Thrust Bearing Stacks

Product Details

Product Description

Product Description
SCHEDULE FOR OVERALL DIMENSION OF
SOME BEARINGS FOR SCREW DRILLING TOOLS(only parts for reference)

Model of Drilling Tools	Bearing model		Model of Drilling Tools	Bearing model
	Bearing Model	Overall Dimension		Bearing Model	Overall Dimension
LZ60	128705K	50*25*75mm	LZ172	128718EA	154*92*330mm
LZ73	128807K	60*36*91mm	LZ185	128718EK	162*90*380mm
LZ89	128708K	74*42*162mm	LZ197	128718KA	160*90*440mm
LZ95	128709K	77*45*180mm	LZ197	128718K	170*90*380mm
LZ102	128809K	85*45*220mm	LZ197	128820K	173*100*460mm
LZ105	128709K(LL)	86*46*220mm	LZ197	128819D	175*95*466mm
LZ120	128711K	98*54*240mm	LZ203	128720KAI	174*100*656mm
LZ120	128711K(LL)	100*55*190mm	LZ203	128720A	176*100*400mm
LZ127	128713EB	110*65*220mm	LZ203	128820D	180*100*466mm
LZ165	128717G(LL)	144*84*308mm	LZ216	128721K	188*105*418mm
LZ165	128816KBX	145*80*347mm	LZ216	128722EB	192*110*440mm
LZ165	128717KA	145*84*357.5mm	LZ244	128724K	215*100*465mm
LZ172	128817K	150*85*375mm	LZ244	128725EA	215*125*440mm
LZ172	128718KC	152*90*433mm	LZ244	128726E	215*130*418mm
LZ172	128717KB	152*84*338.5mm	LZ286	128729K	260*145*550mm

Product Description
Mud lubricating bearings for drill motor
Whether you're drilling for oil or gas, the bearings in a mud motor at the end of a drill string have a direct impact on productivity and reliability. These mud motor bearings have to endure extreme operating conditions. In addition to severe axial and shock loads, these bearings are "lubricated" with highly abrasive mud, which for a bearing is the definition of an extreme operating condition.
The bearings in a mud motor at the end of a drill string would place a huge influence on productivity and reliability in terms of oil drilling or gas drilling.The working condition of these mud motor bearings are extremely harsh: the bearings bear heavy axial and
shock loads, and they are also exposedwith highly abrasive mud.
• Special steel 55SiMoVA for all bearing components
• Full complement bearing
• Precision matched rings
• Unique bearing design to support heavy
• axial drilling loads
Application:
Oil drilling motor
Downhole motor
Electric submersible pump
Bearing life:
250hours
Main Customers:
Oil company like:SLB,Halliburton or GE
Main application:
Downhole motor or drilling motor
Product Description
The bearings in a mud motor at the end of a drill string would place a huge influence on productivity and reliability in terms of oil
drilling or gas drilling.The working condition of these mud motor bearings are extremely harsh: the bearings bear heavy axial and
shock loads, and they are also exposedwith highly abrasive mud.
• Special steel for all bearing components
• Full complement bearing
• Precision matched rings
• Unique bearing design to support heavy
• axial drilling loads
Application
Down hole motor or drilling motor for the oil drilling industry
Bearing Assembly of Downhole Motor is used to transmit motor rotary dynamic force to the bit, meanwhile to withstand axial and radial load from drilling weight. Inside of the Bearing Assembly,Monton uses TC Radial Bearing and a stacked thrust bearings. The thrust bearings support the downward force resulting from the “weight on bit” (WOB) and the loads from the combination of hydraulic thrust and weight loads from internal components.Monton provides different bearing assemblies, designed to meet the diverse requirements of the drilling industry.
Downhole drilling motor bearings
Whether you’re drilling for oil or gas, the bearings in a mud motor at the end of a drill string have a direct impact on productivity and reliability.These mud motor bearings have to endure extreme operating conditions. In addition to severe axial and shock loads, these bearings are “lubricated” with highly abrasive mud, which for a bearing is the definition of an extreme operating condition.
How the new bearing works ?
The typical mud motor bearing contains between 8 and 12 rows for design optimization. When the bearing is new, the majority of the load is accommodated by the first four or five rows. As each row starts to wear, the load is shifted to the next row and the next until all the rows are worn equally. Then, the load is shifted back to the first row and the process is repeated. This unique Monton design enables the bearing to last significantly longer than previous bearing designs.
About the redesign process
To significantly improve bearing performance and reliability,Monton engineers used proprietary Monton design and simulation tools to
• accurately define the behaviour of a bearing stack
• redesign the bearing to minimize stresses and optimise load carrying capacity
• test new designs and materials. With the Monton virtual test rig, engineers were able to identify and correct the problem of cracked rings and sheared balls – two common problems with these bearing
Bearing Assembly of Downhole Motor is used to transmit motor rotary dynamic force to the bit, meanwhile to withstand axial and radial load from drilling weight. Inside of the Bearing Assembly, montonuses TC Radial Bearing and a stacked thrust bearings. The thrust bearings support the downward force resulting from the “weight on bit” (WOB) and the loads from the combination of hydraulic thrust and weight loads from internal components.montonprovides different bearing assemblies, designed to meet the diverse requirements of the drilling industry.
1) Bit nozzle pressure loss is 7.0 Mpa, montonuses a stacked multiple balls design for the thrust bearings. The thrust bearings support the downward force resulting from the “weight on bit” (WOB) and the loads from the combination of hydraulic thrust and weight loads from internal components.
Rolling Element Bearings (Ball Bearings)
Rolling element bearings, or ball bearings, have conventionally been used to react thrust, or axial, loads in downhole mud motors. When low rpm power sections are used in the application such bearings provide suffcient life and reliability. However, bearing component fatigue causes life to decrease linearly as speed increases; fatigue makes ball bearings unsuitable for high rpm motors. In addition to life, friction and horse-power losses are often of interest in drilling. Ball bearings are referred to as frictionless bearings due to the rolling nature of the elements; however in practice frictional losses exist duo to rolling resistance and sliding. An order of magnitude approximation of the coefficition of friction (CoF) for an angular contact bearing operation in ideal non-abrasive lubricant conditions is 0.0032. In drilling mud, the CoF can be assumed to be significantly higher.
2) Bit nozzle pressure loss is 14.0 Mpa, montonuses PDC thrust bearings or Hydronamic bearings . It has longer life and higher bearing loading capacity.
Sliding Bearings (PDC Bearings)
Polycrystalline Diamond Compact (PDC) bearings have historically been utilized in high speed motors as they are not subjected to the same fatigue mechanism experienced by rolling element bearings. These bearings operate in a sliding manner and relative moving parts to transmit load. Common PDC bearings designs use an array of round PDC pads mounted to a ring.
In the case of PDC the value of coefficient of friction (CoF) can be estimated by 0.05 to 0.08.
Hydrodynamic Bearings
Hydrodynamic, or fluid-film, bearings function by separating the bearing faces by a layer of visious fluid. A conventional hydrodynamic tilt-pad bearing was modified for use in downhole operation. The modification includes the use of spring mounted silicon carbide pads which:
- allow pads to tilt for fluid entrainment into the bearings surface
- allow deflection in the axial direction for efficiently sharing thrust load among pads and between stacked bearings
- resist mud abrasion due to hardness of the advanced ceramic
The coefficient of friction (CoF) for the hydrodynamic bearing operation in water can be estimated to be 0.0004.
Customer benefits
• Improved wear-resistance
• Increased load carrying capacity
• Optimized load distribution
• Increased robustness
• Improved reliability
• Customized design

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