Compositions and systems for combatting lost circulation and methods

Patent metadata

Field	Value
Publication number	US-9518210-B2
Application number	US-201213460266-A
Country	US
Kind code	B2
Filing date	Apr 30, 2012
Priority date	Nov 18, 2009
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

A method of servicing a wellbore in a subterranean formation comprising placing a first stream comprising a dilute solution of a metal acrylate into a lost circulation zone in the subterranean formation; placing a second stream comprising an activator into the lost circulation zone; and forming a lost circulation material upon contacting of the metal acrylate and the activator, wherein the lost circulation material forms in from about 0 to about 60 minutes. A method of servicing a wellbore in a subterranean formation comprising placing a composition comprising a dilute solution of a cross-linkable material and an encapsulated activator into a lost circulation zone in the subterranean formation; and allowing the composition to set.

First claim

What is claimed is:

1. A method of servicing a wellbore in a subterranean formation comprising:
introducing a first component of a lost circulation combating composition within a drilling fluid, wherein the first component comprises a gellable composition in an amount from about 0.2 weight percent (wt. %) to about 30 wt. % of the lost circulation combating composition and the drilling fluid is circulated through the wellbore during drilling operations;
introducing a second component of the lost circulation combating composition into the wellbore via a flowpath separate from the flowpath by which the drilling fluid is circulated; and
forming the lost circulation combating composition within a lost circulation zone;
wherein the second component comprises an initiator; and
wherein the gellable composition comprises polymerizable monomers that include:
a metal acrylate; and
a cross-linking multifunctional monomer present in an amount from about 0.01 wt. % to about 5 wt. % by weight of the polymerizable monomers, the cross-linking multifunctional monomer being selected from the group consisting of ethylene bisacrylamide, methylene bisacrylamide, trimethylol propane triacrylate, trimethylol propylene diacrylate, ethyleneglycol triacrylate, pentaerythrytol triacrylate, pentaerythrytol diacrylate, triallylcyanurate, and combinations thereof; and

wherein the lost circulation combating composition further comprises a polymerization rate moderator selected from the group consisting of morpholine, tetramethylethylenediamine, polyethylenimine, triethanolamine, and ammonium carbonate, the polymerization rate moderator being present in an amount from about 3 wt. % to about 25 wt. % by weight of the drilling fluid.

2. The method of claim 1 , wherein the initiator comprises: a mixture of an alkanolamine and a persulfate; an azo initiator; or a combination thereof.

3. The method of claim 1 , wherein the metal acrylate comprises a calcium salt of acrylic acid, a magnesium salt of acrylic acid, a calcium salt of methacrylic acid, a magnesium salt of methacrylic acid, or combinations thereof.

4. The method of claim 1 , wherein the initiator comprises 2,2′-azobis(2-(2-imidazolin-2-yl)propane) dihydrochloride or 2,2′-azobis(2-methyl-N-2-hydroxyethyl)propionamide.

5. The method of claim 1 , wherein the initiator comprises an organic peroxide or organic hydroperoxide.

6. The method of claim 1 , wherein the initiator comprises benzoyl peroxide or tert-butyl hydroperoxide.

7. The method of claim 1 , wherein the initiator comprises sodium persulfate (Na 2 S 2 O 8 ), ammonium persulfate, sodium percarbonate (Na 2 CO 3 ), sodium perborate (NaBO 3 ), or a combination thereof.

8. The method of claim 1 , wherein the initiator is encapsulated.

Assignees

• Ezell Ryan G
• Reddy B Raghava
• Halliburton Energy Services Inc

Inventors

• Ezell Ryan G
• Reddy B Raghava

Classifications

• C09K8/5045 Primary

  containing inorganic compounds · CPC title

• C09K8/512

  containing cross-linking agents · CPC title

• C09K8/508

  macromolecular compounds {(C09K8/512 takes precedence)} · CPC title