Pumping Unit Loading

There are many variables that affect the loading on the sucker rod string and pumping unit. Some of these variables are listed. Technical Data used in the field explained in petroleum courses in Rawalpindi. Unfortunately, many of these variables are unknown when design calculations for sizing a pumping unit are made. For a visual representation of some of these loads.

A dynamometer card is a continuous plot of polished rod load vs. polished rod displacement, or it may be a continuous plot of polished rod load vs. time. A polished rod load plot can in some instances be useful in analyzing downhole problems as well as identifying the resulting loads on the surface equipment.

A typical dynamometer card, When pumping speed is elevated above zero, the card takes on a different shape. Some of the load values are  increased over the zero-pumping-speed card shown by the dotted lines and some values are decreased. Some more details of petroleum courses in Rawalpindi are as under.

While this section is not intended as a treatise on polished rod dynamometer card interpretation, certain conclusions can be drawn from the card and knowledge of subsurface conditions.

As noted under Pumping Unit Loading there are many variables that affect loading on the polished rod. Sometimes some of these variables nullify each other, sometimes they are additive, and sometimes they are shifted time-wise because of rod string dynamics, making it virtually impossible to make a meaningful interpretation of the dynamometer card shape. This is particularly true in deep wells with a relatively elastic sucker rod string. At other times, certain type cards have a very distinctive pattern and downhole problems can be identified quite easily.

Dynamometer card that is particularly detrimental to all surface and subsurface equipment. This card depicts a severe fluid pound. The condition generally is caused by attempting to produce fluid at a greater rate than the reservoir will give it up. The result is incomplete pump fillage and a fluid pound when the plunger hits the fluid on the downstroke. If the pound occurs very near the top of the pumping unit stroke, or at a low plunger speed, the effect is not so damaging; however, if the pound occurs at high plunger speeds in the pumping cycle, a progressively detrimental effect and equipment damage is generally the result. If a fluid pound does exist, the operator should make every effort to correct this costly practice by decreasing the displacement of the bottom hole pump. This can be accomplished by either reducing the pumping speed, shortening the stroke length, or installing a smaller-bore bottom hole pump. Sometimes it is  necessary to try a combination of these remedies to prevent a decrease in production. TSK Training for Skills and Knowledge is the best institute in Rawalpindi Islamabad for Pakistani Students who wants to join oil field after petroleum courses in Rawalpindi petroleum courses in Islamabad.