Exhibit 21.1

Flotek Industries, Inc.

List of Subsidiaries

CESI Chemical, Inc.

Formerly: Chemical & Equipment Specialties, Inc.

Oklahoma Corporation

DBA: CESI Chemical, Inc.

Esses, Inc.

Oklahoma Corporation

DBA: CESI Chemical, Inc.

Plainsman Technology, Inc.

Oklahoma Corporation

DBA: CESI Chemical, Inc

Equipment Specialties, Inc.

Oklahoma Corporation

DBA: Equipment Specialties, Inc.

Material Translogistics, Inc.

Texas Corporation

DBA: Material Translogistics, Inc.

Padko International, Inc.

Oklahoma Corporation

DBA: CESI Chemical, Inc.

Petrovalve International, Inc.

Alberta Corporation

DBA: Petrovalve International, Inc.

Petrovalve, Inc.

Delaware Corporation

USA Petrovalve, Inc.

Texas Corporation

DBA: USA Petrovalve, Inc.

Turbeco, Inc.

Texas Corporation

DBA: Turbeco, Inc.

DBA: Precision-LOR LP.

Trinity Tool, Inc.

Texas Corporation

DBA: Trinity Tool, Inc.

Petrovalve Int’l (Barbados), Inc.

Barbados Corporation

DBA: Petrovalve Int’l (Barbados), Inc.

Flotek Paymaster, Inc.

Texas Corporation

DBA: Flotek Paymaster, Inc.

Spidle Sales & Services, Inc.

Utah Corporation

DBA: Spidle Sales & Services, Inc.

Harmon Machine Works, Inc.

Texas Corporation

DBA: Galleon Enterprise and
Midessa Heat Treat