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Cylinder liner is one of the main wear parts of drilling mud pump, which is often caused by serious abrasive wear and erosion wear to increase the inner diameter, and gradually form a large gap with the piston, resulting in mud leakage and pump pressure drop. At present, most of the cylinder liners used in oil fields are bimetal cylinder liners, although its inner layer is made of high chromium cast iron with high wear-resistant coating, but the service life is only 400~600 hours, and about 4500 pieces are consumed in Liaohe oilfield alone every year. The potential of expensive high chromium cast iron materials has not been fully realized. In the spirit of increasing revenue and saving expenditure, we have been carrying out trial repair of the scrapped cylinder liner of the 3NB-800 pump since February 1988. For example, its inner diameters of 130 mm and 140 mm were changed to 140 mm and 150 mm respectively. A total of 300 liners have been repaired and tried to be used in the Liaohe oilfield. The trial results show that its life span is as much as 500 hours, This is equivalent to the service life of a new liner, while the repair cost is only 50% of the price of a new liner. At present, there are four kinds of cylinder liners 130, 140, 150 and 160 mm commonly used in Liaohe Oilfield, and there is a high chromium cast iron with a thickness of 6 ~ 8 mm on the inner diameter surface. Usually, after the inner diameter is worn by 0.5~0.8mm, the cylinder liner fails. From this, it is possible to explore the potential of high-chromium cast iron and transform the obsolete cylinder liners into new cylinder liners with a larger inner diameter, as following; 1. Preparation before repair ( 1 ) Carefully select those centrifugally poured high chromium cast iron layers with uniform thickness from the waste cylinder liners, and in the inner diameter reprocessing and reheat treatment, it is possible to meet the requirements of technical conditions as repair objects. ( 2 ) Seal the repaired cylinder liner for cleaning, and use sandpaper or wire brush to remove rust spots and dirt on the inner and outer surfaces. ( 3 ) According to the technical requirements, repair welding is carried out on the defective parts of the outer surface and end of the cylinder liner. 2. Repair procedure There are two types of repair processes, one is to machine after heat treatment, and the other is to machine directly without heat treatment. (A) Method of machining after heat treatment (1) Select 130, 140, 150 mm cylinder liners with a layer thickness of 6~8 mm and place them in the furnace for protection annealing. When annealing, the cylinder liner should be placed upright in the heating furnace, and its stop end should be up. The hardness after annealing should be HRC 30~35. (2) After annealing, the machining process is carried out according to the inner diameter size requirements of the "new cylinder liner", and the grinding amount is left (the usual grinding allowance is 0.4 mm. (3) Protective quenching after machining processing, tempering should be carried out immediately after quenching, and the time of intermediate parking should not exceed 24 hours. The hardness after tempering should reach HRC60~64. (3) The inner diameter of the cylinder liner after tempering is ground and honed to meet the requirements of the drawing. (B) Method of direct machining without heat treatment The cylinder liner that has undergone hardness test of HRC60 or more is directly turned by special tools, and the cutting speed is controlled during procedure: At 10~20 meters per minute, the passing amount is 0.3~0.6 mm per revolution, the cutting depth is 0.5~1.0 mm, and the grinding amount is left. Its inner diameter is finally ground and honed to meet the requirements of the drawing. The cylinder liner repaired by the above method should be painted and oiled after passing the inspection according to the technical requirement, and packaged for later use.

Introduction   In the world of oilfield drilling mud pump, innovation never stops. One such innovation that has been making waves is the use of bimetal mud pump liners.    What Are Bimetal Mud Pump Liners?   Bimetal or bimetallic mud pump liners are currently the most widely used and one of the most used mud pump fluid end parts. It is tightly integrated by two layers, the inner sleeve and outer shell. The outer shell forging is wear-resistant and adopts centrifugal casting technology, inner sleeve is high chromium wear and corrosion resistance, heat treated to 62 HRC. The production of bimetal liners in our company strictly controls the tolerance range to ensure easy installation. The inner sleeve is with high finish, wear resistance, corrosion resistance, long service life, suitable for a variety of harsh working environments. Outer shell: 45# forged steel, tensile strength σb>610MPa, yield strength σs>450MPa, elongation §>17%, Hardness HB180-200. Inner sleeve: high chromium cast iron (centrifugal casting), annealing hardness HRC≤40, quenching hardness HRC60-67.   Benefits of Bimetallic Liners   1. Enhanced Wear Resistance: The inner sleeve of bimetallic cylinder liners is specifically chosen for its resistance to wear and abrasion. This means that the liners can withstand the high-friction environments, leading to longer service life.   2. Economic: Bimetallic cylinder liners have a lower procurement price compared to ceramic or zirconia type liner.   3. Corrosion Resistance: Many bimetallic liners feature an outer shell that is highly corrosion-resistant, ensuring longevity even in harsh operating conditions.   4. Reduced Downtime: Thanks to their durability, bimetallic liners lead to reduced downtime for maintenance and replacements, keeping drilling mud pump unit operational for longer periods.     Conclusion   The adoption of bimetallic cylinder liners represents a significant leap in the world of drilling mud pump. Their ability to combine the strength of steel with superior wear resistance makes them an attractive choice for a wide range of applications. As technology continues to advance, we can expect bimetallic cylinder liners to play an increasingly crucial role in enhancing the efficiency and longevity of mud pump industries.