Gelling compositions useful for oil field applications
AssigneePhillips Petroleum Company
InventorAhmad Moradi-Araghi
Life of this patent
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Abstract
A gelling composition and a process for wellbore treatment comprising injecting the composition into reservoirs are disclosed wherein the composition comprise a produced brine; a water-soluble polymer such as, for example, polyacrylamide; a crosslinker such as, for example, a complexed zirconium compound; and optionally a complexing ligand such as, for example, lactic acid.
Claims40
A process for wellbore treatment consisting essentially of:
- (1) producing a produced brine which is a recovered brine which is coproduced and contaminated with oil or gas or both;
- (2) preparing a composition consisting essentially of said produced brine, a water-soluble polymer, a complexing ligand, and a crosslinker;
- and (3) injecting said composition to said wellbore wherein said complexing ligand is selected from the group consisting of lactic acid, neutralized lactic acid, citric acid, ammonium citrate, sodium citrate, potassium citrate, isocitric acid, ammonium isocitrate, sodium citrate, potassium citrate, tartaric acid, ammonium tartrate, sodium tartrate, potassium tartrate, triethanolamine, malonic acid, ammonium malonate, sodium malonate, potassium malonate, and mixtures thereof;
- and said crosslinker is selected from the group consisting of complexed zirconium compounds, complexed titanium compounds, and combinations thereof.
A process for near-wellbore treatment comprising the steps of:
- (1) producing a produced brine which is a recovered brine which is coproduced and contaminated with oil or gas or both;
- (2) injecting said produced brine, a partially hydrolyzed polyacrylamide, zirconium lactate, and lactic acid into a reservoir wherein the concentration of partially hydrolyzed polyacrylamide in said produced brine is in the range of from 200 ppm to 5,000 ppm;
- the concentration of zirconium lactate in said produced brine is in the range of from 100 ppm to 2,000 ppm zirconium;
- the concentration of lactic acid in said produced brine is in the range of from 100 ppm to 2,000 ppm;
- and said produced brine has a salinity of 4% to 25% total dissolved solids.
A composition consisting essentially of a produced brine, a water soluble polymer, a complexing ligand, and a crosslinker wherein said produced brine is a recovered brine which is coproduced and contaminated with oil or gas or both;
- said complexing ligand is selected from the group consisting of lactic acid, neutralized lactic acid, citric acid, ammonium citrate, sodium citrate, potassium citrate, isocitric acid, ammonium isocitrate, sodium citrate, potassium citrate, tartaric acid, ammonium tartrate, sodium tartrate, potassium tartrate, triethanolamine, malonic acid, ammonium malonate, sodium malonate, potassium malonate, and mixtures thereof;
- and said crosslinker is selected from the group consisting of complexed zirconium compounds, complexed titanium compounds, and combinations thereof.
A composition useful for wellbore treatment consisting essentially of a produced brine, a partially hydrolyzed polyacrylamide, zirconium lactate, and lactic acid wherein the concentration of said partially hydrolyzed polyacrylamide in said produced brine is in the range of from 200 ppm to 5,000 ppm;
- the concentration of zirconium lactate in said produced brine is in the range of from 100 ppm to 2,000 ppm zirconium;
- the concentration of lactic acid in said produced brine is in the range of from 100 ppm to 2,000 ppm;
- and said produced brine is a recovered brine which is coproduced with oil or gas or both and has a salinity of 4% to 25% total dissolved solids.
Dependencies are inferred from the claim text.