Research On Interwell Tracer Technology For Daqing Oil Field Region D

Most of the water injection development oil field of our country has been in the late stage of development, water cut rate is as high as 90%. Effect of development of Daqing oilfield seven plant development at present shows some problems, part of the block has too many low yield wells, residence area, and surface mining is not balanced, low producing degree of reserves, bad measures performance. Some blocks had problems like injection pressure grew fast, part of wells is of high water cut after the operation after oil production immediately, and more water breakthrough wells with the fast water cut rising.Tracer test technology is a way to know reservoir heterogeneity. Through the interwell tracer technology, and the observation of the tracer in the production well production performance, such as the breakthrough time of tracer in the production well, peak size and number, the corresponding amount of injected fluid and produced tracer number, then we can be qualitatively determine the formation of high permeable zone, large pores, nature fractures, artificial fracture and gas channeling, sealing faults, closed interlayer exists or not, But also under article quantitatively calculate high permeability, MacroPore path and natural fissures, fractures, air channeling of formation parameters, such as thickness, permeability, high permeability and pore radii of formation parameters,and provide the scientific basis of effect evaluation for the adjustment of development plan and profile correction and water plugging, that can guide formulation of feasible adjusting measures to improve the oil recovery rate.In view of four blocks of Daqing oilfield region D, we selected 20 wells to carry out inter well tracer test. This paper analyzed the geological characteristics and development situation of the study block, summarized the selecting principles of chemical tracer,radioactive isotope tracer,non radioactive tracer,trace the material tracer,and evaluated the performance of various types of tracer comprehensive, then chosed tracer for each well group, and determined the proper dosage. Finally, the inter well tracer test was carried out in each block. We got tracer sampling from the corresponding production and did tracer concentration detection within three months, through the analysis of tracer test results, including the tracer breakthrough time, peak time, peak value, and the duration of the peak time, we can find the faults exist or not, the connectivity between oil and water wells group, the development of sand body, the target well water inflow direction and the development of fractures. The results can put forward reasonable suggestions for the water flooding development plan adjustment of Daqing oilfield the region D.