Integrated Optimization of SIMOPS (Drilling, Well Intervention, and Production) on Jackup Rig : a Case Study of Under Cantilever Operations at X-1 Platform in Mahakam Asset

Abstract

Deliverability of a field shall be reflected through its hydrocarbon production. In offshore fields, the backbone for stability of production comes from drilling and well intervention operations. One makes new wells while the other maintains existing wells to minimize impact of the decline. Nevertheless, these operations may become a double-edge sword for production. For example, rig activities that shut in existing wells in an offshore platform create production loss of that field. This situation may be ludicrous, but it is a dire consequence for mature/sensitive wells, in which potential loss might be proportional to shut in duration required. This ironic situation prompts two (2) challenges which are to maintain production existing wells and to start production of new wells while respecting the safety aspect in operation. Thus, in order to overcome these challenges, an integrated optimization of SIMOPS between drilling, well intervention and production is ushered in X-1 drilling campaign where production activities continue and well intervention operates under cantilever of the jackup rig during the whole drilling campaign.PT Pertamina Hulu Mahakam (PHM) delivers one well in offshore area between 17-25 days in average, depending on the well type. As a continuous saving initiative process, every possible scenario was exercise to optimize cost and three (3) objectives were identified for cost optimization which are to reduce the shortfall of existing wells by re-perforation to revive well, optimize rig duration at respective wells safely through offline well intervention activities and accelerate the production of new wells. As a result, all three (3) objectives had been achieved during the complex campaign with deliverability including no LTI during operation, three (3) new wells , two (2) workover and sidetracked wells with longer open hole record at X-1, offline well intervention activities (perforation) of existing well at X-1, offline production activities to revive existing wells at X-1 through offload to atmosphere and offline well connection activities for new wells (earlier). In the final analysis, integrated SIMOPS optimization generates production gain and enhances cost effectiveness safely. This paper shall provide the methodology to design and prepare an integrated SIMOPS as well as the corresponding result and lesson learnt.