Mechanism of High-Carbon Paraffin Deposition and Preventing Methods

Abstract:

The high-carbon paraffin in crude oil will deposit at a very high temperature, which disturbs oil production seriously, so the prevention and control of high-carbon paraffin becomes an important task. Because of the characteristic of high-carbon paraffin, the conventional wax removal and inhibition only plays a small part. Components and structure of the crude oil from Shengli, Tuha, and Kazakhstan PKKR are analyzed by methods of GC, 1H-NMR and so on; It is proved that the main reasons why high-carbon paraffin deposition is serious are low content of asphaltene and resin, high gas to oil ratio, and high-carbon paraffin contained in the crude. The paraffin inhibition mechanism is researched by microscope and contact angle instrument. It is found that the paraffin inhibitor can prevent paraffin crystal from forming 3D network structure by modifying its structure, and mitigate paraffin deposition by changing the wettability of paraffin deposition surface. At last, both paraffin inhibition effect and evaluation method are referred. The paraffin inhibiting rate for the crude oil with high-carbon paraffin is above 60%.

• Periodical: Advanced Materials Research (Volumes 396-398)
• Pages: 1102-1105
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.396-398.1102
• Online since: November 2011
• Authors: Fu Sheng Zhang, Jian Ouyang, De Wei Wang, Xin Fang Feng
• Keywords: High-Carbon Paraffin, Paraffin Crystals Structure, Paraffin Inhibiting, Wettability

References

[1] B. Wang. "Paraffin deposit on well wall, paraffin remover and paraffin inhibitor". Speciality Petrochemicals, No.6, pp.64-71, 1994.

[2] F. Chen, J.M. Qu, F.X. Wang, et al. "The recent study and development of paraffin remover and inhibitor in oil well". Chemical Engineering of Oil and Gas, Vol.32, No.4, pp.243-245, 2003.

[3] L.J. Dong, B. Wang. "Systematical analysis of paraffin deposit and discussion on mechanism of paraffin deposition in production well of Tulufan-Hami oilfield in Xingjiang". Oilfield Chemistry, Vol.12, No.2, pp.113-116, 1995.

[4] H. Zang, B.X. Shen. "Effect of wax crystal morphology on the pour point decline of crude oil". Acta Petrolei Sinica (Petroleum Processing Section), Vol. 22, No.5, pp.74-79, 2006.