Research On Potential Analysis And Supporting Technology Of Casing Damaged Shut-down Wells In Daqing Oil Field

Xingbei Oil Field long-term water flooding and polymer flooding development,various reservoir moisture content differences,even high containing water Wells there is also a sizeable water is low and there are a certain reserves potential of reservoir,especially the existence of oil Wells and inefficient due to oil pollution is relatively rich in residual oil.In addition,when there are plenty of well shut-in water cut is relatively high,but relative to the overall water cut oil field at high now,had to shut down the well still have considerable value for development,especially compared with the peripheral low permeability reservoir value.In addition,many of casing damage Wells casing damage location in the reservoir,near some,in the middle,the reservoir in the well to stimulation,due to factors such as the original perforating hole jam made of casing damage Wells near a large number of remaining oil cannot be produced,therefore,to the governance of casing damage close shut the well,to be able to make the production potential of the closed well put into use again,has great practical significance.At first,this paper applied potential index closed well,the production potential of shut down Wells were analyzed,and then by inefficient shut down Wells measures effect prediction model,determine the governance boundary of closing well,the cumulative oil production for the period of validity of Np,and the validity period of the lowest economic output delta Qomin compared,to control limits:when Np or delta Qomin,the well can consider governance from the Angle of economic benefits.When Np is "Qomin",the well should not be governed in terms of economic benefit.Of inefficient shut down Wells after comprehensive renovation technology research of form a complete set of research,mainly including high water-content inefficient shut down Wells modification technology research,the moisture content of different interaction supporting layer fracturing technology and water plugging technology,and the field application effect of each technology are analyzed.Finally,those who had the potential to governance inefficient shut down Wells casing damage,divided into the casing damage Wells and without plastic casing change well,corresponding modification measures are given respectively,and analyzes the scene management instance,form a complete closure of casing damage Wells.Apricot north oil field using the above technology to 58 shut down Wells governance,as of September 30,2017,the cumulative oil production of 74356.6 tons,according to the oil price of $76 a barrel,the exchange rate of 6.66 yuan/dollar terms,tons of oil cost 470 yuan/ton,tons of oil profits is 2718.8 yuan/ton,input and output than 8.997,achieved good economic benefits.