回压

Results Of five cases,scaphocephaly was seen in one case and oxycephaly and brachycephaly were revealed in two cases respectively.All cases demonstrated the deepened impressions for cerebral gyri.The antedisplacement of the sphenoid body and the smaller orbit were seen in four cases.One case with oxycephaly demonstrated the enlarged supratentorial cerebral ventricles on CT.One case with brachycephaly showed a depressed skull,narrowing of the optic foramen and obvious protrusion of both eyes on CT.Conclusion The radiological manifestations of cranial stenosis were characteristic.

结果 5例狭颅症，1例表现为舟状头畸形，2例表现为尖头畸形，2例表现为短头畸形，5例均可见脑回压迹加深，4例可见蝶骨体前移及眼眶变浅，1例尖头畸形CT扫描可见幕上脑室扩大，1例短头畸形CT扫描示颅骨内板呈波浪状凹陷，视神经孔变窄，双侧眼球明显突出。

Excessive formation back pressure may be due to limited or plugged perforations; subsurface or surface chokes; undersized gas-oil separator, flowlines, tubing, or casing; or excessive back pressure on flowline, casinghead gas gathering system, or gasoil separator.

183u 译文：过高的地层回压也许是由于有限的或堵塞的射孔孔眼；井下或地面油嘴；尺寸不足的气液分离器，流动管线，油管或套管；流动管线，套管头气体集输管线或气，油分离器上过高的回压。

By making use of multi-points backward pressure of one dry gas well, this paper introduces how to confirm dynamic friction coefficient of downhole tubing at the exact moment through stable testing material, gives the productivity and the corresponding bottom hole pressure by using productivity equation, calculates wellhead pressure in combination with dynamic friction coefficient of tubing, establishes the correct wellhead outflow performance equation for this well, draws out wellhead outflow performance curve and discusses how wellhead outflow performance equation or wellhead outflow performance curve changes with the decrease of formation pressure or the change of wellhead outflow performance curve.

借助1口干气井的多点回压法试井资料，介绍了如何利用气井稳定试井资料，确定该气井此时此刻井下油管动态摩阻系数；利用产能方程给出产量和对应的井底压力，结合油管动态摩阻系数计算井口压力，建立该井准确的井口流出动态方程并编绘井口流出动态曲线；讨论了随着地层压力递减和井下油管动态摩阻系数变化规律，井口流出动态方程或井口流出动态曲线的变化规律。

However, the flow pattern in the diverging section does change as you lower the back pressure further.

不过，水流流态，在不同的区段是否改变，因为您降低回压进一步。

Key techniques for well testing with electric submersible pump on floating drilling vessel have been studied and developed to solve the conventional testing problem that the flowing production test can not conducted by using natural energy because of lack of feed flow or high back pressure of hydrostatic column to formation due to well style.

针对地层供液不足或因为井型使得静液柱对地层的回压过高而不能利用天然能量进行自喷求产从而导致在浮式钻井装置上无法进行评价井常规测试的难题，研发了浮式钻井装置电潜泵测试关键技术并成功应用。

To resolve the problem, based on backpressure test theory and superposition principle, this paper designed a new test method, named Backpressure Isochronal Test.

以回压试井理论和渗流叠加原理为基础，提出了"回压等时试井"产能评价方法，该法所需测试时间与"单点法"大致相同，但能较准确地评价低渗气井产能。

The most common type uses spring tension and pressure against a plunger to maintain the pressure.

最常用的一种回压阀使用弹簧张力和对柱塞的压力来保持压力。

Gathers because of a common goal in the middle of same place this 38individual, each enlistment reason is all dissimilar: Comes from布雷恩 Rawlins is for redeem to Texas 回抵 presses for the bankranch; The family extends the woods in Nebraska state William, then isfor maintain the family honorable tradition; Bragg Si fatigueSwitzerland in order to evade the too severe father; The eddy is feelsself-important compared to the standard, is unable confidently theperson which passes facing oneself; Eugene 斯金纳 is here onlyblack, his arrival is for "feels grateful", because France not onlyallows him to participate in the boxing champion to strive forhegemony the match, but also gives him the most reasonable treatment,but in US, the public place all does not allow him to enter......This was afterwards illustrious "the Lafayette flight element" the embryonic form, their party chief was reedcard Si enlightens, a senior pilot, although 28 year-old a

因为一个共同的目标而聚集在一起的这38个人当中，每一个参军的原因都不一样：来自于德州的布雷恩·罗林斯是为了赎回抵压给银行的大农场；家在内布拉斯加州的威廉·延森，则是为了维护家族光荣的传统；布雷格斯·劳瑞为了逃避过于严厉的父亲；埃迪·比格是一个骄傲自大，无法坦然面对自己过去的人；尤金·斯金纳则是这里惟一的黑人，他的到来是为了"感恩"，因为法国不但允许他参加拳王争霸赛，还给予他最合理的待遇，而在美国，连公共场所都不允许他进入……这就是后来赫赫有名的"拉斐特飞行小队"的雏形，他们的队长则是里德·卡斯迪，一名资深的飞行员，虽然28岁的年纪不算大，却足以成为这群毛头小子中最稳重老成的一个。

Adjustable feature allows control of back pressure in system, reduces water hammer, and prevents siphoning.

可调节的特性使得阀门能够在系统内进行回压控制，减少水锤现象，并且防止虹吸现象的发生。

In pressure of influence underbalanced drilling,such as drilling fluid column pressure,annulus pressure,underbalance pressure,wellhead back pressure and formation pressure etc.,the formation pressure is basic pressure.Because all pressure calculations are built on the basic pressure.

认为在影响欠平衡钻井的钻井液静液柱压力、环空压耗、欠压值、井口回压、地层压力中，地层压力是首先要搞清楚的最基础的压力，最好先求出地层压力而不必急于进行欠平衡钻进，因为一切欠平衡的压力计算都是建立在这个基础压力之上的；再根据地层压力确定合理的欠压值，确定所用的钻井液密度。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。