In-situ downhole heating for a treatment in a well

Patent metadata

Field	Value
Publication number	US-9657552-B2
Application number	US-201313928510-A
Country	US
Kind code	B2
Filing date	Jun 27, 2013
Priority date	Jun 27, 2013
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The invention provides methods for treating a portion or treatment zone of a well that include introducing one or more treatment fluids into the well, wherein the one or more treatment fluids include: (i) a first reactant and a second reactant, wherein the first reactant and second reactant are selected for being capable of reacting together in an exothermic chemical reaction, and wherein the first and second reactant are in at least sufficient concentrations in the carrier fluid to generate a theoretical heat of reaction of at least 500 kJ/liter of at least one of the treatment fluids; and (ii) a treatment chemical in at least one of the treatment fluids, wherein the treatment chemical is selected for chemically reacting with a substance of a material in the portion or treatment zone of the well. The exothermic reactants and the treatment chemical can be introduced in a single treatment fluid or in separate treatment fluids.

First claim

What is claimed is:

1. A method for treating a treatment zone of a well, the method comprising the steps of:
(A) forming a first treatment fluid comprising:
(i) a first carrier fluid; and
(ii) a first reactant and a second reactant, wherein the first reactant and second reactant are selected for being capable of reacting together in an exothermic chemical reaction, and wherein the first and second reactant are in at least sufficient concentrations in the carrier fluid to generate a theoretical heat of reaction of at least 500 kJ/liter of the treatment fluid;
wherein the volume of the first treatment fluid is equal to or greater than about 10 m 3 ;

(B) forming a second treatment fluid comprising:
(i) a second carrier fluid; and
(ii) a treatment chemical dissolved or suspended in the second carrier fluid, wherein the treatment chemical comprises a chelating agent selected for forming chemical bonds with or for breaking of chemical bonds in a substance of a material in the treatment zone of the well;

(C) introducing the first treatment fluid and the second treatment fluid in any sequential order into the treatment zone of the well, wherein the treatment zone comprises an acid-sensitive formation and the treatment zone is at a temperature of 250° F. (121° C.) or lower prior to introducing the first and second treatment fluids;
(D) allowing the chelating agent to chemically react with an acid-sensitive formation or inorganic scale in the treatment zone; and
(E) introducing a treatment fluid different from the first and second treatment fluids into the treatment zone within less than an hour of step (C),
thereby, without requiring a shut in of more than one hour between step (C) and step (E), increasing permeability of the acid-sensitive formation or removing inorganic scale in the treatment zone.

2. The method according to claim 1 , wherein the treatment zone of the well is a sandstone formation.

3. The method according to claim 1 , wherein the chelating agent is selected from the group consisting of: glutamic acid diacetic acid, methylglycine diacetic acid, β-alanine diacetic acid, ethylenediaminedisuccinic acid, S,S-ethylenediaminedisuccinic acid, iminodisuccinic acid, hydroxyiminodisuccinic acid, polyamino disuccinic acids, N-bis[2-(1,2-dicarboxyethoxy)ethyl]glycine, N-bis[2-(1,2-dicarboxyethoxy)ethyl]aspartic acid, N-bis[2-(1,2-dicarboxyethoxy)ethyl]methylglycine, N-tris[(1,2-dicarboxyethoxy)ethyl]amine, N-methyliminodiacetic acid, iminodiacetic acid, N-(2-acetamido)iminodiacetic acid, hydroxymethyl-iminodiacetic acid, 2-(2-carboxyethylamino)succinic acid, 2-(2-carboxymethylamino)succinic acid, diethylenetriamine-N,N″-disuccinic acid, triethylenetetramine-N,N′″-disuccinic acid, 1,6-hexamethylenediamine-N,N′-disuccinic acid, tetraethylenepentamine-N,N″″-disuccinic acid, 2-hydroxypropylene-1,3-diamine-N,N′-disuccinic acid, 1,2-propylenediamine-N,N′-disuccinic acid, 1,3-propylenediamine-N,N′-disuccinic acid, cis-cyclohexanediamine-N,N′-disuccinic acid, trans-cyclohexanediamine-N,N′-disuccinic acid, ethylenebis(oxyethylenenitrilo)-N,N′-disuccinic acid, glucoheptanoic acid, cysteic acid-N,N-diacetic acid, cysteic acid-N-monoacetic acid, alanine-N-monoacetic acid, N-(3-hydroxysuccinyl)aspartic acid, N-[2-(3-hydroxysuccinyl)]-L-serine, aspartic acid-N,N-diacetic acid, aspartic acid-N-monoacetic acid, any salt thereof, any derivative thereof, and any combination thereof.

4. The method according to claim 1 , wherein the first and second treatment fluids are not heated prior to the step of introducing.

5. The method according to claim 1 , wherein the contact time of the first and second treatment fluids with the treatment zone of the well is controlled to be shorter than would be required for an otherwise treatment without the first fluid.

6. The method according to claim 1 , wherein the first reactant comprises ammonium ions and the second reactant comprises nitrite ions.

7. The method according to claim 1 , wherein at least some of at least one of the first reactant and the second reactant is suspended in a solid form in the carrier fluid, and the solid form is further adapted to help control the mixing between the first reactant and the second reactant.

8. The method according to claim 1 , wherein the first and second treatment fluids are introduced adjacent to each other without an intermediate treatment fluid between the first and second treatment fluids.

9. The method according to claim 1 , wherein the first treatment fluid and the second treatment fluid are alternatingly introduced into the well.

10. The method according to claim 9 , wherein a total volume of the first treatment fluid that is alternatingly introduced is greater than about 16 m 3 .

11. The method according to claim 1 , wherein the treatment zone is at a temperature of 220° F. (104° C.) or lower prior to introducing the first and second treatment fluids.

Assignees

• Halliburton Energy Services Inc

Inventors

• Choudhary Yogesh Kumar
• Oftedal Arve

Classifications

• E21B43/24

  using heat, e.g. steam injection · CPC title

• C09K8/592

  Compositions used in combination with generated heat, e.g. by steam injection · CPC title

• C09K8/74

  combined with additives added for specific purposes · CPC title

• C09K8/68

  containing organic compounds · CPC title

• E21B36/008 Primary

  using chemical heat generating means · CPC title