Treatment fluids for reducing subterranean formation damage

Patent metadata

Field	Value
Publication number	US-9862874-B2
Application number	US-201414438923-A
Country	US
Kind code	B2
Filing date	Jul 9, 2014
Priority date	Jul 9, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

Methods of introducing a treatment fluid into a subterranean formation having a filtercake deposited thereon, wherein the treatment fluid comprises a base fluid and an inclusion complex comprising a cyclodextrin compound and an acid precursor ester, and wherein the cyclodextrin compound delays hydrolysis of the acid precursor ester; contacting the treatment fluid with the filtercake; and hydrolyzing the acid precursor ester, thereby removing at least a portion of the filtercake.

First claim

The invention claimed is:

1. A method comprising:
forming an inclusion complex comprising an acid precursor ester and a cyclodextrin compound by combining the acid precursor ester and the cyclodextrin compound as a solution with stirring for at least two hours;
introducing a treatment fluid into a subterranean formation having a filtercake deposited thereon,
wherein the treatment fluid comprises a base fluid and the inclusion complex, and
wherein the inclusion complex delays hydrolysis of the acid precursor ester;
contacting the treatment fluid with the filtercake; and
hydrolyzing the acid precursor ester, thereby removing at least a portion of the filtercake.

2. The method of claim 1 , wherein the cyclodextrin compound is at least one of a cyclodextrin compound dimer and a cyclodextrin compound trimer.

3. The method of claim 1 , wherein the cyclodextrin compound is selected from the group consisting of α-cyclodextrin, β-cyclodextrin, γ-cyclodextrin, and any combination thereof.

4. The method of claim 1 , wherein the cyclodextrin compound is a cyclodextrin derivative selected from the group consisting of an acylated cyclodextrin, a hydroxylated cyclodextrin, a carboxylated cyclodextrin, an alkylated cyclodextrin, a methyl cyclodextrin, a hydroxyethyl cyclodextrin, a hydroxypropyl cyclodextrin, a 2-hydroxyethyl cyclodextrin, a carboxymethyl cyclodextrin, a carboxyethyl cyclodextrin, a glucosyl cyclodextrin, a maltosyl cyclodextrin, and any combination thereof.

5. The method of claim 1 , wherein the cyclodextrin compound is a cyclodextrin derivative selected from the group consisting of a hydroxypropyl-β-cyclodextrin, a glucosyl-α-cyclodextrin, a maltosyl-α-cyclodextrin, a glucosyl-β-cyclodextrin, a methyl-α-cyclodextrin, a hydroxyethyl-α-cyclodextrin, and 2-hydroxypropyl-γ-cyclodextrin, and any combination thereof.

6. The method of claim 1 , wherein the acid precursor ester is selected from the group consisting of a formate ester, a lactate ester, a citrate ester, a carboxylate ester, an acetate ester, a propionate ester, a propanoate ester, a butanoate ester, a methanoate ester, an ethanoate ester, a butyrate ester, a cyclic ester, an orthoester, a butyl acetate ester, a gamma-valerolactone ester, a triethylorthoformate ester, a triphynol phosphate ester, a phosphoric acid ester, an acrylate ester, an isoamyl acetate ester, an ethyl acetate ester, a methyl salicylate ester, an ethyl butyrate ester, a benzyl butyrate ester, an ethyl propionate ester, an ethyl benzoate ester, a benzyl acetate ester, a methyl butyrate ester, an octyl acetate ester, a n-propyl acetate ester, an ethyl phenylacetate ester, an ethyl ethanoate ester, and any combination thereof.

7. The method of claim 1 , wherein the molar ratio of the acid precursor ester to the cyclodextrin compound in the inclusion complex in a ratio of about 1:1 to about 20:1.

8. The method of claim 1 , wherein the filtercake is formed substantially of a particulate bridging material comprising an inorganic salt.

9. The method of claim 8 , wherein the inorganic salt is selected from the group consisting of calcium carbonate, manganese (II,II) oxide, zinc oxide, magnesium carbonate, and any combination thereof.

10. The method of claim 1 , wherein the filtercake is located on at least one of a face of the subterranean formation and a face of a fracture in the subterranean formation.

11. The method of claim 1 , wherein the subterranean formation has a temperature in the range of about 25° C. to about 150° C.

12. The method of claim 1 , wherein the treatment fluid is introduced into the subterranean formation as a pill.

13. A system comprising:
a wellhead with a tubular extending therefrom and into a subterranean formation having a filtercake deposited thereon; and
a pump fluidly coupled to the tubular, the tubular comprising a treatment fluid comprising a base fluid and an inclusion complex,
the inclusion complex comprising an acid precursor ester and a cyclodextrin compound and formed by combining an acid precursor ester and a cyclodextrin compound as a solution with stirring for at least two hours, and wherein the inclusion complex delays hydrolysis of the acid precursor ester,
wherein the treatment fluid is brought into contact with the filtercake.

Assignees

• Halliburton Energy Services Inc

Inventors

• Kadam Sunita Sameer
• Kalgaonkar Rajendra Arunkumar

Classifications

• C09K8/72

  Eroding chemicals, e.g. acids · CPC title

• E21B37/00

  Methods or apparatus for cleaning boreholes or wells (E21B21/00 takes precedence) · CPC title

• C09K8/528 Primary

  inorganic depositions, e.g. sulfates or carbonates · CPC title

• E21B21/003

  Means for stopping loss of drilling fluid (plastering the borehole wall E21B33/138) · CPC title

• E21B43/25

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