The Research of Polymer Film-Forming Plugging Agent for Drilling Fluid

Abstract

In order to improve the plugging and anti-collapse performance of water-based drilling fluid, a polymer film-forming plugging agent LWFD is synthesized by emulsion polymerization. The effect of the agent on rheology, API filtration loss, lubricity and film plugging of polymer drilling fluid and cationic drilling fluid is evaluated in laboratory. The experimental results show that the agent has little effect on the rheology and filtration loss of polymer drilling fluid and cationic drilling fluid, and can improve the lubricity of drilling fluid. The synthesized polymer film-forming plugging agent LWFD has good plugging properties for sand discs with different permeabilities, and the agent can effectively improve the film-forming plugging and temperature resistance of drilling fluid when combined with the inorganic nano-plugging agent NMFD. The high performance polymer drilling fluid formed by introducing polymer film-forming plugging agent LWFD and inorganic nano-plugging agent NMFD into polymer drilling fluid has comparable performance as Halliburton's SHALEDRIL high performance drilling fluid, which can meet the requirements of on-site drilling and has application value.

Synthesis of a hydrophobic associating polymer and its application in plugging spacer fluid

“…Drilling uid plugging is more commonly used in the process of plugging, but its plugging effect is likely to fail during casing running. [1][2][3][4] Spacer uid is a type of working uid that is injected into the well from the casing between drilling and cement slurry being injected. The spacer uid prevents cement contamination by ushing and displacing the drilling uid.…”