Nanometer plugging water-based drilling fluid and preparation method and use thereof

Patent metadata

Field	Value
Publication number	US-11162010-B2
Application number	US-202016748144-A
Country	US
Kind code	B2
Filing date	Jan 21, 2020
Priority date	Dec 3, 2019
Publication date	Nov 2, 2021
Grant date	Nov 2, 2021

Abstract

A nanometer plugging water-based drilling fluid and preparation method and use thereof are within this disclosure. The nanometer plugging water-based drilling fluid comprise a nanometer plugging agent. The nanometer plugging agent may be surface modified SiO 2 powder with the surfactant. The surfactant may be sodium dodecyl benzene sulfonate and/or sodium dodecyl sulfate. The nanometer plugging water-based drilling fluid may perform effective anti-collapse of stratum and maintain the stability of stratum.

First claim

The invention claimed is:

1. A nanometer plugging water-based drilling fluid comprising water, bentonite, an anti-collapse agent, a nanometer plugging agent, a weighting agent, a shale inhibitor, a filtrate reducer, and a lubricant; wherein
the anti-collapse agent is sulfonated asphalt;
the nanometer plugging agent is surface modified SiO 2 powder comprising surfactant, and has an average particle size of 10-80 nm, wherein the surfactant is sodium dodecyl sulfate and the surface modified SiO 2 powder further comprises SiO 2 surface modified with linear alkylbenzene sulfonate (LAS);
the weighting agent is limestone with an average particle size of 2-10 μm;
the shale inhibitor is an organic acid ester;
the filtrate reducer is a polyanionic cellulose;
the lubricant is graphite;
based on 100 parts by weight of water, the bentonite is 1-5 parts by weight, the anti-collapse agent is 2-16 parts by weight, the nanometer plugging agent is 0.1-6 parts by weight, the weighting agent is 20-60 parts by weight, the shale inhibitor is 0.5-2 parts by weight, the filtrate reducer is 2-12 parts by weight and the lubricant is 0.2-4 parts by weight.

2. The drilling fluid of claim 1 , wherein based on 100 parts by weight of water, the bentonite is 2-4 parts by weight, the anti-collapse agent is 4-12 parts by weight, the nanometer plugging agent is 0.3-4 parts by weight and the weighting agent is 25-45 parts by weight.

Assignees

• Univ Southwest Petroleum

Inventors

• Bai Yang
• Luo Pingya
• Li Guojun
• Li Cheng
• Zhang Hao
• Cheng Yan

Classifications

• C09K8/206 Primary

  Derivatives of other natural products, e.g. cellulose, starch, sugars · CPC title

• C09K2208/10

  Nanoparticle-containing well treatment fluids · CPC title

• C09K8/514

  of natural origin, e.g. polysaccharides, cellulose (C09K8/512 takes precedence) · CPC title

• C09K8/508

  macromolecular compounds {(C09K8/512 takes precedence)} · CPC title

• C09K2208/12

  Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating · CPC title