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97085 ELASTOMERS IN MUD MOTORS FOR OIL FIELD APPLICATIONS

Picture for 97085 ELASTOMERS IN MUD MOTORS FOR
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Product Number: 51300-97085-SG
ISBN: 97085 1997 CP
Author: Hendrik John
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Mud motore the most frequently used downhole drilling motors in modern drilling systems are described in their application and function. The elastomeric liner in a mud motor acta as a huge continuous seal. Important properties of elastomers such as chemical resistance, fatigue resistance, mechanical strength, abrasion resistance, bonding to steel and processability are discussed. Advantages and disadvantages of NBR, HNBR, FKM, TFEP, and EPDM elastomers for mud motor application are briefly described. The importance of drilling fluids and their physical and chemical impact on motor elastomers are described. Drilling fluids are categorized in: oil based-, synthetic-, and water based. Results of compatibility tests in the different drilling muds of the presented categories demonstrate the complexity of elastomer development. Elastomers with an equally good performance in all drilling muds are not available. Future developments and improvements are directed towards higher chemical resistance at higher service temperature. This will be possible only with improved elastomer -to- metal bonding, increased mechanical and better dynamic properties. Keywords: mud motor, oilfield, elastomer, chemical resistance, mechanical properties, NBR, HNBR, FKM, TFEP, EPDM, drilling fluids, oil based mud, synthetic based mud, water based mud, elastomer-to-metal bonding
Mud motore the most frequently used downhole drilling motors in modern drilling systems are described in their application and function. The elastomeric liner in a mud motor acta as a huge continuous seal. Important properties of elastomers such as chemical resistance, fatigue resistance, mechanical strength, abrasion resistance, bonding to steel and processability are discussed. Advantages and disadvantages of NBR, HNBR, FKM, TFEP, and EPDM elastomers for mud motor application are briefly described. The importance of drilling fluids and their physical and chemical impact on motor elastomers are described. Drilling fluids are categorized in: oil based-, synthetic-, and water based. Results of compatibility tests in the different drilling muds of the presented categories demonstrate the complexity of elastomer development. Elastomers with an equally good performance in all drilling muds are not available. Future developments and improvements are directed towards higher chemical resistance at higher service temperature. This will be possible only with improved elastomer -to- metal bonding, increased mechanical and better dynamic properties. Keywords: mud motor, oilfield, elastomer, chemical resistance, mechanical properties, NBR, HNBR, FKM, TFEP, EPDM, drilling fluids, oil based mud, synthetic based mud, water based mud, elastomer-to-metal bonding
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