| 摘要 |
A method of managing invoices for goods services provided by several contractors working at a remote well site involves entering invoice data into a mobile computer at the well site and transmitting the data over a wireless communication link to a home base computer. In some forms of the invention, the invoice data is validated by transducer-generated data, which is produced by a transducer that senses a service operation (e.g., replacing sucker rods) being performed at the well site. Passwords prevent unauthorized use. Some information displayed on the computer at the well site reassures the contractors that the computers are communicating. The method is particularly useful when the contactors are independent contractors using different service vehicles in performing significantly different service operations.
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