US 11,866,641 B2
Method for fracking subterranean geological formation with surfactant-containing fluid
S. M. Shakil Hussain, Dhahran (SA); and Muhammad Shahzad Kamal, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Dec. 23, 2022, as Appl. No. 18/146,205.
Application 18/146,205 is a continuation of application No. 16/749,342, filed on Jan. 22, 2020, granted, now 11,555,143.
Claims priority of provisional application 62/910,856, filed on Oct. 4, 2019.
Prior Publication US 2023/0138419 A1, May 4, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 8/68 (2006.01); C09K 8/584 (2006.01); C07C 229/12 (2006.01); C07C 305/04 (2006.01); C09K 8/06 (2006.01); C07C 305/10 (2006.01)
CPC C09K 8/584 (2013.01) [C07C 229/12 (2013.01); C07C 305/04 (2013.01); C07C 305/10 (2013.01); C09K 8/06 (2013.01); C09K 8/68 (2013.01)] 15 Claims
 
1. A method of fracking a subterranean geologic formation, comprising:
injecting an oil and gas well servicing fluid into an oil and gas well in the subterranean geologic formation,
wherein the injecting is at a pressure above the fracture point of the subterranean geologic formation;
wherein the oil and gas well servicing fluid comprises:
an aqueous base fluid; and
a surfactant of formula (I)

OG Complex Work Unit Chemistry
wherein:
each of R1 and R2 are independently H or an optionally substituted C1 to C6 alkyl,
R3 and R4 are independently an optionally substituted C1 to C6 alkyl;
x is 6;
y is an integer in a range of from 7 to 10;
z is 6;
n is an integer in a range of from 3 to 4;
A is an anionic headgroup selected from the group consisting of

OG Complex Work Unit Chemistry
wherein the oil and gas well servicing fluid has a total dissolved solids content in a range of from 50,000 to 350,000 ppm,
wherein the surfactant is present in a range of from 0.045 to 2 wt. %, relative to a total weight of the oil and gas well servicing fluid,
wherein the surfactant has a number average molecular weight in a range of from 600 to 1200 g/mol, and
wherein, during the injecting, the surfactant has a concentration in a range of from 3×10−5 to 5×10−4 M.