A New Method To Increase Oil Recovery And Decreasing GOR by Using Downhole Choke In One of Iranian Oil Reservoirs

摘要

The downhole chokes maybe set in almost any tubular string with ordinary slick line operation. It beans are made for a specific set of flow situations and are able of controlling flow potential only during steady state flow. The choke size is set according to specific information for the well. Changing flow conditions such as pressure drop and phase change require replacement to resize the choke to achieve the desired pressure drop. The chokes are wire line set, usually in a landing nipple or collar lock mandrel or slip type mandrel where no profile is available. Set depth is variable with need. Needed information to order includes: lock type and size, service (std, H2S, CO2, amine), temperature, pressure differential, production fluids (water-cut, GOR, specific gravities) and set depth. A flow regulator may be preferable to a downhole choke for achieving control of pressure and/or heat transfer to the upper annuli. Wireline conveyed, downhole chokes and pressure regulators have been used to control flow and to address other temperature and pressure problems in a number of producing environments including hydrate producing, high pressure gas wells in the Gulf of Mexico and the North Slope. Until yet, it primary use is reduction of gas production. For the first time, in this article, we utilize bottomhole choke or downhole choke in oil well to promote production conditions and reduce GOR, then enhance oil recovery. We used downhole choke in two wells at the one Iranian oil carbonate fractured reservoir in south of Iran. Result was brilliant and showed optimization API degree, controlling petroleum quality, reduction water/gas production, lower water/gas coning, decreasing and optimization GOR, increasing oil production and naturally gas lifting. It proved us that the recovery will be increased by correct using of bottom hole choke in oil reservoirs. As you can be seen, needless to say that utilization of this downhole choke on the sand face will arrive to better production condition.