Study On The Adaptability Of Horizontal Well Technology Of Sul4Block In Sulige Gas Field

On the basis of geological modeling and sduty of effective sand body distribution lawwhich by predecessors,use the methods of numerical simulation and gas reservoirengineering, sduty the favorable geological conditions of the Su-14blocks for horizontalwells and horizontal wells deployment policy limits，provide a basis for the development ofhorizontal wells in tight gas reservoir.Firstly, demonstrate the economic policy limits of horizontal well, come to the conclusionthat when a well invest costs24million Yuan and the price of natural gas is0.8yuan, so thatthe cumulative production of a well at least up to5961.45×10~4m~3, so as to recover theinvestment and costs.Secondly,combined with the geological characteristics of Sulige gas field, systematicanalysis geological adaptability of the horizontal well, and come to the conclusionthat:First,class I, class II, class III reservoir which are classied by some standards,theireffective sand thickness must be respectively achieve at least5m,7m,12m. Second, whenthe thickness of effective sand body is8m,the area of effective sand body must be greaterthan0.35km~2、0.5km~2、1.5km~2.Third, the reservoir abundance of all the classes of reservoir must be achieve1.20×10~8m~3/km~2. Optimizing horizontal well network experiment area on the aspect of reservoirparameters、economic limit and so on, draw the conclusion that lower H8sublayer is notsuitable for horizontal wells and upper H8sublayer meet the conditions of horizontalwells.Besides, the reserves abundance of S1sublayer are very low, so the sublayer candeploy single horizontal well, but can not form a horizontal well network. On the plane,experimental target of horizontal well network area are selected in the northeast.Finally, by the tool of numerical simulation we optimized the direction of the horizontalsection should be from south to north and the length of the horizontal section shoud be1000m to1200m, the shape of the well pattern shoud be diamond shaped combination wellwith vertical and horizontal.The well spacing is800m and row spacing is1000m.Under this scheme, we can get the best development effect and the shortest payback period about wellinvestment.