A kind of amphoteric phenolic resin high temperature drilling fluid fluid loss reducer and preparation method thereof

Abstract

The invention discloses an amphoteric phenolic resin high-temperature drilling fluid filtrate reducer and a preparation method thereof. The preparation method comprises the following steps: (1) reacting by virtue of phenol, formaldehyde and hordenine according to a molar ratio of 10 to (10-15) to (1-2), so as to obtain cationized linear resin; (2) mixing sodium pyrosulfite with distilled water in the same mass, and dropwise adding a formaldehyde solution to react, so as to obtain a sulfomethylation agent; and (3) reacting by virtue of phenol, the sulfomethylation agent, the formaldehyde solution and the cationized linear resin, dropwise adding an iodomethane solution in a dark condition, so as to obtain the amphoteric phenolic resin high-temperature drilling fluid filtrate reducer. The preparation method is simple and is high in yield and low in cost, and the prepared amphoteric phenolic resin high-temperature drilling fluid filtrate reducer has relatively high temperature resistance and salt resistance at low usage.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemical drilling fluid treatment agents, and in particular relates to an amphoteric phenolic resin high-temperature drilling fluid fluid loss reducer and a preparation method thereof. Background technique [0002] With the scarcity of petroleum resources and the need to meet people's production and living needs, the development of deep wells and ultra-deep wells has become inevitable. However, due to the high downhole temperature and pressure of deep wells and ultra-deep wells, and complex formation structures, high-pressure oil and gas layers and brine layers are often encountered during drilling, and people are concerned about technical problems such as unstable performance of drilling and completion fluids and excessive filtration. Difficult to solve, complex downhole accidents such as downhole collapse and pipe sticking often occur during the drilling operation, which brings great inconvenie...

AI Technical Summary

Problems solved by technology

Later research and improvement, when using sulfonated phenolic resin, add chromium ion (Cr 2+ ), through the complexation of metal cations, the adsorption capacity of sulfonated phenolic resin to clay particles can be significantly improved, thereby improving its high temperature resistance performance, but the introduction of heavy metal ions will cause damage to the formation and seriously pollute the environment. Without the addition of chromium ions, the amount of sulfonated phenolic resin added in the field application will be very large, and there will be many problems such as low utilization rate of treatment agent, waste of raw materials, high cost, etc.

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