Systems / Off Shore / Gator Single Trip P&A System
This single trip system, consisting of a CX-2 Bridge Plug, Gator perforating tool and components, a drop ball circulation sub and a CXRTP was run in on 5 1/2" pipe into the 9 5/8" 53.5# casing. The CX-2 was set, released and pressure tested at 3,810 ft. The string was then picked up to 2,720 ft and the Gator tool was functioned to hydromechanically perforate, achieving 4 radial perforations, 90 degrees apart to ensure good radial coverage at and then again at the lower perforation area at 3,780 ft. The perforations have a large TFA and push out into the outer annulus, helping the centralise the casing for more effective annular cement displacement. The CX-RTP was then set at 3,760 ft and circulation was then confirmed through the perforations using the B annulus. After confirmation of the circulation path, the drop ball circulation sub was opened to isolate the Gator tool below and cement was pumped and squeezed into the perforated outer / B annulus.
- Trip the BHA to bottom (it may have a ball on seat or it might be just a rotational set bridge plug)
- Pressure up to start setting of the bridge plug or set plug by rotation Pressure test bridge plug.
- Move to first Gator Perforation Flow fluid down string to close VCV Continue to pressure up on Gator to shear (super shear) at approximately 3500 PSI make a cut at 4000 psi
- Equalize by squatting on ULS and move out of cuts, establish feed rate into cuts down annulus
- Move to upper perforation close VCV and make cut
- Equalize and move string, place packer between cuts and establish feed rate
- Once you have feed rate into both sets of perforations set packer between and circulate clean staying below VCV closing rate
- Once clean fluids back to surface drop ball for TBD or circulation sub and start with packer unset
- Set packer in position for cement job and cement (part of the B annulus) unset packer and pump balanced cement plug to stop u tubing
- POOH
Bottom hole assembly
- MECHANICAL PACKER
A compression set packer that can be used for testing feed rates
- BALL DROP SUB
Impact vibration and jetting used to break up and dislodge stubborn cement or barite during washing
- Unloader SUB
Equalization sub with ports to the A-annulus that close in tension and open in compression. Allows for equalization of the string and A-annulus after perforations are made.
- GATOR PERFORATOR
Tool allows for a surface indication to show the tool has made a full stroke by identifying cut pressure on both the standard four-bladed tool and the DPT.
More about the Gator Perforator → - Velocity Control Valve
A rate-activated valve that closes once the pre-determined activation rate is achieved. In this well it was set to close at 180 liters a minute.
- MEGA PACKER
expands to create the A B annulus cement supoprt barrier
More about the Mega Packer →
