Electrically powered well servicing rigs

Abstract

A mobile land rig for use in wellbore operations. The mobile land rig, in certain aspects, has a vehicle; an erectable mast; winch apparatus (e.g., one or two winches); and electric motor apparatus for powering the winch apparatus. In one aspect there are two winches and one electric motor powers both winches. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 CFR 1.72(b).

1 . A mobile land rig for use in wellbore operations, the mobile land rig comprising
 a vehicle,   an erectable mast on the vehicle,   winch apparatus on the vehicle,   electric motor apparatus on the vehicle for powering the winch apparatus.   
   
   
       2 . The mobile land rig of  claim 1  wherein
 the winch apparatus includes a main winch and a sandline winch.   
   
   
       3 . The mobile land rig of  claim 1  wherein
 the electric motor apparatus is a single electric motor.   
   
   
       4 . The mobile land rig of  claim 1  wherein
 the winch apparatus includes a main winch and a sandline winch,   the electric motor apparatus is a single electric motor, and   both the main winch and the sandline winch powered by the single electric motor.   
   
   
       5 . The mobile land rig of  claim 4  wherein
 the single electric motor has two drive shafts, a first drive shaft and a second drive shaft,   the first drive shaft for driving the main winch, and   the second drive shaft for driving the sandline winch.   
   
   
       6 . The mobile land rig of  claim 4  wherein
 the single electric motor has a single drive shaft,   the main winch driven by the single drive shaft, and   the sandline winch driven by the single drive shaft.   
   
   
       7 . The mobile land rig of  claim 6  further comprising
 shifting mechanism for selectively driving the main winch or the sandline winch.   
   
   
       8 . The mobile land rig system of  claim 1  wherein the mobile land rig is a well servicing rig or a workover rig. 
   
   
       9 . The mobile land rig system of  claim 1  wherein the electric motor apparatus provides braking while the winch apparatus lowers a load. 
   
   
       10 . The mobile land rig of  claim 1  further comprising
 mast erection apparatus which is electrically powered.   
   
   
       11 . The mobile land rig system of  claim 10  wherein the mast erection apparatus includes an electric winch system. 
   
   
       12 . The mobile land rig system of  claim 1  further comprising
 vehicle levelling apparatus which is electrically powered.   
   
   
       13 . The mobile land rig system of  claim 12  wherein the vehicle levelling apparatus includes an electrically-operated ball screw unit. 
   
   
       14 . The mobile land rig system of  claim 1  further comprising
 a computerized control system for controlling the electric motor apparatus.   
   
   
       15 . The mobile land rig system of  claim 1  wherein the electric motor apparatus is at least one electric motor which is one of AC induction motor, DC motor, permanent magnet motor, and a printed circuit board permanent magnet motor. 
   
   
       16 . The mobile land rig system of  claim 1  further comprising
 a power source for the electric motor apparatus.   
   
   
       17 . The mobile land rig system of  claim 16  wherein the power source is one of local utility, battery, power storage apparatus, and generator. 
   
   
       18 . The mobile land rig system of  claim 1  further comprising
 a control system in controlling communication with the electric motor apparatus and the winch apparatus, and   an operator panel in communication with the control system whereby an operator can control the electric motor apparatus and the winch apparatus.   
   
   
       19 . A mobile land rig for use in wellbore operations, the mobile land rig comprising
 a vehicle,   an erectable mast on the vehicle,   winch apparatus on the vehicle,   electric motor apparatus on the vehicle for powering the winch apparatus and for providing braking while the winch apparatus lowers a load,   wherein the winch apparatus includes a main winch and a sandline winch,   the electric motor apparatus is a single electric motor,   both the main winch and the sandline winch powered by the single electric motor,   shifting mechanism for selectively driving the main winch or the sandline winch,   a computerized control system for controlling the electric motor apparatus and the winch apparatus,   a power source for the electric motor apparatus, and   an operator panel in communication with the control system whereby an operator can control the electric motor apparatus and the winch apparatus.   
   
   
       20 . The mobile land rig of  claim 19  wherein
 the single electric motor has two drive shafts, a first drive shaft and a second drive shaft,   the first drive shaft for driving the main winch, and   the second drive shaft for driving the sandline winch.   
   
   
       21 . A method for performing wellbore operations with a mobile land rig, the method comprising
 erecting a mast on a vehicle of a mobile land rig, the mobile land rig including winch apparatus on the vehicle and electric motor apparatus on the vehicle for powering the winch apparatus, and   winching an item with the winching apparatus.   
   
   
       22 . A winch system for a mobile land rig, the winch system comprising
 winch apparatus mountable on a vehicle of a mobile land rig, and   electric motor apparatus mountable on the vehicle in driving relationship with the winch apparatus for powering the winch apparatus.   
   
   
       23 . A method for winching an item on a mobile land rig, the method comprising
 attaching the item to a winch apparatus, the winch apparatus mounted on a vehicle of a mobile land rig, and   winching the item with the winch apparatus, the winch apparatus powered by electric motor apparatus.