Study On The New Technology Of Preventing And Enlarging Polymer

EOR polymer flooding as a large-scale application of the current method, and achieved significant results in terms of enhanced oil recovery. In the application process, with the increasing amount of polymer injection, injection time lengthened, bottom polymer and crude oil, dirt and impurities such as inorganic constantly mixed with aggregates, most polymer injection wells have both been substantial injection pressure increasing phenomenon, polymer injection cycles, reservoir injectivity index plummeted problems have become increasingly prominent, seriously affected the development of oil fields. Plugging measures for polymer injection wells currently effective rate, plugging little effect, resulting in frequent plugging polymer injection wells, only high operating costs, there is no guarantee in accordance with the design requirements of the normal production of polymer injection. To this end, this paper SZ36-1oilfield, in the full research abroad polymer injection well plugging on the basis of the status quo, combined with the target oilfield polymer injection wells plugging measures early overview of SZ36-1oilfield polymer injection wells blockage ingredients, plugging mechanism deplugging by injection technology and a comprehensive in-depth study, carried out the following aspects:(1) SZ36-1oilfield polymer injection wells genesis of injury mechanism and blockages:reservoir characteristics and potential damage by factor analysis, polymer, and completion lavage fluid properties clog micellar complex analysis experiments, clear clogged by dissolution of the polymer is not sufficient, stranded adsorption, the solid phase into water, oil, corrosion products, and scaling factors interact to form a complex micelles, leading to a significant decline in injectivity.(2) SZ36-1oilfield polymer injection well plugging of the feasibility study: Integrated single well of history, past and previous analysis measures plugging plugging plugging agent Experimental evaluation showed that a single treatment agent or acid can only be blocked for organic or inorganic matter of complex micelles blockage plugging limited capacity, it is difficult to achieve effective plugging purposes need to develop blockage of each component polymer injection wells composite materials targeted and efficient solution blocking agent.(3) Discard the old plugging measures, focusing on solutions for complex micelles obstruction blocking studies to fully penetrate, swell and disperse the blockage, the organic and inorganic clog clog stripping as a breakthrough, to take "polymer degradation, organic dissolved inorganic acid dissolution clog "the idea of selection, two new applications developed safe and efficient organic compound plugging plugging agent:plugging agent D, plugging agent T. System degradation of the polymer micelle dispersion ability, and can effectively dissolve grease blockage in the. Experimental evaluation showed that plugging agent plugging the system has a good effect.(4)Optimized to effectively relieve blockage of inorganic acid formulations set.(5) According core flooding experiments, polymer injection wells proposed plugging the construction process, and recommended design slug scale range.(6) Field Application practice shows that the new composite plugging fluid system can effectively relieve the blockage complex micelles damage, greatly improve the ability to inject a significant rate of success rate and the effect of100%. Solve the target oilfield polymer injection wells ever application of chlorine dioxide, calcium peroxide oxidant system plugging problems of poor results for the polymer injection wells deplugging by adding a practical note, new technology, strong support for the efficient development of oil fields.