US 12,286,879 B2
Oil field chemical release system
Lauren Adamson, Cleveland (GB); Chun-tian Zhao, Cleveland (GB); and Karen Waterman, Cleveland (GB)
Assigned to TRACERCO LIMITED, London (GB)
Appl. No. 17/759,317
Filed by TRACERCO LIMITED, London (GB)
PCT Filed Feb. 11, 2021, PCT No. PCT/GB2021/050337
§ 371(c)(1), (2) Date Jul. 22, 2022,
PCT Pub. No. WO2021/219973, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 2006357 (GB), filed on Apr. 30, 2020; and application No. 2010201 (GB), filed on Jul. 3, 2020.
Prior Publication US 2023/0117956 A1, Apr. 20, 2023
Int. Cl. E21B 47/11 (2012.01)
CPC E21B 47/11 (2020.05) 17 Claims
 
1. An oil field chemical release system for controlled release of an oil field chemical within a hydrocarbon reservoir, well, or wellbore, the oil field chemical release system comprising:
a plurality of microcapsules, each microcapsule comprising an oil field chemical and a microencapsulant, wherein the oil field chemical is contained within the microencapsulant; and
a continuous bulk polymer matrix, wherein the plurality of microcapsules are disposed within the continuous bulk polymer matrix,
wherein the oil field chemical release system is configured to allow the oil field chemical to move through the microencapsulant into the continuous bulk polymer matrix and through the continuous bulk polymer matrix to be released through a surface of the bulk polymer matrix into the hydrocarbon reservoir, well, or wellbore at a controlled rate,
wherein the oil field chemical release system is configured to provide a release profile, calculated as a weight percentage of an initial oil field chemical content of the chemical release system, in a range 0.01 to 8.3 wt % per month for a time period of at least 1 year at a target temperature in a range −45° C. to 300° C.,
wherein the continuous bulk polymer matrix is an epoxy resin system comprising at least two different epoxy monomers which are chemically bonded to form a co-polymer,
wherein the microencapsulant comprises a co-polymer formed of at least two different monomers which are chemically bonded to form the co-polymer, and
wherein the at least two different epoxy monomers in the epoxy resin system comprise at least two different epoxy ether monomers.