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Waste Gas Disposal

IP.com Disclosure Number: IPCOM000237683D
Publication Date: 2014-Jul-02
Document File: 1 page(s) / 19K

Publishing Venue

The IP.com Prior Art Database

Abstract

In the present state of the oil business, concern is high for environmental issues. In situations where a well is producing gas, the threshold of profitability depends on several factors including the volume of gas, the salability of the gas and the existence of a collection system. The old practice of venting or flaring the gas in many locations may now be illegal or heavily controlled. This invention concerns methods and equipment to dispose of the unprofitable gas by injecting it into candidate disposal formations. These disposal wells are typically used for the waste water that is produced with the oil. Direct injection of the gas into a disposal well would require very high pressure to overcome the formation pressure in the disposal zone. The invention is specific to injecting the gas into a pump that is being used to dispose of the waste water and having the waste water transport the entrained gas to the location of the disposal zone. This has the benefit of adding the weight of the column of fluid to the gas pressure when it arrives at the disposal zone and reducing the boost pressure that the gas would normally require. There are three separate cases defined by the volume of gas and available pressure. A simple system is for low volume of gas. Gas can be piped to the pump entrance and drawn by the natural venturi formed at the pump intake. A system with some similarities is taught in US patent #7,882,896 which pertains to removing gas from a seabed caisson pump assembly. For larger gas volumes US patent #7,997,335 teaches the use of jet pump configured within the body of the pump. Both of these methods are subject to pump performance degradation due to the gas and performance will drop as the gas volume increases. The third method accepts the reality that a centrifugal pump designed for liquid is a poor gas compressor. It parallels the centrifugal pump and injects the gas into the pump at a location where the gas is high enough to force the gas into the pump and the volume is low enough that it will not interfere significantly with the pump performance. Example with 9,000 bbl of water and 280 mcf of gas (50,000 bbl of gas at std conditions), at a pressure of 50 bar (app 750 psi) the gas occupies a volume of about 1,000 bbl. This would be injected into the centrifugal pump at a location where the liquid pressure s approaching 750 psi. The total fluid at that point would be 10,000 bpd and the gas content about 10. There would be very little pump performance degradation as the mixture continues through the pump. The Hpumps (horizontal centrifugal pumps) that we manufacture are ideal for this type of system. The number of stages in the in the pre and post injection pump sections can be easily created to produce a pump tailored to the wells requirements. The Injection section could be created as a separate bolt on piece that would provide a location for pressure taps, and a centrifugal liquid/gas mixer. Methods or modifications to the pump selection program could be developed to aid in the sizing and performance prediction of the equipment.

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Waste Gas Disposal

 

In the present state of the oil business, concern is high for environmental issues. In situations where a well is producing gas, the threshold of profitability depends on several factors including the volume of gas, the salability of the gas and the existence of a collection system. The old practice of venting or flaring the gas in many locations may now be illegal or heavily controlled. This invention concerns methods and equipment to dispose of the unprofitable gas by injecting it into candidate disposal formations. These disposal wells are typically used for the waste water that is produced with the oil. Direct injection of the gas into a disposal well would require very high pressure to overcome the formation pressure in the disposal zone. The invention is specific to injecting the gas into a pump that is being used to dispose of the waste water and having the waste water transport the entrained gas to the location of the disposal zone. This has the benefit of adding the weight of the column of fluid to the gas pressure when it arrives at the disposal zone and reducing the boost pressure that the gas would normally require.

 

   

 

   

 

               


There are three separate cases defined by the volume of gas and available pressure. A simple system is for low volume of gas. Gas can be piped to the pump entrance and drawn by the natural venturi formed at the pump intake. A system with some similarities is taught in US patent #7,882,896 which pertains to removing gas from a seabed caisson pump assembly. For larger gas volumes US patent #7,997,335 teaches the use of jet pump configured within the body of the pump. Both of these methods are subject to pump performance degradation due to the gas and p...