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Encyclopedia > Pumpjack
A colourful nodding donkey in the United States
A colourful nodding donkey in the United States

A nodding donkey or pump jack is the overground drive for a submersible pump in a borehole. A colourful nodding donkey in the United States File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... A colourful nodding donkey in the United States File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... A submersible pump is a pump which has a hermetically sealed motor close-coupled to the pump body. ... Water borehole in northern Uganda A borehole is a deep and narrow shaft in the ground used for abstraction of fluid or gas reserves below the earths surface. ...


A nodding donkey or horsehead pump is usually driven by an electric motor and 'nods' at a regular rhythm. Depending on the size of the submersible pump, it produces 5 to 40 litres of petroleum-water mixture at each stroke. A 2 inch (50 mm) diameter metal rod connects the head to the pump, located underground in the oil reservoir. Electric motors of various sizes. ... Rhythm (Greek ρυθμός = tempo) is the variation of the duration of sounds or other events over time. ... A submersible is a type of underwater vessel with limited mobility, intended to remain in one place during use. ... Manual pump used to obtain water A pump is a mechanical device used to move liquids or gases. ... The litre (spelled litre in Commonwealth English and liter in American English) is a unit of capacity. ... Pumpjack pumping an oil well near Sarnia, Ontario Petroleum (from Greek petra – rock and elaion – oil or Latin oleum – oil ), crude oil, sometimes colloquially called black gold, is a thick, dark brown or greenish liquid. ... Water (from the Old English word wæter; c. ... An oil reservoir is a subsurface body of rock having sufficient porosity and permeability to store and transmit fluids. ...


The electric motor (or, more rarely, a natural gas or diesel engine ) turns a pair of cranks, which by their action raise and lower one end of the beam. The other end of the beam has a curved end, resulting in the shape likened to a donkey or horse's head. This totally converts the rotary mechanism of the motor to a vertical reciprocating motion to drive the pump shaft. This is what sets up the characteristic nodding motion. The engineering term for this type of mechanism is a walking beam. It was often employed in stationary and marine steam engine designs in the 1700s and 1800s. The diesel engine is a type of internal combustion engine; more specifically, it is a compression ignition engine, in which the fuel is ignited by being suddenly exposed to the high temperature and pressure of a compressed gas, rather than by a separate source of ignition, such as a spark... A steam engine is a heat engine that makes use of the thermal energy that exists in steam, converting it to mechanical work. ... Events and trends The Bonneville Slide blocks the Columbia River near the site of present-day Cascade Locks, Oregon with a land bridge 200 feet (60 m) high. ... Events and Trends Beginning of the Napoleonic Wars (1803 - 1815). ...


This system is also commonly referred to as a beam pump, rod pump, grasshopper, thirsty bird, pump jack, or jack pump. This type of arrangement is commonly used in onshore applications for relatively low-production oil wells. An oil well is a term for any perforation through the Earths surface designed to find and release both petroleum oil and gas hydrocarbons. ...

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Nodding donkey

 
 

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