Demonstration of Straight and Horizontal Well Distance of High Water Sandstone Oilfield
LI Ya-nan;MENG Fan-qiu;E&D Research Institute of Liaohe Oilfield Company,PetroChina;
The K oilfield of Kazakhstan has complex reservoir lithology and high heterogeneous interlayer. It was mainly developed by inverted nine-spot pattern,partially developed by inverted sevenspot and combination with four wells by water flooding for 37 years,and the comprehensive water content is 90. 5%. In order to dig the potential remaining oil and improve the degree of producing reserves,we explored the way of combination of water injection to straight direct well and oil production by horizontal well in developing the remaining oil. Then we took the application of geology,logging,reservoir engineering and many multidisciplinary theories,combined with the results of numerical simulation,then we demonstrated the percentage of producing reserve in different plane position combination and different distance of wells. The well spacing of the combination of straight and horizontal wells has large relationship with the thickness of reservoir and the location of the injector. The minimum well spacing need to be no less than 200 meters and the maximum well spacing is designed by the demarcate recovery ratio of the oilfield. It has already deployed 38 horizontal wells in the K oilfield by further argument. The average daily oil production of single well has reached 17. 9 t/d and the water content was 68. 7%. It has been proved that it is feasible to use the horizontal well and combination with straight and horizontal well in efficient development of high water content sandstone oilfield and feasible to produce the remaining oil.
【CateGory Index】： TE324