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• W2051276394 abstract "Abstract An acid system containing effective complexing and dispersing agents has proved to be highly successful in removing wellbore damage from highly-permeable formations and naturally fractured reservoirs. Case histories are presented for many wells that failed to respond to repeated clean-up attempts with conventional systems. Treatments using conventional acid, Mud Acid and diesel oil had been tried unsuccessfully. The wells did respond however to a system that incorporated special complexing agents with surfactant dispersants. In addition to providing case histories, this paper will describe the nature of the special agents and their action and offer a possible explanation for their downhole performance. One of the most difficult wellbore clean-up problems is encountered in gravel-packed wells. Sand movement and production must be controlled by gravel packing in many of the highly permeable formations in the Gulf Coast area. These gravel packs present an added barrier to overcome when bringing mud and solids back into the wellbore. Lost drilling mud, in particular, is difficult to flow through a gravel pack. The complexing-dispersing system described here has proved to be effective even under these conditions. Introduction Frequently, we become so accustomed to a problem that we do not even recognize it as being a problem. This has been the case with many wells damaged by drilling mud. Until large amounts of mud were unexpectedly brought back from these wells, no one even suspected that mud was there or it was reducing well productivity. This problem was discovered while performing a treatment using a mud and silt remover acid system (hereafter referred to as MSR). This system was developed and introduced in the Rocky Mountains area in 1978. Its success in removing drilling mud has lead to its application in areas where skin damage results from natural clays and fines that migrate toward the wellbore. The most dramatic results have been in wells where large volumes of whole mud were released following the MSR acid treatment. Good results have also been obtained without obvious mud removal occurring. The possible explanations for its down-hole performance may not be as positive as the field results. performance may not be as positive as the field results. Ne will, however, explain some of the fundamentals of this system. MSR contains both clay dispersing chemicals and iron chelating agents. Part of the silt suspending ability of MSR is due to a carefully blended surfactant mixture that is water-wetting, rather than oil-wetting. Its iron chelating capacity is much greater than most iron control acid systems. It is speculated that whole mud is lost into a natural fracture, which is opened by the hydraulic head on the formation. Once there, the mud interface nearest the wellbore becomes dehydrated, perhaps by gas flow, thus solidifying and sealing off the natural fracture. The mud is then trapped until a fluid that is capable of penetrating and dispersing the dehydrated material can penetrating and dispersing the dehydrated material can reach it. This can occur in a fracture or a large pore system, such as a vugular carbonate or a pore system, such as a vugular carbonate or a highly-permeable formation. Laboratory data for the MSR acid system have shown increased clay dispersion and iron chelating ability, as indicated in Table 1. The predominate effect of MSR acid is its ability to increase the time solids are held in suspension by the spent acid. Since gas (nitrogen usually) is used to improve the rate of return and since the wells are flowed as soon as possible following pumping, this increased suspending time can be a very big factor in the success of MSR acid. There are many highly permeable and loosely consolidated wells in the Gulf Coast area. These factors can lead to sand production unless the wells are specially treated, such as by gravel packing. Highly-permeable wells are particularly prone to accept amounts of drilling fluid resulting in skin damage and reduced productivity." @default.
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• W2051276394 date "1980-01-28" @default.
• W2051276394 modified "2023-10-14" @default.
• W2051276394 title "Removal Of Wellbore Damage From Highly Permeable Formations And Naturally Fractured Reservoirs" @default.
• W2051276394 doi "https://doi.org/10.2118/8796-ms" @default.
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