Water Flooding Fine Tap Study In The N District At Saertu

After more than 40 years exploration in the N district at S oil field, it has entered into extra high water cut later stage at present. South eight district has implemented well pattern infilling for three times. The baKIc well pattern and infilled well pattern are both participated in the development work at the same time. At this stage, The compoKIte water content of production well has reached as high as 93.16%,and the degree of reserve recovery has reached 53.74%.The remaining oil has a great potential. So the N district can be conducted water flooding fine tap LIng to tap the remaining oil that is remained in the reservoir.At present, the N district has entered into extra high water cut later stage. With the rise of the water content, the distribution of remaining oil turns to highly dispersed and local relatively concentrated and large discontinuous areas. Therefore, the old reservoir description method and the preciKIon to understand the formation structure have been far been from meeting the development requirements of the stage. It requires more precise, more accurate and quantitative reservoir description method.This paper is based on the contradiction between existing well network and layers. First of all, we restudy the fault in the formation with the reservoir description technology which takes the combination of well and seismic as the core, so as to improve the understanding degree of fault distribution, and to determine the formation interrupt layer features. And the structural characteristics of the strata are analyzed by using the combination of well and seismic, and the technology of sedimentary micro facies under the combination of well and seismic is studied.Secondly, based on the the combination of well and seismic data fine seismic interpretation, we establish the 3D geological model of the formation. And we study the remaining oil distribution and the distribution characteristics by establishing the numerical simulation model. We respectively study the he plane and vertical distribution rules of remaining oil, so as to provide the basis for behind the measures for tapping potential of remaining oil. According to the characteristics of the geological features of reservoirs and the three-dimensional geological model, we analyse of factors influencing the accuracy of quantitative to quantify the size of the remaining oil potential.Then, on the basis of determining the distribution law of the remaining oil, we finely adjust the the injection production structure of the block especially high water cut stage. In view of the characteristics of the two types of reservoir, the well pattern reconstruction technique is adopted. Three types of reservoirs belong to the category of low permeability reservoirs, and the reasonable injection production well spacing is studied. Considering the feasibility of tertiary oil recovery in the future, without disturbing the existing well pattern deployment and the pattern of the main exploration object, and based on the pattern of relatively independent and complete, The corresponding holes were made for the secondary and tertiary infill wells to manage the inefficient wells and to achieve the goal of improving the employ situation of thin and poor reservoir.Finally, according to the situation that ayer and well network have become perfect in almost after several adjustments, we research and improve the extra high water cut period interval segmentation and matching technology of tapping, realizes the multi well network under the condition of high-quality note of fine injection production structure adjustment after completing the block injection production relationship adjustment.