Methods and compositions for stimulating the production of hydrocarbons from subterranean formations

Patent metadata

Field	Value
Publication number	US-9809741-B2
Application number	US-201615249760-A
Country	US
Kind code	B2
Filing date	Aug 29, 2016
Priority date	Mar 14, 2013
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

Methods and compositions for stimulating of the production of hydrocarbons (e.g., formation crude oil and/or formation gas) from subterranean formations, and methods of selecting a composition for treating an oil or gas well. In some embodiments, the compositions are emulsions or microemulsions, which may include water, a terpene, and a surfactant.

First claim

What is claimed is:

1. A method comprising:
selecting an emulsion or a microemulsion composition for injection into a wellbore of a well based on a determination of whether formation crude oil is produced or whether formation gas is produced by the well,
wherein, when formation crude oil is produced by the well, the emulsion or the microemulsion composition is selected to comprise a terpene having a phase inversion temperature greater than 43° C., water, and a surfactant; and
wherein, when formation gas is produced by the well, the emulsion or the microemulsion is selected to comprise a terpene having a phase inversion temperature less than 43° C., water and a surfactant; and
injecting the emulsion or the microemulsion into the wellbore.

2. The method of claim 1 , wherein injecting the emulsion or the microemulsion into the wellbore increases production of formation crude oil or formation gas by the well.

3. The method of claim 1 , wherein the ratio of water to terpene is about 1:1.

4. The method of claim 1 , wherein the terpene is selected from the group consisting of linalool, geraniol, nopol, α-terpineol, menthol, eucalyptol, menthone, d-limonene, terpinolene, β-occimene, γ-terpinene, α-pinene, and citronellene.

5. The method of claim 1 , wherein the emulsion or the microemulsion comprises a first type of terpene and a second type of terpene.

6. The method of claim 1 , wherein the emulsion or the microemulsion is diluted with an aqueous fluid prior to injection into the wellbore.

7. The method of claim 1 , wherein the emulsion or the microemulsion is diluted to between about 0.1 wt % and about 2 wt %.

8. The method of claim 1 , wherein the emulsion or the microemulsion is diluted to between about 0.2 wt % and about 0.4 wt %.

9. The method of claim 1 , wherein the emulsion or the microemulsion is diluted with water or brine.

10. The method of claim 1 , wherein the emulsion or the microemulsion further comprises a freezing point depression agent.

11. The method of claim 10 , wherein the emulsion or the microemulsion comprises a first type of freezing point depression agent and a second type of freezing point depression agent.

12. The method of claim 10 , wherein the freezing point depression agent comprises an alkylene glycol, an alcohol, and/or a salt.

13. The method of claim 10 , wherein the freezing point depression agent is present in an amount between about 5 wt % and about 40 wt %.

14. The method of claim 1 , wherein the emulsion or the microemulsion comprises a first type of surfactant and a second type of surfactant.

15. The method of claim 1 , wherein the surfactant is selected from the group consisting of alkyl polyglycol or alkyl polyglucoside nonionic surfactants, mixtures of said nonionic surfactants with an ionic surfactant comprising anionic, cationic, or zwitterionic surfactants.

16. The method of claim 1 , wherein the surfactant is present in an amount between about 15 wt % and 55 wt %.

17. The method of claim 1 , wherein the phase inversion temperature is determined using a 1:1 ratio of terpene:de-ionized water and a 1:1 blend of surfactant comprising linear C 12 -C 15 alcohol ethoxylates with on average 7 moles of ethylene oxide and isopropyl alcohol.

Assignees

• Flotek Chemistry Llc

Inventors

• Hill Randal M
• Champagne Lakia M
• Lett Nathan L
• Green Maria Elizabeth
• Saboowala Hasnain

Classifications

• C09K8/92

  characterised by their form or by the form of their components, e.g. encapsulated material (C09K8/70 takes precedence) · CPC title

• C09K8/602 Primary

  containing surfactants · CPC title

• E21B43/16

  Enhanced recovery methods for obtaining hydrocarbons · CPC title

• C09K8/584

  characterised by the use of specific surfactants · CPC title

• E21B43/26

  by forming crevices or fractures · CPC title