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APPROACHES TO ASSESS EFFECTIVENESS OF ASPHALTENE AND PARAFFIN SOLVENTS
Abstract
One of the most common problems reported in the mature oil-producing regions of the world, i.e. related to the fields that are in a state of declining production or reaching the end of their productive lives, is associated with organic deposits forming both in and around the wellbore. Paraffin, resin and asphaltene deposit (ARPD) has been a problem for operators in many areas since the beginning of petroleum production from wells. There is a variety of techniques and means to control these deposits, and the most popular among them in Russia is the use of chemical agents, i.e. organic solvents and aqueous solutions of different compositions. Currently, there is a number of methods to assess the effectiveness of solvents used to control asphaltene and paraffin, and, needless to say, they are not perfect. The paper discusses the potential of an integrated method developed to evaluate the effectiveness of solvents used to clean the borehole pumping equipment and choose an effective composition for removing organic deposits taking into consideration their component composition. The authors confirm that a system approach is urgently needed in industry to ensure that the proper composition is used to remove a certain asphaltene, resin or paraffin. The method has been proposed to assess the ability of different solvent compositions to dissolve organic deposits that have different chemical content and structure, location, the dynamics of the dissolution process, as well as their compatibility with oil, water oil emulsions and produced water.
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References11
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