Drilling team is evaluating options to safely & efficiently abandon ~1500m of 8-1/2" open hole.
One option is to use sacrificial drillstring, which will be cemented in place and release using Halliburton BHKA tool in order to save rig time instead of placing multiple balanced plugs. In summary this is disconnect tool that would release sacrificial drillstring below and is activated by a dart similar to SSR dart. Plan is to run ~1500m of 3-1/2" sacrificial drillpipe below, cement the sacrificial pipe in place and drop the dart with displacement fluid to release from the string once displacement is completed.
The Halliburton BHKA disconnect system is being considered and I would like to know if there has been any experience with this particular system or any other disconnect systems would be preferred.
Well has 30deg inclination at disconnect tool
String configuration will be as:
disconnect tool (BHKA)
3-1/2" NC38 sacrificial string of 1500m
Has anyone else ever used a disconnect system from sacrificial string for cement job ? How did that work? Any specific issues or lessons learned (such as not being able to disconnect, land the disconnect dart in time, etc.) ?
Successfully the single abandon cement plug for 8 ½” pilot hole with +/- 2800 ft length at +/- 65-75 Deg inclination using +/- 2800 ft of 3 ½”, 9.2 ppf, L-80, VAM21, C-75 used tubing string with BHKA disconnect tools.
The job completed within 1.6 days Vs 4 days plan for conventional abandon cement plug
The main advantages of using the single abandon cement plug with BHKA disconnect tools are as follow:
Blackhawk have developed a drillable version of the Stinger Disconnect Tool. And has been deployed successfully for a major independent operator offshore Mediterranean sea, plug depth 15,000ft.
Permanently abandon 2,500+ ft of 12-1/4" open hole and sidetrack for next casing section
Blackhawk’s Drillable Stinger Disconnect System was run with 5-1/2" fiberglass stinger pipe across the open hole interval.
A custom guide shoe was designed and run to allow the string to be set on bottom and rotated, without packing off, as secondary release option.
Drillable components of the system were disconnected 250 ft below casing shoe.
Cement was pumped behind the disconnect dart to place a second balanced plug 65 ft inside the previous casing shoe.
Successfully kicked off the next open hole section just below the shoe for successful abandonment and sidetrack in single cement pumping operation.
VALUE TO CUSTOMER
Customer successfully isolated and abandoned the open hole section and sidetracked the well, as planned.
Customer saved 4.5 days of rig time compared to previous campaigns where multiple plugs had to be pumped and tested.
We have looked at several tools some time ago and here is the summary of pros and cons of each. Based on analysis HB and TAM tools were recommended. We have not used any yet though.
Halliburton BHKA and TAM Hydraulic Release (HR) Tool