| 摘要 |
Enhancements to a drill motor include a bearing pack assembly, a balancing piston, a recording transducer package (RTP), and a latch rod assembly for a drill motor to improve performance and reliability of a drill motor. The bearing pack assembly includes a bearing housing coupled to an end cap and a drive shaft extending into the end cap and the bearing housing. The bearing pack assembly also includes a thrust bearing disposed within the bearing housing, wherein the thrust bearing separates the drive shaft and the bearing housing, and a bearing sleeve disposed within the bearing housing, wherein a radial bearing is placed between the bearing sleeve and the drive shaft. The balancing piston includes a first and second hydrodynamic seal. The recording transducer package is self powered and gathers data from a plurality of sensors in the downhole tool. The latch rod assembly include a latch head is coupled to the rotor of a drill motor, wherein the latch head is larger than the opening in the bottom end of a top sub. |
| 主权项 |
1. A drill motor system comprising:
a seal carrier providing a seal between an end cap and a drive shaft, the seal carrier fluctuating up and down depending on pressure in a wellbore, wherein the seal carrier includes at least one seal to minimize the entry of unwanted particles, and the seal carrier defines a bottom portion of a lubrication fluid chamber; a bearing pack assembly for a drill motor, the bearing pack disposed in said lubrication fluid chamber, the bearing pack assembly comprising:
a bearing housing coupled to an end cap;the drive shaft extending into the end cap and the bearing housing; anda bearing sleeve disposed within the bearing housing, wherein a radial bearing is placed between the bearing sleeve and the drive shaft; a balancing piston disposed between the drive shaft and the bearing housing, the balancing piston fluctuating up and down depending on pressure in the wellbore, wherein the balancing piston defines a top portion of said lubrication fluid chamber, and the balancing piston comprising: a first hydrodynamic seal placed in a first groove defined by the balancing piston, wherein the first hydrodynamic seal is in contact with the drive shaft; and a second hydrodynamic seal placed in a second groove defined by the balancing piston, wherein the second hydrodynamic seal is in contact with the drive shaft; a stator, wherein a rotor is disposed within the stator; a top sub coupled to the stator, wherein a bottom end of the top sub is coupled to the stator, the bottom end provides a shoulder to reduce an opening in the bottom end of the top sub to a first internal diameter; a latch rod coupled to the rotor, wherein the latch rod is solid without a central bore, a first end of the latch rod is coupled to the rotor and the latch rod extends into the top sub, and a second diameter of said latch rod is less than said first internal diameter of the top sub to allow unobstructed fluid flow between the shoulder of said top sub and said latch rod; and a latch head coupled to a second end of the latch rod, wherein a latch head diameter is larger than the first internal diameter in the bottom end of the top sub. |
