Counterbalance

One of the most important aspects of torque loading on a gear reducer is the level of counterbalance. Technical Data used in the field explained in petroleum courses in Rawalpindi. Improper counterbalance, either too much or too little, is probably the biggest single factor involved in overloading a pumping unit gear reducer.

In general, the counterweights are positioned on the cranks so that their effect approximately balances out the weight of the sucker rod string and a portion of the fluid to be lifted.

In some special geometry units such as the Mark II, the counterbalance torque on the gear reducer is out of phase with the torque on the gear reducer exerted by the well load. This means that when the pitman side members go over top and bottom dead center with respect to the reducer slow speed shaft, the reducer torque exerted by the counterweights is either leading or lagging the well load torque. This is accomplished by putting a dogleg in the crank so that the counterweights do not go over top and bottom dead center of the reducer slow speed shaft at the same time as do the pitman side members. The net effect of this combination of torque loading is illustrated. Some more details of petroleum courses in rawalpindi are as under.

For any position of the cranks there is a number, when multiplied by the polished rod load, that equals the torque on the gear reducer caused by the well load. This number is called a “torque factor.” As the cranks are rotated through one complete stroke of the pumping unit, the torque factor changes for every crank position.

The pattern of torque factors around the pumping cycle is altered by the particular type geometry unit in question. This changing pattern of torque factors, in conjunction with phased counterbalance (see Counterbalance section), is used to an advantage in reducing the net torque on the gear reducer in some cases. Torque factors usually are expressed in inches. TSK Training for Skills and Knowledge is the best institute in Rawalpindi Islamabad for Pakistani Students who wants to join petroleum courses in islamabad.