Floating junk bonnet protects liner top from debris
- Nodeco Ltd., Aberdeen (United Kingdom)
- Enterprise Oil Plc., Aberdeen (United Kingdom)
A new design of debris protection system, the floating junk bonnet, for liner tops prevents well debris from entering the liner top polished bore receptacle (PBR) and sticking the setting tools. The floating junk bonnet improves the recovery of liner setting tools from the well no matter how severe the debris problem is. Well debris (formation cuttings, fines, mud solids, cement solids, foreign bodies, etc) entering the linear top PBR during cementing operations has been a serious problem for many operators. In some cases, this problem has led to liner hanger setting tools sticking in the liner top PBR. The setting tool could then become cemented in place, resulting in an expensive fishing job or sidetrack. A prototype debris protection system was developed and tested prior to offshore application. The liner protection tool was subsequently successfully used on Nelson project development wells in the U.K. North Sea. The paper discusses debris accumulation, the junket basket, the floating junk bonnet design, test procedures, and field test results.
- OSTI ID:
- 6947896
- Journal Information:
- Oil and Gas Journal; (United States), Vol. 92:37; ISSN 0030-1388
- Country of Publication:
- United States
- Language:
- English
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