A 160-173-54 pumping unit runs at 16 SPM producing 179 BOPD and 21 BWPD out of 2 inch anchored tubing. The 7/6 rods ...counterweight required?
Counterbalance problems are meat & potatoes on exams. Why? No fancy charts are needed like most rod pump problems. This can be solved using just two pages in the Guidebook and on the EBT any equations/data not found in the provided reference are easy to give for the specific problem. Now that's not saying there isn't plenty of room for error. I make mistakes on these problems all the time. For this one:
1) 7/6 1.5” rods; Wr = 1.833 lb/ft (7 PRD 10)
2) W = 1.833(5,000) = 9,165 lbs
3) Wfr = W(1-0.128G) = 9,165(1-(0.128*0.9)) = 8,109 (7 PRD 9)
4) Fo=0.34*0.9*1.5^2*4500 = 3098
5) CBE = 1.06(8,109 + (0.5*3,098)) = 10,238 (C).
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