US 11,898,431 B2
Methods and systems for treating hydraulically fractured formations
Tadd Wallace, Osceola, MO (US); Kevin Lange, Houston, TX (US); Dave Szabo, Anchorage, AL (US); Susan Starr, Anchorage, AK (US); and Andrea Balestrini, Sugar Land, TX (US)
Assigned to Universal Chemical Solutions, Inc., Austin, TX (US)
Filed by Universal Chemical Solutions, Inc., Dripping Springs, TX (US)
Filed on Sep. 28, 2021, as Appl. No. 17/488,029.
Claims priority of provisional application 63/084,645, filed on Sep. 29, 2020.
Claims priority of provisional application 63/084,653, filed on Sep. 29, 2020.
Claims priority of provisional application 63/084,659, filed on Sep. 29, 2020.
Prior Publication US 2022/0145741 A1, May 12, 2022
Int. Cl. E21B 43/267 (2006.01); C09K 8/68 (2006.01); C09K 8/80 (2006.01); E21B 43/26 (2006.01)
CPC E21B 43/267 (2013.01) [C09K 8/68 (2013.01); C09K 8/80 (2013.01); E21B 43/2605 (2020.05)] 17 Claims
OG exemplary drawing
 
1. A method for treating a hydrocarbon-bearing formation previously subjected to hydraulic fracturing comprising:
(a) pumping into a wellbore a non-emulsified treatment composition comprising liquefied petroleum gas (LPG), one or more surfactants, a non-emulsifier, and a defoamer; wherein the non-emulsified treatment composition contains no separately added water;
(b) causing the treatment composition to make contact with water residing in the formation such that no emulsion is formed with the water residing in the formation,
(c) recovering a non-emulsified production composition that includes (i) residual hydrocarbons, (ii) a portion of the LPG that was previously pumped into the wellbore in step (a), (iii) a portion of the water that resided in the formation and (iv) a portion of the one or more surfactants that were pumped into the wellbore in step (a).