Loss circulation material composition having alkaline nanoparticle based dispersion and water insoluble hydrolysable polyester

Patent metadata

Field	Value
Publication number	US-10961430-B2
Application number	US-201916423883-A
Country	US
Kind code	B2
Filing date	May 28, 2019
Priority date	Aug 17, 2017
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A lost circulation material (LCM) is provided having an alkaline nanosilica dispersion and a polyester activator. The alkaline nanosilica dispersion and the polyester activator may form a gelled solid after interaction over a contact period. Methods of lost circulation control using the LCM are also provided.

First claim

What is claimed is:

1. A lost circulation material (LCM) composition, comprising:
an alkaline nanosilica dispersion; and
a water insoluble polyester, the water insoluble polyester selected to form a gelled solid with the alkaline nanosilica dispersion after a period, wherein the weight ratio of the alkaline nanosilica dispersion to the water insoluble polyester is in a range of 50:1 to 80:1.

2. The LCM composition of claim 1 , wherein the period comprises a range of 0.5 hours to 24 hours.

3. The LCM composition of claim 1 , wherein the water insoluble polyester comprises at least one of a polylactide, a polyhydroxyalkanoate, polyglycolide, polylactoglycolide, and polycaprolactone.

4. A solid gelled material useful for mitigating lost circulation, where the solid gelled material forms by introducing an alkaline nanosilica dispersion and a water insoluble polyester to a lost circulation zone, the nanosilica dispersion comprising amorphous silicon dioxide and water, such that the nanosilica dispersion and the water insoluble polyester contact the lost circulation zone for a period such that the solid gelled material forms, wherein the weight ratio of the alkaline nanosilica dispersion to the water insoluble polyester is in a range of 50:1 to 80:1.

5. The solid gelled material of claim 4 , wherein the water insoluble polyester comprises at least one of a polylactide, a polyhydroxyalkanoate, polyglycolide, polylactoglycolide, and polycaprolactone.

6. The solid gelled material of claim 4 , wherein the water insoluble polyester comprises an amount in the range of 0.1 percent by volume of the total volume (v/v %) to 10 v/v %.

7. The solid gelled material of claim 4 , wherein the water insoluble polyester is introduced separately from the alkaline nanosilica dispersion to the lost circulation zone.

8. The solid gelled material of claim 4 , wherein the water insoluble polyester and the alkaline nanosilica dispersion are introduced simultaneously to the lost circulation zone.

9. The LCM composition of claim 1 , comprising a catalyst selected to increase an hydrolysis rate of the water insoluble polyester.

10. The LCM composition of claim 9 , wherein the catalyst comprises hydrochloric acid or sulfuric acid.

Assignees

• Saudi Arabian Oil Co

Inventors

• Wagle Vikrant
• Kalgaonkar Rajendra
• Al-Yami Abdullah
• Alsaihati Zainab

Classifications

• C04B28/24 Primary

  containing alkyl, ammonium or metal silicates; containing silica sols {(reaction mixtures resulting in mineral polymers C04B28/006; polymeric reaction products of alkali metal silicates with isocyanates C08G18/3895)} · CPC title

• C09K2208/10

  Nanoparticle-containing well treatment fluids · CPC title

• C09K8/5086 Primary

  obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C09K8/5045

  containing inorganic compounds · CPC title

• C01F11/18

  Carbonates · CPC title