Cement compositions containing metphosphate and methods of use

Patent metadata

Field	Value
Publication number	US-9038722-B2
Application number	US-201313909232-A
Country	US
Kind code	B2
Filing date	Jun 4, 2013
Priority date	Oct 15, 2012
Publication date	May 26, 2015
Grant date	May 26, 2015

Abstract

In an embodiment, the cement compositions comprise: (i) hydraulic cement, wherein the hydraulic cement has a ratio of CaO to SiO2 in the range of 2.0 to 4.0; and (ii) a water-soluble metaphosphate in a concentration of at least 2.5% bwoc. In another embodiment, the cement compositions comprise: (i) hydraulic cement, wherein the hydraulic cement has a ratio of CaO to SiO 2 of less than 2.0; and (ii) a water-soluble metaphosphate; wherein any alkali nitrate is in a concentration of less than 2% bwoc; and wherein any alkali hydroxide, alkali carbonate, or alkali citrate is in a concentration of less than 0.2% bwoc. Methods of cementing in a well comprising forming either of such cement compositions and introducing it into the well are provided.

First claim

What is claimed is:

1. A method of cementing a treatment zone of a well, the method comprising the steps of:
(A) forming a cement composition comprising:
(i) hydraulic cement, wherein the hydraulic cement has a ratio of CaO to SiO 2 in the range of 2.0 to 4.0;
(ii) a water-soluble metaphosphate in a concentration of at least 2.5% bwoc; and
(iii) water; and

(B) introducing the cement composition into the well.

2. The method according to claim 1 , wherein the metaphosphate comprises a hexametaphosphate.

3. The method according to claim 1 , wherein the metaphosphate is selected from the group consisting of an alkali metal metaphosphate, an ammonium metaphosphate, and any combination thereof.

4. The method according to claim 1 , wherein the metaphosphate is in a concentration of less than 10% bwoc.

5. The method according to claim 1 , wherein any alkali nitrate is in a concentration of less than 2% bwoc.

6. The method according to claim 1 , wherein any alkali hydroxide, alkali carbonate, or alkali citrate is in a concentration of less than 0.2% bwoc.

7. The method according to claim 1 , wherein any calcium aluminoferrite is in a concentration of less than 15% bwoc.

8. The method according to claim 1 , wherein the design temperature is in the range of 100° F. to 170° F.

Assignees

• Halliburton Energy Services Inc

Inventors

• Patil Rahul Chandrakant
• Patil Sandip Prabhakar
• Bose Sohini
• Santra Ashok K
• Balaraman Balasundaram

Classifications

• C09K8/48

  Density increasing or weighting additives · CPC title

• C04B2103/0035

  Type G · CPC title

• C09K8/467

  containing additives for specific purposes · CPC title

• C04B2111/00215

  Mortar or concrete mixtures defined by their oxide composition · CPC title

• E21B33/138

  Plastering the borehole wall; Injecting into the formation · CPC title