**Exhibit 21.1**

**Subsidiaries of Universal Compression Holdings,Inc.**
| Beijing Universal  Compression Technical Services Company Ltd. |   | China               |
|----------------------------------------------------------------|--------|---------------------|
| Compression  Services de Mexico, S.A. de C.V.                  |   | Mexico              |
| Compressor  Systems International, Inc.                        |   | Delaware            |
| Energy Dynamics  de Venezuela, C.A.                            |   | Venezuela           |
| Enterra  Compression Investment Company                        |   | Delaware            |
| Excel Energy  Services Limited                                 |   | Nigeria             |
| Oceanic  Compression Services Pty Ltd                          |   | Australia           |
| Probalance  Engenharia Ltda.                                   |   | Brazil              |
| PT Universal Compression  Indonesia                            |   | Indonesia           |
| Quimex S.A.                                                    |   | Switzerland         |
| UC Canadian Partnership Holdings Company                       |   | Nova Scotia, Canada |
| UC Canadian  Partnership Minority Holdings Company             |   | Nova Scotia, Canada |
| UC Operating  Partnership, L.P.                                |   | Delaware            |
| UCI Compressor  Holding, L.P.                                  |   | Delaware            |
| UCI GP LP LLC                                                  |   | Delaware            |
| UCI Leasing  Holding GP LLC                                    |   | Delaware            |
| UCI Leasing  Holding LP LLC                                    |   | Delaware            |
| UCI MLP LP LLC                                                 |   | Delaware            |
| UCLP Leasing GP  LLC                                           |   | Delaware            |
| UCLP Leasing,  L.P.                                            |   | Delaware            |
| UCLP OLP GP LLC                                                |   | Delaware            |
| UCO Compression  2005 LLC                                      |   | Delaware            |
| UCO Compression  Holding, L.L.C.                               |   | Delaware            |
| UCO General  Partner, LP                                       |   | Delaware            |
| UCO GP, LLC                                                    |   | Delaware            |
| Universal  Compression (Australia) Pty Ltd                     |   | Australia           |
| Universal  Compression (Thailand), Ltd.                        |   | Thailand            |
| Universal  Compression Argentina S.A.                          |   | Argentina           |
| Universal  Compression B.V.                                    |   | The Netherlands     |
| Universal  Compression Bolivia Ltda.                           |   | Bolivia             |
| Universal  Compression Canada, Limited Partnership             |   | Nova Scotia, Canada |
| Universal  Compression Canadian Holdings, Inc.                 |   | Delaware            |
| Universal  Compression de Mexico, S.A. de C.V.                 |   | Mexico              |
| Universal  Compression de Venezuela Unicom, C.A.               |   | Venezuela           |
| Universal  Compression del Peru S.R.L.                         |   | Peru                |
| Universal Compression  Finance Company Ltd.                    |   | Barbados            |
| Universal  Compression International Holdings, S.L.U.          |   | Spain               |
| Universal  Compression International Ltd.                      |   | Cayman Islands      |
| Universal  Compression International, Inc.                     |   | Delaware            |
| Universal  Compression Ltda.                                   |   | Brazil              |
| Universal  Compression of Colombia Ltd.                        |   | Cayman Islands      |
| Universal  Compression Partners, L.P.                          |   | Delaware            |
| Universal  Compression Services de Venezuela, C.A.             |   | Venezuela           |
| Universal  Compression Services, LLC                           |   | Delaware            |
| Universal  Compression Singapore Pte. Ltd.                     |   | Singapore           |
| Universal  Compression Trade Holdings ULC                      |   | Alberta, Canada     |
| Universal  Compression, Inc.                                   |   | Texas               |
| Uniwhale de  Colombia E.U.                                     |   | Colombia            |
| Uniwhale Ltd.                                                  |   | Cayman Islands      |

 

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