Lubricants for water-based drilling fluids

Patent metadata

Field	Value
Publication number	US-2018223153-A1
Application number	US-201715660118-A
Country	US
Kind code	A1
Filing date	Jul 26, 2017
Priority date	Feb 3, 2017
Publication date	Aug 9, 2018
Grant date	—

Abstract

Embodiments are directed to a lubricant package for water based drilling fluids. The lubricant package includes water, a polyethylene glycol, and a lubricating agent. The lubricating agent includes triethanolamine, or a C12-C14 alcohol ethoxylate, or a combination of triethanolamine and C12-C14 alcohol ethoxylate. The weight ratio of the polyethylene glycol to the lubricating agent in the lubricant package is from 1:2 to 2:1. Embodiments are also directed to a water-based drilling fluid composition including an aqueous base fluid, one or more additives, and the lubricant package for water based drilling fluids.

First claim

What is claimed is:

1 . A lubricant package for water based drilling fluids, the lubricant package comprising:
water; a polyethylene glycol; and a lubricating agent comprising triethanolamine, or a C 12 -C 14 alcohol ethoxylate, or a combination of triethanolamine and C 12 -C 14 alcohol ethoxylate,
in which the weight ratio of the polyethylene glycol to the lubricating agent in the lubricant package is from 1:2 to 2:1.

2 . The lubricant package of claim 1 , in which the polyethylene glycol comprises polyethylene glycols having a distribution of molecular weights and an average molecular weight of 500 to 700 grams/mole.

3 . The lubricant package of claim 1 , in which the polyethylene glycol comprises polyethylene glycols having a distribution of molecular weights and an average molecular weight of 250 to 350 grams/mole.

4 . The lubricant package of claim 1 , in which the lubricating agent comprises triethanolamine or a combination of triethanolamine and C 12 -C 14 alcohol ethoxylate.

5 . The lubricant package of claim 1 , in which the lubricating agent comprises C 12 -C 14 alcohol ethoxylate or a combination of triethanolamine and C 12 -C 14 alcohol ethoxylate.

6 . The lubricant package of claim 1 , in which the C 12 -C 14 alcohol ethoxylate is a C 13 alcohol ethoxylate.

7 . The lubricant package of claim 1 , in which the alcohol ethoxylate is a condensate of synthetic branched isotridecyl alcohol with three to thirteen moles of ethylene oxide.

8 . The lubricant package of claim 1 , in which the alcohol ethoxylate is a condensate of synthetic branched isotridecyl alcohol with eight moles of ethylene oxide.

9 . The lubricant package of any of claim 1 , in which the alcohol ethoxylate has the chemical formula CH 3 CH(CH 3 )(CH 2 ) 10 —(OCH 2 CH 2 ) 8 —OH.

10 . The lubricant package of claim 1 , comprising a C 12 -C 14 alcohol ethoxylate having a hydroxyl value of 98-104 mg KOH/g measured according to SKIMS/QAD-SOP-209.

11 . The lubricant package of claim 1 , comprising a C 12 -C 14 alcohol ethoxylate having a hydrophilic-lipophilic balance of 8 to 16.

12 . The lubricant package of claim 1 , in which the weight ratio of the polyethylene glycol to the lubricating agent in the lubricant package is from 2:3 to 3:2.

13 . The lubricant package of claim 1 , in which the lubricant package comprises 70 wt. % to 98 wt. % water.

14 . The lubricant package of claim 1 , in which the lubricant package has a coefficient of friction less than 20.

15 . A water-based drilling fluid composition comprising:
an aqueous base fluid; one or more additives chosen from a weighting material, a fluid-loss control additive, a viscosifier, and an alkali compound; and a lubricant package comprising:
water;
a polyethylene glycol; and
a lubricating agent comprising triethanolamine, or a C 12 -C 14 alcohol ethoxylate, or a combination of triethanolamine and C 12 -C 14 alcohol ethoxylate,
in which the weight ratio of the polyethylene glycol to the lubricating agent is from 1:2 to 2:1.

16 . The water-based drilling fluid composition of claim 15 , in which the polyethylene glycol comprises polyethylene glycols having a distribution of molecular weights and with an average molecular weight of 590 to 610 grams/mole.

17 . The water-based drilling fluid composition of claim 15 , in which the lubricating agent comprises triethanolamine or a combination of triethanolamine and C 12 -C 14 alcohol ethoxylate.

18 . The water-based drilling fluid composition of claim 15 , in which the lubricating agent comprises C 12 -C 14 alcohol ethoxylate or a combination of triethanolamine and C 12 -C 14 alcohol ethoxylate.

19 . The water-based drilling fluid composition of claim 15 , in which the alcohol ethoxylate is a condensate of synthetic branched isotridecyl alcohol with eight moles of ethylene oxide.

20 . The water-based drilling fluid composition of claim 15 , in which the weight ratio of the polyethylene glycol to the lubricating agent in the lubricant package is from 2:3 to 3:2.

Assignees

• Saudi Arabian Oil Co

Inventors

• Al-Yami Abdullah
• Albahrani Hussain
• Wagle Vikrant
• Safran Ali
• Alhareth Naser
• Alhelal Abdulaziz
• Awadh Abdulla Hussein

Classifications

• C09K8/514

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

• C09K8/035 Primary

  Organic additives · CPC title

• C10N2040/22

  with essential removal of material {, e.g. cutting, grinding or drilling} · CPC title

• C10N2020/02

  Viscosity; Viscosity index · CPC title

• C10N2020/017

  Specific gravity or density · CPC title