High-temperature-resistant filtrate reducer and preparation method thereof

Abstract

The invention belongs to the technical field of drilling fluid additives, and provides a high-temperature-resistant filtrate reducer and a preparation method thereof. According to the preparation raw material sodium p-styrenesulfonate monomer of the high-temperature-resistant filtrate reducer, filtrate reducer molecules can have rigid large side groups, the steric hindrance of the filtrate reducer molecules is large, under the high-temperature condition, the molecular flexibility can be reduced, then molecular thermal motion is reduced, and finally the high-temperature-resistant performance of the filtrate reducer is improved. Compared with gamma-(methacryloyloxy) propyl trimethoxy silane and a gamma-(acrylamido) propyl triethoxy silane coupling agent, the vinyl trimethoxy silane disclosed by the invention is low in cost, and the preparation cost of the high-temperature-resistant filtrate reducer can be reduced. Besides, the vinyltrimethoxysilane is connected with the main chain of the filtrate reducer through a carbon-carbon bond, so that the defect that amide groups between other silane coupling agents and the main chain of the filtrate reducer are easy to decompose at high temperature is overcome, and the high-temperature resistance of the filtrate reducer is improved.

Description

technical field [0001] The invention relates to the technical field of drilling fluid additives, in particular to a high temperature resistant fluid loss reducer and a preparation method thereof. Background technique [0002] With the gradual development of oil and gas resources in high-temperature deep wells and complex wells, challenges are posed to drilling fluid technology. The performance of drilling fluid will deteriorate at high temperature, such as the decrease of viscosity, the deterioration of wall-building performance and the increase of filtration. The deterioration of the above-mentioned performance of drilling fluid may easily cause drilling safety accidents. The fluid loss reducer used in drilling fluid has a great influence on the wall-building performance and fluid loss of drilling fluid, especially under high temperature conditions. Therefore, the high temperature resistance performance of fluid loss control agent plays a decisive role in the performance o...

AI Technical Summary

Problems solved by technology

However, the force between the polymer fluid loss control agent and the clay particles (action force including hydrogen bond, electrostatic attraction) is small, and it is easy to desorb under high temperature conditions.

[0004] Existing technology (Luo Xiao et al., Preparation and performance research of heat-resistant and salt-resistant organosilicon fluid loss reducer, new chemical materials, 2017 No. 8: 122-124) using γ-(methacryloyloxy)propyl trimethyl Oxysilane was used as a modifier to synthesize a silicone copolymer fluid loss control agent (PKANS) containing ester groups, but the stability of ester groups is easily affected by high temperature and does not have high temperature resistance

Prior art (Chu Qi, Synthesis and Action Mechanism Research of Anti-high Temperature Silicone Fluid Loss Agent, Fine Petrochemical Industry, 2012, 29(3): 35-39) and the Chinese patent with publication number CN102174314A all use γ-( Acrylamido) propyl triethoxysilane is used as a modifier to synthesize a silicone fluid loss control agent, which can withstand high temperatures of 200°C; however, γ-(acrylamide) propyl triethoxysilane is more The cost of the combination is high

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