柱塞

The wellhead part mainly includes the controlling device, the pneumatic valve, the blowout control box, the damping spring and the plunger catcher, and the downhole part consist of the combination tubing, the buffer spring, the tubing spider and the plunger which reciprocated between the tubing.

井口部分主要包括控制器、气动阀、防喷盒、减震弹簧、柱塞捕捉器；井下部分主要包括大小油管、缓冲弹簧、油管卡定器，以及在大小油管间往复运动的柱塞。

The numerical simution results show that there is slug flow in the plunger-cylinder of the annulus pipe,because of the existence of Casson yield stress.

数值研究结果表明，由于Casson屈服应力的作用，轴向同心环空内存在柱塞流动，柱塞的大小与Casson屈服应力成正比，与压力梯度成反比。

In accordance with the features of the plunger movement various stages characteristic parameter change situation.

根据柱塞举升的工艺特点分析了柱塞运动各阶段特性参数的变化情况

Elasticity plunger resume original dimension, the gap between plunger and pump barrel was increased downstroke.Leakage of sucker pump with automatic compensate gap was decreased and pump efficiency was increased upstroke, friction between plunger and pump barrel was reduced downstroke.

下冲程，弹性元件恢复原尺寸，柱塞与泵筒之间的间隙增大，从而实现上冲程减小泵漏失量，提高泵效，下冲程降低了柱塞与泵筒之间的摩阻。

The principal of buffer is described as follows.At impulsing down,the piston moves down and vacates the annular space.The pressure in respiratory cavity decreases to a certain level and the traveling valve opens.At that time,the liquids enter into traveling valve and cavity and the plunger is impulsed upward to carry out the gentle transient at the sudden change.When the upward impulsing begins,the respiratory cavity is subjected to pressure and the traveling valve closes.During the gradual pressure rising,the liquids in respiratory cavity effuse from the upper ventage and the sudden change of force-summing direction of plunger is relieved relying on the resistance of ventage.

其原理大致是：下冲程时，活塞向下运动，让出环形空间的体积，呼吸腔内压力下降，下降到一定水平后，游动阀打开，此时，游动阀和小孔同时进液，使柱塞在从上死点处突然改变方向向上运动时得到缓冲，实现了柔和过渡；当上冲程开始时，呼吸腔受压，游动阀关闭，在压力逐渐上升的过程中，呼吸腔内的液体从上部的小孔流出，并依靠小孔的阻力使柱塞受力突然换向得到缓冲。

The stopper (41) includes a distal portion (62) and a proximal portion (61) separated by a spring element (63) and configured to compress when fluid is being driven through the passageway by motion of the plunger (37) and to continue to drive fluid through the passageway after motion of the plunger (37) has stopped.

止动器(41)包括由弹簧元件(63)分离的远侧部分(62)和近侧部分(61)，并设置成当流体通过柱塞(37)的运动而通过通道排出时进行压缩，且在柱塞(37)的运动停止后继续推动流体通过通道。

At present, the use of domestic oil well pump rod to account for a large proportion of the number, most of which are plunger-type pump, conventional plunger pump's oil production has become one of the main.

目前国内油田使用有杆泵的井数以占很大比例，其中大部分是柱塞式抽油泵，常规柱塞抽油泵已成为主要的采油方式之一。

In view of the problem of high friction, high leakage and short life existing in conventional plunger pumps, this article presents a new hydraulic feedback and self-sealing plunger pump.

针对目前采用的柱塞泵摩阻大、漏失大、寿命短等问题，提出了一种新型液压反馈高效节能自封柱塞泵。

In order to do research on pipe flow and pump characteristics of polymer flooding and water flooding rod-pumped well in especially high water-cut stage, rheometric test aimed at production stream from polymer flooding and water flooding rod-pumped well in especially high water-cut stage has been made, and the characteristic of production stream in especially high water-cut stage is confirmed as Newtonian fluid. Experiments using different mediums about pipe flow and pump characteristics is made. Frictional resistance and coefficient of friction resistance of annulus fluid between sucker rod and the pipe flow is calculated under different working conditions. Frictional resistance between plunger and pump barrel under different parameters is calculated based on related theory of pump characteristic and the strained analytical model of oil-well pump. Besides, using the theory of slit flow and hydraulic -clamping pressure, the frictional resistance is calculated, and the error between the result and measured value is no more than 13%.

为研究特高含水期水驱及聚驱抽油机井管流特性与泵特性，本文针对特高含水期水驱及聚驱井采出液进行了流变性试验，确定了特高含水期油井采出液的性质属牛顿流体；利用不同介质，进行管流特性与泵特性试验，得到了不同工况下杆、管环空流的摩擦阻力和摩阻系数；根据泵特性相关理论和抽油泵受力分析模型，计算了不同参数下柱塞与泵筒间的摩擦阻力，并利用缝隙流与液压卡紧力理论对柱塞与泵筒间的摩擦阻力进行了计算，计算结果与实测值误差在13%以内。

An adjustable pipette (10) includes a body (12) containing a plunger assembly (14) including a thumb button (22) that is axially moved in alternating relatively shorter sample aspirating and relatively longer dispensing strokes.

一种可调节吸管(10)，包括本体(12)，该本体装有一柱塞组件(14)，该柱塞组件(14)包括一拇指按钮(22)，该拇指按钮(22)可在交替改变的相对较短的试样吸取冲程和相对较长的试样分配冲程中轴向运动。

Certain types of sockets are ''connectionless'', most commonly

某些类型的套接字是无连接的，大多数是UDP协议。

Take it in to his nibs yourself .

你自己拿进去给头儿吧。