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Optimum matrix acidizing: How much does it impact the productivity

机译：最佳基质酸化：它会影响生产率多少

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Formation damage is one of the big challenges for oil and gas oilfields development. Several types of formation damage most likely exist during the entire life of producing wells. Formation damage can occur during the drilling or coring operations, well completion, work-over and production. The most important problems that affect formation during drilling operations are mud filtrate and fines invasion. There are different damage mechanisms affect reservoirs for instance pore blocking by solids, clay swelling and dispersion and liquid block which all reduce effective permeability to hydrocarbons. The reduction in production and an excessive build up pressure in injection wells indicate the formation. Many techniques are developed to remove the formation damage and to improve the productivity of wells. Matrix acidizing is one of these method which depend on injecting acids into the formation below fracturing pressure to eliminate the damage around the well. In this study, comprehensive design procedures for the acid treatment have been introduced. The procedures include the determination of the damage type and the mineralogy of the formation. Accordingly, the selection of the appropriate acid for the treatment and the optimum volume of injected acid are explained in the study. Additionally, the research presents several models for the pre-flush volume and the main acid volume based on the radius of the damaged zone and the height of the formation. New technique has been proposed for determining the final permeability improvement ratio based on current and proposed productivity index. It has been found the pre-flush volume increase as the carbonate percentage in the formation increases while the main acid volume conversely proportional with the clay content in the formation.
机译：地层损坏是石油和天然气油田开发的重要挑战之一。在生产井的整个寿命期间，几种类型的形成损坏很可能存在。在钻孔或芯片操作期间可能发生形成损坏，完成，重新制作和生产。在钻井作业期间影响形成的最重要问题是泥浆滤液和罚款入侵。存在不同的损伤机制影响储层例如通过固体，粘土溶胀和分散体和液体块堵塞，所有这些都可以降低碳氢化合物的有效渗透性。注射孔中生产的减少和过度的积压表示形成。开发了许多技术以消除形成损坏并提高井的生产率。基质酸化是这些方法之一，这取决于将酸注入到低于压裂压力下的地层中，以消除井周围的损坏。在这项研究中，已经引入了酸治疗的综合设计程序。该程序包括测定损伤类型和形成的矿物质。因此，在研究中解释了用于治疗的适当酸和最佳体积的选择。此外，该研究呈现了若干模型，用于基于受损区的半径和形成的高度的基于损坏区域的含量和主酸体积。提出了基于电流和提出的生产率指数确定最终渗透性提高率的新技术。已经发现，随着地层中的碳酸酯百分比增加，在形成的碳酸酯体积与形成中的粘土含量相反成比例。

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