1. Research Institute of Petroleum Industry, Tehran, Iran
2. School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
3. Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
联系作者简介:NIK Mohammad Amin Sharif(1990-),男,伊朗人,硕士,伊朗石油工业研究院研究员,主要从事钻井液、岩石力学、地质力学等方面的研究工作。地址:School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran。E-mail: m.sharifnik@ut.ac.ir
第一作者简介:NASIRI Alireza(1969-),男,伊朗人,博士,伊朗石油工业研究院研发主任,主要从事钻井、固井及地质力学等方面的研究工作。地址:Research Institute of Petroleum Industry, Tehran, Iran。E-mail:nasiriar@yahoo.com
Influence of monoethanolamine on thermal stability of starch in water based drilling fluid system
NASIRI Alireza1, NIK Mohammad Amin Sharif2, HEIDARI Hamidreza3, VALIZADEH Majid1, NIK Mohammad Amin Sharif2, HEIDARI Hamidreza3, VALIZADEH Majid1
1. Research Institute of Petroleum Industry, Tehran, Iran
2. School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
3. Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran
Abstract
To improve the thermal stability of starch in water-based drilling fluid, monoethanolamine (MEA) was added, and the effect was investigated by laboratory experiment. The experimental results show that the addition of monoethanolamine (MEA) increases the apparent viscosity, plastic viscosity, dynamic shear force, and static shear force of the drilling fluid, and reduces the filtration rate of drilling fluid and thickness of mud cake apparently. By creating hydrogen bonds with starch polymer, the monoethanolamine can prevent hydrolysis of starch at high temperature. Starch, as a natural polymer, is able to improve the rheological properties and reduce filtration of drilling fluid, but it works only below 121 ℃. The MEA will increase the thermal stability of starch up to 160 ℃. There is a optimum concentration of MEA, when higher than this concentration, its effect declines.
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Sepiolite nanoparticles were added to the bentonite-based drilling mud to control its properties, and the effects of sepiolite nanoparticles on rheological properties and filtration loss of the bentonite-based drilling mud at different temperature and pressure conditions were studied by experiments. For the bentonite-based drilling muds with and without sepiolite nanoparticles, plastic viscosity, yield point, and fluid loss were measured at different temperature and pressure conditions, the core flooding experiments were also conducted at reservoir pressure and temperatures, and fluid loss and formation damage were measured. The results show that: sepiolite nanoparticles can be used to improve the plastic viscosity and yield point of saline and fresh bentonite-based drilling mud; the bentonite-based drilling mud with sepiolite nanoparticles shows a great stability of rheological properties over a wide range of temperature and pressure, especially at high temperatures and pressures; sepiolite nanoparticles reduce the fluid loss and the permeability reduction at reservoir pressure and temperatures. Sepiolite nanoparticles are an ideal additive for bentonite-based drilling mud.