The Performance Evaluation of Potassium Drilling Fluid System

Abstract:

The basic prescription of the potassium sulfate drilling fluid is: 5% bentonite ＋0.4％Na₂CO₃ ＋5.0％K₂SO₄ ＋1000ppmDCL ＋200ppmDesco ＋100ppmAlcome ＋500ppmSAP＋ 1000ppmLT ＋1000ppmKEL. The content of K+ is 50000mg/L. The drilling fluid has appropriate viscosity, gel and filter loss. The shale rolling recovery rate is bigger than 85%. The static swelling rate is smaller than 2%. The corn damage is less than 20%. The mechanism of protect formation is the K+ ability of preventing the clay from hydrating and swelling, the adsorption ability of formation protecting agent and the cooperating role of K+ and formation protecting agent. The potassium sulfate drilling fluid was used in fang-3 outer section of the Song-fang-tun oilfield. It was shown that the drilling fluid could meet the drilling demand in this oilfield.

• Periodical: Applied Mechanics and Materials (Volumes 423-426)
• Pages: 635-639
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.423-426.635
• Online since: September 2013
• Authors: Qing Wang Liu, Shou Song Zhang, Zhen Zhong Fan, Ji Gang Wang, Yan Min Lou
• Keywords: Corn Damage, Formation Protection, Potassium Sulfate Drilling Fluid, Song-Fang-Tun Oilfield

References

[1] Sui Jun. Drilling technology for low permeable reservoirs of Daqing peripheral oilfields[M]. Beijing: petroleum industry press, 2003, 23 to 28.

[2] Yu Hongjin. Daqing drilling technology progress[M] . Beijing: petroleum industry press, 2005, 245-253.

[3] Chen Taoping, Hu Jingbang. Petroleum engineering [M]. Beijing: petroleum industry press, 2004, 119-130.