Research and Performance Evaluation of Polyol Based Drilling Fluid

Abstract

Aiming at the technical problems such as mudstone wellbore stability, low permeability reservoir protection and environmental protection requirements in deep drilling, a new polyol based drilling fluid using polyol as the main mobile phase of drilling fluid is studied and developed, which can be compatible with most water based drilling fluid treatment agents, and has excellent temperature resistance, inhibition and reservoir protection performance, At the same time, because the polyol has the characteristics of high flash point, low toxicity and easy degradation, it can meet the application requirements in environmentally sensitive areas. The self developed polyol based drilling fluid is compatible with water based drilling fluid treatment agent, which has greater cost advantage compared with oil based drilling fluid treatment agent. The self developed polyol based drilling fluid with the formula of foundation mud (2.5% bentonite + 48.75% Polyethylene glycol B + 48.75% Water) + 0.2% xanthan gum (XC) + 3% anti temperature and fluid loss agent C + 3% anti temperature and anti sloughing agent (FT-3000) +1.5% liquid lubricant +0.15% sodium carbonate has good temperature resistance, inhibition and reservoir protection performance, and can meet the requirements of well wall stability of deep shale and low permeability reservoir protection. Compared with the water based KCl high temperature resistant drilling fluid being used in Jidong Oilfield, the self developed compound alcohol based drilling fluid has greatly improved in high temperature and high pressure rheology, shale inhibition and reservoir protection.

Copyright 2022, IFEDC Organizing Committee

This paper was prepared for presentation at the 2022 International Field Exploration and Development Conference in Xi’an, China, 16-18 November 2022.

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