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Oilfield Technology
presents an overview of some of the recent
developments in completions technologies and services that are available to
the upstream oil and gas industry.
COMPLETIONS
REVIEW
AceOil Tools
AceOil Tools has redesigned the traditional stop collar to provide
substantial holding force for operators looking to centralise the pipe
and protect equipment downhole. All of the company’s products
build on its ‘ratcheting’ mechanism.
The Ace Ratchet Collar (ARC) locks together to deliver a
holding force equivalent to over 90 000 lb. Its slimdesignmakes
it suitable for close-tolerance applications. This is important
for passing tight restrictions and effectivelymanaging surge
and swab. Such a design allows for faster running speeds, even
in formations with narrowmudmargins, resulting inminimal
impression on the pipe. In addition, with no loose parts, the ARC
removes the need for centraliser subs. This results in cost savings
of up to 80%.
Casestudy: Senegal
A stop collar with a slimdesignwas required to be installed
on 11¾ in. casing, passing through a drift restriction of 12¼ in.,
and had to provide a sufficient holding force under all operating
conditions.
40 ARCs and 20 centraliserswere installed offline at the pipe
yard, on 10 joints. The pipewas sent to the rig, then run down to a
total depth (TD) of 2776m. The casing annuluswas circulated clean
and cement was pumped. Centralisermovement was prevented
while the ARCwas running in hole. The cost savings achievedwere
betweenUS$80 000 – US$150 000.
Casestudy:GulfofMexico
A 9 7/8 in. casing stringwas needed to run through a 13 3/8 in. casing
and a 11 7/8 in. liner. A slimstop collar was required to prevent the
case accessories fromslipping and collecting above the liner during
run-in. Holding the centralisers in placewhile cementing took place
was also paramount to delivering the calculated stand-off.
30 ARCs and centraliserswere installed offline in advance.
The liner was shipped to the rig, then run in the hole through both
the parent casing and the 11 7/8 in. liner to a TDof over 4300m
and 20˚ inclination. The casing annuluswas circulated clean and
cement was pumped. Thiswas the first installation for this client
and the first for Ace in the region. The company has since provided
installations on two strings for the next well.
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