# US 9,518,210 B2 · Compositions and systems for combatting lost circulation and methods

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,518,210 B2
- Document ID: US9518210B2
- Status: Granted
- Kind: B2
- Application number: 13/460,266
- Filed: 2012-04-30
- Published: 2012-11-29
- Granted: 2016-12-13
- Earliest claimed: 2009-11-18
- Assignees: Halliburton Energy Services, Inc.
- Applicants: Ryan G. Ezell; B. Raghava Reddy
- Inventors: Ryan G. Ezell; B. Raghava Reddy
- Web page: https://patentgrep.com/patent/US9518210B2

## CPC

- C09K 8/5045: {containing inorganic compounds}
- C09K 8/508: macromolecular compounds {(C09K8/512 takes precedence)}
- C09K 8/512: containing cross-linking agents
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

The method of claim 1, wherein the initiator comprises sodium persulfate (Na2S2O8), ammonium persulfate, sodium percarbonate (Na2CO3), sodium perborate (NaBO3), or a combination thereof.

### Claim 8 (depends on 1)

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