	US 12,187,957 B2
	Water-based foamed system for perforating zones with low pressure and high temperature
Gustavo Javier García Mendez, Tabasco (MX); Gustavo Regalado Alvarado, Estado de Mexico (MX); Martin Reyes Bautista, Estado de Mexico (MX); and Noé Téllez Reyes, Tabasco (MX)
Assigned to PRO FLUIDOS, S.A. DE C.V., Santa Catarina (MX)
Appl. No. 17/286,345
Filed by PRO FLUIDOS, S.A. DE C.V., Nuevo Leon (MX)
PCT Filed Oct. 18, 2019, PCT No. PCT/IB2019/058919 § 371(c)(1), (2) Date Apr. 16, 2021, PCT Pub. No. WO2020/079666, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. MX/A/2018/012888 (MX), filed on Oct. 19, 2018.
Prior Publication US 2021/0395598 A1, Dec. 23, 2021
Int. Cl. C09K 8/38 (2006.01); C09K 8/14 (2006.01); C09K 8/20 (2006.01); C09K 8/24 (2006.01)

CPC C09K 8/38 (2013.01) [C09K 8/145 (2013.01); C09K 8/206 (2013.01); C09K 8/24 (2013.01); C09K 2208/12 (2013.01)]

12 Claims

1. A composition of a water-based foamed fluid for drilling depressed areas in oil and gas wells, the composition comprising:

(i) a base fluid;

(ii) a stabilizing agent comprising treated montmorillonite;

(iii) a viscosifying agent comprising Xanthan gum with an average molecular weight of 2×10⁶g/mol;

(iv) a filtering reducing agent;

(v) a clay inhibiting agent;

(vi) an alkalizing agent and acid gas sequestering agent;

(vii) a thermal stabilizing agent comprising a polymer derived from an alkali metal salt of 2-acrylamide-2-methyl-propane sulfonic acid; and

(viii) a foaming agent comprising is a mixture of saturated fatty acids of the alkyl group of 10 carbon atoms to 14 carbon atoms with a range of 2 to 8 moles of ethylene oxide,

wherein the composition of the water-based foamed fluid has a thermal stability higher than 180° C.