Study on a Special Association Polymer Gel Applied in Vicious Lost Circulation in Crushed Zones

Abstract:

Vicious or severe loss mainly refers to total or complete lost circulation which occurs in fractured or cavity formation and requires repeated particulate materials or cementing slurry sealing，which is a major technical problem accompanied by drilling engineering. The special gel is an association polymer with good rheology property designed to cure severe lost circulation, which can form a type of reversible supramolecular structure(dynamic physical molecular network, rather than chemical cross-linking) by the intermolecular force of supramolecular. The gel has good shear-thinning property which can provide the gel be pumped and flow in pipes easily and flow with high viscosity and resistance in the zone porous. And the gel has visible viscoelasticity that the gel have high displacement efficiency to cut off the connection between the formation fluid and the drilling fluid in borehole. And the gel is hard to be diluted by formation fluids for its apparent viscosity and strong cohesive force. Therefore, the gel is potential to control severe lost circulation accompanying with water zones or overflow and loss coexist. In field application, the gel was successful to deal with several severe loss complexities in Sichuan and Changqin oil fields in China.

• Periodical: Advanced Materials Research (Volumes 518-523)
• Pages: 102-107
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.518-523.102
• Online since: May 2012
• Authors: Ping Quan Wang, Xun Yong Nie, Xin Min Zhang, Ping Ya Luo, Yang Bai
• Keywords: Anti-Diluting, Association Polymer, Lost Circulation Shear-Thinning Property, Plugging Application, Viscoelasticity, Yield Point

References

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