Preparation method of environment-friendly high-temperature-resistant water-based drilling fluid plugging anti-collapse agent

Abstract

The invention provides a preparation method of an environment-friendly high-temperature-resistant water-based drilling fluid plugging anti-collapse agent. The preparation method comprises the following steps: mixing and emulsifying a styrene monomer, an acrylic monomer and an emulsifier MS-1 aqueous solution to prepare a pre-polymerized emulsion; dispersing a hydrophilic monomer, a cationic monomer and an emulsifier MS-1 in water, adjusting the pH value to 6.5-8.5, then adding a mixed monomer of a styrene monomer and an acrylic monomer, and mixing and emulsifying to prepare a post-polymerization emulsion; adding a cross-linking agent 1 and an initiator 1 into the pre-polymerization emulsion, uniformly dispersing, and carrying out a reaction; adding the post-polymerization emulsion in a dropwise manner, adding a cross-linking agent 2 and an initiator 2, uniformly dispersing, continuously carrying out a reaction, drying, and crushing to obtain the plugging anti-collapse agent. The plugging anti-collapse agent prepared by the method is of a core-shell structure, is non-toxic and good in environmental protection performance, has excellent filtrate loss reduction, plugging and collapseprevention performances, has good temperature resistance, and can realize effective plugging and collapse prevention of a high-temperature stratum.

Description

technical field [0001] The invention relates to a preparation method of an environment-friendly anti-high temperature water-based drilling fluid plugging and anti-slumping agent, which belongs to the field of oilfield chemistry in the petroleum industry. [0002] technical background [0003] Drilling fluid is called the "blood" of drilling. Water-based drilling fluid is a complex colloid-suspension multi-level dispersion system formed by clay particles and various chemical agents in water. It is an indispensable core engineering technology in oil and gas exploration and development. It directly affects the safety and efficiency of drilling and is the key to ensure the success of drilling. [0004] Drilling fluid sulfonated materials mainly include sulfonated asphalt, sulfonated lignite, sulfonated phenolic resin, sulfonated tannin, sulfonated tannin, etc., which have strong temperature resistance and play an important role in the drilling process of deep wells, ultra-deep we...

AI Technical Summary

Problems solved by technology

Conventional materials, including polymeric materials, cannot achieve the performance of the above-mentioned sulfonated materials

For example, Chinese patent document CN108728057A discloses a nano-resin emulsion plugging agent for drilling fluid. The raw materials include acrylic acid, butyl acrylate, styrene and emulsifiers. The plugging agent prepared by this invention can plug micro-fractures during drilling. , can also play a certain role in bearing pressure and preventing collapse on the well wall, but the plugging performance is not good, and the plugging effect on high-temperature formations has not been involved