The Pore Pressure Field Research Of Daqing Saertu North2East Block

Due to the gradual deepening of the oil exploitation, the vast majority of continental oilfields have entered the high water EOR stage. for enhancing recovery and improving water flooding effect, the vast majority areas of the Daqing Oilfield have been carried out the reasonable injection and production adjustments, which would inevitably leads to a corresponding change in the injection-production ratio and changes the reservoir pressure distribution.After a relatively long development time in heterogeneous reservoir, there is a great contradiction between the layers and plane, coupled with plenty of water polymer injection, the layer pressure is gradient, which results in the internal local pressure is held back and forms a high-pressure zone, so in some areas there will be some new geological problems during drilling, which increases the difficulty of pre-drill pore-pressure prediction. Due to the mistakes of the pre-drill pore pressure prediction, it often leads to producing serious problems such as blowout. It produces great trouble to the drilling and budget. In order to ensure the safety and quality of drilling, we must accurately predict the formation pressure in drilling area and accurately describe the distribution of pore pressure field and draw visual maps of the pore pressure field, and scientifically guide the drilling. In this paper, as the multi-layer system, multi-pressure system oilfield of Daqing Saertu North2East Block for example, from the actual exploration of the block, the author systematic analyzes static and dynamic monitoring the pressure information in the study area, through the application the fine geological research of the block and according to the principles of the seepage mechanics, on the basis of the method of Eaton, the paper calculates pressure distribution and draws pressure field, thus predicts sedimentary units abnormal formation pressure and complex regional pressure. It can guide the drilling and analyze of each well and rolling forecast. It can effectively reduce the drilling difficulties and ensure the safety of drilling and prevent the tube out and improve the quality of cementing.