Cement spacer fluid with polyethyleneimine hydrochloride salt as a shale inhibitor

Patent metadata

Field	Value
Publication number	US-12173226-B2
Application number	US-202318336560-A
Country	US
Kind code	B2
Filing date	Jun 16, 2023
Priority date	Aug 2, 2022
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

A cement spacer fluid and a method for making and a method for using the cement spacer fluid are provided. The cement spacer fluid includes a polyethyleneimine hydrochloride (PEI HCl) salt, an aqueous solvent, a viscosifier, and a weighting agent.

First claim

What is claimed is:

1. A cement spacer fluid for cementing a wellbore, comprising:
a polyethyleneimine hydrochloride (PEI HCl) salt wherein:
a stoichiometric amount of HCl is used relative to a plurality of nitrogen atoms in PEI; and
the PEI HCl salt comprises a compound with the structural formula
[H 2 NCH 2 CH 2 (NHCH 2 CH 2 ) x NH 2 ]·HCl,

wherein x is between 4 and 100;
an aqueous solvent;
a viscosifier; and
a weighting agent.

2. The cement spacer fluid of claim 1 , comprising between about 0.5 wt. % of the PEI HCl salt and about 25 wt. % of the PEI HCl salt.

3. The cement spacer fluid of claim 1 , comprising between about 0.1 wt. % of the viscosifier and about 10 wt. % of the viscosifier.

4. The cement spacer fluid of claim 1 , comprising between about 0.1 wt. % of the weighting agent and about 80 wt. % of the weighting agent.

5. The cement spacer fluid of claim 1 , comprising a defoaming agent.

6. The cement spacer fluid of claim 1 , wherein the PEI HCl salt includes linear, branched, or cyclic chains, or any combinations thereof.

Assignees

• Saudi Arabian Oil Co

Inventors

• Wagle Vikrant
• Al Safran Ali Mohammed Hussain
• Al-Yami Abdullah Saleh Hussain
• Pal Omprakash
• Alkhalaf Sara Abdulaziz

Classifications

• C09K8/424 Primary

  using "spacer" compositions · CPC title

• C09K8/46

  containing inorganic binders, e.g. Portland cement · CPC title

• E21B33/16

  using plugs for isolating cement charge; Plugs therefor {(stage cementing E21B33/146; spacer compositions C09K8/424)} · CPC title

• C09K8/40 Primary

  Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses · CPC title

• C09K8/467

  containing additives for specific purposes · CPC title