HCl/HF acid-resistant cement blend; Model study and field application
- Arco Alaska Inc., Prudhoe Bay, AK (US)
- Arco Oil and Gas, Plano, TX (US)
- Shell Western E and P, Inc. (US)
Analysis of Prudhoe Bay field stimulation data suggests that HF-acid treatments are harmful to wellbore cement. Laboratory tests confirmed the suspected solubility of conventional oilfield cements in hot-acid solutions. Test results indicate that a 2-in. cement cube is up to 96% soluble in a dynamic solution of 12% HCl/l3% HF (mud) acid at 190{degrees}F. A wellbore simulator was developed to correlate cube solubilities to downhole conditions. This paper documents equipment and testing procedures used to confirm acid solubility of cement-squeezed perforations in a typical wellbore. It also documents additive screening that led to the development of an acid-resistant cement (ARC) blend that uses liquid latex. This blend improved acid resistance by more that 700% over conventional formulations under simulated field conditions and configuration. The latex cement blend was also demonstrated to be compatible with coiled-tubing-unit cement-squeeze applications.
- OSTI ID:
- 6027124
- Journal Information:
- Journal of Petroleum Technology; (USA), Journal Name: Journal of Petroleum Technology; (USA) Vol. 43:2; ISSN JPTJA; ISSN 0022-3522
- Country of Publication:
- United States
- Language:
- English
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