Research About Regulating Early-stage And High-water-cut Well In The Development Of Chang-8 Reservoir Of Xifeng

Because there exist many important problems during water flood development in Xifeng oilfield, we should research some typical reservoirs. We are based on production performance data, combined with analyzing geological log information .in Xifeng oilfield, we analyze influence factor about well's water cut increase by discerning breakthrough well direction and water breakthrough's law and studying reservoir characteristic, oil recovery technology and so on. Above the foundation of researching low permeable reservoir's seepage flow law and evaluating the technology of water flood development, we often use a plenty of field technologies of controlling water cut to stabilize oil production, such as fracture water plugging ,cyclic water flood and so on in order to do the work about overall regulation of breakthrough well. At the same time, we analyze the effort of analysis and evaluation all the time. At last, we advance a variety of rational controlling water cut to stabilize oil production's program about block network.(1)We decide to further study geological feature about chang-8 reservoir of Xifeng oilfield by oilfield basic geologic, electrical survey and development performance data, combined with lab assay analysis. At present, to this reservoir, we have a new understand about structural feature, depositional feature, facies belt distribution, reservoir feature, reservoir control factor and so on.(2)We analyze oilfield water breakthrough law depending on water flood development and the change of water-cut in Xifeng oilfield. We also analyze influence factor of oilfield water cut from fracture pattern, reservoir heterogeneity and so on. In the field, we enforce many technologies about water breakthrough direction recognition, such as interwell tracer, pulse testing, dynamic check and fracture test. What's more, we have done the applicability evaluation about many kinds of recognition technologies.(3)We study low permeable reservoir's seepage flow law by the method of factor analysis and experimental simulation, with the purpose of looking for rational mathematical represent about physical analogue law during the seepage flow. We get start-up pressure gradient by binomial from regression, lab core seepage test, fluid-solid coupling test and dealing with experimental data. Then, we make a study about the law and quantification of start-up pressure gradient.(4)Combined with development performance feature, we make a study about low permeable reservoir water flood development technology in Xifeng oilfield by the conventional method of reservoir engineering and the technology of reservoir numerical simulation. We have analyzed the method of identifying rational well spacing density. On the foundation of economic analysis, we have compared and evaluated three kinds of methods(rectangular, square reverse nine-spot and rhombus reverse nine-spot) about pattern arrangement and pattern modification. We have analyzed and evaluated present spacing pattern's injection-production pressure systems about Xifeng oilfield, then provided the method of identifying rational injection-production development technology parameters. As to Xifeng oilfield, we have analyzed and evaluated field's effort about the technology of water flood in advance development. We have done the optimal combination about water injection timing in advance, water injection intensity in advance and water injection in advance.(5)In Xifeng oilfield, we make a measure about technology of high-water well's overall regulation. As to the block which often runs into the water, we do the flood pattern modification by using water plugging and profile control, cyclic water flooding, injection-production control and so on. Now, we have got a satisfactory adjusting result. Combined with field's implementation effort, we do the applicability evaluation about overall regulation technologies which are often seen all over the world.