Geological Modeling And Adjustment And Designation For Development Plan Of Gaotaizi Group In Longhupao Oilfield

The geological condition of the Daqing western area which is located in the northern part of Songliao Basin is complex and the type of the reservoir is mostly as "low-yield, low permeability, low abundance configuration, fault, lithologic composite reservoir. Longhupao oilfield is a typical three low Oilfield,is located in central tectonic depression of Songliao Basin Qijia- Gulong sag west side and is Longhupao- Honggang terrace near the northern end of a north-south axis of the three minor anticlines. After years of underground mining, the effect of mining original wells gradually deteriorated. Because it is difficult to establish an effective network of well flooding under the present conditions of low permeability oilfield and the poor efficiency of original well development, reservoir description research becomes extremely important in Longhupao Gaotaizi. In order to ensure rational development of late effects, it is necessary to study the reasonable comprehensive adjustment technology, provide the basis for post-scale applications.This paper is based on petroleum geology,reservior sedimentology, reservoir description, petroleum engineering and several other geological branches.With the help of drilling data,well logging data,mud logging data,analysis of test data and production data, reservoir geological modeling for Longhupao oilfield Gaotaizi GⅢ1-GⅢ9 oil group,we make fine reservoir description for Gaotaizi group and analysize the structural characteristics, the sand body characteristics and physical properties of the area.We make numerical reservoir simulation for the whole region and single wells of Gaotaizi group in Longhupao oilfield.The numerical simulation results show that the fitting results of the original well water flooding is rather good, average error rate of the oil fitting results is 10.1% and the error rate of fitting sample is 14.6%. Through the analysis of the physical property,the remaining oil distribution and recovery degree of the several layers by geological model, we have designed three infill wells; By the analysis of infill wells injection mode before and after water brekthrough, different water injection project has little effect on the cumulative oil production before water brekthrough and plan 1 is slightly better than the other programs; cumulative oil production of different water injection project is substantially the same after water brekthrough,but plan 1 is slightly better than the other programs.Through the simulation of 16 plans under different water injection and different well networks,we conclude that water injection mode of plan 1 is the best and the explanatory effect is the best in 2014 in Longhupao Oilfield. By August 2024, the total cumulative oil production is 100,000 tons and the calculated recovery degree is 6.43%.By the simulation of the original wells and infill wells, the cumulative oil production is 69,700 tons with the original wells by August 2024,while after the deployment of the infill wells, the cumulative oil production is 100,000 tons which has an increase of 43.5%,proving that under the new infill wells network conditions, the oil production oilfield of Gaotaizi group reservoir in Longhupao oilfield has been greatly improved.