Preparation method of high-temperature-resistant binary copolymerized low-molecular-weight polyamine inhibitor for water-based drilling fluid

Abstract

The invention relates to a preparation method of a high-temperature-resistant binary copolymerized low-molecular-weight polyamine inhibitor for water-based drilling fluid. The problem that an existinginhibitor is poor in temperature resistance and stability is mainly solved. The preparation method of the inhibitor comprises the following steps: performing multi-step reaction on a monomer A and amonomer N-vinyl pyrrolidone according to a molar ratio of (1: 2)-(1: 10) through a catalytic hydrogenation method under the action of metal catalysts such as sodium borohydride and Raney nickel, and synthesizing the low-molecular-weight polymer inhibitor in an aqueous solution polymerization manner. The low-molecular-weight polyamine inhibitor for the water-based drilling fluid is higher in temperature resistance and stability, the inhibition effect of the water-based drilling fluid on a shale stratum can be improved, the well wall stability is improved, underground complexity is reduced, andprogress of the water-based drilling fluid technology and smooth oil-gas exploration are promoted.

Description

Technical field: [0001] The invention relates to the technical field of synthesis and preparation of water-soluble organic polymers for petroleum drilling, in particular to a method for preparing a high-temperature-resistant binary copolymerization low-molecular-weight polyamine inhibitor for water-based drilling fluid. Background technique: [0002] Wellbore instability in shale formations is a technical problem often encountered in drilling engineering, which causes at least US$600 million in losses to the world oil industry every year, and consumes about 5% to 6% of the total drilling time. Statistics show that shale formations account for 70% of the total formations drilled, and more than 90% of wellbore instability problems occur in shale formations. Water-sensitive active mudstone and soft mudstone are very easy to hydrate and expand, resulting in downhole complications such as diameter shrinkage, collapse, bit balling and sticking. At the same time, the hydration and ...

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Problems solved by technology

[0005] The present invention aims to overcome the problems of poor temperature resistance and poor stability of existing inhibitors in the background technology, and provides a method for preparing a high-temperature resistant binary copolymerized low-molecular-weight polyamine inhibitor for water-based drilling fluids. The water-based drilling fluid The anti-high temperature binary copolymerization low molecular weight polyamine inhibitor for liquid has stronger temperature resistance and stability, which can improve the inhibitory effect of water-based drilling fluid on shale formations, improve the stability of the well wall, reduce downhole complexity, and promote water-based drilling. Advances in base drilling fluid technology and smooth oil and gas exploration

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