Reciprocating Sliding Friction and Wear Behavior between Wellbore Cleaning Tools against Casing
According to the working conditions of oil drilling wellbore,the multifunctional integrated wellbore cleaning technology is applied to reduce the time and cost of wellbore cleaning.The tools accompanying this technology include a variety of tools,in which the scraping block rubs against rust stains on the inner wall of the wellbore casing.There are drill cuttings left by drilling,cement slag,and debris such as casing injection burrs,and the inner wall of the casing needs to be replaced frequently due to its poor abrasion resistance,which increases the time required for wellbore cleaning,and thus increases the cost and reduces the efficiency of oil recovery.Therefore,laser cladding surface treatment is conducted to improve the wear resistance of the scraping block part of the multifunctional integrated wellbore cleaning tool.Laser cladding technology is widely used in petroleum machinery to solve the corrosion and wear problems caused by corrosive gas and metal particles generated during the oil extraction process.This paper mainly compared two laser cladding technologies,laser cladding Ni55 coating and laser cladding Stellite6 coating,and commonly used wear-resistant coating preparation parameters were used for the preparation process.Multi-functional friction and wear experimental machine was used to carry out the reciprocating sliding friction and wear between casing and scraping block under the medium of well washing fluid.The friction pair was mainly selected because the scraping block and the inner wall of the casing had a long contact time,and the wear of casing was also related to the operation of the oilfield,and the serious abrasion would result in the abandonment of the oil wells.The loss of casing and scraping block was measured by spiral micrometer,electronic balance,profiler and white light interferometer.The coating structure and wear morphology were characterized by optical microscope,X-ray diffractometer and scanning electron microscope.The experimental results showed that the wear mechanism between the scraping block and the casing was mainly abrasive wear and adhesive wear.In order to minimize the loss of the casing,the best plate material should choose untreated 42CrMo and laser cladding Ni55 coating,and in order to minimize the loss of the scraping block,the optimal surface treatment process was laser cladding Ni55 coating.In summary,the best friction pair was the pin sample AISI4330V and plate sample Ni55 coating.Among them,the Stellite6 coating of higher hardness had no dense organization,and was likely to deform and break in the friction wear process,and the sub-surface layer of the carbide organization in the process of wear broken into smaller particles,which not only had no good resistance to wear,but also may further aggravate the wear as a third body abrasive grains.For the Ni55 coating of intermediate hardness,the sub-surface layer of carbide organization broken into massive particles in the wear process,and played a good carrying role in the friction wear.Therefore,in the laser cladding coating surface treatment technology,the laser cladding Ni55 coating can be an effective method to improve the wear resistance of scraper blocks.
wellbore cleaningscraper blocklaser claddingfriction and wearwear resistance
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