Winarto W, Kamid A, Ramadhan A. Perhitungan Efisiensi Hydraulic Pumping Unit (HPU) pada Sumur yang Menggunakan Working Barrel Tipe Tubing Heavy Wall Barrel Mechanical PT. Pertamina Ep Cepu Regional 4 Zona 11 Cepu Field. RRJ [Internet]. 2025Mar.29 [cited 2025Apr.24];7(3):2217-29. Available from: https://jurnal.ranahresearch.com/index.php/R2J/article/view/1612