Whereas when using bowl shaped bit,the success ratio of branching is high, process simplified,time saved and cost reduced.
而碗状钻头人为叉孔成功率高,施工工艺简单,节省了时间,降低了成本。
what are presented will be undoubtedly helpful to the study and manufecture of Chip bit using the in.
根据深圳各采场的凿岩需求，我们成功地利用高频设备钎焊出７６ｍｍ的片状钻头，这是我院对于大直径片状钻头的首次尝试。
The Numerical Simulation of Closed-die Forging Process for a Forging Used in Manual Electric Drills;
手工电钻钻体闭式模锻工艺的数值模拟
Study on Dynamic Characteristics and Failure Mechanism of Drill String in Air Drilling
气体钻井钻柱动力学特性及钻柱失效机理研究
Converting gas drilling to conventional drilling within short time
气体钻井快速转换为常规钻井的钻井液技术
solid carbide subland drill
整体硬质合金阶梯钻
solid carbide twist dril
整体硬质合金麻花钻
The worms have perforated the mucosa to suck blood.
虫体钻入粘膜吸血。
Any of various mollusks that bore into soft rock or wood.
钻蛀虫钻入松软岩石或木头中的软体动物
What Caused the Pipe Sticking in Completed Wells in Block Longgang
龙岗地区气体钻井结束后卡钻原因分析
EXPERIMENTAL EVALUATION ON FORMATE BASED DRILLING FLUIDS FOR GAS HYDRATE DRILLING IN OCEAN WATER
海洋水合物钻井用甲酸盐钻井液体系研究
STUDY ON THE INFLUENCE OF ABNORMAL WELL BORE ON BOTTOM HOLE ASSEMBLY STRESS IN GAS DRILLING
非正常井眼对气体钻井下部钻具受力影响研究
Application of Roller Bit Combination Drilling Technology in Nappe Strata of Qingxi Oilfield
牙轮钻头复合钻进在青西推覆体地层的应用
Study on matrix performance of iron-based diamond bit and drilling tests
热压铁基金刚石钻头胎体性能及钻进试验研究
Development of Abrasive Water Jet Drilling-cutting Aiguille and Experiment Study on Cutting Performance of Abrasive
磨料射流钻割一体钻头研制及切割特性研究
To draw off(a liquid) by piercing a hole in a cask or other container.
钻孔汲取通过在桶或其它容器上钻孔来汲取（液体）
Less perfect forms, known as "boat" and "carbonado" are clusters of tiny crystals.
稍次些的则由细小的晶体群组成，称为“圆粒钻石”和“黑钻石”。
Compared with health and vitality, gold and diamonds are nothing valuable.
拿体力精力与黄金钻石比较，黄金和钻石是无用的废物。
Study on the Drilling Project Management of Daywork Contract System Oriented HSE;
新疆钻井公司面向HSE的日费制钻井项目管理体系研究及应用
A Study on Ultra High Temperature Drilling Fluid System(Ⅳ):Brine Drilling Fluid Design and Evaluation
超高温钻井液体系研究(Ⅳ)——盐水钻井液设计与评价