Funct. Mater. 2022; 29 (1): 164-171.


Preparation and performance evaluation of modified starch as filtrate reducer for drilling fluid

Zeng Jia1, Cheng Huijun2, Yang Xue1

1Jingzhou University, Jingzhou 434020, Hubei, China
2Hubei Special Equipment Inspection and Testing Institute Jingzhou Branch, Jingzhou 434000,Hubei, China


In the process of drilling fractured reservoirs, drilling fluid can easily leak into the deep fractures but also block fracture channels. Because it has no self-degradation properties, the production capacity of oil fields will be seriously affected in the later exploitation process. Based on the grafting copolymerization, a series of high temperature filtrate reducers with low viscosity were prepared by using corn starch, 2-acrylamide-2-methylpropyl sulfonic acid (AMPS), methyl acryloxyethyl trimethylammonium chloride (DMC) and N-vinyl pyrrolidone (NVP) as raw materials. Experimental results showed that the thermal stability of starch was improved by grafting thermal resistance groups such as heterocyclic ring and sulfonic acid. The key treatment agents such as filtrate reducer, viscosifer and liquid weighting material were combined to prepare a solid-free drilling fluid which was stable at temperature up to 170°C. The thermal stability of the drilling fluid was controlled by adding filtrate reducer, antioxidant and monoethanolamine (MEA) to meet drilling requirements on-site. Moreover, the drilling fluid can degrade automatically within 10 days and its direct flowback permeability recovery rate was over 98%, indicating that it had excellent reservoir protection performance and met drilling requirements.

modified starch, temperature resistance, filtrate reducer, drilling fluid, reservoir protection.
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