US 12,234,705 B2
Method for applying the scale inhibitor to completion fluids during injectivity test operations
Mario Germino Ferreira Da Silva, Rio de Janeiro (BR); Valtair Marcos Cristante, Rio de Janeiro (BR); Fernando Antonio Moreira Da Silva, Rio de Janeiro (BR); and Ciro Dos Santos Guimaraes, Rio de Janeiro (BR)
Assigned to PETRÓLEO BRASILEIRO S.A.—PETROBRAS, Rio de Janeiro (BR)
Filed by PETRÓLEO BRASILEIRO S.A.—PETROBRAS, Rio de Janeiro (BR)
Filed on Oct. 24, 2023, as Appl. No. 18/493,160.
Claims priority of application No. 1020220216347 (BR), filed on Oct. 25, 2022.
Prior Publication US 2024/0133268 A1, Apr. 25, 2024
Prior Publication US 2024/0229605 A9, Jul. 11, 2024
Int. Cl. E21B 37/06 (2006.01); E21B 49/00 (2006.01)
CPC E21B 37/06 (2013.01) [E21B 49/008 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for applying a scale inhibitor to one or more completion fluids to be used during injectivity test operations, the method comprising
(a) defining a function and a type of one or more completion fluids;
(b) selecting a scale inhibitor compatible with the one or more completion fluids and rock formation;
(c) sizing of a volume of the scale inhibitor to be consumed; and
(d) incorporating the scale inhibitor directly into the one or more completion fluids in a tank or mixer present in a marine rig by:
providing seawater;
pumping, into a reservoir, 20 m3/d of the seawater with between 50 and 20000 ppm of the scale inhibitor for 20 min in a first pumping, followed by monitoring pressures and temperatures of the reservoir during the first pumping;
pumping, into the reservoir, 20 m3/d of the seawater containing 50 to 20,000 ppm of the scale inhibitor for 20 min in a second pumping, followed by monitoring pressures and temperatures of the reservoir during the second pumping;
pumping, into the reservoir, 10 m3/d of the seawater containing 50 to 20,000 ppm the scale inhibitor for 20 min in a third pumping, followed by monitoring of pressures and temperatures of the reservoir during the third pumping; and
pumping, into the reservoir, 10 m3/d of the seawater containing 50 to 20,000 ppm of the scale inhibitor for 20 min in a fourth pumping, followed by monitoring pressures and temperatures of the reservoir during the fourth pumping,
wherein there is a total of 600 bbl of the seawater and scale inhibitor with 4.77 liters to 1900 liters of scale inhibitor in the first, second, third, and fourth pumpings, and
wherein the scale inhibitor comprises organophosphate compounds.