Development of anti-bit balling fluids

Patent metadata

Field	Value
Publication number	US-10538692-B2
Application number	US-201916451167-A
Country	US
Kind code	B2
Filing date	Jun 25, 2019
Priority date	Feb 3, 2017
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

Anti-bit balling drilling fluids and methods of making and using drilling fluids are provided. The anti-bit balling drilling fluid contains water, a clay-based component, and at least one of a surfactant having the formula: R—(OC 2 H 4 ) x —OH, where R is a hydrocarbyl group having from 10 to 20 carbon atoms and x is an integer from 1 and 10, or a polyethylene glycol having the formula: H—(O—CH 2 —CH 2 ) n —OH, where n is an integer from 1 to 50. Methods of making and using these drilling fluids are also provided.

First claim

What is claimed is:

1. A method for using a drilling fluid in drilling operations, the method comprising:
mixing:
water,
from 50 to 700 lb/bbl of a clay-based component based on total weight of the drilling fluid, and
a polyethylene glycol comprising Formula (II):

where n is an integer from 1 to 50, and

optionally, including at least one or more additives selected from the group consisting of weighting agents, fluid loss control agents, lost circulation control agents, viscosifiers, dispersants, pH buffers, electrolytes, glycols, glycerols, dispersion aids, corrosion inhibitors, defoamers, starches, xanthan gum polymers, and combinations thereof,
to produce the drilling fluid,
wherein the drilling fluid consists of the water, the clay-based component, and the polyethylene glycol, and optionally, the at least one or more additives,
wherein the drilling fluid has an accretion percentage of less than or equal to 18%, and

introducing the drilling fluid to a subterranean formation.

2. The method of claim 1 , where introducing the drilling fluid comprises injecting the drilling fluid and at least partially circulating the drilling fluid within the subterranean formation.

3. The method of claim 1 , where the drilling fluid comprises from 28 to 850 lb/bbl water and from 0.02 to 180 lb/bbl of the polyethylene glycol, based on total weight of the drilling fluid.

4. The method of claim 1 , where the polyethylene glycol has a weight average molecular weight of from 300 grams per mol (g/mol) to 500 g/mol, as measured according to GPC.

5. The method of claim 1 , where the drilling fluid comprises from 28 to 850 lb/bbl water based on total weight of the drilling fluid.

6. The method of claim 1 , where the drilling fluid comprises from 0.02 to 180 lb/bbl of the polyethylene glycol, based on total weight of the drilling fluid.

7. The method of claim 1 , where the clay-based component comprises one or more components selected from the group consisting of lime (CaO), CaCO 3 , bentonite, montmorillonite clay, barium sulfate (barite), hematite (Fe 2 O 3 ), mullite (3Al 2 O 3 .2SiO 2 or 2Al 2 O 3 .SiO 2 ), kaolin (Al 2 Si 2 O 5 (OH) 4 or kaolinite), alumina (Al 2 O 3 , or aluminum oxide), silicon carbide, tungsten carbide, and combinations thereof.

Assignees

• Saudi Arabian Oil Co

Inventors

• Al-Yami Abdullah
• Ba Hamdan Abdulaziz A
• Haidary Saleh A
• Wagle Vikrant
• Albahrani Hussain
• Safran Ali
• Alhareth Nasser
• Awadh Abdulla H

Classifications

• C09K8/514

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

• C09K8/035

  Organic additives · CPC title

• C10N2040/22

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

• C10N2020/04

  Molecular weight; Molecular weight distribution · CPC title

• C10N2050/013

  Water-in-oil · CPC title