EXHIBIT 21
 SUBSIDIARIES OF THE REGISTRANT
 
 Parker Drilling Company of Oklahoma, Incorporated (Oklahoma)
    
    
    100
    %Parker Technology, Inc. (Oklahoma)
    
    
    100
    %Parker-VSE, Inc. (formerly Vance Systems Engineering, Inc.)
(Nevada)(1)
    
    
    100
    %Parker Drilling Company International Limited (Nevada)(2)
    
    
    100
    %Parker Drilling Company Limited LLC (Delaware)
    
    
    100
    %Parker North America Operations, Inc. (Nevada)(3)
    
    
    100
    %Parker Drilling Company (Bolivia) S.A. (Bolivia)
    
    
    100
    %Universal Rig Service LLC (Delaware)
    
    
    100
    %
  
 (1)
    
    Parker-VSE, Inc. (formerly Vance Systems Engineering, Inc.) owns 100% of Parker Drilling
Company Limited (Bahamas) and 93% of Parker Drilling Company Eastern Hemisphere, Ltd.
(Oklahoma). Parker Drilling Company Limited (Bahamas) owns 7% of Parker Drilling Company
Eastern Hemisphere, Ltd. (Oklahoma).(2)
    
    Parker Drilling Company International Limited owns 100% of Choctaw International Rig Corp.
(Nevada); Creek International Rig Corp. (Nevada) and Parker Drilling Company of Argentina,
Inc. (Nevada). It also owns 65% of Parker Drilling Eurasia, Inc. (Delaware) and 74% of Parker
Drilling Pacific Rim, Inc. (Delaware).(3)
    
    Parker North America Operations, Inc. owns 100% of Parker Drilling Company North America,
Inc. (Nevada); Parker USA Drilling Company (Nevada) and Parker Drilling Offshore Corporation
(Nevada).*
 *
    
    Parker Drilling Offshore Corporation owns 100% of the following entities:
 
    
    Mallard Argentine Holdings, Ltd. (Cayman Islands)
    
    Mallard Drilling of South America, Inc. (Cayman Islands)
    
    Mallard Drilling of Venezuela, Inc. (Cayman Islands)
    
    Parker Drilling Offshore International, Inc. (formerly Mallard Drilling
International, Inc.)(Cayman Islands), which owns 100% of Parker Drilling (Nigeria)
Limited (Nigeria) and 100% of KDN Drilling Limited (Nigeria).
    
    Parker Drilling Offshore USA, L.L.C. (Oklahoma), which owns 100% of Parker
Drilling Company of Mexico, LLC (Nevada), 98% of Parker Drilling de Mexico, SRL
(Mexico), 2% of PD Servicios Integrales, SRL (Mexico) and 100% of Parker Enex, LLC
(Delaware).
    
    Parker Technology, L.L.C. (Louisiana)
    
    Parker Tools, LLC (Oklahoma), which owns 99% of Quail Tools, L.P. (formerly
Quail Tools, L.L.P.) (Oklahoma).
    
    Quail USA, LLC (Oklahoma), which owns 1% of Quail Tools, L.P. (formerly Quail
Tools, L.L.P.) (Oklahoma).
 *
    
    Parker Drilling Offshore Corporation owns 98% of PD Servicios Integrales, SRL (Mexico).*
    
    Parker Drilling Offshore Corporation owns 2% of Parker Drilling de Mexico, SRL
(Mexico).




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SUBSIDIARIES OF THE REGISTRANT (continued)
 *
    
    Parker Drilling Offshore Corporation owns 35% of Parker Drilling Eurasia, Inc.
(Delaware), which owns 100% of Parker Drillserv, LLC (Delaware), 100% of Parker Drilltech,
LLC (Delaware) and 99.96% of PD Offshore Holdings C.V. (Netherlands) which owns 100% of
Parker 3source, LLC (Delaware) and 99.97% of PD Selective Holdings C.V. (Netherlands) which
owns 100% of the following entities:
 
    
    Parker Cyprus Ventures Limited (Cyprus)
    
    Parker Drillex, LLC (Delaware)
    
    Parker Drilling AME Limited (Cayman Islands)
    
    Parker Drilling Company of New Guinea, LLC (Delaware)
    
    Parker Drilling Company of Sakhalin (Russia)
    
    Parker Drilling Company of Singapore, LLC (Delaware)
    
    Parker Drilling Netherlands B.V. (Netherlands)
    
    Parker Drillsource, LLC (Delaware)
    
    PD Labor Sourcing, Ltd. (Cayman Islands)
    
    PD Personnel Services, Ltd. (Cayman Islands) and 99.9% of Parker Drilling
Company Kuwait Limited (Bahamas).
 *
    
    Parker Drilling Offshore Corporation owns 26% of Parker Drilling Pacific Rim, Inc.
(Delaware), which owns 100% of Parker Rigsource, LLC (Delaware) and 99% of PD International
Holdings C.V. (Netherlands) which owns 100% of Parker 5272, LLC (Delaware) and 99.96% of PD
Dutch Holdings C.V. (Netherlands) which owns 100% of the following entities:
 
    
    Parker Cyprus Leasing Limited (Cyprus)
    
    Parker Drilling (Kazakstan), LLC (Delaware)
    
    Parker Drilling Company International, LLC (Delaware)
    
    Parker Drilling Company of New Zealand Limited (New Zealand)
    
    Parker Drilling Dutch B.V. (Netherlands)
    
    Parker Drilling International of New Zealand Limited (New Zealand)