Suitability of Amphoteric Ion Polymer as Retarder for Calcium Aluminate Phosphate Cement
- Huajie Liu (China University of Petroleum) | Yuhuan Bu (China University of Petroleum) | Leiju Tian (China University of Petroleum) | Chang Lu (University of Alberta)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- compressive strength, rheology, stability, calcium aluminate phosphate cement, free fluid, Amphoteric ion polymer, retarder
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- 43 since 2007
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One new type of amphoteric ion polymer is developed as the retarder for CAPC which is the most promising system for using as the oil well cement to resist acid corrosion. Results show that the retarding effect of amphoteric ion polymer is excellent. Although, the amphoteric ion polymer retarder could decrease the early compressive strength to some extent, it has little negative effect on the long term compressive strength of CAPC. And the basic properties of CAPC with amphoteric ion polymer still meet the demanding of well cementing.
In order to isolate the oil, gas and water formations to ensure the oil production and well repairing, it is necessary to conduct cementing in every oil and gas well (Mangadlao et al., 2015; Guo et al., 2014; Liu et al., 2016). And the basic physical and chemical properties of well cement play a decisive role in cementing quality (Liu et al., 2016; Hurnaus et al., 2016). With the assistance of additive and admixture, conventional oil well cement, which is one kind of Portland cement, could meet the most demands of oil and gas well cementing. For example, the mixture of oil well cement and silica sand could keep stability at above 250°C (Bu et al., 2016). However, Portland cement is not resistant to acid corrosion, and the corrosive media (e.g. CO2 and H2S) exists in many oil and gas wells (Yang et al., 2016; Omosebi et al., 2016; Zhang et al., 2014; Kutchko et al., 2011). Acid corrosion could induce the permeability of cement increase and the compressive strength decrease, therefore, the development of a new type of oil well cement with the ability of resisting acid corrosion is very necessary.
The calcium aluminate phosphate cement (CAPC) proposed by Sugama T. (Sugama et al., 2006) and Benge G. (Benge et al., 2006) is the most promising system for using as the oil well cement to resist acid corrosion. During the process of cementing, the cement slurry is pumped into the annular space between the casing and formation via the inner of casing to form cement sheath, therefore, the pumpability is the first key point to decide whether CAPC is suitable as well cement or not. However, the thickening time of CAPC is less than 10 min at about 80°C, which cannot meet the demands of the pumping operation.
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