I'm looking for opinions on the different methods to refrac underperforming wells in the Bakken. Each well must be considered individually so I'll give you some details on the current well I'm looking at.
[ul]
[li]Drilled and completed in '08[/li]
[li]Landed in the Three Forks[/li]
[li]In some of the best acreage in the Bakken (nearby wells have EUR's with ~100,000-200,000 bbls more)[/li]
[li]Short lateral in 640 spacing (~10,000' down with ~5,000' lateral)[/li]
[li]7" casing in vertical with 4.5" liner from 9,300' to the end of the curve ~10,500'[/li]
[li]Lateral is open hole[/li]
[li]Bull head frac (the good ole' pump & pray)[/li]
[li]Used sand for proppant[/li]
[/ul]
It's still pumping out a decent amount of oil every day but in my opinion, this well has a lot of potential for missed pay. The poor and now outdated method used to stimulate it, along with the expected production from wells in this area make it a top candidate on my refrac list. The methods I've considered are:
[ol 1]
[li]SurgiFrac. It's Halliburton's coil tubing stimulation that doesn't require plugs or packers to stimulate isolated zones. They basically pump clean rate down the backside and proppant/stim fluid down the coil tubing. Sounds great, but it's pricey and I have some reservations on its ability to seal off zones in an open hole[/li]
[li]Attempt to pull the liner in the curve, ream out the lateral, run jewelry in the hole and frac it conventionally. Could work, but it's pricey, and there's a possibility I won't be able to vibrate that liner loose.[/li]
[li]Set a whipstock, kickoff, drill a new lateral, run jewelry in the hole and frac it conventionally. It's the priciest of all options, would likely have the best results, but I'm not sure by what margin. How much will the current lateral affect the frac'ing of the new lateral right next to it? I'm not considering moving up to the Middle Bakken since that would affect future infill programs. [/li]
[li]Another bullhead frac basically. Pump a pad, followed by about 10 stages of proppant with slickwater sweeps. If pressure flat lines, keep increasing sand weight till I more or less screen out on that fracture and something else breaks. It's the cheapest method by far, doesn't require large workover operations before stimulating, and it's quick/easy. Not sure about the return, since I wouldn't be isolating any zones.[/li]
[/ol]
Any insight from someone with experience in refracs (succesful or not), or a push in the right direction would be much appreciated.
[ul]
[li]Drilled and completed in '08[/li]
[li]Landed in the Three Forks[/li]
[li]In some of the best acreage in the Bakken (nearby wells have EUR's with ~100,000-200,000 bbls more)[/li]
[li]Short lateral in 640 spacing (~10,000' down with ~5,000' lateral)[/li]
[li]7" casing in vertical with 4.5" liner from 9,300' to the end of the curve ~10,500'[/li]
[li]Lateral is open hole[/li]
[li]Bull head frac (the good ole' pump & pray)[/li]
[li]Used sand for proppant[/li]
[/ul]
It's still pumping out a decent amount of oil every day but in my opinion, this well has a lot of potential for missed pay. The poor and now outdated method used to stimulate it, along with the expected production from wells in this area make it a top candidate on my refrac list. The methods I've considered are:
[ol 1]
[li]SurgiFrac. It's Halliburton's coil tubing stimulation that doesn't require plugs or packers to stimulate isolated zones. They basically pump clean rate down the backside and proppant/stim fluid down the coil tubing. Sounds great, but it's pricey and I have some reservations on its ability to seal off zones in an open hole[/li]
[li]Attempt to pull the liner in the curve, ream out the lateral, run jewelry in the hole and frac it conventionally. Could work, but it's pricey, and there's a possibility I won't be able to vibrate that liner loose.[/li]
[li]Set a whipstock, kickoff, drill a new lateral, run jewelry in the hole and frac it conventionally. It's the priciest of all options, would likely have the best results, but I'm not sure by what margin. How much will the current lateral affect the frac'ing of the new lateral right next to it? I'm not considering moving up to the Middle Bakken since that would affect future infill programs. [/li]
[li]Another bullhead frac basically. Pump a pad, followed by about 10 stages of proppant with slickwater sweeps. If pressure flat lines, keep increasing sand weight till I more or less screen out on that fracture and something else breaks. It's the cheapest method by far, doesn't require large workover operations before stimulating, and it's quick/easy. Not sure about the return, since I wouldn't be isolating any zones.[/li]
[/ol]
Any insight from someone with experience in refracs (succesful or not), or a push in the right direction would be much appreciated.
