Well-treatment fluid, method for forming fracture, and method for isolating wellbore

Patent metadata

Field	Value
Publication number	US-2018355239-A1
Application number	US-201815976962-A
Country	US
Kind code	A1
Filing date	May 11, 2018
Priority date	Jun 7, 2017
Publication date	Dec 13, 2018
Grant date	—

Abstract

Provided is a well-treatment fluid that reduces a load on the environment.
A well-treatment fluid containing a non-ionic polyamino acid derivative including an α-type or β-type polyaspartic acid monomer unit represented by Formula (I) and an α-type or β-type polyaspartic acid monomer unit represented by Formula (II).

First claim

1 . A well-treatment fluid comprising:
a non-ionic polyamino acid derivative; the non-ionic polyamino acid derivative including: an α-type or β-type polyaspartic acid monomer unit represented by Formula (I):

where R 1 is a hydrocarbon group having from 3 to 18 carbons; and
an α-type or β-type polyaspartic acid monomer unit represented by Formula (II):

where R 2 is a group selected from the group consisting of a hydroxymethyl group, a hydroxyethyl group, a hydroxypropyl group, a hydroxybutyl group, a hydroxypentyl group, a hydroxyethoxyethyl group, a methoxymethyl group, a methoxyethyl group, a methoxypropyl group, a methoxybutyl group, a methoxypentyl group, an ethoxymethyl group, an ethoxyethyl group, an ethoxypropyl group, an ethoxybutyl group, an ethoxypentyl group, an N,N-dimethylaminopropyl group, and an N,N-diethylaminopropyl group.

2 . A method for forming a fracture, the method comprising:
injecting the well-treatment fluid described in claim 1 as a fracturing fluid in a wellbore and forming a fracture in a subterranean formation by hydraulic fracturing.

3 . A method for isolating a wellbore the method comprising injecting the well-treatment fluid described in claim 1 as a temporary diverting agent in a wellbore.

Assignees

• Kureha Corp

Inventors

• Abe Shunsuke

Classifications

• E21B43/26

  by forming crevices or fractures · CPC title

• C09K8/68 Primary

  containing organic compounds · CPC title

• C08G69/40

  Polyamides containing oxygen in the form of ether groups (C08G69/12, C08G69/32 take precedence) · CPC title

• E21B41/02

  in situ inhibition of corrosion in boreholes or wells · CPC title

• C09K8/5086

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