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A.6.4 Model Results for Reworked Wells Drilling Technology and Costs A.6.4.1 Rigondrilling/deepening460m(1,500ft)/rigstillonthewell A.6.4.2 Rigondrilling/sidetrackedlateral/asaplannedpartofthewelldesign A.6.4.3 Reworks/righastobemobilized/addalateralforproductionmaintenance/aworkover The cost increment for drilling an additional 460 m (1,500 ft) is $375,000 (5,000 m well). This is a simple extension of the final interval, using the same ROP/hrs performance numbers and addition length to the perforated liner. The rig is over the hole, so there is no mobilization charge. Procuring and having the extra length of perforated liner would not be a significant planning issue. A.6.4.4 Redrillstoenhanceproduction/aworkover/rigtobemobilized To sidetrack the well as a planned part of the well, the kickoff point would be 645 m (2,120 ft) above the last casing point of 4,000 m (13,120 ft for a 5,000 m /16,400 ft well) at 3,355 m (11,000 ft). With a build rate of 3°/100 ft of measured depth, 305 m (1,000 ft) of drilling would set the angle at 30 degrees. Drilling another 1,145 m (3,754 ft) would be the middle of the 1,000 m (3,280 ft) hot zone. Drilling would proceed to a total measured depth of 5,380 m (17,648 ft). The sidetracked lateral would have penetrated completely through the hot zone. The Total Vertical Depth at the 5,380 m (17,648 ft) measured depth would be 5,000 m (16,400 ft). The horizontal departure would be 650 m (2,132 ft). The planned lateral will be used to develop a second production (or injection) leg to the well. Using the 5,0004 model without the sidetrack was $6,989,859, which took 1,960 hours in 82 days. The total well cost with the additional sidetracked interval would cost $8,972,859, done in 2,827 hours in 118 days. This is an additional cost of $1,983,000 and 36 days. A well recompletion, which requires a lateral to restore production flow or temperature, would then require an additional $400,000 for mobilization/demobilization, blowout preventer equipment (BOPE) rental, and setup. Due to the depth, the rig would need to be of a similar size and specification. The configuration of the well would be the same as the sidetracked lateral noted above. There would be an additional cost of $90,000 for a bridge plug and cement. The whipstock is covered in the above cost model. The total for the lateral, as a remedial operation, would cost $2,473,000 and take approximately 40 days. It is assumed that the formations being drilled are mostly crystalline. To deepen a 5,000 m (16,400 ft) well by 1,500 ft to 17,900 ft, which requires the mobilization of a rig, is considerably more expensive. There will be a cost of $500,000 for mobilization/demobilization, BOPE rental, and setup. The total cost of the deepening by 457 m (1,500 ft) would be $900,000. Chapter 6 The least expensive rework will be to extend the depth of the well while the rig is still mobilized over the hole, and before the perforated liner has been run in the shorter interval. A planned multilateral would mean sidetracking out of the well from a zone shallower than the original leg of the well. If it is necessary to sidetrack from a shallower point in search of promising fractures, then the cost to cement, pull back, and sidetrack the well will be more significant. This effort is a remedial operation to enhance the production. This cost would be similar to a multilateral additional cost. The rig on reworks and remedial operations will be costestimated for the 5,000 m (16,400 ft) wells using the 4 and 5interval models. 651PDF Image | Drilling Technology and Costs
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