的问题。
The whole section explosion method which is the one for underground construction digging, suitable for stable and strong dam, form a section for one time by drilling explosion.
全断面钻爆法适用于围岩坚固稳定，采用钻孔爆破方法将洞室开挖断面一次性开挖成型的地下建筑工程洞室开挖掘进方法。
The phenomenon of reservoir permeability decrease caused by drilling, completion and other underground operation is known as formation damage.
在钻井、完井等井下作业过程中，造成油气层渗透率下降的现象通称为油气层损害。
Drilling is an underground construction which has high investment and high risk. Every component of drilling work may lead to different kinds and different levels accidents.
石油钻井是一项高投入、高风险的隐蔽性地下工程，每一作业环节出于自然或人为原因均有可能导致不同程度、形式各异的事故灾难。
Serial blasting crater test method was used in underground medium and deep hole mining of Dahongshan copper mine for determining drilling and blasting parameters, and good results were obtained.
大红山铜矿地下中深孔采矿中，采用系列爆破漏斗试验方法确定中深孔采矿凿岩爆破参数，取得了较好的效果。
Accurately predicting the pressure underground could not only decrease drilling risks, but also indicate the migration path of oil and gas.
准确的地层压力预测不仅能规避钻探风险，还能指示油气的运移方向，为油气勘探提供依据。
Crude oil extraction process is mainly divided into exploration, drilling, production, and distribution of underground work.
原油开采过程主要分为勘探、钻井、采油、井下作业和输送。
The field test indicated that the developed drilling rig is appropriate for underground pre-drainage of coal seams.
现场试验表明，这是一种适于井下工作面钻进瓦斯预抽放短钻孔的轻便高效钻机。
Its extracting method includes surface well drilling and underground mine tunnelling. The tunnelling method is suitable for many mine areas in our country.
开发煤层气的方法有地面钻井开采和井巷开采两种，其中井巷开采方法适用于我国许多矿区。
The technique of underground pipeline laying with guided/directional drilling is technologically intensive and eco-friendly.
近十年来，非开挖定/导向钻进技术用于敷设城市地下管线在我国得到了极大的推广应用。
The technique of underground pipeline laying with guided/directional drilling is technologically intensive and eco-friendly.
近十年来，非开挖定/导向钻进技术用于敷设城市地下管线在我国得到了极大的推广应用。
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