Subterranean treatment fluid composition and method of treatment

Patent metadata

Field	Value
Publication number	US-9296943-B2
Application number	US-201313900382-A
Country	US
Kind code	B2
Filing date	May 22, 2013
Priority date	May 22, 2012
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A thickened composition comprising a polymer, a divalent ions source, water and cement is disclosed. Such composition enables fluid loss reduction and higher gel strength. This may be useful for treating a well for example as a fluid spacer or a scavenger; this may also be used a hydraulic fracturing fluid.

First claim

What is claimed is:

1. A method, comprising:
adding from 0.1% to 10% by weight cement, and from 4% to 40% by weight of a source of calcium ions selected from the group consisting of calcium oxide, calcium hydroxide and calcium carbonate, to an aqueous treatment fluid containing a polymer, proppant and water, based on the weight of the resulting composition;
increasing the viscosity of the aqueous treatment fluid.

2. The method of claim 1 , wherein the polymer is a polysaccharide.

3. The method of claim 1 , wherein the polymer is present in a concentration of from 0.02% to 1.5% by weight of the composition.

4. The method of claim 1 , wherein the source of cement is a Portland cement, calcium aluminate cement or Sorel cement.

5. The method of claim 2 , wherein the polysaccharide is selected from the group consisting of gellan gum, diutan gum, ramsan gum and derivatives thereof.

6. The method of claim 1 , wherein the polymer is selected from the group consisting of guar gum, xanthan, polyacrylamide, karaya, gum tragacanth, gum ghatti, gum, acacia, gum konjak, hydroxyethyl guar, carboxymethyl hydroxypropyl guar, or carboxymethyl hydroxyl-ethyl guar and mixtures thereof.

7. The method of claim 1 , further comprising:
pumping the aqueous treatment fluid down a well to treat the well.

8. The method of claim 7 , wherein the treatment is hydraulic fracturing.

9. The method of claim 7 , wherein the treatment is a fluid separation.

10. The method of claim 7 , wherein the viscosified treatment fluid comprises diutan, calcium carbonate, the cement and water.

11. The method of claim 10 , wherein the cement is Portland cement.

Assignees

• Schlumberger Technology Corp

Inventors

• Ladva Hemant K J
• Loiseau Anthony

Classifications

• E21B43/267

  reinforcing fractures by propping · CPC title

• C09K8/68 Primary

  containing organic compounds · CPC title

• C09K8/90

  of natural origin, e.g. polysaccharides, cellulose · CPC title

• C09K8/40

  Spacer compositions, e.g. compositions used to separate well-drilling from cementing masses · CPC title

• C09K8/66

  Compositions based on water or polar solvents (C09K8/64 takes precedence) · CPC title