Study On Improving Development Effect Of AT1 Block Triassic Bottom Water Condensate Gas Reservoir

The Trias of ATI block in Tahe oilfield, Oil group of condensate gas reservoir is located in the south of Tahe oilfield.Then it is structurally located at the south slope of Akekule salient in Shaya uplift in Tarim basin and belongs to bottom water, faulted-anticline, moderate porosity and high permeability,ordinary temperatures and pressures, condensate gas reservoir with bottom oil. ATI blocks of condensate gas reservoir with bottom water bottom oil, has a certain particularity, mainly including water complex, fluid phase state and complex relationship of oil and gas, fluid seepage characteristics of complex and so on. As the bottom oil into gas in the process of mining belt are hard to produced and lost, and the corresponding mining is difficult.At present, AT1block trias oil group condensate gas reservoir has been in high water-cut stage, wells of low production and inefficiency in this block are becoming more and the producing reserves extent is poor. As for the present development situation and the technical problems, this paper studies the remaining oil and gas distribution by the analysis of the development characteristics and the combination of the dynamic and static data. Depending on the type of research at home and abroad related with oil and gas field development experience, the author lays stress on analyzing the dominant factors influencing the block development effect. On the basis of the studies development effect of the block, This paper studies to determine the block major means of next exploration by the research of the blocks to improve development effect of technology. And then use Fine gas reservoir description——development characteristics and the status of the water and edge-bottom water intrusion pattern development dynamic analysis——numerical simulation of gas reservoir trace evaluation method. Geological characteristics, rhythm, structure and fracture characteristics of Triassic formation of ATI block medium oil group were deeply research. As well as the combination of static and dynamic data of ATI block medium oil group development characteristics, watered-out conditions, the way edge-bottom water intrusion and residual oil and gas distribution characteristics were studied. And the development characteristics of block (watered-out mode, water invasion characteristics, water influx)were analyzed. The effect interlayer on the bottom water coning and residual oil and gas distribution were studied by using the numerical simulation method, and the residual oil and gas distribution characteristics of Triassic formation of ATI block medium oil group has been clear about. Based on this, factors which may influence the developing effect have been further analyzed. Meanwhile, by comparing with the existing effective developing technologies, technologies of covering the remaining reserves of this block have been studied. Thus, a series of technologies have been identified including general oil-based plugging agent in horizontal wells and perforation adding plus layer adjustment which utilizes heterogeneity of interlayers in horizontal sections and the rhythm sections,which have been proved to achieve good results in preliminary application of the field.Finally, the covery enhancing technologies of Triassic formation in AT1block was summarized and the followings can be got:(1) The development practice experience of the same kind of reservoir at home and abroad were summarized,and we draw the suggestion that AT1blocks are available for gas injection development for improving the overall oil recovery;(2) By studying the block of residual oil and gas, well pattern control and residual oil and gas rich areas can be newly demonstrated;(3) A series of technologies which have been formed in the process of covering the remaining reservers are creative, including general oil-based plugging agent in horizontal wells and perforation adding plus layer adjustment improvement which utilizes heterogeneity of interlayers in horizontal sections and the rhythm sections, which can be a reference and guidance to the development of similar reservoirs.Meanwhile, it is suggested to promote these technologies in this block.