Polyhedral oligomeric silsesquioxane as rheology booster for invert emulsion oil-based mud

Patent metadata

Field	Value
Publication number	US-2024368449-A1
Application number	US-202418772475-A
Country	US
Kind code	A1
Filing date	Jul 15, 2024
Priority date	Sep 30, 2021
Publication date	Nov 7, 2024
Grant date	—

Abstract

A composition of an invert emulsion oil-based drilling fluid is provided. The composition may include an oil phase and an aqueous phase. The oil phase may include an oleaginous fluid, an organophilic clay-based solid viscosifier, and a liquid viscosifier including a POSS. Further provided is a method of introducing the composition including the POSS into a wellbore. After introduction of the composition into the wellbore, the method includes maintaining wellbore conditions to provide a stable rheological property for a period up to about 96 hours in an HPHT section of a wellbore.

First claim

What is claimed:

1 . A composition of an invert emulsion oil-based drilling fluid formulation, comprising:
an invert emulsion of an oil phase and an aqueous phase, the oil phase including an oleaginous fluid; a solid viscosifier that is an organophilic clay-based viscosifier; and a liquid viscosifier that is a polyhedral oligomeric silsesquioxane (POSS), wherein the POSS is a glycidyl POSS.

2 . The composition of claim 1 , wherein the oleaginous fluid includes a dearomatized mineral oil.

3 . The composition of claim 2 , wherein the dearomatized mineral oil is Safra oil.

4 . The composition of claim 1 , wherein the aqueous phase is a calcium chloride anhydride-based brine.

5 . The composition of claim 1 , wherein the solid viscosifier has a specific gravity of from 1 to 5.

6 . The composition of claim 1 , wherein the solid viscosifier includes silica in an amount of from about 1 to 20 wt % of the total weight of the solid viscosifier.

7 . The composition of claim 1 , wherein the solid viscosifier includes an amine.

8 . The composition of claim 7 , wherein the amine is a bis(hydrogenated tallow alkyl) methylamine.

9 . The composition of claim 7 , wherein a content of the amine in the solid viscosifier is a non-zero value up to about 1 wt % of the total weight of the solid viscosifier.

10 . The composition of claim 1 , further comprising one or more selected from the group consisting of a weighting agent, barite; a friction reducer; a filtration control agent; an emulsion activator; a primary emulsifier; and a secondary emulsifier.

11 . The composition of claim 10 , wherein the primary emulsifier comprises a fatty acid and a hydrocarbon.

12 . The composition of claim 10 , wherein the primary emulsifier is a basic emulsifier.

13 . The composition of claim 1 , wherein a viscosity of the composition relative to a shear rate is from 0.1 to 50 cP at 6 rpm.

14 . The composition of claim 1 , wherein a yield point of the composition is in a range from 1 to 100 lb/100 ft 2 .

15 . The composition of claim 1 , wherein a plastic viscosity of the composition is in a range from 20 to 150 cP.

16 . The composition of claim 1 , wherein a gel strength of the composition is in a range from 0.1 to 30 lb/100 ft 2 .

17 . The composition of claim 1 , wherein an electrical stability of the composition is in a range from 100 to 700 volts.

18 . The composition of claim 1 , wherein the solid viscosifier is in the form of a suspension.

Assignees

• Saudi Arabian Oil Co

Inventors

• Ramasamy Jothibasu
• Wagle Vikrant

Classifications

• E21B43/12

  Methods or apparatus for controlling the flow of the obtained fluid to or in wells (E21B43/25 takes precedence; valve arrangements E21B34/00) · CPC title

• C09K2208/28

  Friction or drag reducing additives · CPC title

• E21B21/00

  Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03) · CPC title

• C09K8/36 Primary

  Water-in-oil emulsions · CPC title