Solid acids for acidizing subterranean formations

Patent metadata

Field	Value
Publication number	US-9982186-B2
Application number	US-201415324310-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Sep 30, 2014
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

Methods of acidizing subterranean formations using solid acids are described. The methods include providing a treatment fluid containing a solid acid chelating agent and introducing the treatment fluid into the subterranean formation. The solid acid chelating agent includes at least one aminopolycarboxylic acid functional group and at least one phosphonic acid functional group. The treatment fluid is substantially free of an additional acid or acid-generating compound.

First claim

What is claimed is:

1. A method of acidizing a subterranean formation comprising:
providing a treatment fluid containing a solid acid chelating agent, wherein the solid acid chelating agent comprises N-phosphonomethyl iminodiacetic acid (PMIDA), and the treatment fluid comprises less than 1% by weight of an additional acid or acid-generating compound; and
introducing the treatment fluid into the subterranean formation.

2. The method of claim 1 , wherein the subterranean formation comprises a carbonate mineral.

3. The method of claim 2 , wherein the carbonate mineral comprises calcium carbonate, magnesium carbonate, dolomite, or a mixture thereof, and PMIDA, when ionized, forms a complex with one or more metal cations released from the carbonate mineral.

4. The method of claim 1 , wherein the PMIDA is in its fully protonated form.

5. The method of claim 1 , wherein the treatment fluid comprises less than 1% by weight of antisludge additives, iron control agents, scale inhibitors, and corrosion inhibitors.

6. The method of claim 1 , wherein bottomhole static temperatures in the subterranean formation exceed 115° F.

7. A method of acidizing a subterranean formation comprising:
providing a treatment fluid containing a solid acid chelating agent, wherein the solid acid chelating agent comprises N-phosphonomethyl iminodiacetic acid (PMIDA) in an amount of about 1% to about 50% by weight of the treatment fluid, and the treatment fluid comprises less than 1% by weight of an additional acid or acid-generating compound; and
introducing the treatment fluid into the subterranean formation, wherein the subterranean formation comprises a carbonate mineral.

8. The method of claim 7 , wherein the carbonate mineral comprises calcium carbonate, magnesium carbonate, or both, and the PMIDA, when ionized forms a complex with one or more metal cations released from the carbonate mineral.

9. The method of claim 7 , wherein the treatment fluid comprises less than 1% by weight of antisludge additives, iron control agents, scale inhibitors, and corrosion inhibitors.

Assignees

• Halliburton Energy Services Inc
• Halliburton Energy Services Inc

Inventors

• Beuterbaugh Aaron Michael
• Reyes Enrique Antonio
• Smith Alyssa Lynn

Classifications

• E21B43/25

  Methods for stimulating production {(by vibrating earth formations E21B43/003)} · CPC title

• C09K8/035

  Organic additives · CPC title

• C09K8/62

  Compositions for forming crevices or fractures · CPC title

• E21B43/04

  Gravelling of wells · CPC title

• C09K8/56

  Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof (compositions for plastering borehole walls C09K8/50; {Soil-conditioning materials or soil-stabilising materials in general C09K17/00}) · CPC title