Siloxane surfactant additives for oil and gas applications

Patent metadata

Field	Value
Publication number	US-10590332-B2
Application number	US-201414445006-A
Country	US
Kind code	B2
Filing date	Jul 28, 2014
Priority date	Mar 14, 2013
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

A well treatment additive includes a siloxane surfactant, a solvent and an aqueous phase. The solvent is preferably a terpene hydrocarbon. Also disclosed is a method for using the well treatment additive to form and enhance the properties of terpene solvent based additives useful for the treatment of oil and gas wells. Methods of using the novel well treatment additives include using the additives in a variety of well treatment processes including, but not limited to, acidizing operations, hydraulic fracturing operations, well remediation operations and water removal operations.

First claim

It is claimed:

1. A well treatment additive comprising:
a siloxane surfactant in an amount between about 10 wt % and about 15 wt % versus the total well treatment additive, wherein the siloxane surfactant has a formula selected from the group consisting of: MD a (D′R 1 ) b M (formula 1) and (M′R 1 )D a (M′R 1 ) (formula 2)
wherein “R 1 ” represents an organic radical comprising —(CH 2 ) n —(OCH 2 CH 2 ) x —(OCH(CH 3 )CH 2 ) y —OR 3 , in which “n” is between 3 and about 11, “x” is between 3 and about 30, “y” is between 0and about 30, and “R 3 ” is —H;
wherein “M” represents Me 3 SiO 1/2 , D represents —Me 2 SiO—, “M′R 1 ” represents Me 2 (R 1 )SiO 1/2 —, “D′R 1 ” represents —Me(R 1 )SiO—, and “Me” represents —CH 3 ;
wherein for formula 1, “a” is 0-200 and “b” is 1-20;
wherein for formula 2, “a” is 4-50; wherein the siloxane surfactant is a trisiloxane ethoxylate graft-type copolymer
a hydrocarbon surfactant in an amount between about 10 wt % and about 35 wt % versus the total well treatment additive, wherein the hydrocarbon surfactant is selected from the group consisting of polyoxyethylene alky ethers, dialkyl sulfosuccinates, alkyl sulfates, sulfonates, carboxylates, amine oxides, primary alkylamines, dialkyl secondary amines, ethoxylated fatty amines, and combinations thereof;
a solvent, wherein the solvent is a terpene hydrocarbon in an amount between about 5 wt % and about 40 wt % versus the total well treatment additive; and
an aqueous phase, wherein nano-sized particles of the solvent are distributed within the aqueous phase.

2. The well treatment additive of claim 1 , further comprising a co-solvent.

3. The well treatment additive of claim 2 , wherein the co-solvent is selected from the group consisting of alkyl alcohols containing from 1 to 4 carbon atoms, oligo-oxyalkylenes containing from 1 up to 3 units of ethylene oxide, and oligo-oxyalkylenes containing from 1 up to 3 units of propylene oxide.

4. The well treatment additive of claim 1 , wherein the terpene hydrocarbon is in an amount between about 10 wt% and about 15 wt% versus the total well treatment additive.

5. The well treatment additive of claim 1 , wherein the siloxane surfactant is a siloxane polyalkylene oxide copolymer.

6. The well treatment additive of claim 1 , wherein the siloxane surfactant is a trisiloxane ethoxylate graft-type copolymer.

7. A method of treating the near-wellbore region of a subterranean formation in a well comprising:
diluting the well treatment additive of claim 1 with a carrier fluid to a concentration of about 0.05-5 weight % of well treatment additive to carrier fluid to form a diluted well treatment additive;
introducing the diluted well treatment additive into the well;
allowing the diluted well treatment additive to contact the formation and proppant; and
leaving the diluted well treatment additive in the well to increase water displacement from the formation by both oil and gas.

8. The method of claim 7 , wherein the diluted well treatment additive is pumped into the well in combination with proppant during a hydraulic fracturing operation.

9. The method of claim 7 , wherein the diluted well treatment additive is pumped into the well at a high rate water pack with friction reducer.

10. The method of claim 7 , wherein the diluted well treatment additive is pumped into the well in combination with a selected acid during an acidizing treatment.

11. The well treatment additive of claim 1 , wherein the well treatment additive is transparent.

Assignees

• Flotek Chemistry Llc

Inventors

• Penny Glenn S
• Dismuke Keith Ingram
• Fox Richard Nelson
• Zelenev Andrei
• Hill Randal M

Classifications

• C09K8/604 Primary

  Polymeric surfactants · CPC title

• C09K2208/28

  Friction or drag reducing additives · CPC title

• C09K8/885

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

• C09K8/86

  containing organic compounds · CPC title

• C09K8/72

  Eroding chemicals, e.g. acids · CPC title