Polymer blends for stimulation of oil & gas wells
A copolymer and well treatment technology, applied in the direction of drilling composition, wellbore/well components, production fluid, etc., can solve problems such as formation damage
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example 2-V
[0051] Example 2 - VPA Copolymer.
[0052] Several VPA-containing copolymers (Table 2) were synthesized and their viscosity properties investigated.
[0053] Table 2. VPA copolymers.
[0054]
[0055] A 1% VPA-1 copolymer solution was prepared by dissolving 5 g of the VPA-1 copolymer emulsion in 500 ml of deionized water. Then, 0.15 g of sodium bicarbonate and 0.5 ml of a 50% choline chloride solution were added. 0.5 ml of ethoxylated surfactant was added as inversion surfactant. The solution was mixed slowly until the polymer was completely dissolved. The viscosity of the polymer solution was 15 cP (measured at 51 l / sec using an OFITE model 900 viscometer).
[0056] The polymer solution was crosslinked by adding 0.2 ml of 30% sodium thiosulfate solution to 100 ml of polymer solution, adjusting the pH to about 7.6, followed by adding 0.075 ml of zirconium lactate crosslinker (5% Zr) . The resulting solution was transferred to a HTHP viscometer and heated to 275°F. Vi...
example 1
[0067] Examples 1 and 2 demonstrate the incorporation of even small amounts of vinylphosphonic acid in acrylamide copolymers after the crosslinker has been added compared to polyacrylamide (Example 1) where there is no significant increase in viscosity after the addition of the crosslinker (Example 2) Significantly increased viscosity.
example 3
[0068] Example 3 - VPA-3 pH study.
[0069] A 1% VPA-3 copolymer solution was prepared by dissolving 5 g of the VPA-3 copolymer emulsion in 500 ml of deionized water. Then, 0.15 g of sodium bicarbonate and 0.5 ml of a 50% choline chloride solution were added. 0.5 ml of ethoxylated surfactant was added as inversion surfactant. The solution was mixed slowly until the polymer was completely dissolved. The viscosity of the polymer solution was 15-16 cP (measured at 511 / sec using an OFITE model 900 viscometer).
[0070] The polymer solution was crosslinked by adding 0.2 ml of 30% sodium thiosulfate solution to 100 ml of polymer solution, adjusting the pH to about 4.7, followed by adding 0.1 ml of zirconium lactate crosslinker (5% Zr) . The resulting solution was transferred to a HTHP viscometer and heated to 275°F. Viscosity is measured as a function of time and temperature. The results are presented in Table 6.
[0071] Table 6. Viscosity measurements of crosslinked VPA-3 c...
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