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Well heating device and method
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Gun type well casing perforator
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Gun perforator cartridge
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Bridging plug and retrieving tool therefor
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Bridging plug and setting tool therefor
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Gun unit for gun perforators
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Well packer
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Multiple ring packer
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Formation tester
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Formation testing apparatus
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Bridging plug
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Bypass packer
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Collar breaker
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Means and method of perforating deep wells
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Bottom hole gas bean
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Gun type formation tester
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Means for controlling well flow
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Cable head and method of construction
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Method of preparing oil wells for production
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Means for splitting pipe collars in situ
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