Technique Of Nitrogen Foam Profile Control In Heavy Oil Reservoir With Edge And Bottom Water

The steam huff and puff is the main way of heavy crude oil mining in GuDao oil field.It takes tens years to make a oil field expoitation in a high velocity. The problems such as disproportionation of oil coat employing, which is made of vapor scurrying and steam overlapping,,have become the dominant factor of restraining oil field development.And the heating block of GuDao oil field is a heavy crude oil reservoir with edge water. With the production time prolonging, the edge water intrudes seriously, for which the high water cut wells grow in number,and the uppermost ones locate in Medium Two North heating block.It is indicated by home and abroad research that,the conformance and displacement efficiency will be higher when megatemperature foam system is filled with vapor. It is foaming in layer gutters when megatemperature frother and nitrogen gas are filling in. HS foam film blanks off high permeability zone or high capacity channel, which represses vapor going into high permeable bed and makes it turning to low ones. Wherefore the displacement volume includes and vapor sweep area expands and reservoir development improves.In this object, with the research of Medium Two North block development feather and water instrusion, the adapted megatemperature foaming agent is selected, whose abililty and adaptiveness and feeding parameter are optimized.The working site construction proceeds based on the research. It has been operated for 28 times, and the successful rate is 92.3%. In Medium Two North block ,10 wells have been operated in this way, each one outputs more 1473.3 ton oil in production. It can be indicated that the nitrogen gas foam assisting shifting and cutting technology is efficient for controlling edge water of heavy crude oil, and which is significant for raising recovery ratio and stable yields.