| This topic originates from the Liao Xing oil and gas development company, selection of low permeability fractured reservoir in Shu2-5-11four four fault blocks (Shu51fault block, Shu2-4-013fault block, DU129fault block, Shu2-5-11fault block) in2-5-11fault block as a test well group, the test well group in oilfield, north of block2-5-11, well group plane contradiction is more outstanding, the reservoir is low permeability fractured reservoir. Low permeability fractured reservoir exploitation difficulty big, low waterflooding efficiency, high speed, high efficiency and how to develop low permeability fractured reservoir is the goal of Petroleum Science and technology workers.Discussed at the fractured low permeability reservoir development present situation, profile control, profile control agent technology development status, profile control agent for oil displacement mechanism research, analyzes the development of low permeable fractured reservoirs characteristics (injected water along the fracture flow, water cut increasing fast; oil well and water injection results obvious directions of water injection well; injection pressure, low water absorption ability), puts forward the low permeable fractured reservoirs and Countermeasures (advanced water injection, water injection cycle technology, acid fracturing, water injection technology, profile control and water shutoff technology), demonstrates the profile control technology (weak gel profile control and flooding technique for heavy oil thermal recovery well, high temperature profile control technology in deep well and super deep well, water plugging and profile control technology of polymer flooding reservoir, profile control and water shutoff technology, horizontal well water plugging technology for water control and other) can improve the low permeability reservoir development status.Through the discussion of domestic oil field research and application of profile control and water shutoff technology has experienced three stages of development (mechanical, chemical agents, single well profile control with integral comprehensive management stage), analysis of profile control technology development trend (economically and effectively expand the water plugging and profile control of industrial scale, continuous innovation to improve the economic benefit and efficiency, develop cutting-edge technology and strengthen domestic and international technology exchange and technical coordination), profile control technology to classify (colloidal dispersion gel profile control technique, weak gel profile control technique, microbial deep profile control technology, Precrosslinked particle profile control technique) and its characteristics and advantages are analyzed, expounds the development and application of profile control agent (polymer gel plugging agent, copolymer plugging agent, modified starch, sodium silicate, profile control agent, aldehyde resin, cement, biological polymer), made clear the profile control agent of oil displacement profile control mechanism (the mechanism is based on the formation of blocking agent for selective access to the theory, when plugging agent is pumped into the injection wells, it gives priority to the formation of high permeability zone, and after a predetermined time period to generate gel or solid precipitation, to enter the plugging agent layer production Blocking effect, the whole reservoir permeability tend consistent, injected water flow pattern and flow change of medium and low permeability layers, thereby increasing the swept volume of injected water, enhanced oil recovery).The purpose and significance of the research:according to SHU2-5-11fault block of Liaohe Oilfield, geological characteristics, through indoor physical simulation experiment and choose the reasonable profile control system, in order to solve the low permeability fractured reservoir, low yield of injected flooding system ineffective circulation problems and provide technical preparation. Laboratory evaluation and field test can be through understanding the adaptation this segment block profile control system performance, such as low permeability fractured reservoir to stabilize oil production and control water, improve the ultimate recovery rate and low permeability oilfield overall development level has important theoretical and practical significance.In Shu2-5-11actual oilfield development demand, in this paper, through indoor physical simulation, for profile control agent filtration and its performance evaluation, study of ultra high polymer, polymer and a crosslinking agent of organic chromium in different mixture ratio under conditions of gelation and zeolite profile control characteristics were evaluated. Optimization of the gelling property and liquid carrying capacity good profile control system according to the actual situation of oilfield, and for profile control agent slug design. Through the indoor experiment evaluation of polymer, ultra high molecular weight polymer and crosslinking agent concentration ratio of chromium in different conditions of gelation condition, optimized for the adjustment of low permeability fractured reservoir fluid entry profile of the profile control system. Based on zeolite profile control technology in the important role, mainly introduces the basic properties of (zeolite ion exchange, adsorption properties, catalytic properties, thermal stability, acid resistance) and physical properties (and rock pore structure matching relationship, zeolite particle and pore size, pore size and its compatibility with compatibility, particle size transmission and steering ability), and zeolite carrying fluid optimization design (polymer concentration and particle matching, carrying liquid stability and shear test) and profile control agent injection section design and effect prediction of profile control agent (design, profile control agent slug design, injection rate, injection pressure and displacement of design, design profile control agent preparation and injection device).Through field test, profile control after injected volume increases dramatically, injection pressure is stable, profile control well production well by cumulative fluid volume rose, water content decreased obviously, profile saw significant effect. According to the profile before and after the entry profile data and production data shows that optimal profile control system has a good effect of profile control, and the use of measuring and adjusting technology on the profile control effect was verified. |
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