地层的

The late Triassic strata unconformably overlying the granite indicates that the formation time of these thrust structures might be from the late Permian to the early Triassic, no later than the Late Triassic.

西北缘晚三叠世地层不整合覆盖于花岗岩之上，这种现象将本区冲断构造发生的时间限定为晚二叠世至早三叠世，最晚不超过晚三叠世。

A formula for calculating the minimum underbalance in lower permeability reservoir is obtained by applying a drag force function to testing data.

通过将拖曳力函数用于油田测试数据，提出了确定低渗透地层最小测试压差的公式和方法。

The core of this difficulty is how to keep the circulating pressure at the well bottom lower than the pore pressure or reservoir pressure within a proper margin (i.e., to design the underbalance degree).

其核心问题是如何在钻井过程中保持井底循环压力低于地层孔隙压力或储层压力在一个合适的范围内。

The characteristics of the salt formation in Tarim Basin is deep, high temperature and high pressure, easy to result in the undergauge, collapse, drill bit or pipe sticking.

针对塔里木盆地石炭系盐层埋藏深，温度高，地层压力大，极易发生&缩径、坍塌&，造成卡钻，同时由于盐岩层的塑性蠕动，形成不规则井眼，甚至造成套管挤毁变形事故，井身质量难以控制，固井质量难以保证等问题，通过对同类型已钻井进行总结分析，提出了一系列钻井技术措施，并在T726井严格实施。

It is difficult for conventional reflection seismic surveys to get the information of low velocity layers underlain high acoustic impedance layers, such as evaporites and basalts.

在蒸发岩、玄武岩等高阻抗岩层发育地区，常规反射地震往往难以获取高阻抗层以下的地层地质信息。

The physical chemistry properties of evaporite beds in Bachu area are analysed.On the basis of the feature of salt beds,the undersaturation salt water drilling fluid is determined.

塔里木盆地复合盐层地层分布广，在不同构造的钻探中都钻遇盐层，盐层厚度一般几十米到几百米，岩性以盐岩与膏岩、泥岩、泥质粉砂岩等不等厚互层。

Undrilled formation pressure prediction is very complex.

摘 要：井底以下地层压力预测是一项十分复杂的研究课题。

Comparing to conventional resistivity log, the high resolution array induction logging has higher resolution and deeper invertigation. So it could confirm uninvaded formation resistivity, flushed zone resistivity and invasion radius, and also provide reliable geologic parameters for reservoir description and evaluation.

高分辨率阵列感应测井克服了常规电阻率测井纵向分辨率低、探测深度浅和不能解释复杂侵入剖面等缺点，可以准确确定原状地层电阻率、冲洗带电阻率和侵入半径，可为储层描述、储层评价提供可靠的地质参数。

Formation waer influence the efficiency of borehole cleaning, if it can't be found in time, it is very unfavorable for gas drilling.

地层水进入环空将影响井眼的净化效率，如果不能够被及时发现，对气体钻井非常不利。

It is sharp, wear-resistant, the PDC can be self-sharpening cutting teeth as a cutting edge in low WOB high penetration rate can be,(cone bit higher than 2 times more) and high-footage (cone bit higher than the 4-6 times), applicable to soft - in the hard formation.

它以锋利、耐磨、能自锐的PDC切削齿作为切削刃、在低钻压能获得高钻速、（高于牙轮钻头2倍以上）及高进尺（高于牙轮钻头4-6倍），适用于软-中硬地层。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失