The aerated foam mud fluids can used in negative drilling, and enlarge the life of drilling bits for its low density, and low sap pressure.
充气泡沫泥浆由于比重低，液柱压力低，实现了负压钻进，能大幅度提高机械钻进，延长钻头寿命。
Different combinations of PDC drilling bits hydraulic parameters are comprehensively reflected by flow field energy transformation at oil well bottoms.
针对实际PD C钻头建立了不同的流场计算模型，比较分析了流场能量的变化规律。
Different combinations of PDC drilling bits hydraulic parameters are comprehensively reflected by flow field energy transformation at oil well bottoms.
PD C水力参数的不同综合表现为井底流场能量的变化。
Since 1958, he ever judged the drilling bits' working situations repeatedly according to the sounds from under the wells to stop the accidents happening.
从1958年以后，他曾多次根据井下声音判断钻头使用情况、杜绝事故发生。
With 20 years'production practice, the writer proposes the methods of improving the service life of wire - line impregnated diamond drilling bits from 8 aspects.
通过近二十年的生产实践，从胎体配方等八个方面提出提高绳索取芯孕镶金刚石钻头寿命的方法。
By dynamical drilling tools matching with PDC drilling bits, drilling rates are able to be increased greatly, drilling costs are decreased greatly, and the drilling cycles are shortened.
动力钻具配合PD C钻头钻井，可以大大地提高机械钻速、降低成本、缩短钻井周期。
The valve at the bottom of auger can prevent drilling bits entering hollow pipe during operation. When drilling pipe is taken out and concrete grout is injected, the valve will be opened.
螺旋钻头底部阀门防止钻进过程中钻屑进入到空心的混凝土管中，当钻杆提出同时混凝土浆注入时，钻杆底部的阀门将被打开。
He was a tool pusher essentially, sold drill bits to oil-drilling companies.
他其实就是一个工具推销者，卖钻头给开采石油的公司。
Potter drilling is trying to commercialize a new drilling technique that replaces drill bits with... hot water.
PotterDrilling公司正努力将一种用热水替代钻头的新型钻探技术投入商业化运作。
Bit gauges, rings of defined circumference, are slipped around drill bits to detect and measure wear, which reduces the circumference of the bit during drilling.
钻头规是种周长一定的环型物，它卡紧在钻头的周围，去检测和测量钻头是否磨损，即在钻井过程中是否减少了周长。
A new type of rotary bits was manufactured by processing the PDC product into drilling cutting buttons and then embedding them into rotary bits.
将金刚石复合体加工成凿岩切削齿，应用于旋转钻头上，设计制造了新型旋转钻头产品。
Rock drill-ability is the basic parameter to optimize bits, make drilling plan and reduce drilling cost.
岩石可钻性是优选钻头，制定生产定额以及降低钻井成本的基础。
It is proposed that economical performance of diamond bits be quantitatively appraised by use of bit drilling cost.
并提出用钻头钻进成本定量地评价金刚石钻头的经济效果。
While drilling in the same formation with the same drilling parameters, the penetration rate of bits of the same degree of wear depends mainly on their cutting structures.
在地层、钻井参数和钻头新度相同的情况下，钻头机械钻速的快慢主要取决于钻头齿面结构是否合理。
Test results show diamond enhanced tungsten carbide composite spherical crown button bits are the ideal bits in drilling cobble and gravel formation.
试验表明金刚石—硬质合金复合球齿钻头是一种理想的钻进卵砾石层的钻头。
PDC bits have been used to drill the homogeneous formation from soft to medium-hard, but they are not suitable for drilling in gravel and multi-interbedded formation.
PD C钻头用于软到中硬的均质地层钻进具有钻速高、寿命长等特点，但不适合含砾石地层和软硬交错地层。
In addition, the drilling characteristic curves and the performance of PDC bits designed with different schemes are predicted.
此外，还对PD C钻头的钻进特性曲线，以及采用不同设计方案时的钻头性能进行了预测。
Aimed at resolve the several problems which affect drilling efficiency, such as balling up and calcareous cementation, the design of blade bits was modified.
针对钻头包泥堵钻和钙质胶结层难以进尺等影响钻进效率的几个问题，对刮刀钻头结构进行了改进设计，并取得了令人满意的效果。
Through drilling experiment in 156 adjustment Wells, the drilling behaviors, cutter wear, downhole jet flow field and drilling effect of drag bits and roller ones were comparatively analyzed.
通过156口调整井钻井试验，对比分析了刮刀钻头和牙轮钻头的钻进特性、牙齿磨损特性、井底流场特性及钻井效果。
The flow field of PDC bits is very complicated during drilling process, while optimizing its hydraulics parameters is an effective method to improve its drilling performance.
PDC钻头在实钻过程中井底流场非常复杂，而优化其水力学参数是提高钻头钻井能力的有效手段。
Thee main products are: all kinds of diamond drill bits, PDC bits, casing boots, reaming, single and double tube wireline coring drilling, coring drill pipe, casing and other drilling tools.
主要产品有：各类金刚石钻头、复合片钻头、套管靴子、扩孔器、单双管绳索取芯钻具、绳索取芯钻杆、套管及其它钻探工具。
Conventional double tube bits should be used as bits for drilling, while coring tool is double tube.
当取心钻具采用双层管时，钻进所用的钻头就需要用普通双管钻头。
The junk basket is used by the rig crew to store an assortment of relatively small parts of the drilling rig, ranging from drill bits to crossover subs to lifting subs to spare kellys.
杂物堆放柜是井队分类堆放相对较小的钻机部件的地方，从钻头到转换短节，到提升短节到备用方钻杆等。
The results show that the vibration of drilling strings will produce the fluctuation of weight on bits by random excitation, so the bit life and drilling rate are affected largely.
结果表明，在地层随机激励作用下，钻柱的振动将会引起钻压的波动，从而影响钻头的寿命及其钻进的速度。
The structure and manufacture of new type of bits, working principle and types of fluidic drilling tools, action mechanism of anti-cave-in thinners, for difficult formation drilling were discussed.
阐述了难钻进地层用新型金刚石钻头的结构、制造特点，射流式钻具的原理、类型，以及防塌型稀释剂的作用机理。
Diamond coring bits are utilized for core drilling.
在取芯钻井井段，选用金刚石取芯钻头。
He essentially, sold drill bits to oil-drilling companies.
他其销者，卖钻头给开采石油的公司。
Roller bits are used widely in water well drilling.
目前牙轮钻头已较为广泛地用于水井钻探。
Field drilling experiments have verified the advantages of the new bits, and the all round performance index of the new bits increased 179% compared with that of the traditional bits.
现场应用证实了这种新型钻头的优越性，钻头综合指标较一般钻头提高179%。
By using this program, the performances of single cone bits with different structures under various drilling conditions can be compared and evaluated.
采用该仿真程序可对不同钻井条件下不同结构单牙轮钻头的性能作出比较和判定，也可预计尚未制成钻头的钻进能力。
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