New methods allow evaluating cement from floating rig
- Conoco Inc., Houston, TX (US)
Evaluating cement in subsea wells from a floating rig presents some unique problems that can be solved. Two of the most common problems are the microannulus effect and tool centering of cement bond logs (CBL). Subsea completions cannot readily be pressured up to eliminate the microannulus effect that can make cement-bond logs appear poor. There are methods to minimize the microannulus in subsea wells. Planning the cement evaluation from a floating rig must begin with selection of the subsea hanger. This paper describes three techniques for obtaining cement-bond logs from subsea wells. The techniques to minimize the microannulus effect can be either circulating and cooling the casing while cement sets, bumping the plug with sea water and displacing with weighted mud after the cement sets, or spotting heavy mud above the zones of interest. Each technique has advantages and disadvantages.
- OSTI ID:
- 6634339
- Journal Information:
- Oil Gas J.; (United States), Vol. 86:47
- Country of Publication:
- United States
- Language:
- English
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